#include "widget.hpp"
#include "gfx.hpp"

Widget::Widget(GLuint shaderProgram) :
    _shaderProgram(shaderProgram)
{
    const float lineLength = 0.1;
    for (int i = 0; i < 3*6; i++)
    {
        _vertices[i] *= _lineLength;
    }

    glGenVertexArrays(1, &_vao);
    glGenBuffers(1, &_vbo);

    glBindVertexArray(_vao);
    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
    size_t v3Size = 3 * sizeof(float);
    size_t lineSize = 2 * sizeof(float);
    size_t vboBufferSize = v3Size * lineSize * 3;
    glBufferData(GL_ARRAY_BUFFER, vboBufferSize, &_vertices[0], GL_STATIC_DRAW);

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);

    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindVertexArray(0);
}

void Widget::render(const float time)
{
    glUseProgram(_shaderProgram);
    updateModelViewProjectionMatrix(_shaderProgram, time);

    GLint modelLocation = getShaderUniformLocation(_shaderProgram, "_Model");
    glUniformMatrix4fv(modelLocation, 1, GL_FALSE, &_modelMatrix[0][0]);

    glBindVertexArray(_vao);
    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
    glDrawArrays(GL_LINES, 0, 6);
}

void Widget::setModelMatrix(const glm::mat4 matrix)
{
    _modelMatrix = matrix;
}

Widget::~Widget()
{
    glDeleteVertexArrays(1, &_vao);
    glDeleteBuffers(1, &_vbo);
}