import { Request, Response } from 'express';
import User from '../models/users';
import { comparePassword, hashPassword } from '../utils/passwordUtils';
import { generateToken } from '../utils/jwtUtils';
import { logger } from '../utils/logger';
import { sendMail } from '../utils/mailer';
import { generateResetToken } from '../utils/tokenUtils';
import { Op } from 'sequelize';
import { AuthenticatedRequest } from 'shared/interfaces/user.interface';

export const login = async (req: Request, res: Response) => {
    
    try {

        const { email, password } = req.body;

        const user = await User.findOne({
            where: {
              email: email,
            },
          })

        if (!user) {
            return res.status(401).json({ error: 'Invalid Credentials' });
        }
        
        const passwordMatch = await comparePassword(password, user.password);
        
        if (!passwordMatch) {
            return res.status(401).json({ error: 'Invalid Credentials' });
        }
        
        if (user.status === 'inactive') {
            return res.status(403).json({ error: 'Forbidden' });
        }

        const payload = {
            id: user.id,
            name: user.name,
            email: user.email,
            role_id: user.role_id
        }

        const token = generateToken(payload);

        return res.status(200).json({ token: token });

    } catch (error) {
        logger.error("Error logging in: ");
        logger.error(error);
        return res.status(500).json({ error: 'Internal server error' });
    }

}

export const forgotPassword = async (req: Request, res: Response) => {
    try {
        const { email } = req.body;

        const user = await User.findOne({
            where: { email }
        });

        if (!user) {
            return res.status(404).json({ error: 'User not found' });
        }

        const resetToken = generateResetToken();
        const resetTokenExpiry = new Date(Date.now() + 3600000);

        await user.update({
            reset_token: resetToken,
            reset_token_expiry: resetTokenExpiry
        });
        const resetLink = `${process.env.APP_URL}reset-password?token=${resetToken}`;

        sendMail({
            subject: 'Your password reset link',
            to: email,
            content: `<p><b>Dear ${user.name},</b></p>
                    <p>Click the link below to reset your password:</p>
                    <p><a href="${resetLink}">Reset Your Password</a></p>
                    <p>Link will expire within 1 hour.</p>
                    <p>Best regards,<br>Team Fusion Bills</p>`
        })
        return res.status(200).json({ message: 'Password reset email sent successfully' });

    } catch (error) {
        logger.error("Error in forgot password: ");
        logger.error(error);
        return res.status(500).json({ error: 'Internal server error' });
    }
}

export const resetPassword = async (req: Request, res: Response) => {
    try {
        const { token, newPassword } = req.body;

        const user = await User.findOne({
            where: { 
                reset_token: token,
                reset_token_expiry: { [Op.gt]: new Date() }
            }
        });

        if (!user) {
            return res.status(400).json({ error: 'Invalid or expired token' });
        }   

        const hashedPassword = await hashPassword(newPassword);

        await user.update({
            password: hashedPassword,
            reset_token: null,
            reset_token_expiry: null
        });

        return res.status(200).json({ message: 'Password reset successfully' });

    } catch (error) {
        logger.error("Error in reset password: ");
        logger.error(error);
        return res.status(500).json({ error: 'Internal server error' });
    }
}

export const changePassword = async (req: AuthenticatedRequest, res: Response) => {
    try {
        const { currentPassword, newPassword, confirmPassword } = req.body;

        const userId = req.user?.id;
        if (!userId) {
            return res.status(401).json({ error: 'Unauthorized' });
        }

        const user = await User.findByPk(userId);
        if (!user) {
            return res.status(404).json({ error: 'User not found' });
        }

        const isPasswordCorrect = await comparePassword(currentPassword, user.password);
        if (!isPasswordCorrect) {
            return res.status(400).json({ error: 'Invalid current password' });
        }

        if (newPassword !== confirmPassword) {
            return res.status(400).json({ error: 'New passwords do not match' });
        }

        if (newPassword.length < 8) {
            return res.status(400).json({ error: 'Password must be at least 8 characters long.' });
        }

        const hashedPassword = await hashPassword(newPassword);
        user.password = hashedPassword;
        await user.save();


        return res.status(200).json({ message: 'Password changed successfully' });

    } catch (error) {
        logger.error("Error changing password: ");
        logger.error(error);
        return res.status(500).json({ error: 'Internal server error' });
    }
}