import assert from "node:assert/strict";
import { readdirSync, readFileSync, statSync } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import test from "node:test";

const frontendRoot = fileURLToPath(new URL("../", import.meta.url));
const roots = ["src/app/api", "src/lib"];
// Empty on purpose. A call site that cannot send skip must be listed here with a reason.
const allowlist: string[] = [];

function walk(dir: string): string[] {
  const found: string[] = [];
  for (const name of readdirSync(dir)) {
    const full = path.join(dir, name);
    if (statSync(full).isDirectory()) found.push(...walk(full));
    else if (name.endsWith(".ts") || name.endsWith(".tsx")) found.push(full);
  }
  return found;
}

test("python /api/chart bodies from app/api and lib send skip", () => {
  const failures: string[] = [];
  for (const root of roots) {
    for (const file of walk(path.join(frontendRoot, root))) {
      const rel = path.relative(frontendRoot, file).replaceAll("\\", "/");
      if (allowlist.includes(rel)) continue;
      const text = readFileSync(file, "utf8");
      const re = /["']\/api\/chart["']/g;
      let match: RegExpExecArray | null;
      while ((match = re.exec(text))) {
        const idx = match.index;
        const before = text.slice(Math.max(0, idx - 120), idx);
        if (!/postPython\s*\(|callEngine\s*\(|fetchEngine\s*\(|fetch\s*\(/.test(before)) continue;
        const window = text.slice(Math.max(0, idx - 40), idx + 420);
        const sendsSkip = window.includes("skip_vedastro_main_entry_overview: true")
          || window.includes("transitChartBody(")
          || (/["']\/api\/chart["']\s*,\s*payload/.test(window) && text.includes("skip_vedastro_main_entry_overview: true"));
        if (!sendsSkip) failures.push(`${rel}:${text.slice(0, idx).split("\n").length}`);
      }
    }
  }
  assert.deepEqual(failures, []);
});