/** CSci-4611 Assignment 2:  Car Soccer
 */

#include "car_soccer.h"
#include "config.h"


CarSoccer::CarSoccer() : GraphicsApp(1024,768, "Car Soccer") {
    // Define a search path for finding data files (images and shaders)
    searchPath_.push_back(".");
    searchPath_.push_back("./data");
    searchPath_.push_back(DATA_DIR_INSTALL);
    searchPath_.push_back(DATA_DIR_BUILD);
}

CarSoccer::~CarSoccer() {
}


Vector2 CarSoccer::joystick_direction() {
    Vector2 dir;
    if (IsKeyDown(GLFW_KEY_LEFT))
        dir[0]--;
    if (IsKeyDown(GLFW_KEY_RIGHT))
        dir[0]++;
    if (IsKeyDown(GLFW_KEY_UP))
        dir[1]++;
    if (IsKeyDown(GLFW_KEY_DOWN))
        dir[1]--;
    return dir;
}


void CarSoccer::OnSpecialKeyDown(int key, int scancode, int modifiers) {
    if (key == GLFW_KEY_SPACE) {
        // Here's where you could call some form of launch_ball();
    }
}


void CarSoccer::UpdateSimulation(double timeStep) {
    // Here's where you shound do your "simulation", updating the positions of the
    // car and ball as needed and checking for collisions.  Filling this routine
    // in is the main part of the assignment.
    
}


void CarSoccer::InitOpenGL() {
    // Set up the camera in a good position to see the entire field
    projMatrix_ = Matrix4::Perspective(60, aspect_ratio(), 1, 1000);
    modelMatrix_ = Matrix4::LookAt(Point3(0,60,70), Point3(0,0,10), Vector3(0,1,0));
 
    // Set a background color for the screen
    glClearColor(0.8f, 0.8f, 0.8f, 1.0f);
    
    // Load some image files we'll use
    fieldTex_.InitFromFile(Platform::FindFile("pitch.png", searchPath_));
    crowdTex_.InitFromFile(Platform::FindFile("crowd.png", searchPath_));
}


void CarSoccer::DrawUsingOpenGL() {
    // Draw the crowd as a fullscreen background image
    quickShapes_.DrawFullscreenTexture(Color(1,1,1), crowdTex_);
    
    // Draw the field with the field texture on it.
    Color col(16.0f/255.0f, 46.0f/255.0f, 9.0f/255.0f);
    Matrix4 M = Matrix4::Translation(Vector3(0.0f, -0.201f, 0.0f)) * Matrix4::Scale(Vector3(50.0f, 1.0f, 60.0f));
    quickShapes_.DrawSquare(modelMatrix_ * M, viewMatrix_, projMatrix_, col);
    M = Matrix4::Translation(Vector3(0.0f, -0.2f, 0.0f)) * Matrix4::Scale(Vector3(40.0f, 1.0f, 50.0f));
    quickShapes_.DrawSquare(modelMatrix_ * M, viewMatrix_, projMatrix_, Color(1,1,1), fieldTex_);
    
    // Draw the car
    Color carcol(0.8f, 0.2f, 0.2f);
    Matrix4 Mcar =
        Matrix4::Translation(car_.position() - Point3(0,0,0)) *
        Matrix4::Scale(car_.size()) *
        Matrix4::Scale(Vector3(0.5f, 0.5f, 0.5f));
    quickShapes_.DrawCube(modelMatrix_ * Mcar, viewMatrix_, projMatrix_, carcol);
    
    
    // Draw the ball
    Color ballcol(1,1,1);
    Matrix4 Mball =
        Matrix4::Translation(ball_.position() - Point3(0,0,0)) *
        Matrix4::Scale(Vector3(ball_.radius(), ball_.radius(), ball_.radius()));
    quickShapes_.DrawSphere(modelMatrix_ * Mball, viewMatrix_, projMatrix_, ballcol);
    
    
    // Draw the ball's shadow -- this is a bit of a hack, scaling Y by zero
    // flattens the sphere into a pancake, which we then draw just a bit
    // above the ground plane.
    Color shadowcol(0.2f, 0.4f, 0.15f);
    Matrix4 Mshadow =
        Matrix4::Translation(Vector3(ball_.position()[0], -0.1f, ball_.position()[2])) *
        Matrix4::Scale(Vector3(ball_.radius(), 0, ball_.radius())) *
        Matrix4::RotationX(90);
    quickShapes_.DrawSphere(modelMatrix_ * Mshadow, viewMatrix_, projMatrix_, shadowcol);
    
    
    // You should add drawing the goals and the boundary of the playing area
    // using quickShapes_.DrawLines()
}