import { TRPCError } from "@trpc/server";
import { deleteCookie, setCookie } from "cookies-next";
import { add } from "date-fns";
import type { UsersId } from "~/schemas/public/Users";
import type { Context } from "~/server/api/trpc";
import { signToken } from "~/server/auth/jwt";
import { db } from "~/server/db";
import { isBanned } from "~/server/services/banlist.service";
import {
	comparePasswords,
	generateSalt,
	hashPassword,
} from "~/server/services/password.service";
import {
	addUser,
	findUser_byEmail,
	findUser_byId,
	findUser_byId_MINI,
} from "~/server/services/user.service";
import { checkCtx } from "~/server/utils/ctxChecker";
import { TOKEN_CONFIG } from "../auth/configs";

export const createUserAdmin = async ({
	email,
	password,
	nome,
	cognome,
	telefono,
}: {
	email: string;
	password: string;
	nome: string;
	cognome: string;
	telefono: string;
}) => {
	const banned = await isBanned({ data: { email }, db });
	if (banned) {
		throw new TRPCError({
			code: "FORBIDDEN",
			message: "Utente bannato",
		});
	}

	const salt = generateSalt();
	const hashedPassword = await hashPassword(password, salt);

	const user = await addUser({
		data: {
			cognome: cognome.trim(),
			email,
			isAdminMade: true,
			isVerified: true,
			nome: nome.trim(),
			password: hashedPassword,
			salt,
			telefono,
			username: `${nome.trim()} ${cognome.trim()}`,
		},
		db,
	});
	if (!user) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: "Errore in fase di registrazione",
		});
	}

	return { status: "success" as const };
};

export const logIn = async ({
	email,
	password,
	ctx: { req, res },
}: {
	email: string;
	password: string;
	ctx: Context;
}) => {
	try {
		checkCtx({ req, res });

		// Get the user from the collection
		const user = await findUser_byEmail({ email });

		if (!user) {
			console.error("User not found in login for email:", email);
			throw new TRPCError({
				code: "NOT_FOUND",
				message: "Errore in Login: Utente non trovato",
			});
		}
		//Check if user is blocked or unverified

		if (user.isBlocked) {
			throw new TRPCError({
				code: "FORBIDDEN",
				message: "Errore in Login: Utente bloccato",
			});
		}

		// If Admin and password is "changeme", skip password check
		const skipPwCheck = user.isAdmin && user.password === "changeme";

		if (!skipPwCheck) {
			const passworIsMatch = await comparePasswords({
				hashedPassword: user.password,
				password,
				salt: user.salt,
			});

			if (!passworIsMatch) {
				throw new TRPCError({
					code: "BAD_REQUEST",
					message: "Errore in Login: Invalid email or password",
				});
			}
		}

		const payload = {
			email: user.email,
			id: user.id,
			isAdmin: user.isAdmin,
			isBlocked: user.isBlocked,
			nome: user.nome,
			username: user.username,
		};
		console.log("User authenticated, generating tokens for:", user.email);

		const accessToken = await signToken(
			payload,
			TOKEN_CONFIG.ACCESS_TOKEN_EXPIRY,
			"accessToken",
		);
		const refreshToken = await signToken(
			payload,
			TOKEN_CONFIG.REFRESH_TOKEN_EXPIRY,
			"refreshToken",
		);
		console.log("Generated tokens for user:", user.email);

		try {
			await setCookie(TOKEN_CONFIG.ACCESS_TOKEN_COOKIE_NAME, accessToken, {
				...TOKEN_CONFIG.COOKIE_OPTIONS,
				expires: add(new Date(), {
					minutes: TOKEN_CONFIG.ACCESS_TOKEN_COOKIE_EXPIRY,
				}),
				req,
				res,
			});
			await setCookie(TOKEN_CONFIG.REFRESH_TOKEN_COOKIE_NAME, refreshToken, {
				...TOKEN_CONFIG.COOKIE_OPTIONS,
				expires: add(new Date(), {
					minutes: TOKEN_CONFIG.REFRESH_TOKEN_COOKIE_EXPIRY,
				}),
				req,
				res,
			});
			console.log("Login successful, cookies set.");
			return { status: "success" as const };
		} catch (cookieError) {
			console.error("Error setting cookies:", cookieError);
			throw new TRPCError({
				code: "INTERNAL_SERVER_ERROR",
				message: `Errore durante l'impostazione dei cookies: ${(cookieError as Error).message}`,
			});
		}
	} catch (e) {
		console.error("Login error:", e);
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Errore login: ${(e as Error).message}`,
		});
	}
};

export const swapAuth = async ({
	ctx: { req, res },
	userId,
}: {
	ctx: Context;
	userId: UsersId;
}) => {
	checkCtx({ req, res });
	try {
		const user = await findUser_byId_MINI({ userId });
		if (!user) {
			throw new TRPCError({
				code: "NOT_FOUND",
				message: "Utente non trovato",
			});
		}

		const accessToken = await signToken(
			user,
			TOKEN_CONFIG.ACCESS_TOKEN_EXPIRY,
			"accessToken",
		);
		const refreshToken = await signToken(
			user,
			TOKEN_CONFIG.REFRESH_TOKEN_EXPIRY,
			"refreshToken",
		);

		// Send Access Token in Cookie
		await setCookie(TOKEN_CONFIG.ACCESS_TOKEN_COOKIE_NAME, accessToken, {
			...TOKEN_CONFIG.COOKIE_OPTIONS,
			expires: add(new Date(), {
				minutes: TOKEN_CONFIG.ACCESS_TOKEN_COOKIE_EXPIRY,
			}),
			req,
			res,
		});
		await setCookie(TOKEN_CONFIG.REFRESH_TOKEN_COOKIE_NAME, refreshToken, {
			...TOKEN_CONFIG.COOKIE_OPTIONS,
			expires: add(new Date(), {
				minutes: TOKEN_CONFIG.REFRESH_TOKEN_COOKIE_EXPIRY,
			}),
			req,
			res,
		});
	} catch {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: "Errore interno",
		});
	}
};

export const logOut = async ({ ctx: { req, res } }: { ctx: Context }) => {
	checkCtx({ req, res });
	try {
		await deleteCookie(TOKEN_CONFIG.ACCESS_TOKEN_COOKIE_NAME, { req, res });
		await deleteCookie(TOKEN_CONFIG.REFRESH_TOKEN_COOKIE_NAME, { req, res });
		return { status: "success" };
	} catch (err: unknown) {
		console.error(err);
		throw err;
	}
};

export const passwordChange = async ({
	userId,
	oldpassword,
	newpassword,
}: {
	userId: UsersId;
	oldpassword: string;
	newpassword: string;
}) => {
	const dbUser = await findUser_byId({ id: userId });
	if (!dbUser) {
		throw new TRPCError({
			code: "NOT_FOUND",
			message: "Utente non trovato",
		});
	}
	const banned = await isBanned({ data: { email: dbUser.email }, db });
	if (banned) {
		throw new TRPCError({
			code: "FORBIDDEN",
			message: "Utente bannato",
		});
	}

	const isPasswordCorrect = await comparePasswords({
		hashedPassword: dbUser.password,
		password: oldpassword,
		salt: dbUser.salt,
	});
	if (!isPasswordCorrect) {
		throw new TRPCError({
			code: "BAD_REQUEST",
			message: "Password errata",
		});
	}

	const salt = generateSalt();
	const hashedPassword = await hashPassword(newpassword, salt);
	await db
		.updateTable("users")
		.set({
			password: hashedPassword,
			salt,
		})
		.where("id", "=", userId)
		.execute();
	return {
		status: "success",
	};
};