package config

import (
	"encoding/base64"
	"fmt"
	"strings"

	"github.com/mimecast/dtail/internal/omode"

	gossh "golang.org/x/crypto/ssh"
)

// Args is a helper struct to summarize common client arguments.
type Args struct {
	Arguments          []string
	ConfigFile         string
	ConnectionsPerCPU  int
	Discovery          string
	LogDir             string
	LogLevel           string
	Mode               omode.Mode
	NoColor            bool
	PrivateKeyPathFile string
	Quiet              bool
	RegexInvert        bool
	RegexStr           string
	Serverless         bool
	ServersStr         string
	Spartan            bool
	SSHAuthMethods     []gossh.AuthMethod
	SSHHostKeyCallback gossh.HostKeyCallback
	SSHPort            int
	Timeout            int
	TrustAllHosts      bool
	UserName           string
	What               string
}

func (a *Args) String() string {
	var sb strings.Builder

	sb.WriteString("Args(")

	sb.WriteString(fmt.Sprintf("%s:%s,", "LogDir", a.LogDir))
	sb.WriteString(fmt.Sprintf("%s:%s,", "LogLevel", a.LogLevel))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Arguments", a.Arguments))
	sb.WriteString(fmt.Sprintf("%s:%v,", "ConfigFile", a.ConfigFile))
	sb.WriteString(fmt.Sprintf("%s:%v,", "ConnectionsPerCPU", a.ConnectionsPerCPU))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Discovery", a.Discovery))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Mode", a.Mode))
	sb.WriteString(fmt.Sprintf("%s:%v,", "NoColor", a.NoColor))
	sb.WriteString(fmt.Sprintf("%s:%v,", "PrivateKeyPathFile", a.PrivateKeyPathFile))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Quiet", a.Quiet))
	sb.WriteString(fmt.Sprintf("%s:%v,", "RegexInvert", a.RegexInvert))
	sb.WriteString(fmt.Sprintf("%s:%v,", "RegexStr", a.RegexStr))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Serverless", a.Serverless))
	sb.WriteString(fmt.Sprintf("%s:%v,", "ServersStr", a.ServersStr))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Spartan", a.Spartan))
	sb.WriteString(fmt.Sprintf("%s:%v,", "SSHAuthMethods", a.SSHAuthMethods))
	sb.WriteString(fmt.Sprintf("%s:%v,", "SSHHostKeyCallback", a.SSHHostKeyCallback))
	sb.WriteString(fmt.Sprintf("%s:%v,", "SSHPort", a.SSHPort))
	sb.WriteString(fmt.Sprintf("%s:%v,", "Timeout", a.Timeout))
	sb.WriteString(fmt.Sprintf("%s:%v,", "TrustAllHosts", a.TrustAllHosts))
	sb.WriteString(fmt.Sprintf("%s:%v,", "UserName", a.UserName))
	sb.WriteString(fmt.Sprintf("%s:%v", "What", a.What))
	sb.WriteString(")")

	return sb.String()
}

// SerializeOptions returns a string ready to be sent over the wire to the server.
func (a *Args) SerializeOptions() string {
	return fmt.Sprintf("quiet=%v:spartan=%v:serverless=%v", a.Quiet, a.Spartan, a.Serverless)
}

// DeserializeOptions deserializes the options, but into a map.
func DeserializeOptions(opts []string) (map[string]string, error) {
	options := make(map[string]string, len(opts))

	for _, o := range opts {
		kv := strings.SplitN(o, "=", 2)
		if len(kv) != 2 {
			return options, fmt.Errorf("Unable to parse options: %v", kv)
		}
		key := kv[0]
		val := kv[1]

		if strings.HasPrefix(val, "base64%") {
			s := strings.SplitN(val, "%", 2)
			decoded, err := base64.StdEncoding.DecodeString(s[1])
			if err != nil {
				return options, err
			}
			val = string(decoded)
		}

		options[key] = val
	}

	return options, nil
}