import jwt from "jsonwebtoken"
import { Session, RefreshToken, User, TosViolations } from "@db_models"

export default class Token {
	static get authStrategy() {
		return {
			secret: process.env.JWT_SECRET,
			expiresIn: process.env.JWT_EXPIRES_IN ?? "24h",
			algorithm: process.env.JWT_ALGORITHM ?? "HS256",
		}
	}

	static get refreshStrategy() {
		return {
			secret: process.env.JWT_SECRET,
			expiresIn: process.env.JWT_REFRESH_EXPIRES_IN ?? "30d",
			algorithm: process.env.JWT_ALGORITHM ?? "HS256",
		}
	}

	static async signToken(payload, strategy = "authStrategy") {
		const { secret, expiresIn, algorithm } =
			Token[strategy] ?? Token.authStrategy

		const token = jwt.sign(payload, secret, {
			expiresIn: expiresIn,
			algorithm: algorithm,
		})

		return token
	}

	static async createAuthToken(payload) {
		const jwt_token = await this.signToken(payload, "authStrategy")

		const session = new Session({
			token: jwt_token,
			username: payload.username,
			user_id: payload.user_id,
			sign_location: payload.sign_location,
			ip_address: payload.ip_address,
			client: payload.client,
			date: new Date().getTime(),
			created_at: new Date().getTime(),
		})

		await session.save()

		return jwt_token
	}

	static async createRefreshToken(user_id, authToken) {
		const jwt_token = await this.signToken(
			{
				user_id,
			},
			"refreshStrategy",
		)

		const refreshRegistry = new RefreshToken({
			authToken: authToken,
			refreshToken: jwt_token,
		})

		await refreshRegistry.save()

		return jwt_token
	}

	static async basicDecode(token) {
		const { secret } = Token.authStrategy

		return new Promise((resolve, reject) => {
			jwt.verify(token, secret, async (err, decoded) => {
				if (err) {
					reject(err)
				}

				resolve(decoded)
			})
		})
	}

	static async validate(token) {
		let result = {
			expired: false,
			valid: true,
			error: null,
			data: null,
		}

		if (typeof token === "undefined") {
			result.valid = false
			result.error = "Missing token"

			return result
		}

		const { secret } = Token.authStrategy

		await jwt.verify(token, secret, async (err, decoded) => {
			if (err) {
				result.valid = false
				result.error = err.message

				if (err.message === "jwt expired") {
					result.expired = true
				}

				return
			}

			result.data = decoded

			// check account tos violation
			const violation = await TosViolations.findOne({
				user_id: decoded.user_id,
			})

			if (violation) {
				console.log("violation", violation)

				result.valid = false
				result.banned = {
					reason: violation.reason,
					expire_at: violation.expire_at,
				}

				return result
			}

			const sessions = await Session.find({ user_id: decoded.user_id })
			const currentSession = sessions.find(
				(session) => session.token === token,
			)

			if (!currentSession) {
				result.valid = false
				result.error = "Session token not found"
			} else {
				result.session = currentSession
				result.valid = true
				result.user = async () =>
					await User.findOne({ _id: decoded.user_id })
			}
		})

		return result
	}

	static async handleRefreshToken(payload) {
		const { authToken, refreshToken } = payload

		if (!authToken || !refreshToken) {
			throw new OperationError(400, "Missing refreshToken or authToken")
		}

		let result = {
			error: undefined,
			token: undefined,
			refreshToken: undefined,
		}

		await jwt.verify(
			refreshToken,
			Token.refreshStrategy.secret,
			async (err, decoded) => {
				if (err) {
					result.error = err.message
					return false
				}

				if (!decoded.user_id) {
					result.error = "Missing user_id"
					return false
				}

				let currentSession = await Session.findOne({
					user_id: decoded.user_id,
					token: authToken,
				}).catch((err) => {
					return null
				})

				if (!currentSession) {
					result.error = "Session not matching with provided token"
					return false
				}

				currentSession = currentSession.toObject()

				await Session.findOneAndDelete({
					_id: currentSession._id.toString(),
				})

				result.token = await this.createAuthToken({
					...currentSession,
					date: new Date().getTime(),
				})
				result.refreshToken = await this.createRefreshToken(
					decoded.user_id,
					result.token,
				)

				return true
			},
		)

		if (result.error) {
			throw new OperationError(401, result.error)
		}

		return result
	}
}