package render

import (
	"fmt"
	"symph/parameter"
)

type noteTile = [parameter.RenderNoteHeight][parameter.RenderNoteWidth]rune

var noteChar noteTile

func init() {
	funnel := max(
		len(fmt.Sprintf(parameter.DropFunnelFormat, "0.0")),
		len(fmt.Sprintf(parameter.RiseFunnelFormat, "0.0")),
	)
	inner := parameter.RenderNoteWidth - 2

	// inner == PositionLookaheadWindow by construction; assert the
	// distance row and funnel still fit
	if parameter.RenderNoteHeight < 2+parameter.RenderRowStrip ||
		inner < parameter.RenderDistCols ||
		parameter.RenderNoteWidth < funnel ||
		parameter.RenderGapY < 1 {
		panic("Render tile too small: need height>=5, width-2>=RenderDistCols, width>=funnel, gapY>=1")
	}

	noteChar[0][0] = parameter.BorderSingleTopLeft
	noteChar[parameter.RenderNoteHeight-1][0] = parameter.BorderSingleBottomLeft
	noteChar[0][parameter.RenderNoteWidth-1] = parameter.BorderSingleTopRight
	noteChar[parameter.RenderNoteHeight-1][parameter.RenderNoteWidth-1] = parameter.BorderSingleBottomRight

	for i := 1; i < parameter.RenderNoteWidth-1; i++ {
		noteChar[0][i] = parameter.BorderSingleHorizontal
		noteChar[parameter.RenderNoteHeight-1][i] = parameter.BorderSingleHorizontal
	}

	for i := 1; i < parameter.RenderNoteHeight-1; i++ {
		noteChar[i][0] = parameter.BorderSingleVertical
		noteChar[i][parameter.RenderNoteWidth-1] = parameter.BorderSingleVertical
	}
}