<?php
declare(strict_types=1);

/**
 * ระดับเสียง Master / Music / SFX — อ่าน/เขียน Game/data/sound-settings.json
 * ใช้ session Admin หลัก (ไม่ต้องล็อกอิน game_ai_admin แยก)
 *
 * GET  -> { masterVol, musicVol, sfxVol } ค่า 0..1
 * PUT  -> body JSON เดียวกัน → บันทึก
 */
require __DIR__ . '/_common.php';

require_login();
require_tab('sound');

define('SOUND_SETTINGS_FILE', dirname(__DIR__, 2) . '/Game/data/sound-settings.json');

function sound_defaults(): array
{
    return ['masterVol' => 1.0, 'musicVol' => 0.35, 'sfxVol' => 0.75];
}

function sound_clamp($v, float $default): float
{
    $n = is_numeric($v) ? (float) $v : $default;
    if (!is_finite($n)) {
        return $default;
    }
    return max(0.0, min(1.0, $n));
}

function sound_read(): array
{
    $base = sound_defaults();
    if (!is_file(SOUND_SETTINGS_FILE)) {
        return $base;
    }
    $raw = @file_get_contents(SOUND_SETTINGS_FILE);
    $j = json_decode($raw ?: '{}', true);
    if (!is_array($j)) {
        return $base;
    }
    return [
        'masterVol' => sound_clamp($j['masterVol'] ?? null, $base['masterVol']),
        'musicVol' => sound_clamp($j['musicVol'] ?? null, $base['musicVol']),
        'sfxVol' => sound_clamp($j['sfxVol'] ?? null, $base['sfxVol']),
    ];
}

function sound_write(array $s): bool
{
    $dir = dirname(SOUND_SETTINGS_FILE);
    if (!is_dir($dir) && !@mkdir($dir, 0755, true)) {
        return false;
    }
    $json = json_encode($s, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    if ($json === false) {
        return false;
    }
    $tmp = SOUND_SETTINGS_FILE . '.tmp.' . bin2hex(random_bytes(4));
    if (file_put_contents($tmp, $json, LOCK_EX) === false) {
        return false;
    }
    if (!rename($tmp, SOUND_SETTINGS_FILE)) {
        @unlink($tmp);
        return false;
    }
    return true;
}

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';

if ($method === 'GET') {
    json_response(sound_read());
}

if ($method === 'PUT' || $method === 'POST') {
    $body = require_json_body();
    $cur = sound_read();
    $next = [
        'masterVol' => array_key_exists('masterVol', $body) ? sound_clamp($body['masterVol'], $cur['masterVol']) : $cur['masterVol'],
        'musicVol' => array_key_exists('musicVol', $body) ? sound_clamp($body['musicVol'], $cur['musicVol']) : $cur['musicVol'],
        'sfxVol' => array_key_exists('sfxVol', $body) ? sound_clamp($body['sfxVol'], $cur['sfxVol']) : $cur['sfxVol'],
    ];
    if (!sound_write($next)) {
        json_response(['ok' => false, 'error' => 'บันทึก sound-settings.json ไม่สำเร็จ'], 500);
    }
    json_response(['ok' => true, 'settings' => $next]);
}

json_response(['ok' => false, 'error' => 'Method not allowed'], 405);