# -*- coding: utf-8 -*-
"""文档对话检索共享辅助函数。"""

from __future__ import annotations

from typing import Any, Dict, List


def to_int(value: Any, default: int) -> int:
    """安全整数转换。"""
    try:
        return int(value)
    except (TypeError, ValueError):
        return default


def to_float(value: Any, default: float = 0.0) -> float:
    """安全浮点数转换。"""
    try:
        return float(value)
    except (TypeError, ValueError):
        return default


def escape_milvus_string(value: str) -> str:
    """转义 Milvus 字符串中的特殊字符（反斜杠、单引号、双引号）。"""
    return str(value).replace("\\", "\\\\").replace("'", "\\'").replace('"', '\\"')


def combine_expr(*exprs: str) -> str:
    """用 AND 连接多个过滤表达式，每个子表达式加括号。"""
    parts = [f"({expr})" for expr in exprs if str(expr or "").strip()]
    return " and ".join(parts)


def pack_log_items(items: List[Dict[str, Any]], limit: int = 20, text_limit: int = 1500) -> List[Dict[str, Any]]:
    """打包候选条目为日志格式，限制条数和文本长度。"""
    packed = []
    for item in (items or [])[:limit]:
        if not isinstance(item, dict):
            continue
        metadata = item.get("metadata") if isinstance(item.get("metadata"), dict) else {}
        text = str(item.get("text") or item.get("text_content") or item.get("content") or "").strip()
        packed.append(
            {
                "candidate_key": item.get("candidate_key"),
                "source": item.get("source") or metadata.get("file_name") or "",
                "text": text[:text_limit],
                "vector_similarity": to_float(item.get("vector_similarity", item.get("similarity")), 0.0),
                "fusion_score": to_float(item.get("fusion_score"), 0.0),
                "rerank_score": to_float(item.get("rerank_score"), 0.0) if "rerank_score" in item else None,
                "source_hits": item.get("source_hits") if isinstance(item.get("source_hits"), dict) else {},
                "metadata": {
                    key: metadata.get(key)
                    for key in (
                        "document_id",
                        "parent_id",
                        "file_name",
                        "chapter_title",
                        "chapter_level_1",
                        "chapter_level_2",
                        "chapter_level_3",
                        "parent_count",
                        "child_hit_count",
                        "matched_child_texts",
                        "tag_match_terms",
                        "source_scope_valid",
                    )
                    if metadata.get(key) not in (None, "")
                },
            }
        )
    return packed