// Copyright © 2017 Mikael Berthe <mikael@lilotux.net>

//

// Licensed under the MIT license.

// Please see the LICENSE file is this directory.

package cmd

import (

	"fmt"

	"io/ioutil"

	"os"

	"github.com/pkg/errors"

	"github.com/spf13/cobra"

	"github.com/spf13/viper"

	"github.com/McKael/madon"

	"github.com/McKael/madonctl/printer"

)

// AppName is the CLI application name

const AppName = "madonctl"

const defaultConfigFile = "$HOME/.config/" + AppName + "/" + AppName + ".yaml"

var cfgFile string

var safeMode bool

var instanceURL, appID, appSecret string

var login, password, token string

var gClient *madon.Client

var verbose bool

var outputFormat string

var outputTemplate, outputTemplateFile string

// Shell completion functions

const shellComplFunc = `

__madonctl_visibility() {

	COMPREPLY=( direct private unlisted public )

}

__madonctl_output() {

	COMPREPLY=( plain json yaml template )

}

`

// RootCmd represents the base command when called without any subcommands

var RootCmd = &cobra.Command{

	Use:               AppName,

	Short:             "A CLI utility for Mastodon API",

	PersistentPreRunE: checkOutputFormat,

	Long: `madonctl is a CLI tool for the Mastodon REST API.

You can use a configuration file to store common options.

For example, create ` + defaultConfigFile + ` with the following

contents:

	---

	instance: "INSTANCE"

	login: "USERNAME"

	password: "USERPASSWORD"

	...

The simplest way to generate a configuration file is to use the 'config dump'

command.

(Configuration files in JSON are also accepted.)

If you want shell auto-completion (for bash or zsh), you can generate the

completion scripts with "madonctl completion $SHELL".

For example if you use bash:

	madonctl completion bash > _bash_madonctl

	source _bash_madonctl

Now you should have tab completion for subcommands and flags.

Note: Most examples assume the user's credentials are set in the configuration

file.

`,

	Example: `  madonctl instance

  madonctl toot "Hello, World"

  madonctl toot --visibility direct "@McKael Hello, You"

  madonctl toot --visibility private --spoiler CW "The answer was 42"

  madonctl post --file image.jpg Selfie

  madonctl --instance INSTANCE --login USERNAME --password PASS timeline

  madonctl accounts notifications --list --clear

  madonctl accounts blocked

  madonctl accounts search Gargron

  madonctl search --resolve https://mastodon.social/@Gargron

  madonctl accounts follow --remote Gargron@mastodon.social

  madonctl accounts --account-id 399 statuses

  madonctl status --status-id 416671 show

  madonctl status --status-id 416671 favourite

  madonctl status --status-id 416671 boost

  madonctl accounts show

  madonctl accounts show -o yaml

  madonctl accounts --account-id 1 followers --template '{{.acct}}{{"\n"}}'

  madonctl config whoami

  madonctl timeline :mastodon`,

	BashCompletionFunction: shellComplFunc,

}

// 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 {

		errPrint("Error: %s", err.Error())

		os.Exit(-1)

	}

}

func init() {

	cobra.OnInitialize(initConfig)

	// Global flags

	RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "",

		"config file (default is "+defaultConfigFile+")")

	RootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "Verbose mode")

	RootCmd.PersistentFlags().StringVarP(&instanceURL, "instance", "i", "", "Mastodon instance")

	RootCmd.PersistentFlags().StringVarP(&login, "login", "L", "", "Instance user login")

	RootCmd.PersistentFlags().StringVarP(&password, "password", "P", "", "Instance user password")

	RootCmd.PersistentFlags().StringVarP(&token, "token", "t", "", "User token")

	RootCmd.PersistentFlags().StringVarP(&outputFormat, "output", "o", "plain",

		"Output format (plain|json|yaml|template)")

	RootCmd.PersistentFlags().StringVar(&outputTemplate, "template", "",

		"Go template (for output=template)")

	RootCmd.PersistentFlags().StringVar(&outputTemplateFile, "template-file", "",

		"Go template file (for output=template)")

	// Configuration file bindings

	viper.BindPFlag("output", RootCmd.PersistentFlags().Lookup("output"))

	viper.BindPFlag("verbose", RootCmd.PersistentFlags().Lookup("verbose"))

	// XXX viper.BindPFlag("apiKey", RootCmd.PersistentFlags().Lookup("api-key"))

	viper.BindPFlag("instance", RootCmd.PersistentFlags().Lookup("instance"))

	viper.BindPFlag("login", RootCmd.PersistentFlags().Lookup("login"))

	viper.BindPFlag("password", RootCmd.PersistentFlags().Lookup("password"))

	viper.BindPFlag("token", RootCmd.PersistentFlags().Lookup("token"))

	// Flag completion

}

func checkOutputFormat(cmd *cobra.Command, args []string) error {

	of := viper.GetString("output")

	switch of {

	case "", "plain", "json", "yaml", "template":

		return nil // Accepted

	}

	return errors.Errorf("output format '%s' not supported", of)

}

// 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)

	}

	viper.SetConfigName(AppName) // name of config file (without extension)

	viper.AddConfigPath("$HOME/.config/" + AppName)

	viper.AddConfigPath("$HOME/." + AppName)

	// Read in environment variables that match, with a prefix

	viper.SetEnvPrefix(AppName)

	viper.AutomaticEnv()

	// If a config file is found, read it in.

	if err := viper.ReadInConfig(); viper.GetBool("verbose") && err == nil {

		errPrint("Using config file: %s", viper.ConfigFileUsed())

	}

}

// getOutputFormat return the requested output format, defaulting to "plain".

func getOutputFormat() string {

	of := viper.GetString("output")

	if of == "" {

		of = "plain"

	}

	// Override format if a template is provided

	if of == "plain" && (outputTemplate != "" || outputTemplateFile != "") {

		// If the format is plain and there is a template option,

		// set the format to "template".

		of = "template"

	}

	return of

}

// getPrinter returns a resource printer for the requested output format.

func getPrinter() (printer.ResourcePrinter, error) {

	var opt string

	of := getOutputFormat()

	if of == "template" {

		opt = outputTemplate

		if outputTemplateFile != "" {

			tmpl, err := ioutil.ReadFile(outputTemplateFile)

			if err != nil {

				return nil, err

			}

			opt = string(tmpl)

		}

	}

	return printer.NewPrinter(of, opt)

}

func errPrint(format string, a ...interface{}) (n int, err error) {

	return fmt.Fprintf(os.Stderr, format+"\n", a...)

}