import async from "async";

import { isAdminRequired, isLoginRequired } from "./hooks";

import moduleManager from "../../index";

const DBModule = moduleManager.modules.db;
const UtilsModule = moduleManager.modules.utils;
const WSModule = moduleManager.modules.ws;
const SongsModule = moduleManager.modules.songs;
const CacheModule = moduleManager.modules.cache;
const ActivitiesModule = moduleManager.modules.activities;

CacheModule.runJob("SUB", {
	channel: "report.issue.toggle",
	cb: data =>
		WSModule.runJob("EMIT_TO_ROOMS", {
			rooms: [`edit-song.${data.songId}`, `view-report.${data.reportId}`],
			args: [
				"event:admin.report.issue.toggled",
				{ data: { issueId: data.issueId, reportId: data.reportId, resolved: data.resolved } }
			]
		})
});

CacheModule.runJob("SUB", {
	channel: "report.resolve",
	cb: ({ reportId, songId }) =>
		WSModule.runJob("EMIT_TO_ROOMS", {
			rooms: ["admin.reports", `edit-song.${songId}`, `view-report.${reportId}`],
			args: ["event:admin.report.resolved", { data: { reportId } }]
		})
});

CacheModule.runJob("SUB", {
	channel: "report.create",
	cb: report => {
		console.log(report);

		DBModule.runJob("GET_MODEL", { modelName: "user" }, this).then(userModel => {
			userModel
				.findById(report.createdBy)
				.select({ avatar: -1, name: -1, username: -1 })
				.exec((err, { avatar, name, username }) => {
					report.createdBy = {
						avatar,
						name,
						username,
						_id: report.createdBy
					};

					WSModule.runJob("EMIT_TO_ROOMS", {
						rooms: ["admin.reports", `edit-song.${report.song._id}`],
						args: ["event:admin.report.created", { data: { report } }]
					});
				});
		});
	}
});

export default {
	/**
	 * Gets reports, used in the admin reports page by the AdvancedTable component
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param page - the page
	 * @param pageSize - the size per page
	 * @param properties - the properties to return for each user
	 * @param sort - the sort object
	 * @param queries - the queries array
	 * @param operator - the operator for queries
	 * @param cb
	 */
	getData: isAdminRequired(async function getSet(session, page, pageSize, properties, sort, queries, operator, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);

		async.waterfall(
			[
				// Creates pipeline array
				next => next(null, []),

				// If a filter exists for createdBy, add createdByUsername property to all documents
				(pipeline, next) => {
					// Check if a filter with the createdBy property exists
					const createdByFilterExists =
						queries.map(query => query.filter.property).indexOf("createdBy") !== -1;
					// If no such filter exists, skip this function
					if (!createdByFilterExists) return next(null, pipeline);

					// Adds createdByOID field, which is an ObjectId version of createdBy
					pipeline.push({
						$addFields: {
							createdByOID: {
								$convert: {
									input: "$createdBy",
									to: "objectId",
									onError: "unknown",
									onNull: "unknown"
								}
							}
						}
					});

					// Looks up user(s) with the same _id as the createdByOID and puts the result in the createdByUser field
					pipeline.push({
						$lookup: {
							from: "users",
							localField: "createdByOID",
							foreignField: "_id",
							as: "createdByUser"
						}
					});

					// Unwinds the createdByUser array field into an object
					pipeline.push({
						$unwind: {
							path: "$createdByUser",
							preserveNullAndEmptyArrays: true
						}
					});

					// Adds createdByUsername field from the createdByUser username, or unknown if it doesn't exist
					pipeline.push({
						$addFields: {
							createdByUsername: {
								$ifNull: ["$createdByUser.username", "unknown"]
							}
						}
					});

					// Removes the createdByOID and createdByUser property, just in case it doesn't get removed at a later stage
					pipeline.push({
						$project: {
							createdByOID: 0,
							createdByUser: 0
						}
					});

					return next(null, pipeline);
				},

				// Adds the match stage to aggregation pipeline, which is responsible for filtering
				(pipeline, next) => {
					let queryError;
					const newQueries = queries.flatMap(query => {
						const { data, filter, filterType } = query;
						const newQuery = {};
						if (filterType === "regex") {
							newQuery[filter.property] = new RegExp(`${data.slice(1, data.length - 1)}`, "i");
						} else if (filterType === "contains") {
							newQuery[filter.property] = new RegExp(
								`${data.replaceAll(/[.*+?^${}()|[\]\\]/g, "\\$&")}`,
								"i"
							);
						} else if (filterType === "exact") {
							newQuery[filter.property] = data.toString();
						} else if (filterType === "datetimeBefore") {
							newQuery[filter.property] = { $lte: new Date(data) };
						} else if (filterType === "datetimeAfter") {
							newQuery[filter.property] = { $gte: new Date(data) };
						} else if (filterType === "numberLesserEqual") {
							newQuery[filter.property] = { $lte: Number(data) };
						} else if (filterType === "numberLesser") {
							newQuery[filter.property] = { $lt: Number(data) };
						} else if (filterType === "numberGreater") {
							newQuery[filter.property] = { $gt: Number(data) };
						} else if (filterType === "numberGreaterEqual") {
							newQuery[filter.property] = { $gte: Number(data) };
						} else if (filterType === "numberEquals") {
							newQuery[filter.property] = { $eq: Number(data) };
						} else if (filterType === "boolean") {
							newQuery[filter.property] = { $eq: !!data };
						}

						if (filter.property === "createdBy")
							return { $or: [newQuery, { createdByUsername: newQuery.createdBy }] };

						return newQuery;
					});
					if (queryError) next(queryError);

					const queryObject = {};
					if (newQueries.length > 0) {
						if (operator === "and") queryObject.$and = newQueries;
						else if (operator === "or") queryObject.$or = newQueries;
						else if (operator === "nor") queryObject.$nor = newQueries;
					}

					pipeline.push({ $match: queryObject });

					next(null, pipeline);
				},

				// Adds sort stage to aggregation pipeline if there is at least one column being sorted, responsible for sorting data
				(pipeline, next) => {
					const newSort = Object.fromEntries(
						Object.entries(sort).map(([property, direction]) => [
							property,
							direction === "ascending" ? 1 : -1
						])
					);
					if (Object.keys(newSort).length > 0) pipeline.push({ $sort: newSort });
					next(null, pipeline);
				},

				// Adds first project stage to aggregation pipeline, responsible for including only the requested properties
				(pipeline, next) => {
					pipeline.push({ $project: Object.fromEntries(properties.map(property => [property, 1])) });

					next(null, pipeline);
				},

				// Adds the facet stage to aggregation pipeline, responsible for returning a total document count, skipping and limitting the documents that will be returned
				(pipeline, next) => {
					pipeline.push({
						$facet: {
							count: [{ $count: "count" }],
							documents: [{ $skip: pageSize * (page - 1) }, { $limit: pageSize }]
						}
					});

					// console.dir(pipeline, { depth: 6 });

					next(null, pipeline);
				},

				// Executes the aggregation pipeline
				(pipeline, next) => {
					reportModel.aggregate(pipeline).exec((err, result) => {
						// console.dir(err);
						// console.dir(result, { depth: 6 });
						if (err) return next(err);
						if (result[0].count.length === 0) return next(null, 0, []);
						const { count } = result[0].count[0];
						const { documents } = result[0];
						// console.log(111, err, result, count, documents[0]);
						return next(null, count, documents);
					});
				}
			],
			async (err, count, reports) => {
				if (err && err !== true) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "REPORTS_GET_DATA", `Failed to get data from reports. "${err}"`);
					return cb({ status: "error", message: err });
				}
				this.log("SUCCESS", "REPORTS_GET_DATA", `Got data from reports successfully.`);
				return cb({
					status: "success",
					message: "Successfully got data from reports.",
					data: { data: reports, count }
				});
			}
		);
	}),

	/**
	 * Gets a specific report
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} reportId - the id of the report to return
	 * @param {Function} cb - gets called with the result
	 */
	findOne: isAdminRequired(async function findOne(session, reportId, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);
		const userModel = await DBModule.runJob("GET_MODEL", { modelName: "user" }, this);

		async.waterfall(
			[
				next => reportModel.findOne({ _id: reportId }).exec(next),
				(report, next) =>
					userModel
						.findById(report.createdBy)
						.select({ avatar: -1, name: -1, username: -1 })
						.exec((err, user) => {
							if (!user)
								next(err, {
									...report._doc,
									createdBy: { _id: report.createdBy }
								});
							else
								next(err, {
									...report._doc,
									createdBy: {
										avatar: user.avatar,
										name: user.name,
										username: user.username,
										_id: report.createdBy
									}
								});
						})
			],
			async (err, report) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "REPORTS_FIND_ONE", `Finding report "${reportId}" failed. "${err}"`);
					return cb({ status: "error", message: err });
				}

				this.log("SUCCESS", "REPORTS_FIND_ONE", `Finding report "${reportId}" successful.`);
				return cb({ status: "success", data: { report } });
			}
		);
	}),

	/**
	 * Gets all reports for a songId
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} songId - the id of the song to index reports for
	 * @param {Function} cb - gets called with the result
	 */
	getReportsForSong: isAdminRequired(async function getReportsForSong(session, songId, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);
		const userModel = await DBModule.runJob("GET_MODEL", { modelName: "user" }, this);

		async.waterfall(
			[
				next =>
					reportModel.find({ "song._id": songId, resolved: false }).sort({ createdAt: "desc" }).exec(next),

				(_reports, next) => {
					const reports = [];

					async.each(
						_reports,
						(report, cb) => {
							userModel
								.findById(report.createdBy)
								.select({ avatar: -1, name: -1, username: -1 })
								.exec((err, user) => {
									if (!user)
										reports.push({
											...report._doc,
											createdBy: { _id: report.createdBy }
										});
									else
										reports.push({
											...report._doc,
											createdBy: {
												avatar: user.avatar,
												name: user.name,
												username: user.username,
												_id: report.createdBy
											}
										});

									return cb(err);
								});
						},
						err => next(err, reports)
					);
				}
			],
			async (err, reports) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "GET_REPORTS_FOR_SONG", `Indexing reports for song "${songId}" failed. "${err}"`);
					return cb({ status: "error", message: err });
				}

				this.log("SUCCESS", "GET_REPORTS_FOR_SONG", `Indexing reports for song "${songId}" successful.`);
				return cb({ status: "success", data: { reports } });
			}
		);
	}),

	/**
	 * Gets all a users reports for a specific songId
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} songId - the id of the song
	 * @param {Function} cb - gets called with the result
	 */
	myReportsForSong: isLoginRequired(async function myReportsForSong(session, songId, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);
		const userModel = await DBModule.runJob("GET_MODEL", { modelName: "user" }, this);

		async.waterfall(
			[
				next =>
					reportModel
						.find({ "song._id": songId, createdBy: session.userId, resolved: false })
						.sort({ createdAt: "desc" })
						.exec(next),

				(_reports, next) => {
					const reports = [];

					async.each(
						_reports,
						(report, cb) => {
							userModel
								.findById(report.createdBy)
								.select({ avatar: -1, name: -1, username: -1 })
								.exec((err, user) => {
									if (!user)
										reports.push({
											...report._doc,
											createdBy: { _id: report.createdBy }
										});
									else
										reports.push({
											...report._doc,
											createdBy: {
												avatar: user.avatar,
												name: user.name,
												username: user.username,
												_id: report.createdBy
											}
										});

									return cb(err);
								});
						},
						err => next(err, reports)
					);
				}
			],
			async (err, reports) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log(
						"ERROR",
						"MY_REPORTS_FOR_SONG",
						`Indexing reports of user ${session.userId} for song "${songId}" failed. "${err}"`
					);
					return cb({ status: "error", message: err });
				}

				this.log(
					"SUCCESS",
					"MY_REPORTS_FOR_SONG",
					`Indexing reports of user ${session.userId} for song "${songId}" successful.`
				);

				return cb({ status: "success", data: { reports } });
			}
		);
	}),

	/**
	 * Resolves a report as a whole
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} reportId - the id of the report that is getting resolved
	 * @param {Function} cb - gets called with the result
	 */
	resolve: isAdminRequired(async function resolve(session, reportId, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);

		async.waterfall(
			[
				next => {
					reportModel.findById(reportId).exec(next);
				},

				(report, next) => {
					if (!report) return next("Report not found.");

					report.resolved = true;

					return report.save(err => {
						if (err) return next(err.message);
						return next(null, report.song._id);
					});
				}
			],
			async (err, songId) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log(
						"ERROR",
						"REPORTS_RESOLVE",
						`Resolving report "${reportId}" failed by user "${session.userId}". "${err}"`
					);
					return cb({ status: "error", message: err });
				}

				CacheModule.runJob("PUB", {
					channel: "report.resolve",
					value: { reportId, songId }
				});

				this.log("SUCCESS", "REPORTS_RESOLVE", `User "${session.userId}" resolved report "${reportId}".`);

				return cb({
					status: "success",
					message: "Successfully resolved Report"
				});
			}
		);
	}),

	/**
	 * Resolves/Unresolves an issue within a report
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} reportId - the id of the report that is getting resolved
	 * @param {string} issueId - the id of the issue within the report
	 * @param {Function} cb - gets called with the result
	 */
	toggleIssue: isAdminRequired(async function toggleIssue(session, reportId, issueId, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);

		async.waterfall(
			[
				next => {
					reportModel.findById(reportId).exec(next);
				},

				(report, next) => {
					if (!report) return next("Report not found.");

					const issue = report.issues.find(issue => issue._id.toString() === issueId);
					issue.resolved = !issue.resolved;

					return report.save(err => {
						if (err) return next(err.message);
						return next(null, issue.resolved, report.song._id);
					});
				}
			],
			async (err, resolved, songId) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log(
						"ERROR",
						"REPORTS_TOGGLE_ISSUE",
						`Resolving an issue within report "${reportId}" failed by user "${session.userId}". "${err}"`
					);
					return cb({ status: "error", message: err });
				}

				CacheModule.runJob("PUB", {
					channel: "report.issue.toggle",
					value: { reportId, issueId, songId, resolved }
				});

				this.log(
					"SUCCESS",
					"REPORTS_TOGGLE_ISSUE",
					`User "${session.userId}" resolved an issue in report "${reportId}".`
				);

				return cb({
					status: "success",
					message: "Successfully resolved issue within report"
				});
			}
		);
	}),

	/**
	 * Creates a new report
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {object} report - the object of the report data
	 * @param {string} report.youtubeId - the youtube id of the song that is being reported
	 * @param {Array} report.issues - all issues reported (custom or defined)
	 * @param {Function} cb - gets called with the result
	 */
	create: isLoginRequired(async function create(session, report, cb) {
		const reportModel = await DBModule.runJob("GET_MODEL", { modelName: "report" }, this);
		const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);

		const { youtubeId } = report;

		async.waterfall(
			[
				next => songModel.findOne({ youtubeId }).exec(next),

				(song, next) => {
					if (!song) return next("Song not found.");

					return SongsModule.runJob("GET_SONG", { songId: song._id }, this)
						.then(res => next(null, res.song))
						.catch(next);
				},

				(song, next) => {
					if (!song) return next("Song not found.");

					delete report.youtubeId;
					report.song = {
						_id: song._id,
						youtubeId: song.youtubeId
					};

					return next(null, { title: song.title, artists: song.artists, thumbnail: song.thumbnail });
				},

				(song, next) =>
					reportModel.create(
						{
							createdBy: session.userId,
							createdAt: Date.now(),
							...report
						},
						(err, report) => next(err, report, song)
					)
			],
			async (err, report, song) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log(
						"ERROR",
						"REPORTS_CREATE",
						`Creating report for "${report.song._id}" failed by user "${session.userId}". "${err}"`
					);
					return cb({ status: "error", message: err });
				}

				ActivitiesModule.runJob("ADD_ACTIVITY", {
					userId: session.userId,
					type: "song__report",
					payload: {
						message: `Created a <reportId>${report._id}</reportId> for song <youtubeId>${song.title}</youtubeId>`,
						youtubeId: report.song.youtubeId,
						reportId: report._id,
						thumbnail: song.thumbnail
					}
				});

				CacheModule.runJob("PUB", {
					channel: "report.create",
					value: report
				});

				this.log("SUCCESS", "REPORTS_CREATE", `User "${session.userId}" created report for "${youtubeId}".`);

				return cb({
					status: "success",
					message: "Successfully created report"
				});
			}
		);
	})
};