import { ajax } from 'discourse/lib/ajax';
import { hashString } from 'discourse/lib/hash';

const ADMIN_MODELS = [
  'plugin',
  'theme',
  'embeddable-host',
  'web-hook',
  'web-hook-event',
  'flagged-topic',
  'moderation-history'
];

export function Result(payload, responseJson) {
  this.payload = payload;
  this.responseJson = responseJson;
  this.target = null;
}

// We use this to make sure 404s are caught
function rethrow(error) {
  if (error.status === 404) {
    throw "404: " + error.responseText;
  }
  throw(error);
}

export default Ember.Object.extend({

  storageKey(type, findArgs, options) {
    if (options && options.cacheKey) {
      return options.cacheKey;
    }
    const hashedArgs = Math.abs(hashString(JSON.stringify(findArgs)));
    return `${type}_${hashedArgs}`;
  },

  basePath(store, type) {
    if (ADMIN_MODELS.indexOf(type.replace('_', '-')) !== -1) { return "/admin/"; }
    return "/";
  },

  appendQueryParams(path, findArgs) {
    if (findArgs) {
      if (typeof findArgs === "object") {
        const queryString = Object.keys(findArgs)
                                  .reject(k => !findArgs[k])
                                  .map(k => k + "=" + encodeURIComponent(findArgs[k]));

        if (queryString.length) {
          return path + "?" + queryString.join('&');
        }
      } else {
        // It's serializable as a string if not an object
        return path + "/" + findArgs;
      }
    }
    return path;
  },

  pathFor(store, type, findArgs) {
    let path = this.basePath(store, type, findArgs) + Ember.String.underscore(store.pluralize(type));
    return this.appendQueryParams(path, findArgs);
  },

  findAll(store, type, findArgs) {
    return ajax(this.pathFor(store, type, findArgs)).catch(rethrow);
  },


  find(store, type, findArgs) {
    return ajax(this.pathFor(store, type, findArgs)).catch(rethrow);
  },

  findStale(store, type, findArgs, options) {
    if (this.cached) {
      return this.cached[this.storageKey(type, findArgs, options)];
    }
  },

  cacheFind(store, type, findArgs, opts, hydrated) {
    this.cached = this.cached || {};
    this.cached[this.storageKey(type,findArgs,opts)] = hydrated;
  },

  jsonMode: false,

  getPayload(method, data) {
    let payload = {method, data};

    if (this.jsonMode) {
       payload.contentType = "application/json";
       payload.data = JSON.stringify(data);
    }

    return payload;
  },

  update(store, type, id, attrs) {
    const data = {};
    const typeField = Ember.String.underscore(type);
    data[typeField] = attrs;

    return ajax(this.pathFor(store, type, id), this.getPayload('PUT', data))
      .then(function(json) {
          return new Result(json[typeField], json);
      });
  },

  createRecord(store, type, attrs) {
    const data = {};
    const typeField = Ember.String.underscore(type);
    data[typeField] = attrs;
    return ajax(this.pathFor(store, type), this.getPayload('POST', data))
      .then(function (json) {
        return new Result(json[typeField], json);
       });
  },

  destroyRecord(store, type, record) {
    return ajax(this.pathFor(store, type, record.get('id')), { method: 'DELETE' });
  }

});