"use strict";

var async = require('async');
var validator = require('validator');
var nconf = require('nconf');

var meta = require('../meta');
var user = require('../user');
var posts = require('../posts');
var topics = require('../topics');
var categories = require('../categories');
var privileges = require('../privileges');
var plugins = require('../plugins');
var widgets = require('../widgets');
var accountHelpers = require('../controllers/accounts/helpers');

var apiController = {};

apiController.getConfig = function(req, res, next) {
	var config = {};
	config.environment = process.env.NODE_ENV;
	config.relative_path = nconf.get('relative_path');
	config.version = nconf.get('version');
	config.siteTitle = validator.escape(String(meta.config.title || meta.config.browserTitle || 'NodeBB'));
	config.browserTitle = validator.escape(String(meta.config.browserTitle || meta.config.title || 'NodeBB'));
	config.titleLayout = (meta.config.titleLayout || '{pageTitle} | {browserTitle}').replace(/{/g, '{').replace(/}/g, '}');
	config.showSiteTitle = parseInt(meta.config.showSiteTitle, 10) === 1;
	config.minimumTitleLength = meta.config.minimumTitleLength;
	config.maximumTitleLength = meta.config.maximumTitleLength;
	config.minimumPostLength = meta.config.minimumPostLength;
	config.maximumPostLength = meta.config.maximumPostLength;
	config.minimumTagsPerTopic = meta.config.minimumTagsPerTopic || 0;
	config.maximumTagsPerTopic = meta.config.maximumTagsPerTopic || 5;
	config.minimumTagLength = meta.config.minimumTagLength || 3;
	config.maximumTagLength = meta.config.maximumTagLength || 15;
	config.hasImageUploadPlugin = plugins.hasListeners('filter:uploadImage');
	config.useOutgoingLinksPage = parseInt(meta.config.useOutgoingLinksPage, 10) === 1;
	config.allowGuestSearching = parseInt(meta.config.allowGuestSearching, 10) === 1;
	config.allowGuestUserSearching = parseInt(meta.config.allowGuestUserSearching, 10) === 1;
	config.allowGuestHandles = parseInt(meta.config.allowGuestHandles, 10) === 1;
	config.allowFileUploads = parseInt(meta.config.allowFileUploads, 10) === 1;
	config.allowTopicsThumbnail = parseInt(meta.config.allowTopicsThumbnail, 10) === 1;
	config.usePagination = parseInt(meta.config.usePagination, 10) === 1;
	config.disableChat = parseInt(meta.config.disableChat, 10) === 1;
	config.socketioTransports = nconf.get('socket.io:transports') || ['polling', 'websocket'];
	config.websocketAddress = nconf.get('socket.io:address') || '';
	config.maxReconnectionAttempts = meta.config.maxReconnectionAttempts || 5;
	config.reconnectionDelay = meta.config.reconnectionDelay || 1500;
	config.topicsPerPage = meta.config.topicsPerPage || 20;
	config.postsPerPage = meta.config.postsPerPage || 20;
	config.maximumFileSize = meta.config.maximumFileSize;
	config['theme:id'] = meta.config['theme:id'];
	config['theme:src'] = meta.config['theme:src'];
	config.defaultLang = meta.config.defaultLang || 'en_GB';
	config.userLang = req.query.lang ? validator.escape(String(req.query.lang)) : config.defaultLang;
	config.loggedIn = !!req.user;
	config['cache-buster'] = meta.config['cache-buster'] || '';
	config.requireEmailConfirmation = parseInt(meta.config.requireEmailConfirmation, 10) === 1;
	config.topicPostSort = meta.config.topicPostSort || 'oldest_to_newest';
	config.categoryTopicSort = meta.config.categoryTopicSort || 'newest_to_oldest';
	config.csrf_token = req.csrfToken();
	config.searchEnabled = plugins.hasListeners('filter:search.query');
	config.bootswatchSkin = 'default';

	async.waterfall([
		function (next) {
			if (!req.user) {
				return next(null, config);
			}
			user.getSettings(req.uid, next);
		},
		function (settings, next) {
			config.usePagination = settings.usePagination;
			config.topicsPerPage = settings.topicsPerPage;
			config.postsPerPage = settings.postsPerPage;
			config.userLang = (req.query.lang ? validator.escape(String(req.query.lang)) : null) || settings.userLang || config.defaultLang;
			config.openOutgoingLinksInNewTab = settings.openOutgoingLinksInNewTab;
			config.topicPostSort = settings.topicPostSort || config.topicPostSort;
			config.categoryTopicSort = settings.categoryTopicSort || config.categoryTopicSort;
			config.topicSearchEnabled = settings.topicSearchEnabled || false;
			config.delayImageLoading = settings.delayImageLoading !== undefined ? settings.delayImageLoading : true;
			config.bootswatchSkin = settings.bootswatchSkin || config.bootswatchSkin;
			plugins.fireHook('filter:config.get', config, next);
		}
	], function(err, config) {
		if (err) {
			return next(err);
		}

		if (res.locals.isAPI) {
			res.json(config);
		} else {
			next(null, config);
		}
	});
};


apiController.renderWidgets = function(req, res, next) {
	var areas = {
		template: req.query.template,
		locations: req.query.locations,
		url: req.query.url
	};

	if (!areas.template || !areas.locations) {
		return res.status(200).json({});
	}

	widgets.render(req.uid,
		{
			template: areas.template,
			url: areas.url,
			locations: areas.locations,
			isMobile: req.query.isMobile === 'true'
		},
		req,
		res,
		function(err, widgets) {
		if (err) {
			return next(err);
		}
		res.status(200).json(widgets);
	});
};

apiController.getPostData = function(pid, uid, callback) {
	async.parallel({
		privileges: function(next) {
			privileges.posts.get([pid], uid, next);
		},
		post: function(next) {
			posts.getPostData(pid, next);
		}
	}, function(err, results) {
		if (err || !results.post) {
			return callback(err);
		}

		var post = results.post;
		var privileges = results.privileges[0];

		if (!privileges.read || !privileges['topics:read']) {
			return callback();
		}

		post.ip = privileges.isAdminOrMod ? post.ip : undefined;
		var selfPost = uid && uid === parseInt(post.uid, 10);
		if (post.deleted && !(privileges.isAdminOrMod || selfPost)) {
			post.content = '[[topic:post_is_deleted]]';
		}
		callback(null, post);
	});
};

apiController.getTopicData = function(tid, uid, callback) {
	async.parallel({
		privileges: function(next) {
			privileges.topics.get(tid, uid, next);
		},
		topic: function(next) {
			topics.getTopicData(tid, next);
		}
	}, function(err, results) {
		if (err || !results.topic) {
			return callback(err);
		}

		if (!results.privileges.read || !results.privileges['topics:read'] || (parseInt(results.topic.deleted, 10) && !results.privileges.view_deleted)) {
			return callback();
		}
		callback(null, results.topic);
	});
};

apiController.getCategoryData = function(cid, uid, callback) {
	async.parallel({
		privileges: function(next) {
			privileges.categories.get(cid, uid, next);
		},
		category: function(next) {
			categories.getCategoryData(cid, next);
		}
	}, function(err, results) {
		if (err || !results.category) {
			return callback(err);
		}

		if (!results.privileges.read) {
			return callback();
		}
		callback(null, results.category);
	});
};


apiController.getObject = function(req, res, next) {
	var methods = {
		post: apiController.getPostData,
		topic: apiController.getTopicData,
		category: apiController.getCategoryData
	};
	var method = methods[req.params.type];
	if (!method) {
		return next();
	}
	method(req.params.id, req.uid, function(err, result) {
		if (err || !result) {
			return next(err);
		}

		res.json(result);
	});
};

apiController.getCurrentUser = function(req, res, next) {
	if (!req.uid) {
		return res.status(401).json('not-authorized');
	}
	async.waterfall([
		function(next) {
			user.getUserField(req.uid, 'userslug', next);
		},
		function(userslug, next) {
			accountHelpers.getUserDataByUserSlug(userslug, req.uid, next);
		}
	], function(err, userData) {
		if (err) {
			return next(err);
		}
		res.json(userData);
	});
};

apiController.getUserByUID = function(req, res, next) {
	byType('uid', req, res, next);
};

apiController.getUserByUsername = function(req, res, next) {
	byType('username', req, res, next);
};

apiController.getUserByEmail = function(req, res, next) {
	byType('email', req, res, next);
};

function byType(type, req, res, next) {
	apiController.getUserDataByField(req.uid, type, req.params[type], function(err, data) {
		if (err || !data) {
			return next(err);
		}
		res.json(data);
	});
}

apiController.getUserDataByField = function(callerUid, field, fieldValue, callback) {
	async.waterfall([
		function (next) {
			if (field === 'uid') {
				next(null, fieldValue);
			} else if (field === 'username') {
				user.getUidByUsername(fieldValue, next);
			} else if (field === 'email') {
				user.getUidByEmail(fieldValue, next);
			} else {
				next();
			}
		},
		function (uid, next) {
			if (!uid) {
				return next();
			}
			apiController.getUserDataByUID(callerUid, uid, next);
		}
	], callback);
};

apiController.getUserDataByUID = function(callerUid, uid, callback) {
	if (!parseInt(callerUid, 10) && parseInt(meta.config.privateUserInfo, 10) === 1) {
		return callback(new Error('[[error:no-privileges]]'));
	}

	if (!parseInt(uid, 10)) {
		return callback(new Error('[[error:no-user]]'));
	}

	async.parallel({
		userData: async.apply(user.getUserData, uid),
		settings: async.apply(user.getSettings, uid)
	}, function(err, results) {
		if (err || !results.userData) {
			return callback(err || new Error('[[error:no-user]]'));
		}

		results.userData.email = results.settings.showemail ? results.userData.email : undefined;
		results.userData.fullname = results.settings.showfullname ? results.userData.fullname : undefined;

		callback(null, results.userData);
	});
};

apiController.getModerators = function(req, res, next) {
	categories.getModerators(req.params.cid, function(err, moderators) {
		if (err) {
			return next(err);
		}
		res.json({moderators: moderators});
	});
};


apiController.getRecentPosts = function(req, res, next) {
	posts.getRecentPosts(req.uid, 0, 19, req.params.term, function (err, data) {
		if (err) {
			return next(err);
		}

		res.json(data);
	});
};

module.exports = apiController;