package ui

import (
	coreobjects "github.com/DegustatorPonos/RuinesOfRafdolon/CoreObjects"
	settings "github.com/DegustatorPonos/RuinesOfRafdolon/Settings"
	rl "github.com/gen2brain/raylib-go/raylib"
)

// Scene implimetation that contains aligned UI elements
type Menu struct {
	manager *coreobjects.SceneManager
	// The space between the window border and the grid. Measured in fractions of a screen. [0; 1]
	PaddingX float32
	// The space between the window border and the grid. Measured in fractions of a screen. [0; 1]
	PaddingY float32
	// Base element
	Contents UIElement

	cache *layoutCache
}

func (base *Menu) Create(manager *coreobjects.SceneManager) {
	base.manager = manager
	base.cache = &layoutCache{}
	base.Contents.Init(base)
}

func (base *Menu) Destroy() {
}

func (base *Menu) Update() {
}

func (base *Menu) Draw() {
	if !base.cache.IsValid() {
		base.RecalculateCache()
	}
	rl.ClearBackground(rl.Black)
	if settings.State.DrawColliders {
		base.drawPaddings()
	}
	var span = rl.Rectangle {
		X: base.cache.OffsetX,
		Y: base.cache.OffsetY,
		Width: base.cache.Width,
		Height: base.cache.Height,
	}
	base.Contents.Draw(&span)
}

func (base *Menu) drawPaddings() {
	// Horizontal
	rl.DrawRectangle(0, 0, 
		int32(base.cache.ScreenResolution.X), 
		int32(base.cache.OffsetY), 
		rl.Red) 
	rl.DrawRectangle(0,
		int32(base.cache.ScreenResolution.Y) - int32(base.cache.OffsetY),
		int32(base.cache.ScreenResolution.X),
		int32(base.cache.OffsetY), 
		rl.Red) 
	// Vertical
	rl.DrawRectangle(0,
		int32(base.cache.OffsetY),
		int32(base.cache.OffsetX),
		int32(base.cache.ScreenResolution.Y - base.cache.OffsetY * 2), 
		rl.Blue) 
	rl.DrawRectangle(
		int32(base.cache.ScreenResolution.X - base.cache.OffsetX),
		int32(base.cache.OffsetY),
		int32(base.cache.OffsetX),
		int32(base.cache.ScreenResolution.Y - base.cache.OffsetY * 2), 
		rl.Blue) 
}

func (base *Menu) GetMousePosition() rl.Vector2 {
	return rl.GetMousePosition()
}

func (base *Menu) RecalculateCache() {
	base.cache.ScreenResolution = rl.Vector2 {
		X: float32(rl.GetScreenWidth()),
		Y: float32(rl.GetScreenHeight()),
	}
	base.cache.SpanResolution = rl.Vector2 {
		X: float32(rl.GetScreenWidth()),
		Y: float32(rl.GetScreenHeight()),
	}
	base.cache.CalculateOffsets(
		base.cache.SpanResolution.X, 
		base.cache.SpanResolution.Y, 
		base.PaddingX,
		base.PaddingY)
}