package input_parser

import (
	"bbash/environment"
	"bufio"
	"fmt"
	"strings"
)

func Escape_handler(reader *bufio.Reader, history_index int, input string, env environment.Env, cursor int) (string, int, int) {
	next_rune, _, _ := reader.ReadRune()
	if next_rune == 59 {
	}
	if next_rune != 91 { // not "["
		return "", history_index, cursor
	}
	next_rune, _, _ = reader.ReadRune()

	switch next_rune {
	case 65: //A
		if history_index > 0 {
			history_index--
			input = env.History[history_index]
			cursor = len(input)
		}
	case 66: //B
		if history_index < len(env.History)-1 {
			history_index++
			input = env.History[history_index]
		}
		if history_index == len(env.History)-1 {
			input = ""
			cursor = 0
		}
		cursor = len(input)
	case 68: //D
		if cursor > 0 {
			cursor--
		}

	case 67: //C
		if prevGhostString != "" {
			input = input + prevGhostString
			cursor = len(input)
		}
		if cursor < len(input) {
			cursor++
		}
	case 49:
		cursor = ctrl(reader, input, cursor)
		return input, history_index, cursor

	}


	return input, history_index, cursor
}
func ctrl(reader *bufio.Reader, input string, cursor int) int {
	next_rune, _, err := reader.ReadRune()
	if err != nil {
		fmt.Println(err.Error())
		return cursor
	}
	if next_rune != 59 {
		return cursor
	}
	next_rune, _, err = reader.ReadRune()
	if err != nil {
		fmt.Println(err.Error())
		return cursor
	}
	if next_rune != 53 {
		return cursor
	}
	next_rune, _, err = reader.ReadRune()
	if err != nil {
		fmt.Println(err.Error())
		return cursor
	}
	switch next_rune {
	case 68: // ctrl left
		input_at := input[:cursor]
		last_index := strings.LastIndex(input_at, " ")
		if last_index == -1 {
			cursor = 0
		} else {
			input_at = input_at[:last_index]
			cursor = len(input_at)
		}
	case 67: // ctrl right
		input_next := input[cursor:]
		next_trimmed := strings.TrimLeft(input_next, " ")
		last_index := strings.Index(next_trimmed, " ")
		if last_index == -1 {
			cursor = len(input)
		} else {
			cursor = cursor + last_index + (len(input_next) - len(next_trimmed))
		}
	}
	return cursor
	


}