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

namespace Magdev\WcComposableProduct\Tests\Unit;

use Magdev\WcComposableProduct\Tests\TestCase;
use Magdev\WcComposableProduct\CartHandler;
use Brain\Monkey\Functions;
use Brain\Monkey\Actions;
use Brain\Monkey\Filters;

class CartHandlerTest extends TestCase
{
    protected function setUp(): void
    {
        parent::setUp();

        // Clean up POST superglobal between tests
        $_POST = [];
    }

    protected function tearDown(): void
    {
        $_POST = [];
        parent::tearDown();
    }

    public function testConstructor_RegistersExpectedHooks(): void
    {
        $handler = new CartHandler();

        self::assertNotFalse(has_filter('woocommerce_add_to_cart_validation', 'Magdev\WcComposableProduct\CartHandler->validate_add_to_cart()'));
        self::assertNotFalse(has_filter('woocommerce_add_cart_item_data', 'Magdev\WcComposableProduct\CartHandler->add_cart_item_data()'));
        self::assertNotFalse(has_filter('woocommerce_get_cart_item_from_session', 'Magdev\WcComposableProduct\CartHandler->get_cart_item_from_session()'));
        self::assertNotFalse(has_filter('woocommerce_get_item_data', 'Magdev\WcComposableProduct\CartHandler->display_cart_item_data()'));
        self::assertNotFalse(has_action('woocommerce_before_calculate_totals', 'Magdev\WcComposableProduct\CartHandler->calculate_cart_item_price()'));
        self::assertNotFalse(has_action('woocommerce_single_product_summary', 'Magdev\WcComposableProduct\CartHandler->render_product_selector()'));
        self::assertNotFalse(has_filter('woocommerce_is_purchasable', 'Magdev\WcComposableProduct\CartHandler->hide_default_add_to_cart()'));
    }

    public function testHideDefaultAddToCart_ReturnsFalseForComposable(): void
    {
        $handler = new CartHandler();
        $product = $this->createProductMock(['get_type' => 'composable']);

        $result = $handler->hide_default_add_to_cart(true, $product);
        $this->assertFalse($result);
    }

    public function testHideDefaultAddToCart_PassesThroughForSimple(): void
    {
        $handler = new CartHandler();
        $product = $this->createProductMock(['get_type' => 'simple']);

        $result = $handler->hide_default_add_to_cart(true, $product);
        $this->assertTrue($result);
    }

    public function testValidateAddToCart_PassesThroughForNonComposable(): void
    {
        $product = $this->createProductMock(['get_type' => 'simple']);
        Functions\expect('wc_get_product')->with(1)->andReturn($product);

        $handler = new CartHandler();
        $result = $handler->validate_add_to_cart(true, 1, 1);

        $this->assertTrue($result);
    }

    public function testValidateAddToCart_ReturnsFalseWhenNoProductsSelected(): void
    {
        $product = $this->createProductMock(['get_type' => 'composable']);
        Functions\expect('wc_get_product')->with(1)->andReturn($product);
        Functions\expect('wc_add_notice')->once();

        $_POST['composable_products'] = [];

        $handler = new CartHandler();
        $result = $handler->validate_add_to_cart(true, 1, 1);

        $this->assertFalse($result);
    }

    public function testValidateAddToCart_ReturnsFalseWhenNoPostData(): void
    {
        $product = $this->createProductMock(['get_type' => 'composable']);
        Functions\expect('wc_get_product')->with(1)->andReturn($product);
        Functions\expect('wc_add_notice')->once();

        // No $_POST['composable_products'] at all
        $handler = new CartHandler();
        $result = $handler->validate_add_to_cart(true, 1, 1);

        $this->assertFalse($result);
    }

    public function testAddCartItemData_AddsSelectionsForComposable(): void
    {
        $product = $this->createProductMock(['get_type' => 'composable']);
        Functions\expect('wc_get_product')->with(1)->andReturn($product);
        Functions\expect('absint')->andReturnUsing(function ($val) {
            return abs((int) $val);
        });

        $_POST['composable_products'] = ['101', '102'];

        $handler = new CartHandler();
        $result = $handler->add_cart_item_data([], 1);

        $this->assertArrayHasKey('composable_products', $result);
        $this->assertSame([101, 102], $result['composable_products']);
        $this->assertArrayHasKey('unique_key', $result);
    }

    public function testAddCartItemData_PassesThroughForNonComposable(): void
    {
        $product = $this->createProductMock(['get_type' => 'simple']);
        Functions\expect('wc_get_product')->with(1)->andReturn($product);

        $handler = new CartHandler();
        $result = $handler->add_cart_item_data(['existing' => 'data'], 1);

        $this->assertSame(['existing' => 'data'], $result);
    }

    public function testGetCartItemFromSession_RestoresComposableProducts(): void
    {
        $handler = new CartHandler();
        $result = $handler->get_cart_item_from_session(
            ['data' => 'test'],
            ['composable_products' => [101, 102]]
        );

        $this->assertSame([101, 102], $result['composable_products']);
    }

    public function testGetCartItemFromSession_PassesThroughWithoutComposableData(): void
    {
        $handler = new CartHandler();
        $result = $handler->get_cart_item_from_session(
            ['data' => 'test'],
            []
        );

        $this->assertArrayNotHasKey('composable_products', $result);
    }

    public function testDisplayCartItemData_FormatsProductNames(): void
    {
        $mock1 = $this->createProductMock(['get_name' => 'Product A']);
        $mock2 = $this->createProductMock(['get_name' => 'Product B']);

        Functions\expect('wc_get_product')
            ->andReturnUsing(function ($id) use ($mock1, $mock2) {
                return match ($id) {
                    101 => $mock1,
                    102 => $mock2,
                    default => false,
                };
            });

        $handler = new CartHandler();
        $result = $handler->display_cart_item_data(
            [],
            ['composable_products' => [101, 102]]
        );

        $this->assertCount(1, $result);
        $this->assertStringContainsString('Product A', $result[0]['value']);
        $this->assertStringContainsString('Product B', $result[0]['value']);
    }

    public function testDisplayCartItemData_ReturnsEmptyForNonComposable(): void
    {
        $handler = new CartHandler();
        $result = $handler->display_cart_item_data([], []);

        $this->assertSame([], $result);
    }
}