//
// Copyright (c) 2008-2014 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include "Precompiled.h"
#include "Context.h"
#include "FileSystem.h"
#include "Log.h"
#include "ResourceCache.h"
#include "Sprite2D.h"
#include "Texture2D.h"
#include "TmxFile2D.h"
#include "XMLFile.h"

#include "DebugNew.h"

namespace Urho3D
{

extern const float PIXEL_SIZE;

TmxLayer2D::TmxLayer2D(TmxFile2D* tmxFile, TileMapLayerType2D type) :
    tmxFile_(tmxFile),
    type_(type)
{

}

TmxLayer2D::~TmxLayer2D()
{
}

TmxFile2D* TmxLayer2D::GetTmxFile() const
{
    return tmxFile_;
}

bool TmxLayer2D::HasProperty(const String& name) const
{
    if (!propertySet_)
        return false;
    return propertySet_->HasProperty(name);
}

const String& TmxLayer2D::GetProperty(const String& name) const
{
    if (!propertySet_)
        return String::EMPTY;
    return propertySet_->GetProperty(name);
}

void TmxLayer2D::LoadInfo(const XMLElement& element)
{
    name_ = element.GetAttribute("name");
    width_ = element.GetInt("width");
    height_ = element.GetInt("height");
    if (element.HasAttribute("visible"))
        visible_ = element.GetInt("visible") != 0;
    else
        visible_ = true;
}

void TmxLayer2D::LoadPropertySet(const XMLElement& element)
{
    propertySet_ = new PropertySet2D();
    propertySet_->Load(element);
}

TmxTileLayer2D::TmxTileLayer2D(TmxFile2D* tmxFile) :
    TmxLayer2D(tmxFile, LT_TILE_LAYER)
{
}

bool TmxTileLayer2D::Load(const XMLElement& element, const TileMapInfo2D& info)
{
    LoadInfo(element);

    XMLElement dataElem = element.GetChild("data");
    if (!dataElem)
    {
        LOGERROR("Could not find data in layer");
        return false;
    }

    if (dataElem.HasAttribute("encoding") && dataElem.GetAttribute("encoding") != "xml")
    {
        LOGERROR("Encoding not support now");
        return false;
    }

    XMLElement tileElem = dataElem.GetChild("tile");
    tiles_.Resize(width_ * height_);

    for (int y = 0; y < height_; ++y)
    {
        for (int x = 0; x < width_; ++x)
        {
            if (!tileElem)
                return false;

            int gid = tileElem.GetInt("gid");
            if (gid > 0)
            {
                SharedPtr<Tile2D> tile(new Tile2D());
                tile->gid_ = gid;
                tile->sprite_ = tmxFile_->GetTileSprite(gid);
                tile->propertySet_ = tmxFile_->GetTilePropertySet(gid);
                tiles_[y * width_ + x] = tile;
            }

            tileElem = tileElem.GetNext("tile");
        }
    }

    if (element.HasChild("properties"))
        LoadPropertySet(element.GetChild("properties"));

    return true;
}

Tile2D* TmxTileLayer2D::GetTile(int x, int y) const
{
    if (x < 0 || x > width_ || y < 0 || y > height_)
        return 0;

    return tiles_[y * width_ + x];
}

TmxObjectGroup2D::TmxObjectGroup2D(TmxFile2D* tmxFile) :
    TmxLayer2D(tmxFile, LT_OBJECT_GROUP)
{
}

bool TmxObjectGroup2D::Load(const XMLElement& element, const TileMapInfo2D& info)
{
    LoadInfo(element);

    for (XMLElement objectElem = element.GetChild("object"); objectElem; objectElem = objectElem.GetNext("object"))
    {
        SharedPtr<TileMapObject2D> object(new TileMapObject2D());

        if (objectElem.HasAttribute("name"))
            object->name_ = objectElem.GetAttribute("name");
        if (objectElem.HasAttribute("type"))
            object->type_ = objectElem.GetAttribute("type");

        Vector2 position(objectElem.GetFloat("x"), objectElem.GetFloat("y"));

        if (objectElem.HasAttribute("width") || objectElem.HasAttribute("height"))
        {
            if (!objectElem.HasChild("ellipse"))
                object->objectType_ = OT_RECTANGLE;
            else
                object->objectType_ = OT_ELLIPSE;

            Vector2 size(objectElem.GetFloat("width"), objectElem.GetFloat("height"));

            object->position_ = info.ConvertPosition(Vector2(position.x_, position.y_ + size.y_));
            object->size_ = Vector2(size.x_ * PIXEL_SIZE, size.y_ * PIXEL_SIZE);
        }
        else if (objectElem.HasAttribute("gid"))
        {
            object->objectType_ = OT_TILE;
            object->position_ = info.ConvertPosition(position);
            object->gid_ = objectElem.GetInt("gid");
            object->sprite_ = tmxFile_->GetTileSprite(object->gid_);
        }
        else
        {
            XMLElement childElem = objectElem.GetChild();
            if (childElem.GetName() == "polygon")
                object->objectType_ = OT_POLYGON;
            else if (childElem.GetName() == "polyline")
                object->objectType_ = OT_POLYLINE;
            else
                return false;

            Vector<String> points = childElem.GetAttribute("points").Split(' ');
            object->points_.Resize(points.Size());

            for (unsigned i = 0; i < points.Size(); ++i)
            {
                points[i].Replace(',', ' ');
                Vector2 point = position + ToVector2(points[i]);
                object->points_[i] = info.ConvertPosition(point);
            }
        }

        if (objectElem.HasChild("properties"))
        {
            object->propertySet_ = new PropertySet2D();
            object->propertySet_->Load(objectElem.GetChild("properties"));
        }

        objects_.Push(object);
    }

    if (element.HasChild("properties"))
        LoadPropertySet(element.GetChild("properties"));

    return true;
}

TileMapObject2D* TmxObjectGroup2D::GetObject(unsigned index) const
{
    if (index >= objects_.Size())
        return 0;
    return objects_[index];
}


TmxImageLayer2D::TmxImageLayer2D(TmxFile2D* tmxFile) :
    TmxLayer2D(tmxFile, LT_IMAGE_LAYER)
{
}

bool TmxImageLayer2D::Load(const XMLElement& element, const TileMapInfo2D& info)
{
    LoadInfo(element);

    XMLElement imageElem = element.GetChild("image");
    if (!imageElem)
        return false;

    position_ = Vector2(0.0f, info.GetMapHeight());
    source_ = imageElem.GetAttribute("source");
    String textureFilePath = GetParentPath(tmxFile_->GetName()) + source_;
    ResourceCache* cache = tmxFile_->GetSubsystem<ResourceCache>();
    SharedPtr<Texture2D> texture(cache->GetResource<Texture2D>(textureFilePath));
    if (!texture)
    {
        LOGERROR("Could not load texture " + textureFilePath);
        return false;
    }

    sprite_ = new Sprite2D(tmxFile_->GetContext());
    sprite_->SetTexture(texture);
    sprite_->SetRectangle(IntRect(0, 0, texture->GetWidth(), texture->GetHeight()));
    // Set image hot spot at left top
    sprite_->SetHotSpot(Vector2(0.0f, 1.0f));

    if (element.HasChild("properties"))
        LoadPropertySet(element.GetChild("properties"));

    return true;
}

Sprite2D* TmxImageLayer2D::GetSprite() const
{
    return sprite_;
}

TmxFile2D::TmxFile2D(Context* context) :
    Resource(context)
{
}

TmxFile2D::~TmxFile2D()
{
    for (unsigned i = 0; i < layers_.Size(); ++i)
        delete layers_[i];
}

void TmxFile2D::RegisterObject(Context* context)
{
    context->RegisterFactory<TmxFile2D>();
}

bool TmxFile2D::BeginLoad(Deserializer& source)
{
    if (GetName().Empty())
        SetName(source.GetName());

    loadXMLFile_ = new XMLFile(context_);
    if (!loadXMLFile_->Load(source))
    {
        LOGERROR("Load XML failed " + source.GetName());
        loadXMLFile_.Reset();
        return false;
    }

    XMLElement rootElem = loadXMLFile_->GetRoot("map");
    if (!rootElem)
    {
        LOGERROR("Invalid tmx file " + source.GetName());
        loadXMLFile_.Reset();
        return false;
    }

    // If we're async loading, request the texture now. Finish during EndLoad().
    if (GetAsyncLoadState() == ASYNC_LOADING)
    {
        for (XMLElement tileSetElem = rootElem.GetChild("tileset"); tileSetElem; tileSetElem = tileSetElem.GetNext("tileset"))
        {
            // Tile set defined in TSX file
            if (tileSetElem.HasAttribute("source"))
            {
                String source = tileSetElem.GetAttribute("source");
                SharedPtr<XMLFile> tsxXMLFile = LoadTSXFile(source);
                if (!tsxXMLFile)
                    return false;

                tsxXMLFiles_[source] = tsxXMLFile;

                String textureFilePath = GetParentPath(GetName()) + tsxXMLFile->GetRoot("tileset").GetChild("image").GetAttribute("source");
                GetSubsystem<ResourceCache>()->BackgroundLoadResource<Texture2D>(textureFilePath, true, this);
            }
            else
            {
                String textureFilePath = GetParentPath(GetName()) + tileSetElem.GetChild("image").GetAttribute("source");
                GetSubsystem<ResourceCache>()->BackgroundLoadResource<Texture2D>(textureFilePath, true, this);
            }
        }

        for (XMLElement imageLayerElem = rootElem.GetChild("imagelayer"); imageLayerElem; imageLayerElem = imageLayerElem.GetNext("imagelayer"))
        {
            String textureFilePath = GetParentPath(GetName()) + imageLayerElem.GetChild("image").GetAttribute("source");
            GetSubsystem<ResourceCache>()->BackgroundLoadResource<Texture2D>(textureFilePath, true, this);
        }
    }

    return true;
}

bool TmxFile2D::EndLoad()
{
    if (!loadXMLFile_)
        return false;

    XMLElement rootElem = loadXMLFile_->GetRoot("map");
    String version = rootElem.GetAttribute("version");
    if (version != "1.0")
    {
        LOGERROR("Invalid version");
        return false;
    }

    String orientation = rootElem.GetAttribute("orientation");
    if (orientation == "orthogonal")
        info_.orientation_ = O_ORTHOGONAL;
    else if (orientation == "isometric")
        info_.orientation_ = O_ISOMETRIC;
    else if (orientation == "staggered")
        info_.orientation_ = O_STAGGERED;
    else
    {
        LOGERROR("Unsupported orientation type " + orientation);
        return false;
    }

    info_.width_ = rootElem.GetInt("width");
    info_.height_ = rootElem.GetInt("height");
    info_.tileWidth_ = rootElem.GetFloat("tilewidth") * PIXEL_SIZE;
    info_.tileHeight_ = rootElem.GetFloat("tileheight") * PIXEL_SIZE;

    for (unsigned i = 0; i < layers_.Size(); ++i)
        delete layers_[i];
    layers_.Clear();

    for (XMLElement childElement = rootElem.GetChild(); childElement; childElement = childElement.GetNext())
    {
        bool ret = true;
        String name = childElement.GetName();
        if (name == "tileset")
            ret = LoadTileSet(childElement);
        else if (name == "layer")
        {
            TmxTileLayer2D* tileLayer = new TmxTileLayer2D(this);
            ret = tileLayer->Load(childElement, info_);

            layers_.Push(tileLayer);
        }
        else if (name == "objectgroup")
        {
            TmxObjectGroup2D* objectGroup = new TmxObjectGroup2D(this);
            ret = objectGroup->Load(childElement, info_);

            layers_.Push(objectGroup);

        }
        else if (name == "imagelayer")
        {
            TmxImageLayer2D* imageLayer = new TmxImageLayer2D(this);
            ret = imageLayer->Load(childElement, info_);

            layers_.Push(imageLayer);
        }

        if (!ret)
        {
            loadXMLFile_.Reset();
            tsxXMLFiles_.Clear();
            return false;
        }
    }

    loadXMLFile_.Reset();
    tsxXMLFiles_.Clear();
    return true;
}

Sprite2D* TmxFile2D::GetTileSprite(int gid) const
{
    HashMap<int, SharedPtr<Sprite2D> >::ConstIterator i = gidToSpriteMapping_.Find(gid);
    if (i == gidToSpriteMapping_.End())
        return 0;

    return i->second_;
}

PropertySet2D* TmxFile2D::GetTilePropertySet(int gid) const
{
    HashMap<int, SharedPtr<PropertySet2D> >::ConstIterator i = gidToPropertySetMapping_.Find(gid);
    if (i == gidToPropertySetMapping_.End())
        return 0;
    return i->second_;
}

const TmxLayer2D* TmxFile2D::GetLayer(unsigned index) const
{
    if (index >= layers_.Size())
        return 0;

    return layers_[index];
}


SharedPtr<XMLFile> TmxFile2D::LoadTSXFile(const String& source)
{
    String tsxFilePath = GetParentPath(GetName()) + source;
    SharedPtr<File> tsxFile = GetSubsystem<ResourceCache>()->GetFile(tsxFilePath);
    SharedPtr<XMLFile> tsxXMLFile(new XMLFile(context_));
    if (!tsxFile || !tsxXMLFile->Load(*tsxFile))
    {
        LOGERROR("Load TSX file failed " + tsxFilePath);
        return SharedPtr<XMLFile>();
    }

    return tsxXMLFile;
}

bool TmxFile2D::LoadTileSet(const XMLElement& element)
{
    int firstgid = element.GetInt("firstgid");

    XMLElement tileSetElem;
    if (element.HasAttribute("source"))
    {
        String source = element.GetAttribute("source");
        HashMap<String, SharedPtr<XMLFile> >::Iterator i = tsxXMLFiles_.Find(source);
        if (i == tsxXMLFiles_.End())
        {
            SharedPtr<XMLFile> tsxXMLFile = LoadTSXFile(source);
            if (!tsxXMLFile)
                return false;

            // Add to napping to avoid release
            tsxXMLFiles_[source] = tsxXMLFile;

            tileSetElem = tsxXMLFile->GetRoot("tileset");
        }
        else
            tileSetElem = i->second_->GetRoot("tileset");
    }
    else
        tileSetElem = element;

    XMLElement imageElem = tileSetElem.GetChild("image");
    String textureFilePath = GetParentPath(GetName()) + imageElem.GetAttribute("source");
    ResourceCache* cache = GetSubsystem<ResourceCache>();
    SharedPtr<Texture2D> texture(cache->GetResource<Texture2D>(textureFilePath));
    if (!texture)
    {
        LOGERROR("Could not load texture " + textureFilePath);
        return false;
    }

    tileSetTextures_.Push(texture);

    int tileWidth = tileSetElem.GetInt("tilewidth");
    int tileHeight = tileSetElem.GetInt("tileheight");
    int spacing = tileSetElem.GetInt("spacing");
    int margin = tileSetElem.GetInt("margin");
    int imageWidth = imageElem.GetInt("width");
    int imageHeight = imageElem.GetInt("height");

    // Set hot spot at left bottom
    Vector2 hotSpot(0.0f, 0.0f);
    if (tileSetElem.HasChild("tileoffset"))
    {
        XMLElement offsetElem = tileSetElem.GetChild("tileoffset");
        hotSpot.x_ += offsetElem.GetFloat("x") / (float)tileWidth;
        hotSpot.y_ += offsetElem.GetFloat("y") / (float)tileHeight;
    }

    int gid = firstgid;
    for (int y = margin; y + tileHeight <= imageHeight - margin; y += tileHeight + spacing)
    {
        for (int x = margin; x + tileWidth <= imageWidth - margin; x += tileWidth + spacing)
        {
            SharedPtr<Sprite2D> sprite(new Sprite2D(context_));
            sprite->SetTexture(texture);
            sprite->SetRectangle(IntRect(x, y, x + tileWidth, y + tileHeight));
            sprite->SetHotSpot(hotSpot);

            gidToSpriteMapping_[gid++] = sprite;
        }
    }

    for (XMLElement tileElem = tileSetElem.GetChild("tile"); tileElem; tileElem = tileElem.GetNext("tile"))
    {
        if (tileElem.HasChild("properties"))
        {
            SharedPtr<PropertySet2D> propertySet(new PropertySet2D());
            propertySet->Load(tileElem.GetChild("properties"));
            gidToPropertySetMapping_[firstgid + tileElem.GetInt("id")] = propertySet;
        }
    }

    return true;
}

}