package ui

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

	"git.wxccs.org/iceking2nd/winauth-go/internal/i18n"
)

// rowAction is what the per-row ⋯ popup returns to the caller.
type rowAction int

const (
	rowActionNone rowAction = iota
	rowActionRename
	rowActionDelete
	rowActionMoveUp
	rowActionMoveDown
	rowActionChangeIcon
)

// rowActionMenu is the small popup opened by the ⋯ button on each entry
// row. It carries the target entry index so the caller knows which row
// the chosen action applies to. moveUp/moveDown are disabled (rendered
// but inert) when the index is at a boundary.
type rowActionMenu struct {
	idx         int
	canMoveUp   bool
	canMoveDown bool

	renameBtn     widget.Clickable
	deleteBtn     widget.Clickable
	moveUpBtn     widget.Clickable
	moveDownBtn   widget.Clickable
	changeIconBtn widget.Clickable
	cancelBtn     widget.Clickable
}

func newRowActionMenu(idx, total int) *rowActionMenu {
	return &rowActionMenu{
		idx:         idx,
		canMoveUp:   idx > 0,
		canMoveDown: idx < total-1,
	}
}

// Pick reports the user's choice and whether the menu should close.
func (m *rowActionMenu) Pick(gtx layout.Context) (rowAction, bool) {
	switch {
	case m.renameBtn.Clicked(gtx):
		return rowActionRename, true
	case m.deleteBtn.Clicked(gtx):
		return rowActionDelete, true
	case m.moveUpBtn.Clicked(gtx):
		if !m.canMoveUp {
			return rowActionNone, false
		}
		return rowActionMoveUp, true
	case m.moveDownBtn.Clicked(gtx):
		if !m.canMoveDown {
			return rowActionNone, false
		}
		return rowActionMoveDown, true
	case m.changeIconBtn.Clicked(gtx):
		return rowActionChangeIcon, true
	case m.cancelBtn.Clicked(gtx):
		return rowActionNone, true
	}
	return rowActionNone, false
}

func (m *rowActionMenu) Layout(gtx layout.Context, th *material.Theme) layout.Dimensions {
	fillBackground(gtx, activePalette.ScrimBg)

	row := func(btn *widget.Clickable, label string, enabled bool) layout.FlexChild {
		return layout.Rigid(func(gtx layout.Context) layout.Dimensions {
			return layout.Inset{Top: unit.Dp(4), Bottom: unit.Dp(4)}.Layout(gtx,
				func(gtx layout.Context) layout.Dimensions {
					gtx.Constraints.Min.X = gtx.Constraints.Max.X
					b := material.Button(th, btn, label)
					if !enabled {
						// Visually dim the disabled state; Pick also
						// refuses to dispatch the action so clicks
						// are inert beyond the colour change.
						b.Background = activePalette.RingBg
						b.Color = activePalette.MutedFg
					}
					return b.Layout(gtx)
				})
		})
	}

	return layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
		gtx.Constraints.Max.X = gtx.Dp(260)
		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, i18n.T("dialog_row_actions_title")).Layout),
					layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
					row(&m.renameBtn, i18n.T("action_rename"), true),
					row(&m.deleteBtn, i18n.T("action_delete"), true),
					row(&m.changeIconBtn, i18n.T("action_change_icon"), true),
					row(&m.moveUpBtn, i18n.T("action_move_up"), m.canMoveUp),
					row(&m.moveDownBtn, i18n.T("action_move_down"), m.canMoveDown),
					layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.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, &m.cancelBtn, i18n.T("btn_cancel")).Layout),
						)
					}),
				)
			})
		})
	})
}