<?php

namespace App\Jobs;

use App\Actions\Database\StartClickhouse;
use App\Actions\Database\StartDragonfly;
use App\Actions\Database\StartKeydb;
use App\Actions\Database\StartMariadb;
use App\Actions\Database\StartMongodb;
use App\Actions\Database\StartMysql;
use App\Actions\Database\StartPostgresql;
use App\Actions\Database\StartRedis;
use App\Enums\ProcessStatus;
use App\Events\DatabaseStatusChanged;
use App\Exceptions\DatabaseStartException;
use App\Models\StandaloneClickhouse;
use App\Models\StandaloneDragonfly;
use App\Models\StandaloneKeydb;
use App\Models\StandaloneMariadb;
use App\Models\StandaloneMongodb;
use App\Models\StandaloneMysql;
use App\Models\StandalonePostgresql;
use App\Models\StandaloneRedis;
use App\Support\ResourceStartActivity;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldBeEncrypted;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Cache;
use Spatie\Activitylog\Models\Activity;
use Throwable;

class DatabaseStartJob implements ShouldBeEncrypted, ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public int $tries = 1;

    public int $timeout = 600;

    public function __construct(
        public string $databaseClass,
        public int $databaseId,
        public int $teamId,
        public int $activityId,
        public ?int $userId,
    ) {
        $this->onQueue(deployment_queue());
    }

    public function handle(): void
    {
        $database = $this->databaseClass::query()->findOrFail($this->databaseId);
        abort_unless((int) $database->team()->id === $this->teamId, 403);
        $activity = Activity::query()->findOrFail($this->activityId);

        if (! $this->isStillRequested($activity, $database->uuid)) {
            event(new DatabaseStatusChanged($this->userId));

            return;
        }

        $lock = Cache::lock(ResourceStartActivity::databaseStartLockKey($database->uuid), ResourceStartActivity::DATABASE_START_LOCK_SECONDS);
        if (! $lock->get()) {
            ResourceStartActivity::markFailed($activity, ResourceStartActivity::ALREADY_STARTING_MESSAGE);
            event(new DatabaseStatusChanged($this->userId));

            return;
        }

        try {
            $this->runStart($database, $activity);
        } finally {
            $lock->release();
        }
    }

    /**
     * A start runs only while its activity is still queued and no newer start of the same
     * database was requested. A start that waited in a busy queue can be treated as stale and
     * replaced by a new one; without this check both would run one after the other.
     */
    private function isStillRequested(Activity $activity, string $databaseUuid): bool
    {
        if (data_get($activity, 'properties.status') !== ProcessStatus::QUEUED->value) {
            return false;
        }

        $newerStartExists = Activity::query()
            ->where('properties->type_uuid', $databaseUuid)
            ->where('properties->operation', ResourceStartActivity::DATABASE_START_OPERATION)
            ->whereIn('properties->status', [
                ProcessStatus::QUEUED->value,
                ProcessStatus::IN_PROGRESS->value,
                ProcessStatus::FINISHED->value,
            ])
            ->where('id', '>', $activity->getKey())
            ->exists();

        if ($newerStartExists) {
            ResourceStartActivity::markFailed($activity, ResourceStartActivity::SUPERSEDED_MESSAGE);

            return false;
        }

        return true;
    }

    private function runStart(Model $database, Activity $activity): void
    {
        $result = match ($database->getMorphClass()) {
            StandalonePostgresql::class => StartPostgresql::run($database, $activity),
            StandaloneRedis::class => StartRedis::run($database, $activity),
            StandaloneMongodb::class => StartMongodb::run($database, $activity),
            StandaloneMysql::class => StartMysql::run($database, $activity),
            StandaloneMariadb::class => StartMariadb::run($database, $activity),
            StandaloneKeydb::class => StartKeydb::run($database, $activity),
            StandaloneDragonfly::class => StartDragonfly::run($database, $activity),
            StandaloneClickhouse::class => StartClickhouse::run($database, $activity),
        };

        if (! $result instanceof Activity || data_get($result, 'properties.status') !== ProcessStatus::FINISHED->value) {
            throw DatabaseStartException::startCommandsDidNotRun();
        }

        event(new DatabaseStatusChanged($this->userId));
    }

    public function failed(?Throwable $exception): void
    {
        try {
            $activity = Activity::query()->find($this->activityId);
            if (! $activity) {
                return;
            }

            ResourceStartActivity::markFailed(
                $activity,
                $exception instanceof DatabaseStartException ? $exception->getMessage() : 'Database start failed.',
            );
        } finally {
            event(new DatabaseStatusChanged($this->userId));
        }
    }
}