#!/bin/zsh
setopt null_glob

# 从环境变量或参数获取配置
INPUT_FILE="${INPUT_FILE:-$1}"
OUTPUT_FILE="${OUTPUT_FILE:-$2}"
MODELPATH="${MODELPATH:-./models}"
MODELNAME="${MODELNAME:-ultramix-balanced-4x}"
BIN_PATH="${BIN_PATH:-./bin/mac/upscayl-bin}"
TARGET_WIDTH=4320
TARGET_HEIGHT=7680
FORMAT="jpg"
THREADS="4:8:4"
TARGET_SIZE=$((10 * 1024 * 1024)) # 10MB
MAX_SIZE=$((20 * 1024 * 1024))   # 20MB

# 检查输入参数
if [ -z "$INPUT_FILE" ] || [ -z "$OUTPUT_FILE" ]; then
  echo "错误: 需要指定输入和输出文件路径"
  echo "用法: $0 <输入文件> <输出文件>"
  echo "或者设置环境变量 INPUT_FILE 和 OUTPUT_FILE"
  exit 1
fi

if [ ! -f "$INPUT_FILE" ]; then
  echo "错误: 输入文件不存在: $INPUT_FILE"
  exit 1
fi

echo "===== 开始处理单张图片 ====="
echo "输入文件: $INPUT_FILE"
echo "输出文件: $OUTPUT_FILE"
echo "模型路径: $MODELPATH"
echo "模型名称: $MODELNAME"
echo "二进制文件: $BIN_PATH"

# 确保输出目录存在
output_dir=$(dirname "$OUTPUT_FILE")
mkdir -p "$output_dir"

base=$(basename "$INPUT_FILE")
compress=10  # 0为无压缩，100为最大压缩
try=1

echo "\n==== 开始处理: $base ===="
echo "输入文件: $INPUT_FILE"
echo "输出文件: $OUTPUT_FILE"
echo "模型: $MODELNAME, 模型路径: $MODELPATH"
echo "格式: $FORMAT"

# 获取原图宽高
read orig_w orig_h <<< $(sips -g pixelWidth -g pixelHeight "$INPUT_FILE" 2>/dev/null | awk '/pixelWidth/ {w=$2} /pixelHeight/ {h=$2} END{print w,h}')
if [ "$orig_w" -lt "$orig_h" ]; then
  short=$orig_w
  long=$orig_h
else
  short=$orig_h
  long=$orig_w
fi
echo "DEBUG: orig_w=$orig_w, orig_h=$orig_h, short=$short, long=$long"

scale1=$(echo "scale=8; 4320/$short" | bc)
scale2=$(echo "scale=8; 7680/$long" | bc)
echo "DEBUG: scale1=$scale1, scale2=$scale2"

# 取scale1和scale2的最大值
scale=$(echo "$scale1 > $scale2" | bc -l)
if [ "$scale" -eq 1 ]; then
  use_scale=$scale1
else
  use_scale=$scale2
fi
use_scale=$(printf "%f" "$use_scale")
echo "DEBUG: use_scale=$use_scale"

# 保证不缩小
scale_cmp=$(echo "$use_scale > 1" | bc -l)
echo "DEBUG: scale_cmp=$scale_cmp"
if [ "$scale_cmp" -eq 1 ]; then
  target_w=$(awk -v w="$orig_w" -v s="$use_scale" 'BEGIN{printf "%d", w*s+0.5}')
  target_h=$(awk -v h="$orig_h" -v s="$use_scale" 'BEGIN{printf "%d", h*s+0.5}')
  echo "原图分辨率: ${orig_w}x${orig_h}, 目标分辨率: ${target_w}x${target_h} (短边≥4320, 长边≥7680)"
else
  target_w=$orig_w
  target_h=$orig_h
  echo "原图分辨率: ${orig_w}x${orig_h}, 已满足短边≥4320且长边≥7680，无需放大"
fi

# 处理图片，循环调整压缩率直到满足大小要求
while true; do
  echo "尝试第 $try 次: compress=$compress"
  upscale_cmd="\"$BIN_PATH\" -i \"$INPUT_FILE\" -o \"$OUTPUT_FILE\" -f $FORMAT -m \"$MODELPATH\" -n $MODELNAME -r \"${target_w}x${target_h}\" -c $compress -j $THREADS -v"
  echo "执行命令: $upscale_cmd"
  eval $upscale_cmd
  
  if [ ! -f "$OUTPUT_FILE" ]; then
    echo "$base: 未生成图片，compress=$compress"
    echo "处理失败"
    exit 1
  fi
  
  size=$(stat -f%z "$OUTPUT_FILE")
  res=$(sips -g pixelWidth -g pixelHeight "$OUTPUT_FILE" 2>/dev/null | awk '/pixelWidth|pixelHeight/ {print $2}' | xargs | sed 's/ /x/')
  echo "$base: compress=$compress, size=${size} bytes, 分辨率=${res}"
  
  if [ $size -le $MAX_SIZE ] || [ $compress -ge 100 ]; then
    echo "$base: 满足大小要求，最终 compress=$compress"
    break
  fi
  
  # compress 每次递增10，最大不超过100
  compress=$((compress + 10))
  [ $compress -gt 100 ] && compress=100
  try=$((try+1))
  [ $try -gt 10 ] && echo "$base: 达到最大尝试次数，停止调整" && break
done

echo "\n===== 处理完成 ====="
if [ -f "$OUTPUT_FILE" ]; then
  input_size=$(stat -f%z "$INPUT_FILE")
  output_size=$(stat -f%z "$OUTPUT_FILE")
  input_res=$(sips -g pixelWidth -g pixelHeight "$INPUT_FILE" 2>/dev/null | awk '/pixelWidth|pixelHeight/ {print $2}' | xargs | sed 's/ /x/')
  output_res=$(sips -g pixelWidth -g pixelHeight "$OUTPUT_FILE" 2>/dev/null | awk '/pixelWidth|pixelHeight/ {print $2}' | xargs | sed 's/ /x/')
  
  echo "输入: $(basename "$INPUT_FILE") - ${input_size} bytes, ${input_res}"
  echo "输出: $(basename "$OUTPUT_FILE") - ${output_size} bytes, ${output_res}"
  echo "处理成功完成！"
else
  echo "处理失败：未生成输出文件"
  exit 1
fi