import { access, readFile, readdir } from "node:fs/promises";
import { join } from "node:path";

const root = process.cwd();
const generatedPath = join(root, "dist", "theme-github-dev.css");
const generatedDarkPath = join(root, "dist", "theme-github-dev-dark.css");
const themeSourceDir = join(root, "themes", "github-light");
const darkThemeSourceDir = join(root, "themes", "github-dark");
const tokenSourceDir = join(root, "styles", "tokens");
const packageJson = JSON.parse(await readFile(join(root, "package.json"), "utf8")) as { version?: string };
const generated = await readFile(generatedPath, "utf8");
const generatedDark = await readFile(generatedDarkPath, "utf8");

const requiredSnippets = [
  "--theme-display-name: GitHub Light",
  '--theme-version: "1.26.1',
  "--color-primary: #0969da",
  "--github-bgColor-accent-emphasis: #0969da",
  "--color-syntax-keyword: #cf222e",
  "--color-syntax-string: #0a3069",
  ".ui.primary.button",
  ".repository.file.list #repo-files-table",
  ".page-content.user.signin",
  ".gitea-github-theme-templates",
];

const requiredDarkSnippets = [
  '--theme-display-name: "GitHub Dark"',
  '--theme-color-scheme: "dark"',
  "--is-dark-theme: true",
  "--color-body: #0d1117",
  "--color-text: #e6edf3",
  "--color-diff-added-row-bg: #033a16",
  "--color-diff-removed-row-bg: #490202",
  "--github-bgColor-accent-emphasis: #1f6feb",
  "--color-syntax-keyword: #ff7b72",
  "--color-syntax-string: #a5d6ff",
  ".ui.primary.button",
];

if (packageJson.version !== "1.26.1") {
  throw new Error(`project version must be 1.26.1, got ${packageJson.version}`);
}

await access(join(root, "themes", "index.ts"));
await access(join(themeSourceDir, "index.ts"));
await access(join(darkThemeSourceDir, "index.ts"));

const tokenFiles = await readdir(tokenSourceDir);
const themeFiles = await readdir(themeSourceDir);
const darkThemeFiles = await readdir(darkThemeSourceDir);
const allowedTokenFiles = new Set(["derived.ts", "index.ts", "render-theme.ts", "required.ts"]);

const unexpectedTokenFiles = tokenFiles.filter((file) => !allowedTokenFiles.has(file));

if (unexpectedTokenFiles.length > 0) {
  throw new Error(
    `styles/tokens must only contain theme rendering helpers, got: ${unexpectedTokenFiles.join(", ")}`,
  );
}

for (const file of [
  "theme-meta.ts",
  "core.ts",
  "console.ts",
  "named-colors.ts",
  "ansi-colors.ts",
  "diff-colors.ts",
  "semantic-colors.ts",
  "github-colors.ts",
  "syntax-colors.ts",
  "target-colors.ts",
]) {
  if (!themeFiles.includes(file)) {
    throw new Error(`themes/github-light is missing theme source file: ${file}`);
  }
}

for (const file of [
  "theme-meta.ts",
  "core.ts",
  "diff-colors.ts",
  "github-colors.ts",
  "syntax-colors.ts",
  "target-colors.ts",
  "index.ts",
]) {
  if (!darkThemeFiles.includes(file)) {
    throw new Error(`themes/github-dark is missing theme source file: ${file}`);
  }
}

for (const snippet of requiredSnippets) {
  if (!generated.includes(snippet)) {
    throw new Error(`generated theme is missing required snippet: ${snippet}`);
  }
}

for (const snippet of requiredDarkSnippets) {
  if (!generatedDark.includes(snippet)) {
    throw new Error(`generated dark theme is missing snippet: ${snippet}`);
  }
}

console.log("generated theme verified");