// Copyright 2012 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build windows

package declarative

import (
	"github.com/lxn/walk"
)

type Orientation byte

const (
	Horizontal Orientation = Orientation(walk.Horizontal)
	Vertical   Orientation = Orientation(walk.Vertical)
)

type Margins struct {
	Left   int
	Top    int
	Right  int
	Bottom int
}

func (m Margins) isZero() bool {
	return m.Left == 0 && m.Top == 0 && m.Right == 0 && m.Bottom == 0
}

func (m Margins) toW() walk.Margins {
	return walk.Margins{m.Left, m.Top, m.Right, m.Bottom}
}

type Size struct {
	Width  int
	Height int
}

func (s Size) toW() walk.Size {
	return walk.Size{s.Width, s.Height}
}

func setLayoutMargins(layout walk.Layout, margins Margins, marginsZero bool) error {
	if !marginsZero && margins.isZero() {
		margins = Margins{9, 9, 9, 9}
	}

	return layout.SetMargins(margins.toW())
}

func setLayoutSpacing(layout walk.Layout, spacing int, spacingZero bool) error {
	if !spacingZero && spacing == 0 {
		spacing = 6
	}

	return layout.SetSpacing(spacing)
}

type HBox struct {
	Margins     Margins
	Spacing     int
	MarginsZero bool
	SpacingZero bool
}

func (hb HBox) Create() (walk.Layout, error) {
	l := walk.NewHBoxLayout()

	if err := setLayoutMargins(l, hb.Margins, hb.MarginsZero); err != nil {
		return nil, err
	}

	if err := setLayoutSpacing(l, hb.Spacing, hb.SpacingZero); err != nil {
		return nil, err
	}

	return l, nil
}

type VBox struct {
	Margins     Margins
	Spacing     int
	MarginsZero bool
	SpacingZero bool
}

func (vb VBox) Create() (walk.Layout, error) {
	l := walk.NewVBoxLayout()

	if err := setLayoutMargins(l, vb.Margins, vb.MarginsZero); err != nil {
		return nil, err
	}

	if err := setLayoutSpacing(l, vb.Spacing, vb.SpacingZero); err != nil {
		return nil, err
	}

	return l, nil
}

type Grid struct {
	Columns     int
	Margins     Margins
	Spacing     int
	MarginsZero bool
	SpacingZero bool
}

func (g Grid) Create() (walk.Layout, error) {
	l := walk.NewGridLayout()

	if err := setLayoutMargins(l, g.Margins, g.MarginsZero); err != nil {
		return nil, err
	}

	if err := setLayoutSpacing(l, g.Spacing, g.SpacingZero); err != nil {
		return nil, err
	}

	return l, nil
}