// Package redis ...
//
// Description : redis 系统信息监控
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2021-11-27 12:22 下午
package redis

import (
	"context"
	"strings"

	"git.zhangdeman.cn/zhangdeman/util"

	yml "gopkg.in/yaml.v3"

	"github.com/go-redis/redis/v8"
)

// GetRedisServerInfo 获取 redis server info
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:24 下午 2021/11/27
func GetRedisServerInfo(client *redis.Client) (*ServerInfo, error) {
	var result ServerInfo
	if err := infoToStruct(client, "server", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetMemoryInfo 获取内存信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:59 下午 2021/11/27
func GetMemoryInfo(client *redis.Client) (*MemoryInfo, error) {
	var result MemoryInfo
	if err := infoToStruct(client, "memory", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetClientInfo 获取客户端信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:10 下午 2021/11/27
func GetClientInfo(client *redis.Client) (*ClientInfo, error) {
	var result ClientInfo
	if err := infoToStruct(client, "clients", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetPersistence 获取持久化相关信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:11 下午 2021/11/27
func GetPersistence(client *redis.Client) (*Persistence, error) {
	var result Persistence
	if err := infoToStruct(client, "persistence", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetStats 获取状态
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:19 下午 2021/11/27
func GetStats(client *redis.Client) (*Stats, error) {
	var result Stats
	if err := infoToStruct(client, "stats", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetReplication 复制相关信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:23 下午 2021/11/27
func GetReplication(client *redis.Client) (*Replication, error) {
	var result Replication
	if err := infoToStruct(client, "replication", &result); nil != err {
		return nil, err
	}
	result.SlaveList = GetSlaveList(client)
	return &result, nil
}

// GetSlaveList 获取从库信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 4:26 下午 2021/11/27
func GetSlaveList(client *redis.Client) []SlaveNode {
	// 解析从库信息
	slaveList := make([]SlaveNode, 0)
	var data map[string]string
	_ = infoToStruct(client, "replication", &data)
	slaveKey := []string{"slave0", "slave1", "slave2", "slave3", "slave4", "slave5", "slave6", "slave7", "slave8", "slave9"}
	for k, v := range data {
		isSlave := false
		for _, item := range slaveKey {
			if strings.Contains(k, item) {
				isSlave = true
				break
			}
		}
		if !isSlave {
			continue
		}

		vArr := strings.Split(v, ",")
		if len(vArr) < 3 {
			continue
		}
		slave := SlaveNode{
			ID:     k,
			IP:     "",
			Port:   0,
			State:  "",
			Offset: 0,
			Lag:    0,
		}
		for _, prop := range vArr {
			propArr := strings.Split(prop, "=")
			if len(propArr) != 2 {
				continue
			}
			switch strings.ToLower(propArr[0]) {
			case "ip":
				slave.IP = propArr[1]
			case "port":
				_ = util.ConvertAssign(&slave.Port, propArr[1])
			case "state":
				slave.State = propArr[1]
			case "offset":
				_ = util.ConvertAssign(&slave.Offset, propArr[1])
			case "lag":
				_ = util.ConvertAssign(&slave.Lag, propArr[1])
			}
		}
		slaveList = append(slaveList, slave)
	}
	return slaveList
}

// GetCPUInfo 获取cpu信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:24 下午 2021/11/27
func GetCPUInfo(client *redis.Client) (*CPU, error) {
	var result CPU
	if err := infoToStruct(client, "cpu", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetCommandStats 命令状态
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:27 下午 2021/11/27
func GetCommandStats(client *redis.Client) (*Stats, error) {
	var result Stats
	if err := infoToStruct(client, "stats", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetCommandInfo 获取命令信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 1:32 下午 2021/11/27
func GetCommandInfo(client *redis.Client) ([]CmdStat, error) {
	var result map[string]string
	if err := infoToStruct(client, "commandstats", &result); nil != err {
		return make([]CmdStat, 0), err
	}
	cmdList := make([]CmdStat, 0)
	// 解析数据
	for cmd, detail := range result {
		infoArr := strings.Split(detail, ",")
		if len(infoArr) < 2 {
			// 去掉开始的描述信息
			continue
		}
		info := CmdStat{
			Cmd:           strings.ReplaceAll(strings.ToLower(cmd), "cmdstat_", ""),
			Calls:         0,
			TotalUsedTime: 0,
			AvgUsedTime:   0,
			RejectedCalls: 0,
			FailedCalls:   0,
			SuccessCalls:  0,
		}
		for _, item := range infoArr {
			itemArr := strings.Split(item, "=")
			if len(itemArr) != 2 {
				continue
			}
			switch strings.ToLower(itemArr[0]) {
			case "calls":
				_ = util.ConvertAssign(&info.Calls, itemArr[1])
			case "usec":
				_ = util.ConvertAssign(&info.TotalUsedTime, itemArr[1])
			case "usec_per_call":
				_ = util.ConvertAssign(&info.AvgUsedTime, itemArr[1])
			case "rejected_calls":
				_ = util.ConvertAssign(&info.RejectedCalls, itemArr[1])
			case "failed_calls":
				_ = util.ConvertAssign(&info.FailedCalls, itemArr[1])
			}
		}
		info.SuccessCalls = info.Calls - info.FailedCalls - info.RejectedCalls
		cmdList = append(cmdList, info)
	}
	return cmdList, nil
}

// GetKeyspace 获取 keyspace 信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2:44 下午 2021/11/27
func GetKeyspace(client *redis.Client) ([]DB, error) {
	var result map[string]string
	if err := infoToStruct(client, "keyspace", &result); nil != err {
		return make([]DB, 0), err
	}
	dbList := make([]DB, 0)
	for dbName, item := range result {
		itemArr := strings.Split(item, ",")
		if len(itemArr) < 3 {
			continue
		}
		dbInfo := DB{
			Name:    dbName,
			Keys:    0,
			Expires: 0,
			AvgTTL:  0,
		}
		for _, kv := range itemArr {
			kvArr := strings.Split(kv, "=")
			if len(kvArr) != 2 {
				continue
			}
			switch strings.ToLower(kvArr[0]) {
			case "keys":
				_ = util.ConvertAssign(&dbInfo.Keys, kvArr[1])
			case "expires":
				_ = util.ConvertAssign(&dbInfo.Expires, kvArr[1])
			case "avg_ttl":
				_ = util.ConvertAssign(&dbInfo.AvgTTL, kvArr[1])
			}
		}
		dbList = append(dbList, dbInfo)
	}
	return dbList, nil
}

// GetCluster 获取 cluster 信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:30 下午 2021/11/27
func GetCluster(client *redis.Client) (*Cluster, error) {
	var result Cluster
	if err := infoToStruct(client, "cluster", &result); nil != err {
		return nil, err
	}
	return &result, nil
}

// GetErrorStats 获取错误状态信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:35 下午 2021/11/27
func GetErrorStats(client *redis.Client) ([]Error, error) {
	var result map[string]string
	if err := infoToStruct(client, "errorstats", &result); nil != err {
		return make([]Error, 0), err
	}

	errList := make([]Error, 0)
	for errType, item := range result {
		itemArr := strings.Split(item, "=")
		if len(itemArr) != 2 {
			continue
		}
		errInfo := Error{
			Type:  strings.ReplaceAll(errType, "errorstat_", ""),
			Count: 0,
		}
		_ = util.ConvertAssign(&errInfo.Count, itemArr[1])
		errList = append(errList, errInfo)
	}
	return errList, nil
}

// infoToStruct 读取到的数据,解析到结构体
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:28 下午 2021/11/27
func infoToStruct(client *redis.Client, module string, receiver interface{}) error {
	data := client.Info(context.Background(), module).String()
	// yaml 文件规范要求, key: val , 注意 : 的后面有空格
	data = strings.ReplaceAll(data, ":", ": ")
	return yml.Unmarshal([]byte(data), receiver)
}