package com.superbiz.agent.controller;

import com.superbiz.agent.service.KnowledgeBaseInitService;
import lombok.Data;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

/**
 * 知识库管理控制器
 * 提供知识库初始化、查询等接口
 */
@RestController
@RequestMapping("/api/knowledge")
public class KnowledgeBaseController {

    private static final Logger logger = LoggerFactory.getLogger(KnowledgeBaseController.class);

    @Autowired
    private KnowledgeBaseInitService initService;

    /**
     * 初始化知识库
     * 扫描 knowledge_base 目录下的所有文档，去重后批量导入到数据库和 Milvus
     *
     * @param force 是否强制重新导入（跳过去重检查）
     * @return 初始化结果
     */
    @PostMapping("/init")
    public ResponseEntity<?> initKnowledgeBase(@RequestParam(defaultValue = "false") boolean force) {
        logger.info("收到知识库初始化请求, force={}", force);

        try {
            KnowledgeBaseInitService.InitResult result = initService.initializeKnowledgeBase(force);

            Map<String, Object> response = new HashMap<>();
            response.put("success", true);
            response.put("message", "知识库初始化完成");
            response.put("scanned", result.getScanned());
            response.put("skipped", result.getSkipped());
            response.put("inserted", result.getInserted());
            response.put("failed", result.getFailed());
            response.put("details", result.getDetails());

            logger.info("知识库初始化成功: 扫描={}, 跳过={}, 新增={}, 失败={}",
                    result.getScanned(), result.getSkipped(), result.getInserted(), result.getFailed());

            return ResponseEntity.ok(response);

        } catch (Exception e) {
            logger.error("知识库初始化失败", e);

            Map<String, Object> response = new HashMap<>();
            response.put("success", false);
            response.put("message", "初始化失败: " + e.getMessage());

            return ResponseEntity.internalServerError().body(response);
        }
    }

    /**
     * 清空 hybrid collection + MySQL api_document + L0 内存索引，
     * 再从 knowledge_base 全量重建 dense+BM25 索引。
     *
     * <p>危险操作：会删除 {@code milvus.collection}（默认 {@code biz}）与文档元数据表数据。
     * 需要显式 confirm=REBUILD。</p>
     */
    @PostMapping("/rebuild-hybrid")
    public ResponseEntity<?> rebuildHybrid(
            @RequestParam(defaultValue = "") String confirm) {
        if (!"REBUILD".equals(confirm)) {
            Map<String, Object> rejected = new HashMap<>();
            rejected.put("success", false);
            rejected.put("message", "拒绝执行：请传 confirm=REBUILD 以确认清空并重建");
            rejected.put("hint", "POST /api/knowledge/rebuild-hybrid?confirm=REBUILD");
            return ResponseEntity.badRequest().body(rejected);
        }

        logger.warn("收到 hybrid 知识库全量重建请求 confirm={}", confirm);
        try {
            KnowledgeBaseInitService.RebuildResult result = initService.rebuildHybridFromKnowledgeBase();
            Map<String, Object> response = new HashMap<>();
            response.put("success", result.isSuccess());
            response.put("message", result.isSuccess()
                    ? "hybrid 知识库重建完成"
                    : "hybrid 知识库重建结束，但存在失败项");
            response.put("collection", result.getCollection());
            response.put("basePath", result.getBasePath());
            response.put("milvus", result.getMilvus());
            response.put("mysqlDocumentsBefore", result.getMysqlDocumentsBefore());
            response.put("mysqlDocumentsAfterClear", result.getMysqlDocumentsAfterClear());
            response.put("mysqlDocumentsAfterInit", result.getMysqlDocumentsAfterInit());
            response.put("l0IndexSizeAfterClear", result.getL0IndexSizeAfterClear());
            response.put("l0IndexSizeAfterInit", result.getL0IndexSizeAfterInit());
            if (result.getInit() != null) {
                response.put("scanned", result.getInit().getScanned());
                response.put("skipped", result.getInit().getSkipped());
                response.put("inserted", result.getInit().getInserted());
                response.put("failed", result.getInit().getFailed());
                response.put("details", result.getInit().getDetails());
            }
            return result.isSuccess()
                    ? ResponseEntity.ok(response)
                    : ResponseEntity.status(500).body(response);
        } catch (Exception e) {
            logger.error("hybrid 知识库重建失败", e);
            Map<String, Object> response = new HashMap<>();
            response.put("success", false);
            response.put("message", "重建失败: " + e.getMessage());
            return ResponseEntity.internalServerError().body(response);
        }
    }

    /**
     * 查询知识库统计信息
     *
     * @return 统计信息
     */
    @GetMapping("/stats")
    public ResponseEntity<?> getStats() {
        try {
            KnowledgeBaseInitService.Stats stats = initService.getStats();

            Map<String, Object> response = new HashMap<>();
            response.put("success", true);
            response.put("totalDocuments", stats.getTotalDocuments());
            response.put("totalVectors", stats.getTotalVectors());
            response.put("categories", stats.getCategoryCount());

            return ResponseEntity.ok(response);

        } catch (Exception e) {
            logger.error("查询统计信息失败", e);

            Map<String, Object> response = new HashMap<>();
            response.put("success", false);
            response.put("message", "查询失败: " + e.getMessage());

            return ResponseEntity.internalServerError().body(response);
        }
    }
}