#!/usr/bin/env node
/** Simple import-graph cycle detection for src/modules/healthcare. */
import { readFileSync, readdirSync, statSync } from "node:fs";
import { join, relative } from "node:path";
import { fileURLToPath } from "node:url";

const ROOT = join(fileURLToPath(new URL(".", import.meta.url)), "..");
const MODULE = join(ROOT, "src", "modules", "healthcare");
const importRe = /from\s+["'](@\/[^"']+)["']/g;

const graph = new Map();

function walk(dir) {
  for (const e of readdirSync(dir)) {
    const f = join(dir, e);
    if (statSync(f).isDirectory()) walk(f);
    else if (/\.tsx?$/.test(e)) {
      const rel = relative(ROOT, f).replace(/\\/g, "/");
      const deps = [];
      const content = readFileSync(f, "utf8");
      let m;
      importRe.lastIndex = 0;
      while ((m = importRe.exec(content)) !== null) {
        if (m[1].startsWith("@/src/modules/healthcare/")) deps.push(m[1]);
      }
      graph.set(rel, deps);
    }
  }
}

walk(MODULE);

function resolve(importPath) {
  const base = importPath.replace("@/", "").replace(/\/$/, "");
  const candidates = [
    `${base}.tsx`,
    `${base}.ts`,
    `${base}/index.tsx`,
    `${base}/index.ts`,
  ];
  for (const c of candidates) {
    if (graph.has(c)) return c;
  }
  return null;
}

function findCycles() {
  const cycles = [];
  const visited = new Set();
  const stack = new Set();

  function dfs(node, path) {
    if (stack.has(node)) {
      cycles.push([...path, node]);
      return;
    }
    if (visited.has(node)) return;
    visited.add(node);
    stack.add(node);
    for (const dep of graph.get(node) ?? []) {
      const resolved = resolve(dep);
      if (resolved) dfs(resolved, [...path, node]);
    }
    stack.delete(node);
  }

  for (const node of graph.keys()) dfs(node, []);
  return cycles;
}

const cycles = findCycles();
console.log("Circular Dependency Check (healthcare module)\n");
if (cycles.length) {
  console.error("❌ Cycles found:");
  for (const c of cycles) console.error("  ", c.join(" → "));
  process.exit(1);
}
console.log(`✅ No cycles in ${graph.size} healthcare module files`);
process.exit(0);