<?php
/**
 * MUA read-only Unraid status helper.
 *
 * It deliberately returns compact, selected fields instead of raw Unraid
 * configuration files, SMART dumps or notification archives.
 */

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

function respond(array $value): void {
    echo json_encode($value, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . "\n";
}

function fail_status(string $message): void {
    respond(['ok' => false, 'error' => $message]);
    exit(1);
}

function ini_sections(string $path): array {
    if (!is_readable($path)) return [];
    $result = parse_ini_file($path, true, INI_SCANNER_RAW);
    return is_array($result) ? $result : [];
}

function ini_flat(string $path): array {
    if (!is_readable($path)) return [];
    $result = parse_ini_file($path, false, INI_SCANNER_RAW);
    return is_array($result) ? $result : [];
}

function number_value($value): int|float {
    if (!is_numeric($value)) return 0;
    return str_contains((string)$value, '.') ? (float)$value : (int)$value;
}

function clean_text(string $text, int $max = 500): string {
    $text = preg_replace('/\x1b\[[0-9;]*[A-Za-z]/', '', $text) ?? '';
    $text = preg_replace('/((?:api[_-]?key|token|secret|password|passwd|authorization|cookie)\s*[=:]\s*)([^\s,;]+)/i', '$1[REDACTED]', $text) ?? '';
    $text = preg_replace('/("(?:api[_-]?key|token|secret|password|passwd|authorization|cookie)"\s*:\s*")[^"]*(")/i', '$1[REDACTED]$2', $text) ?? '';
    $text = trim(preg_replace('/\s+/', ' ', $text) ?? '');
    return mb_substr($text, 0, $max);
}

function bytes_from_meminfo(string $key): int {
    $raw = @file_get_contents('/proc/meminfo') ?: '';
    if (preg_match('/^' . preg_quote($key, '/') . ':\s+(\d+)\s+kB$/mi', $raw, $m)) {
        return (int)$m[1] * 1024;
    }
    return 0;
}

function thermal_readings(): array {
    $out = [];
    foreach (glob('/sys/class/hwmon/hwmon*') ?: [] as $dir) {
        $chip = trim(@file_get_contents($dir . '/name') ?: basename($dir));
        foreach (glob($dir . '/temp*_input') ?: [] as $input) {
            $raw = trim(@file_get_contents($input) ?: '');
            if (!is_numeric($raw)) continue;
            $value = (float)$raw / 1000;
            if ($value < -20 || $value > 150) continue;
            $prefix = preg_replace('/_input$/', '', $input);
            $label = trim(@file_get_contents($prefix . '_label') ?: basename((string)$prefix));
            $out[] = ['sensor' => $chip . ':' . $label, 'celsius' => round($value, 1)];
            if (count($out) >= 24) break 2;
        }
    }
    return $out;
}

function system_health(): array {
    $total = bytes_from_meminfo('MemTotal');
    $available = bytes_from_meminfo('MemAvailable');
    $load = array_map('floatval', array_slice(preg_split('/\s+/', trim(@file_get_contents('/proc/loadavg') ?: '0 0 0')), 0, 3));
    $uptime = (int)floor((float)explode(' ', trim(@file_get_contents('/proc/uptime') ?: '0'))[0]);
    return [
        'schema_version' => '1.0',
        'hostname' => gethostname() ?: '',
        'uptime_seconds' => $uptime,
        'cpu_logical' => (int)trim((string)shell_exec('getconf _NPROCESSORS_ONLN 2>/dev/null')),
        'load_average' => ['one' => $load[0] ?? 0, 'five' => $load[1] ?? 0, 'fifteen' => $load[2] ?? 0],
        'memory' => [
            'total_bytes' => $total,
            'available_bytes' => $available,
            'used_bytes' => max(0, $total - $available),
            'used_percent' => $total > 0 ? round((($total - $available) / $total) * 100, 1) : 0,
        ],
        'temperatures' => thermal_readings(),
    ];
}

function selected_disk(array $disk): array {
    $size = number_value($disk['fsSize'] ?? $disk['size'] ?? 0);
    $used = number_value($disk['fsUsed'] ?? 0);
    $free = number_value($disk['fsFree'] ?? 0);
    return [
        'name' => $disk['name'] ?? '',
        'device' => $disk['device'] ?? '',
        'type' => $disk['type'] ?? '',
        'status' => $disk['status'] ?? '',
        'state' => $disk['state'] ?? '',
        'temperature_c' => number_value($disk['temp'] ?? 0),
        'errors' => number_value($disk['numErrors'] ?? 0),
        'filesystem' => $disk['fsType'] ?? '',
        'filesystem_status' => $disk['fsStatus'] ?? '',
        'size_bytes' => $size,
        'used_bytes' => $used,
        'free_bytes' => $free,
        'used_percent' => $size > 0 ? round(($used / $size) * 100, 1) : 0,
    ];
}

function storage_status(): array {
    $var = ini_flat('/var/local/emhttp/var.ini');
    $disks = array_values(array_map('selected_disk', ini_sections('/var/local/emhttp/disks.ini')));
    $disabled = number_value($var['mdNumDisabled'] ?? 0);
    $missing = number_value($var['mdNumMissing'] ?? 0);
    $invalid = number_value($var['mdNumInvalid'] ?? 0);
    $alerts = [];
    if ($disabled > 0) $alerts[] = "$disabled disk(s) disabled";
    if ($missing > 0) $alerts[] = "$missing disk(s) missing";
    if ($invalid > 0) $alerts[] = "$invalid disk(s) invalid";
    return [
        'schema_version' => '1.0',
        'array_state' => $var['mdState'] ?? '',
        'filesystem_state' => $var['fsState'] ?? '',
        'disabled_disks' => $disabled,
        'missing_disks' => $missing,
        'invalid_disks' => $invalid,
        'parity' => [
            'running' => number_value($var['mdResync'] ?? 0) > 0,
            'action' => $var['mdResyncAction'] ?? '',
            'position' => number_value($var['mdResyncPos'] ?? 0),
            'size' => number_value($var['mdResyncSize'] ?? 0),
            'corrections' => number_value($var['mdResyncCorr'] ?? 0),
        ],
        'alerts' => $alerts,
        'disk_count' => count($disks),
        'disks' => $disks,
    ];
}

function smart_attributes(string $name): array {
    $path = '/var/local/emhttp/smart/' . $name;
    if (!is_readable($path)) return [];
    $wanted = [5, 9, 187, 188, 197, 198, 199, 202, 231, 241, 242];
    $result = [];
    foreach (file($path, FILE_IGNORE_NEW_LINES) ?: [] as $line) {
        if (!preg_match('/^\s*(\d+)\s+([A-Za-z0-9_-]+)\s+.*?\s(-|FAILING_NOW)\s+(.+)$/', $line, $m)) continue;
        $id = (int)$m[1];
        if (!in_array($id, $wanted, true)) continue;
        $result[] = ['id' => $id, 'name' => $m[2], 'when_failed' => $m[3], 'raw' => clean_text($m[4], 80)];
    }
    return $result;
}

function disk_health(?string $requested): array {
    $sections = ini_sections('/var/local/emhttp/disks.ini');
    $result = [];
    foreach ($sections as $section => $disk) {
        $name = trim((string)($disk['name'] ?? trim($section, '"')));
        if ($requested !== null && $requested !== '' && $name !== $requested) continue;
        $entry = selected_disk($disk);
        $entry['smart_attributes'] = smart_attributes($name);
        $entry['healthy'] = number_value($disk['numErrors'] ?? 0) === 0 && !in_array($disk['status'] ?? '', ['DISK_DSBL', 'DISK_NP'], true);
        $result[] = $entry;
    }
    if ($requested && count($result) === 0) fail_status('Unknown disk name');
    return ['schema_version' => '1.0', 'disk_count' => count($result), 'disks' => $result];
}

function notification_list(int $limit, ?string $importance): array {
    $limit = max(1, min(50, $limit));
    $files = array_merge(glob('/tmp/notifications/*.notify') ?: [], glob('/tmp/notifications/archive/*.notify') ?: []);
    usort($files, fn($a, $b) => filemtime($b) <=> filemtime($a));
    $items = [];
    foreach ($files as $file) {
        $n = parse_ini_file($file, false, INI_SCANNER_RAW);
        if (!is_array($n)) continue;
        $level = trim((string)($n['importance'] ?? 'normal'), '"');
        if ($importance && $importance !== 'all' && $level !== $importance) continue;
        $items[] = [
            'timestamp' => number_value(trim((string)($n['timestamp'] ?? filemtime($file)), '"')),
            'event' => clean_text(trim((string)($n['event'] ?? ''), '"'), 100),
            'importance' => $level,
            'subject' => clean_text(trim((string)($n['subject'] ?? ''), '"'), 180),
            'description' => clean_text(trim((string)($n['description'] ?? ''), '"'), 500),
            'archived' => str_contains($file, '/archive/'),
        ];
        if (count($items) >= $limit) break;
    }
    return ['schema_version' => '1.0', 'count' => count($items), 'notifications' => $items];
}

function share_entry(array $share, bool $details): array {
    $size = number_value($share['size'] ?? 0);
    $used = number_value($share['used'] ?? 0);
    $entry = [
        'name' => $share['name'] ?? '',
        'pool' => $share['cachePool'] ?? '',
        'secondary_pool' => $share['cachePool2'] ?? '',
        'size_bytes' => $size,
        'used_bytes' => $used,
        'free_bytes' => number_value($share['free'] ?? 0),
        'used_percent' => $size > 0 ? round(($used / $size) * 100, 1) : 0,
        'exclusive' => ($share['exclusive'] ?? '') === 'yes',
        'status_color' => $share['color'] ?? '',
    ];
    if ($details) {
        $entry += [
            'comment' => clean_text((string)($share['comment'] ?? ''), 300),
            'allocation_method' => $share['allocator'] ?? '',
            'split_level' => $share['splitLevel'] ?? '',
            'minimum_free_space' => number_value($share['floor'] ?? 0),
            'included_disks' => $share['include'] ?? '',
            'excluded_disks' => $share['exclude'] ?? '',
            'cache_mode' => $share['useCache'] ?? '',
            'has_config' => ($share['hasCfg'] ?? '') === 'yes',
        ];
    }
    return $entry;
}

function shares_list(?string $requested): array {
    $sections = ini_sections('/var/local/emhttp/shares.ini');
    $items = [];
    foreach ($sections as $section => $share) {
        $name = (string)($share['name'] ?? trim($section, '"'));
        if ($requested !== null && $requested !== '' && $name !== $requested) continue;
        $items[] = share_entry($share, $requested !== null && $requested !== '');
    }
    if ($requested && count($items) === 0) fail_status('Unknown share name');
    return ['schema_version' => '1.0', 'share_count' => count($items), 'shares' => $items];
}

function docker_update_status(): array {
    $path = '/var/lib/docker/unraid-update-status.json';
    $updates = is_readable($path) ? json_decode((string)file_get_contents($path), true) : [];
    if (!is_array($updates)) $updates = [];
    $rows = [];
    exec('/usr/bin/docker ps -a --format ' . escapeshellarg('{{.Names}}|{{.Image}}'), $rows);
    $items = [];
    foreach ($rows as $row) {
        [$name, $image] = array_pad(explode('|', $row, 2), 2, '');
        $key = $image;
        if (!isset($updates[$key]) && !str_contains($key, '/')) $key = 'library/' . $key;
        $state = $updates[$key]['status'] ?? null;
        $items[] = [
            'container' => $name,
            'image' => $image,
            'status' => $state === 'true' ? 'up-to-date' : ($state === 'false' ? 'update-available' : 'unknown'),
        ];
    }
    $available = count(array_filter($items, fn($x) => $x['status'] === 'update-available'));
    return ['schema_version' => '1.0', 'container_count' => count($items), 'updates_available' => $available, 'containers' => $items];
}

$action = $argv[1] ?? '';
switch ($action) {
    case 'system-health': respond(system_health()); break;
    case 'storage-status': respond(storage_status()); break;
    case 'disk-health': respond(disk_health($argv[2] ?? null)); break;
    case 'notifications': respond(notification_list((int)($argv[2] ?? 20), $argv[3] ?? 'all')); break;
    case 'shares-list': respond(shares_list(null)); break;
    case 'share-inspect': respond(shares_list($argv[2] ?? '')); break;
    case 'docker-update-status': respond(docker_update_status()); break;
    default: fail_status('Unknown read-only status action');
}