/* exported Script */

String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
}

const getLabelsField = (labels) => {
  let labelsArray = [];
  labels.forEach(function(label) {
    labelsArray.push(label.name);
  });
  labelsArray = labelsArray.join(', ');
  return {
    title: 'Labels',
    value: labelsArray,
    short: labelsArray.length <= 40
  };
};

const githubEvents = {
  ping(request) {
    return {
      content: {
        text: '_' + request.content.hook.id + '_\n' + ':thumbsup: ' + request.content.zen
      }
    };
  },

  /* NEW OR MODIFY ISSUE */
  issues(request) {
    const user = request.content.sender;

    if (request.content.action == "opened" || request.content.action == "reopened" || request.content.action == "edited") {
        var body = request.content.issue.body;
    } else if (request.content.action == "labeled") {
        var body = "Current labels: " + getLabelsField(request.content.issue.labels).value;
    } else if (request.content.action == "assigned" || request.content.action == "unassigned") {
        // Note that the issues API only gives you one assignee.
        var body = "Current assignee: " + request.content.issue.assignee.login;
    } else if (request.content.action == "closed") {
        if (request.content.issue.closed_by) {
            var body = "Closed by: " + request.content.issue.closed_by.login;
        } else {
            var body = "Closed.";
        }
    } else {
        return {
          error: {
            success: false,
            message: 'Unsupported issue action'
          }
        };
    }

    const action = request.content.action.capitalizeFirstLetter();

    const text = '_' + request.content.repository.full_name + '_\n' +
                '**[' + action + ' issue ​#' + request.content.issue.number +
                ' - ' + request.content.issue.title + '](' +
                request.content.issue.html_url + ')**\n\n' +
                body;

    return {
      content: {
        attachments: [
            {
                thumb_url: user.avatar_url,
                text: text,
                fields: []
            }
        ]
      }
    };
  },

  /* COMMENT ON EXISTING ISSUE */
  issue_comment(request) {
    const user = request.content.comment.user;

    if (request.content.action == "edited") {
        var action = "Edited comment ";
    } else {
        var action = "Comment "
    }

    const text = '_' + request.content.repository.full_name + '_\n' +
                '**[' + action + ' on issue ​#' + request.content.issue.number +
                ' - ' + request.content.issue.title + '](' +
                request.content.comment.html_url + ')**\n\n' +
                request.content.comment.body;

    return {
      content: {
        attachments: [
            {
                thumb_url: user.avatar_url,
                text: text,
                fields: []
            }
        ]
      }
    };
  },

 /* COMMENT ON COMMIT */
commit_comment(request) {
    const user = request.content.comment.user;

    if (request.content.action == "edited") {
        var action = "Edited comment ";
    } else {
        var action = "Comment "
    }

    const text = '_' + request.content.repository.full_name + '_\n' +
                '**[' + action + ' on commit id ' + request.content.comment.commit_id +
                ' - ' +  + '](' +
                request.content.comment.html_url + ')**\n\n' +
                request.content.comment.body;

    return {
      content: {
        attachments: [
            {
                thumb_url: user.avatar_url,
                text: text,
                fields: []
            }
        ]
      }
    };
  },
  /* END OF COMMENT ON COMMIT */

  /* PUSH TO REPO */
  push(request) {
    var commits = request.content.commits;
    var multi_commit = ""
    var is_short = true;
    var changeset = 'Changeset';
    if ( commits.length > 1 ) {
      var multi_commit = " [Multiple Commits]";
      var is_short = false;
      var changeset = changeset + 's';
      var output = [];
    }
    const user = request.content.sender;

    var text = '**Pushed to ' + "["+request.content.repository.full_name+"]("+request.content.repository.url+"):"
                + request.content.ref.split('/').pop() + "**\n\n";

    for (var i = 0; i < commits.length; i++) {
      var commit = commits[i];
      var shortID = commit.id.substring(0,7);
      var a = '[' + shortID + '](' + commit.url + ') - ' + commit.message;
      if ( commits.length > 1 ) {
        output.push( a );
      } else {
        var output = a;
      }
    }

    if (commits.length > 1) {
      text += output.reverse().join('\n');
    } else {
      text += output;
    }

    return {
      content: {
        attachments: [
            {
                thumb_url: user.avatar_url,
                text: text,
                fields: []
            }
        ]
      }
    };
  },  // End GitHub Push

  /* NEW PULL REQUEST */
  pull_request(request) {
    const user = request.content.sender;

   if (request.content.action == "opened" || request.content.action == "reopened" || request.content.action == "edited" || request.content.action == "synchronize") {
        var body = request.content.pull_request.body;
    } else if (request.content.action == "labeled") {
        var body = "Current labels: " + getLabelsField(request.content.pull_request.labels).value;
    } else if (request.content.action == "assigned" || request.content.action == "unassigned") {
        // Note that the issues API only gives you one assignee.
        var body = "Current assignee: " + request.content.pull_request.assignee.login;
    } else if (request.content.action == "closed") {
        if (request.content.pull_request.merged) {
            var body = "Merged by: " + request.content.pull_request.merged_by.login;
        } else {
            var body = "Closed.";
        }
    } else {
        return {
          error: {
            success: false,
            message: 'Unsupported pull request action'
          }
        };
    }

    const action = request.content.action.capitalizeFirstLetter();

    const text = '_' + request.content.repository.full_name + '_\n' +
                '**[' + action + ' pull request ​#' + request.content.pull_request.number +
                ' - ' + request.content.pull_request.title + '](' +
                request.content.pull_request.html_url + ')**\n\n' +
                body;

    return {
      content: {
        attachments: [
            {
                thumb_url: user.avatar_url,
                text: text,
                fields: []
            }
        ]
      }
    };
  },
};

class Script {
  process_incoming_request({ request }) {
    const header = request.headers['x-github-event'];
    if (githubEvents[header]) {
      return githubEvents[header](request);
    }

    return {
      error: {
        success: false,
        message: 'Unsupported method'
      }
    };
  }
}