import fs from 'node:fs';
import path from 'node:path';

/**
 * GOOSED PROXY BOUNDARY (H5 Session architecture Patch 5)
 *
 * H5 chat 主链路 Portal → goosed 的唯一 adapter 是 tkmind-proxy.mjs。
 * 其它模块须通过 tkmindProxy.apiFetch / apiFetchTo 间接访问，不得自建 createApiFetch。
 *
 * 见 docs/h5-session-architecture-20260706.md §7.2
 */

/** @typedef {{ file: string, line: number, rule: string, text: string }} GoosedBoundaryViolation */

export const GOOSED_PROXY_ADAPTER_FILE = 'tkmind-proxy.mjs';

export const GOOSED_DIRECT_ALLOWLIST = [
  GOOSED_PROXY_ADAPTER_FILE,
  'mindspace-agent-runner.mjs',
  'mindspace-page-edit-session.mjs',
  'wechat-mp.mjs',
  'session-reconcile.mjs',
];

export const GOOSED_PROXY_GUARDED_FILES = [
  'server.mjs',
  'agent-run-gateway.mjs',
  'agent-run-routes.mjs',
  'direct-chat-service.mjs',
  'chat-intent-router.mjs',
];

export const GOOSED_BOUNDARY_LINE_ALLOW = [
  /tkmindProxy\./,
  /GOOSED PROXY BOUNDARY/,
  /AGENT_RUNS_REQUIRED/,
  /runHandlerChain\(tkmindProxy/,
  /handlers\['POST \/agent/,
  /api\.(post|get|put|delete|patch)\(['"]\/agent/,
  /api\.(post|get|put|delete|patch)\(['"]\/sessions/,
  /req\.path\.endsWith\(['"]\/reply['"]\)/,
  /req\.path\.endsWith\(['"]\/events['"]\)/,
  /parseApiTargets/,
  /TKMIND_API_TARGET/,
  /createTkmindProxy/,
  /API_TARGETS/,
  /proxyFallback/,
  /proxySessionEvents/,
];

export const GOOSED_BOUNDARY_FORBIDDEN = [
  { id: 'create-api-fetch', pattern: /\bcreateApiFetch\s*\(/ },
  {
    id: 'direct-sessions-reply',
    pattern: /\bapiFetch\s*\(\s*[`'"]\/sessions\/[^`'"]+\/reply/,
  },
  {
    id: 'direct-sessions-events',
    pattern: /\bapiFetch\s*\(\s*[`'"]\/sessions\/[^`'"]+\/events/,
  },
  { id: 'direct-agent-start', pattern: /\bapiFetch\s*\(\s*[`'"]\/agent\/start/ },
  { id: 'direct-agent-resume', pattern: /\bapiFetch\s*\(\s*[`'"]\/agent\/resume/ },
  {
    id: 'raw-goosed-target-fetch',
    pattern: /fetch\s*\(\s*[`'"]https?:\/\/127\.0\.0\.1:1800[67]/,
  },
];

export const GOOSED_BOUNDARY_SCAN_IGNORE = [
  /^scripts\//,
  /^mindspace-service\//,
  /^\.runtime\//,
  /^node_modules\//,
  /\.test\.mjs$/,
  /\.test\.ts$/,
];

function relativePosix(rootDir, absolutePath) {
  return path.relative(rootDir, absolutePath).split(path.sep).join('/');
}

function isIgnoredScanPath(relativePath) {
  return GOOSED_BOUNDARY_SCAN_IGNORE.some((pattern) => pattern.test(relativePath));
}

function isLineAllowed(line) {
  return GOOSED_BOUNDARY_LINE_ALLOW.some((pattern) => pattern.test(line));
}

function scanFileContent(relativePath, content, { guardedOnly = false } = {}) {
  /** @type {GoosedBoundaryViolation[]} */
  const violations = [];
  const lines = content.split('\n');
  for (let index = 0; index < lines.length; index += 1) {
    const line = lines[index];
    if (!line.trim() || line.trim().startsWith('//') || line.trim().startsWith('*')) continue;
    if (isLineAllowed(line)) continue;
    for (const rule of GOOSED_BOUNDARY_FORBIDDEN) {
      if (!rule.pattern.test(line)) continue;
      violations.push({
        file: relativePath,
        line: index + 1,
        rule: rule.id,
        text: line.trim(),
      });
    }
  }
  if (guardedOnly && violations.length === 0) return violations;
  return violations;
}

export function checkGoosedProxyBoundary(rootDir, {
  extraAllowlist = [],
  extraGuarded = [],
  scanRepo = true,
} = {}) {
  /** @type {GoosedBoundaryViolation[]} */
  const violations = [];
  const allowlist = new Set([...GOOSED_DIRECT_ALLOWLIST, ...extraAllowlist]);
  const guarded = [...GOOSED_PROXY_GUARDED_FILES, ...extraGuarded];

  for (const relativePath of guarded) {
    const absolutePath = path.join(rootDir, relativePath);
    if (!fs.existsSync(absolutePath)) {
      violations.push({
        file: relativePath,
        line: 0,
        rule: 'missing-guarded-file',
        text: 'Guarded file missing from repository',
      });
      continue;
    }
    const content = fs.readFileSync(absolutePath, 'utf8');
    violations.push(...scanFileContent(relativePath, content, { guardedOnly: true }));
  }

  if (!scanRepo) return violations;

  const queue = [rootDir];
  while (queue.length > 0) {
    const current = queue.pop();
    const entries = fs.readdirSync(current, { withFileTypes: true });
    for (const entry of entries) {
      if (entry.name === 'node_modules' || entry.name === '.git') continue;
      const absolutePath = path.join(current, entry.name);
      const relativePath = relativePosix(rootDir, absolutePath);
      if (entry.isDirectory()) {
        queue.push(absolutePath);
        continue;
      }
      if (!entry.name.endsWith('.mjs')) continue;
      if (isIgnoredScanPath(relativePath)) continue;
      if (allowlist.has(relativePath)) continue;
      if (guarded.includes(relativePath)) continue;
      const content = fs.readFileSync(absolutePath, 'utf8');
      violations.push(...scanFileContent(relativePath, content));
    }
  }

  return violations;
}

export function formatGoosedBoundaryViolations(violations) {
  if (!violations.length) return '';
  return violations
    .map((item) => `${item.file}:${item.line} [${item.rule}] ${item.text}`)
    .join('\n');
}