#include "BumpMapDemo.h"
#include "Input.h"
#include <glm/common.hpp>

BumpMapDemo::BumpMapDemo()
    : number_of_steps(10.0), number_of_refinement_steps(10.0), bump_depth(0.1),
      render_shader(Shader("Shader/bump.vs", "Shader/bump.fs")),
      camera(Camera(90, 1920, 1080, 0.1, 1000.0)),
      albedo("Resources/Textures/PavingStones/PavingStones070_2K_Color.jpg", Texture::Settings()),
      bump("Resources/Textures/PavingStones/PavingStones070_2K_Displacement.jpg",
           Texture::Settings()),
      normal("Resources/Textures/PavingStones/PavingStones070_2K_Normal.jpg", Texture::Settings()) {
    // Move and rotate the camera so we see the quad well
    camera.translate(glm::vec3(0.0, -1.0, 1.0));
    camera.rotate(30, glm::vec3(1.0, 0.0, 0.0));
}

void BumpMapDemo::render(float delta) {
    glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    render_shader.use();

    // Camera
    render_shader.setMat4("projection", camera.get_projection());
    render_shader.setMat4("view", camera.get_view());
    render_shader.setVec3("viewPos", camera.get_translation());

    // Lighting
    render_shader.setVec3("lightPos", glm::vec3(0.0, 1.0, 5.0));

    // Settings for bump mapping
    if (Input::is_key_down(GLFW_KEY_Q)) {
        number_of_steps += delta * 5.0;
    }
    if (Input::is_key_down(GLFW_KEY_W)) {
        number_of_steps -= delta * 5.0;
    }
    if (Input::is_key_down(GLFW_KEY_A)) {
        number_of_refinement_steps += delta * 5.0;
    }
    if (Input::is_key_down(GLFW_KEY_S)) {
        number_of_refinement_steps -= delta * 5.0;
    }
    if (Input::is_key_down(GLFW_KEY_Z)) {
        bump_depth += delta * 0.1;
    }
    if (Input::is_key_down(GLFW_KEY_X)) {
        bump_depth -= delta * 0.1;
    }

    render_shader.setFloat("number_of_steps", glm::max(0.0f, number_of_steps));
    render_shader.setFloat("number_of_refinement_steps",
                           glm::max(0.0f, number_of_refinement_steps));
    render_shader.setFloat("bump_depth", glm::max(0.0f, bump_depth));

    // Textures
    albedo.bind_to(0);
    normal.bind_to(1);
    bump.bind_to(2);

    // Quad which is rendered onto
    quad_mesh.rotate(delta * 25.0f, glm::normalize(glm::vec3(0.0, 0.0, 1.0)));
    quad_mesh.render(render_shader);
}