<?php
declare(strict_types=1);

function app_default_config(): array
{
    return [
        'app' => [
            'title' => 'Wall Panel',
            'poll_interval_ms' => 5000,
            'main_room_name' => 'Главная',
            'main_room_icon' => 'mdi:home',
            'edit_mode' => false,
            'battery_history_hours' => 4320,
        ],
        'home_assistant' => [
            'base_url' => '',
            'token' => '',
            'verify_ssl' => true,
            'sync_url' => '',
            'sync_token' => '',
            'sync_timeout' => 10,
            'sync_verify_ssl' => true,
            'sync_cache_seconds' => 30,
            'weather_entity_id' => '',
            'auto_label' => 'auto',
            'auto_entity_ids' => [],
        ],
        'camera' => [
            'rtsp_url' => 'rtsp://10.0.6.110:45321/feff99fa45f317e7',
            'stream_url' => '',
            'stream_mode' => 'hls',
            'poster_url' => 'http://10.0.6.110:5000/api/doorbell/latest.jpg',
            'popup_timeout_minutes' => 3,
            'trigger_entities' => [
                'binary_sensor.door_all_occupancy',
                'binary_sensor.barn_all_occupancy',
                'binary_sensor.doorbell_all_occupancy',
            ],
        ],
        'rooms' => [],
    ];
}

function app_config_path(): string
{
    $override = trim((string)getenv('WALL_PANEL_CONFIG_PATH'));
    if ($override !== '') {
        return $override;
    }

    return APP_ROOT . '/config/config.json';
}

function app_storage_path(string $file): string
{
    $override = trim((string)getenv('WALL_PANEL_STORAGE_DIR'));
    $base = $override !== '' ? rtrim($override, '/') : APP_ROOT . '/storage';
    return $base . '/' . ltrim($file, '/');
}

function app_ensure_directory(string $path): void
{
    if (!is_dir($path)) {
        mkdir($path, 0775, true);
    }
}

function app_load_config(): array
{
    $path = app_config_path();
    app_ensure_directory(dirname($path));

    $config = app_default_config();
    $storedConfig = $config;
    if (!file_exists($path)) {
        $json = json_encode($config, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        if ($json === false) {
            throw new RuntimeException('Failed to encode default config');
        }

        file_put_contents($path, $json . PHP_EOL, LOCK_EX);
    } else {
        $raw = file_get_contents($path);
        if ($raw === false || trim($raw) !== '') {
            $decoded = json_decode((string)$raw, true);
            if (!is_array($decoded)) {
                throw new RuntimeException('Invalid JSON in config/config.json');
            }

            $config = array_replace_recursive($config, $decoded);
            $storedConfig = $config;
        }
    }

    $optionsPath = function_exists('app_addon_options_path')
        ? app_addon_options_path()
        : '/data/options.json';
    if (is_file($optionsPath)) {
        $options = app_load_json_file($optionsPath, []);
        if (is_array($options) && $options !== []) {
            $config = array_replace_recursive($config, $options);
            if (app_runtime_mode() === 'addon' && $config !== $storedConfig) {
                app_save_config($config);
            }
        }
    }

    return $config;
}

function app_save_config(array $config): void
{
    $path = app_config_path();
    app_ensure_directory(dirname($path));

    $json = json_encode($config, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    if ($json === false) {
        throw new RuntimeException('Failed to encode config');
    }

    file_put_contents($path, $json . PHP_EOL, LOCK_EX);
}

function app_load_json_file(string $path, array $fallback = []): array
{
    if (!file_exists($path)) {
        return $fallback;
    }

    $raw = file_get_contents($path);
    if ($raw === false || trim($raw) === '') {
        return $fallback;
    }

    $decoded = json_decode($raw, true);
    return is_array($decoded) ? $decoded : $fallback;
}

function app_save_json_file(string $path, array $data): void
{
    app_ensure_directory(dirname($path));
    $json = json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    if ($json === false) {
        throw new RuntimeException('Failed to encode JSON');
    }

    file_put_contents($path, $json . PHP_EOL, LOCK_EX);
}

function app_remote_sync_enabled(array $config): bool
{
    $syncUrl = trim((string)($config['home_assistant']['sync_url'] ?? ''));
    $syncToken = trim((string)($config['home_assistant']['sync_token'] ?? ''));

    return $syncUrl !== '' && $syncToken !== '';
}

function app_remote_sync_cache_path(): string
{
    return app_storage_path('ha_sync_cache.json');
}

function app_remote_sync_cache_ttl(array $config): int
{
    return max(5, (int)($config['home_assistant']['sync_cache_seconds'] ?? 30));
}

function app_http_json_request(
    string $method,
    string $url,
    array $headers = [],
    ?array $body = null,
    int $timeout = 10,
    bool $verifySsl = true,
    bool $throwOnFailure = false
): array|null {
    $ch = curl_init($url);
    if ($ch === false) {
        if ($throwOnFailure) {
            throw new RuntimeException('Failed to initialize HTTP client');
        }
        return null;
    }

    $requestHeaders = array_merge([
        'Accept: application/json',
    ], $headers);
    if ($body !== null) {
        $requestHeaders[] = 'Content-Type: application/json';
    }

    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_CUSTOMREQUEST => strtoupper($method),
        CURLOPT_HTTPHEADER => $requestHeaders,
        CURLOPT_TIMEOUT => max(1, $timeout),
        CURLOPT_CONNECTTIMEOUT => max(1, min(7, $timeout)),
        CURLOPT_SSL_VERIFYPEER => $verifySsl,
        CURLOPT_SSL_VERIFYHOST => $verifySsl ? 2 : 0,
    ]);

    if ($body !== null) {
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($body, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
    }

    $raw = curl_exec($ch);
    $errno = curl_errno($ch);
    $error = curl_error($ch);
    $status = (int)curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
    curl_close($ch);

    if ($errno !== 0) {
        if ($throwOnFailure) {
            throw new RuntimeException('HTTP request failed: ' . $error);
        }
        return null;
    }

    if ($status >= 400) {
        if ($throwOnFailure) {
            throw new RuntimeException('HTTP request returned status ' . $status);
        }
        return null;
    }

    $decoded = json_decode((string)$raw, true);
    return is_array($decoded) ? $decoded : [];
}

function app_merge_synced_config(array $baseConfig, array $syncedConfig): array
{
    $syncFields = [
        'sync_url' => (string)($baseConfig['home_assistant']['sync_url'] ?? ''),
        'sync_token' => (string)($baseConfig['home_assistant']['sync_token'] ?? ''),
        'sync_timeout' => (int)($baseConfig['home_assistant']['sync_timeout'] ?? 10),
        'sync_verify_ssl' => (bool)($baseConfig['home_assistant']['sync_verify_ssl'] ?? true),
        'sync_cache_seconds' => (int)($baseConfig['home_assistant']['sync_cache_seconds'] ?? 30),
    ];

    $merged = array_replace_recursive($baseConfig, $syncedConfig);
    foreach ($syncFields as $key => $value) {
        $merged['home_assistant'][$key] = $value;
    }

    return $merged;
}

function app_load_remote_config(array $config, bool $refresh = false): array|null
{
    if (!app_remote_sync_enabled($config)) {
        return null;
    }

    $cachePath = app_remote_sync_cache_path();
    $cache = app_load_json_file($cachePath, []);
    $cachedConfig = is_array($cache['config'] ?? null) ? $cache['config'] : null;
    $cachedAt = (int)($cache['fetched_at'] ?? 0);
    $ttl = app_remote_sync_cache_ttl($config);

    if (!$refresh && $cachedConfig !== null && $cachedAt > 0 && (time() - $cachedAt) < $ttl) {
        return $cachedConfig;
    }

    $syncUrl = trim((string)($config['home_assistant']['sync_url'] ?? ''));
    $syncToken = trim((string)($config['home_assistant']['sync_token'] ?? ''));
    $timeout = max(1, (int)($config['home_assistant']['sync_timeout'] ?? 10));
    $verifySsl = (bool)($config['home_assistant']['sync_verify_ssl'] ?? true);

    $response = app_http_json_request('GET', $syncUrl, [
        'X-Wall-Panel-Token: ' . $syncToken,
    ], null, $timeout, $verifySsl, false);

    $remoteConfig = null;
    if (is_array($response)) {
        if (is_array($response['config'] ?? null)) {
            $remoteConfig = $response['config'];
        } elseif (!isset($response['ok']) || (bool)$response['ok'] !== false) {
            $remoteConfig = $response;
        }
    }

    if (is_array($remoteConfig)) {
        app_save_json_file($cachePath, [
            'fetched_at' => time(),
            'config' => $remoteConfig,
        ]);
        return $remoteConfig;
    }

    if ($cachedConfig !== null) {
        return $cachedConfig;
    }

    return null;
}

function app_clear_remote_config_cache(): void
{
    $path = app_remote_sync_cache_path();
    if (file_exists($path)) {
        @unlink($path);
    }
}

function app_sync_remote_action(array $config, string $action, array $payload): array|null
{
    if (!app_remote_sync_enabled($config)) {
        return null;
    }

    $syncUrl = trim((string)($config['home_assistant']['sync_url'] ?? ''));
    $syncToken = trim((string)($config['home_assistant']['sync_token'] ?? ''));
    $timeout = max(1, (int)($config['home_assistant']['sync_timeout'] ?? 10));
    $verifySsl = (bool)($config['home_assistant']['sync_verify_ssl'] ?? true);

    $response = app_http_json_request('POST', $syncUrl, [
        'X-Wall-Panel-Token: ' . $syncToken,
    ], [
        'action' => $action,
        'payload' => $payload,
    ], $timeout, $verifySsl, false);

    if (!is_array($response)) {
        return null;
    }

    if (is_array($response['config'] ?? null)) {
        app_save_json_file(app_remote_sync_cache_path(), [
            'fetched_at' => time(),
            'config' => $response['config'],
        ]);
    }

    return $response;
}