import { CorporateUser, Type, User } from "@/interfaces/user";
import { getGroupsForUser, getParticipantGroups, getUserGroups, getUsersGroups } from "./groups.be";
import { uniq } from "lodash";
import { getUserCodes } from "./codes.be";
import client from "@/lib/mongodb";
import { EntityWithRoles, WithEntities } from "@/interfaces/entity";
import { getEntity } from "./entities.be";
import { getRole } from "./roles.be";
import {  groupAllowedEntitiesByPermissions } from "./permissions";
import { mapBy } from ".";

const db = client.db(process.env.MONGODB_DB);

export async function getUsers(filter?: object, limit = 0, sort = {}, projection = {}) {
	return await db
		.collection("users")
		.find<User>(filter || {}, { projection: { _id: 0, ...projection } })
		.limit(limit)
		.sort(sort)
		.toArray();
}

export async function searchUsers(searchInput?: string, limit = 50, page = 0, sort: object = { "name": 1 }, projection = {}, filter?: object) {
	const compoundFilter = {
		"compound": {
			"should": [...(searchInput != "" ? [{
				"autocomplete": {
					"query": searchInput,
					"path": "name",
				}
			}, {
				"autocomplete": {
					"query": searchInput,
					"path": "email",
				}
			}] : [{ exists: { path: "name" } }])],
			"minimumShouldMatch": 1,

		}
	}

	const [{ users, totalUsers }] = await db
		.collection("users").aggregate([
			{
				"$search": {
					"index": "UsersByNameEmail",
					...compoundFilter
				}
			},
			...(filter ? [{
				"$match": Object.entries(filter).reduce((accm, [key, value]) => {
					if (value.length === 0) return accm
					accm[key] = Array.isArray(value) ? { $in: value } : value
					return accm;
				}, {} as any)
			}] : []),
			{
				$facet: {
					totalUsers: [{ $count: "count" }],
					users: [
						{ $sort: sort },
						{ $skip: limit * page },
						{ $limit: limit },
						{ "$project": { _id: 0, label: { $concat: ["$name", " - ", "$email"] }, value: "$id", ...projection } }
					]
				}
			}
		]).toArray();
	return { users, total: totalUsers[0]?.count || 0 };
}

export async function countUsers(filter?: object) {
	return await db
		.collection("users")
		.countDocuments(filter || {})
}

export async function countUsersByTypes(types: Type[]) {
	return await db
		.collection("users")
		.aggregate([
			{
				$match: {
					type: { $in: types } // Filter only specified types
				}
			},
			{
				$group: {
					_id: "$type",
					count: { $sum: 1 } // Count documents in each group
				}
			},
			{
				$group: {
					_id: null,
					counts: {
						$push: { k: "$_id", v: "$count" } // Convert to key-value pairs
					}
				}
			},
			{
				$project: {
					_id: 0,
					result: { $arrayToObject: "$counts" } // Convert key-value pairs to an object
				}
			}
		]).toArray().then(([{ result }]) => result);

}

export async function getUserWithEntity(id: string): Promise<WithEntities<User> | undefined> {
	const user = await db.collection("users").findOne<User>({ id: id }, { projection: { _id: 0 } });
	if (!user) return undefined;

	const entities = await Promise.all(
		user.entities.map(async (e) => {
			const entity = await getEntity(e.id);
			const role = await getRole(e.role);

			return { entity, role };
		}),
	);

	return { ...user, entities };
}

export async function getUser(id: string, projection = {}): Promise<User | undefined> {
	const user = await db.collection("users").findOne<User>({ id: id }, { projection: { _id: 0, ...projection } });
	return !!user ? user : undefined;
}

export async function getSpecificUsers(ids: string[], projection = {}) {
	if (ids.length === 0) return [];

	return await db
		.collection("users")
		.find<User>({ id: { $in: ids } }, { projection: { _id: 0, ...projection } })
		.toArray();
}

export async function getEntityUsers(id: string, limit?: number, filter?: object, projection = {}) {
	return await db
		.collection("users")
		.find<User>({ "entities.id": id, ...(filter || {}) }, { projection: { _id: 0, ...projection } })
		.limit(limit || 0)
		.toArray();
}

export async function countEntityUsers(id: string, filter?: object) {
	return await db.collection("users").countDocuments({ "entities.id": id, ...(filter || {}) });
}

export async function getEntitiesUsers(ids: string[], filter?: object, limit?: number, projection = {}) {
	return await db
		.collection("users")
		.find<User>({ "entities.id": { $in: ids }, ...(filter || {}) }, { projection })
		.limit(limit || 0)
		.toArray();
}

export async function countEntitiesUsers(ids: string[], filter?: object) {
	return await db.collection("users").countDocuments({ "entities.id": { $in: ids }, ...(filter || {}) });
}

export async function getLinkedUsers(
	userID?: string,
	userType?: Type,
	type?: Type,
	page?: number,
	size?: number,
	sort?: string,
	direction?: "asc" | "desc",
) {
	const filters = {
		...(!!type ? { type } : {}),
	};

	if (!userID || userType === "admin" || userType === "developer") {
		const users = await db
			.collection("users")
			.find<User>(filters)
			.sort(sort ? { [sort]: direction === "desc" ? -1 : 1 } : {})
			.skip(page && size ? page * size : 0)
			.limit(size || 0)
			.toArray();

		const total = await db.collection("users").countDocuments(filters);
		return { users, total };
	}

	const adminGroups = await getUserGroups(userID);
	const groups = await getUsersGroups(adminGroups.flatMap((x) => x.participants));
	const belongingGroups = await getParticipantGroups(userID);

	const participants = uniq([
		...adminGroups.flatMap((x) => x.participants),
		...(userType === "mastercorporate" ? groups.flat().flatMap((x) => x.participants) : []),
		...(userType === "teacher" ? belongingGroups.flatMap((x) => x.participants) : []),
	]);

	//  ⨯ [FirebaseError: Invalid Query. A non-empty array is required for 'in' filters.] {
	if (participants.length === 0) return { users: [], total: 0 };

	const users = await db
		.collection("users")
		.find<User>({ ...filters, id: { $in: participants } })
		.skip(page && size ? page * size : 0)
		.limit(size || 0)
		.toArray();
	const total = await db.collection("users").countDocuments({ ...filters, id: { $in: participants } });

	return { users, total };
}

export async function getUserBalance(user: User) {
	const codes = await getUserCodes(user.id);
	if (user.type !== "corporate" && user.type !== "mastercorporate") return codes.length;

	const groups = await getGroupsForUser(user.id);
	const participants = uniq(groups.flatMap((x) => x.participants));

	if (user.type === "corporate") return participants.length + codes.filter((x) => !participants.includes(x.userId || "")).length;

	const participantUsers = await Promise.all(participants.map(getUser));
	const corporateUsers = participantUsers.filter((x) => x?.type === "corporate") as CorporateUser[];

	return (
		corporateUsers.reduce((acc, curr) => acc + 0, 0) +
		corporateUsers.length +
		codes.filter((x) => !participants.includes(x.userId || "") && !corporateUsers.map((u) => u.id).includes(x.userId || "")).length
	);
}

export const filterAllowedUsers = async (user: User, entities: EntityWithRoles[], projection = {}) => {

	const {
		["view_students"]: allowedStudentEntities,
		["view_teachers"]: allowedTeacherEntities,
		["view_corporates"]: allowedCorporateEntities,
		["view_mastercorporates"]: allowedMasterCorporateEntities,
	} = groupAllowedEntitiesByPermissions(user, entities, [
		"view_students",
		"view_teachers",
		'view_corporates',
		'view_mastercorporates',
	]);
	const [students, teachers, corporates, masterCorporates] = await Promise.all([
		getEntitiesUsers(mapBy(allowedStudentEntities, 'id'), { type: "student" }, 0, projection),
		getEntitiesUsers(mapBy(allowedTeacherEntities, 'id'), { type: "teacher" }, 0, projection),
		getEntitiesUsers(mapBy(allowedCorporateEntities, 'id'), { type: "corporate" }, 0, projection),
		getEntitiesUsers(mapBy(allowedMasterCorporateEntities, 'id'), { type: "mastercorporate" }, 0, projection),
	])

	return [...students, ...teachers, ...corporates, ...masterCorporates]
}

export const countAllowedUsers = async (user: User, entities: EntityWithRoles[]) => {
	const {
		["view_students"]: allowedStudentEntities,
		["view_teachers"]: allowedTeacherEntities,
		["view_corporates"]: allowedCorporateEntities,
		["view_mastercorporates"]: allowedMasterCorporateEntities,
	} = groupAllowedEntitiesByPermissions(user, entities, [
		"view_students",
		"view_teachers",
		'view_corporates',
		'view_mastercorporates',
	]);
	console.log(mapBy(allowedStudentEntities, 'id'))
	const [student, teacher, corporate, mastercorporate] = await Promise.all([
		countEntitiesUsers(mapBy(allowedStudentEntities, 'id'), { type: "student" }),
		countEntitiesUsers(mapBy(allowedTeacherEntities, 'id'), { type: "teacher" }),
		countEntitiesUsers(mapBy(allowedCorporateEntities, 'id'), { type: "corporate" }),
		countEntitiesUsers(mapBy(allowedMasterCorporateEntities, 'id'), { type: "mastercorporate" }),
	])
	console.log(student)
	return { student, teacher, corporate, mastercorporate }
}