// 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.support.v7.app.AppCompatActivity
import android.support.v4.view.GestureDetectorCompat
import android.os.Bundle
import android.view.GestureDetector
import android.view.ScaleGestureDetector
import android.view.MotionEvent
import android.util.Log

class GameActivity : AppCompatActivity() {
    lateinit var gameView: GameView
    lateinit var gestureDetector: GestureDetectorCompat
    lateinit var scaleGestureDetector: ScaleGestureDetector

    // Implements the callbacks for gestureDetector.
    val gestureListener = object : GestureDetector.SimpleOnGestureListener() {
        // TODO: Replace with onUp
        // override fun onDown(e: MotionEvent): Boolean {
        //     with (gameView) {
        //         grid?.let {
        //             val (x, y) = toGridCoordinates(e.x.toInt(), e.y.toInt())
        //             it.reveal(x, y)
        //             invalidate()
        //         }
        //     }
        //     return false
        // }

        override fun onScroll(e1: MotionEvent, e2: MotionEvent, dx: Float, dy: Float): Boolean {
            with (gameView) {
                moveCamera(dx.toDouble(), dy.toDouble())
                invalidate()
            }
            return false
        }
    }

    // Implements the callbacks for scaleGestureDetector.
    val scaleListener = object : ScaleGestureDetector.SimpleOnScaleGestureListener() {
        // override fun onScale(scaleGestureDetector: ScaleGestureDetector) : Boolean {
        //     with (gameView) {
        //         grid?.let {
        //             val factor = scaleGestureDetector.getScaleFactor()

        //             var currentDistance = sightX - cameraX
        //             var desiredDistance = currentDistance / factor
        //             var deltaDistance = Math.abs(desiredDistance - currentDistance) / 2

        //             if (factor < 1.0) {
        //                 cameraX = (cameraX - deltaDistance).coerceAtLeast(0.0)
        //                 sightX = (sightX + deltaDistance).coerceAtMost(it.width.toDouble() - cameraX)
        //             } else {
        //                 cameraX = cameraX + deltaDistance
        //                 sightX = sightX - deltaDistance
        //             }

        //             currentDistance = sightY - cameraY
        //             desiredDistance = currentDistance / factor
        //             deltaDistance = Math.abs(desiredDistance - currentDistance) / 2

        //             if (factor < 1.0) {
        //                 cameraY = (cameraY - deltaDistance).coerceAtLeast(0.0)
        //                 sightY = (sightY + deltaDistance).coerceAtMost(it.height.toDouble() - cameraY)
        //             } else {
        //                 cameraY = cameraY + deltaDistance
        //                 sightY = sightY - deltaDistance
        //             }
        //         }
        //     }
        //     return false
        // }
    }

    override fun onTouchEvent(event: MotionEvent): Boolean {
        return gestureDetector.onTouchEvent(event)
            || scaleGestureDetector.onTouchEvent(event)
            || super.onTouchEvent(event)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_game)

        var width = 8
        var height = 8
        var mines = 10

        getIntent()?.let {
            width = it.getIntExtra("WIDTH", width)
            height = it.getIntExtra("HEIGHT", height)
            mines = it.getIntExtra("MINES", mines)
        }

        gameView = findViewById(R.id.view) as GameView
        gameView.grid = Grid(width, height, mines)

        gestureDetector = GestureDetectorCompat(this, gestureListener)
        scaleGestureDetector = ScaleGestureDetector(this, scaleListener)
    }
}