package com.ruoyi.web.controller.monitor;

import com.alibaba.fastjson2.JSON;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.core.cache.InMemoryCacheStats;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.system.domain.SysCache;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 缓存监控
 * 
 * @author ruoyi
 */
@RestController
@RequestMapping("/monitor/cache")
public class CacheController
{
    private final RedisCache redisCache;

    private final static List<SysCache> caches = new ArrayList<SysCache>();
    {
        caches.add(new SysCache(CacheConstants.LOGIN_TOKEN_KEY, "用户信息"));
        caches.add(new SysCache(CacheConstants.SYS_CONFIG_KEY, "配置信息"));
        caches.add(new SysCache(CacheConstants.SYS_DICT_KEY, "数据字典"));
        caches.add(new SysCache(CacheConstants.CAPTCHA_CODE_KEY, "验证码"));
        caches.add(new SysCache(CacheConstants.REPEAT_SUBMIT_KEY, "防重提交"));
        caches.add(new SysCache(CacheConstants.RATE_LIMIT_KEY, "限流处理"));
        caches.add(new SysCache(CacheConstants.PWD_ERR_CNT_KEY, "密码错误次数"));
    }

    public CacheController(RedisCache redisCache)
    {
        this.redisCache = redisCache;
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping()
    public AjaxResult getInfo()
    {
        InMemoryCacheStats stats = redisCache.getCacheStats();
        Map<String, Object> info = new LinkedHashMap<>();
        info.put("cache_type", stats.cacheType());
        info.put("cache_mode", stats.mode());
        info.put("key_size", stats.keySize());
        info.put("hit_count", stats.hitCount());
        info.put("miss_count", stats.missCount());
        info.put("expired_count", stats.expiredCount());
        info.put("write_count", stats.writeCount());

        Map<String, Object> result = new HashMap<>(3);
        result.put("info", info);
        result.put("dbSize", stats.keySize());

        List<Map<String, String>> pieList = new ArrayList<>();
        pieList.add(statEntry("hit_count", stats.hitCount()));
        pieList.add(statEntry("miss_count", stats.missCount()));
        pieList.add(statEntry("expired_count", stats.expiredCount()));
        pieList.add(statEntry("write_count", stats.writeCount()));
        result.put("commandStats", pieList);
        return AjaxResult.success(result);
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping("/getNames")
    public AjaxResult cache()
    {
        return AjaxResult.success(caches);
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping("/getKeys/{cacheName}")
    public AjaxResult getCacheKeys(@PathVariable String cacheName)
    {
        Set<String> cacheKeys = new TreeSet<>(redisCache.keys(cacheName + "*"));
        return AjaxResult.success(cacheKeys);
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping("/getValue/{cacheName}/{cacheKey}")
    public AjaxResult getCacheValue(@PathVariable String cacheName, @PathVariable String cacheKey)
    {
        Object cacheValue = redisCache.getCacheObject(cacheKey);
        SysCache sysCache = new SysCache(cacheName, cacheKey, cacheValueToString(cacheValue));
        return AjaxResult.success(sysCache);
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @DeleteMapping("/clearCacheName/{cacheName}")
    public AjaxResult clearCacheName(@PathVariable String cacheName)
    {
        Collection<String> cacheKeys = redisCache.keys(cacheName + "*");
        redisCache.deleteObject(cacheKeys);
        return AjaxResult.success();
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @DeleteMapping("/clearCacheKey/{cacheKey}")
    public AjaxResult clearCacheKey(@PathVariable String cacheKey)
    {
        redisCache.deleteObject(cacheKey);
        return AjaxResult.success();
    }

    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @DeleteMapping("/clearCacheAll")
    public AjaxResult clearCacheAll()
    {
        redisCache.clear();
        return AjaxResult.success();
    }

    private Map<String, String> statEntry(String name, long value)
    {
        Map<String, String> data = new HashMap<>(2);
        data.put("name", name);
        data.put("value", String.valueOf(value));
        return data;
    }

    private String cacheValueToString(Object cacheValue)
    {
        if (cacheValue == null)
        {
            return StringUtils.EMPTY;
        }
        if (cacheValue instanceof String stringValue)
        {
            return stringValue;
        }
        return JSON.toJSONString(cacheValue);
    }
}
