package banner

import (
	"encoding/base64"
	"fmt"
	"os"
	"strings"
)

const plainBanner = `
u***mo**oomqmmo**o**oo**o******mmmoooom*u*nnn
xxxzxxxzznuuuunxz*nrjjvvrznnzrrxzzzzzzxjjxrrj
jvvvtvvtttttjjtvtftxumqm*nrtfttjrrjrjjvttcfvt
cifc|cccc||ii|i/fdEEUKHB&MAY*|itvjtfccc|i/|ii
\\((\//\))\/()}vT*i}\vqUH%@@%E|\|||/\\)((/|//
}({][][[}{}{{?jQc,,,-:]xVKW%@@S\|/\){{)}[}(((
fvt{[{{?]]!!1cAY?<^~~?{\jIX%%%@Vm*xfc|}]]??{/
Coou*oqur}1!?JXZrotlmuuICpD%%%@KPFbpdm/!?l!(f
bbqCCTVTTpoCoP#T!{[!j??}{zA#W#@XEEIJLJu}]})\f
PFVVTVTZZYYUQKWD}<l\u]>[zZ&WB&W&RZVTLJd*nuodo
SFEEEEVPPPYSQXMWJ([*Jx/vCRW#&W#WARRSSUZEVJLEP
UYPEZUSUYZZFPDB&ME|!izuJUO#W&##WDPPTVPEFVPFVV
QKREZYYPFTIppGBBW@XELUDOOOXW#W##MYZFVZYZSRZVV
NNUELJJJdpmqdPMM&W#WquJVLdIDW%#W%KUEPVFVICbJT
TFLIIEPFNNNSDAB&&KVz(]{){{\qAODH##MQRTVJj*CpC
PUVITVLPKDXQH#WMT}^"";~;:>?zNNG##&&HRptjx*qqd
EYEdoupEUFGH&WRC{"",,"",:>]mRGQDUVZK&AYIonxvv
FZPPPbpqdD#&#At~,---''-,-:]oLJdpJPGO&##BDUUVo
TCdbbdbED%&BHYIx/)?;:,-,;}zLRDH&W#@@%W&&BGUUZ
VCdbdqE&MXXOSUQGUTIdppmoCRKW%&XQKHMW&W&BBHRYS
RPVFVVQXXBBOKXOANPEZRSSQXW%%BXXOKUUQAB&&BBAZP
m*nnzEHXXBMXXMHMAAOKNNQXW##WBWBKNYDMW#%WHOXGF
ELJTUXMOAHMXBBM&XXXKQAHB%%##WBOHXB%%%#WWXHXAS
RNKHXHADNDXBW#WBBBOKOXWWW####WW@@%##%%#WMMMXO
KOHHOOXOHMMM#W&WWXAOBW#WW%%%##@@@####%%#BBMHA
XOXODSQGNO&@@@@@@#WWWW#%#%%%%@@@%%%%%%@%W&BMM
XBBQEFFZPPEdtczbPDX%@@@%#%%%@@%%%%#%@@%%W&&BM
XBWHQNNDNGb[l??![(/nVRB@@@@@@@%@@@@%@@WWBBBBM
WW%%#BWMHMKZTqji\\/)itfLQKSNAKRRKOB%@%WDM&&BM
W%%%%%@%%OZIxxpqzrvzupJTVLFUUURNGHHB@@%#W#WW&
##%#%%%@#Tp*t(xTFJComJJEGAOMXBK&&&%#@@@@%#W#B
@%%%%%%%&GEIndZNKOKDRKOKQW@%%@@@@%@@@@@@%%#W&
%%%@%%@%%%WZUW&B&BMXMW#@@@@@@@@@@@@@@@@@%%###
`

const (
	bannerWidth       = 45
	bannerPixelHeight = 68
	bannerData        = "" +
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	Version = "dev"
)

func renderColorBanner(version string) string {
	data, err := base64.StdEncoding.DecodeString(bannerData)
	if err != nil {
		return plainBanner
	}
	expected := bannerWidth * bannerPixelHeight * 3
	if len(data) != expected {
		return plainBanner
	}

	var b strings.Builder
	charH := bannerPixelHeight / 2
	for row := 0; row < charH; row++ {
		for col := 0; col < bannerWidth; col++ {
			topIdx := (row*2*bannerWidth + col) * 3
			botIdx := ((row*2+1)*bannerWidth + col) * 3
			tr, tg, tb := data[topIdx], data[topIdx+1], data[topIdx+2]
			br, bg, bb := data[botIdx], data[botIdx+1], data[botIdx+2]
			fmt.Fprintf(&b, "\033[38;2;%d;%d;%d;48;2;%d;%d;%dm▀", tr, tg, tb, br, bg, bb)
		}
		b.WriteString("\033[0m\n")
	}
	label := "dît " + version
	pad := (bannerWidth - len(label)) / 2
	if pad < 0 {
		pad = 0
	}
	b.WriteString(strings.Repeat(" ", pad))
	b.WriteString(label + "\n")
	return b.String()
}

// IsTerminal reports whether stderr is a terminal.
func IsTerminal() bool {
	fi, err := os.Stderr.Stat()
	if err != nil {
		return false
	}
	return fi.Mode()&os.ModeCharDevice != 0
}

// Banner returns the rendered banner string for the given version.
func Banner(version string) string {
	if IsTerminal() {
		return renderColorBanner(version)
	}
	label := "dît " + version
	pad := (bannerWidth - len(label)) / 2
	if pad < 0 {
		pad = 0
	}
	return plainBanner + strings.Repeat(" ", pad) + label + "\n"
}