<?php
declare(strict_types=1);

require_once __DIR__ . '/lib/bootstrap.php';

header('Content-Type: application/json; charset=utf-8');

function api_json(array $payload, int $status = 200): never
{
    http_response_code($status);
    echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

function api_input(): array
{
    $raw = file_get_contents('php://input');
    if ($raw === false || trim($raw) === '') {
        return $_POST ?: [];
    }

    $decoded = json_decode($raw, true);
    if (is_array($decoded)) {
        return $decoded;
    }

    return $_POST ?: [];
}

function api_mirror_config_change(array $config, string $action, array $payload): array
{
    $response = app_sync_remote_action($config, $action, $payload);
    if (is_array($response) && is_array($response['config'] ?? null)) {
        $config = app_merge_synced_config($config, $response['config']);
        app_save_config($config);
    }

    return $config;
}

try {
    $config = app_load_config();
    $client = new HomeAssistantClient($config);
    $action = strtolower((string)($_GET['action'] ?? 'snapshot'));

    if ($action === 'bootstrap') {
        api_json(app_build_snapshot($config, $client, 'main'));
    }

    if ($action === 'snapshot') {
        $spaceId = (string)($_GET['space_id'] ?? ($_GET['room_id'] ?? 'main'));
        api_json(app_build_snapshot($config, $client, $spaceId));
    }

    if ($action === 'history') {
        $entityId = trim((string)($_GET['entity_id'] ?? ''));
        $hours = max(1, (int)($_GET['hours'] ?? 24));

        if ($entityId === '') {
            api_json(['ok' => false, 'error' => 'entity_id is required'], 400);
        }

        api_json([
            'ok' => true,
            'entity_id' => $entityId,
            'hours' => $hours,
            'history' => $client->fetchEntityHistory($entityId, $hours),
        ]);
    }

    if ($action === 'service') {
        $payload = api_input();
        $entityId = trim((string)($payload['entity_id'] ?? ''));
        $command = trim((string)($payload['command'] ?? 'toggle'));
        $value = $payload['value'] ?? null;

        if ($entityId === '') {
            api_json(['ok' => false, 'error' => 'entity_id is required'], 400);
        }

        [$domain, $service, $serviceData] = app_service_for_entity($entityId, $command);
        if ($command === 'set_temperature' && $value !== null) {
            $serviceData['temperature'] = $value;
        }
        if ($command === 'set_hvac_mode' && $value !== null) {
            $serviceData['hvac_mode'] = $value;
        }
        if ($command === 'set_fan_mode' && $value !== null) {
            $serviceData['fan_mode'] = $value;
        }
        if ($command === 'set_swing_mode' && $value !== null) {
            $serviceData['swing_mode'] = $value;
        }
        if ($command === 'set_preset_mode' && $value !== null) {
            $serviceData['preset_mode'] = $value;
        }
        if ($command === 'set_position' && $value !== null) {
            $serviceData['position'] = $value;
        }

        $result = $client->callService($domain, $service, $serviceData);
        api_json(['ok' => true, 'result' => $result]);
    }

    if ($action === 'save-entity-override') {
        $payload = api_input();
        $roomId = trim((string)($payload['room_id'] ?? ''));
        $entityId = trim((string)($payload['entity_id'] ?? ''));

        if ($roomId === '' || $entityId === '') {
            api_json(['ok' => false, 'error' => 'room_id and entity_id are required'], 400);
        }

        $patch = [
            'visible' => array_key_exists('visible', $payload) ? (bool)$payload['visible'] : null,
            'order' => array_key_exists('order', $payload) ? (int)$payload['order'] : null,
            'card_type' => array_key_exists('card_type', $payload) ? (string)$payload['card_type'] : null,
            'title' => array_key_exists('title', $payload) ? (string)$payload['title'] : null,
            'icon' => array_key_exists('icon', $payload) ? (string)$payload['icon'] : null,
        ];

        $config = app_update_entity_override($config, $roomId, $entityId, $patch);
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);
        api_json(['ok' => true, 'config' => ['rooms' => $config['rooms']]]);
    }

    if ($action === 'save-space-override') {
        $payload = api_input();
        $roomId = trim((string)($payload['room_id'] ?? ''));

        if ($roomId === '') {
            api_json(['ok' => false, 'error' => 'room_id is required'], 400);
        }

        $patch = [
            'visible' => array_key_exists('visible', $payload) ? (bool)$payload['visible'] : null,
            'order' => array_key_exists('order', $payload) ? (int)$payload['order'] : null,
            'name' => array_key_exists('name', $payload) ? (string)$payload['name'] : null,
            'icon' => array_key_exists('icon', $payload) ? (string)$payload['icon'] : null,
        ];

        if (array_key_exists('temperature_sensor_entity_id', $payload)) {
            $patch['temperature_sensor_entity_id'] = (string)$payload['temperature_sensor_entity_id'];
        }

        $config = app_update_room_override($config, $roomId, $patch);
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);
        api_json(['ok' => true, 'config' => ['rooms' => $config['rooms']]]);
    }

    if ($action === 'create-room-layout-item') {
        $payload = api_input();
        $roomId = trim((string)($payload['room_id'] ?? ''));

        if ($roomId === '') {
            api_json(['ok' => false, 'error' => 'room_id is required'], 400);
        }

        $layoutItemId = trim((string)($payload['layout_item_id'] ?? ''));
        if ($layoutItemId === '') {
            $layoutItemId = 'slot_' . str_replace('.', '', uniqid('', true));
        }

        $order = array_key_exists('order', $payload) ? (int)$payload['order'] : null;
        $config = app_update_room_layout_item($config, $roomId, $layoutItemId, [
            'order' => $order,
        ]);
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);

        api_json([
            'ok' => true,
            'layout_item_id' => $layoutItemId,
            'config' => ['rooms' => $config['rooms']],
        ]);
    }

    if ($action === 'save-room-layout-item') {
        $payload = api_input();
        $roomId = trim((string)($payload['room_id'] ?? ''));
        $layoutItemId = trim((string)($payload['layout_item_id'] ?? ''));

        if ($roomId === '' || $layoutItemId === '') {
            api_json(['ok' => false, 'error' => 'room_id and layout_item_id are required'], 400);
        }

        $patch = [
            'order' => array_key_exists('order', $payload) ? (int)$payload['order'] : null,
        ];

        $config = app_update_room_layout_item($config, $roomId, $layoutItemId, $patch);
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);
        api_json(['ok' => true, 'config' => ['rooms' => $config['rooms']]]);
    }

    if ($action === 'delete-room-layout-item') {
        $payload = api_input();
        $roomId = trim((string)($payload['room_id'] ?? ''));
        $layoutItemId = trim((string)($payload['layout_item_id'] ?? ''));

        if ($roomId === '' || $layoutItemId === '') {
            api_json(['ok' => false, 'error' => 'room_id and layout_item_id are required'], 400);
        }

        $config = app_delete_room_layout_item($config, $roomId, $layoutItemId);
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);
        api_json(['ok' => true, 'config' => ['rooms' => $config['rooms']]]);
    }

    if ($action === 'reorder-room-grid') {
        $payload = api_input();
        $roomId = trim((string)($payload['room_id'] ?? ''));
        $entries = $payload['entries'] ?? [];

        if ($roomId === '' || !is_array($entries)) {
            api_json(['ok' => false, 'error' => 'room_id and entries are required'], 400);
        }

        $config = app_reorder_room_grid($config, $roomId, $entries);
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);
        api_json(['ok' => true, 'config' => ['rooms' => $config['rooms']]]);
    }

    if ($action === 'save-settings') {
        $payload = api_input();
        if (array_key_exists('edit_mode', $payload)) {
            $config['app']['edit_mode'] = (bool)$payload['edit_mode'];
        }
        if (array_key_exists('title', $payload) && trim((string)$payload['title']) !== '') {
            $config['app']['title'] = trim((string)$payload['title']);
        }
        $config = api_mirror_config_change($config, $action, $payload);
        app_save_config($config);
        api_json(['ok' => true, 'settings' => $config['app']]);
    }

    if ($action === 'popup') {
        $payload = api_input();
        $popup = app_handle_popup_event($config, $payload);
        api_json(['ok' => true, 'popup' => $popup]);
    }

    api_json(['ok' => false, 'error' => 'Unknown action'], 404);
} catch (Throwable $e) {
    api_json([
        'ok' => false,
        'error' => $e->getMessage(),
    ], 500);
}