<?php

namespace Modules\IndustrialEngineering\Services;

use Illuminate\Support\Facades\DB;
use Modules\IndustrialEngineering\Models\BuildGenealogyEvent;
use Modules\IndustrialEngineering\Models\CustomerInstalledAsset;
use Modules\IndustrialEngineering\Models\SerializedUnit;
use Modules\IndustrialEngineering\Models\SerializedUnitComponent;
use Modules\IndustrialEngineering\Models\SerialRegistry;

class TraceabilityService
{
    public function __construct(
        protected BomService $bomService
    ) {
    }

    public function createSerializedUnit(
        int $businessId,
        string $unitCode,
        string $serialNumber,
        ?int $releasePackageId = null,
        ?int $workOrderId = null,
        ?int $lineRevisionId = null
    ): SerializedUnit {
        return DB::transaction(function () use ($businessId, $unitCode, $serialNumber, $releasePackageId, $workOrderId, $lineRevisionId) {
            $registry = SerialRegistry::create([
                'business_id' => $businessId,
                'serial_number' => $serialNumber,
                'serial_type' => 'unit',
                'status' => 'allocated',
                'manufactured_at' => now()->toDateString(),
            ]);

            return SerializedUnit::create([
                'business_id' => $businessId,
                'release_package_id' => $releasePackageId,
                'work_order_id' => $workOrderId,
                'line_revision_id' => $lineRevisionId,
                'serial_registry_id' => $registry->id,
                'unit_code' => $unitCode,
                'serial_number' => $serialNumber,
                'build_status' => 'in_progress',
                'build_started_at' => now()->toDateString(),
            ]);
        });
    }

    /**
     * Record a component installed on a serialized unit (as-built genealogy).
     */
    public function recordComponentInstallation(
        SerializedUnit $unit,
        array $componentData,
        ?int $performedBy = null
    ): SerializedUnitComponent {
        return DB::transaction(function () use ($unit, $componentData, $performedBy) {
            $serialRegistryId = null;
            if (! empty($componentData['serial_number'])) {
                $registry = SerialRegistry::firstOrCreate(
                    [
                        'business_id' => $unit->business_id,
                        'serial_number' => $componentData['serial_number'],
                    ],
                    [
                        'item_master_id' => $componentData['item_master_id'] ?? null,
                        'serial_type' => 'component',
                        'status' => 'installed',
                        'manufactured_at' => $componentData['manufactured_at'] ?? now()->toDateString(),
                        'manufacturer_id' => $componentData['manufacturer_id'] ?? null,
                    ]
                );
                $serialRegistryId = $registry->id;
            }

            $component = SerializedUnitComponent::create(array_merge([
                'business_id' => $unit->business_id,
                'serialized_unit_id' => $unit->id,
                'installed_at' => now()->toDateString(),
            ], $componentData, ['serial_registry_id' => $serialRegistryId]));

            BuildGenealogyEvent::create([
                'business_id' => $unit->business_id,
                'serialized_unit_id' => $unit->id,
                'event_type' => 'component_installed',
                'serialized_unit_component_id' => $component->id,
                'performed_by' => $performedBy ?? auth()->id(),
                'performed_at' => now(),
                'event_data' => $componentData,
            ]);

            return $component;
        });
    }

    public function completeBuild(SerializedUnit $unit): SerializedUnit
    {
        $unit->update([
            'build_status' => 'completed',
            'build_completed_at' => now()->toDateString(),
            'as_built_snapshot' => $this->buildAsBuiltSnapshot($unit),
        ]);

        if ($unit->serialRegistry) {
            $unit->serialRegistry->update(['status' => 'available']);
        }

        return $unit->fresh(['components.itemMaster', 'components.children']);
    }

    public function buildAsBuiltSnapshot(SerializedUnit $unit): array
    {
        $unit->load(['components.itemMaster', 'lineRevision', 'releasePackage']);

        return [
            'unit_id' => $unit->id,
            'serial_number' => $unit->serial_number,
            'line_revision_id' => $unit->line_revision_id,
            'components' => $unit->components->map(fn ($c) => [
                'id' => $c->id,
                'position_code' => $c->position_code,
                'label' => $c->component_label,
                'serial_number' => $c->serial_number,
                'brand' => $c->brand,
                'manufacturer' => $c->manufacturer,
                'model' => $c->model,
                'warranty_expires_at' => $c->warranty_expires_at?->toDateString(),
            ])->values()->all(),
            'snapshot_at' => now()->toIso8601String(),
        ];
    }

    /**
     * Register customer installed asset from sold serialized unit.
     */
    public function registerInstalledAsset(
        SerializedUnit $unit,
        int $customerId,
        string $assetCode,
        string $name,
        ?int $sellTransactionId = null,
        ?int $sellLineId = null,
        ?int $projectId = null
    ): CustomerInstalledAsset {
        return DB::transaction(function () use ($unit, $customerId, $assetCode, $name, $sellTransactionId, $sellLineId, $projectId) {
            $asBuilt = $this->buildAsBuiltSnapshot($unit);

            $asset = CustomerInstalledAsset::create([
                'business_id' => $unit->business_id,
                'serialized_unit_id' => $unit->id,
                'line_revision_id' => $unit->line_revision_id,
                'customer_id' => $customerId,
                'project_id' => $projectId,
                'sell_transaction_id' => $sellTransactionId,
                'sell_line_id' => $sellLineId,
                'asset_code' => $assetCode,
                'serial_number' => $unit->serial_number,
                'name' => $name,
                'installation_status' => 'pending',
                'sold_at' => now()->toDateString(),
                'as_sold_snapshot' => $asBuilt,
            ]);

            $unit->update(['build_status' => 'shipped']);

            return $asset;
        });
    }

    /**
     * Lookup by serial, asset code, or component serial.
     */
    public function lookup(int $businessId, string $query): array
    {
        $asset = CustomerInstalledAsset::forBusiness($businessId)
            ->with(['customer', 'serializedUnit.components.itemMaster', 'lineRevision.lineTemplate', 'warranties'])
            ->where(function ($q) use ($query) {
                $q->where('serial_number', $query)
                    ->orWhere('asset_code', $query);
            })
            ->first();

        if ($asset) {
            return ['type' => 'installed_asset', 'data' => $asset];
        }

        $component = SerializedUnitComponent::forBusiness($businessId)
            ->with(['serializedUnit', 'itemMaster', 'supplier'])
            ->where('serial_number', $query)
            ->orWhere('position_code', $query)
            ->first();

        if ($component) {
            return ['type' => 'component', 'data' => $component];
        }

        $unit = SerializedUnit::forBusiness($businessId)
            ->with(['components', 'lineRevision', 'installedAsset.customer'])
            ->where('serial_number', $query)
            ->orWhere('unit_code', $query)
            ->first();

        if ($unit) {
            return ['type' => 'serialized_unit', 'data' => $unit];
        }

        return ['type' => 'not_found', 'data' => null];
    }
}