"""Conservative Taiwan stock subsector classification for hotspot analysis.

``twstock.codes.group`` remains the authoritative broad industry.  This module
adds a smaller, auditable layer only where a code override or a narrow company
name rule is reliable.  Unmatched stocks keep their original industry group.
"""

from __future__ import annotations

from typing import Any


TAXONOMY_SOURCE = "twstock.codes.group + conservative code/name rules"
TAXONOMY_LEVEL = "industry > subsector"


CODE_OVERRIDES: dict[str, str] = {
    # Semiconductor
    "2303": "晶圓代工",
    "2330": "晶圓代工",
    "5347": "晶圓代工",
    "6770": "晶圓代工",
    "2379": "IC 設計",
    "2454": "IC 設計",
    "3034": "IC 設計",
    "3443": "IC 設計",
    "3661": "IC 設計",
    "5274": "IC 設計",
    "6415": "IC 設計",
    "2329": "封裝測試",
    "2449": "封裝測試",
    "3711": "封裝測試",
    "6239": "封裝測試",
    "6257": "封裝測試",
    "8150": "封裝測試",
    "2408": "記憶體",
    "2344": "記憶體",
    "2337": "記憶體",
    "3260": "記憶體",
    "8299": "記憶體",
    # Computer and peripherals
    "2382": "AI 伺服器",
    "3231": "AI 伺服器",
    "6669": "AI 伺服器",
    "3706": "伺服器",
    "8210": "伺服器",
    "2324": "筆電與品牌電腦",
    "2353": "筆電與品牌電腦",
    "2356": "筆電與品牌電腦",
    "2357": "筆電與品牌電腦",
    "4938": "筆電與品牌電腦",
    # Electronic components
    "2313": "PCB",
    "2368": "PCB",
    "2383": "PCB",
    "3037": "PCB",
    "3044": "PCB",
    "4958": "PCB",
    "5439": "PCB",
    "6191": "PCB",
    "6274": "PCB",
    "8046": "PCB",
    "2327": "被動元件",
    "2492": "被動元件",
    "3026": "被動元件",
    "6173": "被動元件",
    "6449": "被動元件",
    "2059": "機構件與散熱",
    "3017": "機構件與散熱",
    "3653": "機構件與散熱",
    # Optoelectronics
    "2409": "面板",
    "3481": "面板",
    "6116": "面板",
    "3008": "光學鏡頭",
    "3406": "光學鏡頭",
    "8069": "電子紙",
    # Communications
    "2412": "電信營運",
    "3045": "電信營運",
    "4904": "電信營運",
    "2345": "網通設備",
    "3596": "網通設備",
    "5388": "網通設備",
    "6285": "網通設備",
    # Shipping and transportation
    "2603": "貨櫃航運",
    "2609": "貨櫃航運",
    "2615": "貨櫃航運",
    "2605": "散裝航運",
    "2606": "散裝航運",
    "2612": "散裝航運",
    "2637": "散裝航運",
    "5608": "散裝航運",
    "2610": "航空",
    "2618": "航空",
    "2646": "航空",
    "6757": "航空",
    # Finance
    "2855": "證券期貨",
    "5864": "證券期貨",
    "6005": "證券期貨",
    "6015": "證券期貨",
    "6016": "證券期貨",
    "6020": "證券期貨",
    "6021": "證券期貨",
    "6023": "證券期貨",
    "6024": "證券期貨",
    "6026": "證券期貨",
}


NAME_RULES_BY_GROUP: dict[str, tuple[tuple[str, tuple[str, ...]], ...]] = {
    "金融保險業": (
        ("證券期貨", ("證", "期")),
        ("保險", ("保", "產", "壽")),
        ("銀行", ("銀", "銀行", "商銀")),
    ),
    "航運業": (
        ("航空", ("航空", "航太", "華航", "亞航", "虎航")),
        ("物流運輸", ("宅配", "貨運", "高鐵", "大榮", "中菲行", "捷迅")),
        ("港埠倉儲", ("港", "櫃", "榮運")),
        ("造船", ("船", "漢翔", "龍德")),
    ),
    "光電業": (
        ("光學鏡頭", ("光學", "大立光", "玉晶光", "今國光", "佳能")),
        ("太陽能", ("太陽", "元晶", "茂迪", "聯合再生", "國碩", "安集")),
        ("LED", ("LED", "億光", "佰鴻", "宏齊", "光鋐", "富采")),
    ),
    "通信網路業": (
        ("電信營運", ("電信", "台灣大", "遠傳", "中華電")),
        ("網通設備", ("網通", "智邦", "中磊", "啟碁", "神準", "合勤", "正文", "明泰")),
        ("光通訊", ("光通", "聯亞", "上詮", "華星光", "光聖", "波若威")),
    ),
    "生技醫療業": (
        ("醫療器材", ("醫材", "醫療", "醫", "眼", "視陽", "晶碩", "精華")),
        ("藥品與新藥", ("藥", "生達", "美時", "保瑞", "神隆", "東洋")),
        ("生技研發", ("生技", "基因", "疫苗", "細胞")),
    ),
}


def classify_subsector(code: Any, name: Any, group: Any) -> dict[str, Any]:
    """Return a conservative fine-grained classification with audit metadata."""
    normalized_code = str(code or "").replace(".TW", "").replace(".TWO", "").strip()
    normalized_name = str(name or "").strip()
    normalized_group = str(group or "").strip() or "未分類"

    label = CODE_OVERRIDES.get(normalized_code)
    source = "code_override" if label else ""
    if not label:
        for candidate, keywords in NAME_RULES_BY_GROUP.get(normalized_group, ()):
            if any(keyword and keyword in normalized_name for keyword in keywords):
                label = candidate
                source = "name_keyword"
                break

    if not label:
        return {
            "subsector": normalized_group,
            "subsector_path": normalized_group,
            "subsector_source": "industry_fallback",
            "subsector_refined": False,
        }

    return {
        "subsector": label,
        "subsector_path": f"{normalized_group} > {label}",
        "subsector_source": source,
        "subsector_refined": True,
    }