#include "renderer/shader.h"

Shader::Shader()
{
}

Shader::~Shader()
{
}

void Shader::init(const std::string &vertexCode, const std::string &fragmentCode)
{
    m_vertexCode = vertexCode;
    m_fragmentCode = fragmentCode;
    compile();
    link();
}

void Shader::use()
{
    glUseProgram(m_id);
}

void Shader::setBool(const std::string &name, bool value) const
{
    glUniform1i(glGetUniformLocation(m_id, name.c_str()), (int)value);
}

void Shader::setInt(const std::string &name, int value) const
{
    glUniform1i(glGetUniformLocation(m_id, name.c_str()), value);
}

void Shader::setFloat(const std::string &name, float value) const
{
    glUniform1f(glGetUniformLocation(m_id, name.c_str()), value);
}

void Shader::setVec2(const std::string &name, const glm::vec2 &value) const
{
    glUniform2fv(glGetUniformLocation(m_id, name.c_str()), 1, &value[0]);
}
void Shader::setVec2(const std::string &name, float x, float y) const
{
    glUniform2f(glGetUniformLocation(m_id, name.c_str()), x, y);
}

void Shader::setVec3(const std::string &name, const glm::vec3 &value) const
{
    glUniform3fv(glGetUniformLocation(m_id, name.c_str()), 1, &value[0]);
}
void Shader::setVec3(const std::string &name, float x, float y, float z) const
{
    glUniform3f(glGetUniformLocation(m_id, name.c_str()), x, y, z);
}

void Shader::setVec4(const std::string &name, const glm::vec4 &value) const
{
    glUniform4fv(glGetUniformLocation(m_id, name.c_str()), 1, &value[0]);
}
void Shader::setVec4(const std::string &name, float x, float y, float z, float w) const
{
    glUniform4f(glGetUniformLocation(m_id, name.c_str()), x, y, z, w);
}

void Shader::setMat2(const std::string &name, const glm::mat2 &mat) const
{
    glUniformMatrix2fv(glGetUniformLocation(m_id, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}

void Shader::setMat3(const std::string &name, const glm::mat3 &mat) const
{
    glUniformMatrix3fv(glGetUniformLocation(m_id, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}

void Shader::setMat4(const std::string &name, const glm::mat4 &mat) const
{
    glUniformMatrix4fv(glGetUniformLocation(m_id, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}

void Shader::compile()
{
    const char *vsCode = m_vertexCode.c_str();
    m_vertexId = glCreateShader(GL_VERTEX_SHADER);
    glShaderSource(m_vertexId, 1, &vsCode, NULL);
    glCompileShader(m_vertexId);
    checkCompileError(m_vertexId, "Vertex Shader");

    const char *fsCode = m_fragmentCode.c_str();
    m_fragmentId = glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(m_fragmentId, 1, &fsCode, NULL);
    glCompileShader(m_fragmentId);
    checkCompileError(m_fragmentId, "Fragment Shader");
}

void Shader::link()
{
    m_id = glCreateProgram();
    glAttachShader(m_id, m_vertexId);
    glAttachShader(m_id, m_fragmentId);
    glLinkProgram(m_id);
    checkLinkingError();
    glDeleteShader(m_vertexId);
    glDeleteShader(m_fragmentId);
}

void Shader::checkCompileError(unsigned int shader, const std::string type)
{
    int success;
    char infoLog[1024];
    glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
    if (!success)
    {
        glGetShaderInfoLog(shader, 1024, NULL, infoLog);
        std::cout << "Shader: Error compiling " << type << ":" << std::endl
                  << infoLog
                  << std::endl;
    }
}

void Shader::checkLinkingError()
{
    int success;
    char infoLog[1024];
    glGetProgramiv(m_id, GL_LINK_STATUS, &success);
    if (!success)
    {
        glGetProgramInfoLog(m_id, 1024, NULL, infoLog);
        std::cout << "Shader: Error linking shader program: " << std::endl
                  << infoLog
                  << std::endl;
    }
}