package servercfg

import (
        "github.com/gravitl/netmaker/config"
	"net/http"
	"io/ioutil"
	"os"
	"errors"
)

func SetHost() error {
	remoteip, err := GetPublicIP()
	if err != nil {
		return err
	}
	os.Setenv("SERVER_HOST", remoteip)
	return nil
}
func GetConfig() config.ServerConfig {
	var cfg config.ServerConfig
	cfg.APIHost = GetAPIHost()
	cfg.APIPort = GetAPIPort()
	cfg.GRPCHost = GetGRPCHost()
	cfg.GRPCPort = GetGRPCPort()
	cfg.MasterKey = "(hidden)"
	cfg.AllowedOrigin = GetAllowedOrigin()
	cfg.RestBackend = "off"
	if IsRestBackend() {
		cfg.RestBackend = "on"
	}
	cfg.AgentBackend = "off"
        if IsAgentBackend() {
                cfg.AgentBackend = "on"
        }
	cfg.ClientMode = "off"
	if IsClientMode() {
		cfg.ClientMode = "on"
	}
	cfg.DNSMode = "off"
	if IsDNSMode() {
	        cfg.DNSMode = "on"
	}
	cfg.DisableRemoteIPCheck = "off"
	if DisableRemoteIPCheck() {
		cfg.DisableRemoteIPCheck = "on"
	}
	return cfg
}

func GetWGConfig() config.WG{
	var cfg config.WG
	if IsGRPCWireGuard() {
		cfg.GRPCWireGuard = "on"
	} else {
                cfg.GRPCWireGuard = "off"
	}
	cfg.GRPCWGInterface = GetGRPCWGInterface()
	cfg.GRPCWGAddress = GetGRPCWGAddress()
	cfg.GRPCWGPort = GetGRPCWGPort()
	cfg.GRPCWGEndpoint = GetGRPCHost()

	return cfg
}

func GetAPIHost() string {
        serverhost := "127.0.0.1"
        if os.Getenv("SERVER_HTTP_HOST") != ""  {
                serverhost = os.Getenv("SERVER_HTTP_HOST")
        } else if config.Config.Server.APIHost != "" {
		serverhost = config.Config.Server.APIHost
        } else if os.Getenv("SERVER_HOST") != ""  {
                serverhost = os.Getenv("SERVER_HOST")
        } else {
                remoteip, _ := GetPublicIP()
                if remoteip != "" {
                        serverhost = remoteip
                }
        }
	return serverhost
}
func GetAPIPort() string {
	apiport := "8081"
	if os.Getenv("API_PORT") != "" {
		apiport = os.Getenv("API_PORT")
	} else if  config.Config.Server.APIPort != "" {
		apiport = config.Config.Server.APIPort
	}
	return apiport
}

func GetGRPCHost() string {
	serverhost := "127.0.0.1"
	if IsGRPCWireGuard() {
		serverhost = GetGRPCWGAddress()
	} else {
		if os.Getenv("SERVER_GRPC_HOST") != ""  {
			serverhost = os.Getenv("SERVER_GRPC_HOST")
		} else if config.Config.Server.GRPCHost != "" {
		       serverhost = config.Config.Server.GRPCHost
		} else if os.Getenv("SERVER_HOST") != ""  {
		       serverhost = os.Getenv("SERVER_HOST")
		} else {
		        remoteip, _ := GetPublicIP()
			if remoteip != "" {
				serverhost = remoteip
			}
		}
	}
        return serverhost
}
func GetGRPCPort() string {
        grpcport := "50051"
	if os.Getenv("GRPC_PORT") != "" {
	        grpcport = os.Getenv("GRPC_PORT")
	} else if  config.Config.Server.GRPCPort != "" {
	        grpcport = config.Config.Server.GRPCPort
	}
        return grpcport
}
func GetMasterKey() string {
        key := "secretkey"
        if os.Getenv("MASTER_KEY") != "" {
                key = os.Getenv("MASTER_KEY")
        } else if  config.Config.Server.MasterKey != "" {
                key = config.Config.Server.MasterKey
        }
        return key
}
func GetAllowedOrigin() string {
        allowedorigin := "*"
        if os.Getenv("CORS_ALLOWED_ORIGIN") != "" {
                allowedorigin = os.Getenv("CORS_ALLOWED_ORIGIN")
        } else if  config.Config.Server.AllowedOrigin != "" {
                allowedorigin = config.Config.Server.AllowedOrigin
        }
        return allowedorigin
}
func IsRestBackend() bool {
        isrest := true
        if os.Getenv("REST_BACKEND") != "" {
		if os.Getenv("REST_BACKEND") == "off" {
			isrest = false
		}
	} else if config.Config.Server.RestBackend != "" {
		if config.Config.Server.RestBackend == "off" {
			isrest = false
		}
       }
       return isrest
}
func IsAgentBackend() bool {
        isagent := true
        if os.Getenv("AGENT_BACKEND") != "" {
                if os.Getenv("AGENT_BACKEND") == "off" {
                        isagent = false
                }
        } else if config.Config.Server.AgentBackend != "" {
                if config.Config.Server.AgentBackend == "off" {
                        isagent = false
                }
       }
       return isagent
}
func IsClientMode() bool {
        isclient := true
        if os.Getenv("CLIENT_MODE") != "" {
                if os.Getenv("CLIENT_MODE") == "off" {
                        isclient = false
                }
        } else if config.Config.Server.ClientMode != "" {
                if config.Config.Server.ClientMode == "off" {
                        isclient = false
                }
       }
       return isclient
}
func IsDNSMode() bool {
        isdns := true
        if os.Getenv("DNS_MODE") != "" {
                if os.Getenv("DNS_MODE") == "off" {
                        isdns = false
                }
        } else if config.Config.Server.DNSMode != "" {
                if config.Config.Server.DNSMode == "off" {
                        isdns = false
                }
       }
       return isdns
}
func DisableRemoteIPCheck() bool {
        disabled := false
        if os.Getenv("DISABLE_REMOTE_IP_CHECK") != "" {
                if os.Getenv("DISABLE_REMOTE_IP_CHECK") == "on" {
                        disabled = true
                }
        } else if config.Config.Server.DisableRemoteIPCheck != "" {
                if config.Config.Server.DisableRemoteIPCheck == "on" {
                        disabled= true
                }
       }
       return disabled
}
func GetPublicIP() (string, error) {

        endpoint := ""
        var err error

        iplist := []string{"http://ip.server.gravitl.com", "https://ifconfig.me", "http://api.ipify.org", "http://ipinfo.io/ip"}
        for _, ipserver := range iplist {
                resp, err := http.Get(ipserver)
                if err != nil {
                        continue
                }
                defer resp.Body.Close()
                if resp.StatusCode == http.StatusOK {
                        bodyBytes, err := ioutil.ReadAll(resp.Body)
                        if err != nil {
                                continue
                        }
                        endpoint = string(bodyBytes)
                        break
                }

        }
        if err == nil && endpoint == "" {
                err =  errors.New("Public Address Not Found.")
        }
        return endpoint, err
}