import { execFileSync } from "node:child_process";
import { readFile } from "node:fs/promises";
import { resolve } from "node:path";
import { fileURLToPath } from "node:url";

const frontendDir = fileURLToPath(new URL("../", import.meta.url));
const rootDir = resolve(frontendDir, "..");
const packageInfo = JSON.parse(await readFile(resolve(frontendDir, "package.json"), "utf8"));
const failures = [];

const allowedChannels = new Set(["dev", "main", "release", "local"]);
const fullShaPattern = /^[0-9a-f]{40}$/i;
const semverTag = `v${packageInfo.version}`;

const env = process.env;
const channel = env.VITE_BUILD_CHANNEL || "local";
const commit = env.VITE_BUILD_COMMIT || "local";
const isCi = env.CI === "true" || env.GITHUB_ACTIONS === "true";
const isTagBuild = env.GITHUB_REF_TYPE === "tag";
const isReleaseBuild = env.RELEASE_BUILD === "true" || isTagBuild || channel === "release";
const requiresMacosSigning = env.REQUIRE_DESKTOP_SIGNING === "true";
const requiresWindowsSigning = env.REQUIRE_WINDOWS_SIGNING === "true";

const fail = (message) => failures.push(message);
const assert = (condition, message) => {
  if (!condition) fail(message);
};

const requireEnv = (name) => {
  assert(Boolean(env[name]), `${name} must be configured for signed desktop release builds.`);
};

const gitHead = () => {
  try {
    return execFileSync("git", ["rev-parse", "HEAD"], {
      cwd: rootDir,
      encoding: "utf8",
      stdio: ["ignore", "pipe", "ignore"],
    }).trim();
  } catch {
    return undefined;
  }
};

assert(allowedChannels.has(channel), `VITE_BUILD_CHANNEL must be one of ${[...allowedChannels].join(", ")}.`);

if (isCi || isReleaseBuild) {
  assert(channel !== "local", "CI and release builds must inject VITE_BUILD_CHANNEL.");
  assert(fullShaPattern.test(commit), "CI and release builds must inject a full 40-character VITE_BUILD_COMMIT.");
}

if (env.GITHUB_SHA) {
  assert(
    commit === env.GITHUB_SHA || commit === "local",
    "VITE_BUILD_COMMIT must match GITHUB_SHA when GitHub Actions provides a source commit.",
  );
}

if (isReleaseBuild && fullShaPattern.test(commit)) {
  const headSha = gitHead();
  assert(Boolean(headSha), "Release builds must be able to resolve the current Git commit.");
  if (headSha) {
    assert(commit === headSha, "VITE_BUILD_COMMIT must match the current Git HEAD for release builds.");
  }
}

if (isTagBuild) {
  assert(env.GITHUB_REF_NAME === semverTag, `Release tag must be ${semverTag}; found ${env.GITHUB_REF_NAME || "<missing>"}.`);
  assert(channel === "release", "Release tag builds must set VITE_BUILD_CHANNEL=release.");
}

assert(
  !(requiresMacosSigning && requiresWindowsSigning),
  "macOS and Windows signing requirements must be checked in their native jobs.",
);

if (requiresMacosSigning) {
  assert(process.platform === "darwin", "Signed macOS desktop release builds must run on macOS.");
  if (isCi) {
    assert(isTagBuild, "Signed desktop release candidate builds in CI must run from a release tag.");
  }
  requireEnv("TAURI_SIGNING_PRIVATE_KEY");
  requireEnv("TAURI_SIGNING_PRIVATE_KEY_PASSWORD");
  requireEnv("APPLE_ID");
  requireEnv("APPLE_PASSWORD");
  requireEnv("APPLE_TEAM_ID");
  assert(
    Boolean(env.APPLE_CERTIFICATE || env.APPLE_SIGNING_IDENTITY),
    "APPLE_CERTIFICATE or APPLE_SIGNING_IDENTITY must be configured for macOS signing.",
  );
  if (env.APPLE_CERTIFICATE) {
    requireEnv("APPLE_CERTIFICATE_PASSWORD");
  }
}

if (requiresWindowsSigning) {
  assert(process.platform === "win32", "Signed Windows desktop release builds must run on Windows.");
  if (isCi) {
    assert(isTagBuild, "Signed Windows desktop release candidate builds in CI must run from a release tag.");
  }
  requireEnv("TAURI_SIGNING_PRIVATE_KEY");
  requireEnv("TAURI_SIGNING_PRIVATE_KEY_PASSWORD");
  requireEnv("WINDOWS_CERTIFICATE");
  requireEnv("WINDOWS_CERTIFICATE_PASSWORD");
  requireEnv("WINDOWS_TIMESTAMP_URL");
}

if (failures.length > 0) {
  console.error(`Release build environment check failed:\n${failures.map((item) => `  - ${item}`).join("\n")}`);
  process.exitCode = 1;
} else {
  console.log("Release build environment check passed.");
}