/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let MessageHttpController;
const logger = require("logger-sharelatex");
const metrics = require("metrics-sharelatex");
const MessageManager = require("./MessageManager");
const MessageFormatter = require("./MessageFormatter");
const ThreadManager = require("../Threads/ThreadManager");
const {ObjectId} = require("../../mongojs");

module.exports = (MessageHttpController = {
	DEFAULT_MESSAGE_LIMIT: 50,
	MAX_MESSAGE_LENGTH: 10 * 1024, // 10kb, about 1,500 words
	
	getGlobalMessages(req, res, next) {
		return MessageHttpController._getMessages(ThreadManager.GLOBAL_THREAD, req, res, next);
	},

	sendGlobalMessage(req, res, next) {
		return MessageHttpController._sendMessage(ThreadManager.GLOBAL_THREAD, req, res, next);
	},
	
	sendThreadMessage(req, res, next) {
		return MessageHttpController._sendMessage(req.params.thread_id, req, res, next);
	},
	
	getAllThreads(req, res, next) {
		const {project_id} = req.params;
		logger.log({project_id}, "getting all threads");
		return ThreadManager.findAllThreadRooms(project_id, function(error, rooms) {
			if (error != null) { return next(error); }
			const room_ids = rooms.map(r => r._id);
			return MessageManager.findAllMessagesInRooms(room_ids, function(error, messages) {
				if (error != null) { return next(error); }
				const threads = MessageFormatter.groupMessagesByThreads(rooms, messages);
				return res.json(threads);
			});
		});
	},
	
	resolveThread(req, res, next) {
		const {project_id, thread_id} = req.params;
		const {user_id} = req.body;
		logger.log({user_id, project_id, thread_id}, "marking thread as resolved");
		return ThreadManager.resolveThread(project_id, thread_id, user_id, function(error) {
			if (error != null) { return next(error); }
			return res.send(204);
		});
	}, // No content

	reopenThread(req, res, next) {
		const {project_id, thread_id} = req.params;
		logger.log({project_id, thread_id}, "reopening thread");
		return ThreadManager.reopenThread(project_id, thread_id, function(error) {
			if (error != null) { return next(error); }
			return res.send(204);
		});
	}, // No content
	
	deleteThread(req, res, next) {
		const {project_id, thread_id} = req.params;
		logger.log({project_id, thread_id}, "deleting thread");
		return ThreadManager.deleteThread(project_id, thread_id, function(error, room_id) {
			if (error != null) { return next(error); }
			return MessageManager.deleteAllMessagesInRoom(room_id, function(error) {
				if (error != null) { return next(error); }
				return res.send(204);
			});
		});
	}, // No content
	
	editMessage(req, res, next) {
		const {content} = req != null ? req.body : undefined;
		const {project_id, thread_id, message_id} = req.params;
		logger.log({project_id, thread_id, message_id, content}, "editing message");
		return ThreadManager.findOrCreateThread(project_id, thread_id, function(error, room) {
			if (error != null) { return next(error); }
			return MessageManager.updateMessage(room._id, message_id, content, Date.now(), function(error) {
				if (error != null) { return next(error); }
				return res.send(204);
			});
		});
	},

	deleteMessage(req, res, next) {
		const {project_id, thread_id, message_id} = req.params;
		logger.log({project_id, thread_id, message_id}, "deleting message");
		return ThreadManager.findOrCreateThread(project_id, thread_id, function(error, room) {
			if (error != null) { return next(error); }
			return MessageManager.deleteMessage(room._id, message_id, function(error, message) {
				if (error != null) { return next(error); }
				return res.send(204);
			});
		});
	},

	_sendMessage(client_thread_id, req, res, next) {
		const {user_id, content} = req != null ? req.body : undefined;
		const {project_id} = req.params;
		if (!ObjectId.isValid(user_id)) {
			return res.send(400, "Invalid user_id");
		}
		if ((content == null)) {
			return res.send(400, "No content provided");
		}
		if (content.length > this.MAX_MESSAGE_LENGTH) {
			return res.send(400, `Content too long (> ${this.MAX_MESSAGE_LENGTH} bytes)`);
		}
		logger.log({client_thread_id, project_id, user_id, content}, "new message received");
		return ThreadManager.findOrCreateThread(project_id, client_thread_id, function(error, thread) {
			if (error != null) { return next(error); }
			return MessageManager.createMessage(thread._id, user_id, content, Date.now(), function(error, message) {
				if (error != null) { return next(error); }
				message = MessageFormatter.formatMessageForClientSide(message);
				message.room_id = project_id;
				return res.send(201, message);
			});
		});
	},

	_getMessages(client_thread_id, req, res, next) {
		let before, limit;
		const {project_id} = req.params;
		if ((req.query != null ? req.query.before : undefined) != null) {
			before = parseInt(req.query.before, 10);
		} else {
			before = null;
		}
		if ((req.query != null ? req.query.limit : undefined) != null) {
			limit = parseInt(req.query.limit, 10);
		} else {
			limit = MessageHttpController.DEFAULT_MESSAGE_LIMIT;
		}
		logger.log({limit, before, project_id, client_thread_id}, "get message request received");
		return ThreadManager.findOrCreateThread(project_id, client_thread_id, function(error, thread) {
			if (error != null) { return next(error); }
			const thread_object_id = thread._id;
			logger.log({limit, before, project_id, client_thread_id, thread_object_id}, "found or created thread");
			return MessageManager.getMessages(thread_object_id, limit, before, function(error, messages) {
				if (error != null) { return next(error); }
				messages = MessageFormatter.formatMessagesForClientSide(messages);
				logger.log({project_id, messages}, "got messages");
				return res.send(200, messages);
			});
		});
	}
});