// Copyright 2021 Northern.tech AS
//
//    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 cmd

import (
	"fmt"
	"os"

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

	"github.com/mendersoftware/mender-cli/log"
)

var Version string

const (
	argRootServer     = "server"
	argRootSkipVerify = "skip-verify"
	argRootToken      = "token"
	argRootVerbose    = "verbose"
	argRootGenerate   = "generate-autocomplete"
	argRootVersion    = "version"
)

func init() {
	viper.SetConfigName(".mender-clirc")
	viper.SetConfigType("json")
	viper.AddConfigPath("/etc/mender-cli/")
	viper.AddConfigPath("$HOME/")
	viper.AddConfigPath(".")
	if err := viper.ReadInConfig(); err != nil {
		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
			log.Info(fmt.Sprintf("Failed to read config: %s", err))
			os.Exit(1)
		} else {
			log.Info("Configuration file not found. Continuing.")
		}
	} else {
		fmt.Fprintf(os.Stderr, "Using configuration file: %s\n", viper.ConfigFileUsed())
	}
}

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:   "mender-cli",
	Short: "A general-purpose CLI for the Mender server.",

	//setup global stuff, will run regardless of (sub)command
	PersistentPreRun: func(cmd *cobra.Command, args []string) {
		verbose, err := cmd.Flags().GetBool(argRootVerbose)
		CheckErr(err)
		log.Setup(verbose)
		if verbose {
			log.Verb(fmt.Sprintf("verbose output is ON"))
		}
	},
	ValidArgs: []string{"artifacts", "help", "login"},
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	rootCmd.LocalFlags().Parse(os.Args)
	b, _ := rootCmd.Flags().GetBool(argRootGenerate)
	if b {
		err := rootCmd.GenBashCompletionFile("./autocomplete/autocomplete.sh")
		if err != nil {
			log.Errf("Failed to generate the Bash autocompletion scripts: %s\n", err)
		}
		err = rootCmd.GenZshCompletionFile("./autocomplete/autocomplete.zsh")
		if err != nil {
			log.Errf("Failed to generate the Zsh autocompletion scripts: %s\n", err)
		}
		return
	}
	version, err := rootCmd.Flags().GetBool(argRootVersion)
	CheckErr(err)
	if version {
		fmt.Printf("mender-cli version %s\n", Version)
		os.Exit(0)
	}
	CheckErr(rootCmd.Execute())
}

func init() {
	// Here you will define your flags and configuration settings.
	// Cobra supports persistent flags, which, if defined here,
	// will be global for your application.
	rootCmd.PersistentFlags().StringP(argRootServer, "", "https://hosted.mender.io", "root server URL, e.g. 'https://hosted.mender.io'")
	viper.BindPFlag(argRootServer, rootCmd.PersistentFlags().Lookup(argRootServer))
	rootCmd.PersistentFlags().BoolP(argRootSkipVerify, "k", false, "skip SSL certificate verification")
	rootCmd.PersistentFlags().StringP(argRootToken, "", "", "token file path")
	rootCmd.PersistentFlags().BoolP(argRootVerbose, "v", false, "print verbose output")
	rootCmd.Flags().Bool(argRootVersion, false, "print version")
	rootCmd.Flags().Bool(argRootGenerate, false, "generate shell completion script")
	rootCmd.Flags().MarkHidden(argRootGenerate)
	rootCmd.AddCommand(loginCmd)
	rootCmd.AddCommand(artifactsCmd)
	rootCmd.AddCommand(devicesCmd)
	rootCmd.AddCommand(terminalCmd)
	rootCmd.AddCommand(portForwardCmd)
	rootCmd.AddCommand(fileTransferCmd)
}
