import { mkdir, readFile, readdir, writeFile } from "node:fs/promises";
import path from "node:path";

// @ts-expect-error Node 24 executes erasable TypeScript for this build-time gate.
import { REQUIRED_COMPONENT_TOKENS, REQUIRED_PRIMITIVE_TOKENS, REQUIRED_SEMANTIC_TOKENS } from "../src/presentation/design-system/tokens/token-contract.ts";

const fixtureMode = process.argv.includes("--fixture");
const failures = [];
const tokenFiles = {
  primitive: "src/presentation/design-system/tokens/primitive.css",
  semantic: "src/presentation/design-system/tokens/semantic.css",
  component: "src/presentation/design-system/tokens/component.css",
};
/** @type {Array<readonly [string, string, readonly string[]]>} */
const tokenLayers = [
  ["primitive", tokenFiles.primitive, REQUIRED_PRIMITIVE_TOKENS],
  ["semantic", tokenFiles.semantic, REQUIRED_SEMANTIC_TOKENS],
  ["component", tokenFiles.component, REQUIRED_COMPONENT_TOKENS],
];

for (const [layer, file, tokens] of tokenLayers) {
  const source = await readFile(file, "utf8");
  for (const token of tokens) {
    if (!source.includes(`${token}:`)) {
      failures.push(`${layer} token is missing: ${token}`);
    }
  }
}

const cssSources = await Promise.all(
  [...Object.values(tokenFiles), "src/presentation/styles/theme.css"].map(
    async (file) => ({ file, source: await readFile(file, "utf8") }),
  ),
);
const definitions = new Set(
  cssSources.flatMap(({ source }) =>
    [...source.matchAll(/(--[a-z0-9-]+)\s*:/g)].map((match) => match[1]),
  ),
);
for (const { file, source } of cssSources) {
  for (const match of source.matchAll(/var\((--[a-z0-9-]+)/g)) {
    if (!definitions.has(match[1])) {
      failures.push(`${file} uses undefined token ${match[1]}`);
    }
  }
}

const semanticSource = await readFile(tokenFiles.semantic, "utf8");
const darkSource =
  semanticSource.match(/:root\[data-theme="dark"\]\s*\{([\s\S]*?)\n\}/)?.[1] ??
  "";
for (const token of [
  "--color-surface",
  "--color-surface-muted",
  "--color-surface-elevated",
  "--color-content",
  "--color-content-muted",
  "--color-content-inverse",
  "--color-border",
  "--color-border-strong",
  "--color-action",
  "--color-action-hover",
  "--color-action-pressed",
  "--color-danger",
  "--color-focus",
  "--color-disabled-content",
  "--color-disabled-surface",
]) {
  if (!darkSource.includes(`${token}:`)) {
    failures.push(`dark theme token is missing: ${token}`);
  }
}
const componentSource = await readFile(tokenFiles.component, "utf8");
if (!componentSource.includes("@media (forced-colors: active)")) {
  failures.push("forced-colors token fallback is missing");
}

/** @param {string} directory @returns {Promise<string[]>} */
async function listSourceFiles(directory) {
  const result = [];
  for (const entry of await readdir(directory, { withFileTypes: true })) {
    const target = path.join(directory, entry.name);
    if (entry.isDirectory()) result.push(...(await listSourceFiles(target)));
    else if (/\.(js|jsx|mjs|ts|tsx|mts)$/.test(entry.name)) result.push(target);
  }
  return result;
}

const sources = fixtureMode
  ? await listSourceFiles("tests/fixtures/design-system/forbidden")
  : await listSourceFiles("src");
for (const file of sources) {
  const source = await readFile(file, "utf8");
  const vendorFacade =
    file === "src/presentation/design-system/icons/vendors/lucide.tsx";
  if (!vendorFacade && /from\s+["']lucide-react["']/.test(source)) {
    failures.push(`direct icon vendor import in ${file}`);
  }
  if (
    /from\s+["'](?:react-aria-components|@radix-ui\/[^"']+)["']/.test(source)
  ) {
    failures.push(`direct headless vendor import in ${file}`);
  }
  if (
    !file.includes("src/presentation/design-system/") &&
    /presentation\/design-system\/(?!index(?:\.js)?["'])/.test(source)
  ) {
    failures.push(`design-system deep import in ${file}`);
  }
  if (
    !file.includes("src/presentation/design-system/tokens/") &&
    /(?:#[0-9a-f]{3,8}\b|oklch\(|rgba?\()/i.test(source)
  ) {
    failures.push(`raw palette value in ${file}`);
  }
  if (
    file.includes("tests/fixtures/design-system/forbidden") &&
    source.includes("TOOLTIP_ONLY_REQUIRED_INFORMATION")
  ) {
    failures.push(`tooltip-only required information in ${file}`);
  }
}

const report = {
  schemaVersion: 1,
  mode: fixtureMode ? "negative-fixture" : "source",
  checkedTokenCount:
    REQUIRED_PRIMITIVE_TOKENS.length +
    REQUIRED_SEMANTIC_TOKENS.length +
    REQUIRED_COMPONENT_TOKENS.length,
  failures,
  passed: failures.length === 0,
};
await mkdir("artifacts/quality", { recursive: true });
await writeFile(
  fixtureMode
    ? "artifacts/quality/design-system-fixture.json"
    : "artifacts/quality/design-system.json",
  `${JSON.stringify(report, null, 2)}\n`,
);

if (failures.length > 0) {
  process.stderr.write(`Design system contract failed:\n${failures.join("\n")}\n`);
  process.exit(1);
}
process.stdout.write(
  `Design system contract: ${report.checkedTokenCount} tokens and vendor boundaries PASS\n`,
);