import { toast } from "sonner";

// Shopify API Configuration
const SHOPIFY_API_VERSION = '2025-07';
const SHOPIFY_STORE_PERMANENT_DOMAIN = 'sweet-office-treats-2ar62.myshopify.com';
const SHOPIFY_STOREFRONT_URL = `https://${SHOPIFY_STORE_PERMANENT_DOMAIN}/api/${SHOPIFY_API_VERSION}/graphql.json`;
const SHOPIFY_STOREFRONT_TOKEN = 'd9c2c43fc30d96d1742cc76da58c4ddb';

export interface ShopifyProduct {
  node: {
    id: string;
    title: string;
    description: string;
    handle: string;
    priceRange: {
      minVariantPrice: {
        amount: string;
        currencyCode: string;
      };
    };
    images: {
      edges: Array<{
        node: {
          url: string;
          altText: string | null;
        };
      }>;
    };
    variants: {
      edges: Array<{
        node: {
          id: string;
          title: string;
          price: {
            amount: string;
            currencyCode: string;
          };
          availableForSale: boolean;
          selectedOptions: Array<{
            name: string;
            value: string;
          }>;
        };
      }>;
    };
    sellingPlanGroups?: {
      edges: Array<{
        node: {
          name: string;
          sellingPlans: {
            edges: Array<{
              node: {
                id: string;
                name: string;
              };
            }>;
          };
        };
      }>;
    };
    options: Array<{
      name: string;
      values: string[];
    }>;
  };
}

// Storefront API helper function
export async function storefrontApiRequest(query: string, variables: Record<string, unknown> = {}) {
  const response = await fetch(SHOPIFY_STOREFRONT_URL, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-Shopify-Storefront-Access-Token': SHOPIFY_STOREFRONT_TOKEN
    },
    body: JSON.stringify({
      query,
      variables,
    }),
  });

  if (response.status === 402) {
    toast.error("Shopify: Betalning krävs", {
      description: "Shopify API kräver en aktiv betalplan. Besök admin.shopify.com för att uppgradera.",
    });
    return null;
  }

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

  const data = await response.json();
  
  if (data.errors) {
    throw new Error(`Error calling Shopify: ${data.errors.map((e: { message: string }) => e.message).join(', ')}`);
  }

  return data;
}

// Fetch products query
export const STOREFRONT_PRODUCTS_QUERY = `
  query GetProducts($first: Int!, $query: String) {
    products(first: $first, query: $query) {
      edges {
        node {
          id
          title
          description
          handle
          priceRange {
            minVariantPrice {
              amount
              currencyCode
            }
          }
          images(first: 5) {
            edges {
              node {
                url
                altText
              }
            }
          }
          variants(first: 10) {
            edges {
              node {
                id
                title
                price {
                  amount
                  currencyCode
                }
                availableForSale
                selectedOptions {
                  name
                  value
                }
              }
            }
          }
          sellingPlanGroups(first: 5) {
            edges {
              node {
                name
                sellingPlans(first: 10) {
                  edges {
                    node {
                      id
                      name
                    }
                  }
                }
              }
            }
          }
          options {
            name
            values
          }
        }
      }
    }
  }
`;

// Cart mutations
export const CART_QUERY = `
  query cart($id: ID!) {
    cart(id: $id) { 
      id 
      totalQuantity
      checkoutUrl
      lines(first: 100) {
        edges {
          node {
            id
            quantity
            merchandise {
              ... on ProductVariant {
                id
                title
                price {
                  amount
                  currencyCode
                }
              }
            }
          }
        }
      }
    }
  }
`;

export const CART_CREATE_MUTATION = `
  mutation cartCreate($input: CartInput!) {
    cartCreate(input: $input) {
      cart {
        id
        checkoutUrl
        lines(first: 100) { edges { node { id merchandise { ... on ProductVariant { id } } } } }
      }
      userErrors { field message }
    }
  }
`;

export const CART_LINES_ADD_MUTATION = `
  mutation cartLinesAdd($cartId: ID!, $lines: [CartLineInput!]!) {
    cartLinesAdd(cartId: $cartId, lines: $lines) {
      cart {
        id
        lines(first: 100) { edges { node { id merchandise { ... on ProductVariant { id } } } } }
      }
      userErrors { field message }
    }
  }
`;

export const CART_LINES_UPDATE_MUTATION = `
  mutation cartLinesUpdate($cartId: ID!, $lines: [CartLineUpdateInput!]!) {
    cartLinesUpdate(cartId: $cartId, lines: $lines) {
      cart { id }
      userErrors { field message }
    }
  }
`;

export const CART_LINES_REMOVE_MUTATION = `
  mutation cartLinesRemove($cartId: ID!, $lineIds: [ID!]!) {
    cartLinesRemove(cartId: $cartId, lineIds: $lineIds) {
      cart { id }
      userErrors { field message }
    }
  }
`;

export function formatCheckoutUrl(checkoutUrl: string): string {
  try {
    const url = new URL(checkoutUrl);
    url.searchParams.set('channel', 'online_store');
    return url.toString();
  } catch {
    return checkoutUrl;
  }
}

export function isCartNotFoundError(userErrors: Array<{ field: string[] | null; message: string }>): boolean {
  return userErrors.some(e => 
    e.message.toLowerCase().includes('cart not found') || 
    e.message.toLowerCase().includes('does not exist')
  );
}