// Copyright 2018 Caicloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package command

import (
	"log"
	"os"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var cfgFile string

// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
	Use:   "kubeflow-kernel",
	Short: "Kernel for Kubeflow in Jupyter",
	Long:  ``,
}

// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	if err := RootCmd.Execute(); err != nil {
		log.Println(err)
		os.Exit(-1)
	}
}

func init() {
	cobra.OnInitialize(initConfig)

	RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.ciao/config.yaml)")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	if cfgFile != "" { // enable ability to specify config file via flag
		viper.SetConfigFile(cfgFile)
	} else {
		viper.SetConfigName("config")      // name of config file (without extension)
		viper.AddConfigPath("$HOME/.ciao") // adding home directory as first search path
		viper.AddConfigPath(".")           // look for config in the working directory
		viper.AddConfigPath("/etc/ciao/")
	}

	// If a config file is found, read it in.
	err := viper.ReadInConfig()
	if err != nil {
		log.Fatalf("Failed to read the config: %v", err)
	} else {
		log.Println("Using config file:", viper.ConfigFileUsed())
	}
}
