#!/bin/bash

clear

# --- GET ARGS ---
while getopts "i:o:" opt; do
  case $opt in
    i)
      input="$OPTARG"
      ;;
    o)
      output="$OPTARG"
      ;;
    *)
      echo "[USAGE] $0 -i <input_path> -o <output_path>"
      exit 1
      ;;
  esac
done

# --- CHECK INPUT ---
if [[ -z "$input" ]]; then
  echo -e "\x1b[31m[ERROR]\x1b[0m input path is required."
  echo -e "\x1b[33m[USAGE]\x1b[0m $0 -i <input_path> -o <output_path>"
  exit 1
fi

# --- CHECK OUTPUT ---
if [[ -z "$output" ]]; then
  echo -e "\x1b[31m[ERROR]\x1b[0m output path is required."
  echo -e "\x1b[33m[USAGE]\x1b[0m $0 -i <input_path> -o <output_path>"
  exit 1
fi

# --- ENSURE OUTPUT PATH ---
mkdir -p "$output"

# --- COMPILE EACH FILE IN INPUT ---
for file in "$input"/*; do
  if [[ ! -f "$file" ]]; then
    continue
  fi

  filename=$(basename "$file")
  output_file="$output/$filename.spv"

  if [[ ! -f "$output_file" || "$file" -nt "$output_file" ]]; then
    echo -e "\x1b[32m[COMPILING]\x1b[0m $filename"
    glslc "$file" -o "$output_file"
  else
    echo -e "\x1b[90m[SKIPPING]\x1b[0m $filename"
  fi
done