angular.module('portainer.services')
.factory('ImageService', ['$q', 'Image', 'ImageHelper', 'RegistryService', 'HttpRequestHelper', 'ContainerService', function ImageServiceFactory($q, Image, ImageHelper, RegistryService, HttpRequestHelper, ContainerService) {
  'use strict';
  var service = {};

  service.image = function(imageId) {
    var deferred = $q.defer();
    Image.get({id: imageId}).$promise
    .then(function success(data) {
      if (data.message) {
        deferred.reject({ msg: data.message });
      } else {
        var image = new ImageDetailsViewModel(data);
        deferred.resolve(image);
      }
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to retrieve image details', err: err });
    });
    return deferred.promise;
  };

  service.images = function(withUsage) {
    var deferred = $q.defer();

    $q.all({
      containers: withUsage ? ContainerService.containers(1) : [],
      images: Image.query({}).$promise
    })
    .then(function success(data) {
      var containers = data.containers;

      var images = data.images.map(function(item) {
        item.ContainerCount = 0;
        for (var i = 0; i < containers.length; i++) {
          var container = containers[i];
          if (container.ImageID === item.Id) {
            item.ContainerCount++;
          }
        }
        return new ImageViewModel(item);
      });

      deferred.resolve(images);
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to retrieve images', err: err });
    });
    return deferred.promise;
  };

  service.history = function(imageId) {
    var deferred = $q.defer();
    Image.history({id: imageId}).$promise
    .then(function success(data) {
      if (data.message) {
        deferred.reject({ msg: data.message });
      } else {
        var layers = [];
        angular.forEach(data, function(imageLayer) {
          layers.push(new ImageLayerViewModel(imageLayer));
        });
        deferred.resolve(layers);
      }
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to retrieve image details', err: err });
    });
    return deferred.promise;
  };

  service.pushImage = function(tag, registry) {
    var deferred = $q.defer();

    var authenticationDetails = registry.Authentication ? RegistryService.encodedCredentials(registry) : '';
    HttpRequestHelper.setRegistryAuthenticationHeader(authenticationDetails);
    Image.push({tag: tag}).$promise
    .then(function success(data) {
      if (data[data.length - 1].error) {
        deferred.reject({ msg: data[data.length - 1].error });
      } else {
        deferred.resolve();
      }
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to push image tag', err: err });
    });
    return deferred.promise;
  };

  function pullImageAndIgnoreErrors(imageConfiguration) {
    var deferred = $q.defer();

    Image.create({}, imageConfiguration).$promise
    .finally(function final() {
      deferred.resolve();
    });

    return deferred.promise;
  }

  function pullImageAndAcknowledgeErrors(imageConfiguration) {
    var deferred = $q.defer();

    Image.create({}, imageConfiguration).$promise
    .then(function success(data) {
      var err = data.length > 0 && data[data.length - 1].hasOwnProperty('message');
      if (err) {
        var detail = data[data.length - 1];
        deferred.reject({ msg: detail.message });
      } else {
        deferred.resolve(data);
      }
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to pull image', err: err });
    });

    return deferred.promise;
  }

  service.pullImage = function(image, registry, ignoreErrors) {
    var imageDetails = ImageHelper.extractImageAndRegistryFromRepository(image);
    var imageConfiguration = ImageHelper.createImageConfigForContainer(imageDetails.image, registry.URL);
    var authenticationDetails = registry.Authentication ? RegistryService.encodedCredentials(registry) : '';
    HttpRequestHelper.setRegistryAuthenticationHeader(authenticationDetails);

    if (ignoreErrors) {
      return pullImageAndIgnoreErrors(imageConfiguration);
    }
    return pullImageAndAcknowledgeErrors(imageConfiguration);
  };

  service.tagImage = function(id, image, registry) {
    var imageConfig = ImageHelper.createImageConfigForCommit(image, registry);
    return Image.tag({id: id, tag: imageConfig.tag, repo: imageConfig.repo}).$promise;
  };

  service.deleteImage = function(id, forceRemoval) {
    var deferred = $q.defer();
    Image.remove({id: id, force: forceRemoval}).$promise
    .then(function success(data) {
      if (data[0].message) {
        deferred.reject({ msg: data[0].message });
      } else {
        deferred.resolve();
      }
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to remove image', err: err });
    });
    return deferred.promise;
  };

  return service;
}]);