"""一覧系画面で再利用するExplorerフレームワーク（最小版）。"""

from dataclasses import dataclass
from datetime import datetime, timedelta
from typing import Optional, Tuple


EXPLORER_PERIODS = {
    "7d": "直近7日",
    "30d": "直近30日",
    "3m": "直近3ヶ月",
    "1y": "直近1年",
    "all": "全期間",
}


EXPLORER_SORTS = {
    "date": "日付",
    "invoice_number": "伝票番号",
    "customer_name": "顧客名",
    "document_type": "種別",
    "updated_at": "更新日時",
}


@dataclass
class ExplorerQueryState:
    """Explorerの検索状態。"""

    query: str = ""
    period_key: str = "3m"
    sort_key: str = "date"
    sort_desc: bool = True
    include_offsets: bool = False
    limit: int = 50
    offset: int = 0


def to_date_range(period_key: str, now: Optional[datetime] = None) -> Tuple[Optional[str], Optional[str]]:
    """期間キーからISO形式の日付範囲を返す。"""
    now = now or datetime.now()

    if period_key == "all":
        return None, None
    if period_key == "7d":
        start = now - timedelta(days=7)
    elif period_key == "30d":
        start = now - timedelta(days=30)
    elif period_key == "3m":
        start = now - timedelta(days=90)
    elif period_key == "1y":
        start = now - timedelta(days=365)
    else:
        start = now - timedelta(days=90)

    return start.replace(microsecond=0).isoformat(), now.replace(microsecond=0).isoformat()