<?php

namespace Tests\Unit\Services;

use App\Models\InventoryMovement;
use App\Models\Reclamation;
use App\Models\Reservation;
use App\Models\Shortage;
use App\Models\SparePart;
use App\Models\SparePartOrder;
use App\Services\ReservationResult;
use App\Services\ShortageService;
use App\Services\SparePartReservationService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class SparePartReservationServiceTest extends TestCase
{
    use RefreshDatabase;

    protected $seed = true;

    private SparePartReservationService $service;
    private ShortageService $shortageService;

    protected function setUp(): void
    {
        parent::setUp();

        $this->shortageService = new ShortageService();
        $this->service = new SparePartReservationService($this->shortageService);
    }

    public function test_reserve_with_sufficient_stock_creates_reservation(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Act
        $result = $this->service->reserve(
            sparePartId: $sparePart->id,
            quantity: 5,
            withDocuments: false,
            reclamationId: $reclamation->id
        );

        // Assert
        $this->assertInstanceOf(ReservationResult::class, $result);
        $this->assertEquals(5, $result->reserved);
        $this->assertEquals(0, $result->missing);
        $this->assertTrue($result->isFullyReserved());
        $this->assertFalse($result->hasShortage());
        $this->assertCount(1, $result->reservations);

        // Check reservation was created in DB
        $this->assertDatabaseHas('reservations', [
            'spare_part_id' => $sparePart->id,
            'spare_part_order_id' => $order->id,
            'reclamation_id' => $reclamation->id,
            'reserved_qty' => 5,
            'with_documents' => false,
            'status' => Reservation::STATUS_ACTIVE,
        ]);

        // Check inventory movement was created
        $this->assertDatabaseHas('inventory_movements', [
            'spare_part_id' => $sparePart->id,
            'spare_part_order_id' => $order->id,
            'qty' => 5,
            'movement_type' => InventoryMovement::TYPE_RESERVE,
            'source_type' => InventoryMovement::SOURCE_RECLAMATION,
            'source_id' => $reclamation->id,
        ]);
    }

    public function test_reserve_with_partial_stock_creates_shortage(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(3)
            ->forSparePart($sparePart)
            ->create();

        // Act
        $result = $this->service->reserve(
            sparePartId: $sparePart->id,
            quantity: 5,
            withDocuments: false,
            reclamationId: $reclamation->id
        );

        // Assert
        $this->assertEquals(3, $result->reserved);
        $this->assertEquals(2, $result->missing);
        $this->assertFalse($result->isFullyReserved());
        $this->assertTrue($result->hasShortage());

        // Check shortage was created
        $this->assertDatabaseHas('shortages', [
            'spare_part_id' => $sparePart->id,
            'reclamation_id' => $reclamation->id,
            'with_documents' => false,
            'required_qty' => 5,
            'reserved_qty' => 3,
            'missing_qty' => 2,
            'status' => Shortage::STATUS_OPEN,
        ]);
    }

    public function test_reserve_with_no_stock_creates_full_shortage(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        // No orders created = no stock

        // Act
        $result = $this->service->reserve(
            sparePartId: $sparePart->id,
            quantity: 5,
            withDocuments: false,
            reclamationId: $reclamation->id
        );

        // Assert
        $this->assertEquals(0, $result->reserved);
        $this->assertEquals(5, $result->missing);
        $this->assertFalse($result->isFullyReserved());
        $this->assertTrue($result->hasShortage());
        $this->assertEmpty($result->reservations);

        // Check full shortage was created
        $this->assertDatabaseHas('shortages', [
            'spare_part_id' => $sparePart->id,
            'reclamation_id' => $reclamation->id,
            'required_qty' => 5,
            'reserved_qty' => 0,
            'missing_qty' => 5,
            'status' => Shortage::STATUS_OPEN,
        ]);
    }

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

        // Create first batch (older)
        $olderOrder = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(3)
            ->forSparePart($sparePart)
            ->create(['created_at' => now()->subDays(2)]);

        // Create second batch (newer)
        $newerOrder = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(5)
            ->forSparePart($sparePart)
            ->create(['created_at' => now()->subDay()]);

        // Act - reserve 5 items (should use 3 from older + 2 from newer)
        $result = $this->service->reserve(
            sparePartId: $sparePart->id,
            quantity: 5,
            withDocuments: false,
            reclamationId: $reclamation->id
        );

        // Assert
        $this->assertEquals(5, $result->reserved);
        $this->assertCount(2, $result->reservations);

        // Check FIFO: first batch fully used
        $this->assertDatabaseHas('reservations', [
            'spare_part_order_id' => $olderOrder->id,
            'reserved_qty' => 3,
        ]);

        // Check FIFO: second batch partially used
        $this->assertDatabaseHas('reservations', [
            'spare_part_order_id' => $newerOrder->id,
            'reserved_qty' => 2,
        ]);
    }

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

        // Create batch WITHOUT documents
        SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Create batch WITH documents
        $orderWithDocs = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(true)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Act - reserve WITH documents
        $result = $this->service->reserve(
            sparePartId: $sparePart->id,
            quantity: 5,
            withDocuments: true,
            reclamationId: $reclamation->id
        );

        // Assert - should only use batch with documents
        $this->assertEquals(5, $result->reserved);
        $this->assertCount(1, $result->reservations);

        $this->assertDatabaseHas('reservations', [
            'spare_part_order_id' => $orderWithDocs->id,
            'with_documents' => true,
        ]);
    }

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

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

        // Create existing active reservation for 7 items
        Reservation::factory()
            ->active()
            ->withQuantity(7)
            ->fromOrder($order)
            ->forReclamation($reclamation1)
            ->create();

        // Act - try to reserve 5 more (only 3 available)
        $result = $this->service->reserve(
            sparePartId: $sparePart->id,
            quantity: 5,
            withDocuments: false,
            reclamationId: $reclamation2->id
        );

        // Assert
        $this->assertEquals(3, $result->reserved);
        $this->assertEquals(2, $result->missing);
        $this->assertTrue($result->hasShortage());
    }

    public function test_cancel_for_reclamation_cancels_all_reservations(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(10)
            ->forSparePart($sparePart)
            ->create();

        // Create reservations
        Reservation::factory()
            ->active()
            ->withQuantity(3)
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        Reservation::factory()
            ->active()
            ->withQuantity(2)
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        // Create shortage
        Shortage::factory()
            ->open()
            ->withQuantities(10, 5)
            ->forSparePart($sparePart)
            ->forReclamation($reclamation)
            ->withDocuments(false)
            ->create();

        // Act
        $cancelled = $this->service->cancelForReclamation($reclamation->id);

        // Assert
        $this->assertEquals(5, $cancelled);

        // Check all reservations are cancelled
        $this->assertDatabaseMissing('reservations', [
            'reclamation_id' => $reclamation->id,
            'status' => Reservation::STATUS_ACTIVE,
        ]);

        $this->assertEquals(2, Reservation::where('reclamation_id', $reclamation->id)
            ->where('status', Reservation::STATUS_CANCELLED)->count());

        // Check shortage is closed
        $this->assertDatabaseHas('shortages', [
            'reclamation_id' => $reclamation->id,
            'status' => Shortage::STATUS_CLOSED,
        ]);
    }

    public function test_cancel_for_reclamation_filters_by_spare_part(): void
    {
        // Arrange
        $sparePart1 = SparePart::factory()->create();
        $sparePart2 = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();

        $order1 = SparePartOrder::factory()
            ->inStock()
            ->forSparePart($sparePart1)
            ->create();

        $order2 = SparePartOrder::factory()
            ->inStock()
            ->forSparePart($sparePart2)
            ->create();

        $reservation1 = Reservation::factory()
            ->active()
            ->withQuantity(3)
            ->fromOrder($order1)
            ->forReclamation($reclamation)
            ->create();

        $reservation2 = Reservation::factory()
            ->active()
            ->withQuantity(5)
            ->fromOrder($order2)
            ->forReclamation($reclamation)
            ->create();

        // Act - cancel only for sparePart1
        $cancelled = $this->service->cancelForReclamation(
            $reclamation->id,
            sparePartId: $sparePart1->id
        );

        // Assert
        $this->assertEquals(3, $cancelled);

        $this->assertDatabaseHas('reservations', [
            'id' => $reservation1->id,
            'status' => Reservation::STATUS_CANCELLED,
        ]);

        $this->assertDatabaseHas('reservations', [
            'id' => $reservation2->id,
            'status' => Reservation::STATUS_ACTIVE,
        ]);
    }

    public function test_get_reservations_for_reclamation_returns_active_only(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        $order = SparePartOrder::factory()
            ->inStock()
            ->forSparePart($sparePart)
            ->create();

        Reservation::factory()
            ->active()
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        Reservation::factory()
            ->cancelled()
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        Reservation::factory()
            ->issued()
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        // Act
        $reservations = $this->service->getReservationsForReclamation($reclamation->id);

        // Assert
        $this->assertCount(1, $reservations);
        $this->assertEquals(Reservation::STATUS_ACTIVE, $reservations->first()->status);
    }

    public function test_adjust_reservation_increases_quantity(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(20)
            ->forSparePart($sparePart)
            ->create();

        // Initial reservation of 5
        Reservation::factory()
            ->active()
            ->withQuantity(5)
            ->withDocuments(false)
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        // Act - increase to 10
        $result = $this->service->adjustReservation(
            reclamationId: $reclamation->id,
            sparePartId: $sparePart->id,
            withDocuments: false,
            newQuantity: 10
        );

        // Assert - should have reserved additional 5
        $this->assertEquals(5, $result->reserved);
        $this->assertEquals(0, $result->missing);

        $totalReserved = Reservation::where('reclamation_id', $reclamation->id)
            ->where('spare_part_id', $sparePart->id)
            ->where('status', Reservation::STATUS_ACTIVE)
            ->sum('reserved_qty');

        $this->assertEquals(10, $totalReserved);
    }

    public function test_adjust_reservation_decreases_quantity(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        $order = SparePartOrder::factory()
            ->inStock()
            ->withDocuments(false)
            ->withQuantity(20)
            ->forSparePart($sparePart)
            ->create();

        // Initial reservation of 10
        Reservation::factory()
            ->active()
            ->withQuantity(10)
            ->withDocuments(false)
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        // Act - decrease to 3
        $result = $this->service->adjustReservation(
            reclamationId: $reclamation->id,
            sparePartId: $sparePart->id,
            withDocuments: false,
            newQuantity: 3
        );

        // Assert
        $this->assertEquals(3, $result->reserved);
        $this->assertEquals(0, $result->missing);
    }

    public function test_cancel_reservation_does_not_cancel_non_active(): void
    {
        // Arrange
        $sparePart = SparePart::factory()->create();
        $reclamation = Reclamation::factory()->create();
        $order = SparePartOrder::factory()
            ->inStock()
            ->forSparePart($sparePart)
            ->create();

        $reservation = Reservation::factory()
            ->issued()
            ->fromOrder($order)
            ->forReclamation($reclamation)
            ->create();

        // Act
        $result = $this->service->cancelReservation($reservation);

        // Assert
        $this->assertFalse($result);
        $this->assertDatabaseHas('reservations', [
            'id' => $reservation->id,
            'status' => Reservation::STATUS_ISSUED,
        ]);
    }
}