"""访谈/资料追问：回复条数与单条字数硬限制（不靠长 prompt）。"""

from __future__ import annotations


def truncate_chat_segments(
    segments: list[str],
    *,
    max_segments: int,
    max_chars_per_segment: int,
) -> list[str]:
    """保留前 max_segments 条，每条截断至 max_chars_per_segment（按字符数，中文友好）。"""
    if not segments:
        return []
    out: list[str] = []
    for raw in segments[:max_segments]:
        s = (raw or "").strip()
        if not s:
            continue
        if len(s) > max_chars_per_segment:
            # 保留 1 个字符给省略号，使总长度不超过上限
            s = s[: max_chars_per_segment - 1].rstrip() + "…"
        out.append(s)
    return out