<?php
defined($security_key) or exit;

//------------------------------------------
// Software Versions Management
//------------------------------------------
//Connect to DB
$pdo = dbConnect($dbname);

//CONTENT FROM API (POST)
$post_content = json_decode($input,true);

//SoldTo is empty
if (empty($partner->soldto) || $partner->soldto == ''){$soldto_search = '%';} else {$soldto_search = '-%';}

//default whereclause
list($whereclause,$condition) = getWhereclause('',$permission,$partner,'');

// Handle different actions
$action = $post_content['action'] ?? '';

switch ($action) {
    case 'download':
        // Handle secure download request
        require_once './includes/version_access.php';

        $versionId = $post_content['version_id'] ?? null;

        if (!$versionId) {
            http_response_code(400);
            echo json_encode(['error' => 'Missing version_id']);
            exit;
        }

        $userId = $user_data['id'];

        // Validate user has access to this version
        if (!validateUserAccess($userId, $versionId)) {
            http_response_code(403);
            echo json_encode(['error' => 'Access denied. Payment required or insufficient permissions.']);
            exit;
        }

        // Get version details
        $stmt = $pdo->prepare("SELECT * FROM software_versions WHERE rowID = ?");
        $stmt->execute([$versionId]);
        $version = $stmt->fetch(PDO::FETCH_ASSOC);

        if (!$version) {
            http_response_code(404);
            echo json_encode(['error' => 'Version not found']);
            exit;
        }

        // Log the download
        logDownload($pdo, $userId, $versionId);

        // Generate temporary signed URL
        $downloadToken = generateSecureDownloadToken($pdo, $userId, $versionId);

        echo json_encode([
            'download_url' => '/api/v2/get/software_download.php?token=' . $downloadToken,
            'expires_in' => 300 // 5 minutes
        ]);
        break;

    case 'purchase':
        // Handle purchase/license grant
        require_once './includes/version_access.php';

        $versionId = $post_content['version_id'] ?? null;
        $transactionId = $post_content['transaction_id'] ?? null;

        if (!$versionId) {
            http_response_code(400);
            echo json_encode(['error' => 'Missing version_id']);
            exit;
        }

        $userId = $user_data['id'];

        // Verify payment was successful (integrate with your payment processor)
        $paymentVerified = true; // For testing - integrate with actual payment verification

        if (!$paymentVerified) {
            http_response_code(400);
            echo json_encode(['error' => 'Payment verification failed']);
            exit;
        }

        // Check access requirements
        $accessInfo = checkVersionAccess($userId, $versionId);

        if ($accessInfo['accessible']) {
            // Already has access
            echo json_encode([
                'success' => true,
                'message' => 'You already have access to this version',
                'license_granted' => false
            ]);
            exit;
        }

        if (!$accessInfo['requires_payment']) {
            // Shouldn't need payment
            http_response_code(400);
            echo json_encode(['error' => 'This version does not require payment']);
            exit;
        }

        // Grant license
        $success = grantLicense($pdo, $userId, $versionId, $transactionId);

        if ($success) {
            echo json_encode([
                'success' => true,
                'message' => 'License granted successfully',
                'license_granted' => true
            ]);
        } else {
            http_response_code(500);
            echo json_encode(['error' => 'Failed to grant license']);
        }
        break;

    default:
        // Handle CRUD operations for software versions (admin only)
        if (!isAllowed('software', $profile, $permission, 'C') &&
            !isAllowed('software', $profile, $permission, 'U') &&
            !isAllowed('software', $profile, $permission, 'D')) {
            http_response_code(403);
            echo json_encode(['error' => 'Insufficient permissions']);
            exit;
        }

        //SET PARAMETERS FOR QUERY
        $id = $post_content['id'] ?? ''; //check for id
        $command = ($id == '')? 'insert' : 'update';  //IF id = empty then INSERT
        if (isset($post_content['delete'])){$command = 'delete';} //change command to delete
        $date = date('Y-m-d H:i:s');

        //CREATE EMPTY STRINGS
        $clause = '';
        $clause_insert ='';
        $input_insert = '';

        //ADD STANDARD PARAMETERS TO ARRAY BASED ON INSERT OR UPDATE
        if ($command == 'update'){
            $post_content['updated'] = $date;
            $post_content['updatedby'] = $username;
        }
        elseif ($command == 'insert'){
            $post_content['created'] = $date;
            $post_content['createdby'] = $username;
        }

        //BUILD UP CLAUSE
        $execute_input = [];
        foreach ($post_content as $key => $value) {
            if ($key == 'action' || $key == 'id' || $key == 'delete') continue;

            if ($command == 'insert') {
                $clause_insert .= $key.',';
                $input_insert .= '?,';
                $execute_input[] = $value;
            } elseif ($command == 'update') {
                $clause .= $key.'=?,';
                $execute_input[] = $value;
            }
        }

        //CLEAN UP INPUT
        $clause = substr($clause, 0, -1); //Clean clause - remove last comma
        $clause_insert = substr($clause_insert, 0, -1); //Clean clause - remove last comma
        $input_insert = substr($input_insert, 0, -1); //Clean clause - remove last comma

        //QUERY AND VERIFY ALLOWED
        if ($command == 'update' && isAllowed('software',$profile,$permission,'U') === 1){
            $sql = 'UPDATE software_versions SET '.$clause.' WHERE rowID = ?';
            $execute_input[] = $id;
            $stmt = $pdo->prepare($sql);
            $stmt->execute($execute_input);
        }
        elseif ($command == 'insert' && isAllowed('software',$profile,$permission,'C') === 1){
            $sql = 'INSERT INTO software_versions ('.$clause_insert.') VALUES ('.$input_insert.')';
            $stmt = $pdo->prepare($sql);
            $stmt->execute($execute_input);
        }
        elseif ($command == 'delete' && isAllowed('software',$profile,$permission,'D') === 1){
            $stmt = $pdo->prepare('DELETE FROM software_versions WHERE rowID = ?');
            $stmt->execute([$id]);

            //Add deletion to changelog
            changelog($dbname,'software_versions',$id,'Delete','Delete',$username);
        } else {
            http_response_code(403);
            echo json_encode(['error' => 'Operation not allowed']);
        }
        break;
}

?>