package com.wecom.robot.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.wecom.robot.dto.*;
import com.wecom.robot.entity.Message;
import com.wecom.robot.entity.Session;
import com.wecom.robot.mapper.MessageMapper;
import com.wecom.robot.mapper.SessionMapper;
import com.wecom.robot.service.SessionManagerService;
import com.wecom.robot.service.WecomApiService;
import com.wecom.robot.service.WebSocketService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;
import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@RestController
@RequestMapping("/api/sessions")
@RequiredArgsConstructor
public class SessionController {

    private final SessionMapper sessionMapper;
    private final MessageMapper messageMapper;
    private final SessionManagerService sessionManagerService;
    private final WecomApiService wecomApiService;
    private final WebSocketService webSocketService;

    @GetMapping
    public ApiResponse<List<SessionInfo>> getSessions(
            @RequestParam(required = false) String status,
            @RequestParam(required = false) String csId,
            @RequestParam(required = false) String channelType) {
        LambdaQueryWrapper<Session> query = new LambdaQueryWrapper<>();

        if (status != null) {
            query.eq(Session::getStatus, status);
        }

        if (csId != null) {
            query.eq(Session::getManualCsId, csId);
        }

        if (channelType != null) {
            query.eq(Session::getChannelType, channelType);
        }

        query.orderByDesc(Session::getUpdatedAt);

        List<Session> sessions = sessionMapper.selectList(query);

        List<SessionInfo> sessionInfos = sessions.stream().map(session -> {
            SessionInfo info = new SessionInfo();
            info.setSessionId(session.getSessionId());
            info.setCustomerId(session.getCustomerId());
            info.setKfId(session.getKfId());
            info.setChannelType(session.getChannelType());
            info.setStatus(session.getStatus());
            info.setManualCsId(session.getManualCsId());
            info.setCreatedAt(session.getCreatedAt());
            info.setUpdatedAt(session.getUpdatedAt());
            info.setMetadata(session.getMetadata());

            LambdaQueryWrapper<Message> msgQuery = new LambdaQueryWrapper<>();
            msgQuery.eq(Message::getSessionId, session.getSessionId())
                    .orderByDesc(Message::getCreatedAt)
                    .last("LIMIT 1");
            Message lastMsg = messageMapper.selectOne(msgQuery);
            if (lastMsg != null) {
                info.setLastMessage(lastMsg.getContent());
                info.setLastMessageTime(lastMsg.getCreatedAt());
            }

            int msgCount = sessionManagerService.getMessageCount(session.getSessionId());
            info.setMessageCount(msgCount);

            return info;
        }).collect(Collectors.toList());

        return ApiResponse.success(sessionInfos);
    }

    @GetMapping("/{sessionId}")
    public ApiResponse<SessionInfo> getSession(@PathVariable String sessionId) {
        Session session = sessionMapper.selectById(sessionId);
        if (session == null) {
            return ApiResponse.error(404, "会话不存在");
        }

        SessionInfo info = new SessionInfo();
        info.setSessionId(session.getSessionId());
        info.setCustomerId(session.getCustomerId());
        info.setKfId(session.getKfId());
        info.setChannelType(session.getChannelType());
        info.setStatus(session.getStatus());
        info.setManualCsId(session.getManualCsId());
        info.setCreatedAt(session.getCreatedAt());
        info.setUpdatedAt(session.getUpdatedAt());
        info.setMetadata(session.getMetadata());

        return ApiResponse.success(info);
    }

    @GetMapping("/{sessionId}/history")
    public ApiResponse<List<MessageInfo>> getSessionHistory(@PathVariable String sessionId) {
        LambdaQueryWrapper<Message> query = new LambdaQueryWrapper<>();
        query.eq(Message::getSessionId, sessionId)
                .orderByAsc(Message::getCreatedAt);

        List<Message> messages = messageMapper.selectList(query);

        List<MessageInfo> messageInfos = messages.stream().map(msg -> {
            MessageInfo info = new MessageInfo();
            info.setMsgId(msg.getMsgId());
            info.setSessionId(msg.getSessionId());
            info.setSenderType(msg.getSenderType());
            info.setSenderId(msg.getSenderId());
            info.setContent(msg.getContent());
            info.setMsgType(msg.getMsgType());
            info.setCreatedAt(msg.getCreatedAt());
            return info;
        }).collect(Collectors.toList());

        return ApiResponse.success(messageInfos);
    }

    @PostMapping("/{sessionId}/accept")
    public ApiResponse<Void> acceptSession(
            @PathVariable String sessionId,
            @Valid @RequestBody AcceptSessionRequest request) {
        Session session = sessionMapper.selectById(sessionId);
        if (session == null) {
            return ApiResponse.error(404, "会话不存在");
        }

        if (!Session.STATUS_PENDING.equals(session.getStatus())) {
            return ApiResponse.error(400, "会话状态不正确");
        }

        sessionManagerService.acceptTransfer(sessionId, request.getCsId());
        webSocketService.notifySessionAccepted(sessionId, request.getCsId());

        return ApiResponse.success(null);
    }

    @PostMapping("/{sessionId}/message")
    public ApiResponse<Void> sendMessage(
            @PathVariable String sessionId,
            @Valid @RequestBody SendMessageRequest request) {
        Session session = sessionMapper.selectById(sessionId);
        if (session == null) {
            return ApiResponse.error(404, "会话不存在");
        }

        if (!Session.STATUS_MANUAL.equals(session.getStatus())) {
            return ApiResponse.error(400, "会话状态不正确");
        }

        boolean success = wecomApiService.sendTextMessage(
                session.getCustomerId(),
                session.getKfId(),
                request.getContent()
        );

        if (!success) {
            return ApiResponse.error(500, "消息发送失败");
        }

        sessionManagerService.saveMessage(
                "manual_" + System.currentTimeMillis(),
                sessionId,
                Message.SENDER_TYPE_MANUAL,
                session.getManualCsId(),
                request.getContent(),
                request.getMsgType() != null ? request.getMsgType() : "text",
                null
        );

        return ApiResponse.success(null);
    }

    @PostMapping("/{sessionId}/close")
    public ApiResponse<Void> closeSession(@PathVariable String sessionId) {
        Session session = sessionMapper.selectById(sessionId);
        if (session == null) {
            return ApiResponse.error(404, "会话不存在");
        }

        sessionManagerService.closeSession(sessionId);
        webSocketService.notifySessionClosed(sessionId);

        return ApiResponse.success(null);
    }
}