#define GLEW_STATIC
#include <glew.h>
// GLFW
#include <glfw3.h>
#include <iostream>
#include "Shader.h"
#include "Camera.h"
#include <SOIL.h>

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

bool keys[1024];

const GLuint WIDTH = 800, HEIGHT = 600;

Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
GLfloat lastX = WIDTH / 2;
GLfloat lastY = HEIGHT / 2;

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

glm::vec3 lightPos(1.2f, 1.0f, 2.0f);

void Do_Movement()
{
    // Camera controls
    if (keys[GLFW_KEY_W])
        camera.ProcessKeyboard(FORWARD, deltaTime);
    if (keys[GLFW_KEY_S])
        camera.ProcessKeyboard(BACKWARD, deltaTime);
    if (keys[GLFW_KEY_A])
        camera.ProcessKeyboard(LEFT, deltaTime);
    if (keys[GLFW_KEY_D])
        camera.ProcessKeyboard(RIGHT, deltaTime);
}

// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
    //cout << key << endl;
    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;
    }
}

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;

    camera.ProcessMouseMovement(xoffset, yoffset);
}


void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
    camera.ProcessMouseScroll(yoffset);
}

GLuint InitVBO(GLfloat vertices[])
{
    GLuint VBO;
    glGenBuffers(1, &VBO);
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

    return VBO;
}

int main()
{
    glfwInit();

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", nullptr, nullptr);
    if (window == nullptr)
    {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    glfwSetKeyCallback(window, key_callback);
    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
    glfwSetCursorPosCallback(window, mouse_callback);
    glfwSetScrollCallback(window, scroll_callback);

    glewExperimental = GL_TRUE;
    if (glewInit() != GLEW_OK)
    {
        std::cout << "Failed to initialize GLEW" << std::endl;
        return -1;
    }

    glViewport(0, 0, WIDTH, HEIGHT);

    Shader ourShader("vertexShader.txt", "fragmentShader.txt");
    Shader lampShader("lampVertexShader.txt", "lampFragmentShader.txt");

    float vertices[] = {
        -0.5f, -0.5f, -0.5f,
         0.5f, -0.5f, -0.5f,
         0.5f,  0.5f, -0.5f,
         0.5f,  0.5f, -0.5f,
        -0.5f,  0.5f, -0.5f,
        -0.5f, -0.5f, -0.5f,

        -0.5f, -0.5f,  0.5f,
         0.5f, -0.5f,  0.5f,
         0.5f,  0.5f,  0.5f,
         0.5f,  0.5f,  0.5f,
        -0.5f,  0.5f,  0.5f,
        -0.5f, -0.5f,  0.5f,

        -0.5f,  0.5f,  0.5f,
        -0.5f,  0.5f, -0.5f,
        -0.5f, -0.5f, -0.5f,
        -0.5f, -0.5f, -0.5f,
        -0.5f, -0.5f,  0.5f,
        -0.5f,  0.5f,  0.5f,

         0.5f,  0.5f,  0.5f,
         0.5f,  0.5f, -0.5f,
         0.5f, -0.5f, -0.5f,
         0.5f, -0.5f, -0.5f,
         0.5f, -0.5f,  0.5f,
         0.5f,  0.5f,  0.5f,

        -0.5f, -0.5f, -0.5f,
         0.5f, -0.5f, -0.5f,
         0.5f, -0.5f,  0.5f,
         0.5f, -0.5f,  0.5f,
        -0.5f, -0.5f,  0.5f,
        -0.5f, -0.5f, -0.5f,

        -0.5f,  0.5f, -0.5f,
         0.5f,  0.5f, -0.5f,
         0.5f,  0.5f,  0.5f,
         0.5f,  0.5f,  0.5f,
        -0.5f,  0.5f,  0.5f,
        -0.5f,  0.5f, -0.5f

    };

    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 indices[] = {  // Note that we start from 0!
        0, 1, 3, // First Triangle
        1, 2, 3  // Second Triangle
    };

    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);

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

    glBindVertexArray(0); // Unbind VAO

    GLuint lightVAO;
    glGenVertexArrays(1, &lightVAO);
    glBindVertexArray(lightVAO);
    // Так как VBO объекта-контейнера уже содержит все необходимые данные, то нам нужно только связать с ним новый VAO
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    // Настраиваем атрибуты (нашей лампе понадобятся только координаты вершин)
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0);
    glEnableVertexAttribArray(0);
    glBindVertexArray(0);

    // Container
    int width, height;
    unsigned char* image = SOIL_load_image("container.jpg", &width, &height, 0, SOIL_LOAD_RGB);

    glEnable(GL_DEPTH_TEST);


    while (!glfwWindowShouldClose(window))
    {
        glfwPollEvents();
        Do_Movement();

        GLfloat currentFrame = glfwGetTime();
        deltaTime = currentFrame - lastFrame;
        lastFrame = currentFrame;

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        // Activate shader
        ourShader.Use();

        GLint objectColorLoc = glGetUniformLocation(ourShader.Program, "objectColor");
        GLint lightColorLoc = glGetUniformLocation(ourShader.Program, "lightColor");
        glUniform3f(objectColorLoc, 1.0f, 0.5f, 0.31f);
        glUniform3f(lightColorLoc, 1.0f, 1.0f, 1.0f);

        glm::mat4 view;
        view = camera.GetViewMatrix();

        glm::mat4 projection;
        projection = glm::perspective(camera.Zoom, (float) HEIGHT / (float) WIDTH, 0.1f, 1000.0f);

        GLint modelLoc = glGetUniformLocation(ourShader.Program, "model");

        GLint viewLoc = glGetUniformLocation(ourShader.Program, "view");
        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));

        GLint projectionLoc = glGetUniformLocation(ourShader.Program, "projection");
        glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, glm::value_ptr(projection));


        // Draw container
        glBindVertexArray(VAO);
        for (GLuint i = 0; i < 10; i++)
        {
            glm::mat4 model = { { 1, 0, 0, 0 }, { 0, 1, 0, 0 }, { 0, 0, 1, 0 }, { 0, 0, 0, 1 } };
            model = glm::translate(model, cubePositions[i]);
            model = glm::rotate(model, glm::radians((GLfloat)glfwGetTime() * 50.0f),
                glm::vec3(0.5f, 1.0f, 0.5f + sin(glm::radians((GLfloat)glfwGetTime() * 50.0f + i * 20.0f)) / 2));
            glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));

            glDrawArrays(GL_TRIANGLES, 0, 36);
        }
        glBindVertexArray(0);
        glBindVertexArray(0);

        lampShader.Use();
        // Get location objects for the matrices on the lamp shader (these could be different on a different shader)
        modelLoc = glGetUniformLocation(lampShader.Program, "model");
        viewLoc = glGetUniformLocation(lampShader.Program, "view");
        projectionLoc = glGetUniformLocation(lampShader.Program, "projection");
        // Set matrices
        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
        glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, glm::value_ptr(projection));

        glm::mat4 model = glm::mat4();
        model = glm::translate(model, lightPos);
        model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
        // Draw the light object (using light's vertex attributes)
        glBindVertexArray(lightVAO);
        glDrawArrays(GL_TRIANGLES, 0, 36);
        glBindVertexArray(0);



        glfwSwapBuffers(window);
    }

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

    glfwTerminate();

    return 0;
}
/*
    GLuint texture1, texture2;

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

    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);

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

    // Awesomeface
    image = SOIL_load_image("pidor.jpg", &width, &height, 0, SOIL_LOAD_RGB);

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

    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);

    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_MIPMAP_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    */