<?php
/**
 * CDN API
 * 
 * GET /api/cdn.php?action=url&video_id=X&quality=720p - Get CDN URL
 * GET /api/cdn.php?action=qualities&video_id=X - Get available qualities
 * GET /api/cdn.php?action=bandwidth&days=30 - Get bandwidth usage
 * POST /api/cdn.php?action=upload - Upload to CDN
 * POST /api/cdn.php?action=purge - Purge CDN cache
 */

require_once dirname(__DIR__) . '/f_core/config.boot.php';
require_once dirname(__DIR__) . '/f_core/f_classes/class.cdn.php';

header('Content-Type: application/json');

session_start();
$current_user_id = $_SESSION['user_id'] ?? null;
$cdn = new VCDN();

$action = $_GET['action'] ?? 'url';

// Public endpoints
if ($action === 'url') {
    $video_id = $_GET['video_id'] ?? null;
    $quality = $_GET['quality'] ?? 'original';
    
    if (!$video_id) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Video ID required']);
        exit;
    }
    
    $url = $cdn->getCDNUrl($video_id, $quality);
    
    if ($url) {
        echo json_encode(['success' => true, 'url' => $url]);
    } else {
        http_response_code(404);
        echo json_encode(['success' => false, 'error' => 'Video not found']);
    }
    exit;
}

if ($action === 'qualities') {
    $video_id = $_GET['video_id'] ?? null;
    
    if (!$video_id) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Video ID required']);
        exit;
    }
    
    $qualities = $cdn->getAvailableQualities($video_id);
    echo json_encode(['success' => true, 'qualities' => $qualities]);
    exit;
}

// Authenticated endpoints
if (!$current_user_id) {
    http_response_code(401);
    echo json_encode(['success' => false, 'error' => 'Authentication required']);
    exit;
}

switch ($action) {
    case 'bandwidth':
        $days = intval($_GET['days'] ?? 30);
        $provider_id = $_GET['provider_id'] ?? null;
        
        $data = $cdn->getBandwidthUsage($provider_id, $days);
        echo json_encode(['success' => true, 'data' => $data]);
        break;
        
    case 'upload':
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            http_response_code(405);
            echo json_encode(['success' => false, 'error' => 'Method not allowed']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $video_id = $input['video_id'] ?? null;
        $local_path = $input['local_path'] ?? null;
        $quality = $input['quality'] ?? 'original';
        
        if (!$video_id || !$local_path) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Video ID and local path required']);
            exit;
        }
        
        // Verify ownership
        global $class_database;
        $sql = "SELECT usr_id FROM db_videofiles WHERE video_id = ?";
        $result = $class_database->execute($sql, [$video_id]);
        
        if (!$result || $class_database->rowCount($result) == 0) {
            http_response_code(404);
            echo json_encode(['success' => false, 'error' => 'Video not found']);
            exit;
        }
        
        $row = $class_database->fetch($result);
        
        if ($row['usr_id'] != $current_user_id) {
            http_response_code(403);
            echo json_encode(['success' => false, 'error' => 'Permission denied']);
            exit;
        }
        
        $success = $cdn->uploadVideo($video_id, $local_path, $quality);
        
        echo json_encode(['success' => $success]);
        break;
        
    case 'purge':
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            http_response_code(405);
            echo json_encode(['success' => false, 'error' => 'Method not allowed']);
            exit;
        }
        
        $input = json_decode(file_get_contents('php://input'), true) ?: $_POST;
        
        $video_id = $input['video_id'] ?? null;
        
        if (!$video_id) {
            http_response_code(400);
            echo json_encode(['success' => false, 'error' => 'Video ID required']);
            exit;
        }
        
        // Verify ownership
        global $class_database;
        $sql = "SELECT usr_id FROM db_videofiles WHERE video_id = ?";
        $result = $class_database->execute($sql, [$video_id]);
        
        if (!$result || $class_database->rowCount($result) == 0) {
            http_response_code(404);
            echo json_encode(['success' => false, 'error' => 'Video not found']);
            exit;
        }
        
        $row = $class_database->fetch($result);
        
        if ($row['usr_id'] != $current_user_id) {
            http_response_code(403);
            echo json_encode(['success' => false, 'error' => 'Permission denied']);
            exit;
        }
        
        $cdn->purgeCache($video_id);
        
        echo json_encode(['success' => true]);
        break;
        
    default:
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Invalid action']);
}