import os
from args import args
from PIL import Image
import struct

def extractPaletteFromImage(image):
  # goes through and finds all unique colors in the image
  if image.mode != 'RGBA':
    image = image.convert('RGBA')
  pixels = list(image.getdata())
  uniqueColors = []
  for color in pixels:
    if color not in uniqueColors:
      uniqueColors.append(color)
  return uniqueColors

def savePalette(pixels, outputFilePath):
  colorCount = len(pixels)
  buf = bytearray(b"DPF")
  buf += struct.pack("<i", colorCount)           # little-endian int32_t
  for r, g, b, a in pixels:                      # each channel 0..255
    buf += struct.pack("BBBB", r, g, b, a)     # raw bytes
  os.makedirs(os.path.dirname(outputFilePath), exist_ok=True)
  with open(outputFilePath, "wb") as f:
    f.write(buf)

def processPalette(assetPath):
  # Process the image file
  print(f"Processing palette: {assetPath}")

  # Load the image
  image = Image.open(assetPath)
  pixels = extractPaletteFromImage(image)

  # Save the processed image to the output directory
  fileNameWithoutExt = os.path.splitext(os.path.basename(assetPath))[0]
  outputFilePath = os.path.join(args.output_assets, f"{fileNameWithoutExt}.dpf")
  os.makedirs(os.path.dirname(outputFilePath), exist_ok=True)
  savePalette(pixels, outputFilePath)

  outputRelative = os.path.relpath(outputFilePath, args.output_assets)

  return {
    "outputFile": outputRelative,
    "paletteColors": len(pixels),
    "files": [ outputFilePath ]
  }

def processImage(assetPath):
  print(f"Processing image: {assetPath}")
  
  # Load the image
  image = Image.open(assetPath)
  pixels = extractPaletteFromImage(image)

  return {
    # "outputFile": os.path.relpath(assetPath, args.input_assets),
    # "paletteColors": len(pixels),
    "files": [ assetPath ]
  }