#include "glclasses.hpp"

#include <iostream>
#include <vector>

namespace endofthejedi {
    VAO::VAO() { glGenVertexArrays(1, &m_name); }

    VAO::~VAO() { glDeleteVertexArrays(1, &m_name); }

    void VAO::bind() { glBindVertexArray(m_name); }

    void VAO::fill(GLuint index, GLint size, GLenum type,
            GLboolean normalized, GLsizei stride,
            const GLvoid *pointer)
    {
        (void) type;

        glEnableVertexAttribArray(index);
        glVertexAttribPointer(index, size, GL_FLOAT, normalized, stride, pointer);
    }

    Shader::Shader() : m_program(0) { }

    Shader::~Shader() {}

    void Shader::init() { m_program = glCreateProgram(); }

    bool Shader::check() {
        GLint len = 0;
        GLint result = 0;

        glGetProgramiv(m_program, GL_LINK_STATUS, &result);
        glGetProgramiv(m_program, GL_INFO_LOG_LENGTH, &len);

        if (result == GL_FALSE) {
            std::cout<<"getting error log:" << std::endl;
            char *error = (char *)malloc(len+1);
            glGetProgramInfoLog(m_program, len, NULL, error);
            std::string str(error);
            std::cout << str << std::endl;
        }
        //std::cout << "checked program" << std::endl;

        return (bool)result;
    }

    bool Shader::checkShader(GLuint shader) {
        GLint len = 0;
        GLint result = 0;

        glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
        if (result == GL_FALSE) {
            glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &len);
            char *error = (char *)malloc(len+1);
            glGetShaderInfoLog(shader, len, NULL, error);
            std::string str(error, error + len);
            std::cout << str << std::endl;
        }

        //std::cout << "checked shader" << std::endl;

        return result != GL_FALSE;
    }

    void Shader::bind()
    {
        if (m_program == 0) {
            std::cerr << "error: invalid to bind invalid program (0)! "
                "use unbind() if that was your purpose!" << std::endl;

            exit(-1);
            return;
        }

        glUseProgram(m_program);
    }

    GLuint Shader::program() { return m_program; }

    void Shader::unbind() { glUseProgram(0); }

    void Shader::load(const std::string &path, GLenum shadertype) {
        if (m_program == 0) {
            std::cout<<"[shader] error: shader program is invalid (0)!" << std::endl;
            exit(-1);
            return;
        }

        GLuint shader = glCreateShader(shadertype);

        const char *shaderdata = path.c_str();
        glShaderSource(shader, 1, &shaderdata, NULL);
        glCompileShader(shader);
        checkShader(shader);

        glAttachShader(m_program, shader);
        glLinkProgram(m_program);
        check();

        glDeleteShader(shader);
    }

    GLuint Shader::location(const std::string &name) {
        return glGetUniformLocation(m_program, name.c_str());
    }
}