const {
    registrationBodyValidation,
    loginValidation,
    editUserParamValidation,
    editUserBodyValidation,
    recoveryValidation,
    recoveryTokenValidation,
    newPasswordValidation,
} = require("../validation/joi");
const logger = require("../utils/logger");
require("dotenv").config();
const {errorMessages, successMessages} = require("../utils/messages");
const jwt = require("jsonwebtoken");
const SERVICE_NAME = "AuthController";
const {getTokenFromHeaders} = require("../utils/utils");
const crypto = require("crypto");

/**
 * Creates and returns JWT token with an arbitrary payload
 * @function
 * @param {Object} payload
 * @param {Object} appSettings
 * @returns {String}
 * @throws {Error}
 */
const issueToken = (payload, appSettings) => {
    try {
        const tokenTTL = appSettings.jwtTTL ? appSettings.jwtTTL : "2h";
        return jwt.sign(payload, appSettings.jwtSecret, {expiresIn: tokenTTL});
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "issueToken") : null;
        throw error;
    }
};

/**
 * Registers a new user. If the user is the first account, a JWT secret is created. If not, an invite token is required.
 * @async
 * @param {Object} req - The Express request object.
 * @property {Object} req.body - The body of the request.
 * @property {string} req.body.inviteToken - The invite token for registration.
 * @property {Object} req.file - The file object for the user's profile image.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status, a message indicating the creation of the user, the created user data, and a JWT token.
 * @throws {Error} If there is an error during the process, especially if there is a validation error (422).
 */
const registerUser = async (req, res, next) => {
    // joi validation
    try {
        await registrationBodyValidation.validateAsync(req.body);
    } catch (error) {
        error.status = 422;
        error.service = SERVICE_NAME;
        error.message = error.details?.[0]?.message || error.message || "Validation Error";
        next(error);
        return;
    }
    // Create a new user
    try {
        const {inviteToken} = req.body;
        // If superAdmin exists, a token should be attached to all further register requests
        const superAdminExists = await req.db.checkSuperadmin(req, res);
        if (superAdminExists) {
            await req.db.getInviteTokenAndDelete(inviteToken);
        } else {
            // This is the first account, create JWT secret to use if one is not supplied by env
            const jwtSecret = crypto.randomBytes(64).toString("hex");
            await req.db.updateAppSettings({jwtSecret});
        }

        const newUser = await req.db.insertUser({...req.body}, req.file);
        logger.info(successMessages.AUTH_CREATE_USER, {
            service: SERVICE_NAME, userId: newUser._id,
        });

        const userForToken = {...newUser._doc};
        delete userForToken.profileImage;
        delete userForToken.avatarImage;

        const appSettings = await req.settingsService.getSettings();
        const token = issueToken(userForToken, appSettings);
        req.emailService
            .buildAndSendEmail("welcomeEmailTemplate", {name: newUser.firstName}, newUser.email, "Welcome to Uptime Monitor")
            .catch((error) => {
                logger.error("Error sending welcome email", {
                    service: SERVICE_NAME, error: error.message,
                });
            });

        return res.status(200).json({
            success: true, msg: successMessages.AUTH_CREATE_USER, data: {user: newUser, token: token},
        });
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "registerController") : null;
        next(error);
    }
};

/**
 * Logs in a user by validating the user's credentials and issuing a JWT token.
 * @async
 * @param {Object} req - The Express request object.
 * @property {Object} req.body - The body of the request.
 * @property {string} req.body.email - The email of the user.
 * @property {string} req.body.password - The password of the user.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status, a message indicating the login of the user, the user data (without password and avatar image), and a JWT token.
 * @throws {Error} If there is an error during the process, especially if there is a validation error (422) or the password is incorrect.
 */
const loginUser = async (req, res, next) => {
    try {
        await loginValidation.validateAsync(req.body);
    } catch (error) {
        error.status = 422;
        error.service = SERVICE_NAME;
        error.message = error.details?.[0]?.message || error.message || "Validation Error";
        next(error);
        return;
    }
    try {
        const {email, password} = req.body;
        // Check if user exists
        const user = await req.db.getUserByEmail(email);

        // Compare password
        const match = await user.comparePassword(password);
        if (match !== true) {
            next(new Error(errorMessages.AUTH_INCORRECT_PASSWORD));
            return;
        }

        // Remove password from user object.  Should this be abstracted to DB layer?
        const userWithoutPassword = {...user._doc};
        delete userWithoutPassword.password;
        delete userWithoutPassword.avatarImage;

        // Happy path, return token
        const appSettings = req.settingsService.getSettings();
        const token = issueToken(userWithoutPassword, appSettings);
        // reset avatar image
        userWithoutPassword.avatarImage = user.avatarImage;

        return res.status(200).json({
            success: true, msg: successMessages.AUTH_LOGIN_USER, data: {user: userWithoutPassword, token: token},
        });
    } catch (error) {
        error.status = 500;
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "loginController") : null;
        next(error);
    }
};

/**
 * Edits a user's information. If the user wants to change their password, the current password is checked before updating to the new password.
 * @async
 * @param {Object} req - The Express request object.
 * @property {Object} req.params - The parameters of the request.
 * @property {string} req.params.userId - The ID of the user to be edited.
 * @property {Object} req.body - The body of the request.
 * @property {string} req.body.password - The current password of the user.
 * @property {string} req.body.newPassword - The new password of the user.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status, a message indicating the update of the user, and the updated user data.
 * @throws {Error} If there is an error during the process, especially if there is a validation error (422), the user is unauthorized (401), or the password is incorrect (403).
 */
const editUser = async (req, res, next) => {
    try {
        await editUserParamValidation.validateAsync(req.params);
        await editUserBodyValidation.validateAsync(req.body);
    } catch (error) {
        error.status = 422;
        error.service = SERVICE_NAME;
        error.message = error.details?.[0]?.message || error.message || "Validation Error";
        next(error);
        return;
    }

    // TODO is this neccessary any longer? Verify ownership middleware should handle this
    if (req.params.userId !== req.user._id.toString()) {
        const error = new Error(errorMessages.AUTH_UNAUTHORIZED);
        error.status = 401;
        error.service = SERVICE_NAME;
        next(error);
        return;
    }

    try {
        // Change Password check
        if (req.body.password && req.body.newPassword) {
            // Get token from headers
            const token = getTokenFromHeaders(req.headers);
            // Get email from token
            const {jwtSecret} = req.settingsService.getSettings();
            const {email} = jwt.verify(token, jwtSecret);
            // Add user email to body for DB operation
            req.body.email = email;
            // Get user
            const user = await req.db.getUserByEmail(email);
            // Compare passwords
            const match = await user.comparePassword(req.body.password);
            // If not a match, throw a 403
            if (!match) {
                const error = new Error(errorMessages.AUTH_INCORRECT_PASSWORD);
                error.status = 403;
                next(error)
                return;
            }
            // If a match, update the password
            req.body.password = req.body.newPassword;
        }

        const updatedUser = await req.db.updateUser(req, res);
        return res.status(200).json({
            success: true, msg: successMessages.AUTH_UPDATE_USER, data: updatedUser,
        });
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "userEditController") : null;
        next(error);
    }
};

/**
 * Checks if a superadmin account exists in the database.
 * @async
 * @param {Object} req - The Express request object.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status, a message indicating the existence of a superadmin, and a boolean indicating the existence of a superadmin.
 * @throws {Error} If there is an error during the process.
 */
const checkSuperAdminExists = async (req, res, next) => {
    try {
        const superAdminExists = await req.db.checkSuperadmin(req, res);
        return res.status(200).json({
            success: true, msg: successMessages.AUTH_ADMIN_EXISTS, data: superAdminExists,
        });
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "checkSuperadminController") : null;
        next(error);
    }
};

/**
 * Requests a recovery token for a user. The user's email is validated and a recovery token is created and sent via email.
 * @async
 * @param {Object} req - The Express request object.
 * @property {Object} req.body - The body of the request.
 * @property {string} req.body.email - The email of the user requesting recovery.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status, a message indicating the creation of the recovery token, and the message ID of the sent email.
 * @throws {Error} If there is an error during the process, especially if there is a validation error (422).
 */
const requestRecovery = async (req, res, next) => {
    try {
        await recoveryValidation.validateAsync(req.body);
    } catch (error) {
        error.status = 422;
        error.service = SERVICE_NAME;
        error.message = error.details?.[0]?.message || error.message || "Validation Error";
        next(error);
        return;
    }

    try {
        const {email} = req.body;
        const user = await req.db.getUserByEmail(email);
        if (user) {
            const recoveryToken = await req.db.requestRecoveryToken(req, res);
            const name = user.firstName;
            const email = req.body.email;
            const {clientHost} = req.settingsService.getSettings();
            const url = `${clientHost}/set-new-password/${recoveryToken.token}`;

            const msgId = await req.emailService.buildAndSendEmail("passwordResetTemplate", {
                name,
                email,
                url
            }, email, "Bluewave Uptime Password Reset");

            return res.status(200).json({
                success: true, msg: successMessages.AUTH_CREATE_RECOVERY_TOKEN, data: msgId,
            });
        }
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "recoveryRequestController") : null;
        next(error);
    }
};

/**
 * Validates a recovery token. The recovery token is validated and if valid, a success message is returned.
 * @async
 * @param {Object} req - The Express request object.
 * @property {Object} req.body - The body of the request.
 * @property {string} req.body.token - The recovery token to be validated.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status and a message indicating the validation of the recovery token.
 * @throws {Error} If there is an error during the process, especially if there is a validation error (422).
 */
const validateRecovery = async (req, res, next) => {
    try {
        await recoveryTokenValidation.validateAsync(req.body);
    } catch (error) {
        error.status = 422;
        error.service = SERVICE_NAME;
        error.message = error.details?.[0]?.message || error.message || "Validation Error";
        next(error);
        return;
    }

    try {
        await req.db.validateRecoveryToken(req, res);
        return res.status(200).json({
            success: true, msg: successMessages.AUTH_VERIFY_RECOVERY_TOKEN,
        });
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "validateRecoveryTokenController") : null;
        next(error);
    }
};

/**
 * Resets a user's password. The new password is validated and if valid, the user's password is updated in the database and a new JWT token is issued.
 * @async
 * @param {Object} req - The Express request object.
 * @property {Object} req.body - The body of the request.
 * @property {string} req.body.token - The recovery token.
 * @property {string} req.body.password - The new password of the user.
 * @param {Object} res - The Express response object.
 * @param {function} next - The next middleware function.
 * @returns {Object} The response object with a success status, a message indicating the reset of the password, the updated user data (without password and avatar image), and a new JWT token.
 * @throws {Error} If there is an error during the process, especially if there is a validation error (422).
 */
const resetPassword = async (req, res, next) => {
    try {
        await newPasswordValidation.validateAsync(req.body);
    } catch (error) {
        error.status = 422;
        error.service = SERVICE_NAME;
        error.message = error.details?.[0]?.message || error.message || "Validation Error";
        next(error);
        return;
    }
    try {
        const user = await req.db.resetPassword(req, res);

        const appSettings = await req.settingsService.getSettings();
        const token = issueToken(user._doc, appSettings);
        res.status(200).json({
            success: true, msg: successMessages.AUTH_RESET_PASSWORD, data: {user, token},
        });
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "resetPasswordController") : null;
        next(error);
    }
};

/**
 * Deletes a user and all associated monitors, checks, and alerts.
 *
 * @param {Object} req - The request object.
 * @param {Object} res - The response object.
 * @param {Function} next - The next middleware function.
 * @returns {Object} The response object with success status and message.
 * @throws {Error} If user validation fails or user is not found in the database.
 */
const deleteUser = async (req, res, next) => {
    try {
        const token = getTokenFromHeaders(req.headers);
        const decodedToken = jwt.decode(token);
        const {email} = decodedToken;

        // Check if the user exists
        const user = await req.db.getUserByEmail(email);
        if (!user) {
            next(new Error(errorMessages.DB_USER_NOT_FOUND));
            return;
        }

        // 1. Find all the monitors associated with the team ID if superadmin

        const result = await req.db.getMonitorsByTeamId({
            params: {teamId: user.teamId},
        });
        if (user.role.includes("superadmin")) {
            //2.  Remove all jobs, delete checks and alerts
            result?.monitors.length > 0 && (await Promise.all(result.monitors.map(async (monitor) => {
                await req.jobQueue.deleteJob(monitor);
                await req.db.deleteChecks(monitor._id);
                await req.db.deletePageSpeedChecksByMonitorId(monitor._id);
                await req.db.deleteNotificationsByMonitorId(monitor._id);
            })));

            // 3. Delete team
            await req.db.deleteTeam(user.teamId);
            // 4. Delete all other team members
            await req.db.deleteAllOtherUsers();
            // 5. Delete each monitor
            await req.db.deleteMonitorsByUserId(user._id);
        }
        // 6. Delete the user by id
        await req.db.deleteUser(user._id);

        return res.status(200).json({
            success: true, msg: successMessages.AUTH_DELETE_USER,
        });
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "deleteUserController") : null;
        next(error);
    }
};

const getAllUsers = async (req, res) => {
    try {
        const allUsers = await req.db.getAllUsers(req, res);
        res
            .status(200)
            .json({success: true, msg: "Got all users", data: allUsers});
    } catch (error) {
        error.service === undefined ? (error.service = SERVICE_NAME) : null;
        error.method === undefined ? (error.method = "getAllUsersController") : null;
        next(error);
    }
};

module.exports = {
    registerUser,
    loginUser,
    editUser,
    checkSuperadminExists: checkSuperAdminExists,
    requestRecovery,
    validateRecovery,
    resetPassword,
    deleteUser,
    getAllUsers,
};