#include "window_manager.h"

#include <SDL3/SDL_init.h>     // for SDL_Init
#include <SDL3/SDL_error.h>    // for SDL_GetError
#include <SDL3/SDL_video.h>    // for SDL_CreateWindow, SDL_GetDisplayBounds
#include <iostream>            // for cout

// Incluir backends específicos
// TODO: Reactivar cuando se implemente compilación Objective-C++
// #ifdef __APPLE__
//     #include "backends/metal_renderer.h"
// #endif

#if defined(_WIN32) || defined(__linux__)
    #include "backends/vulkan_renderer.h"
#endif

// Fallback SDL siempre disponible
#include "backends/sdl_renderer.h"

namespace vibe4 {

WindowManager::WindowManager() = default;

WindowManager::~WindowManager() {
    shutdown();
}

bool WindowManager::initialize(const char* title, int width, int height, int zoom) {
    logical_width_ = width;
    logical_height_ = height;
    current_zoom_ = zoom;

    // Inicializar SDL
    if (!SDL_Init(SDL_INIT_VIDEO)) {
        std::cout << "¡SDL no se pudo inicializar! Error: " << SDL_GetError() << std::endl;
        return false;
    }

    // Crear ventana SDL
    if (!createSDLWindow(title, width * zoom, height * zoom)) {
        return false;
    }

    // Detectar y crear el mejor backend disponible
    BackendType backend_type = detectBestBackend();
    renderer_ = createRenderer(backend_type);

    if (!renderer_) {
        std::cout << "¡No se pudo crear ningún backend de renderizado!" << std::endl;
        return false;
    }

    // Inicializar el renderer
    if (!renderer_->initialize(window_, width, height)) {
        std::cout << "¡No se pudo inicializar el backend " << renderer_->getBackendName() << "!" << std::endl;
        return false;
    }

    std::cout << "Backend de renderizado inicializado: " << renderer_->getBackendName() << std::endl;
    return true;
}

void WindowManager::shutdown() {
    if (renderer_) {
        renderer_->shutdown();
        renderer_.reset();
    }

    if (window_) {
        SDL_DestroyWindow(window_);
        window_ = nullptr;
    }

    SDL_Quit();
}

bool WindowManager::createSDLWindow(const char* title, int width, int height) {
    Uint32 window_flags = SDL_WINDOW_OPENGL; // Empezamos con OpenGL como base

    // Agregar flags específicos dependiendo del backend que vayamos a usar
    BackendType backend_type = detectBestBackend();
    switch (backend_type) {
        case BackendType::METAL:
            window_flags = SDL_WINDOW_METAL;
            break;
        case BackendType::VULKAN:
            window_flags = SDL_WINDOW_VULKAN;
            break;
        case BackendType::SDL:
        default:
            window_flags = SDL_WINDOW_OPENGL;
            break;
    }

    window_ = SDL_CreateWindow(title, width, height, window_flags);
    if (!window_) {
        std::cout << "¡No se pudo crear la ventana! Error: " << SDL_GetError() << std::endl;
        return false;
    }

    return true;
}

BackendType WindowManager::detectBestBackend() const {
    // TODO: Reactivar Metal cuando se implemente compilación Objective-C++
#ifdef __APPLE__
    return BackendType::SDL;    // Temporalmente usar SDL en macOS
#elif defined(_WIN32) || defined(__linux__)
    return BackendType::VULKAN; // Windows/Linux usan Vulkan
#else
    return BackendType::SDL;    // Fallback para otras plataformas
#endif
}

std::unique_ptr<RendererInterface> WindowManager::createRenderer(BackendType type) {
    switch (type) {
        // TODO: Reactivar cuando se implemente compilación Objective-C++
        // #ifdef __APPLE__
        // case BackendType::METAL:
        //     return std::make_unique<MetalRenderer>();
        // #endif

#if defined(_WIN32) || defined(__linux__)
        case BackendType::VULKAN:
            return std::make_unique<VulkanRenderer>();
#endif

        case BackendType::SDL:
        default:
            return std::make_unique<SDLRenderer>();
    }
}

void WindowManager::setTitle(const char* title) {
    if (window_) {
        SDL_SetWindowTitle(window_, title);
    }
}

bool WindowManager::setFullscreen(bool enable) {
    if (!window_) return false;

    bool result = SDL_SetWindowFullscreen(window_, enable);
    if (result) {
        fullscreen_enabled_ = enable;
        if (enable) {
            real_fullscreen_enabled_ = false; // Solo uno puede estar activo
        }
    }
    return result;
}

bool WindowManager::setRealFullscreen(bool enable) {
    if (!window_) return false;

    bool result = SDL_SetWindowFullscreen(window_, enable);
    if (result) {
        real_fullscreen_enabled_ = enable;
        if (enable) {
            fullscreen_enabled_ = false; // Solo uno puede estar activo
        }
    }
    return result;
}

void WindowManager::setZoom(int zoom) {
    if (zoom < MIN_ZOOM || zoom > MAX_ZOOM) return;

    current_zoom_ = zoom;
    updateWindowSize();
}

void WindowManager::updateWindowSize() {
    if (!window_ || fullscreen_enabled_ || real_fullscreen_enabled_) return;

    int new_width = logical_width_ * current_zoom_;
    int new_height = logical_height_ * current_zoom_;

    SDL_SetWindowSize(window_, new_width, new_height);

    if (renderer_) {
        renderer_->resize(logical_width_, logical_height_);
    }
}

int WindowManager::calculateMaxZoom() const {
    SDL_Rect display_bounds;
    if (!SDL_GetDisplayBounds(SDL_GetDisplayForWindow(window_), &display_bounds)) {
        return MIN_ZOOM;
    }

    int max_width = display_bounds.w - DESKTOP_MARGIN * 2;
    int max_height = display_bounds.h - DESKTOP_MARGIN * 2 - DECORATION_HEIGHT;

    int max_zoom_x = max_width / logical_width_;
    int max_zoom_y = max_height / logical_height_;

    int calculated_max = std::min(max_zoom_x, max_zoom_y);
    return std::min(calculated_max, MAX_ZOOM);
}

void WindowManager::zoomIn() {
    int max_zoom = calculateMaxZoom();
    if (current_zoom_ < max_zoom) {
        setZoom(current_zoom_ + 1);
    }
}

void WindowManager::zoomOut() {
    if (current_zoom_ > MIN_ZOOM) {
        setZoom(current_zoom_ - 1);
    }
}

void WindowManager::getSize(int& width, int& height) const {
    if (window_) {
        SDL_GetWindowSize(window_, &width, &height);
    } else {
        width = height = 0;
    }
}

void WindowManager::getLogicalSize(int& width, int& height) const {
    width = logical_width_;
    height = logical_height_;
}

BackendType WindowManager::getBackendType() const {
    return renderer_ ? renderer_->getBackendType() : BackendType::SDL;
}

const char* WindowManager::getBackendName() const {
    return renderer_ ? renderer_->getBackendName() : "None";
}

} // namespace vibe4