/*
Copyright © Brian Buller <brian@bullercodeworks.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package widgets

import "github.com/gdamore/tcell"

type RelativeLayout struct {
	id              string
	style           tcell.Style
	widgetRelations map[Widget]widgetRelation

	active  bool
	visible bool
	x, y    int
	w, h    int
}

var _ Widget = (*RelativeLayout)(nil)

type widgetRelation struct {
	relation RelativeRelation
	relTo    Widget
}

type RelativeRelation int

const (
	RRAbove     = iota // Above Widget
	RRToRightOf        // To Right of Widget
	RRBelow            // Below Widget
	RRToLeftOf         // To Left of Widget
	RATop              // Anchored to parent Top
	RARight            // Anchored to parent Right
	RABottom           // Anchored to parent Bottom
	RALeft             // Anchored to parent Left
)

func NewRelativeLayout(id string, s tcell.Style) *RelativeLayout {
	ret := &RelativeLayout{}
	ret.Init(id, s)
	return ret
}

func (w *RelativeLayout) Init(id string, style tcell.Style) {
	w.id = id
	w.style = style
	w.visible = true
}
func (w *RelativeLayout) Id() string                         { return w.id }
func (w *RelativeLayout) HandleResize(ev *tcell.EventResize) {}
func (w *RelativeLayout) HandleKey(ev *tcell.EventKey) bool  { return false }
func (w *RelativeLayout) HandleTime(ev *tcell.EventTime)     {}
func (w *RelativeLayout) Draw(screen tcell.Screen) {
	if !w.visible {
		return
	}
	done := make(map[Widget]widgetRelation)
	rem := make(map[Widget]widgetRelation)
	for k, v := range w.widgetRelations {
		if v.relTo == w {
			done[k] = v
		} else {
			rem[k] = v
		}
	}
}
func (w *RelativeLayout) Active() bool      { return w.active }
func (w *RelativeLayout) SetActive(a bool)  { w.active = a }
func (w *RelativeLayout) Visible() bool     { return w.visible }
func (w *RelativeLayout) SetVisible(a bool) { w.visible = a }
func (w *RelativeLayout) Focusable() bool   { return true }
func (w *RelativeLayout) SetX(x int)        { w.x = x }
func (w *RelativeLayout) SetY(y int)        { w.y = y }
func (w *RelativeLayout) GetX() int         { return w.x }
func (w *RelativeLayout) GetY() int         { return w.y }
func (w *RelativeLayout) SetPos(c Coord)    { w.x, w.y = c.X, c.Y }
func (w *RelativeLayout) SetW(wd int)       { w.w = wd }
func (w *RelativeLayout) SetH(h int)        { w.h = h }
func (w *RelativeLayout) GetW() int         { return w.w }
func (w *RelativeLayout) GetH() int         { return w.h }
func (w *RelativeLayout) WantW() int        { return 1 }
func (w *RelativeLayout) WantH() int        { return 1 }
func (w *RelativeLayout) SetSize(c Coord)   { w.w, w.h = c.X, c.Y }

func (w *RelativeLayout) Add(n Widget, relTo Widget, relation RelativeRelation) {
	w.widgetRelations[n] = widgetRelation{
		relation: relation,
		relTo:    relTo,
	}
}