import argparse
import json
from pathlib import Path
from typing import List
from tqdm import tqdm
import library.train_util as train_util
import os

def main(args):
  assert not args.recursive or (args.recursive and args.full_path), "recursive requires full_path / recursiveはfull_pathと同時に指定してください"

  train_data_dir_path = Path(args.train_data_dir)
  image_paths: List[Path] = train_util.glob_images_pathlib(train_data_dir_path, args.recursive)
  print(f"found {len(image_paths)} images.")

  if args.in_json is None and Path(args.out_json).is_file():
    args.in_json = args.out_json

  if args.in_json is not None:
    print(f"loading existing metadata: {args.in_json}")
    metadata = json.loads(Path(args.in_json).read_text(encoding='utf-8'))
    print("tags data for existing images will be overwritten / 既存の画像のタグは上書きされます")
  else:
    print("new metadata will be created / 新しいメタデータファイルが作成されます")
    metadata = {}

  print("merge tags to metadata json.")
  for image_path in tqdm(image_paths):
    tags_path = image_path.with_suffix(args.caption_extension)
    tags = tags_path.read_text(encoding='utf-8').strip()

    if not os.path.exists(tags_path):
      tags_path = os.path.join(image_path, args.caption_extension)

    image_key = str(image_path) if args.full_path else image_path.stem
    if image_key not in metadata:
      metadata[image_key] = {}

    metadata[image_key]['tags'] = tags
    if args.debug:
      print(image_key, tags)

  # metadataを書き出して終わり
  print(f"writing metadata: {args.out_json}")
  Path(args.out_json).write_text(json.dumps(metadata, indent=2), encoding='utf-8')

  print("done!")


def setup_parser() -> argparse.ArgumentParser:
  parser = argparse.ArgumentParser()
  parser.add_argument("train_data_dir", type=str, help="directory for train images / 学習画像データのディレクトリ")
  parser.add_argument("out_json", type=str, help="metadata file to output / メタデータファイル書き出し先")
  parser.add_argument("--in_json", type=str,
                      help="metadata file to input (if omitted and out_json exists, existing out_json is read) / 読み込むメタデータファイル（省略時、out_jsonが存在すればそれを読み込む）")
  parser.add_argument("--full_path", action="store_true",
                      help="use full path as image-key in metadata (supports multiple directories) / メタデータで画像キーをフルパスにする（複数の学習画像ディレクトリに対応）")
  parser.add_argument("--recursive", action="store_true",
                      help="recursively look for training tags in all child folders of train_data_dir / train_data_dirのすべての子フォルダにある学習タグを再帰的に探す")
  parser.add_argument("--caption_extension", type=str, default=".txt",
                      help="extension of caption (tag) file / 読み込むキャプション（タグ）ファイルの拡張子")
  parser.add_argument("--debug", action="store_true", help="debug mode, print tags")

  return parser


if __name__ == '__main__':
  parser = setup_parser()

  args = parser.parse_args()
  main(args)