import crypto from 'node:crypto';
import fs from 'node:fs/promises';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { USER_COOKIE } from '../user-auth.mjs';
import { PUBLISH_ROOT_DIR } from '../user-publish.mjs';

const repoRoot = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');

export function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

export function createReporter() {
  const checks = [];
  const issues = [];

  return {
    checks,
    issues,
    pass(label, detail = '') {
      checks.push({ ok: true, label, detail });
      console.log(`✔ ${label}${detail ? `: ${detail}` : ''}`);
    },
    fail(label, detail = '') {
      issues.push({ label, detail });
      checks.push({ ok: false, label, detail });
      console.error(`✘ ${label}${detail ? `: ${detail}` : ''}`);
    },
    summary() {
      console.log('\n=== 汇总 ===');
      console.log(`通过: ${checks.filter((item) => item.ok).length}/${checks.length}`);
      if (issues.length) {
        console.log('失败项:');
        for (const item of issues) {
          console.log(`  - ${item.label}: ${item.detail}`);
        }
        return 1;
      }
      console.log('场景测试全部通过');
      return 0;
    },
  };
}

export function resolvePortalBase(port) {
  return `http://127.0.0.1:${port}`;
}

export async function loginViaApi(baseUrl, { username, password }, reporter) {
  const response = await fetch(`${baseUrl}/auth/login`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username, password }),
  });
  const body = await response.json().catch(() => ({}));
  if (!response.ok || !body?.authenticated) {
    throw new Error(`登录失败 ${response.status}: ${JSON.stringify(body)}`);
  }

  const setCookie = response.headers.getSetCookie?.() ?? [];
  const cookieLine = setCookie.find((line) => line.startsWith(`${USER_COOKIE}=`))
    ?? response.headers.get('set-cookie');
  const match = String(cookieLine ?? '').match(new RegExp(`${USER_COOKIE}=([^;]+)`));
  const token = match?.[1] ? decodeURIComponent(match[1]) : null;
  if (!token) {
    throw new Error('登录成功但未解析到会话 Cookie');
  }

  reporter.pass('登录', `${username} (${body.user?.id ?? 'unknown-id'})`);
  return {
    token,
    cookie: `${USER_COOKIE}=${token}`,
    user: body.user ?? null,
  };
}

function buildUserMessage(text) {
  return {
    id: crypto.randomUUID(),
    role: 'user',
    content: [{ type: 'text', text }],
    metadata: { userVisible: true, displayText: text },
  };
}

export async function createAgentRun(baseUrl, cookie, { message, sessionId = null }) {
  const requestId = crypto.randomUUID();
  const body = {
    request_id: requestId,
    user_message: buildUserMessage(message),
  };
  if (sessionId) body.session_id = sessionId;

  const response = await fetch(`${baseUrl}/api/agent/runs`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Cookie: cookie,
    },
    body: JSON.stringify(body),
  });
  const payload = await response.json().catch(() => ({}));
  if (!response.ok) {
    throw new Error(`POST /api/agent/runs ${response.status}: ${JSON.stringify(payload)}`);
  }
  const run = payload.run ?? payload;
  return {
    runId: run.id,
    requestId,
    sessionId: run.sessionId ?? run.agent_session_id ?? sessionId ?? null,
    status: run.status,
  };
}

export async function getAgentRun(baseUrl, cookie, runId) {
  const response = await fetch(`${baseUrl}/api/agent/runs/${runId}`, {
    headers: { Cookie: cookie },
  });
  const payload = await response.json().catch(() => ({}));
  if (!response.ok) {
    throw new Error(`GET /api/agent/runs/${runId} ${response.status}: ${JSON.stringify(payload)}`);
  }
  return payload.run ?? payload;
}

export async function getSession(baseUrl, cookie, sessionId) {
  const response = await fetch(`${baseUrl}/api/sessions/${encodeURIComponent(sessionId)}`, {
    headers: { Cookie: cookie },
  });
  const payload = await response.json().catch(() => ({}));
  if (!response.ok) {
    return { ok: false, status: response.status, payload };
  }
  return { ok: true, session: payload };
}

export function extractAssistantTexts(sessionPayload) {
  const conversation = sessionPayload?.conversation
    ?? sessionPayload?.session?.conversation
    ?? sessionPayload?.messages
    ?? [];
  const texts = [];
  for (const message of conversation) {
    if (message?.role !== 'assistant') continue;
    const content = message?.content;
    if (typeof content === 'string') texts.push(content);
    else if (Array.isArray(content)) {
      texts.push(
        content
          .map((item) => (item?.type === 'text' ? item.text ?? '' : ''))
          .join(''),
      );
    }
  }
  return texts.filter(Boolean);
}

export function extractPublicLinks(text, baseUrl) {
  const links = new Set();
  const markdown = /\[[^\]]+\]\((https?:\/\/[^)]+|\/MindSpace\/[^)]+)\)/gi;
  const bare = /(https?:\/\/[^\s)]+?\/MindSpace\/[^\s)]+?\.html)/gi;
  const relative = /(\/MindSpace\/[^\s)]+?\.html)/gi;
  for (const pattern of [markdown, bare, relative]) {
    for (const match of text.matchAll(pattern)) {
      const raw = match[1] ?? match[0];
      if (!raw) continue;
      links.add(raw.startsWith('http') ? raw : new URL(raw, baseUrl).href);
    }
  }
  return [...links];
}

async function listPublicHtmlFiles(publishDir) {
  const publicDir = path.join(publishDir, 'public');
  try {
    const entries = await fs.readdir(publicDir, { withFileTypes: true });
    const files = [];
    for (const entry of entries) {
      if (!entry.isFile() || !entry.name.endsWith('.html')) continue;
      const fullPath = path.join(publicDir, entry.name);
      const stat = await fs.stat(fullPath);
      files.push({
        name: entry.name,
        fullPath,
        mtimeMs: stat.mtimeMs,
        relativePublicPath: `public/${entry.name}`,
      });
    }
    return files;
  } catch {
    return [];
  }
}

export async function snapshotPublicHtml(publishKey) {
  const publishDir = path.join(repoRoot, PUBLISH_ROOT_DIR, publishKey);
  return listPublicHtmlFiles(publishDir);
}

export async function waitForRunTerminal(baseUrl, cookie, runId, timeoutMs) {
  const started = Date.now();
  let last = null;
  while (Date.now() - started < timeoutMs) {
    last = await getAgentRun(baseUrl, cookie, runId);
    if (['succeeded', 'failed'].includes(last.status)) {
      return last;
    }
    await sleep(2000);
  }
  throw new Error(`run ${runId} 超时未完成，最后状态 ${last?.status ?? 'unknown'}`);
}

export async function waitForAssistantGrowth(baseUrl, cookie, sessionId, {
  previousCount = 0,
  previousCombinedLength = 0,
  minChars = 1,
  timeoutMs = 120000,
}) {
  const started = Date.now();
  while (Date.now() - started < timeoutMs) {
    const result = await getSession(baseUrl, cookie, sessionId);
    if (result.ok) {
      const texts = extractAssistantTexts(result.session);
      const combined = texts.join('\n').trim();
      const grew = texts.length > previousCount || combined.length > previousCombinedLength;
      if (grew && combined.length >= minChars) {
        return {
          texts,
          combined,
          elapsedMs: Date.now() - started,
          count: texts.length,
        };
      }
    }
    await sleep(2000);
  }
  return null;
}

export async function verifyPageAccess({
  baseUrl,
  cookie,
  publishKey,
  replyText,
  htmlBefore = [],
  expect = {},
  reporter,
}) {
  const keywords = expect.keywords ?? [];
  const links = extractPublicLinks(replyText, baseUrl);
  let pageUrl = links.find((url) => /\/MindSpace\/.+\.html/i.test(url)) ?? null;

  if (!pageUrl && publishKey) {
    const htmlAfter = await listPublicHtmlFiles(path.join(repoRoot, PUBLISH_ROOT_DIR, publishKey));
    const beforeSet = new Set(htmlBefore.map((item) => item.fullPath));
    const fresh = htmlAfter
      .filter((item) => !beforeSet.has(item.fullPath))
      .sort((a, b) => b.mtimeMs - a.mtimeMs);
    if (fresh[0]) {
      pageUrl = new URL(
        `/MindSpace/${publishKey}/${fresh[0].relativePublicPath}`,
        baseUrl,
      ).href;
      reporter.pass('页面落盘', fresh[0].relativePublicPath);
    }
  }

  if (expect.requirePublicLink !== false) {
    if (!pageUrl) {
      reporter.fail('公网页面链接', '回复中未找到 MindSpace 链接，public/ 也无新 HTML');
      return false;
    }
    reporter.pass('公网页面链接', pageUrl);
  }

  if (pageUrl && expect.requireHttp200 !== false) {
    const response = await fetch(pageUrl, { headers: cookie ? { Cookie: cookie } : {} });
    const html = await response.text();
    if (response.status !== 200) {
      reporter.fail('页面 HTTP 状态', `${response.status} ${pageUrl}`);
      return false;
    }
    reporter.pass('页面 HTTP 200', pageUrl);

    if (keywords.length) {
      const hit = keywords.filter((word) => html.includes(word));
      if (hit.length === 0) {
        reporter.fail('页面内容关键词', `未命中: ${keywords.join(', ')}`);
        return false;
      }
      reporter.pass('页面内容关键词', hit.join(', '));
    }

    if (expect.requireMindspaceCover && !/mindspace-cover/i.test(html)) {
      reporter.fail('页面元数据', '缺少 mindspace-cover');
      return false;
    }
  }

  return true;
}

export async function loadScenario(scenarioId) {
  const scenarioPath = path.join(repoRoot, 'scenarios', `${scenarioId}.json`);
  const raw = await fs.readFile(scenarioPath, 'utf8');
  return JSON.parse(raw);
}

export async function listScenarios() {
  const dir = path.join(repoRoot, 'scenarios');
  const entries = await fs.readdir(dir, { withFileTypes: true });
  const scenarios = [];
  for (const entry of entries) {
    if (!entry.isFile() || !entry.name.endsWith('.json') || entry.name.startsWith('_')) continue;
    const scenario = JSON.parse(await fs.readFile(path.join(dir, entry.name), 'utf8'));
    scenarios.push({
      id: scenario.id ?? entry.name.replace(/\.json$/, ''),
      name: scenario.name ?? scenario.id,
      description: scenario.description ?? '',
    });
  }
  return scenarios;
}