package fhelp

// for use with Alex Flint's go-args package

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

	"go.wit.com/lib/gui/shell"
)

// makes a bash autocomplete file for your command
func DoBash(argname string) {
	if homeDir, err := os.UserHomeDir(); err == nil {
		filename := filepath.Join(homeDir, ".local/share/bash-completion/completions", argname)
		if shell.Exists(filename) {
		} else {
			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()
			}
			fmt.Println("bash file created:", filename)
		}
	}

	fmt.Println(MakeBashCompletionText(argname))

	fmt.Println("restart bash")
	os.Exit(0)
}

func MakeBashCompletionText(argname string) string {
	var out string

	out += fmt.Sprintf("# add this in your bashrc:\n")
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("# todo: add this to go-arg as a 'hidden' go-arg option --bash\n")
	out += fmt.Sprintf("#\n")
	out += fmt.Sprintf("# Put the below in the file: ~/.local/share/bash-completion/completions/%s\n", argname)
	out += fmt.Sprintf("#\n")
	out += fmt.Sprintf("# todo: make this output work/parse with:\n")
	out += fmt.Sprintf("# complete -C %s --bash go\n", argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("_%s_complete()\n", argname)
	out += fmt.Sprintf("{\n")
	out += fmt.Sprintf("	# sets local to this func vars\n")
	out += fmt.Sprintf("	local cur prev all\n")
	out += fmt.Sprintf("	cur=${COMP_WORDS[COMP_CWORD]}\n")
	out += fmt.Sprintf("	prev=${COMP_WORDS[COMP_CWORD-1]}\n")
	out += fmt.Sprintf("	all=${COMP_WORDS[@]}\n")
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("	# this is where we generate the go-arg output\n")
	out += fmt.Sprintf("        GOARGS=$(%s --auto-complete $prev \\'$cur\\' $all)\n", argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("	# this compares the command line input from the user\n")
	out += fmt.Sprintf("	# to whatever strings we output\n")
	out += fmt.Sprintf("        COMPREPLY=( $(compgen -W \"$GOARGS\" -- $cur) )  # THIS WORKS\n")
	out += fmt.Sprintf("	return 0\n")
	out += fmt.Sprintf("}\n")
	out += fmt.Sprintf("complete -F _%s_complete %s\n", argname, argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("# copy and paste the above into your bash shell should work\n")
	return out
}

/*
// prints help to STDERR // TODO: move everything below this to go-args
func (args) doBashHelp() {
	if argv.BashAuto[1] != "''" {
		// if this is not blank, then the user has typed something
		return
	}
	if argv.BashAuto[0] != ARGNAME {
		// if this is not the name of the command, the user already started doing something
		return
	}
	if argv.BashAuto[0] == ARGNAME {
		me.pp.WriteHelp(os.Stderr)
		return
	}
	fmt.Fprintln(os.Stderr, "")
	fmt.Fprintln(os.Stderr, "hello world")
	fmt.Fprintln(os.Stderr, "")
}
*/