package main

import "sync"
import "time"
import "git.tebibyte.media/sashakoshka/stone"

var lock sync.Mutex

func onScroll (x, y int) {
	lock.Lock()
	defer lock.Unlock()
	
	state.viewingMonth += y * state.columns
	application.Clear()
	redraw()
	application.Draw()
}

func onPress (button stone.Button, modifiers stone.Modifiers) {
	lock.Lock()
	defer lock.Unlock()
	
	switch button {
	case stone.KeyUp:
		state.viewingMonth -= state.columns
		application.Clear()
		redraw()
		application.Draw()
		
	case stone.KeyDown:
		state.viewingMonth += state.columns
		application.Clear()
		redraw()
		application.Draw()
		
	case stone.KeyPageUp:
		state.viewingMonth -= state.pageSize
		application.Clear()
		redraw()
		application.Draw()
		
	case stone.KeyPageDown:
		state.viewingMonth += state.pageSize
		application.Clear()
		redraw()
		application.Draw()
		
	}
}

func onStart () {
	lock.Lock()
	defer lock.Unlock()
	
	state.currentMonth = canonMonth(time.Now())
	state.viewingMonth = state.currentMonth
	redraw()
	go func () {
		for {
			time.Sleep(time.Second)
			onTick()
		}
	} ()
}

func onResize () {
	lock.Lock()
	defer lock.Unlock()
	
	redraw()
}

func onTick () {
	lock.Lock()
	defer lock.Unlock()

	within :=
		state.currentMonth >= state.viewingMonth &&
		state.currentMonth <  state.viewingMonth + state.pageSize

	newMonth := canonMonth(time.Now())
	if state.currentMonth != newMonth {
		state.currentMonth = newMonth

		if within {
			if state.currentMonth < state.viewingMonth {
				state.viewingMonth -= state.pageSize
			} else if state.currentMonth >= state.pageSize {
				state.viewingMonth += state.pageSize
			}
		}
		
		application.Clear()
		redraw()
		application.Draw()
	}
}