package com.pharmacopoeia.controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.pharmacopoeia.config.UnifiedResponse;
import com.pharmacopoeia.dto.*;
import com.pharmacopoeia.entity.QuickAsk;
import com.pharmacopoeia.service.AdminKnowledgeService;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.*;

@UnifiedResponse
@RestController
@RequestMapping("/api/v1/admin/knowledge")
public class AdminKnowledgeController {

    private final AdminKnowledgeService service;
    private final ObjectMapper mapper = new ObjectMapper();

    public AdminKnowledgeController(AdminKnowledgeService service) {
        this.service = service;
    }

    // ==================== 药品管理 ====================

    @GetMapping("/drugs")
    public ResponseEntity<Map<String, Object>> listDrugs(
            @RequestParam(required = false) String keyword,
            @RequestParam(required = false) String category,
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int pageSize) {
        return ResponseEntity.ok(service.listDrugs(keyword, category, page, pageSize));
    }

    @GetMapping("/drugs/{drugId}")
    public ResponseEntity<Map<String, Object>> getDrug(@PathVariable String drugId) {
        return ResponseEntity.ok(service.getDrug(drugId)
                .map(d -> Map.of("data", (Object) d))
                .orElse(Map.of("message", "数据入库后可用", "drug_id", drugId)));
    }

    @PostMapping("/drugs")
    public ResponseEntity<Map<String, Object>> createDrug(@RequestBody DrugCreateRequest req) {
        return ResponseEntity.ok(service.createDrug(objectToMap(req)));
    }

    @PutMapping("/drugs/{drugId}")
    public ResponseEntity<Map<String, Object>> updateDrug(@PathVariable String drugId,
                                                           @RequestBody DrugUpdateRequest req) {
        return ResponseEntity.ok(service.updateDrug(drugId, objectToMap(req)));
    }

    @DeleteMapping("/drugs/{drugId}")
    public ResponseEntity<Map<String, Object>> deleteDrug(@PathVariable String drugId) {
        return ResponseEntity.ok(service.deleteDrug(drugId));
    }

    @PostMapping("/drugs/import")
    public ResponseEntity<Map<String, Object>> importDrugs(@RequestBody ImportRequest req) {
        int count = parseCount(req);
        return ResponseEntity.ok(Map.of(
                "message", "导入任务已提交",
                "total", count,
                "success", 0,
                "failed", 0,
                "note", "Phase 2 实现异步批量写入 + 向量化"
        ));
    }

    @PostMapping("/drugs/reindex")
    public ResponseEntity<Map<String, Object>> reindexDrugs(@RequestBody ReindexRequest req) {
        return ResponseEntity.ok(Map.of(
                "message", "重建索引任务已提交",
                "collection", req.getCollection(),
                "drug_ids", req.getDrugIds(),
                "status", "pending",
                "note", "Phase 2 实现：重新 chunk → 向量化 → 写入 pgvector"
        ));
    }

    // ==================== 知识点管理 ====================

    @GetMapping("/knowledge-points")
    public ResponseEntity<Map<String, Object>> listKnowledgePoints(
            @RequestParam(required = false) String subject,
            @RequestParam(required = false) String chapterId,
            @RequestParam(required = false) Integer difficulty,
            @RequestParam(required = false) String frequency,
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int pageSize) {
        return ResponseEntity.ok(service.listKnowledgePoints(subject, chapterId, difficulty, frequency, page, pageSize));
    }

    @GetMapping("/knowledge-points/{pointId}")
    public ResponseEntity<Map<String, Object>> getKnowledgePoint(@PathVariable String pointId) {
        return ResponseEntity.ok(service.getKnowledgePoint(pointId)
                .<Map<String, Object>>map(kp -> Map.of(
                        "point_id", kp.getPointId(),
                        "subject", kp.getSubject(),
                        "title", kp.getTitle(),
                        "content", kp.getContent()
                ))
                .orElse(Map.of("message", "数据入库后可用", "point_id", pointId)));
    }

    @PostMapping("/knowledge-points")
    public ResponseEntity<Map<String, Object>> createKnowledgePoint(@RequestBody KnowledgePointCreateRequest req) {
        return ResponseEntity.ok(service.createKnowledgePoint(objectToMap(req)));
    }

    @PutMapping("/knowledge-points/{pointId}")
    public ResponseEntity<Map<String, Object>> updateKnowledgePoint(@PathVariable String pointId,
                                                                     @RequestBody KnowledgePointUpdateRequest req) {
        return ResponseEntity.ok(service.updateKnowledgePoint(pointId, objectToMap(req)));
    }

    @DeleteMapping("/knowledge-points/{pointId}")
    public ResponseEntity<Map<String, Object>> deleteKnowledgePoint(@PathVariable String pointId) {
        return ResponseEntity.ok(service.deleteKnowledgePoint(pointId));
    }

    @PostMapping("/knowledge-points/import")
    public ResponseEntity<Map<String, Object>> importKnowledgePoints(@RequestBody ImportRequest req) {
        int count = parseCount(req);
        return ResponseEntity.ok(Map.of(
                "message", "导入任务已提交",
                "total", count,
                "success", 0,
                "failed", 0
        ));
    }

    // ==================== 题库管理 ====================

    @GetMapping("/questions")
    public ResponseEntity<Map<String, Object>> listQuestions(
            @RequestParam(required = false) String subject,
            @RequestParam(required = false) String chapterId,
            @RequestParam(required = false) String questionType,
            @RequestParam(required = false) Integer difficulty,
            @RequestParam(required = false) Boolean audited,
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int pageSize) {
        return ResponseEntity.ok(service.listQuestions(subject, chapterId, questionType, difficulty, audited, page, pageSize));
    }

    @GetMapping("/questions/{questionId}")
    public ResponseEntity<Map<String, Object>> getQuestion(@PathVariable String questionId) {
        return ResponseEntity.ok(service.getQuestion(questionId)
                .<Map<String, Object>>map(q -> Map.of(
                        "question_id", q.getQuestionId(),
                        "content", q.getContent(),
                        "answer", q.getAnswer()
                ))
                .orElse(Map.of("message", "数据入库后可用", "question_id", questionId)));
    }

    @PostMapping("/questions")
    public ResponseEntity<Map<String, Object>> createQuestion(@RequestBody QuestionCreateRequest req) {
        return ResponseEntity.ok(service.createQuestion(objectToMap(req)));
    }

    @PutMapping("/questions/{questionId}")
    public ResponseEntity<Map<String, Object>> updateQuestion(@PathVariable String questionId,
                                                               @RequestBody QuestionUpdateRequest req) {
        return ResponseEntity.ok(service.updateQuestion(questionId, objectToMap(req)));
    }

    @DeleteMapping("/questions/{questionId}")
    public ResponseEntity<Map<String, Object>> deleteQuestion(@PathVariable String questionId) {
        return ResponseEntity.ok(service.deleteQuestion(questionId));
    }

    @PostMapping("/questions/batch-audit")
    public ResponseEntity<Map<String, Object>> batchAudit(@RequestBody BatchAuditRequest req) {
        return ResponseEntity.ok(service.batchAudit(req.getQuestionIds(), req.getAudited()));
    }

    @PostMapping("/questions/import")
    public ResponseEntity<Map<String, Object>> importQuestions(@RequestBody ImportRequest req) {
        int count = parseCount(req);
        return ResponseEntity.ok(Map.of(
                "message", "导入任务已提交",
                "total", count,
                "success", 0,
                "failed", 0
        ));
    }

    @PostMapping("/questions/generate")
    public ResponseEntity<Map<String, Object>> generateQuestions(
            @RequestParam String pointId,
            @RequestParam(defaultValue = "10") int count,
            @RequestParam(defaultValue = "A") String questionType) {
        return ResponseEntity.ok(Map.of(
                "message", "AI 出题任务已提交",
                "point_id", pointId,
                "count", count,
                "question_type", questionType,
                "status", "pending",
                "note", "Phase 2 实现：LLM 根据知识点生成题目"
        ));
    }

    // ==================== 快捷提问标签管理（管理端，需要 JWT） ====================

    @GetMapping("/quick-asks")
    public ResponseEntity<List<QuickAsk>> listAllQuickAsks() {
        return ResponseEntity.ok(service.listAllQuickAsks());
    }

    @PostMapping("/quick-asks")
    public ResponseEntity<Map<String, Object>> createQuickAsk(@RequestBody Map<String, Object> body) {
        String label = (String) body.getOrDefault("label", "");
        String question = (String) body.getOrDefault("question", label);
        int sortOrder = body.get("sort_order") instanceof Integer i ? i : 0;
        return ResponseEntity.ok(service.createQuickAsk(label, question, sortOrder));
    }

    @PutMapping("/quick-asks/{id}")
    public ResponseEntity<Map<String, Object>> updateQuickAsk(
            @PathVariable int id, @RequestBody Map<String, Object> body) {
        String label = body.containsKey("label") ? (String) body.get("label") : null;
        String question = body.containsKey("question") ? (String) body.get("question") : null;
        Integer sortOrder = body.get("sort_order") instanceof Integer i ? i : null;
        Boolean isActive = body.get("is_active") instanceof Boolean b ? b : null;
        return ResponseEntity.ok(service.updateQuickAsk(id, label, question, sortOrder, isActive));
    }

   @DeleteMapping("/quick-asks/{id}")
   public ResponseEntity<Map<String, Object>> deleteQuickAsk(@PathVariable int id) {
       return ResponseEntity.ok(service.deleteQuickAsk(id));
   }

    @PutMapping("/quick-asks/reorder")
    public ResponseEntity<Map<String, Object>> reorderQuickAsks(@RequestBody List<Map<String, Object>> items) {
        return ResponseEntity.ok(service.reorderQuickAsks(items));
    }

    @GetMapping("/quick-asks/audit-log")
    public ResponseEntity<Map<String, Object>> listQuickAskAuditLog(
            @RequestParam(defaultValue = "1") int page,
            @RequestParam(defaultValue = "20") int pageSize) {
        return ResponseEntity.ok(service.listQuickAskAuditLog(page, pageSize));
    }

   // ==================== Helpers ====================

    private int parseCount(ImportRequest req) {
        try {
            if ("json".equals(req.getFormat()) && req.getData() != null) {
                var items = mapper.readTree(req.getData());
                return items.isArray() ? items.size() : 0;
            }
            if ("csv".equals(req.getFormat()) && req.getData() != null) {
                return req.getData().split("\n").length - 1; // rough count
            }
        } catch (Exception ignored) {}
        return 0;
    }

    private Map<String, Object> objectToMap(Object obj) {
        try {
            @SuppressWarnings("unchecked")
            Map<String, Object> map = mapper.convertValue(obj, Map.class);
            return map;
        } catch (Exception e) {
            return Map.of();
        }
    }
}