#include "myshader.hh"
#include "stb_image_wrap.h"
#include <GLFW/glad/glad.h>
#include <GLFW/glfw3.h>
#include <cstddef>
#include <glm/ext/matrix_clip_space.hpp>
#include <glm/ext/matrix_transform.hpp>
#include <glm/fwd.hpp>
#include <glm/glm.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <glm/trigonometric.hpp>
#include <iostream>
#include "mesh.hh"
#include "camera.hh"

constexpr unsigned int WINDOW_WIDTH  = 800;
constexpr unsigned int WINDOW_HEIGHT = 600;

float     mix_nb      = 0.2f;
glm::vec3 cameraPos   = glm::vec3(0.0f, 0.0f, 3.0f);
glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);
glm::vec3 cameraUp    = glm::vec3(0.0f, 1.0f, 0.0f);
float     deltaTime   = 0.0f; // 当前帧与上一帧的时间差
float     lastFrame   = 0.0f; // 上一帧的时间
float     lastX       = 400.0f;
float     lastY       = 300.0f;
float     yaw         = -90.0f;
float     pitch       = 0.0f;
float     fov         = 45.0f;
bool      firstMouse  = true;
Camera    camera(glm::vec3(0.0f, 0.0f, 3.0f));

void mouse_callback(GLFWwindow* window, double xpos, double ypos) {
    if (firstMouse) {
        lastX      = xpos;
        lastY      = ypos;
        firstMouse = false;
    }

    float xoffset = xpos - lastX;
    float yoffset = lastY - ypos;
    lastX         = xpos;
    lastY         = ypos;

    camera.process_mouse_movement(xoffset, yoffset);
    // float sensitivity = 0.05f;
    // xoffset *= sensitivity;
    // yoffset *= sensitivity;
    //
    // pitch += yoffset;
    // yaw += xoffset;
    //
    // if (pitch > 89.0f) {
    //     pitch = 89.0f;
    // }
    // if (pitch < -89.0f) {
    //     pitch = -89.0f;
    // }
    //
    // glm::vec3 front;
    // front.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
    // front.y = sin(glm::radians(pitch));
    // front.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
    // cameraFront = glm::normalize(front);
}

void scroll_callback(GLFWwindow* window, double xOffset, double yOffset) {
    // if (fov >= 1.0f && fov <= 45.0f)
    //     fov -= yOffset;
    // if (fov <= 1.0f)
    //     fov = 1.0f;
    // if (fov >= 45.0f)
    //     fov = 45.0f;
    // std::cout << "FOV: " << fov << std::endl;
    camera.process_mouse_scroll(yOffset);
}

void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
    glViewport(0, 0, width, height);
}

void process_input(GLFWwindow* window) {
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
        glfwSetWindowShouldClose(window, true);
    }
    if (glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS) {
        mix_nb -= 0.001;
        if (mix_nb <= 0.0f) {
            mix_nb = 0.0f;
        }
    }
    if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS) {
        mix_nb += 0.001f;
        if (mix_nb >= 1.0f) {
            mix_nb = 1.0f;
        }
    }
    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
        camera.process_keyboard(FORWARD, deltaTime);
    }
    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
        camera.process_keyboard(BACKWARD, deltaTime);
    }
    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
        camera.process_keyboard(LEFT, deltaTime);
    }
    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
        camera.process_keyboard(RIGHT, deltaTime);
    }
}

int main() {
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#if __APPLE__
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif

    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
    if (window == NULL) {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    glfwSetCursorPosCallback(window, mouse_callback);
    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);

    glfwSetScrollCallback(window, scroll_callback);
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        std::cout << "Failed to initialize GLAD" << std::endl;
        return -1;
    }

    stbi_set_flip_vertically_on_load(true);
    glEnable(GL_DEPTH_TEST);

    Shader ourShader("vshader.glsl", "fshader.glsl");
    Model  ourModel("./backpack.obj");
    while (!glfwWindowShouldClose(window)) {
        float currentFrame = glfwGetTime();
        deltaTime          = currentFrame - lastFrame;
        lastFrame          = currentFrame;
        process_input(window);
        glClearColor(0.05f, 0.05f, 0.05f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


        ourShader.use();

        // glm::mat4 model = glm::mat4(1.0f);
        // // model = glm::rotate(model, glm::radians(-55.0f), glm::vec3(1.0f, 0.0f, 0.0f));
        // model = glm::rotate(model, (float)glfwGetTime(), glm::vec3(0.5f, 1.0f, 0.0f));
        // glm::mat4 view = glm::mat4(1.0f);
        // view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));

        glm::mat4 projection = glm::mat4(1.0f);
        projection           = glm::perspective(glm::radians(camera.zoom_), // 视野角
        (float)WINDOW_WIDTH / (float)WINDOW_HEIGHT,
        0.1f,
        100.0f); // 近裁剪平面，远裁剪平面

        glm::mat4    view     = camera.get_view_matrix();
        unsigned int modelLoc = glGetUniformLocation(ourShader.ID, "model");
        unsigned int viewLoc  = glGetUniformLocation(ourShader.ID, "view");
        // glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));

        ourShader.setMat4("projection", projection);
        ourShader.setMat4("view", view);

        glm::mat4 model = glm::mat4(1.0f);
        model           = glm::translate(model, glm::vec3(0.0f, 0.0f, 0.05f));
        model           = glm::scale(model, glm::vec3(1.0f, 1.0f, -1.0f));
        ourShader.setMat4("model", model);
        ourModel.Draw(ourShader);

        // ourShader.setFloat("mix_nb", mix_nb);

        glfwSwapBuffers(window);
        glfwPollEvents();
    }
    glfwTerminate();
    return 0;
}