#include <iostream>
#define GLEW_STATIC
#include <GL/glew.h>
#include <GLFW/glfw3.h>
//#include <GL/GL.h>
//#include <GL/GLU.h>
#include <SOIL.h>

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

#include "Shader.h"


void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void do_movement();

const GLuint WIDTH = 800, HEIGHT = 600;

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);
GLfloat yaw = -90.0f;   // Yaw is initialized to -90.0 degrees since a yaw of 0.0 results in a direction vector pointing to the right (due to how Eular angles work) so we initially rotate a bit to the left.
GLfloat pitch = 0.0f;
GLfloat lastX = WIDTH / 2.0;
GLfloat lastY = HEIGHT / 2.0;
GLfloat fov = 45.0f;
bool keys[1024];

// Deltatime
GLfloat deltaTime = 0.0f;   // Time between current frame and last frame
GLfloat lastFrame = 0.0f;   // Time of last frame

int main()
{
    //Инициализация GLFW
    glfwInit();
    //Настройка GLFW
    //Задается минимальная требуемая версия OpenGL.
    //Мажорная
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    //Минорная
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 4);
    //Установка профайла для которого создается контекст
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    //Выключение возможности изменения размера окна
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "ProjectKovaleva", nullptr, nullptr);
    glfwMakeContextCurrent(window);

    glfwSetKeyCallback(window, key_callback);
    glfwSetCursorPosCallback(window, mouse_callback);
    glfwSetScrollCallback(window, scroll_callback);

    // GLFW Options
    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);

    glewExperimental = GL_TRUE;

    glewInit();


//  int width, height;
//  glfwGetFramebufferSize(window, &width, &height);
//  glViewport(0, 0, width, height);
    glViewport(0, 0, WIDTH, HEIGHT);
    glEnable(GL_DEPTH_TEST);

    Shader ourShader("C:\\Users\\Виктория\\Desktop\\проги\\MashGraph\\MashGraph\\textures.vs.txt", "C:\\Users\\Виктория\\Desktop\\проги\\MashGraph\\MashGraph\\textures.frag.txt");


    /*GLfloat vertices[] = {
        // Positions          // Texture Coords
         0.5f,  0.5f, 0.0f,   1.0f, 1.0f, // Top Right
         0.5f, -0.5f, 0.0f,   1.0f, 0.0f, // Bottom Right
        -0.5f, -0.5f, 0.0f,   0.0f, 0.0f, // Bottom Left
        -0.5f,  0.5f, 0.0f,   0.0f, 1.0f  // Top Left
    };
    GLuint indices[] = {  // Note that we start from 0!
        0, 1, 3, // First Triangle
        1, 2, 3  // Second Triangle
    };*/

    GLfloat vertices[] = {
        -0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
         0.5f, -0.5f, -0.5f,  1.0f, 0.0f,
         0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
         0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
        -0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
        -0.5f, -0.5f, -0.5f,  0.0f, 0.0f,

        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
         0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
         0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
         0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
        -0.5f,  0.5f,  0.5f,  0.0f, 1.0f,
        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,

        -0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
        -0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
        -0.5f,  0.5f,  0.5f,  1.0f, 0.0f,

         0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
         0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
         0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
         0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
         0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
         0.5f,  0.5f,  0.5f,  1.0f, 0.0f,

        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
         0.5f, -0.5f, -0.5f,  1.0f, 1.0f,
         0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
         0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
        -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
        -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,

        -0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
         0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
         0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
         0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
        -0.5f,  0.5f,  0.5f,  0.0f, 0.0f,
        -0.5f,  0.5f, -0.5f,  0.0f, 1.0f
    };
    // World space positions of our cubes
    glm::vec3 cubePositions[] = {
        glm::vec3(0.0f,  0.0f,  0.0f),
        glm::vec3(2.0f,  5.0f, -15.0f),
        glm::vec3(-1.5f, -2.2f, -2.5f),
        glm::vec3(-3.8f, -2.0f, -12.3f),
        glm::vec3(2.4f, -0.4f, -3.5f),
        glm::vec3(-1.7f,  3.0f, -7.5f),
        glm::vec3(1.3f, -2.0f, -2.5f),
        glm::vec3(1.5f,  2.0f, -2.5f),
        glm::vec3(1.5f,  0.2f, -1.5f),
        glm::vec3(-1.3f,  1.0f, -1.5f)
    };

    GLuint VBO, VAO/*, EBO*/;
    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);
//  glGenBuffers(1, &EBO);

    glBindVertexArray(VAO);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

//  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
//  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);


    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
    glEnableVertexAttribArray(0);

//  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
//  glEnableVertexAttribArray(1);

    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
    glEnableVertexAttribArray(2);

    glBindVertexArray(0);


    // Загрузим и создадим текстуру
    GLuint texture1;
    GLuint texture2;

    ////////////////// Texture1
    glGenTextures(1, &texture1);
    glBindTexture(GL_TEXTURE_2D, texture1);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    int width, height;
    unsigned char* image = SOIL_load_image("C:\\Users\\Виктория\\Desktop\\проги\\MashGraph\\MashGraph\\wood.jpg", &width, &height, 0, SOIL_LOAD_RGB);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
    glGenerateMipmap(GL_TEXTURE_2D);
    SOIL_free_image_data(image);
    glBindTexture(GL_TEXTURE_2D, 0);


    /////////////////////////// Texture2
    glGenTextures(1, &texture2);
    glBindTexture(GL_TEXTURE_2D, texture2);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);


    image = SOIL_load_image("C:\\Users\\Виктория\\Desktop\\проги\\MashGraph\\MashGraph\\200px-Awesome.svg.png", &width, &height, 0, SOIL_LOAD_RGB);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
    glGenerateMipmap(GL_TEXTURE_2D);
    SOIL_free_image_data(image);
    glBindTexture(GL_TEXTURE_2D, 0);


    while (!glfwWindowShouldClose(window))
    {
        // Calculate deltatime of current frame
        GLfloat currentFrame = glfwGetTime();
        deltaTime = currentFrame - lastFrame;
        lastFrame = currentFrame;

        glfwPollEvents();
        do_movement();

        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, texture1);
        glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture1"), 0);
        glActiveTexture(GL_TEXTURE1);
        glBindTexture(GL_TEXTURE_2D, texture2);
        glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture2"), 1);

        ourShader.Use();

    //  glm::mat4 transform;
    //  transform = glm::translate(transform, glm::vec3(0.5f, -0.5f, 0.0f));
    //  transform = glm::rotate(transform, (GLfloat)glfwGetTime() * 10.0f, glm::vec3(0.0f, 0.0f, 1.0f));


    //  GLuint transformLoc = glGetUniformLocation(ourShader.Program, "transform");
    //  glUniformMatrix4fv(transformLoc, 1, GL_FALSE, glm::value_ptr(transform));


        glm::mat4 view;
        view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);
        // Projection
        glm::mat4 projection;
        projection = glm::perspective(fov, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
        // Get the uniform locations
        GLint modelLoc = glGetUniformLocation(ourShader.Program, "model");
        GLint viewLoc = glGetUniformLocation(ourShader.Program, "view");
        GLint projLoc = glGetUniformLocation(ourShader.Program, "projection");
        // Pass the matrices to the shader
        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));

        glBindVertexArray(VAO);

        for (GLuint i = 0; i < 10; i++)
        {
            // Calculate the model matrix for each object and pass it to shader before drawing
            glm::mat4 model;
            model = glm::translate(model, cubePositions[i]);
            GLfloat angle = 20.0f * i;
            model = glm::rotate(model, angle, glm::vec3(1.0f, 0.3f, 0.5f));
            glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));

            glDrawArrays(GL_TRIANGLES, 0, 36);
        }

    //  glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
    //  glDrawArrays(GL_TRIANGLES, 0, 36);


        /////////////// Вторая трансформация
    //  transform = glm::mat4(1.0f);
    //  transform = glm::translate(transform, glm::vec3(-0.5f, 0.5f, 0.0f));
    //  GLfloat scaleAmount = sin(glfwGetTime());
    //  transform = glm::scale(transform, glm::vec3(scaleAmount, scaleAmount, scaleAmount));
    //  glUniformMatrix4fv(transformLoc, 1, GL_FALSE, glm::value_ptr(transform));

    //  glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);

        glBindVertexArray(0);

        glfwSwapBuffers(window);
    }

    glDeleteVertexArrays(1, &VAO);
    glDeleteBuffers(1, &VBO);
//  glDeleteBuffers(1, &EBO);

    glfwTerminate();
    return 0;
}


void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
        glfwSetWindowShouldClose(window, GL_TRUE);
    if (key >= 0 && key < 1024)
    {
        if (action == GLFW_PRESS)
            keys[key] = true;
        else if (action == GLFW_RELEASE)
            keys[key] = false;
    }
}

void do_movement()
{
    // Camera controls
    GLfloat cameraSpeed = 5.0f * deltaTime;
    if (keys[GLFW_KEY_W])
        cameraPos += cameraSpeed * cameraFront;
    if (keys[GLFW_KEY_S])
        cameraPos -= cameraSpeed * cameraFront;
    if (keys[GLFW_KEY_A])
        cameraPos -= glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
    if (keys[GLFW_KEY_D])
        cameraPos += glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
}

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

    GLfloat xoffset = xpos - lastX;
    GLfloat yoffset = lastY - ypos; // Reversed since y-coordinates go from bottom to left
    lastX = xpos;
    lastY = ypos;

    GLfloat sensitivity = 0.05; // Change this value to your liking
    xoffset *= sensitivity;
    yoffset *= sensitivity;

    yaw += xoffset;
    pitch += yoffset;

    // Make sure that when pitch is out of bounds, screen doesn't get flipped
    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;
}