#!/usr/bin/env node
/**
 * Test script for checkout shipping cost calculation
 * Creates a checkout via API and verifies totalPrice includes shipping
 */

const SALEOR_API_URL = process.env.NEXT_PUBLIC_SALEOR_API_URL || 'https://api.manoonoils.com/graphql/';

// Test data
const TEST_VARIANT_ID = 'UHJvZHVjdFZhcmlhbnQ6Mjk0'; // Replace with actual variant ID
const TEST_EMAIL = 'test@example.com';

const TEST_SHIPPING_ADDRESS = {
  firstName: 'Test',
  lastName: 'User',
  streetAddress1: '123 Test Street',
  city: 'Belgrade',
  postalCode: '11000',
  country: 'RS',
  phone: '+38160123456'
};

async function saleorFetch(query, variables = {}, token = null) {
  const headers = {
    'Content-Type': 'application/json',
  };
  
  if (token) {
    headers['Authorization'] = `JWT ${token}`;
  }

  const response = await fetch(SALEOR_API_URL, {
    method: 'POST',
    headers,
    body: JSON.stringify({ query, variables }),
  });

  if (!response.ok) {
    throw new Error(`HTTP error! status: ${response.status}`);
  }

  const result = await response.json();
  
  if (result.errors) {
    throw new Error(`GraphQL errors: ${JSON.stringify(result.errors)}`);
  }

  return result.data;
}

async function testCheckoutWithShipping() {
  console.log('🧪 Testing checkout shipping cost calculation...\n');

  try {
    // Step 1: Create checkout
    console.log('Step 1: Creating checkout...');
    const checkoutCreateMutation = `
      mutation CheckoutCreate($input: CheckoutCreateInput!) {
        checkoutCreate(input: $input) {
          checkout {
            id
            token
            totalPrice {
              gross {
                amount
                currency
              }
            }
            subtotalPrice {
              gross {
                amount
                currency
              }
            }
          }
          errors {
            field
            message
          }
        }
      }
    `;

    const checkoutResult = await saleorFetch(checkoutCreateMutation, {
      input: {
        channel: 'default-channel',
        email: TEST_EMAIL,
        lines: [],
        languageCode: 'SR'
      }
    });

    if (checkoutResult.checkoutCreate.errors?.length > 0) {
      throw new Error(`Checkout creation failed: ${checkoutResult.checkoutCreate.errors[0].message}`);
    }

    const checkout = checkoutResult.checkoutCreate.checkout;
    console.log(`✅ Checkout created: ${checkout.id}`);
    console.log(`   Token: ${checkout.token}`);
    console.log(`   Initial total: ${checkout.totalPrice.gross.amount} ${checkout.totalPrice.gross.currency}\n`);

    // Step 2: Add product to checkout
    console.log('Step 2: Adding product to checkout...');
    const linesAddMutation = `
      mutation CheckoutLinesAdd($checkoutId: ID!, $lines: [CheckoutLineInput!]!) {
        checkoutLinesAdd(checkoutId: $checkoutId, lines: $lines) {
          checkout {
            id
            totalPrice {
              gross {
                amount
                currency
              }
            }
            subtotalPrice {
              gross {
                amount
                currency
              }
            }
            lines {
              id
              quantity
              totalPrice {
                gross {
                  amount
                }
              }
            }
          }
          errors {
            field
            message
          }
        }
      }
    `;

    // First, let's query for available products to get a real variant ID
    console.log('   Querying available products...');
    const productsQuery = `
      query Products {
        products(channel: "default-channel", first: 1) {
          edges {
            node {
              id
              name
              variants {
                id
                name
              }
            }
          }
        }
      }
    `;

    const productsResult = await saleorFetch(productsQuery);
    const product = productsResult.products.edges[0]?.node;
    
    if (!product || !product.variants?.[0]) {
      throw new Error('No products found in store');
    }

    const variantId = product.variants[0].id;
    console.log(`   Product: ${product.name}, Variant: ${product.variants[0].name}`);

    const linesResult = await saleorFetch(linesAddMutation, {
      checkoutId: checkout.id,
      lines: [{ variantId, quantity: 1 }]
    });

    if (linesResult.checkoutLinesAdd.errors?.length > 0) {
      throw new Error(`Adding lines failed: ${linesResult.checkoutLinesAdd.errors[0].message}`);
    }

    const checkoutWithLines = linesResult.checkoutLinesAdd.checkout;
    const productTotal = checkoutWithLines.totalPrice.gross.amount;
    console.log(`✅ Product added (qty: 1)`);
    console.log(`   Product total: ${productTotal} RSD\n`);

    // Step 3: Set shipping address
    console.log('Step 3: Setting shipping address...');
    const shippingAddressMutation = `
      mutation CheckoutShippingAddressUpdate($checkoutId: ID!, $shippingAddress: AddressInput!) {
        checkoutShippingAddressUpdate(checkoutId: $checkoutId, shippingAddress: $shippingAddress) {
          checkout {
            id
            shippingMethods {
              id
              name
              price {
                amount
                currency
              }
            }
          }
          errors {
            field
            message
          }
        }
      }
    `;

    const shippingResult = await saleorFetch(shippingAddressMutation, {
      checkoutId: checkout.id,
      shippingAddress: TEST_SHIPPING_ADDRESS
    });

    if (shippingResult.checkoutShippingAddressUpdate.errors?.length > 0) {
      throw new Error(`Setting shipping address failed: ${shippingResult.checkoutShippingAddressUpdate.errors[0].message}`);
    }

    const availableMethods = shippingResult.checkoutShippingAddressUpdate.checkout.shippingMethods;
    console.log(`✅ Shipping address set`);
    console.log(`   Available shipping methods: ${availableMethods.length}`);
    
    if (availableMethods.length === 0) {
      console.log('   ⚠️ No shipping methods available for this address/region');
      return;
    }

    availableMethods.forEach((method, i) => {
      console.log(`   [${i + 1}] ${method.name}: ${method.price.amount} ${method.price.currency}`);
    });
    console.log('');

    // Step 4: Set shipping method
    const selectedMethod = availableMethods[0];
    console.log(`Step 4: Selecting shipping method: ${selectedMethod.name} (${selectedMethod.price.amount} RSD)...`);

    const shippingMethodMutation = `
      mutation CheckoutShippingMethodUpdate($checkoutId: ID!, $shippingMethodId: ID!) {
        checkoutShippingMethodUpdate(checkoutId: $checkoutId, shippingMethodId: $shippingMethodId) {
          checkout {
            id
            totalPrice {
              gross {
                amount
                currency
              }
            }
            subtotalPrice {
              gross {
                amount
                currency
              }
            }
            shippingPrice {
              gross {
                amount
                currency
              }
            }
          }
          errors {
            field
            message
          }
        }
      }
    `;

    const methodResult = await saleorFetch(shippingMethodMutation, {
      checkoutId: checkout.id,
      shippingMethodId: selectedMethod.id
    });

    if (methodResult.checkoutShippingMethodUpdate.errors?.length > 0) {
      throw new Error(`Setting shipping method failed: ${methodResult.checkoutShippingMethodUpdate.errors[0].message}`);
    }

    const finalCheckout = methodResult.checkoutShippingMethodUpdate.checkout;
    const subtotal = finalCheckout.subtotalPrice.gross.amount;
    const shipping = finalCheckout.shippingPrice.gross.amount;
    const finalTotal = finalCheckout.totalPrice.gross.amount;
    const expectedTotal = subtotal + shipping;

    console.log(`✅ Shipping method set`);
    console.log(`   Subtotal: ${subtotal} RSD`);
    console.log(`   Shipping: ${shipping} RSD`);
    console.log(`   Total: ${finalTotal} RSD`);
    console.log(`   Expected: ${expectedTotal} RSD`);
    console.log('');

    // Verification
    console.log('📊 VERIFICATION:');
    if (finalTotal === expectedTotal) {
      console.log('✅ PASS: Total includes shipping cost correctly');
      console.log(`   ${subtotal} + ${shipping} = ${finalTotal}`);
    } else {
      console.log('❌ FAIL: Total does NOT include shipping cost');
      console.log(`   Expected: ${expectedTotal}, Got: ${finalTotal}`);
      console.log(`   Difference: ${expectedTotal - finalTotal}`);
    }

    // Cleanup - delete checkout
    console.log('\n🧹 Cleaning up test checkout...');
    // Note: Checkout deletion requires admin permissions
    console.log(`   Checkout ID for manual cleanup: ${checkout.id}`);

  } catch (error) {
    console.error('\n❌ Test failed:', error.message);
    process.exit(1);
  }
}

// Run the test
testCheckoutWithShipping();