package at.bitfire.gfxtablet;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

import at.bitfire.gfxtablet.NetEvent.Type;

@SuppressLint("ViewConstructor")
public class CanvasView extends View {
    private static final String TAG = "GfxTablet.CanvasView";

    final SharedPreferences settings;
    final NetworkClient netClient;
	boolean acceptStylusOnly;
	int maxX, maxY;

    public CanvasView(Context context, NetworkClient networkClient) {
        super(context);
        this.netClient = networkClient;

        // process preferences
        settings = PreferenceManager.getDefaultSharedPreferences(context);
        acceptStylusOnly = settings.getBoolean(SettingsActivity.KEY_PREF_STYLUS_ONLY, false);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (settings.getBoolean(SettingsActivity.KEY_DARK_CANVAS, false))
            setBackgroundColor(Color.BLACK);
        else
            setBackgroundResource(R.drawable.bg_grid_pattern);
    }

    @Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        Log.i(TAG, "Canvas size changed: " + w + "x" + h + " (before: " + oldw + "x" + oldh + ")");
		maxX = w;
		maxY = h;
	}

	@Override
	public boolean onGenericMotionEvent(MotionEvent event) {
		if (isEnabled()) {
			for (int ptr = 0; ptr < event.getPointerCount(); ptr++)
				if (!acceptStylusOnly || (event.getToolType(ptr) == MotionEvent.TOOL_TYPE_STYLUS)) {
					Log.v(TAG, String.format("Generic motion event logged: %f|%f, pressure %f", event.getX(ptr), event.getY(ptr), event.getPressure(ptr)));
					if (event.getActionMasked() == MotionEvent.ACTION_HOVER_MOVE)
						netClient.getQueue().add(new NetEvent(Type.TYPE_MOTION,
							normalizeX(event.getX(ptr)),
							normalizeY(event.getY(ptr)),
							normalizePressure(event.getPressure(ptr))
						));
				}
			return true;
		}
		return false;
	}
	
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if (isEnabled()) {
			for (int ptr = 0; ptr < event.getPointerCount(); ptr++)
				if (!acceptStylusOnly || (event.getToolType(ptr) == MotionEvent.TOOL_TYPE_STYLUS)) {
					short nx = normalizeX(event.getX(ptr)),
						  ny = normalizeY(event.getY(ptr)),
						  npressure = normalizePressure(event.getPressure(ptr));
					Log.v(TAG, String.format("Touch event logged: action %d @ %f|%f (pressure %f)", event.getActionMasked(), event.getX(ptr), event.getY(ptr), event.getPressure(ptr)));
					switch (event.getActionMasked()) {
					case MotionEvent.ACTION_MOVE:
						netClient.getQueue().add(new NetEvent(Type.TYPE_MOTION, nx, ny, npressure));
						break;
					case MotionEvent.ACTION_DOWN:
						netClient.getQueue().add(new NetEvent(Type.TYPE_BUTTON, nx, ny, npressure, 0, true));
						break;
					case MotionEvent.ACTION_UP:
					case MotionEvent.ACTION_CANCEL:
						netClient.getQueue().add(new NetEvent(Type.TYPE_BUTTON, nx, ny, npressure, 0, false));
						break;
					}
						
				}
			return true;
		}
		return false;
	}
	
	
	short normalizeX(float x) {
		return (short)(Math.min(Math.max(0, x), maxX) * Short.MAX_VALUE/maxX);
	}
	
	short normalizeY(float x) {
		return (short)(Math.min(Math.max(0, x), maxY) * Short.MAX_VALUE/maxY);
	}
	
	short normalizePressure(float x) {
		return (short)(Math.min(Math.max(0, x), 2.0) * Short.MAX_VALUE/2.0);
	}
}