/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2020                                                               *
 *                                                                                       *
 * 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:                                                                           *
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 * 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    *
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 ****************************************************************************************/

#include <modules/base/rendering/renderableplaneimagelocal.h>

#include <modules/base/basemodule.h>
#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <ghoul/filesystem/file.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/logging/logmanager.h>
#include <ghoul/misc/crc32.h>
#include <ghoul/opengl/texture.h>
#include <fstream>

namespace {
    constexpr const char* KeyLazyLoading = "LazyLoading";

    constexpr openspace::properties::Property::PropertyInfo TextureInfo = {
        "Texture",
        "Texture",
        "This value specifies an image that is loaded from disk and is used as a texture "
        "that is applied to this plane. This image has to be square."
    };

    constexpr openspace::properties::Property::PropertyInfo RenderableTypeInfo = {
       "RenderableType",
       "RenderableType",
       "This value specifies if the plane should be rendered in the Background,"
       "Opaque, Transparent, or Overlay rendering step."
    };
} // namespace

namespace openspace {

documentation::Documentation RenderablePlaneImageLocal::Documentation() {
    using namespace documentation;
    return {
        "Renderable Plane Image Local",
        "base_renderable_plane_image_local",
        {
            {
                TextureInfo.identifier,
                new StringVerifier,
                Optional::No,
                TextureInfo.description
            },
            {
                RenderableTypeInfo.identifier,
                new StringVerifier,
                Optional::Yes,
                RenderableTypeInfo.description
            },
            {
                KeyLazyLoading,
                new BoolVerifier,
                Optional::Yes,
                "If this value is set to 'true', the image for this plane will not be "
                "loaded at startup but rather when image is shown for the first time. "
                "Additionally, if the plane is hidden, the image will automatically be "
                "unloaded"
            }
        }
    };
}

RenderablePlaneImageLocal::RenderablePlaneImageLocal(const ghoul::Dictionary& dictionary)
    : RenderablePlane(dictionary)
    , _texturePath(TextureInfo)
{
    documentation::testSpecificationAndThrow(
        Documentation(),
        dictionary,
        "RenderablePlaneImageLocal"
    );

    addProperty(_blendMode);

    _texturePath = absPath(dictionary.value<std::string>(TextureInfo.identifier));
    _textureFile = std::make_unique<ghoul::filesystem::File>(_texturePath);

    addProperty(_texturePath);
    _texturePath.onChange([this]() {loadTexture(); });
    _textureFile->setCallback(
        [this](const ghoul::filesystem::File&) { _textureIsDirty = true; }
    );

    if (dictionary.hasKey(RenderableTypeInfo.identifier)) {
        std::string renderType = dictionary.value<std::string>(
            RenderableTypeInfo.identifier
        );
        if (renderType == "Background") {
            setRenderBin(Renderable::RenderBin::Background);
        }
        else if (renderType == "Opaque") {
            setRenderBin(Renderable::RenderBin::Opaque);
        }
        else if (renderType == "PreDeferredTransparent") {
            setRenderBin(Renderable::RenderBin::PreDeferredTransparent);
        }
        else if (renderType == "PostDeferredTransparent") {
            setRenderBin(Renderable::RenderBin::PostDeferredTransparent);
        }
        else if (renderType == "Overlay") {
            setRenderBin(Renderable::RenderBin::Overlay);
        }
    }
    else {
        setRenderBin(Renderable::RenderBin::Opaque);
    }

    if (dictionary.hasKey(KeyLazyLoading)) {
        _isLoadingLazily = dictionary.value<bool>(KeyLazyLoading);

        if (_isLoadingLazily) {
            _enabled.onChange([this]() {
                if (!_enabled) {
                    BaseModule::TextureManager.release(_texture);
                    _texture = nullptr;
                }
                if (_enabled) {
                    _textureIsDirty = true;
                }
            });
        }
    }
}

bool RenderablePlaneImageLocal::isReady() const {
    return RenderablePlane::isReady();
}

void RenderablePlaneImageLocal::initializeGL() {
    RenderablePlane::initializeGL();

    if (!_isLoadingLazily) {
        loadTexture();
    }
}

void RenderablePlaneImageLocal::deinitializeGL() {
    _textureFile = nullptr;

    BaseModule::TextureManager.release(_texture);
    RenderablePlane::deinitializeGL();
}

void RenderablePlaneImageLocal::bindTexture() {
    _texture->bind();
}

void RenderablePlaneImageLocal::update(const UpdateData& data) {
    RenderablePlane::update(data);

    if (_textureIsDirty) {
        loadTexture();
        _textureIsDirty = false;
    }
}

void RenderablePlaneImageLocal::loadTexture() {
    if (!_texturePath.value().empty()) {
        ghoul::opengl::Texture* t = _texture;

        unsigned int hash = ghoul::hashCRC32File(_texturePath);

        _texture = BaseModule::TextureManager.request(
            std::to_string(hash),
            [path = _texturePath]() -> std::unique_ptr<ghoul::opengl::Texture> {
                std::unique_ptr<ghoul::opengl::Texture> texture =
                    ghoul::io::TextureReader::ref().loadTexture(absPath(path));

                LDEBUGC(
                    "RenderablePlaneImageLocal",
                    fmt::format("Loaded texture from '{}'", absPath(path))
                );
                texture->uploadTexture();
                texture->setFilter(ghoul::opengl::Texture::FilterMode::LinearMipMap);
                texture->purgeFromRAM();

                return texture;
            }
        );

        BaseModule::TextureManager.release(t);

        _textureFile = std::make_unique<ghoul::filesystem::File>(_texturePath);
        _textureFile->setCallback(
            [&](const ghoul::filesystem::File&) { _textureIsDirty = true; }
        );
    }
}

} // namespace openspace