// Copyright (c) 2023 Dominic Masters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#include "TextureTool.hpp"

using namespace Dawn;

std::vector<std::string> TextureTool::getRequiredFlags() {
  return std::vector<std::string>{ "input", "output" };
}

std::map<std::string, std::string> TextureTool::getOptionalFlags() {
  return {
    { "wrapX", "clamp" },
    { "wrapY", "clamp" },
    { "filterMin", "linear" },
    { "filterMax", "linear" }
  };
}

int32_t TextureTool::start() {
  // Finished with XML data, now we can write data out.
  File fileOut(flags["output"] + ".texture");
  if(fileOut.exists()) return 0;

  // Load input file
  File in(flags["input"]);
  if(!in.open(FILE_MODE_READ)) {
    std::cout << "Failed to open input file " << in.filename << std::endl;
    return 1;
  }

  int w, h, channels;
  auto imageRaw = stbi_load_from_file(in.file, &w, &h, &channels, STBI_rgb_alpha);
  if(imageRaw == NULL) {
    std::cout << "Failed to load input texture!" << std::endl;
    return 1;
  }
  in.close();

  // Convert to floating points
  size_t len = STBI_rgb_alpha * w * h;
  uint8_t *dataImage = (uint8_t*)malloc(sizeof(uint8_t) * len);
  for(size_t i = 0; i < len; i++) {
    auto dataIn = imageRaw[i];
    dataImage[i] = dataIn;
  }
  stbi_image_free(imageRaw);

  std::function<int32_t(std::string)> wrapFromString = [&](std::string wr) {
    if(wr == "repeat") return 0;
    if(wr == "mirror") return 1;
    if(wr == "clamp") return 2;
    if(wr == "border") return 3;
    return -1;
  };

  int32_t wrapX = wrapFromString(flags["wrapX"]);
  if(wrapX == -1) {
    std::cout << "Invalid wrapX value " << flags["wrapX"] << std::endl;
    return 1;
  }

  int32_t wrapY = wrapFromString(flags["wrapY"]);
  if(wrapY == -1) {
    std::cout << "Invalid wrapY value " << flags["wrapY"] << std::endl;
    return 1;
  }

  // Write info
  char headerBuffer[256];
  size_t headerBufferLength = sprintf((char *)headerBuffer, "DT_1.00|%i|%i|%i|%i|%i|%i|%i|",
    w,
    h,
    4,  // RGBA,
    wrapX,  // WRAPX
    wrapY,  // WRAPY
    flags["filterMin"] == "nearest" ? 0 : 1,
    flags["filterMag"] == "nearest" ? 0 : 1
  );

  // Open and create output
  File out(flags["output"] + ".texture");
  if(!out.mkdirp()) {
    std::cout << "Failed to make output dir " << out.filename << std::endl;
    return 1;
  }
  if(!out.open(FILE_MODE_WRITE)) {
    std::cout << "Failed to open texture file for writing " << out.filename << std::endl;
    return 1;
  }
  if(!out.writeRaw(headerBuffer, headerBufferLength)) {
    std::cout << "Failed to write texture header for " << out.filename << std::endl;
    return 1;
  }

  // Write texture
  if(!out.writeRaw((char *)dataImage, sizeof(uint8_t) * len)) {
    std::cout << "Failed to write texture data for " << out.filename << std::endl;
    return 1;
  }
  free(dataImage);

  return 0;
}