import bcrypt from 'bcrypt';
import crypto from 'crypto';
import { v4 as uuidv4 } from 'uuid';
import User from '../models/community/user.js';
import UserParam from '../models/community/user_param.js';
import UserParamType from '../models/type/user_param.js';
import { sendAccountActivationEmail, sendPasswordResetEmail } from './emailService.js';
import { sequelize } from '../utils/sequelize.js';

const saltRounds = 10;

export const registerUser = async ({ email, username, password, language }) => {
    const encryptionKey = process.env.SECRET_KEY;
    const results = await sequelize.query(
        `SELECT * FROM community.user WHERE pgp_sym_decrypt(email::bytea, :key) = :email`,
        {
            replacements: { key: encryptionKey, email },
            type: sequelize.QueryTypes.SELECT
        }
    );
    if (results.length > 0) {
        throw new Error('emailinuse');
    }
    const hashedPassword = await bcrypt.hash(password, saltRounds);
    const resetToken = uuidv4();
    const user = await User.create({
        email: email,
        username,
        password: hashedPassword,
        resetToken: resetToken,
        active: false,
        registration_date: new Date()
    });

    const languageType = await UserParamType.findOne({ where: { description: 'language' } });
    if (!languageType) {
        throw new Error('languagenotfound');
    }

    const languageParam = await UserParam.create({
        userId: user.id,
        paramTypeId: languageType.id,
        value: language
    });

    const activationLink = `${process.env.FRONTEND_URL}/activate?token=${resetToken}`;
    await sendAccountActivationEmail(email, activationLink, username, resetToken, language);
    const authCode = crypto.randomBytes(20).toString('hex');

    return { id: user.hashedId, username: user.username, active: user.active, param: [languageParam], authCode };
};

export const loginUser = async ({ username, password }) => {
    const user = await User.findOne({ where: { username } });
    if (!user) {
        throw new Error('credentialsinvalid');
    }
    const match = await bcrypt.compare(password, user.password);
    if (!match) {
        throw new Error('credentialsinvalid');
    }
    const authCode = crypto.randomBytes(20).toString('hex');
    user.authCode = authCode;
    await user.save();
    const params = await UserParam.findAll({
        where: {
            userId: user.id
        },
        include: {
            model: UserParamType,
            as: 'paramType',
            where: {
                description: ['birthdate', 'gender', 'language']
            }
        }
    });
    const mappedParams = params.map(param => {
        return { 'name': param.paramType.description, 'value': param.value };
    });
    return {
        id: user.hashedId,
        username: user.username,
        active: user.active,
        param: mappedParams,
        authCode
    };
};

export const handleForgotPassword = async ({ email }) => {
    const user = await User.findOne({ where: { email } });
    if (!user) {
        throw new Error('Email not found');
    }
    const resetToken = uuidv4();
    const resetLink = `${process.env.FRONTEND_URL}/reset-password?token=${resetToken}`;
    await user.update({ reset_token: resetToken });
    const languageParam = await UserParam.findOne({ where: { user_id: user.id, param_type_id: languageType.id } });
    const userLanguage = languageParam ? languageParam.value : 'en';
    await sendPasswordResetEmail(email, resetLink, userLanguage);
    return { message: 'Password reset email sent' };
};

export const activateUserAccount = async ({ token }) => {
    const user = await User.findOne({ where: { reset_token: token } });
    if (!user) {
        throw new Error('Invalid token');
    }
    await user.update({ active: true, reset_token: null });
    return { message: 'Account activated' };
};