import os
import re
import sys
import json
import html

MESSAGE_SPLIT_PATTERN = re.compile(r"\n--- (?=\d+ *\n)")
REPLY_ID_PATTERN = re.compile(r">>(\d+)")

def main():
    for folder in os.listdir():
        if not os.path.isdir(folder) or folder.startswith("."):
            continue
        board_result = []
        for file in os.listdir(folder):
            if not file.endswith(".txt"):
                continue
            file = os.path.join(folder, file)
            if not os.path.isfile(file):
                continue
            with open(file, "r", encoding="utf8") as f:
                content = f.read()[5:]
            content = MESSAGE_SPLIT_PATTERN.split(content)
            result = []
            orig_to_norm = {}
            i = 1
            for message in content:
                message = message.strip()
                if not message:
                    continue
                j = 0
                message_content = ""
                message_has_content = False
                for line in message.split("\n"):
                    line = line.strip()
                    if j == 0:
                        try:
                            message_id = int(line)
                        except Exception:
                            raise RuntimeError(f"Failed to parse message ID for \"{line}\" in \"{file}\"!")
                        orig_to_norm[message_id] = i
                    else:
                        replace_count = 0
                        def replace_id(match):
                            nonlocal replace_count
                            replace_count += 1
                            return f">>{orig_to_norm.get(int(match.group(1)), "unknown")}"
                        line = html.unescape(REPLY_ID_PATTERN.sub(replace_id, line))
                        if not message_has_content and replace_count == 0 and line.strip():
                            message_has_content = True
                        if j != 1:
                            message_content += "\n"
                        message_content += line
                    j += 1
                if j == 0:
                    raise RuntimeError(f"This message \"{message}\" in \"{file}\" doesn't start with a message ID!")
                if not message_has_content:
                    orig_to_norm.pop(message_id)
                    continue
                result.append({"id": i, "content": message_content})
                i += 1
            board_result.append(result)
        with open(f"{folder}.json", "w", encoding="utf8") as f:
            json.dump(board_result, f, ensure_ascii=False)

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print("\nScript interrupted by user, exiting...")
        sys.exit(1)