package main

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

func redraw () {
	width, height := application.Size()
	state.columns  = (width - 20) / 23 + 1
	state.rows     = height / 10 + 1
	state.pageSize = state.columns * state.rows

	monthIter := state.viewingMonth
	xOffset := (width - state.columns * 23) / 2 + 1
	for y := 0; y < state.rows; y ++ {
		for x := 0; x < state.columns;  x ++ {
			drawMonth (
				x * 23 + xOffset, y * 10,
				monthIter / 12,
				time.Month(wrap(monthIter, 12) + 1))
			monthIter ++
		}
	}
}

func drawMonth (xOffset, yOffset, year int, month time.Month) {
	current := int(month) - 1 + year * 12 == state.currentMonth

	bce := year < 0
	if bce { year *= -1 }

	var dateString string
	dateString = fmt.Sprintf("%d ", year)
	if bce { dateString += "BCE " }
	dateString += month.String()
	application.SetDot(xOffset + (20 - len(dateString)) / 2, yOffset)
	fmt.Fprint(application, dateString)

	var headerColor stone.Color
	if current {
		headerColor = stone.ColorRed
	} else {
		headerColor = stone.ColorForeground
	}
	for x := xOffset; x < 20 + xOffset; x ++ {
		application.SetColor(x, yOffset, headerColor)
	}

	application.SetDot(xOffset, yOffset + 2)
	fmt.Fprint (
		application,
		"S  M  T  W  Þ  F  S\n")
	application.SetColor(xOffset,      yOffset + 2, stone.ColorDim)
	application.SetColor(xOffset + 18, yOffset + 2, stone.ColorDim)
		
	dayIter := 0 - int(firstOfMonth(year, month).Weekday())
	if dayIter <= -6 {
		dayIter = 1
	}
	x, y, weekday := xOffset, yOffset + 3, 0
	totalDays := daysInMonth(year, month)
	for ; dayIter <= totalDays; dayIter ++ {
		if dayIter > 0 {
			application.SetDot(x, y)
			fmt.Fprint(application, dayIter)
		}

		if current && dayIter == int(time.Now().Day()) {
			application.SetColor(x,     y, stone.ColorRed)
			application.SetColor(x + 1, y, stone.ColorRed)
			application.SetStyle(x   , y, stone.StyleHighlight)
			application.SetStyle(x + 1, y, stone.StyleHighlight)
		} else if weekday == 0 || weekday == 6 {
			application.SetColor(x,     y, stone.ColorDim)
			application.SetColor(x + 1, y, stone.ColorDim)
		}

		weekday = (weekday + 1) % 7
		x += 3
		if x > xOffset + 20 {
			x = xOffset
			y ++
		}
	}
}