"""키움증권 REST API 스펙 조회 전용 MCP.

KIS Code Assistant MCP 와 같이 문서를 정확히 찾아주는 용도.
실제 REST 호출·주문·토큰 발급은 절대 하지 않는다.
"""

from __future__ import annotations

import json
import os
import re
import sys
from functools import lru_cache
from typing import Any, Optional

from fastmcp import FastMCP

VERSION = "0.1.0"
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
DEFAULT_SPEC = os.path.join(SCRIPT_DIR, "data", "kiwoom-rest-api-spec.json")

# URL path → 사람이 읽기 쉬운 카테고리
URL_CATEGORY = {
    "/oauth2/token": "인증",
    "/oauth2/revoke": "인증",
    "/api/dostk/acnt": "국내_계좌",
    "/api/dostk/ordr": "국내_주문",
    "/api/dostk/crdordr": "국내_신용주문",
    "/api/dostk/chart": "국내_차트",
    "/api/dostk/stkinfo": "국내_종목정보",
    "/api/dostk/mrkcond": "국내_시장조건",
    "/api/dostk/rkinfo": "국내_순위",
    "/api/dostk/sect": "국내_업종",
    "/api/dostk/thme": "국내_테마",
    "/api/dostk/elw": "국내_ELW",
    "/api/dostk/etf": "국내_ETF",
    "/api/dostk/frgnistt": "국내_외국인",
    "/api/dostk/slb": "국내_대차",
    "/api/dostk/watchlist": "국내_관심종목",
    "/api/dostk/websocket": "국내_웹소켓",
    "/api/us/acnt": "해외_계좌",
    "/api/us/ordr": "해외_주문",
    "/api/us/chart": "해외_차트",
    "/api/us/stkinfo": "해외_종목정보",
    "/api/us/mrkcond": "해외_시장조건",
    "/api/us/rkinfo": "해외_순위",
    "/api/us/sect": "해외_업종",
    "/api/us/watchlist": "해외_관심종목",
    "/api/us/exchange": "해외_환율",
    "/api/us/websocket": "해외_웹소켓",
}

PREFIX_CATEGORY = {
    "au": "인증",
    "ka": "국내주식",
    "kt": "국내계좌/주문",
    "us": "해외주식",
    "0": "국내_실시간(웹소켓 FID)",
}


def _strip_html(text: str) -> str:
    if not text:
        return ""
    t = re.sub(r"<br\s*/?>", "\n", str(text), flags=re.I)
    t = re.sub(r"<[^>]+>", "", t)
    return t.strip()


def _normalize_fields(items: Any) -> list[dict[str, Any]]:
    if not isinstance(items, list):
        return []
    out: list[dict[str, Any]] = []
    for it in items:
        if not isinstance(it, dict):
            continue
        out.append(
            {
                "itemId": it.get("itemId") or "",
                "itemNm": it.get("itemNm") or "",
                "type": it.get("type") or "",
                "length": it.get("length") or "",
                "desc": _strip_html(it.get("desc") or ""),
            }
        )
    return out


def _parse_example(ex: Any) -> Any:
    if ex is None:
        return None
    if isinstance(ex, (dict, list)):
        return ex
    if isinstance(ex, str):
        s = ex.strip()
        if not s:
            return None
        try:
            return json.loads(s)
        except Exception:
            return s
    return ex


def _category_for(api: dict[str, Any]) -> str:
    url = (api.get("url") or "").strip()
    if url in URL_CATEGORY:
        return URL_CATEGORY[url]
    api_id = str(api.get("apiId") or "")
    for pref, name in PREFIX_CATEGORY.items():
        if api_id.startswith(pref):
            return name
    return "기타"


class KiwoomSpecIndex:
    """키움 TR 카탈로그 인덱스 (읽기 전용)."""

    MAX_SEARCH = 20

    def __init__(self, path: str) -> None:
        self.path = path
        # 원본 apiId 키 유지 (0g / 0G 등 대소문자 구분)
        self.apis: dict[str, dict[str, Any]] = {}
        # 소문자 → 원본 apiId 목록 (조회 편의)
        self._by_lower: dict[str, list[str]] = {}
        self.error_codes: list[dict[str, Any]] = []
        self._load(path)

    def _load(self, path: str) -> None:
        with open(path, "r", encoding="utf-8") as f:
            raw = json.load(f)
        if not isinstance(raw, dict):
            raise ValueError("spec root must be object")
        for key, val in raw.items():
            if key == "errorCodeList" and isinstance(val, list):
                self.error_codes = [x for x in val if isinstance(x, dict)]
                continue
            if not isinstance(val, dict):
                continue
            api_id = str(val.get("apiId") or key).strip()
            if not api_id:
                continue
            # 동일 키 충돌 시 스펙 키로 구분 보존
            store_id = api_id
            if store_id in self.apis and self.apis[store_id] is not val:
                store_id = str(key).strip() or api_id
            self.apis[store_id] = val
            self._by_lower.setdefault(api_id.lower(), [])
            if store_id not in self._by_lower[api_id.lower()]:
                self._by_lower[api_id.lower()].append(store_id)

    def stats(self) -> dict[str, Any]:
        by_cat: dict[str, int] = {}
        by_prefix: dict[str, int] = {}
        for api in self.apis.values():
            cat = _category_for(api)
            by_cat[cat] = by_cat.get(cat, 0) + 1
            aid = str(api.get("apiId") or "")
            pref = aid[:2] if len(aid) >= 2 else aid
            by_prefix[pref] = by_prefix.get(pref, 0) + 1
        return {
            "api_count": len(self.apis),
            "error_code_count": len(self.error_codes),
            "by_category": dict(sorted(by_cat.items(), key=lambda x: (-x[1], x[0]))),
            "by_prefix": dict(sorted(by_prefix.items(), key=lambda x: (-x[1], x[0]))),
            "spec_path": self.path,
        }

    def _summary(self, api: dict[str, Any]) -> dict[str, Any]:
        return {
            "apiId": api.get("apiId"),
            "apiNm": api.get("apiNm"),
            "method": api.get("method"),
            "url": api.get("url"),
            "domain": api.get("domain"),
            "mockDomain": api.get("mockDomain"),
            "category": _category_for(api),
            "description": _strip_html(api.get("description") or ""),
        }

    def _detail(
        self,
        api: dict[str, Any],
        *,
        include_examples: bool = True,
        body_fields_only: bool = False,
    ) -> dict[str, Any]:
        req = _normalize_fields(api.get("requestIo"))
        res = _normalize_fields(api.get("responseIo"))
        if body_fields_only:
            # 헤더성 공통 필드(api-id, authorization, cont-yn, next-key) 제외
            headerish = {"api-id", "authorization", "cont-yn", "next-key"}
            req = [x for x in req if (x.get("itemId") or "").lower() not in headerish]
            res = [x for x in res if (x.get("itemId") or "").lower() not in headerish]
        out = self._summary(api)
        out.update(
            {
                "format": api.get("format"),
                "contentType": api.get("contentType"),
                "requestIo": req,
                "responseIo": res,
            }
        )
        if include_examples:
            out["requestExample"] = _parse_example(api.get("requestExample"))
            out["responseExample"] = _parse_example(api.get("responseExample"))
        return out

    def get(self, api_id: str, **kwargs: Any) -> dict[str, Any]:
        raw = (api_id or "").strip()
        if not raw:
            return {"status": "error", "message": "api_id required"}
        # 1) 정확 일치 2) 대소문자 무시
        api = self.apis.get(raw)
        matches = self._by_lower.get(raw.lower(), [])
        if api is None and len(matches) == 1:
            api = self.apis.get(matches[0])
        elif api is None and len(matches) > 1:
            return {
                "status": "ambiguous",
                "message": f"multiple apiId match (case): {raw}",
                "candidates": matches,
                "apis": [self._summary(self.apis[m]) for m in matches if m in self.apis],
            }
        if not api:
            hints = [k for k in self.apis if raw.lower() in k.lower()][:8]
            return {
                "status": "not_found",
                "message": f"api_id not found: {api_id}",
                "candidates": hints,
            }
        return {
            "status": "success",
            "api": self._detail(api, **kwargs),
        }

    def list_apis(
        self,
        *,
        prefix: Optional[str] = None,
        category: Optional[str] = None,
        url_contains: Optional[str] = None,
        limit: int = 100,
    ) -> dict[str, Any]:
        limit = max(1, min(int(limit or 100), 300))
        rows: list[dict[str, Any]] = []
        pref = (prefix or "").strip().lower()
        cat = (category or "").strip()
        url_q = (url_contains or "").strip().lower()
        for api in self.apis.values():
            aid = str(api.get("apiId") or "")
            if pref and not aid.lower().startswith(pref):
                continue
            if cat and _category_for(api) != cat and cat not in _category_for(api):
                continue
            if url_q and url_q not in str(api.get("url") or "").lower():
                continue
            rows.append(self._summary(api))
        rows.sort(key=lambda x: str(x.get("apiId") or ""))
        total = len(rows)
        return {
            "status": "success",
            "total_count": total,
            "showing": min(total, limit),
            "results": rows[:limit],
        }

    def search(self, query: str, limit: Optional[int] = None) -> dict[str, Any]:
        q = (query or "").strip()
        if not q:
            return {"status": "error", "message": "query required", "total_count": 0, "results": []}
        lim = max(1, min(int(limit or self.MAX_SEARCH), 50))
        q_lower = q.lower()
        tokens = [t for t in re.split(r"\s+", q_lower) if t]

        scored: list[tuple[int, dict[str, Any]]] = []
        for api in self.apis.values():
            aid = str(api.get("apiId") or "")
            anm = str(api.get("apiNm") or "")
            desc = _strip_html(api.get("description") or "")
            url = str(api.get("url") or "")
            cat = _category_for(api)
            field_blob = " ".join(
                f"{x.get('itemId','')} {x.get('itemNm','')} {x.get('desc','')}"
                for x in (api.get("requestIo") or []) + (api.get("responseIo") or [])
                if isinstance(x, dict)
            )
            hay = f"{aid} {anm} {desc} {url} {cat} {field_blob}".lower()

            score = 0
            if q_lower == aid.lower():
                score += 100
            elif aid.lower().startswith(q_lower):
                score += 60
            elif q_lower in aid.lower():
                score += 40
            if q_lower in anm.lower():
                score += 35
            if q_lower in desc.lower():
                score += 15
            if q_lower in url.lower():
                score += 20
            if q_lower in cat.lower():
                score += 10
            # 토큰 AND 매칭 가산
            if tokens and all(t in hay for t in tokens):
                score += 25 + 5 * len(tokens)
            elif tokens:
                hit = sum(1 for t in tokens if t in hay)
                if hit:
                    score += hit * 8
                else:
                    continue
            elif score == 0:
                continue
            scored.append((score, self._summary(api)))

        scored.sort(key=lambda x: (-x[0], str(x[1].get("apiId") or "")))
        results = [row for _, row in scored[:lim]]
        if not results:
            return {
                "status": "no_results",
                "message": f"No APIs matched: {query}",
                "total_count": 0,
                "results": [],
            }
        return {
            "status": "success",
            "message": f"Found {len(scored)} (showing {len(results)})",
            "total_count": len(scored),
            "results": results,
        }

    def lookup_error(self, code: str) -> dict[str, Any]:
        c = (code or "").strip()
        if not c:
            return {"status": "error", "message": "code required"}
        hits = []
        for row in self.error_codes:
            ec = str(row.get("errCode") or row.get("code") or "")
            em = str(row.get("errMsg") or row.get("message") or "")
            if c == ec or c.lower() in ec.lower() or c.lower() in em.lower():
                hits.append({"errCode": ec, "errMsg": _strip_html(em)})
        if not hits:
            return {"status": "no_results", "message": f"No error matched: {code}", "results": []}
        return {"status": "success", "total_count": len(hits), "results": hits[:30]}


@lru_cache(maxsize=1)
def get_index() -> KiwoomSpecIndex:
    path = os.environ.get("KIWOOM_SPEC_PATH") or DEFAULT_SPEC
    return KiwoomSpecIndex(path)


mcp = FastMCP(
    name="kiwoom-docs-mcp",
    version=VERSION,
    instructions=(
        "키움증권 REST API 문서(TR 스펙) 조회 전용 MCP다. "
        "사용자가 키움 API ID(ka/kt/us/au…), URL, 요청/응답 필드를 물을 때 "
        "반드시 이 도구로 스펙을 확인한 뒤 답하라. "
        "이 MCP는 실제 API를 호출하지 않는다. 주문/체결/토큰 발급을 수행하지 않는다."
    ),
)


@mcp.tool(
    name="kiwoom_api_stats",
    description="키움 REST 스펙 요약(총 API 수, 카테고리/접두사 분포). 탐색 시작 시 사용.",
)
def kiwoom_api_stats() -> dict[str, Any]:
    return {"status": "success", **get_index().stats()}


@mcp.tool(
    name="search_kiwoom_api",
    description=(
        "키움 REST API를 자연어/키워드로 검색한다. "
        "예: '일봉', 'ka10081', '잔고', 'chart', '해외 주문'. "
        "결과는 요약만 반환하므로, 상세 필드가 필요하면 get_kiwoom_api(api_id)를 이어서 호출하라."
    ),
)
def search_kiwoom_api(query: str, limit: int = 20) -> dict[str, Any]:
    return get_index().search(query, limit=limit)


@mcp.tool(
    name="get_kiwoom_api",
    description=(
        "apiId(예: ka10081, kt00018, au10001)로 키움 TR 전체 스펙을 반환한다. "
        "method/url/domain/requestIo/responseIo/예제 포함. "
        "body_fields_only=true 이면 공통 헤더 필드(api-id, authorization, cont-yn, next-key)를 제외한다."
    ),
)
def get_kiwoom_api(
    api_id: str,
    include_examples: bool = True,
    body_fields_only: bool = False,
) -> dict[str, Any]:
    return get_index().get(
        api_id,
        include_examples=include_examples,
        body_fields_only=body_fields_only,
    )


@mcp.tool(
    name="list_kiwoom_apis",
    description=(
        "키움 API 목록. prefix(ka|kt|us|au|0), category(국내_차트 등), url_contains(/api/dostk/chart)로 필터. "
        "카테고리 목록은 kiwoom_api_stats 참고."
    ),
)
def list_kiwoom_apis(
    prefix: str = "",
    category: str = "",
    url_contains: str = "",
    limit: int = 100,
) -> dict[str, Any]:
    return get_index().list_apis(
        prefix=prefix or None,
        category=category or None,
        url_contains=url_contains or None,
        limit=limit,
    )


@mcp.tool(
    name="lookup_kiwoom_error",
    description="키움 REST 에러코드/메시지 조회 (스펙의 errorCodeList).",
)
def lookup_kiwoom_error(code: str) -> dict[str, Any]:
    return get_index().lookup_error(code)


def main() -> None:
    # Cursor 등록은 stdio. --stdio 없어도 Cursor가 args로 줄 수 있어 기본 stdio.
    if "--http" in sys.argv:
        # 로컬 디버그용 (실매/운영 불필요)
        port = int(os.environ.get("PORT", "8082"))
        mcp.run(transport="http", host="127.0.0.1", port=port)
        return
    mcp.run(transport="stdio")


if __name__ == "__main__":
    main()