import Promise from 'pouchdb-promise';
import toPromise from './toPromise';
import getArguments from 'argsarray';
import debug from 'debug';
var log = debug('pouchdb:api');

function adapterFun(name, callback) {
  function logApiCall(self, name, args) {
    /* istanbul ignore if */
    if (log.enabled) {
      var logArgs = [self.name, name];
      for (var i = 0; i < args.length - 1; i++) {
        logArgs.push(args[i]);
      }
      log.apply(null, logArgs);

      // override the callback itself to log the response
      var origCallback = args[args.length - 1];
      args[args.length - 1] = function (err, res) {
        var responseArgs = [self.name, name];
        responseArgs = responseArgs.concat(
          err ? ['error', err] : ['success', res]
        );
        log.apply(null, responseArgs);
        origCallback(err, res);
      };
    }
  }

  return toPromise(getArguments(function (args) {
    if (this._closed) {
      return Promise.reject(new Error('database is closed'));
    }
    if (this._destroyed) {
      return Promise.reject(new Error('database is destroyed'));
    }
    var self = this;
    logApiCall(self, name, args);
    if (!this.taskqueue.isReady) {
      return new Promise(function (fulfill, reject) {
        self.taskqueue.addTask(function (failed) {
          if (failed) {
            reject(failed);
          } else {
            fulfill(self[name].apply(self, args));
          }
        });
      });
    }
    return callback.apply(this, args);
  }));
}

export default adapterFun;