package ui

import (
	"gioui.org/layout"
	"gioui.org/unit"
	"gioui.org/widget"
	"gioui.org/widget/material"

	"git.wxccs.org/iceking2nd/winauth-go/internal/authenticator"
)

// Dialog is the common contract implemented by every modal dialog.
// onDone is invoked with the newly built authenticator + display name on
// successful submission, or with (nil, "") on cancel.
type Dialog interface {
	Layout(gtx layout.Context, th *material.Theme,
		onDone func(authenticator.Authenticator, string)) layout.Dimensions
}

// modalCard renders the standard backdrop + centered card with the given
// title, body widget and an OK + Cancel button row. okLabel allows callers
// to override the primary button label (e.g. "Enroll" for Battle.Net).
//
// The function does not handle the click events itself; callers should
// query okBtn.Clicked / cancelBtn.Clicked before laying out so they can
// short-circuit the frame.
func modalCard(
	gtx layout.Context,
	th *material.Theme,
	title string,
	okLabel string,
	cancelLabel string,
	okBtn *widget.Clickable,
	cancelBtn *widget.Clickable,
	body layout.Widget,
) layout.Dimensions {
	fillBackground(gtx, activePalette.ScrimBg)

	return layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
		gtx.Constraints.Max.X = gtx.Dp(420)
		return widget.Border{
			Color:        activePalette.DialogBorder,
			CornerRadius: unit.Dp(4),
			Width:        unit.Dp(1),
		}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
			fillBackground(gtx, activePalette.DialogBg)
			return layout.UniformInset(unit.Dp(16)).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
				return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
					layout.Rigid(material.H6(th, title).Layout),
					layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
					layout.Rigid(body),
					layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
					layout.Rigid(func(gtx layout.Context) layout.Dimensions {
						return layout.Flex{Axis: layout.Horizontal, Spacing: layout.SpaceStart}.Layout(gtx,
							layout.Rigid(material.Button(th, cancelBtn, cancelLabel).Layout),
							layout.Rigid(func(gtx layout.Context) layout.Dimensions {
								return layout.Inset{Left: unit.Dp(8)}.Layout(gtx,
									material.Button(th, okBtn, okLabel).Layout)
							}),
						)
					}),
				)
			})
		})
	})
}

// modalCardCancel is a variant of modalCard with only a Cancel button.
// Useful for dialogs whose primary actions live inside the body itself
// (e.g. the QR scan dialog with separate "from file" / "from clipboard"
// buttons).
func modalCardCancel(
	gtx layout.Context,
	th *material.Theme,
	title string,
	cancelLabel string,
	cancelBtn *widget.Clickable,
	body layout.Widget,
) layout.Dimensions {
	fillBackground(gtx, activePalette.ScrimBg)

	return layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
		gtx.Constraints.Max.X = gtx.Dp(420)
		return widget.Border{
			Color:        activePalette.DialogBorder,
			CornerRadius: unit.Dp(4),
			Width:        unit.Dp(1),
		}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
			fillBackground(gtx, activePalette.DialogBg)
			return layout.UniformInset(unit.Dp(16)).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
				return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
					layout.Rigid(material.H6(th, title).Layout),
					layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
					layout.Rigid(body),
					layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
					layout.Rigid(func(gtx layout.Context) layout.Dimensions {
						return layout.Flex{Axis: layout.Horizontal, Spacing: layout.SpaceStart}.Layout(gtx,
							layout.Rigid(material.Button(th, cancelBtn, cancelLabel).Layout),
						)
					}),
				)
			})
		})
	})
}

// errorLabel returns a layout widget that renders msg in red, or nothing
// when msg is empty. Used by dialogs to display validation errors.
func errorLabel(th *material.Theme, msg string) layout.Widget {
	return func(gtx layout.Context) layout.Dimensions {
		if msg == "" {
			return layout.Dimensions{}
		}
		lbl := material.Body2(th, msg)
		lbl.Color = activePalette.ErrorFg
		return layout.Inset{Top: unit.Dp(8)}.Layout(gtx, lbl.Layout)
	}
}

// labeledEditor lays out a small body label above the editor. hint is the
// editor placeholder text.
func labeledEditor(th *material.Theme, label string, ed *widget.Editor, hint string) layout.Widget {
	return func(gtx layout.Context) layout.Dimensions {
		return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
			layout.Rigid(material.Body2(th, label).Layout),
			layout.Rigid(material.Editor(th, ed, hint).Layout),
			layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
		)
	}
}