/*
 * Pixel Dungeon
 * Copyright (C) 2012-2015  Oleg Dolya
 *
 * Shattered Pixel Dungeon
 * Copyright (C) 2014-2015 Evan Debenham
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>
 */
package com.shatteredpixel.shatteredpixeldungeon.scenes;

import java.nio.FloatBuffer;
import java.util.Calendar;

import com.shatteredpixel.shatteredpixeldungeon.ShatteredPixelDungeon;
import com.shatteredpixel.shatteredpixeldungeon.messages.Messages;
import com.watabou.gltextures.Gradient;
import com.watabou.gltextures.SmartTexture;
import com.watabou.glwrap.Matrix;
import com.watabou.glwrap.Quad;
import com.watabou.input.Touchscreen.Touch;
import com.watabou.noosa.Camera;
import com.watabou.noosa.ColorBlock;
import com.watabou.noosa.Game;
import com.watabou.noosa.Group;
import com.watabou.noosa.Image;
import com.watabou.noosa.NoosaScript;
import com.watabou.noosa.TextureFilm;
import com.watabou.noosa.TouchArea;
import com.watabou.noosa.Visual;
import com.watabou.noosa.audio.Music;
import com.shatteredpixel.shatteredpixeldungeon.Assets;
import com.shatteredpixel.shatteredpixeldungeon.Badges;
import com.shatteredpixel.shatteredpixeldungeon.Dungeon;
import com.shatteredpixel.shatteredpixeldungeon.actors.hero.HeroClass;
import com.shatteredpixel.shatteredpixeldungeon.sprites.RatSprite;
import com.shatteredpixel.shatteredpixeldungeon.ui.Archs;
import com.shatteredpixel.shatteredpixeldungeon.ui.RedButton;
import com.watabou.utils.Point;
import com.watabou.utils.Random;

public class SurfaceScene extends PixelScene {

	private static final int FRAME_WIDTH    = 88;
	private static final int FRAME_HEIGHT    = 125;

	private static final int FRAME_MARGIN_TOP    = 9;
	private static final int FRAME_MARGIN_X        = 4;

	private static final int BUTTON_HEIGHT    = 20;

	private static final int SKY_WIDTH    = 80;
	private static final int SKY_HEIGHT    = 112;

	private static final int NSTARS		= 100;
	private static final int NCLOUDS	= 5;
	
	private Camera viewport;
	@Override
	public void create() {
		
		super.create();
		
		Music.INSTANCE.play( Assets.HAPPY, true );
		Music.INSTANCE.volume( ShatteredPixelDungeon.musicVol() / 10f );
		
		uiCamera.visible = false;
		
		int w = Camera.main.width;
		int h = Camera.main.height;
		
		Archs archs = new Archs();
		archs.reversed = true;
		archs.setSize( w, h );
		add( archs );

		float vx = (w - SKY_WIDTH) / 2;
		float vy = (h - SKY_HEIGHT - BUTTON_HEIGHT) / 2;

		Point s = Camera.main.cameraToScreen( vx, vy );
		viewport = new Camera( s.x, s.y, SKY_WIDTH, SKY_HEIGHT, defaultZoom );
		Camera.add( viewport );
		
		Group window = new Group();
		window.camera = viewport;
		add( window );
		
		boolean dayTime = Calendar.getInstance().get(Calendar.HOUR_OF_DAY) >= 7;
		
		Sky sky = new Sky( dayTime );
		sky.scale.set( SKY_WIDTH, SKY_HEIGHT );
		window.add( sky );
		
		if (!dayTime) {
			for (int i=0; i < NSTARS; i++) {
				float size = Random.Float();
				ColorBlock star = new ColorBlock( size, size, 0xFFFFFFFF );
				star.x = Random.Float( SKY_WIDTH ) - size / 2;
				star.y = Random.Float( SKY_HEIGHT ) - size / 2;
				star.am = size * (1 - star.y / SKY_HEIGHT);
				window.add( star );
			}
		}
		
		float range = SKY_HEIGHT * 2 / 3;
		for (int i=0; i < NCLOUDS; i++) {
			Cloud cloud = new Cloud( (NCLOUDS - 1 - i) * (range / NCLOUDS) + Random.Float( range / NCLOUDS ), dayTime );
			window.add( cloud );
		}
		
		int nPatches = (int)(sky.width() / GrassPatch.WIDTH + 1);
		
		for (int i=0; i < nPatches * 4; i++) {
			GrassPatch patch = new GrassPatch( (i - 0.75f) * GrassPatch.WIDTH / 4, SKY_HEIGHT + 1, dayTime );
			patch.brightness( dayTime ? 0.7f : 0.4f );
			window.add( patch );
		}
		
		Avatar a = new Avatar( Dungeon.hero.heroClass );
		// Removing semitransparent contour
		a.am = 2; a.aa = -1;
		a.x = (SKY_WIDTH - a.width) / 2;
		a.y = SKY_HEIGHT - a.height;
		window.add( a );
		
		final Pet pet = new Pet();
		pet.rm = pet.gm = pet.bm = 1.2f;
		pet.x = SKY_WIDTH / 2 + 2;
		pet.y = SKY_HEIGHT - pet.height;
		window.add( pet );
		
		window.add( new TouchArea( sky ) {
			protected void onClick( Touch touch ) {
				pet.jump();
			}
		} );
		
		for (int i=0; i < nPatches; i++) {
			GrassPatch patch = new GrassPatch( (i - 0.5f) * GrassPatch.WIDTH, SKY_HEIGHT, dayTime );
			patch.brightness( dayTime ? 1.0f : 0.8f );
			window.add( patch );
		}
		
		Image frame = new Image( Assets.SURFACE );

		frame.frame( 0, 0, FRAME_WIDTH, FRAME_HEIGHT );
		frame.x = vx - FRAME_MARGIN_X;
		frame.y = vy - FRAME_MARGIN_TOP;
		add( frame );

		if (dayTime) {
			a.brightness( 1.2f );
			pet.brightness( 1.2f );
		} else {
			frame.hardlight( 0xDDEEFF );
		}

		RedButton gameOver = new RedButton( Messages.get(this, "exit") ) {
			protected void onClick() {
				Game.switchScene( TitleScene.class );
			}
		};
		gameOver.setSize( SKY_WIDTH - FRAME_MARGIN_X * 2, BUTTON_HEIGHT );
		gameOver.setPos( frame.x + FRAME_MARGIN_X * 2, frame.y + frame.height + 4 );
		add( gameOver );
		
		Badges.validateHappyEnd();
		
		fadeIn();
	}
	
	@Override
	public void destroy() {
		Badges.saveGlobal();
		
		Camera.remove( viewport );
		super.destroy();
	}
	
	@Override
	protected void onBackPressed() {
	}
	
	private static class Sky extends Visual {
		
		private static final int[] day		= {0xFF4488FF, 0xFFCCEEFF};
		private static final int[] night	= {0xFF001155, 0xFF335980};
		
		private SmartTexture texture;
		private FloatBuffer verticesBuffer;
		
		public Sky( boolean dayTime ) {
			super( 0, 0, 1, 1 );

			texture = new Gradient( dayTime ? day : night );
			
			float[] vertices = new float[16];
			verticesBuffer = Quad.create();
			
			vertices[2]		= 0.25f;
			vertices[6]		= 0.25f;
			vertices[10]	= 0.75f;
			vertices[14]	= 0.75f;
			
			vertices[3]		= 0;
			vertices[7]		= 1;
			vertices[11]	= 1;
			vertices[15]	= 0;
			
			
			vertices[0] 	= 0;
			vertices[1] 	= 0;
			
			vertices[4] 	= 1;
			vertices[5] 	= 0;
			
			vertices[8] 	= 1;
			vertices[9] 	= 1;
			
			vertices[12]	= 0;
			vertices[13]	= 1;
			
			verticesBuffer.position( 0 );
			verticesBuffer.put( vertices );
		}
		
		@Override
		public void draw() {
			
			super.draw();

			NoosaScript script = NoosaScript.get();
			
			texture.bind();
			
			script.camera( camera() );
			
			script.uModel.valueM4( matrix );
			script.lighting(
				rm, gm, bm, am,
				ra, ga, ba, aa );
			
			script.drawQuad( verticesBuffer );
		}
	}
	
	private static class Cloud extends Image {
		
		private static int lastIndex = -1;
		
		public Cloud( float y, boolean dayTime ) {
			super( Assets.SURFACE );
			
			int index;
			do {
				index = Random.Int( 3 );
			} while (index == lastIndex);
			
			switch (index) {
			case 0:
				frame( 88, 0, 49, 20 );
				break;
			case 1:
				frame( 88, 20, 49, 22 );
				break;
			case 2:
				frame( 88, 42, 50, 18 );
				break;
			}
			
			lastIndex = index;
			
			this.y = y;

			scale.set( 1 - y / SKY_HEIGHT );
			x = Random.Float( SKY_WIDTH + width() ) - width();
			speed.x = scale.x * (dayTime ? +8 : -8);
			
			if (dayTime) {
				tint( 0xCCEEFF, 1 - scale.y );
			} else {
				rm = gm = bm = +3.0f;
				ra = ga = ba = -2.1f;
			}
		}
		
		@Override
		public void update() {
			super.update();
			if (speed.x > 0 && x > SKY_WIDTH) {
				x = -width();
			} else if (speed.x < 0 && x < -width()) {
				x = SKY_WIDTH;
			}
		}
	}

	private static class Avatar extends Image {
		
		private static final int WIDTH	= 24;
		private static final int HEIGHT	= 32;
		
		public Avatar( HeroClass cl ) {
			super( Assets.AVATARS );
			frame( new TextureFilm( texture, WIDTH, HEIGHT ).get( cl.ordinal() ) );
		}
	}
	
	private static class Pet extends RatSprite {
		
		public void jump() {
			play( run );
		}
		
		@Override
		public void onComplete( Animation anim ) {
			if (anim == run) {
				idle();
			}
		}
	}
	
	private static class GrassPatch extends Image {
		
		public static final int WIDTH	= 16;
		public static final int HEIGHT	= 14;
		
		private float tx;
		private float ty;
		
		private double a = Random.Float( 5 );
		private double angle;
		
		private boolean forward;
		
		public GrassPatch( float tx, float ty, boolean forward ) {
			
			super( Assets.SURFACE );
			
			frame( 88 + Random.Int( 4 ) * WIDTH, 60, WIDTH, HEIGHT );
			
			this.tx = tx;
			this.ty = ty;
			
			this.forward = forward;
		}
		
		@Override
		public void update() {
			super.update();
			a += Random.Float( Game.elapsed * 5 );
			angle = (2 + Math.cos( a )) * (forward ? +0.2 : -0.2);
			
			scale.y = (float)Math.cos( angle );
			
			x = tx + (float)Math.tan( angle ) * width;
			y = ty - scale.y * height;
		}
		
		@Override
		protected void updateMatrix() {
			super.updateMatrix();
			Matrix.skewX( matrix, (float)(angle / Matrix.G2RAD) );
		}
	}
}