<?php
/**
 * StockManager Tests
 *
 * @package Magdev\WcComposableProduct\Tests
 */

namespace Magdev\WcComposableProduct\Tests\Unit;

use Magdev\WcComposableProduct\Tests\TestCase;
use Magdev\WcComposableProduct\StockManager;
use Brain\Monkey\Functions;

class StockManagerTest extends TestCase
{
    private StockManager $manager;

    protected function setUp(): void
    {
        parent::setUp();
        $this->manager = new StockManager();
    }

    // --- validate_stock_availability ---

    public function testValidateStock_ReturnsTrueWhenAllInStock(): void
    {
        $mock = $this->createProductMock([
            'managing_stock' => false,
            'is_in_stock' => true,
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);
        Functions\expect('wc_get_product')->with(2)->andReturn($mock);

        $result = $this->manager->validate_stock_availability([1, 2]);
        $this->assertTrue($result);
    }

    public function testValidateStock_ReturnsTrueWhenNotManagingStock(): void
    {
        $mock = $this->createProductMock(['managing_stock' => false]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $result = $this->manager->validate_stock_availability([1]);
        $this->assertTrue($result);
    }

    public function testValidateStock_ReturnsErrorForOutOfStock(): void
    {
        $mock = $this->createProductMock([
            'managing_stock' => true,
            'is_in_stock' => false,
            'get_name' => 'Widget',
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $result = $this->manager->validate_stock_availability([1]);
        $this->assertIsString($result);
        $this->assertStringContainsString('Widget', $result);
    }

    public function testValidateStock_ReturnsErrorForInsufficientQuantity(): void
    {
        $mock = $this->createProductMock([
            'managing_stock' => true,
            'is_in_stock' => true,
            'get_stock_quantity' => 1,
            'get_name' => 'Widget',
            'backorders_allowed' => false,
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $result = $this->manager->validate_stock_availability([1], 5);
        $this->assertIsString($result);
        $this->assertStringContainsString('Widget', $result);
    }

    public function testValidateStock_PassesWhenBackordersAllowed(): void
    {
        // When stock_quantity is null the insufficient-stock check is skipped,
        // and the backorders_allowed() branch is reached.
        $mock = $this->createProductMock([
            'managing_stock' => true,
            'is_in_stock' => true,
            'get_stock_quantity' => null,
            'backorders_allowed' => true,
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $result = $this->manager->validate_stock_availability([1], 5);
        $this->assertTrue($result);
    }

    public function testValidateStock_SkipsNullProducts(): void
    {
        Functions\expect('wc_get_product')->with(999)->andReturn(false);

        $result = $this->manager->validate_stock_availability([999]);
        $this->assertTrue($result);
    }

    // --- get_product_stock_info ---

    public function testGetProductStockInfo_ReturnsCorrectStructure(): void
    {
        $mock = $this->createProductMock([
            'is_in_stock' => true,
            'get_stock_quantity' => 10,
            'backorders_allowed' => false,
            'get_stock_status' => 'instock',
            'managing_stock' => true,
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $info = $this->manager->get_product_stock_info(1);

        $this->assertTrue($info['in_stock']);
        $this->assertSame(10, $info['stock_quantity']);
        $this->assertFalse($info['backorders_allowed']);
        $this->assertSame('instock', $info['stock_status']);
        $this->assertTrue($info['managing_stock']);
        $this->assertTrue($info['has_enough_stock']);
    }

    public function testGetProductStockInfo_ReturnsFallbackForInvalidProduct(): void
    {
        Functions\expect('wc_get_product')->with(999)->andReturn(false);

        $info = $this->manager->get_product_stock_info(999);

        $this->assertFalse($info['in_stock']);
        $this->assertSame(0, $info['stock_quantity']);
        $this->assertFalse($info['backorders_allowed']);
        $this->assertSame('outofstock', $info['stock_status']);
    }

    public function testGetProductStockInfo_HasEnoughStockTrueWhenNotManaging(): void
    {
        $mock = $this->createProductMock([
            'managing_stock' => false,
            'get_stock_quantity' => null,
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $info = $this->manager->get_product_stock_info(1, 100);
        $this->assertTrue($info['has_enough_stock']);
    }

    public function testGetProductStockInfo_HasEnoughStockFalseWhenInsufficient(): void
    {
        $mock = $this->createProductMock([
            'managing_stock' => true,
            'get_stock_quantity' => 2,
        ]);

        Functions\expect('wc_get_product')->with(1)->andReturn($mock);

        $info = $this->manager->get_product_stock_info(1, 5);
        $this->assertFalse($info['has_enough_stock']);
    }

    // --- prevent_composable_stock_reduction ---

    public function testPreventStockReduction_ReturnsFalseForComposableItem(): void
    {
        $productMock = $this->createProductMock(['get_type' => 'composable']);

        $itemMock = \Mockery::mock('WC_Order_Item_Product');
        $itemMock->shouldReceive('get_product')->andReturn($productMock);

        $orderMock = \Mockery::mock('WC_Order');
        $orderMock->shouldReceive('get_items')->andReturn([$itemMock]);

        $result = $this->manager->prevent_composable_stock_reduction(true, $orderMock);
        $this->assertFalse($result);
    }

    public function testPreventStockReduction_PassesThroughForNonComposable(): void
    {
        $productMock = $this->createProductMock(['get_type' => 'simple']);

        $itemMock = \Mockery::mock('WC_Order_Item_Product');
        $itemMock->shouldReceive('get_product')->andReturn($productMock);

        $orderMock = \Mockery::mock('WC_Order');
        $orderMock->shouldReceive('get_items')->andReturn([$itemMock]);

        $result = $this->manager->prevent_composable_stock_reduction(true, $orderMock);
        $this->assertTrue($result);
    }

    // --- store_selected_products_in_order ---

    public function testStoreSelectedProducts_AddsMetaWhenPresent(): void
    {
        $itemMock = \Mockery::mock('WC_Order_Item_Product');
        $itemMock->shouldReceive('add_meta_data')
            ->once()
            ->with('_composable_products', [1, 2], true);

        $this->manager->store_selected_products_in_order(
            $itemMock,
            'cart_key',
            ['composable_products' => [1, 2]]
        );
    }

    public function testStoreSelectedProducts_DoesNothingWithoutData(): void
    {
        $itemMock = \Mockery::mock('WC_Order_Item_Product');
        $itemMock->shouldNotReceive('add_meta_data');

        $this->manager->store_selected_products_in_order(
            $itemMock,
            'cart_key',
            []
        );
    }
}