// Package redis ...
//
// Description : redis 客户端
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2021-02-27 4:49 下午
package redis

import (
	"context"
	"git.zhangdeman.cn/zhangdeman/consts"
	"strings"
	"sync"
	"time"

	"git.zhangdeman.cn/zhangdeman/redis/abstract"
	"git.zhangdeman.cn/zhangdeman/redis/define"
	wrapperOperate "git.zhangdeman.cn/zhangdeman/wrapper"
	"github.com/pkg/errors"
	redisClient "github.com/redis/go-redis/v9"
	"go.uber.org/zap"
)

var (
	Client abstract.IRedisClient
)

func init() {
	Client = &OwnClient{
		lock:              &sync.RWMutex{},
		instanceTable:     make(map[string]*define.ClientInfo),
		whiteCommandTable: make(map[string]bool),
	}
}

type OwnClient struct {
	lock              *sync.RWMutex
	instanceTable     map[string]*define.ClientInfo
	whiteCommandTable map[string]bool
	logger            *zap.Logger
	extraLogFieldList []string
}

func (o *OwnClient) isAllowCommand(command string) bool {
	if len(o.whiteCommandTable) == 0 {
		// 未配置, 视为全部允许执行
		return true
	}
	if o.whiteCommandTable["*"] {
		// 配置了 * 视为全部允许执行
		return true
	}
	command = strings.ToLower(strings.TrimSpace(command))
	o.lock.RLock()
	defer o.lock.RUnlock()
	return o.whiteCommandTable[command]
}

// Exec 执行命令
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:05 2024/6/19
func (o *OwnClient) Exec(ctx context.Context, instanceFlag string, command string, args ...any) *define.RedisResult {
	if nil == ctx {
		ctx = context.Background()
	}
	var (
		instance *define.ClientInfo
	)

	cmdParamList := []any{
		command,
	}
	argStrList := make([]string, 0)
	for _, itemArg := range args {
		argStrList = append(argStrList, wrapperOperate.AnyDataType(itemArg).ToString().Value())
		cmdParamList = append(cmdParamList, itemArg)
	}
	res := &define.RedisResult{
		StartTime:    time.Now().UnixMilli(),
		FinishTime:   0,
		UsedTime:     0,
		Result:       "",
		Command:      command,
		ArgList:      argStrList,
		Err:          nil,
		InstanceFlag: instanceFlag,
	}
	defer func() {
		res.FinishTime = time.Now().UnixMilli()
		res.UsedTime = res.FinishTime - res.StartTime
		if nil == o.logger {
			// 未注入日志实例
			return
		}
		logDataList := []zap.Field{
			zap.Int64("start_time", res.StartTime),
			zap.Int64("finish_time", res.FinishTime),
			zap.Int64("used_time", res.UsedTime),
			zap.String("command", res.Command),
			zap.String("arg_list", strings.Join(res.ArgList, " ")),
			zap.String("execute_result", res.Result),
			zap.Error(res.Err),
		}
		for _, item := range o.extraLogFieldList {
			logDataList = append(logDataList, zap.Any(item, ctx.Value(item)))
		}
		o.logger.Info(
			"Redis命令执行记录",
			logDataList...,
		)
	}()
	if instance, res.Err = o.GetRealClientWithError(instanceFlag); nil != res.Err {
		return res
	}
	if nil == ctx {
		ctx = context.Background()
	}
	if instance.ReadOnly && o.isWriteCommand(command) {
		// 只读实例, 尝试执行写命令
		res.Err = errors.New(instanceFlag + " : instance is read only")
		return res
	}
	if instance.ReadOnly && o.isWriteCommand(command) && instance.MasterClient() == nil {
		// 写命令, 没有主库连接
		res.Err = errors.New(instanceFlag + " : instance master client is nil")
		return res
	}
	redisRealClient := instance.MasterClient()
	if !o.isWriteCommand(command) {
		redisRealClient = instance.SlaveClient()
	}
	cmdRes := redisRealClient.Do(ctx, cmdParamList...)
	if res.Err = cmdRes.Err(); nil != res.Err {
		return res
	}
	res.Result = wrapperOperate.AnyDataType(cmdRes.Val()).ToString().Value()
	return res
}

// SetCommandWhiteList 设置命令白名单, 空 或者 包含 * 则认为所有命令均允许执行
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:02 2024/6/19
func (o *OwnClient) SetCommandWhiteList(commandList []string) {
	o.lock.Lock()
	defer o.lock.Unlock()
	for _, itemCommand := range commandList {
		o.whiteCommandTable[strings.ToLower(strings.TrimSpace(itemCommand))] = true
	}
}

func (o *OwnClient) GetRealClient(instanceFlag string) *define.ClientInfo {
	o.lock.RLock()
	defer o.lock.RUnlock()
	return o.instanceTable[instanceFlag]
}

func (o *OwnClient) GetRealClientWithError(instanceFlag string) (*define.ClientInfo, error) {
	o.lock.RLock()
	defer o.lock.RUnlock()
	instance, exist := o.instanceTable[instanceFlag]
	if !exist {
		return nil, errors.New(instanceFlag + " : redis instance is not found")
	}
	return instance, nil
}

func (o *OwnClient) AddClient(instanceFlag string, instanceConfig *define.Config) error {
	if nil == instanceConfig.Master && !instanceConfig.ReadOnly {
		// 不是只读, 则要求 主库配置 和 从库配置都要存在
		return errors.New(instanceFlag + " : master config is nil")
	}

	clientInfo := &define.ClientInfo{
		ReadOnly: instanceConfig.ReadOnly,
		Master:   nil,
		Slave:    nil,
	}

	if nil != instanceConfig.Master {
		clientInfo.Master = o.newClient(instanceConfig.Master)
	}
	if nil != instanceConfig.Slave {
		clientInfo.Master = o.newClient(instanceConfig.Slave)
	}
	o.lock.Lock()
	defer o.lock.Unlock()
	o.instanceTable[instanceFlag] = clientInfo
	return nil
}

func (o *OwnClient) RemoveClient(instanceFlag string) {
	o.lock.Lock()
	defer o.lock.Unlock()
	delete(o.instanceTable, instanceFlag)
}

func (o *OwnClient) SetLogger(loggerInstance *zap.Logger, extraLogFieldList []string) {
	o.logger = loggerInstance
	o.extraLogFieldList = extraLogFieldList
}

// isWriteCommand 判断是否写命令
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 16:22 2024/10/8
func (o *OwnClient) isWriteCommand(command string) bool {
	return wrapperOperate.ArrayType([]string{
		consts.RedisCommandDel,
		consts.RedisCommandSet,
		consts.RedisCommandLpush,
		consts.RedisCommandRpush,
		consts.RedisCommandMSet,
		consts.RedisCommandPublish,
		consts.RedisCommandPsubScribe,
	}).Has(strings.ToUpper(command)) >= 0
}

// newClient 获取客户端连接
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 16:12 2024/10/8
func (o *OwnClient) newClient(instanceConfig *define.Options) *redisClient.Client {
	return redisClient.NewClient(&redisClient.Options{
		DB:         instanceConfig.DB,
		Addr:       instanceConfig.Addr,
		ClientName: instanceConfig.ClientName,
		Dialer:     nil,
		OnConnect: func(ctx context.Context, cn *redisClient.Conn) error {
			return nil
		},
		// Protocol:                   0,
		Username: instanceConfig.Username,
		Password: instanceConfig.Password,
		// CredentialsProvider:        nil,
		// CredentialsProviderContext: nil,
		MaxRetries:      instanceConfig.MaxRetries,
		MinRetryBackoff: time.Duration(instanceConfig.MinRetryBackoff) * time.Millisecond,
		MaxRetryBackoff: time.Duration(instanceConfig.MaxRetryBackoff) * time.Millisecond,
		DialTimeout:     time.Duration(instanceConfig.DialTimeout) * time.Millisecond,
		ReadTimeout:     time.Duration(instanceConfig.ReadTimeout) * time.Millisecond,
		WriteTimeout:    time.Duration(instanceConfig.WriteTimeout) * time.Millisecond,
		// ContextTimeoutEnabled:      instanceConfig.ContextTimeoutEnabled,
		PoolFIFO:     instanceConfig.PoolFIFO,
		PoolSize:     instanceConfig.PoolSize,
		PoolTimeout:  time.Duration(instanceConfig.PoolTimeout) * time.Millisecond,
		MinIdleConns: instanceConfig.MinIdleConn,
		// MaxIdleConns:               instanceConfig.MaxIdleConn,
		// MaxActiveConns:             instanceConfig.MaxActiveConn,
		// ConnMaxIdleTime:            time.Duration(instanceConfig.ConnMaxIdleTime) * time.Second,
		// ConnMaxLifetime:            time.Duration(instanceConfig.ConnMaxIdleTime) * time.Second,
		TLSConfig: nil,
		// DisableIndentity:           instanceConfig.DisableIdentity,
		// IdentitySuffix:             instanceConfig.IdentitySuffix,
	})
}