import { Request, Response } from 'express';
import { pool } from '../db/connection';
import { hashPassword, comparePassword, generateToken, generateRandomToken } from '../utils/auth';

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

    if (!email || !password) {
      return res.status(400).json({
        success: false,
        message: 'Email and password are required'
      });
    }

    const existingUser = await pool.query('SELECT id FROM users WHERE email = $1', [email]);
    if (existingUser.rows.length > 0) {
      return res.status(409).json({
        success: false,
        message: 'User already exists with this email'
      });
    }

    const passwordHash = await hashPassword(password);
    const verificationToken = generateRandomToken();

    const result = await pool.query(
      `INSERT INTO users (email, password_hash, first_name, last_name, verification_token, is_verified)
       VALUES ($1, $2, $3, $4, $5, $6)
       RETURNING id, email, first_name, last_name, role, subscription_plan, subscription_status, created_at`,
      [email, passwordHash, first_name, last_name, verificationToken, false]
    );

    const user = result.rows[0];
    const token = generateToken({
      userId: user.id,
      email: user.email,
      role: user.role,
      subscription_plan: user.subscription_plan
    });

    res.status(201).json({
      success: true,
      token,
      user: {
        id: user.id,
        email: user.email,
        first_name: user.first_name,
        last_name: user.last_name,
        role: user.role,
        subscription_plan: user.subscription_plan,
        subscription_status: user.subscription_status,
        is_verified: false,
        created_at: user.created_at,
        updated_at: user.created_at
      }
    });
  } catch (error) {
    console.error('Signup error:', error);
    res.status(500).json({
      success: false,
      message: 'Internal server error'
    });
  }
};

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

    if (!email || !password) {
      return res.status(400).json({
        success: false,
        message: 'Email and password are required'
      });
    }

    const result = await pool.query(
      'SELECT id, email, password_hash, first_name, last_name, is_verified, role, subscription_plan, subscription_status, created_at, updated_at FROM users WHERE email = $1',
      [email]
    );

    if (result.rows.length === 0) {
      return res.status(401).json({
        success: false,
        message: 'Invalid credentials'
      });
    }

    const user = result.rows[0];
    const isValidPassword = await comparePassword(password, user.password_hash);

    if (!isValidPassword) {
      return res.status(401).json({
        success: false,
        message: 'Invalid credentials'
      });
    }

    const token = generateToken({
      userId: user.id,
      email: user.email,
      role: user.role,
      subscription_plan: user.subscription_plan
    });

    res.json({
      success: true,
      token,
      user: {
        id: user.id,
        email: user.email,
        first_name: user.first_name,
        last_name: user.last_name,
        is_verified: user.is_verified,
        role: user.role,
        subscription_plan: user.subscription_plan,
        subscription_status: user.subscription_status,
        created_at: user.created_at,
        updated_at: user.updated_at
      }
    });
  } catch (error) {
    console.error('Login error:', error);
    res.status(500).json({
      success: false,
      message: 'Internal server error'
    });
  }
};

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

    if (!email) {
      return res.status(400).json({
        success: false,
        message: 'Email is required'
      });
    }

    const user = await pool.query('SELECT id FROM users WHERE email = $1', [email]);
    if (user.rows.length === 0) {
      return res.json({
        success: true,
        message: 'If the email exists, a reset link has been sent'
      });
    }

    const resetToken = generateRandomToken();
    const resetExpires = new Date(Date.now() + 3600000); // 1 hour

    await pool.query(
      'UPDATE users SET reset_password_token = $1, reset_password_expires = $2 WHERE email = $3',
      [resetToken, resetExpires, email]
    );

    // TODO: Send email with reset link
    console.log(`Reset token for ${email}: ${resetToken}`);

    res.json({
      success: true,
      message: 'If the email exists, a reset link has been sent'
    });
  } catch (error) {
    console.error('Reset password error:', error);
    res.status(500).json({
      success: false,
      message: 'Internal server error'
    });
  }
};