package prep

// initializes logging and command line options

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"go.wit.com/dev/alexflint/arg"
	"go.wit.com/lib/gui/shell"
	"go.wit.com/log"
)

/*
This struct can be used with the go-arg package. These
are the generic default command line arguments for the 'GUI' package
*/
var argBash ArgsBash

type ArgsBash struct {
	Bash bool `arg:"--bash"                               help:"generate bash completion"`
}

// try this struct out (?)
var myAuto *AutoArgs

// this is a work in progress
type AutoArgs struct {
	id       int               // should be unique
	hidden   bool              // don't update the toolkits when it's hidden
	Auto     func([]string)    // the function for shell autocomplete
	appName  string            // a good way to track the name of the binary ?
	pp       *arg.Parser       // for parsing the command line args.  Yay to alexf lint!
	autoFunc func(*Auto)       // also a function for autocomplete
	match    map[string]string // maps for strings
}

// argname is the name of the executable
func Bash(argname string, autocomplete func([]string)) *AutoArgs {
	myAuto = new(AutoArgs)
	myAuto.appName = argname

	if len(os.Args) > 1 && os.Args[1] == "--bash" {
		doBash(argname)
		os.Exit(0)
	}

	if len(os.Args) > 1 && os.Args[1] == "--auto-complete" {
		autocomplete(os.Args[2:])
		os.Exit(0)
	}

	arg.Register(&argBash)

	// parse go.Arg here?
	return myAuto
}

// print out auto complete debugging info
func (pb *Auto) PrintDebug() {
	dur := pb.Duration.AsDuration()
	pb.Debugf("AUTOCOMPLETE: arg0='%s' arg1='%s' partial='%s' cmd='%s' age=%s argv=%v\n", pb.Arg0, pb.Arg1, pb.Partial, pb.Cmd, shell.FormatDuration(dur), pb.Argv)
}

// returns the last command (is blank if the current arg is not blank)
func GetLast(cur string, argv []string) string {
	if cur != "''" {
		return ""
	}
	for _, s := range argv {
		if strings.HasPrefix(s, "-") {
			continue
		}
		return s
	}
	return ""
}

// returns the name of the executable registered for shell autocomplete
func AppName() string {
	return myAuto.appName
}

// makes a bash autocomplete file for your command
func doBash(argname string) {
	fmt.Println(makeBashCompletionText(argname))

	homeDir, err := os.UserHomeDir()
	if err != nil {
		log.Printf("%v\n", err)
		os.Exit(0)
	}
	filename := filepath.Join(homeDir, ".local/share/bash-completion/completions", argname)
	if shell.Exists(filename) {
		log.Println(filename, "file already exists")
		os.Exit(0)
	}
	basedir, _ := filepath.Split(filename)
	if !shell.IsDir(basedir) {
		os.MkdirAll(basedir, os.ModePerm)
	}

	if f, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644); err == nil {
		f.Write([]byte(makeBashCompletionText(argname)))
		f.Close()
		log.Println("bash file created:", filename)
		log.Println("restart bash")
	} else {
		log.Info(filename, err)
	}
	os.Exit(0)
}