// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  code.go
//   Created by DEV
//   Modified   06/04/2024
//
//   Copyright 2024 activething.com 
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

package ansi

import "strings"
/*
const (

	ColorNone Code = iota
	ColorBlack
	ColorRed
	ColorGreen
	ColorYellow
	ColorBlue
	ColorMagenta
	ColorCyan
	ColorWhite
	ColorHBlack
	ColorHRed
	ColorHGreen
	ColorHYellow
	ColorHBlue
	ColorHMagenta
	ColorHCyan
	ColorHWhite
	ColorDefault

 
)

 */

const (

	TextBoldOn Code = 1024 << iota
	TextUnderlineOn
	TextBlinkOn
	TextBoldOff
	TextUnderlineOff
	TextBlinkOff

	//bgMask  Code = 0b0000000000011111
	bgMask  Code = 0b1111110000011111
	fgMask  Code = 0b1111111111100000
	clMask  Code = 0b0000001111111111
	txMask  Code = 0b1111110000000000
	bgShift int  = 5
)


type (

	Code uint16
)


func (c Code) Atts () string {
	if c == 0 {
		return ""
	}
	var r []string
	m := c & txMask
	if m != 0 {
		dc := TextBoldOn
		for i:=0; i<6; i++ {
			if m & dc != 0 {
				r = append(r,string(g.itx[i].name))
			}
			dc <<= 1
		}
	}
	r = append(r,strings.Join([]string{c.FgColorName(),c.BgColorName()},":"))
	return strings.Join(r,";")
}



func (c Code) Clear () Code {
	return 0 }

func (c Code) ClearColor () Code {
	return c & txMask }

func (c Code) ClearText  () Code {
	return c & clMask }


func (c Code) FgColor() Code {
	return (c & clMask) & bgMask }

func (c Code) SetFgColor(color Code) Code {
	return (c & fgMask) | color& bgMask }

func (c Code) FgColorName () string {
	return string(g.ics[(c & clMask) & bgMask].name) }


func (c Code) BgColor() Code {
	return ((c & clMask) & fgMask) >> bgShift }

func (c Code) SetBgColor(color Code) Code {
	return (c & bgMask) | (color<< bgShift) & fgMask }

func (c Code) BgColorName () string {
	return string(g.ics[((c & clMask) & fgMask) >> bgShift].name) }



func (c Code) SetColors(fg, bg Code) Code {
	return c.SetFgColor(fg).SetBgColor(bg) }





func (c Code) IsBoldOn () bool {
	return c & TextBoldOn != 0 }

func (c Code) IsBoldOff() bool {
	return c & TextBoldOff != 0 }

func (c Code) IsBlinkOn() bool {
	return c & TextBlinkOn != 0 }

func (c Code) IsBlinkOff() bool {
	return c & TextBlinkOff != 0 }

func (c Code) IsUnderlineOn () bool {
	return c & TextUnderlineOn != 0 }

func (c Code) IsUnderlineOff() bool {
	return c & TextUnderlineOff != 0 }

func (c Code) SetBold (on bool) Code {
	if on {
		return (c &^ TextBoldOff) | TextBoldOn
	}
	return (c &^ TextBoldOn) | TextBoldOff
}

func (c Code) SetBlink (on bool) Code {
	if on {
		return (c &^ TextBlinkOff) | TextBlinkOn
	}
	return (c &^ TextBlinkOn) | TextBlinkOff
}

func (c Code) SetUnderline (on bool) Code {
	if on {
		return (c &^ TextUnderlineOff) | TextUnderlineOn
	}
	return (c &^ TextUnderlineOn) | TextUnderlineOff
}



func (c Code) scapeText () []byte {
	m := c & txMask
	if m == 0 {
		return nil
	}
	var r []byte
	dc := TextBoldOn
	for i:=0; i<6; i++ {
		if m & dc != 0 {
			if r != nil {
				r = append(r,';')
			}
			r = append(r, g.itx[i].esc...)
		}
		dc <<= 1
	}
	return r
}


func (c Code) scapeColor () []byte {
	m := c & clMask
	if m == 0 {
		return nil
	}
	var r []byte
	f := m & bgMask
	b := (m & fgMask) >> bgShift
	if f != 0 {
		r = append(r, g.ics[f].fgEsc...)
	}
	if b != 0 {
		if f > 0 {
			r=append(r,';')
		}
		r = append(r, g.ics[b].bgEsc...)
	}
	return r
}


func (c Code) escape () []byte {
	if c == 0 {
		return []byte{'0'}
	}
	st := c.scapeText ()
	sc := c.scapeColor()
	if len(sc) == 0 {
		return st
	}
	if len(st) == 0 {
		return sc
	}
	return append(st,append([]byte{';'},sc...)...)
}


func (c Code) Escape() string {
	if c == 0 {
		return ""
	}
	r := c.escape()
	return string(append(g.beginEscIni, append(r, g.beginEscEnd...)...))
}