<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, DELETE');
header('Access-Control-Allow-Headers: Content-Type');

// Load data from JSON file
$dataFile = __DIR__ . '/../backend/data.json';

function loadData() {
    global $dataFile;
    if (!file_exists($dataFile)) {
        return ['error' => 'Data file not found'];
    }
    $json = file_get_contents($dataFile);
    return json_decode($json, true);
}

function saveData($data) {
    global $dataFile;
    file_put_contents($dataFile, json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));
}

// Get action from URL
$action = isset($_GET['action']) ? $_GET['action'] : '';
$method = $_SERVER['REQUEST_METHOD'];

switch ($action) {
    case 'data':
        echo json_encode(loadData());
        break;

    case 'build':
        if ($method === 'POST') {
            $input = json_decode(file_get_contents('php://input'), true);

            $omgJobNumber = $input['omg_job_number'] ?? '';
            $brandCode = strtoupper($input['brand_code'] ?? '');
            $countryCode = strtoupper($input['country_code'] ?? '');
            $languageCode = strtolower($input['language_code'] ?? '');
            $subjectTitle = strtoupper($input['subject_title'] ?? '');
            // Convert underscores to hyphens in subject title
            $subjectTitle = str_replace('_', '-', $subjectTitle);
            $assetType = strtoupper($input['asset_type'] ?? '');
            $spotVersion = strtoupper($input['spot_version'] ?? '');
            $seconds = $input['seconds'] ?? '';
            $aspectRatio = $input['aspect_ratio'] ?? '';
            $hasMaster = $input['has_master'] ?? false;

            // Validation
            $errors = [];

            if (empty($omgJobNumber) || !ctype_digit($omgJobNumber) || strlen($omgJobNumber) > 10) {
                $errors[] = 'OMG Job Number is required, must be numbers only, and max 10 digits';
            }

            if (empty($brandCode) || strlen($brandCode) < 2 || strlen($brandCode) > 5) {
                $errors[] = 'Brand code must be 2-5 characters';
            }

            if (empty($countryCode) || strlen($countryCode) != 2) {
                $errors[] = 'Country code must be exactly 2 characters';
            }

            if (empty($languageCode) || (strlen($languageCode) != 2 && strlen($languageCode) != 3)) {
                $errors[] = 'Language code is required and must be 2-3 characters';
            }

            if (empty($subjectTitle) || strlen($subjectTitle) > 15) {
                $errors[] = 'Subject title is required and must be max 15 characters';
            }

            if (empty($assetType) || strlen($assetType) != 3) {
                $errors[] = 'Asset type must be exactly 3 characters';
            }

            // Validate spot version - must be 3 characters if provided
            if (!empty($spotVersion) && strlen($spotVersion) != 3) {
                $errors[] = 'Spot Version must be exactly 3 characters if provided (e.g., 001, 002, V01)';
            }

            if (empty($seconds)) {
                $errors[] = 'Duration in seconds is required';
            }

            if (empty($aspectRatio)) {
                $errors[] = 'Aspect ratio is required';
            }

            if (!empty($errors)) {
                echo json_encode(['error' => implode(', ', $errors)]);
                exit;
            }

            // Build filename - start with OMG Job Number, then brand, country, language
            $parts = [$omgJobNumber, $brandCode, $countryCode, $languageCode, $subjectTitle, $assetType];

            // Add spot version and MST if applicable
            if ($hasMaster && !empty($spotVersion)) {
                $parts[] = $spotVersion . '_MST';
            } elseif (!empty($spotVersion)) {
                $parts[] = $spotVersion;
            } elseif ($hasMaster) {
                $parts[] = 'MST';
            }

            // Add duration
            $parts[] = $seconds . 'S';

            // Add aspect ratio
            $parts[] = $aspectRatio;

            $filename = implode('_', $parts);

            echo json_encode(['filename' => $filename]);
        }
        break;

    case 'decode':
        if ($method === 'POST') {
            $input = json_decode(file_get_contents('php://input'), true);
            $filename = $input['filename'] ?? '';

            if (empty($filename)) {
                echo json_encode(['error' => 'Filename is required']);
                exit;
            }

            // Remove file extension if present
            $filename = preg_replace('/\.[^.]+$/', '', $filename);

            // Split by underscore
            $parts = explode('_', $filename);

            if (count($parts) < 8) {
                echo json_encode(['error' => 'Invalid filename format. Expected at least 8 parts separated by underscores (including language code)']);
                exit;
            }

            // Parse components (with OMG Job Number at start and language code after country)
            $result = [
                'omg_job_number' => $parts[0],
                'brand_code' => $parts[1],
                'country_code' => $parts[2],
                'language_code' => $parts[3],
                'subject_title' => $parts[4],
                'asset_type' => $parts[5],
                'spot_version' => '',
                'has_master' => false,
                'seconds' => '',
                'aspect_ratio' => ''
            ];

            // Handle optional spot version and MST
            $currentIndex = 6;

            while ($currentIndex < count($parts)) {
                $part = $parts[$currentIndex];

                // Check if it's the duration (ends with S and has numbers)
                if (preg_match('/^\d+S$/', $part)) {
                    $result['seconds'] = rtrim($part, 'S');
                    $currentIndex++;
                    break;
                }
                // Check if it's MST
                elseif ($part === 'MST') {
                    $result['has_master'] = true;
                    $currentIndex++;
                }
                // Otherwise it's a spot version
                else {
                    $result['spot_version'] = $part;
                    $currentIndex++;
                }
            }

            // Last part should be aspect ratio
            if ($currentIndex < count($parts)) {
                $result['aspect_ratio'] = $parts[$currentIndex];
            }

            // Load data to get full names
            $data = loadData();

            $result['brand_name'] = $data['brands'][$result['brand_code']] ?? 'Unknown Brand';
            $result['country_name'] = $data['countries'][$result['country_code']] ?? 'Unknown Country';
            $result['language_name'] = $data['languages'][$result['language_code']] ?? 'Unknown Language';
            $result['asset_type_name'] = $data['asset_types'][$result['asset_type']] ?? 'Unknown Asset Type';

            echo json_encode($result);
        }
        break;

    case 'brands':
        if ($method === 'GET') {
            $data = loadData();
            echo json_encode($data['brands']);
        } elseif ($method === 'POST') {
            $input = json_decode(file_get_contents('php://input'), true);
            $code = strtoupper($input['code'] ?? '');
            $name = $input['name'] ?? '';

            if (empty($code) || empty($name)) {
                echo json_encode(['error' => 'Code and name are required']);
                exit;
            }

            if (strlen($code) < 2 || strlen($code) > 5) {
                echo json_encode(['error' => 'Brand code must be 2-5 characters']);
                exit;
            }

            $data = loadData();
            $data['brands'][$code] = $name;
            saveData($data);

            echo json_encode(['message' => 'Brand added successfully', 'code' => $code, 'name' => $name]);
        }
        break;

    case 'countries':
        if ($method === 'GET') {
            $data = loadData();
            echo json_encode($data['countries']);
        } elseif ($method === 'POST') {
            $input = json_decode(file_get_contents('php://input'), true);
            $code = strtoupper($input['code'] ?? '');
            $name = $input['name'] ?? '';

            if (empty($code) || empty($name)) {
                echo json_encode(['error' => 'Code and name are required']);
                exit;
            }

            if (strlen($code) != 2) {
                echo json_encode(['error' => 'Country code must be exactly 2 characters']);
                exit;
            }

            $data = loadData();
            $data['countries'][$code] = $name;
            saveData($data);

            echo json_encode(['message' => 'Country added successfully', 'code' => $code, 'name' => $name]);
        }
        break;

    case 'asset-types':
        if ($method === 'GET') {
            $data = loadData();
            echo json_encode($data['asset_types']);
        } elseif ($method === 'POST') {
            $input = json_decode(file_get_contents('php://input'), true);
            $code = strtoupper($input['code'] ?? '');
            $name = $input['name'] ?? '';

            if (empty($code) || empty($name)) {
                echo json_encode(['error' => 'Code and name are required']);
                exit;
            }

            if (strlen($code) != 3) {
                echo json_encode(['error' => 'Asset type code must be exactly 3 characters']);
                exit;
            }

            $data = loadData();
            $data['asset_types'][$code] = $name;
            saveData($data);

            echo json_encode(['message' => 'Asset type added successfully', 'code' => $code, 'name' => $name]);
        }
        break;

    case 'languages':
        if ($method === 'GET') {
            $data = loadData();
            echo json_encode($data['languages']);
        } elseif ($method === 'POST') {
            $input = json_decode(file_get_contents('php://input'), true);
            $code = strtolower($input['code'] ?? '');
            $name = $input['name'] ?? '';

            if (empty($code) || empty($name)) {
                echo json_encode(['error' => 'Code and name are required']);
                exit;
            }

            if (strlen($code) < 2 || strlen($code) > 3) {
                echo json_encode(['error' => 'Language code must be 2-3 characters']);
                exit;
            }

            $data = loadData();
            $data['languages'][$code] = $name;
            saveData($data);

            echo json_encode(['message' => 'Language added successfully', 'code' => $code, 'name' => $name]);
        }
        break;

    default:
        echo json_encode(['error' => 'Invalid action']);
        break;
}
?>