<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Cache;
use App\Services\CaldavService;
use App\Models\Todo;
use App\Models\PipelineItem;

class CaldavSyncCommand extends Command
{
    protected $signature = 'caldav:sync';
    protected $description = 'Sync CalDAV VTODOs into local todos table';

    public function handle(CaldavService $service)
    {
        // only run every 5 minutes although the task is called every minute
        $cacheKey = 'caldav_sync_last_run';
        if (\Illuminate\Support\Facades\Cache::has($cacheKey)) {
            Log::info('CalDAV sync Throttled');
            return 0;
        }
        Cache::put($cacheKey, true, 300);

        Log::info('Synchronizing Todo itmes with CalDAV server');
        $this->info('Synchronizing Todo itmes with CalDAV server');

        $todos = $service->getTodos();

        $count = 0;
        foreach ($todos as $todo) {
            // Only update the fields that are present in CalDAV
            $data = $todo->attributesToArray();
            $data = array_intersect_key($data, array_flip([
                'id',
                'etag',
                'title',
                'description',
                'type_id',
                'url',
                'due_date',
                'recurring',
                'priority',
                'status',
                'created_at',
                'last_modified',
                'parent',
                'object',
            ]));

            // Parse the title to extract the todoable title and todo title
            if (isset($data['title'])) {
                $titleParts = explode('] ', $data['title'], 2);
                if (count($titleParts) === 2) {
                    $todoableTitle = trim($titleParts[0], '[]');
                    $todoTitle = $titleParts[1];

                    // Find the todoable model by title
                    $models = [
                        'PipelineItem' => PipelineItem::class,
                        // Add other models here as needed
                    ];

                    foreach ($models as $modelName => $modelClass) {
                        $todoable = $modelClass::where('title', $todoableTitle)->first();
                        if ($todoable) {
                            $data['todoable_type'] = 'App\\Models\\' . $modelName;
                            $data['todoable_id'] = $todoable->id;
                            break;
                        }
                    }
                }
            }

            Todo::upsert($data, 'id');
            $count++;
        }

        // Collect hrefs/URLs returned by the CalDAV server so we can remove local
        // todos that belong to this calendar but were deleted on the server.
        $hrefs = array_values(array_filter(array_map(function ($t) {
            return $t->url ?? null;
        }, $todos)));

        // Remove local todos that have a URL in this calendar but weren't returned
        // by the server (i.e. they were deleted remotely). Scope deletion by
        // calendar prefix to avoid touching other calendars.
        $calendarId = $service->getCalendarId();
        $username = config('caldav.username') ?? '';
        $calendarPrefix = 'calendars/' . $username . '/' . $calendarId;

        if ($calendarId && $username) {
            Todo::whereNotNull('url')
                ->where('url', 'like', '%' . $calendarPrefix . "%")
                ->whereNotIn('url', $hrefs ?: [''])
                ->delete();
        }

        // Remove old todos
        Todo::where('status', 'COMPLETED')
            ->where('last_modified', '<', now()->subDays(30)) // TODO: get from settings
            ->where('due_date', '<', now()->subDays(30))
            ->delete();

        Log::info("Synced " . count($todos) . " todos.");
        $this->info("Synced " . count($todos) . " todos.");

        return 0;
    }
}