<?php

namespace App\Domain\Integration;

use App\Jobs\SimulateCycleCompletion;
use App\Models\Machine;
use App\Models\MachineCommand;
use App\Models\MachineEvent;
use App\Models\MachineStatusHistory;
use Illuminate\Support\Carbon;
use Illuminate\Support\Str;

class SimulatedMachineProvider implements MachineProviderInterface
{
    public function startCycle(Machine $machine, array $payload): MachineCommandResult
    {
        $correlationId = (string) Str::uuid();
        $externalReference = 'sim-'.Str::random(12);
        $provider = config('laverie.simulation.provider_name', 'simulated');
        $durationSeconds = (int) config('laverie.simulation.cycle_duration_seconds', 30);
        $cycleEndsAt = now()->addSeconds($durationSeconds);

        $command = MachineCommand::query()->create([
            'uuid' => (string) Str::uuid(),
            'machine_id' => $machine->id,
            'provider' => $provider,
            'command_type' => 'start_cycle',
            'payload' => $payload,
            'status' => 'acknowledged',
            'external_reference' => $externalReference,
            'correlation_id' => $correlationId,
            'requested_by_user_id' => $payload['requested_by_user_id'] ?? null,
            'sent_at' => now(),
            'responded_at' => now(),
        ]);

        $previousStatus = $machine->status;

        $machine->update([
            'status' => 'running',
            'current_user_id' => $payload['requested_by_user_id'] ?? $machine->current_user_id,
            'cycle_started_at' => now(),
            'cycle_ends_at' => $cycleEndsAt,
            'last_heartbeat_at' => now(),
        ]);

        $this->recordStatusChange($machine, $previousStatus, 'running', $provider, 'cycle_started');
        $this->recordEvent($machine, $provider, 'cycle_started', [
            'command_uuid' => $command->uuid,
            'wash_uuid' => $payload['wash_uuid'] ?? null,
        ]);

        SimulateCycleCompletion::dispatch(
            $machine->id,
            $command->id,
            $payload['wash_id'] ?? null,
        )->delay($cycleEndsAt);

        return MachineCommandResult::success('acknowledged', $externalReference, $correlationId);
    }

    public function stopCycle(Machine $machine, array $payload = []): MachineCommandResult
    {
        $provider = config('laverie.simulation.provider_name', 'simulated');
        $correlationId = (string) Str::uuid();

        MachineCommand::query()->create([
            'uuid' => (string) Str::uuid(),
            'machine_id' => $machine->id,
            'provider' => $provider,
            'command_type' => 'stop_cycle',
            'payload' => $payload,
            'status' => 'acknowledged',
            'correlation_id' => $correlationId,
            'sent_at' => now(),
            'responded_at' => now(),
        ]);

        $previousStatus = $machine->status;

        $machine->update([
            'status' => 'available',
            'current_user_id' => null,
            'cycle_started_at' => null,
            'cycle_ends_at' => null,
            'last_heartbeat_at' => now(),
        ]);

        $this->recordStatusChange($machine, $previousStatus, 'available', $provider, 'cycle_stopped');
        $this->recordEvent($machine, $provider, 'cycle_completed', ['reason' => 'manual_stop']);

        return MachineCommandResult::success('acknowledged', null, $correlationId);
    }

    public function refreshStatus(Machine $machine): MachineStatusSnapshot
    {
        $machine->refresh();

        return new MachineStatusSnapshot(
            status: $machine->status,
            lastHeartbeat: $machine->last_heartbeat_at,
            metadata: [
                'cycle_started_at' => $machine->cycle_started_at?->toIso8601String(),
                'cycle_ends_at' => $machine->cycle_ends_at?->toIso8601String(),
                'current_user_id' => $machine->current_user_id,
            ],
        );
    }

    public function handleInboundEvent(array $payload): void
    {
        $externalMachineId = $payload['external_machine_id'] ?? $payload['machine_id'] ?? null;

        if ($externalMachineId === null) {
            return;
        }

        $integration = \App\Models\MachineIntegration::query()
            ->where('external_machine_id', (string) $externalMachineId)
            ->where('is_active', true)
            ->first();

        if ($integration === null) {
            return;
        }

        $machine = $integration->machine;
        $provider = $integration->provider;
        $eventType = $payload['event_type'] ?? 'status_changed';

        if ($eventType === 'heartbeat') {
            $machine->update(['last_heartbeat_at' => now()]);

            if ($machine->status === 'offline') {
                $previousStatus = $machine->status;
                $machine->update(['status' => 'available']);
                $this->recordStatusChange($machine, $previousStatus, 'available', $provider, 'heartbeat');
            }
        }

        if ($eventType === 'machine_offline') {
            $previousStatus = $machine->status;
            $machine->update(['status' => 'offline']);
            $this->recordStatusChange($machine, $previousStatus, 'offline', $provider, 'machine_offline');
        }

        if ($eventType === 'machine_online') {
            $previousStatus = $machine->status;
            $machine->update(['status' => 'available', 'last_heartbeat_at' => now()]);
            $this->recordStatusChange($machine, $previousStatus, 'available', $provider, 'machine_online');
        }

        if ($eventType === 'cycle_completed') {
            $previousStatus = $machine->status;
            $machine->update([
                'status' => 'available',
                'current_user_id' => null,
                'cycle_started_at' => null,
                'cycle_ends_at' => null,
                'last_heartbeat_at' => now(),
            ]);
            $this->recordStatusChange($machine, $previousStatus, 'available', $provider, 'cycle_completed');
        }

        if ($eventType === 'error_reported') {
            $previousStatus = $machine->status;
            $machine->update(['status' => 'error']);
            $this->recordStatusChange($machine, $previousStatus, 'error', $provider, 'error_reported');
        }

        $this->recordEvent(
            $machine,
            $provider,
            $eventType,
            $payload,
            $payload['external_event_id'] ?? null,
        );
    }

    private function recordStatusChange(
        Machine $machine,
        ?string $previousStatus,
        string $newStatus,
        string $source,
        string $reason,
    ): void {
        MachineStatusHistory::query()->create([
            'machine_id' => $machine->id,
            'previous_status' => $previousStatus,
            'new_status' => $newStatus,
            'source' => $source,
            'reason' => $reason,
            'created_at' => Carbon::now(),
        ]);
    }

    /**
     * @param  array<string, mixed>  $payload
     */
    private function recordEvent(
        Machine $machine,
        string $provider,
        string $eventType,
        array $payload,
        ?string $externalEventId = null,
    ): void {
        MachineEvent::query()->create([
            'machine_id' => $machine->id,
            'provider' => $provider,
            'external_event_id' => $externalEventId,
            'event_type' => $eventType,
            'payload' => $payload,
            'occurred_at' => now(),
            'received_at' => now(),
            'processed_at' => now(),
            'processing_status' => 'processed',
        ]);
    }
}