package com.kaidi.oa.web;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.common.NotFoundException;
import com.kaidi.oa.domain.Message;
import com.kaidi.oa.domain.SysUser;
import com.kaidi.oa.repository.MessageRepository;
import com.kaidi.oa.service.AuthorizationService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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

/**
 * 统一消息中心 API. Identity comes from the auth token (server-authoritative): a user
 * only ever sees / clears their own messages. Drives the 顶栏铃铛 unread badge + the
 * message list page.
 */
@RestController
@RequestMapping("/api/oa/messages")
public class MessageController {

    private final MessageRepository messageRepo;
    private final CurrentUserResolver currentUser;
    private final AuthorizationService authz;

    public MessageController(MessageRepository messageRepo, CurrentUserResolver currentUser,
                             AuthorizationService authz) {
        this.messageRepo = messageRepo;
        this.currentUser = currentUser;
        this.authz = authz;
    }

    /**
     * GET /messages — my latest messages (newest first). 按名投递查询后再按稳定 recipientId 过滤：
     * recipientId 命中本人才返回；recipientId 为空(旧行/未解析)时回退按名（查询已按名命中，自然保留）。
     * 这样可堵住"改名后新用户占用旧名、把旧用户站内信连同正文读走"的改名重用泄漏。
     */
    @GetMapping
    public ApiResp<List<Message>> list(HttpServletRequest request) {
        SysUser su = currentUser.resolve(request);
        String me = currentUser.resolveLabel(request);
        return ApiResp.ok(messageRepo.findTop200ByRecipientOrderByIdDesc(me).stream()
                .filter(m -> authz.isOwner(su, m.getRecipientId(), m.getRecipient()))
                .toList());
    }

    /** GET /messages/unread-count — my unread count (for the bell badge). 同 list：按 recipientId 过滤后计数。 */
    @GetMapping("/unread-count")
    public ApiResp<Map<String, Object>> unreadCount(HttpServletRequest request) {
        SysUser su = currentUser.resolve(request);
        String me = currentUser.resolveLabel(request);
        long count = messageRepo.findByRecipientAndReadFalse(me).stream()
                .filter(m -> authz.isOwner(su, m.getRecipientId(), m.getRecipient()))
                .count();
        Map<String, Object> m = new LinkedHashMap<>();
        m.put("count", count);
        return ApiResp.ok(m);
    }

    /** POST /messages/{id}/read — mark one of my messages read. */
    @PostMapping("/{id}/read")
    public ApiResp<Message> read(@PathVariable Long id, HttpServletRequest request) {
        Message msg = messageRepo.findById(id)
                .orElseThrow(() -> new NotFoundException("message not found: " + id));
        // 对象级读授权：仅收件人本人或 ADMIN 可标记已读并取回正文，杜绝任意登录用户按 id
        // 枚举把他人站内信(含审批正文/退回理由等)正文回吐（读 IDOR）。
        // 身份按稳定 recipientId 比对（空时回退 recipient 名），根治改名重用冒充。
        SysUser su = currentUser.resolve(request);
        boolean isRecipient = authz.isOwner(su, msg.getRecipientId(), msg.getRecipient());
        if (!authz.isAdmin(su) && !isRecipient) {
            throw new ApiException(403, "无权访问：仅收件人本人或管理员可读取/标记该消息");
        }
        if (isRecipient && !msg.isRead()) {
            msg.setRead(true);
            messageRepo.save(msg);
        }
        return ApiResp.ok(msg);
    }

    /** POST /messages/read-all — mark all my messages read. */
    @PostMapping("/read-all")
    public ApiResp<Map<String, Object>> readAll(HttpServletRequest request) {
        SysUser su = currentUser.resolve(request);
        String me = currentUser.resolveLabel(request);
        // 仅标记本人(按 recipientId 命中，空回退名)的未读，杜绝改名重用场景下误标他人未读为已读。
        List<Message> unread = messageRepo.findByRecipientAndReadFalse(me).stream()
                .filter(m -> authz.isOwner(su, m.getRecipientId(), m.getRecipient()))
                .toList();
        for (Message msg : unread) {
            msg.setRead(true);
        }
        messageRepo.saveAll(unread);
        Map<String, Object> m = new LinkedHashMap<>();
        m.put("cleared", unread.size());
        return ApiResp.ok(m);
    }
}