#pragma once

#include "event.h"
#include "log.h"

#include <GLFW/glfw3.h>
#include <imgui.h>

#include <string>

namespace Donut
{
    class Window
    {
    public:
        using EventCallbackFn = std::function<void(Event&)>;

        Window(const std::string& title, int width, int height);
        ~Window();

        bool should_close() const;
        void on_update()    const;

        void set_event_callback(const EventCallbackFn& callback)
        {
            m_event_handler.set_event_callback(callback);
        }

        EventHandler& get_event_handler() { return m_event_handler; }

        unsigned int get_width()  const { return m_width;  }
        unsigned int get_height() const { return m_height; }

        void* get_native_window()  const { return m_window; }

        void set_cursor_locked(bool locked);
        void set_cursor_visible(bool visible);
        bool is_cursor_locked()  const { return m_cursor_locked;  }
        bool is_cursor_visible() const { return m_cursor_visible; }
    
        void init_im_gui();
        void begin_im_gui_frame();
        void end_im_gui_frame();
    private:
        void init();
        void shutdown();

        void setup_im_gui_fonts();
        void apply_im_gui_theme();
        void shutdown_im_gui();
        
        static void glfw_error_callback(int error, const char* description);
        static void glfw_window_close_callback(GLFWwindow* window);
        static void glfw_window_size_callback(GLFWwindow* window, int width, int height);
        static void glfw_window_focus_callback(GLFWwindow* window, int focused);
        static void glfw_window_pos_callback(GLFWwindow* window, int xpos, int ypos);
        static void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
        static void glfw_char_callback(GLFWwindow* window, unsigned int keycode);
        static void glfw_mouse_button_callback(GLFWwindow* window, int button, int action, int mods);
        static void glfw_mouse_scroll_callback(GLFWwindow* window, double x_offset, double y_offset);
        static void glfw_cursor_pos_callback(GLFWwindow* window, double x_pos, double y_pos);
    private:
        GLFWwindow*  m_window;
        EventHandler m_event_handler;

        std::string  m_title;
        unsigned int m_width;
        unsigned int m_height;
        bool m_is_closed;
        bool m_cursor_locked  = false;
        bool m_cursor_visible = true;
        
        ImFont* m_main_font = nullptr;
        ImFont* m_small_font = nullptr;
        ImFont* m_large_font = nullptr;
    };
}