package com.ruoyi.websocket.service;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import com.alibaba.fastjson2.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

/**
 * 白板房间服务：按房间维度将白板数据存储于 Redis
 */
@Service
public class WhiteboardRoomService {

    private static final String ROOM_WHITEBOARDS_PREFIX = "room:";
    private static final String ROOM_WHITEBOARDS_SUFFIX = ":whiteboards";
    private static final int EXPIRE_DAYS = 60;

    @Autowired
    @Qualifier("stringObjectRedisTemplate")
    private RedisTemplate<String, Object> redisTemplate;

    private String whiteboardsKey(Long roomId) {
        return ROOM_WHITEBOARDS_PREFIX + roomId + ROOM_WHITEBOARDS_SUFFIX;
    }

    /** 获取房间下所有白板列表 */
    @SuppressWarnings("unchecked")
    public List<Object> listWhiteboards(Long roomId) {
        if (roomId == null) return new ArrayList<>();
        String key = whiteboardsKey(roomId);
        Object raw = redisTemplate.opsForValue().get(key);
        if (raw == null) return new ArrayList<>();
        if (raw instanceof List) return (List<Object>) raw;
        if (raw instanceof String) {
            try {
                return JSON.parseArray((String) raw);
            } catch (Exception e) {
                return new ArrayList<>();
            }
        }
        return new ArrayList<>();
    }

    /** 获取单个白板详情 */
    public Object getWhiteboard(Long roomId, String whiteboardId) {
        List<Object> list = listWhiteboards(roomId);
        for (Object item : list) {
            if (item instanceof java.util.Map) {
                Object id = ((java.util.Map<?, ?>) item).get("id");
                if (whiteboardId.equals(String.valueOf(id))) return item;
            }
        }
        return null;
    }

    /** 创建白板 */
    public Object createWhiteboard(Long roomId, Object whiteboard) {
        if (roomId == null || whiteboard == null) return null;
        List<Object> list = listWhiteboards(roomId);
        String id = UUID.randomUUID().toString();
        Object wb = whiteboard;
        if (wb instanceof java.util.Map) {
            ((java.util.Map<String, Object>) wb).put("id", id);
            if (!((java.util.Map<String, Object>) wb).containsKey("name")) {
                ((java.util.Map<String, Object>) wb).put("name", "草稿");
            }
            if (!((java.util.Map<String, Object>) wb).containsKey("timeBlocks")) {
                ((java.util.Map<String, Object>) wb).put("timeBlocks", new ArrayList<String>());
            }
            if (!((java.util.Map<String, Object>) wb).containsKey("contentByTime")) {
                ((java.util.Map<String, Object>) wb).put("contentByTime", new java.util.HashMap<String, Object>());
            }
        }
        list.add(wb);
        saveWhiteboards(roomId, list);
        return wb;
    }

    /** 更新白板 */
    public boolean updateWhiteboard(Long roomId, String whiteboardId, Object whiteboard) {
        if (roomId == null || whiteboardId == null || whiteboard == null) return false;
        List<Object> list = listWhiteboards(roomId);
        for (int i = 0; i < list.size(); i++) {
            Object item = list.get(i);
            if (item instanceof java.util.Map) {
                Object id = ((java.util.Map<?, ?>) item).get("id");
                if (whiteboardId.equals(String.valueOf(id))) {
                    if (whiteboard instanceof java.util.Map) {
                        ((java.util.Map<String, Object>) whiteboard).put("id", whiteboardId);
                    }
                    list.set(i, whiteboard);
                    saveWhiteboards(roomId, list);
                    return true;
                }
            }
        }
        return false;
    }

    /** 删除白板 */
    public boolean deleteWhiteboard(Long roomId, String whiteboardId) {
        if (roomId == null || whiteboardId == null) return false;
        List<Object> list = listWhiteboards(roomId);
        boolean removed = list.removeIf(item -> {
            if (item instanceof java.util.Map) {
                Object id = ((java.util.Map<?, ?>) item).get("id");
                return whiteboardId.equals(String.valueOf(id));
            }
            return false;
        });
        if (removed) saveWhiteboards(roomId, list);
        return removed;
    }

    private void saveWhiteboards(Long roomId, List<Object> list) {
        String key = whiteboardsKey(roomId);
        redisTemplate.opsForValue().set(key, list, EXPIRE_DAYS, TimeUnit.DAYS);
    }
}