import { buildCodeRunCompletionReply } from './agent-run-gateway.mjs';
import { enforcePageGenerationCursorRuntime } from './cursor-page-routing.mjs';

const DEFAULT_POLL_MS = 2000;

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

function buildWechatCursorUserMessage({
  displayText,
  intentKind,
}) {
  const taskText = String(displayText ?? '').trim();
  return {
    role: 'user',
    content: [{ type: 'text', text: taskText }],
    metadata: {
      displayText: taskText,
      memindRun: {
        channel: 'wechat_mp',
        wechatCursorChannel: true,
        taskType: 'wechat_page_generate',
        toolMode: 'code',
        requiredExecutor: 'cursor',
        intentKind: String(intentKind ?? '').trim() || null,
      },
    },
  };
}

async function readCursorCompletionText(agentRunGateway, userId, runId) {
  const eventsResult = await agentRunGateway.listRunEventsForUser(userId, runId, { limit: 200 });
  const events = Array.isArray(eventsResult?.events) ? eventsResult.events : [];
  const resultEvent = [...events].reverse().find((item) => item.eventType === 'tool_gateway_result');
  if (!resultEvent?.data) {
    return buildCodeRunCompletionReply({ executor: 'cursor', stdout: '' });
  }
  return buildCodeRunCompletionReply({
    executor: resultEvent.data.executor ?? 'cursor',
    stdout: resultEvent.data.stdoutTail ?? '',
  });
}

export async function executeWechatCursorAgentRun({
  agentRunGateway,
  userId,
  sessionId = null,
  requestId,
  displayText,
  agentPrompt,
  intentKind = 'page.generate',
  timeoutMs = 15 * 60 * 1000,
  pollMs = DEFAULT_POLL_MS,
  logger = console,
} = {}) {
  if (!agentRunGateway?.createRun || !agentRunGateway?.dispatchRun || !agentRunGateway?.getRunForUser) {
    throw Object.assign(new Error('WeChat Cursor 执行网关不可用'), {
      code: 'WECHAT_CURSOR_GATEWAY_UNAVAILABLE',
    });
  }

  let userMessage = buildWechatCursorUserMessage({ displayText, intentKind });
  const cursorRuntime = enforcePageGenerationCursorRuntime(userMessage, {
    rawToolMode: 'code',
    taskType: 'wechat_page_generate',
    env: process.env,
  });
  userMessage = cursorRuntime.userMessage;

  const run = await agentRunGateway.createRun(userId, {
    sessionId,
    requestId,
    userMessage,
    toolMode: 'code',
    taskType: cursorRuntime.taskType ?? 'h5_chat_code_task',
  });
  agentRunGateway.dispatchRun(run.id);

  const deadline = Date.now() + Math.max(0, Number(timeoutMs) || 0);
  while (Date.now() <= deadline) {
    const latest = await agentRunGateway.getRunForUser(userId, run.id);
    if (!latest) {
      throw Object.assign(new Error('WeChat Cursor 任务丢失'), {
        code: 'WECHAT_CURSOR_RUN_MISSING',
      });
    }
    if (latest.status === 'succeeded') {
      const text = await readCursorCompletionText(agentRunGateway, userId, run.id);
      logger.info?.('[wechat-cursor] run succeeded', {
        userId,
        runId: run.id,
        requestId,
      });
      return {
        text,
        tokenState: null,
        messages: [{
          role: 'assistant',
          content: [{ type: 'text', text }],
          metadata: { userVisible: true, source: 'wechat-cursor-agent-run' },
        }],
        requestMessages: [],
      };
    }
    if (latest.status === 'failed') {
      const error = new Error(latest.error || 'WeChat Cursor 执行失败');
      error.code = 'WECHAT_CURSOR_RUN_FAILED';
      throw error;
    }
    await sleep(Math.max(500, Number(pollMs) || DEFAULT_POLL_MS));
  }

  throw Object.assign(new Error('WeChat Cursor 执行超时'), {
    code: 'WECHAT_CURSOR_RUN_TIMEOUT',
  });
}