/*
 * opsu!dance - fork of opsu! with cursordance auto
 * Copyright (C) 2016 yugecin
 *
 * opsu!dance 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.
 *
 * opsu!dance 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 opsu!dance.  If not, see <http://www.gnu.org/licenses/>.
 */
package yugecin.opsudance.sbv2;

import itdelatrisu.opsu.objects.curves.Vec2f;
import itdelatrisu.opsu.ui.Fonts;
import org.newdawn.slick.Color;
import org.newdawn.slick.Graphics;
import yugecin.opsudance.sbv2.movers.StoryboardMover;

import java.util.ArrayList;
import java.util.List;

public class StoryboardMoveImpl implements StoryboardMove {

	private static final int POINTSIZE = 3;

	private Vec2f start;
	private Vec2f end;
	private List<StoryboardMover> movers;
	private List<Vec2f> midPoints;

	private StoryboardMover nextMover;
	private Vec2f currentPoint;
	private StoryboardMover prevMover;

	private float totalLength;

	public StoryboardMoveImpl(Vec2f start, Vec2f end) {
		this.start = start;
		this.end = end;
		movers = new ArrayList<>();
		midPoints = new ArrayList<>();
	}

	@Override
	public void add(StoryboardMover mover) {
		mover.end = end;
		if (movers.size() == 0) {
			mover.start = start;
			mover.recalculateLength();
			totalLength += mover.getLength();
		} else {
			StoryboardMover lastMover = movers.get(movers.size() - 1);
			Vec2f mid = new Vec2f(
				(lastMover.start.x + lastMover.end.x) / 2f,
				(lastMover.start.y + lastMover.end.y) / 2f
			);
			midPoints.add(mid);
			lastMover.end = mid;
			totalLength -= lastMover.getLength();
			lastMover.recalculateLength();
			totalLength += lastMover.getLength();
			mover.start = mid;
		}
		movers.add(mover);
		recalculateTimes();
	}

	@Override
	public float[] getPointAt(float t) {
		if (movers.size() == 0) {
			return new float[] { end.x, end.y };
		}
		float cumulativeTime = 0f;
		for (StoryboardMover mover : movers) {
			cumulativeTime += mover.timeLengthPercentOfTotalTime;
			if (cumulativeTime > t) {
				return mover.getPointAt((t - (cumulativeTime - mover.timeLengthPercentOfTotalTime)) / mover.timeLengthPercentOfTotalTime);
			}
		}
		return new float[] { end.x, end.y };
	}

	@Override
	public void update(int delta, int x, int y) {
		if (currentPoint != null) {
			moveCurrentPoint(x, y);
		}
	}

	@Override
	public void mousePressed(int x, int y) {
		int i = 0;
		for (Vec2f point : midPoints) {
			if (point.x - POINTSIZE <= x && x <= point.x + POINTSIZE && point.y - POINTSIZE <= y && y <= point.y + POINTSIZE) {
				currentPoint = point;
				prevMover = movers.get(i);
				nextMover = movers.get(i + 1);
				break;
			}
			i++;
		}
	}

	@Override
	public void mouseReleased(int x, int y) {
		if (currentPoint != null) {
			moveCurrentPoint(x, y);
			totalLength -= prevMover.getLength() + nextMover.getLength();
			prevMover.recalculateLength();
			nextMover.recalculateLength();
			totalLength += prevMover.getLength() + nextMover.getLength();
			currentPoint = null;
			recalculateTimes();
		}
	}

	@Override
	public void recalculateTimes() {
		for (StoryboardMover mover : movers) {
			mover.timeLengthPercentOfTotalTime = mover.getLength() / totalLength;
		}
	}

	private void moveCurrentPoint(int x, int y) {
		currentPoint.x = x;
		currentPoint.y = y;
		prevMover.end = currentPoint;
		nextMover.start = currentPoint;
	}

	@Override
	public void render(Graphics g) {
		for (StoryboardMover mover : movers) {
			mover.render(g);
		}
		g.setColor(Color.cyan);
		for (Vec2f point : midPoints) {
			g.fillRect(point.x - POINTSIZE, point.y - POINTSIZE, POINTSIZE * 2 + 1, POINTSIZE * 2 + 1);
		}
	}

}