/******************************************************************************
 * Spine Runtimes Software License
 * Version 2.1
 * 
 * Copyright (c) 2013, Esoteric Software
 * All rights reserved.
 * 
 * You are granted a perpetual, non-exclusive, non-sublicensable and
 * non-transferable license to install, execute and perform the Spine Runtimes
 * Software (the "Software") solely for internal use. Without the written
 * permission of Esoteric Software (typically granted by licensing Spine), you
 * may not (a) modify, translate, adapt or otherwise create derivative works,
 * improvements of the Software or develop new applications using the Software
 * or (b) remove, delete, alter or obscure any trademarks or any copyright,
 * trademark, patent or other intellectual property or proprietary rights
 * notices on or in the Software, including any copy thereof. Redistributions
 * in binary or source form must include this license and terms.
 * 
 * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

using System;
using System.IO;
using UnityEngine;
using Spine;

/// <summary>Loads and stores a Spine atlas and list of materials.</summary>
public class AtlasAsset : ScriptableObject {
	public TextAsset atlasFile;
	public Material[] materials;
	private Atlas atlas;

	public void Reset () {
		atlas = null;
	}

	/// <returns>The atlas or null if it could not be loaded.</returns>
	public Atlas GetAtlas () {
		if (atlasFile == null) {
			Debug.LogError("Atlas file not set for atlas asset: " + name, this);
			Reset();
			return null;
		}

		if (materials == null || materials.Length == 0) {
			Debug.LogError("Materials not set for atlas asset: " + name, this);
			Reset();
			return null;
		}

		if (atlas != null)
			return atlas;

		try {
			atlas = new Atlas(new StringReader(atlasFile.text), "", new MaterialsTextureLoader(this));
			atlas.FlipV();
			return atlas;
		} catch (Exception ex) {
			Debug.LogError("Error reading atlas file for atlas asset: " + name + "\n" + ex.Message + "\n" + ex.StackTrace, this);
			return null;
		}
	}
}

public class MaterialsTextureLoader : TextureLoader {
	AtlasAsset atlasAsset;
	
	public MaterialsTextureLoader (AtlasAsset atlasAsset) {
		this.atlasAsset = atlasAsset;
	}
	
	public void Load (AtlasPage page, String path) {
		String name = Path.GetFileNameWithoutExtension(path);
		Material material = null;
		foreach (Material other in atlasAsset.materials) {
			if (other.mainTexture == null) {
				Debug.LogError("Material is missing texture: " + other.name, other);
				return;
			}
			if (other.mainTexture.name == name) {
				material = other;
				break;
			}
		}
		if (material == null) {
			Debug.LogError("Material with texture name \"" + name + "\" not found for atlas asset: " + atlasAsset.name, atlasAsset);
			return;
		}
		page.rendererObject = material;
		page.width = material.mainTexture.width;
		page.height = material.mainTexture.height;
	}

	public void Unload (object texture) {
	}
}
