module.exports = function(crowi, app) {
  'use strict';

  var debug = require('debug')('crowi:routes:revision')
    , Page = crowi.model('Page')
    , Revision = crowi.model('Revision')
    , ApiResponse = require('../util/apiResponse')
    , actions = {}
  ;
  actions.api = {};

  /**
   * @api {get} /revisions.get Get revision
   * @apiName GetRevision
   * @apiGroup Revision
   *
   * @apiParam {String} revision_id Revision Id.
   */
  actions.api.get = function(req, res) {
    var revisionId = req.query.revision_id;

    Revision
      .findRevision(revisionId)
      .then(function(revisionData) {
        var result = {
          revision: revisionData,
        }
        return res.json(ApiResponse.success(result));
      })
      .catch(function(err) {
        debug('Error revisios.get', err);
        return res.json(ApiResponse.error(err));
      });
  };

  /**
   * @api {get} /revisions.ids Get revision id list of the page
   * @apiName ids
   * @apiGroup Revision
   *
   * @apiParam {String} page_id      Page Id.
   */
  actions.api.ids = function(req, res) {
    var pageId = req.query.page_id || null;

    if (pageId && crowi.isPageId(pageId)) {
      Page.findPageByIdAndGrantedUser(pageId, req.user)
      .then(function(pageData) {
        debug('Page found', pageData._id, pageData.path);
        return Revision.findRevisionIdList(pageData.path);
      }).then(function(revisions) {
        return res.json(ApiResponse.success({revisions}));
      }).catch(function(err) {
        return res.json(ApiResponse.error(err));
      });
    } else {
      return res.json(ApiResponse.error('Parameter error.'));
    }
  };

  /**
   * @api {get} /revisions.list Get revisions
   * @apiName ListRevision
   * @apiGroup Revision
   *
   * @apiParam {String} revision_ids Revision Ids.
   * @apiParam {String} page_id      Page Id.
   */
  actions.api.list = function(req, res) {
    var revisionIds = (req.query.revision_ids || '').split(',');
    var pageId = req.query.page_id || null;

    if (pageId) {
      Page.findPageByIdAndGrantedUser(pageId, req.user)
      .then(function(pageData) {
        debug('Page found', pageData._id, pageData.path);
        return Revision.findRevisionList(pageData.path, {});
      }).then(function(revisions) {
        return res.json(ApiResponse.success(revisions));
      }).catch(function(err) {
        return res.json(ApiResponse.error(err));
      });
    } else if (revisionIds.length > 0) {
      Revision.findRevisions(revisionIds)
      .then(function(revisions) {
        return res.json(ApiResponse.success(revisions));
      }).catch(function(err) {
        return res.json(ApiResponse.error(err));
      });
    } else {
      return res.json(ApiResponse.error('Parameter error.'));
    }
  };

  return actions;
};