import { json } from "@remix-run/node";
import { useLoaderData, useFetcher } from "@remix-run/react";
import {
  Page,
  Layout,
  Card,
  TextField,
  Checkbox,
  Button,
  Thumbnail,
  Spinner,
  Toast,
  Frame,
} from "@shopify/polaris";
import { useEffect, useState } from "react";
import { TitleBar } from "@shopify/app-bridge-react";
import { getTurn14AccessTokenFromMetafield } from "../utils/turn14Token.server";
import { authenticate } from "../shopify.server";

export const loader = async ({ request }) => {
  const accessToken = await getTurn14AccessTokenFromMetafield(request);
  const { admin } = await authenticate.admin(request);

  // Get brands
  const brandRes = await fetch("https://turn14.data4autos.com/v1/brands", {
    headers: {
      Authorization: `Bearer ${accessToken}`,
      "Content-Type": "application/json",
    },
  });
  const brandJson = await brandRes.json();
  if (!brandRes.ok) {
    return json({ error: brandJson.error || "Failed to fetch brands" }, { status: 500 });
  }

  // Get collections
  const gqlRaw = await admin.graphql(`
    {
      collections(first: 100) {
        edges {
          node {
            id
            title
            handle
          }
        }
      }
    }
  `);
  const gql = await gqlRaw.json();
  const collections = gql?.data?.collections?.edges?.map((e) => e.node) || [];

  return json({
    brands: brandJson.data,
    collections,
  });
};

export const action = async ({ request }) => {
  const formData = await request.formData();
  const selectedBrands = JSON.parse(formData.get("selectedBrands") || "[]");

  const { admin } = await authenticate.admin(request);

  // Get current collections
  const gqlRaw = await admin.graphql(`
    {
      collections(first: 100) {
        edges {
          node {
            id
            title
          }
        }
      }
    }
  `);
  const gql = await gqlRaw.json();
  const existingCollections = gql?.data?.collections?.edges?.map((e) => e.node) || [];

  const selectedTitles = selectedBrands.map((b) => b.name.toLowerCase());
  const logoMap = Object.fromEntries(selectedBrands.map(b => [b.name.toLowerCase(), b.logo]));

  // Delete unselected
  for (const col of existingCollections) {
    if (!selectedTitles.includes(col.title.toLowerCase())) {
      await admin.graphql(`
      mutation {
        collectionDelete(input: { id: "${col.id}" }) {
          deletedCollectionId
          userErrors { message }
        }
      }
    `);
    }
  }


  // Create new
  for (const brand of selectedBrands) {
    const exists = existingCollections.find(
      (c) => c.title.toLowerCase() === brand.name.toLowerCase()
    );
    if (!exists) {
      const escapedName = brand.name.replace(/"/g, '\\"');
      const logo = brand.logo || "";

      await admin.graphql(`
        mutation {
          collectionCreate(input: {
            title: "${escapedName}",
            descriptionHtml: "Products from brand ${escapedName}",
            image: {
              altText: "${escapedName} Logo",
              src: "${logo}"
            }
          }) {
            collection { id }
            userErrors { message }
          }
        }
      `);
    }
  }

const shopDataRaw = await admin.graphql(`
  {
    shop {
      id
    }
  }
`);
const shopRes = await admin.graphql(`{ shop { id } }`);
const shopJson = await shopRes.json();
const shopId = shopJson?.data?.shop?.id;

await admin.graphql(`
  mutation {
    metafieldsSet(metafields: [{
      namespace: "turn14",
      key: "selected_brands",
      type: "json",
      ownerId: "${shopId}",
      value: ${JSON.stringify(JSON.stringify(selectedBrands))}
    }]) {
      metafields {
        id
      }
      userErrors {
        message
      }
    }
  }
`);



  return json({ success: true });

};

export default function BrandsPage() {
  const { brands, collections } = useLoaderData();
  const fetcher = useFetcher();
  const isSubmitting = fetcher.state === "submitting";
  const [toastActive, setToastActive] = useState(false);
  const [search, setSearch] = useState("");

  const collectionTitles = new Set(collections.map((c) => c.title.toLowerCase()));
  const defaultSelected = brands
    .filter((b) => collectionTitles.has(b.name.toLowerCase()))
    .map((b) => b.id);

  const [selectedIds, setSelectedIds] = useState(defaultSelected);
  const [filteredBrands, setFilteredBrands] = useState(brands);

  useEffect(() => {
    const term = search.toLowerCase();
    setFilteredBrands(brands.filter((b) => b.name.toLowerCase().includes(term)));
  }, [search, brands]);

  useEffect(() => {
    if (fetcher.data?.success) {
      setToastActive(true);
    }
  }, [fetcher.data]);

  const toggleSelect = (id) => {
    setSelectedIds((prev) =>
      prev.includes(id) ? prev.filter((i) => i !== id) : [...prev, id]
    );
  };

  const toastMarkup = toastActive ? (
    <Toast
      content="Collections updated successfully!"
      onDismiss={() => setToastActive(false)}
    />
  ) : null;

  const selectedBrands = brands.filter((b) => selectedIds.includes(b.id));

  return (
    <Frame>
      <Page title="Data4Autos Turn14 Brands List">
        <TitleBar title="Data4Autos Turn14 Integration" />
        <Layout>
          <Layout.Section>
            <div style={{ display: "flex", alignItems: "center", gap: "1rem", flexWrap: "wrap" }}></div>
            <TextField
              label="Search brands"
              value={search}
              onChange={setSearch}
              autoComplete="off"
              placeholder="Type brand name..."
            />
          </Layout.Section>

          <Layout.Section>
            <div
              style={{
                display: "grid",
                gridTemplateColumns: "repeat(auto-fill, minmax(220px, 1fr))",
                gap: "16px",
              }}
            >
              {filteredBrands.map((brand) => (
                <Card key={brand.id} sectioned>
                  <div style={{ display: "flex", alignItems: "center", gap: "1rem" }}>
                    <Checkbox
                      label=""
                      checked={selectedIds.includes(brand.id)}
                      onChange={() => toggleSelect(brand.id)}
                    />
                    <Thumbnail
                      source={
                        brand.logo ||
                        "https://cdn.shopify.com/s/files/1/0757/9955/files/no-image_280x@2x.png"
                      }
                      alt={brand.name}
                      size="small"
                    />
                    <div>
                      <strong>{brand.name}</strong>
                    </div>
                  </div>
                </Card>
              ))}
            </div>
          </Layout.Section>

          <Layout.Section>
            <fetcher.Form method="post">
              <input
                type="hidden"
                name="selectedBrands"
                value={JSON.stringify(selectedBrands)}
              />
              <Button
                primary
                submit
                disabled={selectedIds.length === 0 || isSubmitting}
              >
                {isSubmitting ? <Spinner size="small" /> : "Save Collections"}
              </Button>
            </fetcher.Form>
          </Layout.Section>
        </Layout>
        {toastMarkup}
      </Page>
    </Frame>
  );
}