//
// Created by trotfunky on 24/09/2019.
//

#include "Texture.h"


Texture::Texture() : width(0), height(0), color_bits(0), image_data(nullptr), opengl_id{(uint32_t)-1}
{}

Texture::~Texture()
{
    if (opengl_id[0] != (uint32_t)-1)
    {
        delete(image_data);
        glDeleteTextures(1,opengl_id);
    }
}

bool Texture::load_tga(const std::string& filename, uint8_t*& data_array)
{
    std::fstream file_stream(filename,std::ios_base::in|std::ios_base::binary);
    if (file_stream.fail())
    {
        std::cerr << "Error while opening " <<  filename << std::endl;
        return false;
    }

    // Length of the image ID
    uint8_t id_length = 0;
    file_stream >> id_length;

    file_stream.seekg(1,std::ios_base::cur);
    uint8_t tga_data_type = 0;
    file_stream >> tga_data_type;

    // Only supported type : Raw RGB data
    if (tga_data_type != 2)
    {
        std::cerr << "Error loading file " << filename << ": Unsupported format " << tga_data_type << std::endl;
        file_stream.close();
        return false;
    }

    // Place the cursor to the position of the width header data
    file_stream.seekg(12,std::ios_base::beg);
    file_stream.read((char*)&width,2);
    file_stream.read((char*)&height,2);
    file_stream >> color_bits;

    if (color_bits != 24)
    {
        std::cerr << "Error loading file " << filename << ": Unsupported " << color_bits << " bits colors" << std::endl;
        file_stream.close();
        return false;
    }

    // Move cursor to the end to get file size
    file_stream.seekg(0,std::ios_base::end);
    // Size of the file minus header length minus ID length
    int data_length = width*height*(color_bits/8);

    // Move cursor to the start of the data.
    file_stream.seekg(18+id_length,std::ios_base::beg);

    data_array = new uint8_t[data_length];
    file_stream.read((char*)data_array,data_length);

    return true;
}

bool Texture::load_rgb_tga(const std::string& rgb_filename)
{
    return load_tga(rgb_filename,image_data);
}

bool Texture::load_rgba_tga(const std::string& rgb_filename,const std::string& mask_filename)
{
    return false;
}