<?php
session_start();
require_once 'db/config.php';
require_once 'includes/flash_messages.php';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $email = $_POST['email'];
    $password = $_POST['password'];

    try {
        $pdo = db();
        $stmt = $pdo->prepare('SELECT id, password_hash FROM users WHERE email = ?');
        $stmt->execute([$email]);
        $user = $stmt->fetch();

        if ($user && password_verify($password, $user['password_hash'])) {
            $_SESSION['user_id'] = $user['id'];
            set_flash_message('You have been successfully logged in.', 'success');
            header("Location: index.php");
            exit;
        } else {
            set_flash_message('Invalid email or password.', 'danger');
            header("Location: login.php");
            exit;
        }
    } catch (PDOException $e) {
        set_flash_message('Database error. Please try again.', 'danger');
        error_log("Login DB Error: " . $e->getMessage());
        header("Location: login.php");
        exit;
    }
}