#include "EventHandler.h"

bool EventHandler::wireFrameMode = 0;

EventHandler::EventHandler(GLFWwindow *window)
    : window(window) {

    glfwSetKeyCallback(window, key_callback);

    // Currently disabled because callbacks are shitty
    //glfwSetCursorPosCallback(window, mouse_callback);

}

void EventHandler::handleEvents() {

    // Restore deltaCursorPos BEFORE polling events
    //deltaCursorPosX = 0.0f; deltaCursorPosY = 0.0f;

    glfwPollEvents();
    for(int i=0; i<CAMERA_ACTION_NUM_ITEMS; i++) {
        actionCameraRegister[i] = 0;
    }

    updateMouseDelta();

    if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);

    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
        actionCameraRegister[cameraForward] = 1;
    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
        actionCameraRegister[cameraBackward] = 1;
    if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
        actionCameraRegister[cameraUp] = 1;
    if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
        actionCameraRegister[cameraDown] = 1;
    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
        actionCameraRegister[cameraLeft] = 1;
    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
        actionCameraRegister[cameraRight] = 1;

}

void EventHandler::key_callback(GLFWwindow *window, int key, int scancode, int action, int mods) {
    // Silence warnings of unused variables.
    (void)window; (void)scancode; (void)mods;

    if (key == GLFW_KEY_O && action == GLFW_PRESS) {
        wireFrameMode = !wireFrameMode;
        if(wireFrameMode) {
            glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
        } else {
            glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
        }
    }
}

void EventHandler::updateMouseDelta() {
    double xPos, yPos;
    glfwGetCursorPos(window, &xPos, &yPos);

    if(firstMouseInput) {
        firstMouseInput = 0;
        lastCursorPosX = xPos;
        lastCursorPosY = yPos;
    }

    deltaCursorPosX = xPos - lastCursorPosX;
    deltaCursorPosY = -(yPos - lastCursorPosY);
    lastCursorPosX = xPos;
    lastCursorPosY = yPos;

    deltaCursorPosX *= mouseSensitivity;
    deltaCursorPosY *= mouseSensitivity;

}

/*void EventHandler::mouse_callback(GLFWwindow* window, double xpos, double ypos) {
    // Silence warnings of unused variables.
    (void)window;

    if(firstMouseInput) {
        firstMouseInput = 0;
        lastCursorPosX = xpos;
        lastCursorPosY = ypos;
    }

    deltaCursorPosX = xpos - lastCursorPosX;
    deltaCursorPosY = lastCursorPosY - ypos;
    lastCursorPosX = xpos;
    lastCursorPosY = ypos;

    deltaCursorPosX *= mouseSensitivity;
    deltaCursorPosY *= mouseSensitivity;
}*/