/**
 * Service for building strings, with wildcards replaced with metadata.
 */
angular.module('quay').factory('StringBuilderService', ['$sce', 'UtilService', function($sce, UtilService) {
  var stringBuilderService = {};

  stringBuilderService.buildUrl = function(value_or_func, metadata) {
    var url = value_or_func;
    if (typeof url != 'string') {
      url = url(metadata);
    }

    // Find the variables to be replaced.
    var varNames = [];
    for (var i = 0; i < url.length; ++i) {
      var c = url[i];
      if (c == '{') {
        for (var j = i + 1; j < url.length; ++j) {
          var d = url[j];
          if (d == '}') {
            varNames.push(url.substring(i + 1, j));
            i = j;
            break;
          }
        }
      }
    }

    // Replace all variables found.
    for (var i = 0; i < varNames.length; ++i) {
      var varName = varNames[i];
      if (!metadata[varName]) {
        return null;
      }

      url = url.replace('{' + varName + '}', metadata[varName]);
    }

    return url;
  };

  stringBuilderService.buildString = function(value_or_func, metadata) {
     var fieldIcons = {
      'inviter': 'user',
      'username': 'user',
      'user': 'user',
      'email': 'envelope',
      'activating_username': 'user',
      'delegate_user': 'user',
      'delegate_team': 'group',
      'team': 'group',
      'token': 'key',
      'repo': 'hdd-o',
      'robot': 'wrench',
      'tag': 'tag',
      'role': 'th-large',
      'original_role': 'th-large',
      'application_name': 'cloud',
      'image': 'archive',
      'original_image': 'archive',
      'client_id': 'chain'
    };

    var filters = {
      'obj': function(value) {
        if (!value) { return []; }
        return Object.getOwnPropertyNames(value);
      },

      'updated_tags': function(value) {
        if (!value) { return []; }
        return Object.getOwnPropertyNames(value);
      }
    };

    var description = value_or_func;
    if (typeof description != 'string') {
      description = description(metadata);
    }

    for (var key in metadata) {
      if (metadata.hasOwnProperty(key)) {
        var value = metadata[key] != null ? metadata[key] : '(Unknown)';
        if (filters[key]) {
          value = filters[key](value);
        }

        if (Array.isArray(value)) {
          value = value.join(', ');
        }

        value = value.toString();

        if (key.indexOf('image') >= 0) {
          value = value.substr(0, 12);
        }

        var safe = UtilService.escapeHtmlString(value);
        var markedDown = UtilService.getMarkedDown(value);
        markedDown = markedDown.substr('<p>'.length, markedDown.length - '<p></p>'.length);

        var icon = fieldIcons[key];
        if (icon) {
          markedDown = '<i class="fa fa-' + icon + '"></i>' + markedDown;
        }

        description = description.replace('{' + key + '}', '<code title="' + safe  + '">' + markedDown + '</code>');
      }
    }
    return $sce.trustAsHtml(description.replace('\n', '<br>'));
  };

  return stringBuilderService;
}]);