(function () {

'use strict';

angular.module('OpenSlidesApp.agenda', ['OpenSlidesApp.users'])

.factory('Speaker', [
    'DS',
    function(DS) {
        return DS.defineResource({
            name: 'agenda/speaker',
            relations: {
                belongsTo: {
                    'users/user': {
                        localField: 'user',
                        localKey: 'user_id',
                    }
                }
            }
        });
    }
])

.factory('AgendaUpdate',[
    'Agenda',
    'operator',
    function(Agenda, operator) {
        return {
            saveChanges: function (item_id, changes) {
                // change agenda item only if user has the permission to do that
                if (operator.hasPerms('agenda.can_manage agenda.can_see_hidden_items')) {
                    Agenda.find(item_id).then(function (item) {
                        var something = false;
                        _.each(changes, function(change) {
                            if (change.value !== item[change.key]) {
                                item[change.key] = change.value;
                                something = true;
                            }
                        });
                        if (something === true) {
                            Agenda.save(item);
                        }
                    });
                }
            }
        };
    }
])

.factory('Agenda', [
    '$http',
    'DS',
    'Speaker',
    'jsDataModel',
    'Projector',
    'gettextCatalog',
    'gettext',
    'CamelCase',
    'EditForm',
    function($http, DS, Speaker, jsDataModel, Projector, gettextCatalog, gettext, CamelCase, EditForm) {
        var name = 'agenda/item';
        return DS.defineResource({
            name: name,
            useClass: jsDataModel,
            verboseName: gettext('Agenda'),
            methods: {
                getResourceName: function () {
                    return name;
                },
                getContentObject: function () {
                    return DS.get(this.content_object.collection, this.content_object.id);
                },
                getContentObjectDetailState: function () {
                    return CamelCase(this.content_object.collection).replace('/', '.') +
                        '.detail({id: ' + this.content_object.id + '})';
                },
                getContentObjectForm: function () {
                    return EditForm.fromCollectionString(this.content_object.collection);
                },
                getContentResource: function () {
                    return DS.definitions[this.content_object.collection];
                },
                getTitle: function () {
                    var title;
                    try {
                        title =  this.getContentObject().getAgendaTitle();
                    } catch (e) {
                        // when the content object is not in the DS store.
                        title = this.title;
                    }
                    if (this.item_number) {
                        title = this.item_number + ' · ' + title;
                    }
                    return title;
                },
                getAgendaTitle: function () {
                    return this.title;
                },
                getCSVExportText: function () {
                    var text;
                    try {
                        text =  this.getContentObject().getCSVExportText();
                    } catch (e) {
                        // when the content object is not in the DS store
                        // or 'getCSVExportText' is not defined return nothing.
                    }
                    return text;
                },
                // link name which is shown in search result
                getSearchResultName: function () {
                    return this.getAgendaTitle();
                },
                // return true if a specific relation matches for given searchquery
                // (here: speakers)
                hasSearchResult: function (results) {
                    var item = this;
                    // search for speakers (check if any user.id from already found users matches)
                    return _.some(results, function(result) {
                        if (result.getResourceName() === "users/user") {
                            if (_.some(item.speakers, {'user_id': result.id})) {
                                return true;
                            }
                        }
                    });
                },
                getListViewTitle: function () {
                    var title;
                    try {
                        title =  this.getContentObject().getAgendaListViewTitle();
                    } catch (e) {
                        // when the content object is not in the DS store
                        title = this.list_view_title;
                    }
                    if (this.item_number) {
                        title = this.item_number + ' · ' + title;
                    }
                    return title;
                },
                getItemNumberWithAncestors: function (agendaId) {
                    if (!agendaId) {
                        agendaId = this.id;
                    }
                    var agendaItem = DS.get(name, agendaId);
                    if (!agendaItem) {
                        return '';
                    } else if (agendaItem.item_number) {
                        return agendaItem.item_number;
                    } else if (agendaItem.parent_id) {
                        return this.getItemNumberWithAncestors(agendaItem.parent_id);
                    } else {
                        return '';
                    }
                },
                // override project function of jsDataModel factory
                project: function (projectorId, tree) {
                    var isProjectedIds = this.isProjected(tree);
                    _.forEach(isProjectedIds, function (id) {
                        $http.post('/rest/core/projector/' + id + '/clear_elements/');
                    });
                    // Activate, if the projector_id is a new projector.
                    if (_.indexOf(isProjectedIds, projectorId) == -1) {
                        var name = tree ? 'agenda/item-list' : this.content_object.collection;
                        var id = tree ? this.id : this.content_object.id;
                        return $http.post(
                            '/rest/core/projector/' + projectorId + '/prune_elements/',
                            [{name: name, tree: tree, id: id}]
                        );
                    }
                },
                // override isProjected function of jsDataModel factory
                isProjected: function (tree) {
                    // Returns all ids of all projectors with an agenda-item element. Otherwise an empty list.
                    if (typeof tree === 'undefined') {
                        tree = false;
                    }
                    var self = this;
                    var predicate = function (element) {
                        var value;
                        if (tree) {
                            // Item tree slide for sub tree
                            value = element.name == 'agenda/item-list' &&
                                typeof element.id !== 'undefined' &&
                                element.id == self.id;
                        } else {
                            // Releated item detail slide
                            value = element.name == self.content_object.collection &&
                                typeof element.id !== 'undefined' &&
                                element.id == self.content_object.id;
                        }
                        return value;
                    };
                    var isProjectedIds = [];
                    Projector.getAll().forEach(function (projector) {
                        if (typeof _.findKey(projector.elements, predicate) === 'string') {
                            isProjectedIds.push(projector.id);
                        }
                    });
                    return isProjectedIds;
                },
                // project list of speakers
                projectListOfSpeakers: function(projectorId) {
                    var isProjectedIds = this.isListOfSpeakersProjected();
                    _.forEach(isProjectedIds, function (id) {
                        $http.post('/rest/core/projector/' + id + '/clear_elements/');
                    });
                    if (_.indexOf(isProjectedIds, projectorId) == -1) {
                        return $http.post(
                            '/rest/core/projector/' + projectorId + '/prune_elements/',
                            [{name: 'agenda/list-of-speakers', id: this.id}]
                        );
                    }
                },
                // check if list of speakers is projected
                isListOfSpeakersProjected: function () {
                    // Returns all ids of all projectors with an element with the
                    // name 'agenda/list-of-speakers' and the same id. Else returns an empty list.
                    var self = this;
                    var predicate = function (element) {
                        return element.name == 'agenda/list-of-speakers' &&
                               typeof element.id !== 'undefined' &&
                               element.id == self.id;
                    };
                    var isProjecteds = [];
                    Projector.getAll().forEach(function (projector) {
                        if (typeof _.findKey(projector.elements, predicate) === 'string') {
                            isProjecteds.push(projector.id);
                        }
                    });
                    return isProjecteds;
                },
                hasSubitems: function(items) {
                    var self = this;
                    var hasChild = false;
                    // Returns true if the item has at least one child item.
                    _.each(items, function (item) {
                        if (item.parent_id == self.id) {
                            hasChild = true;
                        }
                    });
                    return hasChild;
                }
            },
            relations: {
                hasMany: {
                    'core/tag': {
                        localField: 'tags',
                        localKeys: 'tags_id',
                    },
                    'agenda/speaker': {
                        localField: 'speakers',
                        foreignKey: 'item_id',
                    }
                }
            },
            beforeInject: function (resource, instance) {
                Speaker.ejectAll({where: {item_id: {'==': instance.id}}});
            }
        });
    }
])

.factory('AgendaTree', [
    function () {
        return {
            getTree: function (items) {
                // Sort items after there weight
                items.sort(function(itemA, itemB) {
                    return itemA.weight - itemB.weight;
                });

                // Build a dict with all children (dict-value) to a specific
                // item id (dict-key).
                var itemChildren = {};

                _.each(items, function (item) {
                    if (item.parent_id) {
                        // Add item to his parent. If it is the first child, then
                        // create a new list.
                        try {
                            itemChildren[item.parent_id].push(item);
                        } catch (error) {
                            itemChildren[item.parent_id] = [item];
                        }
                    }

                });

                // Recursive function that generates a nested list with all
                // items with there children
                function getChildren(items) {
                    var returnItems = [];
                    _.each(items, function (item) {
                        returnItems.push({
                            item: item,
                            children: getChildren(itemChildren[item.id]),
                            id: item.id,
                        });
                    });
                    return returnItems;
                }

                // Generates the list of root items (with no parents)
                var parentItems = items.filter(function (item) {
                    return !item.parent_id;
                });
                return getChildren(parentItems);
            },

            // Returns a list of all items as a flat tree
            getFlatTree: function(items) {
                var tree = this.getTree(items);
                var flatItems = [];

                function generateFlatTree(tree, parentCount) {
                    _.each(tree, function (item) {
                        item.item.parentCount = parentCount;
                        flatItems.push(item.item);
                        generateFlatTree(item.children, parentCount + 1);
                    });
                }
                generateFlatTree(tree, 0);
                return flatItems;
            }
        };
    }
])

.factory('CurrentListOfSpeakersItem', [
    'Projector',
    'Agenda',
    function (Projector, Agenda) {
        return {
            getItem: function (projectorId) {
                var projector = Projector.get(projectorId), item;
                if (projector) {
                    _.forEach(projector.elements, function(element) {
                        if (element.agenda_item_id) {
                            item = Agenda.get(element.agenda_item_id);
                        }
                    });
                }
                return item;
            }
        };
    }
])

.factory('CurrentListOfSpeakersSlide', [
    '$http',
    'Projector',
    function($http, Projector) {
        var name = 'agenda/current-list-of-speakers';
        return {
            project: function (projectorId, overlay) {
                var isProjected = this.isProjectedWithOverlayStatus();
                _.forEach(isProjected, function (mapping) {
                    $http.post('/rest/core/projector/' + mapping.projectorId + '/deactivate_elements/',
                        [mapping.uuid]
                    );
                });

                // The slide was projected, if the id matches. If the overlay is given, also
                // the overlay is checked
                var wasProjectedBefore = _.some(isProjected, function (mapping) {
                    var value = (mapping.projectorId === projectorId);
                    if (overlay !== undefined) {
                        value = value && (mapping.overlay === overlay);
                    }
                    return value;
                });
                overlay = overlay || false; // set overlay if it wasn't defined

                if (!wasProjectedBefore) {
                    var activate = function () {
                        return $http.post(
                            '/rest/core/projector/' + projectorId + '/activate_elements/',
                             [{name: name,
                               stable: overlay, // if this is an overlay, it should not be
                                                // removed by changing the main content
                               overlay: overlay}]
                        );
                    };
                    if (!overlay) {
                        // clear all elements on this projector, because we are _not_ using the overlay.
                        $http.post('/rest/core/projector/' + projectorId + '/clear_elements/').then(activate);
                    } else {
                        activate();
                    }
                }
            },
            isProjected: function () {
                // Returns the ids of all projectors with an agenda-item element. Else return an empty list.
                var predicate = function (element) {
                    return element.name === name;
                };
                var isProjectedIds = [];
                Projector.getAll().forEach(function (projector) {
                    if (typeof _.findKey(projector.elements, predicate) === 'string') {
                        isProjectedIds.push(projector.id);
                    }
                });
                return isProjectedIds;
            },
            // Returns a list of mappings between pojector id, overlay and uuid.
            isProjectedWithOverlayStatus: function () {
                var mapping = [];
                _.forEach(Projector.getAll(), function (projector) {
                    _.forEach(projector.elements, function (element, uuid) {
                        if (element.name === name) {
                            mapping.push({
                                projectorId: projector.id,
                                uuid: uuid,
                                overlay: element.overlay || false,
                            });
                        }
                    });
                });
                return mapping;
            },
        };
    }
])



// Make sure that the Agenda resource is loaded.
.run(['Agenda', function(Agenda) {}]);

}());
