#include "App.hpp"

#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>

#include <backends/imgui_impl_glfw.h>
#include <backends/imgui_impl_opengl3.h>
#include <glad/glad.h>
#include <imgui.h>
#include <iostream>
#include <string>

#define IMGUI_IMPL_OPENGL_LOADER_CUSTOM 1
#include <backends/imgui_impl_glfw.cpp>
#include <backends/imgui_impl_opengl3.cpp>

static void GlfwErrorCallback(int error, const char* description) {
    fprintf(stderr, "Glfw Error %d: %s\n", error, description);
}

static void GlfwKeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods) {
    GLFWkeyboard* keyboard = glfwGetLastActiveKeyboard();
    if (keyboard) {
        App* app = static_cast<App*>(glfwGetWindowUserPointer(window));
        app->HandleKey(keyboard, key, action);
    }
}

int main() {
    if (!glfwInit()) {
        return -1;
    }

    glfwSetErrorCallback(&GlfwErrorCallback);

    // Decide GL+GLSL versions
#if defined(IMGUI_IMPL_OPENGL_ES2)
    // GL ES 2.0 + GLSL 100
    const char* glsl_version = "#version 100";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
    glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
#elif defined(__APPLE__)
    // GL 3.2 + GLSL 150
    const char* glsl_version = "#version 150";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // 3.2+ only
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // Required on Mac
#else
    // GL 3.0 + GLSL 130
    const char* glsl_version = "#version 130";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
#endif

    App app;

    GLFWwindow* window = glfwCreateWindow(1280, 720, "ImGui Command Palette Example", nullptr, nullptr);
    if (window == nullptr) {
        return -2;
    }

    glfwSetWindowUserPointer(window, &app);

    // Window callbacks are retained by ImGui GLFW backend
    glfwSetKeyCallback(window, &GlfwKeyCallback);

    glfwMakeContextCurrent(window);
    glfwSwapInterval(1);

    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        return -3;
    }

    IMGUI_CHECKVERSION();
    ImGui::CreateContext();

    ImGui_ImplGlfw_InitForOpenGL(window, true);
    ImGui_ImplOpenGL3_Init(glsl_version);

    app.Init();
    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();

        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();

        app.Show();

        ImGui::Render();
        int display_w, display_h;
        glfwGetFramebufferSize(window, &display_w, &display_h);
        glViewport(0, 0, display_w, display_h);
        auto clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
        glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

        glfwSwapBuffers(window);
    }
    app.Shutdown();

    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();

    ImGui::DestroyContext();

    glfwDestroyWindow(window);
    glfwTerminate();

    return 0;
}