package org.gitlab4j.api;

import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;

import javax.ws.rs.core.Form;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;

import org.gitlab4j.api.models.Comment;
import org.gitlab4j.api.models.Commit;
import org.gitlab4j.api.models.CommitAction;
import org.gitlab4j.api.models.CommitAction.Action;
import org.gitlab4j.api.models.CommitPayload;
import org.gitlab4j.api.models.CommitRef;
import org.gitlab4j.api.models.CommitRef.RefType;
import org.gitlab4j.api.models.CommitStatus;
import org.gitlab4j.api.models.CommitStatusFilter;
import org.gitlab4j.api.models.Diff;
import org.gitlab4j.api.models.GpgSignature;
import org.gitlab4j.api.models.MergeRequest;
import org.gitlab4j.api.utils.ISO8601;

/**
 * This class implements the client side API for the GitLab commits calls.
 * See <a href="https://docs.gitlab.com/ce/api/commits.html">Commits API at GitLab</a> for more information.
 */
public class CommitsApi extends AbstractApi {

    public CommitsApi(GitLabApi gitLabApi) {
        super(gitLabApi);
    }

    /**
     * Get a list of all repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @return a list containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Commit> getCommits(Object projectIdOrPath) throws GitLabApiException {
        return (getCommits(projectIdOrPath, null, null, null, null, true, null, null, getDefaultPerPage()).all());
    }

    /**
     * Get a list of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param page the page to get
     * @param perPage the number of commits per page
     * @return a list containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @deprecated
     */
    @Deprecated
    public List<Commit> getCommits(Object projectIdOrPath, int page, int perPage) throws GitLabApiException {
        return (getCommits(projectIdOrPath, null, null, null, page, perPage));
    }

    /**
     * Get a Pager of all repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @return a Pager containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<Commit> getCommits(Object projectIdOrPath, int itemsPerPage) throws GitLabApiException {
        return (getCommits(projectIdOrPath, null, null, null, null, true, null, null, itemsPerPage));
    }

    /**
     * Get a Stream of all repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @return a Stream containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<Commit> getCommitStream(Object projectIdOrPath) throws GitLabApiException {
        return (getCommits(projectIdOrPath, null, null, null,null, true, null, null, getDefaultPerPage()).stream());
    }

    /**
     * Get a list of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param path the path to file of a project
     * @return a list containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until, String path) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, path, null, null, null, getDefaultPerPage()).all());
    }

    /**
     * Get a list of file commits in a project
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits?path=:file_path</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param path the path to file of a project
     * @return a list containing the commits for the specified project ID and file
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Commit> getCommits(Object projectIdOrPath, String ref, String path) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, null, null, path, null, null, null, getDefaultPerPage()).all());
    }

    /**
     * Get a list of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @return a list containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, null, null, null, null, getDefaultPerPage()).all());
    }

    /**
     * Get a list of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param page the page to get
     * @param perPage the number of commits per page
     * @return a list containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @deprecated
     */
    @Deprecated
    public List<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until, int page, int perPage) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, null, page, perPage));
    }

    /**
     * Get a Stream of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @return a Stream containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<Commit> getCommitsStream(Object projectIdOrPath, String ref, Date since, Date until) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, null, null, null, null, getDefaultPerPage()).stream());
    }

    /**
     * Get a Stream of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param path the path to file of a project
     * @return a Stream containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<Commit> getCommitsStream(Object projectIdOrPath, String ref, Date since, Date until, String path) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, path, null, null, null, getDefaultPerPage()).stream());
    }

    /**
     * Get a list of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param path the path to file of a project
     * @param page the page to get
     * @param perPage the number of commits per page
     * @return a list containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @deprecated
     */
    @Deprecated
    public List<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until, String path, int page, int perPage) throws GitLabApiException {
        Form formData = new GitLabApiForm()
                .withParam("ref_name", ref)
                .withParam("since", ISO8601.toString(since, false))
                .withParam("until", ISO8601.toString(until, false))
                .withParam("path", (path == null ? null : urlEncode(path)))
                .withParam(PAGE_PARAM,  page)
                .withParam(PER_PAGE_PARAM, perPage);
        Response response = get(Response.Status.OK, formData.asMap(), "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits");
        return (response.readEntity(new GenericType<List<Commit>>() {}));
    }

    /**
     * Get a Pager of repository commits in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @return a Pager containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until, int itemsPerPage) throws GitLabApiException {
        return getCommits(projectIdOrPath, ref, since, until, null, null, null, null, itemsPerPage);
    }

    /**
     * Get a Pager of repository commits in a project
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @param path the path to file of a project
     * @return a Pager containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until, String path, int itemsPerPage) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, path, null, null, null, itemsPerPage));
    }

    /**
     * Get a List of the specified repository commits in a project
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param path the path to file of a project
     * @param all retrieve every commit from the repository
     * @param withStats stats about each commit will be added to the response
     * @param firstParent follow only the first parent commit upon seeing a merge commit
     * @return a Pager containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until,
            String path, Boolean all, Boolean withStats, Boolean firstParent) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, path, all, withStats, firstParent, getDefaultPerPage()).all());
    }

    /**
     * Get a Pager of the specified repository commits in a project
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param path the path to file of a project
     * @param all retrieve every commit from the repository
     * @param withStats stats about each commit will be added to the response
     * @param firstParent follow only the first parent commit upon seeing a merge commit
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @return a Pager containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until,
            String path, Boolean all, Boolean withStats, Boolean firstParent, int itemsPerPage) throws GitLabApiException {
        Form formData = new GitLabApiForm()
                .withParam("ref_name", ref)
                .withParam("since", ISO8601.toString(since, false))
                .withParam("until", ISO8601.toString(until, false))
                .withParam("path", (path == null ? null : urlEncode(path)))
                .withParam("all", all)
                .withParam("with_stats", withStats)
                .withParam("first_parent", firstParent);
        return (new Pager<Commit>(this, Commit.class, itemsPerPage, formData.asMap(),  "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits"));
    }

    /**
     * Get a Stream of the specified repository commits in a project
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param ref the name of a repository branch or tag or if not given the default branch
     * @param since only commits after or on this date will be returned
     * @param until only commits before or on this date will be returned
     * @param path the path to file of a project
     * @param all retrieve every commit from the repository
     * @param withStats stats about each commit will be added to the response
     * @param firstParent follow only the first parent commit upon seeing a merge commit
     * @return a Stream containing the commits for the specified project ID
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<Commit> getCommitsStream(Object projectIdOrPath, String ref, Date since, Date until,
            String path, Boolean all, Boolean withStats, Boolean firstParent) throws GitLabApiException {
        return (getCommits(projectIdOrPath, ref, since, until, path, all, withStats, firstParent, getDefaultPerPage()).stream());
    }

    /**
     * Get a specific commit identified by the commit hash or name of a branch or tag.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return the Commit instance for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Commit getCommit(Object projectIdOrPath, String sha) throws GitLabApiException {
        Response response = get(Response.Status.OK, getDefaultPerPageParam(), "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", urlEncode(sha));
        return (response.readEntity(Commit.class));
    }

    /**
     * Get a specific commit identified by the commit hash or name of a branch or tag as an Optional instance
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return the Commit for the specified project ID/sha pair as an Optional instance
     */
    public Optional<Commit> getOptionalCommit(Object projectIdOrPath, String sha) {
        try {
            return (Optional.ofNullable(getCommit(projectIdOrPath, sha)));
        } catch (GitLabApiException glae) {
            return (GitLabApi.createOptionalFromException(glae));
        }
    }

    /**
     * Get a List of all references (from branches or tags) a commit is pushed to.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/refs</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return a List of all references (from branches or tags) a commit is pushed to
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @since Gitlab 10.6
     */
    public List<CommitRef> getCommitRefs(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getCommitRefs(projectIdOrPath, sha, RefType.ALL, getDefaultPerPage()).all());
    }

    /**
     * Get a Pager of references (from branches or tags) a commit is pushed to.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/refs?type=:refType</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @return a Pager of references (from branches or tags) a commit is pushed to
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @since Gitlab 10.6
     */
    public Pager<CommitRef> getCommitRefs(Object projectIdOrPath, String sha, int itemsPerPage) throws GitLabApiException {
        return (getCommitRefs(projectIdOrPath, sha, RefType.ALL, itemsPerPage));
    }

    /**
     * Get a Stream of all references (from branches or tags) a commit is pushed to.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/refs</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return a Stream of all references (from branches or tags) a commit is pushed to
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @since Gitlab 10.6
     */
    public Stream<CommitRef> getCommitRefsStream(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getCommitRefs(projectIdOrPath, sha, RefType.ALL, getDefaultPerPage()).stream());
    }

    /**
     * Get a List of all references (from branches or tags) a commit is pushed to.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/refs?type=:refType</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param refType the scope of commits. Possible values branch, tag, all. Default is all.
     * @return a List of all references (from branches or tags) a commit is pushed to
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @since Gitlab 10.6
     */
    public List<CommitRef> getCommitRefs(Object projectIdOrPath, String sha, RefType refType) throws GitLabApiException {
        return (getCommitRefs(projectIdOrPath, sha, refType, getDefaultPerPage()).all());
    }

    /**
     * Get a Pager of references (from branches or tags) a commit is pushed to.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/refs?type=:refType</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param refType the scope of commits. Possible values branch, tag, all. Default is all.
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @return a Pager of references (from branches or tags) a commit is pushed to
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @since Gitlab 10.6
     */
    public Pager<CommitRef> getCommitRefs(Object projectIdOrPath, String sha, CommitRef.RefType refType, int itemsPerPage) throws GitLabApiException {
        Form form = new GitLabApiForm().withParam("type", refType);
        return (new Pager<CommitRef>(this, CommitRef.class, itemsPerPage, form.asMap(),  "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", urlEncode(sha), "refs"));
    }

    /**
     * Get a Stream of all references (from branches or tags) a commit is pushed to.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/refs?type=:refType</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param refType the scope of commits. Possible values branch, tag, all. Default is all.
     * @return a Stream of all references (from branches or tags) a commit is pushed to
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     * @since Gitlab 10.6
     */
    public Stream<CommitRef> getCommitRefsStream(Object projectIdOrPath, String sha, RefType refType) throws GitLabApiException {
        return (getCommitRefs(projectIdOrPath, sha, refType, getDefaultPerPage()).stream());
    }

    /**
     * Get a list of repository commit statuses that meet the provided filter.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/statuses</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA
     * @param filter the commit statuses file, contains ref, stage, name, all
     * @return a List containing the commit statuses for the specified project and sha that meet the provided filter
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<CommitStatus> getCommitStatuses(Object projectIdOrPath, String sha, CommitStatusFilter filter) throws GitLabApiException {
        return (getCommitStatuses(projectIdOrPath, sha, filter, getDefaultPerPage()).all());
    }

    /**
     * Get a list of repository commit statuses that meet the provided filter.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/statuses</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA
     * @param filter the commit statuses file, contains ref, stage, name, all
     * @param page the page to get
     * @param perPage the number of commits statuses per page
     * @return a List containing the commit statuses for the specified project and sha that meet the provided filter
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<CommitStatus> getCommitStatuses(Object projectIdOrPath, String sha,
            CommitStatusFilter filter, int page, int perPage) throws GitLabApiException {

        if (projectIdOrPath == null) {
            throw new RuntimeException("projectIdOrPath cannot be null");
        }

        if (sha == null || sha.trim().isEmpty()) {
            throw new RuntimeException("sha cannot be null");
        }

        MultivaluedMap<String, String> queryParams = (filter != null ?
                filter.getQueryParams(page, perPage).asMap() : getPageQueryParams(page, perPage));
        Response response = get(Response.Status.OK, queryParams, 
                "projects", this.getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "statuses");
        return (response.readEntity(new GenericType<List<CommitStatus>>() {}));
    }

    /**
     * Get a Pager of repository commit statuses that meet the provided filter.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/statuses</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA
     * @param filter the commit statuses file, contains ref, stage, name, all
     * @param itemsPerPage the number of CommitStatus instances that will be fetched per page
     * @return a Pager containing the commit statuses for the specified project and sha that meet the provided filter
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<CommitStatus> getCommitStatuses(Object projectIdOrPath, String sha, 
            CommitStatusFilter filter, int itemsPerPage) throws GitLabApiException {

        if (projectIdOrPath == null) {
            throw new RuntimeException("projectIdOrPath cannot be null");
        }

        if (sha == null || sha.trim().isEmpty()) {
            throw new RuntimeException("sha cannot be null");
        }

        MultivaluedMap<String, String> queryParams = (filter != null ? filter.getQueryParams().asMap() : null);
        return (new Pager<CommitStatus>(this, CommitStatus.class, itemsPerPage, queryParams,
                "projects", this.getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "statuses"));
    }

    /**
     * Get a Stream of repository commit statuses that meet the provided filter.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/statuses</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA
     * @param filter the commit statuses file, contains ref, stage, name, all
     * @return a Stream containing the commit statuses for the specified project and sha that meet the provided filter
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<CommitStatus> getCommitStatusesStream(Object projectIdOrPath, String sha, CommitStatusFilter filter) throws GitLabApiException {
        return (getCommitStatuses(projectIdOrPath, sha, filter, getDefaultPerPage()).stream());
    }

    /**
     * <p>Add or update the build status of a commit.  The following fluent methods are available on the
     * CommitStatus instance for setting up the status:</p>
     * <pre><code>
     * withCoverage(Float)
     * withDescription(String)
     * withName(String)
     * withRef(String)
     * withTargetUrl(String)
     * </code></pre>
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/statuses/:sha</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance (required)
     * @param sha a commit SHA (required)
     * @param state the state of the status. Can be one of the following: PENDING, RUNNING, SUCCESS, FAILED, CANCELED (required)
     * @param status the CommitSatus instance hoilding the optional parms: ref, name, target_url, description, and coverage
     * @return a CommitStatus instance with the updated info
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public CommitStatus addCommitStatus(Object projectIdOrPath, String sha, CommitBuildState state, CommitStatus status) throws GitLabApiException {

        if (projectIdOrPath == null) {
            throw new RuntimeException("projectIdOrPath cannot be null");
        }

        if (sha == null || sha.trim().isEmpty()) {
            throw new RuntimeException("sha cannot be null");
        }

        GitLabApiForm formData = new GitLabApiForm().withParam("state", state, true);
        if (status != null) {
            formData.withParam("ref", status.getRef())
                .withParam("name", status.getName())
                .withParam("target_url", status.getTargetUrl())
                .withParam("description", status.getDescription())
                .withParam("coverage", status.getCoverage());
        }

        Response response = post(Response.Status.OK, formData, "projects", getProjectIdOrPath(projectIdOrPath), "statuses", sha);
        return (response.readEntity(CommitStatus.class));
    }

    /**
     * Get the list of diffs of a commit in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/diff</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return a List of Diff instances for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Diff> getDiff(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getDiff(projectIdOrPath, sha, getDefaultPerPage()).all());
    }

    /**
      * Get the Pager of diffs of a commit in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/diff</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param itemsPerPage the number of Diff instances that will be fetched per page
     * @return a Pager of Diff instances for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<Diff> getDiff(Object projectIdOrPath, String sha, int itemsPerPage) throws GitLabApiException {

        if (projectIdOrPath == null) {
            throw new RuntimeException("projectIdOrPath cannot be null");
        }

        if (sha == null || sha.trim().isEmpty()) {
            throw new RuntimeException("sha cannot be null");
        }

        return (new Pager<Diff>(this, Diff.class, itemsPerPage, null,
            "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "diff"));
    }

    /**
      * Get the Diff of diffs of a commit in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/diff</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return a Stream of Diff instances for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<Diff> getDiffStream(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getDiff(projectIdOrPath, sha, getDefaultPerPage()).stream());
    }

    /**
     * Get the comments of a commit in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/comments</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return a List of Comment instances for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<Comment> getComments(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getComments(projectIdOrPath, sha, getDefaultPerPage()).all());
    }

    /**
     * Get a Pager of the comments of a commit in a project.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/comments</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param itemsPerPage the number of Comment instances that will be fetched per page
     * @return a List of Comment instances for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<Comment> getComments(Object projectIdOrPath, String sha, int itemsPerPage) throws GitLabApiException {
        return new Pager<Comment>(this, Comment.class, itemsPerPage, null, "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "comments");
    }

    /**
     * Get the comments of a commit in a project as a Stream.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/comments</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return a Stream of Comment instances for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<Comment> getCommentsStream(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getComments(projectIdOrPath, sha, getDefaultPerPage()).stream());
    }

    /**
     * Add a comment to a commit.  In order to post a comment in a particular line of a particular file,
     * you must specify the full commit SHA, the path, the line and lineType should be NEW.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits/:sha/comments</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param note the text of the comment, required
     * @param path the file path relative to the repository, optional
     * @param line the line number where the comment should be placed, optional
     * @param lineType the line type, optional
     * @return a Comment instance for the posted comment
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Comment addComment(Object projectIdOrPath, String sha, String note, String path, Integer line, LineType lineType) throws GitLabApiException {
        GitLabApiForm formData = new GitLabApiForm()
                .withParam("note", note, true)
                .withParam("path", path)
                .withParam("line", line)
                .withParam("line_type", lineType);
        Response response = post(Response.Status.CREATED, formData, "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "comments");
        return (response.readEntity(Comment.class));
    }

    /**
     * Add a comment to a commit.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits/:sha/comments</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @param note the text of the comment, required
     * @return a Comment instance for the posted comment
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Comment addComment(Object projectIdOrPath, String sha, String note) throws GitLabApiException {
        return (addComment(projectIdOrPath, sha, note, null, null, null));
    }

    /**
     * Create a commit with single file and action.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param branch tame of the branch to commit into. To create a new branch, also provide startBranch
     * @param commitMessage the commit message
     * @param startBranch the name of the branch to start the new commit from
     * @param authorEmail the commit author's email address
     * @param authorName the commit author's name
     * @param action the CommitAction to commit
     * @return the created Commit instance
     * @throws GitLabApiException if any exception occurs during execution
     */
    public Commit createCommit(Object projectIdOrPath, String branch, String commitMessage, String startBranch,
            String authorEmail, String authorName, CommitAction action) throws GitLabApiException {

        // Validate the action
        if (action == null) {
            throw new GitLabApiException("action cannot be null or empty.");
        }

        return (createCommit(projectIdOrPath, branch, commitMessage, startBranch,
                authorEmail, authorName, Arrays.asList(action)));
    }

    /**
     * Create a commit with multiple files and actions.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param branch tame of the branch to commit into. To create a new branch, also provide startBranch
     * @param commitMessage the commit message
     * @param startBranch the name of the branch to start the new commit from
     * @param authorEmail the commit author's email address
     * @param authorName the commit author's name
     * @param actions the array of CommitAction to commit as a batch
     * @return the created Commit instance
     * @throws GitLabApiException if any exception occurs during execution
     */
    public Commit createCommit(Object projectIdOrPath, String branch, String commitMessage, String startBranch,
            String authorEmail, String authorName, List<CommitAction> actions) throws GitLabApiException {

        CommitPayload payload = new CommitPayload()
                .withBranch(branch)
                .withStartBranch(startBranch)
                .withCommitMessage(commitMessage)
                .withAuthorEmail(authorEmail)
                .withAuthorName(authorName)
                .withActions(actions);
        return (createCommit(projectIdOrPath, payload));
    }

    /**
     * Create a commit with multiple files and actions.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param payload a CommitPayload instance holding the parameters for the commit
     * @return the created Commit instance
     * @throws GitLabApiException if any exception occurs during execution
     */
    public Commit createCommit(Object projectIdOrPath, CommitPayload payload) throws GitLabApiException {

        // Validate the actions
	List<CommitAction> actions = payload.getActions();
        if (actions == null || actions.isEmpty()) {
            throw new GitLabApiException("actions cannot be null or empty.");
        }

        for (CommitAction action : actions) {

            // File content is required for create and update
            Action actionType = action.getAction();
            if (actionType == Action.CREATE || actionType == Action.UPDATE) {
                String content = action.getContent();
                if (content == null) {
                    throw new GitLabApiException("Content cannot be null for create or update actions.");
                }
            }
        }

        if (payload.getStartProject() != null) {
            payload.setStartProject(getProjectIdOrPath(payload.getStartProject()));
        }

        Response response = post(Response.Status.CREATED, payload,
                "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits");
        return (response.readEntity(Commit.class));
    }

    /**
     * Reverts a commit in a given branch.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits/:sha/revert</code></pre>
     *
     * @since GitLab 11.5
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA to revert
     * @param branch the target branch to revert the commit on
     * @return a Commit instance holding the reverted commit
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Commit revertCommit(Object projectIdOrPath, String sha, String branch) throws GitLabApiException {
        GitLabApiForm formData = new GitLabApiForm().withParam("branch", branch, true);
        Response response = post(Response.Status.CREATED, formData,
                "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "revert");
        return (response.readEntity(Commit.class));
    }
    
    /**
     * Cherry picks a commit in a given branch.
     *
     * <pre><code>GitLab Endpoint: POST /projects/:id/repository/commits/:sha/cherry_pick</code></pre>
     *
     * @since GitLab 8.15
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA to cherry pick
     * @param branch the target branch to cherry pick the commit on
     * @return a Commit instance holding the cherry picked commit
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Commit cherryPickCommit(Object projectIdOrPath, String sha, String branch) throws GitLabApiException {
        GitLabApiForm formData = new GitLabApiForm().withParam("branch", branch, true);
        Response response = post(Response.Status.CREATED, formData,
                "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", sha, "cherry_pick");
        return (response.readEntity(Commit.class));
    }

    /**
     * Get a list of Merge Requests related to the specified commit.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/merge_requests</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA to get merge requests for
     * @return a list containing the MergeRequest instances for the specified project/SHA
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public List<MergeRequest> getMergeRequests(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getMergeRequests(projectIdOrPath, sha, getDefaultPerPage()).all());
    }

    /**
     * Get a Pager of Merge Requests related to the specified commit.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/merge_requests</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA to get merge requests for
     * @param itemsPerPage the number of Commit instances that will be fetched per page
     * @return a Pager containing the MergeRequest instances for the specified project/SHA
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Pager<MergeRequest> getMergeRequests(Object projectIdOrPath, String sha, int itemsPerPage) throws GitLabApiException {
	return (new Pager<MergeRequest>(this, MergeRequest.class, itemsPerPage, null,
                "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", urlEncode(sha), "merge_requests"));
    }

    /**
     * Get a Stream of Merge Requests related to the specified commit.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/merge_requests</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha the commit SHA to get merge requests for
     * @return a Stream containing the MergeRequest instances for the specified project/SHA
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public Stream<MergeRequest> getMergeRequestsStream(Object projectIdOrPath, String sha) throws GitLabApiException {
        return (getMergeRequests(projectIdOrPath, sha, getDefaultPerPage()).stream());
    }

    /**
     * Get the GPG signature from a commit, if it is signed. For unsigned commits, it results in a 404 response.
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/signature</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return the GpgSignature instance for the specified project ID/sha pair
     * @throws GitLabApiException GitLabApiException if any exception occurs during execution
     */
    public GpgSignature getGpgSignature(Object projectIdOrPath, String sha) throws GitLabApiException {
        Response response = get(Response.Status.OK, getDefaultPerPageParam(),
        	"projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits", urlEncode(sha), "signature");
        return (response.readEntity(GpgSignature.class));
    }

    /**
     * Get the GPG signature from a commit as an Optional instance
     *
     * <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits/:sha/signature</code></pre>
     *
     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
     * @param sha a commit hash or name of a branch or tag
     * @return the GpgSignature for the specified project ID/sha pair as an Optional instance
     */
    public Optional<GpgSignature> getOptionalGpgSignature(Object projectIdOrPath, String sha) {
        try {
            return (Optional.ofNullable(getGpgSignature(projectIdOrPath, sha)));
        } catch (GitLabApiException glae) {
            return (GitLabApi.createOptionalFromException(glae));
        }
    }
}