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

error_reporting(E_ALL);
ini_set('display_errors', 0);

// Load environment variables with error check
$envFile = __DIR__ . '/.env';
if (!file_exists($envFile)) {
    echo json_encode([
        'success' => false,
        'error' => 'Configuration file not found'
    ]);
    exit;
}

$envVars = parse_ini_file($envFile, false, INI_SCANNER_TYPED);
if (!$envVars) {
    echo json_encode([
        'success' => false,
        'error' => 'Invalid configuration file'
    ]);
    exit;
}

// Strip quotes from values if present (parse_ini_file may include them)
foreach ($envVars as $key => $value) {
    if (is_string($value)) {
        if ((substr($value, 0, 1) === '"' && substr($value, -1) === '"') ||
            (substr($value, 0, 1) === "'" && substr($value, -1) === "'")) {
            $envVars[$key] = substr($value, 1, -1);
        }
    }
}

// Database connection with detailed error handling
$conn = new mysqli(
    $envVars['DB_HOST'],
    $envVars['DB_USER'],
    $envVars['DB_PASS'],
    $envVars['DB_NAME']
);

if ($conn->connect_error) {
    echo json_encode([
        'success' => false,
        'error' => 'Database connection failed: ' . $conn->connect_error
    ]);
    exit;
}

// Load application config so UrlHelper can resolve APP_DOMAIN
require_once __DIR__ . '/config/config.php';

// Authenticate via API key
require_once __DIR__ . '/middleware/ApiKeyAuth.php';
require_once __DIR__ . '/models/AuditLogModel.php';
require_once __DIR__ . '/helpers/UrlHelper.php';

$apiKeyAuth = new ApiKeyAuth($conn);

try {
    $systemUser = $apiKeyAuth->authenticate();
} catch (Exception $e) {
    // Authentication failed - ApiKeyAuth already sent the response
    exit;
}

$userId = $systemUser['user_id'];

// Create tickets table with hash column if not exists
$createTableSQL = "CREATE TABLE IF NOT EXISTS tickets (
    id INT AUTO_INCREMENT PRIMARY KEY,
    ticket_id VARCHAR(9) NOT NULL,
    title VARCHAR(255) NOT NULL,
    hash VARCHAR(64) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY unique_hash (hash)
)";

$conn->query($createTableSQL);

// Parse input regardless of content-type header
$rawInput = file_get_contents('php://input');
$data = json_decode($rawInput, true);

// Validate required fields before any processing
if (!is_array($data) || empty($data['title'])) {
    // Try URL-encoded fallback
    if (empty($data['title'])) {
        parse_str($rawInput, $urlData);
        if (!empty($urlData['title'])) {
            $data = $urlData;
        }
    }
    if (!is_array($data) || empty($data['title'])) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'title is required']);
        exit;
    }
}

// Generate hash from stable components
function generateTicketHash($data) {
    $title = (string)($data['title'] ?? '');

    // Extract device name if present (matches /dev/sdX, /dev/nvmeXnY patterns)
    preg_match('/\/dev\/(sd[a-z]+|nvme\d+n\d+)/', $title, $deviceMatches);
    $isDriveTicket = !empty($deviceMatches);

    // Extract first bracketed tag as hostname/source
    preg_match('/^\[([^\]]+)\]/', $title, $hostMatches);
    $hostname = $hostMatches[1] ?? '';

    // Detect issue category and optional sub-type
    $issueCategory = '';
    $issueSubtype  = '';
    $isClusterWide = false;

    if (stripos($title, 'SMART issues') !== false) {
        $issueCategory = 'smart';
    } elseif (stripos($title, 'LXC') !== false || stripos($title, 'storage usage') !== false) {
        $issueCategory = 'storage';
        // Include the LXC container ID so each container gets its own ticket
        if (preg_match('/LXC\s+(\d+)/i', $title, $lxcMatch)) {
            $issueSubtype = 'lxc_' . $lxcMatch[1];
        }
    } elseif (stripos($title, 'memory') !== false) {
        $issueCategory = 'memory';
    } elseif (stripos($title, 'cpu') !== false) {
        $issueCategory = 'cpu';
    } elseif (stripos($title, 'network') !== false) {
        $issueCategory = 'network';
    } elseif (stripos($title, 'Ceph') !== false || stripos($title, '[ceph]') !== false) {
        $issueCategory = 'ceph';
        if (stripos($title, '[cluster-wide]') !== false ||
            stripos($title, 'HEALTH_ERR') !== false ||
            stripos($title, 'HEALTH_WARN') !== false ||
            stripos($title, 'cluster usage') !== false) {
            $isClusterWide = true;
        }
        // Normalize the specific Ceph warning type so different warnings get distinct tickets
        if (stripos($title, 'slow') !== false && stripos($title, 'BlueStore') !== false) {
            $issueSubtype = 'bluestore_slow';
        } elseif (stripos($title, 'clock skew') !== false) {
            $issueSubtype = 'clock_skew';
        } elseif (stripos($title, 'cluster usage') !== false) {
            $issueSubtype = 'usage';
        } elseif (stripos($title, 'OSD down') !== false) {
            $issueSubtype = 'osd_down';
        } elseif (stripos($title, 'HEALTH_ERR') !== false) {
            $issueSubtype = 'health_err';
        }
    }

    // Build stable components
    $stableComponents = [
        'issue_category' => $issueCategory,
        'issue_subtype'  => $issueSubtype,
        'environment_tags' => array_values(array_filter(
            explode('][', $title),
            fn($tag) => in_array($tag, ['production', 'development', 'staging', 'single-node', 'cluster-wide'])
        )),
    ];

    // Include hostname for node-specific issues
    if (!$isClusterWide) {
        $stableComponents['hostname'] = $hostname;
    }

    // Include device path for drive-specific tickets
    if ($isDriveTicket) {
        $stableComponents['device'] = $deviceMatches[0];
    }

    sort($stableComponents['environment_tags']);

    return hash('sha256', json_encode($stableComponents, JSON_UNESCAPED_SLASHES));
}

// Shared ticket data
$title       = (string)($data['title']       ?? '');
$description = (string)($data['description'] ?? '');
$status      = (string)($data['status']      ?? 'Open');
$priority    = $data['priority'] ?? '4';
$category    = (string)($data['category']    ?? 'General');
$type        = (string)($data['type']        ?? 'Issue');

$ticketHash = generateTicketHash($data);
$auditLog   = new AuditLogModel($conn);

// Look up any existing ticket with this hash (open OR closed)
$checkStmt = $conn->prepare("SELECT ticket_id, status FROM tickets WHERE hash = ? ORDER BY created_at DESC LIMIT 1");
$checkStmt->bind_param("s", $ticketHash);
$checkStmt->execute();
$existing = $checkStmt->get_result()->fetch_assoc();
$checkStmt->close();

if ($existing) {
    $existingId     = $existing['ticket_id'];
    $existingStatus = $existing['status'];

    if ($existingStatus !== 'Closed') {
        // Ticket is still active — do not create a duplicate
        echo json_encode([
            'success'            => false,
            'error'              => 'Duplicate ticket',
            'existing_ticket_id' => $existingId,
        ]);
        exit;
    }

    // Ticket was closed — reopen it and add a recurrence comment
    $reopenStmt = $conn->prepare(
        "UPDATE tickets SET status = 'Open', closed_at = NULL, updated_at = NOW(), updated_by = ? WHERE ticket_id = ?"
    );
    $reopenStmt->bind_param("is", $userId, $existingId);
    $reopenStmt->execute();
    $reopenStmt->close();

    $commentText = "**Issue recurred — ticket reopened automatically.**\n\n" .
                   "New report received from hwmonDaemon:\n\n" . $description;
    $commentStmt = $conn->prepare(
        "INSERT INTO ticket_comments (ticket_id, user_id, user_name, comment_text, markdown_enabled) VALUES (?, ?, 'hwmonDaemon', ?, 1)"
    );
    $commentStmt->bind_param("sis", $existingId, $userId, $commentText);
    $commentStmt->execute();
    $commentStmt->close();

    $auditLog->log($userId, 'update', 'ticket', $existingId, [
        'status' => ['from' => 'Closed', 'to' => 'Open'],
        'reason' => 'auto-reopened by hwmonDaemon (issue recurred)',
    ]);

    $conn->close();

    require_once __DIR__ . '/helpers/NotificationHelper.php';
    NotificationHelper::sendTicketNotification($existingId, [
        'title'    => $title,
        'priority' => $priority,
        'category' => $category,
        'type'     => $type,
        'status'   => 'Open',
    ], 'automated');

    echo json_encode([
        'success'   => true,
        'ticket_id' => $existingId,
        'message'   => 'Existing closed ticket reopened',
        'action'    => 'reopened',
    ]);
    exit;
}

// No existing ticket — create a new one
$ticket_id = sprintf('%09d', mt_rand(1, 999999999));
$insertStmt = $conn->prepare(
    "INSERT INTO tickets (ticket_id, title, description, status, priority, category, type, hash, created_by)
     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
);
$insertStmt->bind_param("ssssssssi",
    $ticket_id, $title, $description, $status, $priority, $category, $type, $ticketHash, $userId
);

try {
    $inserted = $insertStmt->execute();
} catch (mysqli_sql_exception $e) {
    $insertStmt->close();
    if ($e->getCode() === 1062) {
        // Race condition: another node inserted the same hash between our SELECT and INSERT
        echo json_encode(['success' => false, 'error' => 'Duplicate ticket']);
    } else {
        echo json_encode(['success' => false, 'error' => $e->getMessage()]);
    }
    exit;
}
$insertStmt->close();

if ($inserted) {
    $auditLog->logTicketCreate($userId, $ticket_id, [
        'title'    => $title,
        'priority' => $priority,
        'category' => $category,
        'type'     => $type,
    ]);

    $conn->close();

    require_once __DIR__ . '/helpers/NotificationHelper.php';
    NotificationHelper::sendTicketNotification($ticket_id, [
        'title'    => $title,
        'priority' => $priority,
        'category' => $category,
        'type'     => $type,
        'status'   => $status,
    ], 'automated');

    echo json_encode([
        'success'    => true,
        'ticket_id'  => $ticket_id,
        'message'    => 'Ticket created successfully',
    ]);
} else {
    echo json_encode(['success' => false, 'error' => $conn->error]);
}