import re

MAX_TEXT_LENGTH = 2000


def pdd_truncate_text(content: str, max_length: int = MAX_TEXT_LENGTH) -> str:
    if len(content) <= max_length:
        return content
    return content[: max_length - 3] + "..."


def pdd_split_long_text(content: str, max_length: int = MAX_TEXT_LENGTH) -> list[str]:
    chunks = []
    remaining = content
    while remaining:
        if len(remaining) <= max_length:
            chunks.append(remaining)
            break
        split_at = max_length
        for punct in ("\n", "。", "！", "？", "；", ".", "!", "?", ";"):
            pos = remaining[:max_length].rfind(punct)
            if pos > max_length // 2:
                split_at = pos + 1
                break
        chunks.append(remaining[:split_at])
        remaining = remaining[split_at:]
    return chunks


def pdd_strip_markdown(content: str) -> str:
    content = re.sub(r"\[([^\]]+)\]\([^)]+\)", r"\1", content)
    content = re.sub(r"\*\*([^*]+)\*\*", r"\1", content)
    content = re.sub(r"\*([^*]+)\*", r"\1", content)
    content = re.sub(r"`([^`]+)`", r"\1", content)
    content = re.sub(r"^#{1,6}\s+", "", content, flags=re.MULTILINE)
    content = re.sub(r"^\s*[-*+]\s+", "• ", content, flags=re.MULTILINE)
    content = re.sub(r"^\s*\d+\.\s+", "", content, flags=re.MULTILINE)
    content = re.sub(r"\n{3,}", "\n\n", content)
    return content.strip()


def pdd_format_order_card(order_sn: str) -> str:
    return f"📦 订单编号: {order_sn}\n点击查看详情"