<?php
require_once __DIR__ . '/../db/config.php';
header('Content-Type: application/json');

$data = json_decode(file_get_contents('php://input'), true);
$username = $data['username'] ?? '';
$item = $data['item'] ?? '';
$color = $data['color'] ?? null;

if (empty($username) || empty($item)) {
    echo json_encode(['success' => false, 'error' => 'Datos incompletos']);
    exit;
}

try {
    $pdo = db();
    $stmt = $pdo->prepare("SELECT loyalty_points, chat_color FROM fans WHERE name = ?");
    $stmt->execute([$username]);
    $fan = $stmt->fetch(PDO::FETCH_ASSOC);

    if (!$fan) {
        echo json_encode(['success' => false, 'error' => 'Usuario no encontrado']);
        exit;
    }

    $points = $fan['loyalty_points'];
    $current_color = $fan['chat_color'];

    if ($item === 'god_mode') {
        $cost = 500;
        if ($points < $cost) {
            echo json_encode(['success' => false, 'error' => "Puntos insuficientes ($points/$cost)"]);
            exit;
        }
        
        $new_color = $color ?: '#ffd700'; // Gold default
        $stmt = $pdo->prepare("UPDATE fans SET loyalty_points = loyalty_points - ?, chat_color = ? WHERE name = ?");
        $stmt->execute([$cost, $new_color, $username]);
        
        echo json_encode(['success' => true, 'message' => '¡Modo Dios activado! Ahora tienes un color exclusivo.']);
    } elseif ($item === 'dj_day') {
        $cost = 2000;
        if ($points < $cost) {
            echo json_encode(['success' => false, 'error' => "Puntos insuficientes ($points/$cost)"]);
            exit;
        }
        
        $stmt = $pdo->prepare("UPDATE fans SET loyalty_points = loyalty_points - ?, dj_day_until = DATE_ADD(NOW(), INTERVAL 1 DAY) WHERE name = ?");
        $stmt->execute([$cost, $username]);
        
        echo json_encode(['success' => true, 'message' => '¡Eres DJ por un día! Tu nombre destacará en toda la sala.']);
    } elseif ($item === 'change_color') {
        // If they already have god mode, changing color might be cheaper or free?
        // Let's say 100 points to change color if already bought, or free if we want.
        if (!$current_color) {
            echo json_encode(['success' => false, 'error' => 'Primero debes desbloquear el Modo Dios']);
            exit;
        }
        $cost = 50;
        if ($points < $cost) {
            echo json_encode(['success' => false, 'error' => "Puntos insuficientes ($points/$cost)"]);
            exit;
        }
        $stmt = $pdo->prepare("UPDATE fans SET loyalty_points = loyalty_points - ?, chat_color = ? WHERE name = ?");
        $stmt->execute([$cost, $color, $username]);
        echo json_encode(['success' => true, 'message' => '¡Color actualizado!']);
    } else {
        echo json_encode(['success' => false, 'error' => 'Ítem no reconocido']);
    }

} catch (Exception $e) {
    echo json_encode(['success' => false, 'error' => $e->getMessage()]);
}