// Mines is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.

// Mines is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along with
// Mines. If not, see <https://www.gnu.org/licenses/>.

package space.jakob.mines

import android.content.Context
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.Canvas
import android.graphics.Rect
import android.graphics.Paint
import android.util.AttributeSet
import android.view.View
import android.util.Log

const val atlasWidth = 3

enum class AtlasEntry {
    BLANK, MASKED, UNMASKED,
    ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT,
    FLAG, UNKNOWN, MINE, TRIPPED,
}

class GameView(context: Context, attrs: AttributeSet) : View(context, attrs) {
    val atlas = BitmapFactory.decodeResource(context.resources, R.drawable.atlas);
    val tileWidth = atlas.width / 3

    var grid: Grid? = null

    var cameraX = 0.0f
    var cameraY = 0.0f
    var sightX = 5.0f
    var sightY = 5.0f

    val scaledWidth: Int
        get() = width / (sightX - cameraX).toInt()
    val scaledHeight: Int
        get() = height / (sightY - cameraY).toInt()

    private fun atlasRect(entry: AtlasEntry, tileWidth: Int): Rect {
        val x = (entry.ordinal % atlasWidth) * tileWidth
        val y = (entry.ordinal / atlasWidth) * tileWidth
        return Rect(x, y, x + tileWidth, y + tileWidth)
    }

    private fun drawTile(canvas: Canvas, entry: AtlasEntry, x: Int, y: Int) {
        val src = atlasRect(entry, tileWidth)
        val dst = Rect(x, y, x + scaledWidth, y + scaledHeight)
        canvas.drawBitmap(atlas, src, dst, null)
    }

    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)

        for (i in 0..5) {
            drawTile(canvas, AtlasEntry.MINE, i * scaledWidth - tileWidth / 2, 0)
        }
    }
}