package client

import (
	"fmt"
	"os"
	"runtime"
	"strings"

	Cli "github.com/hyperhq/hypercli/cli"
	"github.com/hyperhq/hypercli/cliconfig"
	flag "github.com/hyperhq/hypercli/pkg/mflag"
)

// CmdConfig
//
// Usage: hyper config
func (cli *DockerCli) CmdConfig(args ...string) error {
	cmd := Cli.Subcmd("config", []string{"[REGION]"}, Cli.DockerCommands["config"].Description+".\nIf no region is specified, the default is defined as "+cliconfig.DefaultHyperRegion, true)
	cmd.Require(flag.Max, 1)

	flAccesskey := cmd.String([]string{"-accesskey"}, "", "Access Key")
	flSecretkey := cmd.String([]string{"-secretkey"}, "", "Secret Key")
	flDefaultRegion := cmd.String([]string{"-default-region"}, "", "Default Region Endpoint")

	cmd.ParseFlags(args, true)

	// On Windows, force the use of the regular OS stdin stream. Fixes #14336/#14210
	if runtime.GOOS == "windows" {
		cli.in = os.Stdin
	}

	var serverAddress string
	if len(cmd.Args()) > 0 {
		serverAddress = cmd.Arg(0)
	} else {
		serverAddress = cliconfig.DefaultHyperFormat
	}

	_, err := cli.configureCloud(serverAddress, *flDefaultRegion, *flAccesskey, *flSecretkey)
	if err != nil {
		return err
	}

	if err := cli.configFile.Save(); err != nil {
		return fmt.Errorf("Error saving config file: %v", err)
	}
	fmt.Fprintf(cli.out, "WARNING: Your login credentials has been saved in %s\n", cli.configFile.Filename())

	return nil
}

func (cli *DockerCli) configureCloud(serverAddress, flRegion, flAccesskey, flSecretkey string) (cliconfig.CloudConfig, error) {
	cloudConfig := cliconfig.CloudConfig{}
	if serverAddress != "" {
		if cc, ok := cli.configFile.CloudConfig[serverAddress]; ok {
			cloudConfig = cc
		} else {
			// for legacy format
			defaultHost := "tcp://" + cliconfig.DefaultHyperRegion + "." + cliconfig.DefaultHyperEndpoint
			cloudConfig, ok = cli.configFile.CloudConfig[defaultHost]
			if ok {
				delete(cli.configFile.CloudConfig, defaultHost)
			}
		}
	}

	defaultRegion := cli.getDefaultRegion()
	if cloudConfig.Region != "" {
		defaultRegion = cloudConfig.Region
	}
	if flAccesskey = strings.TrimSpace(flAccesskey); flAccesskey == "" {
		cli.promptWithDefault("Enter Access Key", cloudConfig.AccessKey)
		flAccesskey = readInput(cli.in, cli.out)
		flAccesskey = strings.TrimSpace(flAccesskey)
		if flAccesskey == "" {
			flAccesskey = cloudConfig.AccessKey
		}
	}
	if flSecretkey = strings.TrimSpace(flSecretkey); flSecretkey == "" {
		cli.promptWithDefault("Enter Secret Key", cloudConfig.SecretKey)
		flSecretkey = readInput(cli.in, cli.out)
		flSecretkey = strings.TrimSpace(flSecretkey)
		if flSecretkey == "" {
			flSecretkey = cloudConfig.SecretKey
		}
	}
	if flRegion = strings.TrimSpace(flRegion); flRegion == "" {
		cli.promptWithDefault("Enter Default Region", defaultRegion)
		flRegion = readInput(cli.in, cli.out)
		flRegion = strings.TrimSpace(flRegion)
		if flRegion == "" {
			flRegion = defaultRegion
		}
	}

	cloudConfig.AccessKey = flAccesskey
	cloudConfig.SecretKey = flSecretkey
	cloudConfig.Region = flRegion
	if serverAddress != "" {
		cli.configFile.CloudConfig[serverAddress] = cloudConfig
	}

	return cloudConfig, nil
}

func (cli *DockerCli) checkCloudConfig() error {
	_, ok := cli.configFile.CloudConfig[cli.host]
	if !ok {
		_, ok = cli.configFile.CloudConfig[cliconfig.DefaultHyperFormat]
		if !ok {
			return fmt.Errorf("Config info for the host is not found, please run 'hyper config %s' first.", cli.host)
		}
	}
	return nil
}

func (cli *DockerCli) getDefaultRegion() string {
	cc, ok := cli.configFile.CloudConfig[cliconfig.DefaultHyperFormat]
	if ok && cc.Region != "" {
		return cc.Region
	}
	return cliconfig.DefaultHyperRegion
}