/**
 * 统一服务层异常处理并输出标准响应结构。
 */
const sendServiceResult = async (reply, action) => {
  try {
    const data = await action();
    return reply.send(data);
  } catch (error) {
    const statusCode = Number(error?.statusCode) || 500;
    return reply.code(statusCode).send({
      ok: false,
      error: error?.message ?? "internal error"
    });
  }
};

/**
 * GraphRAG 控制器：负责请求转发与响应封装。
 */
export const createGraphRagController = (service, multiAgentService) => ({
  health: async (_request, reply) => reply.send({ ok: true }),
  ready: async (_request, reply) => sendServiceResult(reply, () => service.ready()),
  bootstrap: async (_request, reply) => sendServiceResult(reply, () => service.bootstrap()),
  listUsers: async (request, reply) => sendServiceResult(reply, () => service.listUsers(request.query.limit || 200)),
  getGraphStats: async (request, reply) => sendServiceResult(reply, () => service.getGraphStats(request.query.userId || 'default')),
  ingest: async (request, reply) => sendServiceResult(reply, () => service.ingest(request.body)),
  queryTimeline: async (request, reply) =>
    sendServiceResult(reply, () => service.queryTimeline(request.body)),
  queryGraphRag: async (request, reply) =>
    sendServiceResult(reply, () => service.queryGraphRag(request.body)),
  queryGraphRagMultiRound: async (request, reply) =>
    sendServiceResult(reply, () => service.queryGraphRagMultiRound(request.body)),
  queryGraphRagMultiRoundStream: async (request, reply) => {
    reply.hijack();
    const raw = reply.raw;
    const requestOrigin = request.headers.origin;
    raw.setHeader('Access-Control-Allow-Origin', requestOrigin || '*');
    raw.setHeader('Vary', 'Origin');
    raw.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');
    raw.setHeader('Access-Control-Allow-Methods', 'POST, OPTIONS');
    raw.setHeader('Content-Type', 'text/event-stream; charset=utf-8');
    raw.setHeader('Cache-Control', 'no-cache, no-transform');
    raw.setHeader('Connection', 'keep-alive');
    raw.setHeader('X-Accel-Buffering', 'no');
    raw.flushHeaders?.();
    const push = (event, data) => {
      raw.write(`event: ${event}\n`);
      raw.write(`data: ${JSON.stringify(data)}\n\n`);
    };
    try {
      const result = await service.queryGraphRagMultiRound(request.body, {
        onProgress: (event) => push('progress', event)
      });
      push('done', result);
    } catch (error) {
      push('error', {
        ok: false,
        statusCode: Number(error?.statusCode) || 500,
        message: error?.message || 'internal error'
      });
    } finally {
      raw.end();
    }
  },
  analyzeAndIngest: async (request, reply) =>
    sendServiceResult(reply, () => service.incrementalUpdate(request.body.text, request.body.userId || 'default')),
  reindexUserVectors: async (request, reply) =>
    sendServiceResult(reply, () => service.reindexUserVectors({
      userId: request.body.userId || 'default',
      limit: request.body.limit
    })),
  analyzeAndIngestStream: async (request, reply) => {
    reply.hijack();
    const raw = reply.raw;
    const requestOrigin = request.headers.origin;
    raw.setHeader('Access-Control-Allow-Origin', requestOrigin || '*');
    raw.setHeader('Vary', 'Origin');
    raw.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');
    raw.setHeader('Access-Control-Allow-Methods', 'POST, OPTIONS');
    raw.setHeader('Content-Type', 'text/event-stream; charset=utf-8');
    raw.setHeader('Cache-Control', 'no-cache, no-transform');
    raw.setHeader('Connection', 'keep-alive');
    raw.setHeader('X-Accel-Buffering', 'no');
    raw.flushHeaders?.();
    const push = (event, data) => {
      raw.write(`event: ${event}\n`);
      raw.write(`data: ${JSON.stringify(data)}\n\n`);
    };
    try {
      push('progress', { stage: 'start' });
      const result = await service.incrementalUpdate(
        request.body.text,
        request.body.userId || 'default',
        {
          parallelism: request.body.parallelism,
          expertReview: request.body.expertReview,
          onProgress: (event) => push('progress', event)
        }
      );
      push('done', result);
    } catch (error) {
      push('error', {
        ok: false,
        statusCode: Number(error?.statusCode) || 500,
        message: error?.message || 'internal error'
      });
    } finally {
      raw.end();
    }
  },
  queryHistory: async (request, reply) =>
    sendServiceResult(reply, () => service.queryRelationshipHistory(
      request.body.userId || 'default',
      request.body.queryType || 'all',
      request.body.limit || 20
    )),
  getAdvice: async (request, reply) =>
    sendServiceResult(reply, () => service.getRelationshipAdvice(request.body.userId || 'default')),
  decomposeMultiAgentTask: async (request, reply) =>
    sendServiceResult(reply, () => multiAgentService.decomposeTask(request.body)),
  executeMultiAgentTask: async (request, reply) =>
    sendServiceResult(reply, () => multiAgentService.executeTaskWorkflow(request.body))
});