package com.mydreamjob.notification;

import com.mydreamjob.common.api.ApiResponse;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.servlet.http.HttpServletRequest;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

@Tag(name = "通知", description = "站内通知查询、已读管理")
@RestController
@RequestMapping("/notifications")
@RequiredArgsConstructor
public class NotificationController {

    /** R01-A3：身份只来自安全上下文，不接受请求参数传入的 userId。 */
    private final com.mydreamjob.security.CurrentUserAccessor currentUserAccessor;
    /** R01-A3：requestId 只来自过滤器规范化后的唯一产出点。 */
    private final com.mydreamjob.common.logging.RequestIdAccessor requestIdAccessor;

    private final NotificationService notificationService;

    @Operation(summary = "通知列表", description = "当前用户的通知，分页，按时间倒序")
    @GetMapping
    public ResponseEntity<ApiResponse<Map<String, Object>>> list(
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size,
            HttpServletRequest request) {
        Long userId = currentUserAccessor.requireUserId();
        Page<Notification> result = notificationService.list(userId, page, size);
        Map<String, Object> data = new HashMap<>();
        data.put("items", result.getContent().stream().map(notificationService::toView).collect(Collectors.toList()));
        data.put("total", result.getTotalElements());
        data.put("page", result.getNumber());
        data.put("size", result.getSize());
        data.put("totalPages", result.getTotalPages());
        return ResponseEntity.ok(ApiResponse.ok(data, requestIdAccessor.get(request)));
    }

    @Operation(summary = "标记已读", description = "标记单条通知已读（幂等）")
    @PostMapping("/{id}/read")
    public ResponseEntity<ApiResponse<Map<String, Object>>> markRead(
            @PathVariable Long id,
            HttpServletRequest request) {
        Long userId = currentUserAccessor.requireUserId();
        notificationService.markRead(userId, id);
        return ResponseEntity.ok(ApiResponse.ok(Map.of("message", "marked as read"), requestIdAccessor.get(request)));
    }

    @Operation(summary = "全部已读", description = "标记当前用户全部通知已读（幂等）")
    @PostMapping("/read-all")
    public ResponseEntity<ApiResponse<Map<String, Object>>> markAllRead(HttpServletRequest request) {
        Long userId = currentUserAccessor.requireUserId();
        int marked = notificationService.markAllRead(userId);
        return ResponseEntity.ok(ApiResponse.ok(Map.of("marked", marked), requestIdAccessor.get(request)));
    }

    @Operation(summary = "未读数", description = "当前用户未读通知数")
    @GetMapping("/unread-count")
    public ResponseEntity<ApiResponse<Map<String, Object>>> unreadCount(HttpServletRequest request) {
        Long userId = currentUserAccessor.requireUserId();
        long count = notificationService.unreadCount(userId);
        return ResponseEntity.ok(ApiResponse.ok(Map.of("unreadCount", count), requestIdAccessor.get(request)));
    }

}