#!/usr/bin/env node

import { readFile } from "node:fs/promises";
import path from "node:path";
import process from "node:process";
import { fileURLToPath } from "node:url";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const projectRoot = path.resolve(__dirname, "..");
const cssFiles = ["app/globals.css", "styles/globals.css"];

const hardcodedColorPattern = /#[\da-fA-F]{3,8}\b|rgba?\(|hsla?\(/;
const varFallbackPattern = /var\([^),]+,\s*[^)]+\)/;

function removeInlineComment(line) {
  const start = line.indexOf("/*");
  if (start < 0) {
    return line;
  }
  return line.slice(0, start);
}

async function checkCssFile(relativePath) {
  const absolutePath = path.join(projectRoot, relativePath);
  const file = await readFile(absolutePath, "utf8");
  const lines = file.split(/\r?\n/);
  const issues = [];

  for (let index = 0; index < lines.length; index += 1) {
    const lineNumber = index + 1;
    const line = removeInlineComment(lines[index]).trim();
    if (!line || line.startsWith("@")) {
      continue;
    }
    if (!line.includes(":")) {
      continue;
    }
    const [property, ...valueParts] = line.split(":");
    const propertyName = property.trim();
    const value = valueParts.join(":").trim();
    if (!propertyName || propertyName.startsWith("--")) {
      continue;
    }
    if (varFallbackPattern.test(value)) {
      issues.push(`${relativePath}:${lineNumber} forbidden CSS fallback: ${value}`);
      continue;
    }
    if (hardcodedColorPattern.test(value)) {
      issues.push(`${relativePath}:${lineNumber} hardcoded color literal/function: ${value}`);
    }
  }

  return issues;
}

async function main() {
  const issues = [];
  for (const cssFile of cssFiles) {
    issues.push(...(await checkCssFile(cssFile)));
  }

  if (issues.length > 0) {
    console.error("[check-global-theme-tokens] failed:");
    for (const issue of issues) {
      console.error(`- ${issue}`);
    }
    process.exit(1);
  }

  console.log("[check-global-theme-tokens] OK");
}

main().catch((error) => {
  console.error(`[check-global-theme-tokens] ${String(error)}`);
  process.exit(1);
});