'use strict';

var Backbone = require('backbone'),
    AppSettingsModel = require('./app-settings-model'),
    MenuModel = require('./menu/menu-model'),
    EntryModel = require('./entry-model'),
    GroupModel = require('./group-model'),
    FileCollection = require('../collections/file-collection'),
    EntryCollection = require('../collections/entry-collection');

var AppModel = Backbone.Model.extend({
    defaults: {},

    initialize: function() {
        this.tags = [];
        this.files = new FileCollection();
        this.menu = new MenuModel();
        this.filter = {};
        this.sort = 'title';
        this.settings = AppSettingsModel.instance;

        this.listenTo(Backbone, 'refresh', this.refresh);
        this.listenTo(Backbone, 'set-filter', this.setFilter);
        this.listenTo(Backbone, 'add-filter', this.addFilter);
        this.listenTo(Backbone, 'set-sort', this.setSort);
    },

    addFile: function(file) {
        this.files.add(file);
        file.get('groups').forEach(function(group) { this.menu.groupsSection.addItem(group); }, this);
        this._addTags(file.db);
        this._tagsChanged();
        this.menu.filesSection.addItem({
            icon: 'lock',
            title: file.get('name'),
            page: 'file',
            file: file
        });
        this.refresh();
    },

    _addTags: function(group) {
        var tagsHash = {};
        this.tags.forEach(function(tag) {
            tagsHash[tag.toLowerCase()] = true;
        });
        _.forEach(group.entries, function(entry) {
            _.forEach(entry.tags, function(tag) {
                if (!tagsHash[tag.toLowerCase()]) {
                    tagsHash[tag.toLowerCase()] = true;
                    this.tags.push(tag);
                }
            }, this);
        }, this);
        _.forEach(group.groups, function(subGroup) {
            this._addTags(subGroup);
        }, this);
        this.tags.sort();
    },

    _tagsChanged: function() {
        if (this.tags.length) {
            this.menu.tagsSection.set('scrollable', true);
            this.menu.tagsSection.setItems(this.tags.map(function (tag) {
                return {title: tag, icon: 'tag', filterKey: 'tag', filterValue: tag};
            }));
        } else {
            this.menu.tagsSection.set('scrollable', false);
            this.menu.tagsSection.removeAllItems();
        }
    },

    updateTags: function() {
        var oldTags = this.tags.slice();
        this.tags.splice(0, this.tags.length);
        this.files.forEach(function(file) {
            this._addTags(file.db);
        }, this);
        if (!_.isEqual(oldTags, this.tags)) {
            this._tagsChanged();
        }
    },

    closeAllFiles: function() {
        this.files.reset();
        this.menu.groupsSection.removeAllItems();
        this.menu.tagsSection.set('scrollable', false);
        this.menu.tagsSection.removeAllItems();
        this.menu.filesSection.removeAllItems();
        this.tags.splice(0, this.tags.length);
        this.setFilter({});
    },

    setFilter: function(filter) {
        this.filter = filter;
        this.filter.subGroups = this.settings.get('expandGroups');
        var entries = this.getEntries();
        Backbone.trigger('filter', { filter: this.filter, sort: this.sort, entries: entries });
        Backbone.trigger('select-entry', entries.length ? entries.first() : null);
    },

    refresh: function() {
        this.setFilter(this.filter);
    },

    addFilter: function(filter) {
        this.setFilter(_.extend(this.filter, filter));
    },

    setSort: function(sort) {
        this.sort = sort;
        this.setFilter(this.filter);
    },

    getEntries: function() {
        var entries = new EntryCollection();
        var filter = this.prepareFilter();
        this.files.forEach(function(file) {
            file.forEachEntry(filter, function(entry) {
                entries.push(entry);
            });
        });
        entries.sortEntries(this.sort);
        if (entries.length) {
            entries.setActive(entries.first());
        }
        return entries;
    },

    prepareFilter: function() {
        var filter = _.clone(this.filter);
        if (filter.text) {
            filter.textLower = filter.text.toLowerCase();
        }
        if (filter.tag) {
            filter.tagLower = filter.tag.toLowerCase();
        }
        return filter;
    },

    getFirstSelectedGroup: function() {
        var selGroupId = this.filter.group;
        var file, group;
        if (selGroupId) {
            this.files.forEach(function(f) {
                group = f.getGroup(selGroupId);
                if (group) {
                    file = f;
                    return false;
                }
            }, this);
        }
        if (!group) {
            file = this.files.first();
            group = file.get('groups').first();
        }
        return { group: group, file: file };
    },

    createNewEntry: function() {
        var sel = this.getFirstSelectedGroup();
        return EntryModel.newEntry(sel.group, sel.file);
    },

    createNewGroup: function() {
        var sel = this.getFirstSelectedGroup();
        return GroupModel.newGroup(sel.group, sel.file);
    }
});

module.exports = AppModel;