import { execFileSync, execSync } from "node:child_process";
import { randomUUID } from "node:crypto";
import { readFile, readdir } from "node:fs/promises";
import path from "node:path";

const projectId = "mmday-panit";
const storageBucket = "mmday-panit.firebasestorage.app";
const sourceRoot = process.env.REWARD_ASSET_DIR;

if (!sourceRoot) {
  throw new Error("REWARD_ASSET_DIR is required");
}

const accessToken = (process.platform === "win32" ?
  execSync("gcloud auth print-access-token", {
    encoding: "utf8",
    windowsHide: true,
  }) :
  execFileSync("gcloud", ["auth", "print-access-token"], {
    encoding: "utf8",
    windowsHide: true,
  })).trim();

const collator = new Intl.Collator("ko", { numeric: true });
const firestoreBase =
  `https://firestore.googleapis.com/v1/projects/${projectId}/databases/(default)/documents`;

interface ProductAssetSpec {
  id: string;
  name: string;
  pointPrice: number;
  displayOrder: number;
  folder?: string;
  singleMain?: string;
}

const products: ProductAssetSpec[] = [
  {
    id: "acrylic-keyring",
    name: "아크릴 키링",
    pointPrice: 3000,
    displayOrder: 1,
    folder: "아크릴키링 상세페이지",
  },
  {
    id: "magsafe-tok",
    name: "맥세이프 톡",
    pointPrice: 6500,
    displayOrder: 2,
    folder: "맥세이프톡 상세페이지",
  },
  {
    id: "keyring-doll",
    name: "키링 인형",
    pointPrice: 11000,
    displayOrder: 3,
  },
  {
    id: "crossbag",
    name: "크로스백",
    pointPrice: 15000,
    displayOrder: 4,
    folder: "크로스백 상세페이지",
    singleMain: "메인.png",
  },
];

async function imageFiles(dir: string): Promise<string[]> {
  const names = await readdir(dir);
  return names
    .filter((name) => /\.(png|jpe?g|webp)$/i.test(name))
    .sort(collator.compare)
    .map((name) => path.join(dir, name));
}

function downloadUrl(objectPath: string, token: string): string {
  return `https://firebasestorage.googleapis.com/v0/b/${storageBucket}/o/${encodeURIComponent(objectPath)}?alt=media&token=${token}`;
}

async function upload(localPath: string, objectPath: string): Promise<string> {
  const token = randomUUID();
  const boundary = `mmday-${randomUUID()}`;
  const metadata = Buffer.from(JSON.stringify({
    name: objectPath,
    contentType: "image/png",
    cacheControl: "public,max-age=31536000,immutable",
    metadata: { firebaseStorageDownloadTokens: token },
  }));
  const image = await readFile(localPath);
  const body = Buffer.concat([
    Buffer.from(`--${boundary}\r\nContent-Type: application/json; charset=UTF-8\r\n\r\n`),
    metadata,
    Buffer.from(`\r\n--${boundary}\r\nContent-Type: image/png\r\n\r\n`),
    image,
    Buffer.from(`\r\n--${boundary}--\r\n`),
  ]);
  const response = await fetch(
    `https://storage.googleapis.com/upload/storage/v1/b/${encodeURIComponent(storageBucket)}/o?uploadType=multipart`,
    {
      method: "POST",
      headers: {
        authorization: `Bearer ${accessToken}`,
        "content-type": `multipart/related; boundary=${boundary}`,
      },
      body,
    }
  );
  if (!response.ok) {
    throw new Error(`Storage upload failed ${response.status}: ${await response.text()}`);
  }
  return downloadUrl(objectPath, token);
}

async function uploadLimited(
  files: string[],
  destinationPrefix: string
): Promise<string[]> {
  const output = new Array<string>(files.length);
  let cursor = 0;
  async function worker() {
    while (cursor < files.length) {
      const index = cursor++;
      const ext = path.extname(files[index]).toLowerCase();
      const destination = `${destinationPrefix}/${String(index + 1).padStart(2, "0")}${ext}`;
      output[index] = await upload(files[index], destination);
      console.log(`uploaded ${destination}`);
    }
  }
  await Promise.all(Array.from({ length: Math.min(4, files.length) }, worker));
  return output;
}

async function upsertProduct(
  spec: ProductAssetSpec,
  mainImages: string[],
  detailImages: string[]
) {
  const existingProduct = await getDocument(`products/${spec.id}`);
  const now = new Date().toISOString();
  const hasImages = mainImages.length > 0;
  await patchDocument(`products/${spec.id}`, {
    name: { stringValue: spec.name },
    pointPrice: { integerValue: String(spec.pointPrice) },
    active: { booleanValue: hasImages },
    redeemable: { booleanValue: hasImages },
    displayOrder: { integerValue: String(spec.displayOrder) },
    mainImages: stringArray(mainImages),
    detailImages: stringArray(detailImages),
    createdAt: existingProduct?.fields?.createdAt ?? { timestampValue: now },
    updatedAt: { timestampValue: now },
  });
}

type FirestoreValue = Record<string, unknown>;
interface FirestoreDocument { fields?: Record<string, FirestoreValue> }

function stringArray(values: string[]): FirestoreValue {
  return { arrayValue: { values: values.map((value) => ({ stringValue: value })) } };
}

async function getDocument(documentPath: string): Promise<FirestoreDocument | null> {
  const response = await fetch(`${firestoreBase}/${documentPath}`, {
    headers: { authorization: `Bearer ${accessToken}` },
  });
  if (response.status === 404) return null;
  if (!response.ok) {
    throw new Error(`Firestore read failed ${response.status}: ${await response.text()}`);
  }
  return await response.json() as FirestoreDocument;
}

async function patchDocument(
  documentPath: string,
  fields: Record<string, FirestoreValue>
): Promise<void> {
  const response = await fetch(`${firestoreBase}/${documentPath}`, {
    method: "PATCH",
    headers: {
      authorization: `Bearer ${accessToken}`,
      "content-type": "application/json",
    },
    body: JSON.stringify({ fields }),
  });
  if (!response.ok) {
    throw new Error(`Firestore write failed ${response.status}: ${await response.text()}`);
  }
}

async function main() {
  for (const spec of products) {
    let mainImages: string[] = [];
    let detailImages: string[] = [];
    if (spec.folder) {
      const productDir = path.join(sourceRoot, spec.folder);
      const mainFiles = spec.singleMain ?
        [path.join(productDir, spec.singleMain)] :
        await imageFiles(path.join(productDir, "메인"));
      const detailFiles = await imageFiles(path.join(productDir, "상세페이지"));
      [mainImages, detailImages] = await Promise.all([
        uploadLimited(mainFiles, `reward-products/${spec.id}/main`),
        uploadLimited(detailFiles, `reward-products/${spec.id}/detail`),
      ]);
    }
    await upsertProduct(spec, mainImages, detailImages);
    console.log(
      `saved ${spec.id}: main=${mainImages.length}, detail=${detailImages.length}`
    );
  }
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});