// Package redis ...
//
// Description : redis ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022-06-15 11:52
package redis

import (
	"fmt"
	"time"

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

	"git.zhangdeman.cn/zhangdeman/logger"
)

// FullConfig 完整配置
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:23 2022/6/15
type FullConfig struct {
	Logger *logger.InputLogConfig `json:"logger" yaml:"logger"` // 日志配置
	Master *Config                `json:"master" yaml:"master"` // 主节点
	Slave  *Config                `json:"slave" yaml:"slave"`   // 从节点
}

// Config redis的配置
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:52 2022/6/15
type Config struct {
	Network string `json:"network" yaml:"network"` // 连接方式 tcp 或 unix , 默认 tcp
	Host    string `yaml:"host" json:"host"`       // 地址
	Port    int    `yaml:"port" json:"port"`       // 端口

	// Dialer creates new network connection and has priority over
	// Network and Addr options.
	// Dialer func(ctx context.Context, network, addr string) (net.Conn, error)

	// Hook that is called when new connection is established.
	// OnConnect func(ctx context.Context, cn *redis.Conn) error

	// Use the specified Username to authenticate the current connection
	// with one of the connections defined in the ACL list when connecting
	// to a Redis 6.0 instance, or greater, that is using the Redis ACL system.
	Username string `json:"username" yaml:"username"` // 账号
	// Optional password. Must match the password specified in the
	// requirepass server configuration option (if connecting to a Redis 5.0 instance, or lower),
	// or the User Password when connecting to a Redis 6.0 instance, or greater,
	// that is using the Redis ACL system.
	Password string `json:"password" yaml:"password"` // 密码

	// Database to be selected after connecting to the server.
	DB int `json:"db" yaml:"db"` // 选中的数据库

	// Maximum number of retries before giving up.
	// Default is 3 retries; -1 (not 0) disables retries.
	MaxRetries int `json:"max_retries" yaml:"max_retries"` // 最大重试次数, 默认 3 ,  -1 为不重试
	// Minimum backoff between each retry.
	// Default is 8 milliseconds; -1 disables backoff.
	MinRetryBackoff int64 `json:"min_retry_backoff" yaml:"min_retry_backoff"` // 最小重试的时间间隔, 默认 8ms, -1禁用
	// Maximum backoff between each retry.
	// Default is 512 milliseconds; -1 disables backoff.
	MaxRetryBackoff int `json:"max_retry_backoff" yaml:"max_retry_backoff"` // 最大重试的时间间隔, 默认 512ms, -1禁用

	// Dial timeout for establishing new connections.
	// Default is 5 seconds.
	DialTimeout int64 `json:"dial_timeout" yaml:"dial_timeout"` // 建立新连接的超时时间, 默认 5s
	// Timeout for socket reads. If reached, commands will fail
	// with a timeout instead of blocking. Use value -1 for no timeout and 0 for default.
	// Default is 3 seconds.
	ReadTimeout int64 `json:"read_timeout" yaml:"read_timeout"` // 读取超时时间，默认 3s , -1 不设置超时
	// Timeout for socket writes. If reached, commands will fail
	// with a timeout instead of blocking.
	// Default is ReadTimeout.
	WriteTimeout int64 `json:"write_timeout" yaml:"write_timeout"` // 写入超时时间, 默认值和 ReadTimeout 配置一致

	// Type of connection pool.
	// true for FIFO pool, false for LIFO pool.
	// Note that fifo has higher overhead compared to lifo.
	PoolFIFO bool `json:"pool_fifo" yaml:"pool_fifo"` // 连接吃采用 FIFO
	// Maximum number of socket connections.
	// Default is 10 connections per every available CPU as reported by runtime.GOMAXPROCS.
	PoolSize int `json:"pool_size" yaml:"pool_size"` // 连接池大小, 默认 runtime.GOMAXPROCS * 10
	// Minimum number of idle connections which is useful when establishing
	// new connection is slow.
	MinIdleConns int `json:"min_idle_conns" yaml:"min_idle_conns"` // 最小的 空闲 连接数数量
	// Connection age at which client retires (closes) the connection.
	// Default is to not close aged connections.
	MaxConnAge int64 `json:"max_conn_age" yaml:"max_conn_age"` // 连接最大的存活时常
	// Amount of time client waits for connection if all connections
	// are busy before returning an error.
	// Default is ReadTimeout + 1 second.
	PoolTimeout int64 `json:"pool_timeout" yaml:"pool_timeout"` // 连接池无可用连接, 等待的时常, 默认值 ReadTimeout + 1
	// Amount of time after which client closes idle connections.
	// Should be less than server's timeout.
	// Default is 5 minutes. -1 disables idle timeout check.
	IdleTimeout int64 `json:"idle_timeout" yaml:"idle_timeout"` // 空闲链接的超时时间,  默认 5 分钟 -1 金童
	// Frequency of idle checks made by idle connections reaper.
	// Default is 1 minute. -1 disables idle connections reaper,
	// but idle connections are still discarded by the client
	// if IdleTimeout is set.
	IdleCheckFrequency int64 `json:"idle_check_frequency" yaml:"idle_check_frequency"` // 空闲连接检查频率, 默认 1 分钟, -1 禁用, 注意 : 即使禁用，超过 IdleTimeout 时常的连接也不可被读取到
}

// Config2Options 将 自定义的配置文件转为 redis 包需要的配置格式
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:37 2022/6/15
func Config2Options(cfg *Config) *redis.Options {
	option := &redis.Options{
		Network:            cfg.Network,
		Addr:               fmt.Sprintf("%v:%v", cfg.Host, cfg.Port),
		Username:           cfg.Username,
		Password:           cfg.Password,
		DB:                 cfg.DB,
		MaxRetries:         cfg.MaxRetries,
		MinRetryBackoff:    time.Duration(cfg.MinRetryBackoff) * time.Millisecond,
		MaxRetryBackoff:    time.Duration(cfg.MaxRetryBackoff) * time.Millisecond,
		DialTimeout:        time.Duration(cfg.DialTimeout) * time.Millisecond,
		ReadTimeout:        time.Duration(cfg.ReadTimeout) * time.Millisecond,
		WriteTimeout:       time.Duration(cfg.WriteTimeout) * time.Millisecond,
		PoolFIFO:           cfg.PoolFIFO,
		PoolSize:           cfg.PoolSize,
		MinIdleConns:       cfg.MinIdleConns,
		MaxConnAge:         time.Duration(cfg.MaxConnAge) * time.Millisecond,
		PoolTimeout:        time.Duration(cfg.PoolTimeout) * time.Millisecond,
		IdleTimeout:        time.Duration(cfg.IdleTimeout) * time.Millisecond,
		IdleCheckFrequency: time.Duration(cfg.IdleCheckFrequency) * time.Millisecond,
		TLSConfig:          nil,
		Limiter:            nil,
	}
	if len(option.Network) == 0 {
		option.Network = NetworkTypeTCP
	}
	return option
}

const (
	// NetworkTypeTCP ...
	NetworkTypeTCP = "tcp"
	// NetworkTypeUnix ...
	NetworkTypeUnix = "unix"
)