package tmpl

import (
	"bufio"
	"fmt"
	"io"

	//"log"
	"os"

	"surdeus.su/core/cli/mtool"
)

var (
	delim = '\n'
	Tool  = mtool.T("tmpl").Func(Run).Desc(
		"substitute the inputted runes with the specified words",
	).Usage(
		"[n_strings]",
	)
)

func Run(flags *mtool.Flags) {
	cargs := flags.CustomArgs()
	if len(cargs) == 0 {
		CustomRun(os.Stdin, os.Stdout, flags)
		return
	}

	input := cargs[0].(io.Reader)
	output := cargs[1].(io.Writer)
	CustomRun(input, output, flags)
}

func CustomRun(
	input io.Reader,
	output io.Writer,
	flags *mtool.Flags,
) {

	var (
		charsString string
		chrs        []rune
		skip        bool
	)

	flags.StringVar(
		&charsString,
		"c",
		"0123456789",
		"character set for substitution",
		"COMBO_CHARS",
	)

	flags.BoolVar(
		&skip,
		"skip",
		false,
		"skip and do not substitute not fitting chars",
	)

	args := flags.Parse()

	/*if len(args)<2 || len(args[0]) != len(args)-1 {
		flags.Usage()
		os.Exit(1)
	}*/

	chrs = []rune(charsString)
	//args = args[1:]

	tmpl := make(map[rune]string)
	for i, s := range args {
		tmpl[rune(chrs[i])] = s
	}

	r := bufio.NewReader(input)
	for {
		s, e := r.ReadString(byte(delim))
		if e == io.EOF {
			break
		}
		s = s[:len(s)-1]
		for _, c := range s {
			s, ok := tmpl[c]
			if !skip && !ok {
				s = string(c)
			}
			fmt.Printf("%s", s)
		}
		fmt.Fprintf(output, "%s", string(delim))
	}
}