from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from typing import List

router = APIRouter(prefix="/api/watchlist", tags=["watchlist"])

# Intentionally duplicated from market_data.py to keep this system fully decoupled
# from the other instrument-list mechanisms (market_watchlist, INSTRUMENT_MODELS,
# instruments.json, options_vol watchlist-tickers).
_QUOTE_TYPE_TO_ASSET_CLASS = {
    "CURRENCY": "forex",
    "FUTURE": "energy",
    "INDEX": "indices",
    "ETF": "etfs",
    "EQUITY": "equities",
    "MUTUALFUND": "etfs",
}


@router.get("/")
def list_watchlist():
    from services.database import get_instruments_watchlist
    return get_instruments_watchlist()


@router.get("/quotes")
def watchlist_quotes():
    from services.database import get_instruments_watchlist
    from services.data_fetcher import get_quote
    items = []
    for row in get_instruments_watchlist():
        q = get_quote(row["ticker"]) or {}
        items.append({
            **row,
            "price": q.get("price"),
            "change_pct": q.get("change_pct"),
        })
    return {"items": items}


@router.post("/{ticker}")
def add_ticker(ticker: str):
    from services.data_fetcher import get_quote
    from services.database import get_instruments_watchlist, add_instrument_watchlist
    import yfinance as yf
    ticker = ticker.strip().upper()
    if any(row["ticker"] == ticker for row in get_instruments_watchlist()):
        raise HTTPException(409, f"'{ticker}' is already in the watchlist")
    q = get_quote(ticker)
    if not q or not q.get("price"):
        raise HTTPException(400, f"Ticker '{ticker}' not found on yfinance")
    name = ticker
    asset_class = "unknown"
    try:
        info = yf.Ticker(ticker).fast_info
        name = getattr(info, "long_name", None) or getattr(info, "short_name", None) or ticker
        quote_type = getattr(info, "quote_type", "") or ""
        asset_class = _QUOTE_TYPE_TO_ASSET_CLASS.get(quote_type.upper(), "unknown")
    except Exception:
        pass
    add_instrument_watchlist(ticker, name, asset_class)
    return {"ticker": ticker, "name": name, "asset_class": asset_class, "price": q["price"]}


@router.delete("/{ticker}")
def remove_ticker(ticker: str):
    from services.database import remove_instrument_watchlist
    remove_instrument_watchlist(ticker.strip().upper())
    return {"removed": ticker.strip().upper()}


class ReorderBody(BaseModel):
    tickers: List[str]


@router.put("/reorder")
def reorder(body: ReorderBody):
    from services.database import reorder_instruments_watchlist
    reorder_instruments_watchlist(body.tickers)
    return {"ok": True}