package com.xuqm.im.controller;

import com.xuqm.common.model.ApiResponse;
import com.xuqm.im.entity.ImAccountEntity;
import com.xuqm.im.entity.ImGroupEntity;
import com.xuqm.im.repository.ImAccountRepository;
import com.xuqm.im.repository.ImGroupRepository;
import com.xuqm.im.repository.ImMessageRepository;
import com.xuqm.im.service.ImAccountService;
import com.xuqm.im.service.ImGroupService;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/api/im/admin")
public class ImAdminController {

    private final ImAccountRepository accountRepository;
    private final ImGroupRepository groupRepository;
    private final ImMessageRepository messageRepository;
    private final ImAccountService accountService;
    private final ImGroupService groupService;

    public ImAdminController(ImAccountRepository accountRepository,
                             ImGroupRepository groupRepository,
                             ImMessageRepository messageRepository,
                             ImAccountService accountService,
                             ImGroupService groupService) {
        this.accountRepository = accountRepository;
        this.groupRepository = groupRepository;
        this.messageRepository = messageRepository;
        this.accountService = accountService;
        this.groupService = groupService;
    }

    /** List all registered IM users for the given appId. */
    @GetMapping("/users")
    public ResponseEntity<ApiResponse<Page<ImAccountEntity>>> listUsers(
            @RequestParam String appId,
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size) {
        return ResponseEntity.ok(ApiResponse.success(
                accountRepository.findByAppId(appId, PageRequest.of(page, size))));
    }

    /** Ban or unban a user. */
    @PutMapping("/users/{userId}/status")
    public ResponseEntity<ApiResponse<ImAccountEntity>> updateUserStatus(
            @RequestParam String appId,
            @PathVariable String userId,
            @RequestBody Map<String, String> body) {
        ImAccountEntity account = accountRepository.findByAppIdAndUserId(appId, userId)
                .orElseThrow(() -> new RuntimeException("User not found"));
        account.setStatus(ImAccountEntity.Status.valueOf(body.get("status").toUpperCase()));
        return ResponseEntity.ok(ApiResponse.success(accountRepository.save(account)));
    }

    /** List all groups for the given appId. */
    @GetMapping("/groups")
    public ResponseEntity<ApiResponse<List<ImGroupEntity>>> listGroups(@RequestParam String appId) {
        return ResponseEntity.ok(ApiResponse.success(groupRepository.findByAppId(appId)));
    }

    /** Admin registers a new IM user (or returns existing). */
    @PostMapping("/users")
    public ResponseEntity<ApiResponse<ImAccountEntity>> registerUser(
            @RequestParam String appId,
            @RequestBody RegisterUserRequest req) {
        accountService.loginOrRegister(appId, req.userId(), req.nickname(), req.avatar());
        ImAccountEntity account = accountRepository.findByAppIdAndUserId(appId, req.userId())
                .orElseThrow();
        return ResponseEntity.ok(ApiResponse.success(account));
    }

    /** Admin creates a group. */
    @PostMapping("/groups")
    public ResponseEntity<ApiResponse<ImGroupEntity>> createGroup(
            @RequestParam String appId,
            @RequestBody CreateGroupRequest req) {
        return ResponseEntity.ok(ApiResponse.success(
                groupService.create(appId, req.name(), req.creatorId(), req.memberIds())));
    }

    /** Message statistics for the given appId. */
    @GetMapping("/stats")
    public ResponseEntity<ApiResponse<Map<String, Object>>> stats(@RequestParam String appId) {
        long totalMessages = messageRepository.countByAppId(appId);
        long totalUsers    = accountRepository.countByAppId(appId);
        long totalGroups   = groupRepository.countByAppId(appId);
        long todayMessages = messageRepository.countTodayByAppId(appId);

        return ResponseEntity.ok(ApiResponse.success(Map.of(
                "totalMessages", totalMessages,
                "totalUsers",    totalUsers,
                "totalGroups",   totalGroups,
                "todayMessages", todayMessages
        )));
    }

    public record RegisterUserRequest(String userId, String nickname, String avatar) {}
    public record CreateGroupRequest(String name, String creatorId, List<String> memberIds) {}
}