/**
 * Clean up overrides.css:
 *   1. Remove BOM character
 *   2. Remove `html body #root ` specificity prefix from selectors
 *   3. Remove `html body ` specificity prefix
 *   4. Deduplicate doubled class selectors: .foo.foo → .foo
 *   5. Deduplicate doubled attribute selectors: [attr="val"][attr="val"] → [attr="val"]
 *   6. Remove all `!important` declarations
 *   7. Compress multiple consecutive blank lines
 */

import { readFileSync, writeFileSync } from "node:fs";

const filePath = process.argv[2];
if (!filePath) {
  console.error("Usage: node cleanup-css-overrides.mjs <file.css>");
  process.exit(1);
}

let content = readFileSync(filePath, "utf-8");

// 0. Strip BOM
content = content.replace(/^\uFEFF/, "");

// 1. Remove `html body #root ` prefix (with space before the next selector)
content = content.replace(/^(\s*)html\s+body\s+#root\s+/gm, "$1");

// 2. Remove `html body ` prefix (remaining ones without #root)
content = content.replace(/^(\s*)html\s+body\s+/gm, "$1");

// 3. Deduplicate doubled class selectors: .foo.foo → .foo
//    Must not match across word boundaries incorrectly
content = content.replace(/\.([\w-]+)(\.\1)\b/g, ".$1");

// 4. Deduplicate doubled attribute selectors: [data-tool="clone"][data-tool="clone"] → [data-tool="clone"]
//    Use known patterns
const attrDedup = [
  [/\[data-tool="clone"\]\[data-tool="clone"\]/g, '[data-tool="clone"]'],
  [/\[data-tool="kit"\]\[data-tool="kit"\]/g, '[data-tool="kit"]'],
  [/\[data-tool="video"\]\[data-tool="video"\]/g, '[data-tool="video"]'],
];
for (const [pat, repl] of attrDedup) {
  content = content.replace(pat, repl);
}

// 4b. Generic dedup for any other doubled attribute patterns that slipped through
//     Match [name] or [name="val"] followed by an exact copy
content = content.replace(/\[(\w[\w-]*(?:="[^"]*")?)\]\1/g, "[$1]");

// 5. Remove ` !important` — strip the space and the keyword, keeping the semicolon or newline
content = content.replace(/\s*!important/g, "");

// 6. Fix artifacts:
//    - " ; " or " ;; " → "; "
content = content.replace(/;\s*;/g, ";");
//    - Lone semicolon before closing brace: ";\n}" → "\n}" (just remove trailing ;)
content = content.replace(/;(\s*\})/g, "$1");
//    - But keep "; " inside rule blocks — only clean up empty declarations

// 7. Don't collapse " ;}" — we already handled this above
//    If after removing !important we have style: value; } → keep it as is

// 8. Compress multiple blank lines (>2 consecutive newlines) to at most one
content = content.replace(/\n{3,}/g, "\n\n");

// 9. Remove trailing whitespace on lines
content = content.replace(/[ \t]+$/gm, "");

// 10. Ensure single trailing newline
content = content.trimEnd() + "\n";

writeFileSync(filePath, content, "utf-8");

// Stats
const importantCount = (content.match(/!important/g) || []).length;
const lines = content.split("\n").length;
console.log(`Processed: ${filePath}`);
console.log(`  Lines: ${lines}`);
console.log(`  !important remaining: ${importantCount}`);