package stone

import "image/color"

// Application represents an application.
type Application struct {
	DamageBuffer
	
	title string
	backend Backend
	config Config
}

// SetTitle sets the application's title. If in a window, it will appear as the
// window's name.
func (application *Application) SetTitle (title string) {
	application.title = title
	application.backend.SetTitle(title)
}

// Run initializes the application, and then calls callback. Operations inside
// of callback are allowed to interact with the application. Depending on the
// backend used, this function may bind to the main thread.
func (application *Application) Run (
	callback func (application *Application),
) (
	err error,
) {
	// default values for certain parameters
	width, height := application.Size()
	if width  < 1 { width  = 80 }
	if height < 1 { height = 20 }
	application.DamageBuffer.SetSize(width, height)

	// TODO: load these from a file
	application.config.colors = [4]color.Color {
		color.RGBA { R: 0x2B, G: 0x30, B: 0x3C, A: 0xFF },
		color.RGBA { R: 0x4C, G: 0x56, B: 0x6A, A: 0xFF },
		color.RGBA { R: 0x2E, G: 0x34, B: 0x40, A: 0xFF },
		color.RGBA { R: 0xA8, G: 0x55, B: 0x5D, A: 0xFF },
	}
	
	application.config.padding = 4

	application.backend, err = instantiateBackend(application)
	if err != nil { return }
	application.backend.Run(callback)

	return
}