IAEngine/Src/Editor/imp/cpp/UI/View/Asset.cpp

// IAEngine: 2D Game Engine by IA
// Copyright (C) 2025 IASoft (PVT) LTD (oss@iasoft.dev)
//
// 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 <https://www.gnu.org/licenses/>.

#include <UI/View/Asset.hpp>

#include <IAEngine/Asset/AssetManager.hpp>
#include <RenderCore/RenderCore.hpp>

#include <Editor.hpp>

namespace ia::iae
{
    VOID View_Asset::Initialize()
    {
        SetName("Asset");
        SetIcon(ICON_FA_STAR);
    }

    VOID View_Asset::Terminate()
    {
    }

    VOID View_Asset::Render()
    {
        PreRender();

        if (!m_asset)
        {
            PostRender();
            return;
        }

        STATIC CHAR NAME_BUFFER[256];

        memcpy(NAME_BUFFER, m_assetName.c_str(), m_assetName.size() + 1);
        ImGui::Text("Name: ");
        ImGui::SameLine();
        ImGui::InputText("##name", NAME_BUFFER, sizeof(NAME_BUFFER));
        m_assetName = NAME_BUFFER;

        DrawAssetTypePicker();

        switch (m_asset->GetType())
        {
        case EAssetType::TEXTURE:
            RenderTextureAsset();
            break;

        case EAssetType::SPRITE:
            RenderSpriteAsset();
            break;

        case EAssetType::TILESHEET:
            RenderTileSheetAsset();
            break;

        case EAssetType::SPRITESHEET:
            RenderSpriteSheetAsset();
            break;

        case EAssetType::INVALID:
        case EAssetType::SOUND:
        case EAssetType::SCENE:
        case EAssetType::PLUGIN:
        case EAssetType::PACKAGE:
            break;
        }

        PostRender();
    }

    VOID View_Asset::Update()
    {
    }

    VOID View_Asset::OnEvent(IN SDL_Event *event)
    {
    }

    VOID View_Asset::Open(IN String assetName)
    {
        m_assetName = assetName;
        const auto asset = AssetManager::GetAssetByName<Asset_Texture>(m_assetName);
        m_assetImageHandle = RDC::BakeTexture(asset->GetHandle()->ImagePtr);
        m_assetImageExtent = {asset->GetHandle()->ImagePtr->Width, asset->GetHandle()->ImagePtr->Height};
        m_asset = asset;
        m_assetType = asset->GetType();
    }

    VOID View_Asset::Close()
    {
        m_assetName = "";
        m_asset = nullptr;
        m_assetImageHandle = 0;
        m_assetImageExtent = {};
        m_assetType = EAssetType::INVALID;
    }

    VOID View_Asset::RenderTextureAsset()
    {
        const auto asset = (Asset_Texture *) m_asset;
        DrawAssetImage(0.75f, {0, 0});
    }

    VOID View_Asset::RenderSpriteAsset()
    {
        const auto asset = (Asset_Sprite *) m_asset;
        DrawAssetImage(0.75f, {0, 0});
    }

    VOID View_Asset::RenderTileSheetAsset()
    {
        const auto asset = (Asset_TileSheet *) m_asset;

        ImGui::Text("Tile Width: ");
        ImGui::SameLine();
        ImGui::InputInt("##TileWidth", &asset->TileWidth());
        if (asset->TileWidth() < 1)
            asset->TileWidth() = 1;
        if (asset->TileWidth() > m_assetImageExtent.x)
            asset->TileWidth() = m_assetImageExtent.x;

        ImGui::Text("Tile Height: ");
        ImGui::SameLine();
        ImGui::InputInt("##TileHeight", &asset->TileHeight());
        if (asset->TileHeight() < 1)
            asset->TileHeight() = 1;
        if (asset->TileHeight() > m_assetImageExtent.y)
            asset->TileHeight() = m_assetImageExtent.y;

        DrawAssetImage(0.75f, {asset->TileWidth(), asset->TileHeight()});
    }

    VOID View_Asset::RenderSpriteSheetAsset()
    {
        const auto asset = (Asset_SpriteSheet *) m_asset;
    }

    VOID View_Asset::DrawAssetImage(IN FLOAT32 relativeWidth, IN IVec2 gridSize)
    {
        ImVec2 base_pos = ImGui::GetCursorScreenPos();

        const auto ImageWidth = m_extent.x * relativeWidth;
        const auto aspectRatio =
            static_cast<FLOAT32>(m_assetImageExtent.y) / static_cast<FLOAT32>(m_assetImageExtent.x);
        const auto ImageHeight = aspectRatio * ImageWidth;

        ImGui::Image((ImTextureRef) m_assetImageHandle, {ImageWidth, ImageHeight});

        if((!gridSize.x) || (!gridSize.y))
            return;

        gridSize.x *= ImageWidth/m_assetImageExtent.x;
        gridSize.y *= ImageHeight/m_assetImageExtent.y;

        ImDrawList *draw_list = ImGui::GetWindowDrawList();

        auto gridCountX = ImageWidth / gridSize.x;
        auto gridCountY = ImageHeight / gridSize.y;

        ImU32 grid_color = IM_COL32(200, 200, 200, 50);
        float grid_thickness = 1.0f;

        ImGui::Dummy(ImVec2(ImageWidth, ImageHeight));

        for (int i = 0; i <= gridCountX; ++i)
        {
            ImVec2 p1 = ImVec2(base_pos.x + i * gridSize.x, base_pos.y);
            ImVec2 p2 = ImVec2(base_pos.x + i * gridSize.x, base_pos.y + ImageHeight);
            draw_list->AddLine(p1, p2, grid_color, grid_thickness);
        }

        for (int i = 0; i <= gridCountY; ++i)
        {
            ImVec2 p1 = ImVec2(base_pos.x, base_pos.y + i * gridSize.y);
            ImVec2 p2 = ImVec2(base_pos.x + ImageWidth, base_pos.y + i * gridSize.y);
            draw_list->AddLine(p1, p2, grid_color, grid_thickness);
        }
    }

    VOID View_Asset::DrawAssetTypePicker()
    {
        ImGui::Text("Asset Type: ");
        ImGui::SameLine();
        ImGui::Combo("##", (INT32 *) &m_assetType, "None\0Texture\0Sprite\0TileSheet\0SpriteSheet\0");
        if (m_assetType != m_asset->GetType())
        {
            ImGui::SameLine();
            if (ImGui::Button("Apply"))
            {
                if (m_assetType == EAssetType::INVALID)
                {
                    Editor::Instance().RemoveFromAssets(m_assetName);
                    Close();
                    UI::CloseAssetView();
                }
                m_asset = AssetManager::ChangeAssetType(m_assetName, m_assetType);
            }
        }
    }
} // namespace ia::iae