import { createHash } from "node:crypto";
import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
import { basename, extname, join, relative } from "node:path";
import { argv, exit } from "node:process";

const strict = argv.includes("--strict");
const failures = [];
const warnings = [];
const root = process.cwd();
// App Store Connect uses the bare `da` locale code for Danish (not `da-DK`).
// Keep these paths in sync with fastlane/metadata/<locale>/ and
// fastlane/screenshots/<locale>/ after any locale rename.
const metadataRoot = join(root, "fastlane/metadata/da");
const screenshotRoot = join(root, "fastlane/screenshots/da");

const fail = (message) => failures.push(message);
const warn = (message) => warnings.push(message);
const readText = (path) => {
  if (!existsSync(path)) {
    fail(`Missing ${relative(root, path)}`);
    return "";
  }
  const value = readFileSync(path, "utf8").trim();
  if (!value) fail(`${relative(root, path)} must not be empty`);
  return value;
};

let release;
try {
  release = JSON.parse(readFileSync(join(root, "ios/release.json"), "utf8"));
} catch {
  fail("ios/release.json must be valid JSON");
  release = {};
}
if (!/^\d+\.\d+\.\d+$/.test(release.marketingVersion ?? "")) {
  fail("ios/release.json marketingVersion must be numeric SemVer (X.Y.Z)");
}
if (release.bundleId !== "io.truckwash.app") fail("ios/release.json bundleId must be io.truckwash.app");
if (release.minimumIosVersion !== "15.0")
  fail("ios/release.json minimumIosVersion must remain 15.0 unless compatibility is intentionally changed");

const name = readText(join(metadataRoot, "name.txt"));
const subtitle = readText(join(metadataRoot, "subtitle.txt"));
const promotionalText = readText(join(metadataRoot, "promotional_text.txt"));
const keywords = readText(join(metadataRoot, "keywords.txt"));
const description = readText(join(metadataRoot, "description.txt"));
readText(join(metadataRoot, "release_notes.txt"));
readText(join(root, "fastlane/metadata/copyright.txt"));

if ([...name].length > 30) fail("App Store name exceeds 30 characters");
if ([...subtitle].length > 30) fail("App Store subtitle exceeds 30 characters");
if ([...promotionalText].length > 170) fail("Promotional text exceeds 170 characters");
if (Buffer.byteLength(keywords, "utf8") > 100) fail("Keywords exceed Apple's 100-byte limit");
if ([...description].length > 4000) fail("Description exceeds 4,000 characters");

for (const file of ["support_url.txt", "privacy_url.txt", "marketing_url.txt"]) {
  const value = readText(join(metadataRoot, file));
  try {
    const url = new URL(value);
    if (url.protocol !== "https:") fail(`${file} must use HTTPS`);
  } catch {
    fail(`${file} must contain a valid URL`);
  }
}

const knownCapacitorArtwork = new Set([
  "29e4777e319de3ee5a52c3a8004ec19d0568414004257e36d7c94a077d71c93b",
  "1b5002b74a5500e697298ced06ca2811ac33f2771f236f3c720ff23243890530",
]);
for (const path of [
  join(root, "ios/App/App/Assets.xcassets/AppIcon.appiconset/AppIcon-512@2x.png"),
  join(root, "ios/App/App/Assets.xcassets/Splash.imageset/splash-2732x2732.png"),
]) {
  if (!existsSync(path)) {
    fail(`Missing ${relative(root, path)}`);
    continue;
  }
  const digest = createHash("sha256").update(readFileSync(path)).digest("hex");
  if (knownCapacitorArtwork.has(digest)) {
    fail(`${relative(root, path)} is still the default Capacitor artwork`);
  }
}

const pngInfo = (buffer) => {
  if (buffer.length < 33 || buffer.subarray(1, 4).toString("ascii") !== "PNG") return null;
  const colorType = buffer[25];
  return {
    width: buffer.readUInt32BE(16),
    height: buffer.readUInt32BE(20),
    hasAlpha: colorType === 4 || colorType === 6,
  };
};

const jpegInfo = (buffer) => {
  if (buffer.length < 4 || buffer[0] !== 0xff || buffer[1] !== 0xd8) return null;
  let offset = 2;
  while (offset + 9 < buffer.length) {
    if (buffer[offset] !== 0xff) {
      offset += 1;
      continue;
    }
    const marker = buffer[offset + 1];
    if (marker === 0xd8 || marker === 0xd9) {
      offset += 2;
      continue;
    }
    const length = buffer.readUInt16BE(offset + 2);
    if (length < 2 || offset + 2 + length > buffer.length) break;
    if ([0xc0, 0xc1, 0xc2, 0xc3, 0xc5, 0xc6, 0xc7, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf].includes(marker)) {
      return { width: buffer.readUInt16BE(offset + 7), height: buffer.readUInt16BE(offset + 5), hasAlpha: false };
    }
    offset += 2 + length;
  }
  return null;
};

const screenshots = existsSync(screenshotRoot)
  ? readdirSync(screenshotRoot)
      .filter((file) => [".png", ".jpg", ".jpeg"].includes(extname(file).toLowerCase()))
      .map((file) => join(screenshotRoot, file))
  : [];
const groups = { iphone: [], ipad: [] };
const hashes = new Map();
for (const path of screenshots) {
  const filename = basename(path);
  const group = filename.startsWith("iphone-6.9-") ? "iphone" : filename.startsWith("ipad-13-") ? "ipad" : null;
  if (!group) {
    fail(`${filename} must start with iphone-6.9- or ipad-13-`);
    continue;
  }
  if (statSync(path).size === 0) {
    fail(`${filename} is empty`);
    continue;
  }
  const buffer = readFileSync(path);
  const info = pngInfo(buffer) ?? jpegInfo(buffer);
  if (!info) {
    fail(`${filename} is not a readable PNG or JPEG`);
    continue;
  }
  const expected = group === "iphone" ? [1320, 2868] : [2064, 2752];
  if (info.width !== expected[0] || info.height !== expected[1]) {
    fail(`${filename} is ${info.width}x${info.height}; expected ${expected[0]}x${expected[1]}`);
  }
  if (info.hasAlpha) fail(`${filename} has an alpha channel, which App Store screenshots must not use`);
  const digest = createHash("sha256").update(buffer).digest("hex");
  if (hashes.has(digest)) fail(`${filename} duplicates ${hashes.get(digest)}`);
  hashes.set(digest, filename);
  groups[group].push(filename);
}

for (const [group, files] of Object.entries(groups)) {
  if (files.length !== 6) {
    const message = `Expected 6 ${group === "iphone" ? "iPhone 6.9-inch" : "iPad 13-inch"} screenshots; found ${
      files.length
    }`;
    if (strict) fail(message);
    else warn(message);
  }
}

for (const message of warnings) console.warn(`Storefront readiness warning: ${message}`);
if (failures.length > 0) {
  console.error("App Store validation failed:");
  for (const message of failures) console.error(`- ${message}`);
  exit(1);
}
console.log(`App Store metadata is valid${strict ? " and candidate assets are complete" : ""}.`);