//-- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2014 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
//++

// TODO move to UI components
module.exports = function(PathHelper, WorkPackagesHelper, UserService){
  return {
    restrict: 'EA',
    replace: true,
    scope: {
      workPackage: '=',
      column: '=',
      displayType: '@',
      displayEmpty: '@'
    },
    templateUrl: '/templates/work_packages/work_package_column.html',
    link: function(scope, element, attributes) {
      scope.displayType = scope.displayType || 'text';

      // Set text to be displayed
      scope.$watch(dataAvailable, setColumnData);

      // Check if the data is available on the work package

      function dataAvailable() {
        if (!scope.workPackage) return false;

        if (scope.column.custom_field) {
          return customValueAvailable();
        } else {
          return scope.workPackage.hasOwnProperty(scope.column.name);
        }
      }

      function customValueAvailable() {
        var customFieldId = scope.column.custom_field.id;

        return scope.workPackage.custom_values &&
          scope.workPackage.custom_values.filter(function(customValue){
            return customValue && customValue.custom_field_id === customFieldId;
          }).length;
      }

      // Write column data to the scope

      function setColumnData() {
        setDisplayText(getFormattedColumnValue());

        if (scope.column.meta_data.link.display) {
          displayDataAsLink(WorkPackagesHelper.getColumnDataId(scope.workPackage, scope.column));
        } else {
          setCustomDisplayType();
        }
      }

      function getFormattedColumnValue() {
        // retrieve column value from work package
        if (scope.column.custom_field) {
          var custom_field = scope.column.custom_field;
          return WorkPackagesHelper.getFormattedCustomValue(scope.workPackage, custom_field);
        } else {
          return WorkPackagesHelper.getFormattedColumnData(scope.workPackage, scope.column);
        }
      }

      /**
       * @name setDisplayText
       * @function
       *
       * @description
       * Sets scope.displayText to the passed value or applies a default
       *
       * @param {String|Number} value The value for scope.displayText
       *
       * @returns null
       */
      function setDisplayText(value) {
        if (typeof value == 'number' || value){
          scope.displayText = value;
        } else {
          scope.displayText = scope.displayEmpty || '';
        }
      }

      function setCustomDisplayType() {
        if (scope.column.name === 'done_ratio') scope.displayType = 'progress_bar';
        // ...
      }

      function displayDataAsLink(id) {
        // Example of how we can look to the provided meta data to format the column
        // This relies on the meta being sent from the server
        scope.displayType = 'link';
        scope.url = getLinkFor(id, scope.column.meta_data.link);
      }

      function getLinkFor(id, link_meta){
        switch (link_meta.model_type) {
          case 'work_package':
            return PathHelper.workPackagePath(id);
          case 'user':
            if (scope.workPackage[scope.column.name] && scope.workPackage[scope.column.name].type == 'Group') {
              // if it's a group, we have nothing to link to
              scope.displayType = 'text';
              return '';
            } else {
              return PathHelper.staticUserPath(id);
            }
          case 'version':
            return PathHelper.staticVersionPath(id);
          case 'project':
            return PathHelper.staticProjectPath(id);
          default:
            return '';
        }
      }

    }
  };
};