'use strict';

var async = require('async');
var winston = require('winston');
var templates = require('templates.js');

var plugins = require('../plugins');
var translator = require('../translator');
var db = require('../database');

var widgets = {};

widgets.render = function (uid, area, req, res, callback) {
	if (!area.locations || !area.template) {
		return callback(new Error('[[error:invalid-data]]'));
	}

	widgets.getAreas(['global', area.template], area.locations, function (err, data) {
		if (err) {
			return callback(err);
		}

		var widgetsByLocation = {};

		async.map(area.locations, function (location, done) {
			widgetsByLocation[location] = data.global[location].concat(data[area.template][location]);

			if (!widgetsByLocation[location].length) {
				return done(null, { location: location, widgets: [] });
			}

			async.map(widgetsByLocation[location], function (widget, next) {
				if (!widget || !widget.data ||
					(!!widget.data['hide-registered'] && uid !== 0) ||
					(!!widget.data['hide-guests'] && uid === 0) ||
					(!!widget.data['hide-mobile'] && area.isMobile)) {
					return next();
				}

				plugins.fireHook('filter:widget.render:' + widget.widget, {
					uid: uid,
					area: area,
					data: widget.data,
					req: req,
					res: res,
				}, function (err, data) {
					if (err || data === null) {
						return next(err);
					}
					var html = data;
					if (typeof html !== 'string') {
						html = data.html;
					} else {
						winston.warn('[widgets.render] passing a string is deprecated!, filter:widget.render:' + widget.widget + '. Please set hookData.html in your plugin.');
					}

					if (widget.data.container && widget.data.container.match('{body}')) {
						translator.translate(widget.data.title, function (title) {
							html = templates.parse(widget.data.container, {
								title: title,
								body: html,
							});

							next(null, { html: html });
						});
					} else {
						next(null, { html: html });
					}
				});
			}, function (err, result) {
				done(err, { location: location, widgets: result.filter(Boolean) });
			});
		}, callback);
	});
};

widgets.getAreas = function (templates, locations, callback) {
	var keys = templates.map(function (tpl) {
		return 'widgets:' + tpl;
	});
	db.getObjectsFields(keys, locations, function (err, data) {
		if (err) {
			return callback(err);
		}

		var returnData = {};

		templates.forEach(function (template, index) {
			returnData[template] = returnData[template] || {};
			locations.forEach(function (location) {
				if (data && data[index] && data[index][location]) {
					try {
						returnData[template][location] = JSON.parse(data[index][location]);
					} catch (err) {
						winston.error('can not parse widget data. template:  ' + template + ' location: ' + location);
						returnData[template][location] = [];
					}
				} else {
					returnData[template][location] = [];
				}
			});
		});

		callback(null, returnData);
	});
};

widgets.getArea = function (template, location, callback) {
	db.getObjectField('widgets:' + template, location, function (err, result) {
		if (err) {
			return callback(err);
		}
		if (!result) {
			return callback(null, []);
		}
		try {
			result = JSON.parse(result);
		} catch (err) {
			return callback(err);
		}

		callback(null, result);
	});
};

widgets.setArea = function (area, callback) {
	if (!area.location || !area.template) {
		return callback(new Error('Missing location and template data'));
	}

	db.setObjectField('widgets:' + area.template, area.location, JSON.stringify(area.widgets), callback);
};

widgets.reset = function (callback) {
	var defaultAreas = [
		{ name: 'Draft Zone', template: 'global', location: 'header' },
		{ name: 'Draft Zone', template: 'global', location: 'footer' },
		{ name: 'Draft Zone', template: 'global', location: 'sidebar' },
	];

	async.parallel({
		areas: function (next) {
			plugins.fireHook('filter:widgets.getAreas', defaultAreas, next);
		},
		drafts: function (next) {
			widgets.getArea('global', 'drafts', next);
		},
	}, function (err, results) {
		if (err) {
			return callback(err);
		}

		var drafts = results.drafts || [];

		async.each(results.areas, function (area, next) {
			widgets.getArea(area.template, area.location, function (err, areaData) {
				if (err) {
					return next(err);
				}

				drafts = drafts.concat(areaData);
				area.widgets = [];
				widgets.setArea(area, next);
			});
		}, function (err) {
			if (err) {
				return callback(err);
			}
			widgets.setArea({
				template: 'global',
				location: 'drafts',
				widgets: drafts,
			}, callback);
		});
	});
};

module.exports = widgets;