<?php
header('Content-Type: application/json');
require_once dirname(__DIR__) . '/include/config.php';

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

// ── Boot device detection ─────────────────────────────────────────────────────
function vv_storage_detect_transport(): string {
    $part = trim(shell_exec("findmnt -n -o SOURCE /boot 2>/dev/null") ?: '');
    if (!$part) return 'unknown';
    $disk = trim(shell_exec("lsblk -no pkname " . escapeshellarg($part) . " 2>/dev/null") ?: '');
    if (!$disk) return 'unknown';
    return strtolower(trim(shell_exec("lsblk -dno TRAN /dev/" . escapeshellarg($disk) . " 2>/dev/null") ?: 'unknown'));
}

// ── Current mode status ───────────────────────────────────────────────────────
if ($action === 'status') {
    $transport   = vv_storage_detect_transport();
    $detected    = ($transport === 'usb') ? 'flash' : 'internal';
    $currentDir  = SCRIPTS_DIR;
    $internalDir = '/boot/config/plugins/varaverk';
    $flashDir    = '/mnt/user/appdata/Varaverk';
    $currentMode = ($currentDir === $internalDir) ? 'internal'
                 : ($currentDir === $flashDir     ? 'flash' : 'custom');

    $myHost  = vv_detect_host();
    $vars    = vv_conf_vars();
    $confKey = strtoupper($myHost) . '_STORAGE_MODE_INTERNAL';
    $confVal = $vars[$confKey] ?? null;

    // Boot device name for display
    $bootPart = trim(shell_exec("findmnt -n -o SOURCE /boot 2>/dev/null") ?: '');
    $bootDisk = $bootPart ? trim(shell_exec("lsblk -no pkname " . escapeshellarg($bootPart) . " 2>/dev/null") ?: '') : '';

    echo json_encode([
        'ok'           => true,
        'current_mode' => $currentMode,
        'current_dir'  => $currentDir,
        'internal_dir' => $internalDir,
        'flash_dir'    => $flashDir,
        'transport'    => $transport,
        'detected'     => $detected,
        'boot_disk'    => $bootDisk ? '/dev/' . $bootDisk : 'unknown',
        'conf_key'     => $confKey,
        'conf_val'     => $confVal,
        'array_started'=> is_dir('/mnt/user') && count(scandir('/mnt/user')) > 2,
    ]);
    exit;
}

// ── Run migration ─────────────────────────────────────────────────────────────
if ($action === 'migrate' && $_SERVER['REQUEST_METHOD'] === 'POST') {
    $to = trim($_POST['to'] ?? '');
    if (!in_array($to, ['internal', 'flash'], true)) {
        echo json_encode(['ok' => false, 'error' => 'Invalid target: must be internal or flash']);
        exit;
    }

    $script = SCRIPTS_DIR . '/Tools/storage_migrate.sh';
    if (!file_exists($script)) {
        echo json_encode(['ok' => false, 'error' => 'storage_migrate.sh not found']);
        exit;
    }

    set_time_limit(300);
    $output = [];
    $exit   = 0;
    exec('bash ' . escapeshellarg($script) . ' --to=' . escapeshellarg($to) . ' 2>&1', $output, $exit);

    echo json_encode([
        'ok'     => $exit === 0,
        'exit'   => $exit,
        'output' => implode("\n", $output),
    ]);
    exit;
}

// ── Auto-detect and write to conf ─────────────────────────────────────────────
if ($action === 'detect' && $_SERVER['REQUEST_METHOD'] === 'POST') {
    $transport = vv_storage_detect_transport();
    $detected  = ($transport === 'usb') ? 'false' : 'true';
    $myHost    = vv_detect_host();
    $confKey   = strtoupper($myHost) . '_STORAGE_MODE_INTERNAL';
    $confFile  = $myHost . '.conf';

    $results = vv_conf_write_changes([[
        'file'  => $confFile,
        'key'   => $confKey,
        'value' => $detected,
        'type'  => 'scalar',
    ]]);

    $ok = !in_array(false, $results, true);
    echo json_encode(['ok' => $ok, 'detected' => $detected, 'transport' => $transport]);
    exit;
}

echo json_encode(['ok' => false, 'error' => 'Unknown action']);