Dicewars-Siedler/src/engine/renderer/loader/AssetManager.cpp

//
// Created by sebastian on 08.02.26.
//

#include "AssetManager.h"

#include <cassert>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <utility>

#include "json.hpp"
#include "OBJLoader.h"
#include "spdlog/spdlog.h"

namespace fs = std::filesystem;
using namespace nlohmann;

std::shared_ptr<TexturedModel> AssetManager::loadModel(const std::string &name, const std::string &objPath,  const std::string &texturePath, Loader &loader) {
    if (models.contains(name)) {
        return models[name];
    }

    auto model = OBJLoader::loadModel(objPath, texturePath, loader);
    models[name] = model;
    return model;
}

std::shared_ptr<TexturedModel> AssetManager::getModel(const std::string &name) {
    assert(models.contains(name) && "Model not found!");
    return models.at(name);
}

void AssetManager::insertGeneratedModel(const std::string &name, std::shared_ptr<TexturedModel> model) {
    assert(!models.contains(name) && "Model already exists!");
    models[name] = std::move(model);
}

void AssetManager::loadAsset(const std::string &assetPath, Loader &loader) {
    json assetConfiguration = readJsonFile(assetPath);
    ModelStages modelStages;
    std::string baseDir = std::filesystem::path(assetPath).parent_path().string();
    for (const auto& modelStage : assetConfiguration["modelStages"]) {
        auto name = modelStage["name"].get<std::string>();
        auto objPath = modelStage["filename"].get<std::string>();
        const auto conditionKey = modelStage["conditionKey"].get<std::string>();
        const float min = modelStage["minValue"].get<float>();
        const float max = modelStage["maxValue"].get<float>();

        std::filesystem::path fullObjPath = std::filesystem::path(baseDir) / std::filesystem::path(objPath);
        const std::shared_ptr<TexturedModel> model = loadModel(name, fullObjPath, "", loader);
        const auto condition = ModelStageCondition(conditionKey, min, max);
        modelStages.addModelStage(ModelStageConfiguration(model, name, condition));
    }
    modelsWithStages[assetConfiguration["name"].get<std::string>()] = std::make_shared<ModelStages>(modelStages);
}

std::shared_ptr<ModelStages> AssetManager::getModelStages(const std::string &modelName) {
    if (modelsWithStages.contains(modelName)) {
        return modelsWithStages[modelName];
    }
    return nullptr;
}

std::shared_ptr<ModelStageConfiguration> AssetManager::getModelStageConfiguration(const std::string &modelName, const std::string &stageName) {
    if (const auto modelStages = getModelStages(modelName)) {
        return std::make_shared<ModelStageConfiguration>(modelStages->getModelStageConfiguration(stageName));
    }
    return nullptr;
}

std::shared_ptr<ModelTexture> AssetManager::loadTexture(const std::string& name, const std::string &texturePath, Loader &loader) {
    if (textures.contains(name)) {
        return textures[name];
    }

    auto texture = std::make_shared<ModelTexture>(loader.loadTextureFromFile(texturePath));
    textures[name] = texture;
    return texture;
}

std::shared_ptr<ModelTexture> AssetManager::getTexture(const std::string &name) {
    assert(textures.contains(name) && "Texture not found!");
    return textures.at(name);
}

std::shared_ptr<UiTheme> AssetManager::getUiTheme(const std::string &themeName) {
    assert(uiThemes.contains(themeName) && "Theme not found!");
    return uiThemes.at(themeName);
}

std::shared_ptr<UiTheme> AssetManager::loadUiTheme(const std::string &themeName, const std::string &themePath) {
    if (!uiThemes.contains(themeName)) {
        json themeConfiguration = readJsonFile(themePath);
        if (themeConfiguration.contains("font")) {
            auto fontData = themeConfiguration["font"];
            if (fontData.contains("path") && fontData.contains("sizes")) {
                auto fontSizes = fontData["sizes"];
                if (fontSizes.contains("small") && fontSizes.contains("medium") && fontSizes.contains("large")) {
                    std::string fontPath = fontData["path"].get<std::string>();
                    auto theme = std::make_shared<UiTheme>(
                        std::make_unique<Font>(fontPath, fontSizes["small"]),
                        std::make_unique<Font>(fontPath, fontSizes["medium"]),
                        std::make_unique<Font>(fontPath, fontSizes["large"])
                    );
                    uiThemes[themeName] = theme;
                    return theme;
                } else {
                    std::cerr << "Required Font sizes not found in theme configuration!" << std::endl;
                    return nullptr;
                }
            } else {
                std::cerr << "Required Font path not found in theme configuration!" << std::endl;
                return nullptr;
            }
        } else {
            std::cerr << "Required Font configuration not found in theme configuration!" << std::endl;
            return nullptr;
        }
    } else {
        return uiThemes[themeName];
    }
}

void AssetManager::insertLoadedTexture(const std::string &name, const Texture2D &texture) {
    if (textures.contains(name)) {
        spdlog::warn("Texture '{}' already exists, skipping insert", name);
        return;
    }

    textures[name] = std::make_shared<ModelTexture>(texture.id);
    spdlog::debug("Texture '{}' inserted successfully", name);
}

void AssetManager::insertTexturedModel(const std::string &name, const TexturedModel &textured_model) {
    if (models.contains(name)) {
        spdlog::warn("Model '{}' already exists, skipping insert", name);
        return;
    }

    models[name] = std::make_shared<TexturedModel>(textured_model);
    spdlog::debug("Model '{}' inserted successfully", name);
}

void AssetManager::insertModelStages(const std::string &name, ModelStages modelStages) {
    if (modelsWithStages.contains(name)) {
        spdlog::warn("Asset '{}' already has stages, skipping insert", name);
        return;
    }

    modelsWithStages[name] = std::make_shared<ModelStages>(modelStages);
}


json AssetManager::readJsonFile(const std::string &path) {
    if (fs::exists(path)) {
        std::ifstream filestream(path);
        json j;
        filestream >> j;
        return j;
    }
    return json::object();
}