package hhc_common

import (
	"fmt"
	"github.com/cheynewallace/tabby"
	"github.com/mattn/go-runewidth"
	"github.com/ttacon/chalk"
	"io"
	"strings"
	"text/tabwriter"
	"unicode"
)

func FPrintHelp(w io.Writer, h []SDTHelpInfo) {
	sw := &strings.Builder{}
	t := tabby.NewCustom(tabwriter.NewWriter(sw, 0, 0, 2, ' ', 0))
	for i, v := range h {
		t.AddLine(i, v.Name, v.Description)
	}
	t.Print()
	ostr := sw.String()
	pcrlf := strings.ReplaceAll(ostr, "\n", "\r\n")
	_, _ = fmt.Fprint(w, pcrlf)
}

func GetUnicodeDeleteWidth(r rune) int {
	// Tested with ASCII non-control, Chinese, Japanese characters and Emoji.
	// I am not sure this is ok for all Unicode characters, so I made it as a dedicated function.
	return runewidth.RuneWidth(r)
}

type PrintableMessage struct {
	Text  string
	Style chalk.Style
}

func splitStringInWidth(tw int, cll int, s string) []string {
	rstrl := []string{}
	nstr := strings.Builder{}
	lcc := cll
	for _, v := range []rune(s) {
		rw := runewidth.RuneWidth(v)
		if rw+lcc > tw {
			lcc = rw
			rstrl = append(rstrl, nstr.String())
			nstr = strings.Builder{}
			nstr.WriteRune(v)
		} else {
			lcc += rw
			nstr.WriteRune(v)
		}
	}
	if nstr.Len() > 0 {
		rstrl = append(rstrl, nstr.String())
	}
	return rstrl
}

func transToChalkedText(colorful bool, s string, styl chalk.Style) string {
	if colorful {
		if styl != nil {
			return styl.Style(s)
		}
	}
	return s
}

func PrintPrintablMessagesIntoLines(pm []PrintableMessage, termWidth int, colorful bool) []string {
	rlns := []string{}
	cln := strings.Builder{}
	clcnt := 0
	for _, v := range pm {
		sw := runewidth.StringWidth(v.Text)
		if sw+clcnt > termWidth {
			spll := splitStringInWidth(termWidth, clcnt, v.Text)
			for xis, vs := range spll {
				if xis == 0 {
					cln.WriteString(transToChalkedText(colorful, vs, v.Style))
					rlns = append(rlns, cln.String())
					cln = strings.Builder{}
					clcnt = 0
				} else {
					if xis == len(spll)-1 {
						cln.WriteString(transToChalkedText(colorful, vs, v.Style))
						clcnt += runewidth.StringWidth(vs)
					} else {
						rlns = append(rlns, transToChalkedText(colorful, vs, v.Style))
					}
				}
			}
		} else {
			clcnt += sw
			cln.WriteString(transToChalkedText(colorful, v.Text, v.Style))
		}
		if clcnt == termWidth {
			rlns = append(rlns, cln.String())
			cln = strings.Builder{}
		}
	}
	if cln.Len() > 0 {
		rlns = append(rlns, cln.String())
	}
	return rlns
}

func PrintStringIntoLines(s string, termWidth int) []string {
	if runewidth.StringWidth(s) <= termWidth {
		return []string{s}
	}
	rlns := []string{}
	cln := strings.Builder{}
	clcnt := 0
	ra := []rune(s)
	for _, v := range ra {
		rw := runewidth.RuneWidth(v)
		if rw+clcnt > termWidth {
			rlns = append(rlns, cln.String())
			cln = strings.Builder{}
			cln.WriteRune(v)
			clcnt = rw
		} else {
			cln.WriteRune(v)
			clcnt += rw
		}
	}
	if cln.Len() > 0 {
		rlns = append(rlns, cln.String())
	}
	return rlns
}

func TestRuneSlice(r1, r2 []rune) bool {
	if r1 == nil && r2 == nil {
		return true
	}
	if r1 == nil || r2 == nil {
		return false
	}
	if len(r1) != len(r2) {
		return false
	}
	for i := range r1 {
		if r1[i] != r2[i] {
			return false
		}
	}
	return true
}

func PrintRunesIntoLinesWithCursor(ra []rune, termWidth int, cursorPos int) (l []string, curY, curX int) {
	if runewidth.StringWidth(string(ra)) <= termWidth {
		return []string{string(ra)}, 0, cursorPos + 1
	}
	rlns := []string{}
	cln := strings.Builder{}
	clcnt := 0
	linecount := 0
	cpy, cpx := 0, 0
	hit := false
	for i, v := range ra {
		rw := runewidth.RuneWidth(v)
		if rw+clcnt > termWidth {
			rlns = append(rlns, cln.String())
			linecount++
			cln = strings.Builder{}
			cln.WriteRune(v)
			clcnt = rw
		} else {
			cln.WriteRune(v)
			clcnt += rw
		}
		if i == cursorPos {
			cpy = linecount
			cpx = clcnt
			hit = true
		}
	}
	if cln.Len() > 0 {
		rlns = append(rlns, cln.String())
		linecount++
	}
	if !hit {
		cpy = linecount - 1
		cpx = clcnt + 1
	}
	//fmt.Println("CPY=", cpy, "CPX=", cpx)
	return rlns, cpy, cpx
}

func FirstToUpper(s string) string {
	rs := []rune(s)
	if len(rs) > 0 {
		rs[0] = unicode.ToUpper(rs[0])
	}
	return string(rs)
}

func GetCompleteSuffix(cmd, prefix string) string {
	return strings.TrimPrefix(cmd, prefix) + " "
}