/**
 * Sync Laravel $fillable + $timestamps from CodeIgniter *Model.php (sibling app_codeigniter).
 * Run: node tools/sync_fillable_from_codeigniter.mjs
 */
import { readdir, readFile, writeFile } from "node:fs/promises";
import { join, dirname } from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const laravelRoot = join(__dirname, "..");
const workspaceRoot = join(laravelRoot, "..");
const ciModelsDir = join(workspaceRoot, "app_codeigniter", "app", "Models");
const laravelModelsDir = join(laravelRoot, "app", "Models");

const manualCiToLaravel = new Map([
  ["SettingsModel.php", "Setting.php"],
]);

/** CI models that must not sync (legacy duplicate of another model). */
const skipCiBasenames = new Set([
  "FlagModel.php", // table `flag`; Laravel uses CurrentFlagModel → current_flag
]);

const skipLaravel = new Set([
  "Teacher.php",
  "Communication.php",
  "EventCharge.php",
  "ClassModel.php",
  "Calendar.php",
]);

function ciFileToLaravel(ciBasename) {
  if (manualCiToLaravel.has(ciBasename)) return manualCiToLaravel.get(ciBasename);
  const m = ciBasename.match(/^(.+)Model\.php$/);
  if (!m) return null;
  const base = m[1];
  if (base === "Parent" || base === "Class") return `${base}Model.php`;
  return `${base}.php`;
}

/** Find array after `protected $allowedFields =` (flexible spacing). */
function extractAllowedFieldsArrayLiteral(src) {
  const m = src.match(/protected\s+\$allowedFields\s*=\s*/);
  if (!m || m.index === undefined) return null;
  let pos = m.index + m[0].length;
  while (pos < src.length && /\s/.test(src[pos])) pos++;
  if (pos >= src.length || src[pos] !== "[") return null;
  const start = pos;
  let depth = 0;
  for (let i = pos; i < src.length; i++) {
    const c = src[i];
    if (c === "[") depth++;
    else if (c === "]") {
      depth--;
      if (depth === 0) return src.slice(start, i + 1);
    }
  }
  return null;
}

function parseQuotedStrings(arrayLiteral) {
  const out = [];
  const re = /'((?:\\'|[^'])*)'/g;
  let m;
  while ((m = re.exec(arrayLiteral))) out.push(m[1].replace(/\\'/g, "'"));
  return out;
}

function renderFillable(items) {
  const lines = items.map((it) => {
    const escaped = String(it).replace(/\\/g, "\\\\").replace(/'/g, "\\'");
    return `        '${escaped}',`;
  });
  return `[\n${lines.join("\n")}\n    ]`;
}

function replaceFillable(lv, inner) {
  const re = /protected\s+\$fillable\s*=\s*\[[\s\S]*?\];/m;
  if (!re.test(lv)) return null;
  return lv.replace(re, `protected $fillable = ${inner};`);
}

function replaceTimestamps(lv, useTs) {
  const line = useTs ? "    public $timestamps = true;" : "    public $timestamps = false;";
  // Normalize any leading whitespace so re-sync does not duplicate lines or pile up indent.
  if (/^\s*public\s+\$timestamps\s*=\s*(true|false)\s*;/m.test(lv))
    return lv.replace(/^\s*public\s+\$timestamps\s*=\s*(true|false)\s*;/m, line);
  return lv.replace(/(class\s+\w+[^\n]*\n\{)/, `$1\n${line}\n`);
}

let updated = 0,
  skipped = 0;
const missing = [];

const files = await readdir(ciModelsDir).catch(() => []);
for (const ciBasename of files) {
  if (!ciBasename.endsWith("Model.php")) continue;
  if (skipCiBasenames.has(ciBasename)) {
    console.error(`Skip CI (legacy): ${ciBasename}`);
    skipped++;
    continue;
  }
  const laravelBasename = ciFileToLaravel(ciBasename);
  if (!laravelBasename) continue;
  if (skipLaravel.has(laravelBasename)) {
    console.error(`Skip (alias/base): ${laravelBasename}`);
    skipped++;
    continue;
  }

  const lvPath = join(laravelModelsDir, laravelBasename);
  try {
    await readFile(lvPath, "utf8");
  } catch {
    missing.push(`${laravelBasename} (from ${ciBasename})`);
    continue;
  }

  const ciSrc = await readFile(join(ciModelsDir, ciBasename), "utf8");
  let lvSrc = await readFile(lvPath, "utf8");

  let useTs = true;
  const tm = ciSrc.match(/protected\s+\$useTimestamps\s*=\s*(true|false)\s*;/);
  if (tm) useTs = tm[1] === "true";

  const allowedBody = extractAllowedFieldsArrayLiteral(ciSrc);
  if (!allowedBody) {
    console.error(`No allowedFields in ${ciBasename}`);
    skipped++;
    continue;
  }

  const fields = parseQuotedStrings(allowedBody);
  if (!fields.length) {
    console.error(`Empty allowedFields in ${ciBasename}`);
    skipped++;
    continue;
  }

  if (!/protected\s+\$fillable\s*=\s*\[/.test(lvSrc)) {
    console.error(`No $fillable in ${laravelBasename}`);
    skipped++;
    continue;
  }

  const rendered = renderFillable(fields);
  let next = replaceFillable(lvSrc, rendered);
  if (next == null) {
    skipped++;
    continue;
  }
  next = replaceTimestamps(next, useTs);

  if (next === lvSrc) {
    console.error(`Unchanged: ${laravelBasename}`);
    skipped++;
    continue;
  }

  await writeFile(lvPath, next, "utf8");
  console.log(`Updated ${laravelBasename}`);
  updated++;
}

console.log(`\nDone. Updated: ${updated}, skipped: ${skipped}`);
if (missing.length) {
  console.error(`Missing (${missing.length}): ${missing.slice(0, 25).join(", ")}${missing.length > 25 ? "…" : ""}`);
  process.exitCode = 2;
}