<?php

namespace Tests\Unit\Observers;

use App\Models\Reclamation;
use App\Models\Reservation;
use App\Models\Shortage;
use App\Models\SparePart;
use App\Models\SparePartOrder;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class SparePartOrderObserverTest extends TestCase
{
    use RefreshDatabase;

    protected $seed = true;

    public function test_creating_order_with_in_stock_status_covers_shortages(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        // Create open shortage
        $shortage = Shortage::factory()
            ->open()
            ->withQuantities(5, 0) // required=5, reserved=0, missing=5
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(false)
            ->create();

        // Act - create order with in_stock status (observer should trigger)
        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Assert
        $shortage->refresh();

        // Shortage should be covered (status=closed when fully covered)
        $this->assertEquals(5, $shortage->reserved_qty);
        $this->assertEquals(0, $shortage->missing_qty);
        $this->assertEquals(Shortage::STATUS_CLOSED, $shortage->status);

        // Reservation should be created
        $this->assertDatabaseHas('reservations', [
            'spare_part_id' => $sparePart->id,
            'spare_part_order_id' => $order->id,
            'reclamation_id' => $reclamation->id,
            'reserved_qty' => 5,
            'status' => Reservation::STATUS_ACTIVE,
        ]);
    }

    public function test_creating_order_with_ordered_status_does_not_trigger_shortage_coverage(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        Shortage::factory()
            ->open()
            ->withQuantities(5, 0)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(false)
            ->create();

        // Act - create order with ordered status
        SparePartOrder::factory()
            ->ordered()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Assert - shortage should remain open
        $this->assertDatabaseHas('shortages', [
            'spare_part_id' => $sparePart->id,
            'reclamation_id' => $reclamation->id,
            'status' => Shortage::STATUS_OPEN,
            'missing_qty' => 5,
        ]);
    }

    public function test_updating_order_status_to_in_stock_covers_shortages(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        Shortage::factory()
            ->open()
            ->withQuantities(3, 0)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(true)
            ->create();

        // Create order with ordered status (not in_stock)
        $order = SparePartOrder::factory()
            ->ordered()
            ->withDocuments(true)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Act - update status to in_stock
        $order->update(['status' => SparePartOrder::STATUS_IN_STOCK]);

        // Assert
        $this->assertDatabaseHas('shortages', [
            'spare_part_id' => $sparePart->id,
            'reclamation_id' => $reclamation->id,
            'status' => Shortage::STATUS_CLOSED,
            'reserved_qty' => 3,
            'missing_qty' => 0,
        ]);
    }

    public function test_updating_other_fields_does_not_trigger_shortage_coverage(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        Shortage::factory()
            ->open()
            ->withQuantities(5, 0)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(false)
            ->create();

        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Clear the shortage that was covered on creation
        Shortage::query()->update([
            'status' => Shortage::STATUS_OPEN,
            'reserved_qty' => 0,
            'missing_qty' => 5,
        ]);
        Reservation::query()->delete();

        // Act - update note (not status)
        $order->update(['note' => 'Updated note']);

        // Assert - shortage should remain open (status didn't change)
        $this->assertDatabaseHas('shortages', [
            'spare_part_id' => $sparePart->id,
            'status' => Shortage::STATUS_OPEN,
            'missing_qty' => 5,
        ]);
    }

    public function test_observer_respects_with_documents_flag(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        // Create shortage requiring documents
        Shortage::factory()
            ->open()
            ->withQuantities(5, 0)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(true)
            ->create();

        // Act - create order WITHOUT documents
        SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false) // Different from shortage
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Assert - shortage should remain open (documents mismatch)
        $this->assertDatabaseHas('shortages', [
            'spare_part_id' => $sparePart->id,
            'with_documents' => true,
            'status' => Shortage::STATUS_OPEN,
            'missing_qty' => 5,
        ]);
    }

    public function test_observer_covers_multiple_shortages_fifo(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation1 = Reclamation::factory()->create();
        $reclamation2 = Reclamation::factory()->create();

        // Create older shortage
        $shortage1 = Shortage::factory()
            ->open()
            ->withQuantities(3, 0)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation1)
            ->withDocuments(false)
            ->create(['created_at' => now()->subDays(2)]);

        // Create newer shortage
        $shortage2 = Shortage::factory()
            ->open()
            ->withQuantities(4, 0)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation2)
            ->withDocuments(false)
            ->create(['created_at' => now()->subDay()]);

        // Act - create order with 5 items (should cover first fully, second partially)
        SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(5)
            ->forSparePart($sparePart)
            ->create();

        // Assert
        $shortage1->refresh();
        $shortage2->refresh();

        // First shortage fully covered (closed)
        $this->assertEquals(Shortage::STATUS_CLOSED, $shortage1->status);
        $this->assertEquals(3, $shortage1->reserved_qty);

        // Second shortage partially covered
        $this->assertEquals(Shortage::STATUS_OPEN, $shortage2->status);
        $this->assertEquals(2, $shortage2->reserved_qty);
        $this->assertEquals(2, $shortage2->missing_qty);
    }

    public function test_observer_does_not_cover_already_covered_shortages(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        // Create already covered shortage
        Shortage::factory()
            ->covered()
            ->withQuantities(5, 5) // fully covered
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(false)
            ->create();

        // Act
        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Assert - no new reservations for already covered shortage
        $this->assertEquals(0, Reservation::where('spare_part_order_id', $order->id)->count());
    }
}