package gel

import (
	"regexp"

	"golang.org/x/exp/shiny/materialdesign/icons"

	l "github.com/p9c/p9/pkg/gel/gio/layout"
)

type Input struct {
	*Window
	editor               *Editor
	input                *TextInput
	clearClickable       *Clickable
	clearButton          *IconButton
	copyClickable        *Clickable
	copyButton           *IconButton
	pasteClickable       *Clickable
	pasteButton          *IconButton
	GetText              func() string
	SetText              func(string)
	SetPasteFunc         func() bool
	borderColor          string
	borderColorUnfocused string
	borderColorFocused   string
	backgroundColor      string
	focused              bool
}

var findSpaceRegexp = regexp.MustCompile(`\s+`)

func (w *Window) Input(
	txt, hint, borderColorFocused, borderColorUnfocused, backgroundColor string,
	submit, change func(txt string),
) *Input {
	editor := w.Editor().SingleLine().Submit(false)
	input := w.TextInput(editor, hint).TextScale(1)
	p := &Input{
		Window:               w,
		clearClickable:       w.Clickable(),
		copyClickable:        w.Clickable(),
		pasteClickable:       w.Clickable(),
		editor:               editor,
		input:                input,
		borderColorUnfocused: borderColorUnfocused,
		borderColorFocused:   borderColorFocused,
		backgroundColor:      backgroundColor,
	}
	p.GetText = func() string {
		return p.editor.Text()
	}
	p.SetText = func(s string) {
		p.editor.SetText(s)
	}
	p.clearButton = w.IconButton(p.clearClickable)
	p.copyButton = w.IconButton(p.copyClickable)
	p.pasteButton = w.IconButton(p.pasteClickable)
	clearClickableFn := func() {
		p.editor.SetText("")
		p.editor.changeHook("")
		p.editor.Focus()
	}
	copyClickableFn := func() {
		p.ClipboardWriteReqs <- p.editor.Text()
		p.editor.Focus()
	}
	pasteClickableFn := func() {
		p.ClipboardReadReqs <- func(cs string) {
			cs = findSpaceRegexp.ReplaceAllString(cs, " ")
			p.editor.Insert(cs)
			p.editor.changeHook(cs)
			p.editor.Focus()
		}
	}
	p.clearButton.
		Icon(
			w.Icon().
				Color("DocText").
				Src(&icons.ContentBackspace),
		)
	p.copyButton.
		Icon(
			w.Icon().
				Color("DocText").
				Src(&icons.ContentContentCopy),
		)
	p.pasteButton.
		Icon(
			w.Icon().
				Color("DocText").
				Src(&icons.ContentContentPaste),
		)
	p.input.Color("DocText")
	p.clearClickable.SetClick(clearClickableFn)
	p.copyClickable.SetClick(copyClickableFn)
	p.pasteClickable.SetClick(pasteClickableFn)
	p.editor.SetText(txt)
	p.editor.SetSubmit(
		func(txt string) {
			go func() {
				submit(txt)
			}()
		},
	).SetChange(
		change,
	).SetFocus(
		func(is bool) {
			if is {
				p.borderColor = p.borderColorFocused
			} else {
				p.borderColor = p.borderColorUnfocused
			}
		},
	)
	return p
}

// Fn renders the input widget
func (in *Input) Fn(gtx l.Context) l.Dimensions {
	// gtx.Constraints.Max.X = int(in.TextSize.Scale(float32(in.size)).True)
	// gtx.Constraints.Min.X = 0
	// width := int(in.Theme.TextSize.Scale(in.size).True)
	// gtx.Constraints.Max.X, gtx.Constraints.Min.X = width, width
	return in.Border().
		Width(0.125).
		CornerRadius(0.0).
		Color(in.borderColor).
		Embed(
			in.Fill(
				in.backgroundColor, l.Center, float32(in.TextSize), 0,
				in.Inset(
					0.25,
					in.Flex().
						Flexed(
							1,
							in.Inset(0.125, in.input.Color("DocText").Fn).Fn,
						).
						Rigid(
							in.copyButton.
								Background("").
								Icon(in.Icon().Color(in.borderColor).Scale(Scales["H6"]).Src(&icons.ContentContentCopy)).
								ButtonInset(0.25).
								Fn,
						).
						Rigid(
							in.pasteButton.
								Background("").
								Icon(in.Icon().Color(in.borderColor).Scale(Scales["H6"]).Src(&icons.ContentContentPaste)).
								ButtonInset(0.25).
								Fn,
						).
						Rigid(
							in.clearButton.
								Background("").
								Icon(in.Icon().Color(in.borderColor).Scale(Scales["H6"]).Src(&icons.ContentBackspace)).
								ButtonInset(0.25).
								Fn,
						).
						Fn,
				).Fn,
			).Fn,
		).Fn(gtx)
}