"""Resolve fund investment objectives + categories.

Usage:
    python -m fundlab.fundinfo SYMBOL [SYMBOL ...] [--refresh] [--no-curate] [--max-docs N]

Objective sources, in priority order:
  1. funds_curated.json (human-verified, in this package) — used unless
     --no-curate. Authoritative for the well-known benchmark funds.
  2. SEC EDGAR — the fund's longName (from the Yahoo chart JSON in the
     data root, default ~/prog/fin/stocks) is searched over prospectus /
     annual-report forms; the objective is extracted from the fund's own
     filing and the fund classified.

Everything is merged into funds.json next to the repository root. Cached
EDGAR entries are reused unless --refresh is given. Be polite to the SEC:
one fund takes ~5-15 requests; run a handful at a time.
"""

from __future__ import annotations

import argparse
import json
import sys
from datetime import date
from pathlib import Path

from .edgar import extract_strategy, fetch_fund, sec_get, to_text

DATA_ROOT = Path("~/prog/fin/stocks").expanduser()
FUNDS_FILE = Path(__file__).resolve().parent.parent / "funds.json"
CURATED_FILE = Path(__file__).resolve().parent / "funds_curated.json"


def load_curated() -> dict:
    if CURATED_FILE.exists():
        try:
            return json.loads(CURATED_FILE.read_text())
        except Exception:
            pass
    return {}


def long_name(sym: str, root: Path) -> str | None:
    f = root / f"{sym}.json"
    if not f.exists():
        return None
    try:
        meta = json.loads(f.read_text())["chart"]["result"][0]["meta"]
        return meta.get("longName") or meta.get("shortName")
    except Exception:
        return None


def main(argv: list[str] | None = None) -> int:
    ap = argparse.ArgumentParser(prog="fundlab.fundinfo")
    ap.add_argument("symbols", nargs="*",
                    help="fund ticker(s), e.g. vtsax vwo (required unless --strategy)")
    ap.add_argument("--refresh", action="store_true",
                    help="re-fetch from EDGAR even if present in funds.json")
    ap.add_argument("--no-curate", action="store_true",
                    help="ignore funds_curated.json and use EDGAR for everything")
    ap.add_argument("--strategy", action="store_true",
                    help="fill in the 'strategy' field for funds.json entries "
                         "that have an EDGAR url (no objective fetching)")
    ap.add_argument("--data-root", default=str(DATA_ROOT))
    ap.add_argument("--max-docs", type=int, default=10,
                    help="max EDGAR documents to try per fund")
    args = ap.parse_args(argv)

    if args.strategy:
        if not FUNDS_FILE.exists():
            print("no funds.json", file=sys.stderr)
            return 1
        funds = json.loads(FUNDS_FILE.read_text())
        rc = 0
        for sym, rec in funds.items():
            url = rec.get("url")
            if not url:
                continue
            if rec.get("strategy") and not args.refresh:
                print(f"= {sym}: strategy cached")
                continue
            try:
                txt = to_text(sec_get(url))
            except Exception as e:
                print(f"= {sym}: fetch failed: {type(e).__name__}", file=sys.stderr)
                rc = 1
                continue
            strat = extract_strategy(txt)
            if strat:
                rec["strategy"] = strat
                print(f"= {sym}: strategy {len(strat)} chars")
            else:
                print(f"= {sym}: no strategy section found", file=sys.stderr)
        FUNDS_FILE.write_text(json.dumps(funds, indent=2))
        print(f"\n{FUNDS_FILE}")
        return rc

    if not args.strategy and not args.symbols:
        ap.error("symbols are required (or use --strategy)")

    root = Path(args.data_root)
    curated = {} if args.no_curate else load_curated()
    funds = {}
    if FUNDS_FILE.exists():
        try:
            funds = json.loads(FUNDS_FILE.read_text())
        except Exception:
            pass

    rc = 0
    for sym in args.symbols:
        sym = sym.lower()
        # 1) curated (authoritative) — always wins over cache/EDGAR
        if sym in curated:
            c = curated[sym]
            funds[sym] = {
                "name": c.get("name", ""),
                "objective": c["objective"],
                "category": c["category"],
                "source": "curated",
            }
            print(f"= {sym}: curated ({c['category']})")
            continue
        # 2) cached EDGAR result
        if not args.refresh and sym in funds and funds[sym].get("objective"):
            print(f"= {sym}: cached ({funds[sym].get('category')})")
            continue
        # 3) EDGAR
        name = long_name(sym, root)
        if not name:
            print(f"= {sym}: NO chart JSON in {root} — cannot identify fund",
                  file=sys.stderr)
            rc = 1
            continue
        print(f"= {sym}: fetching '{name}' from EDGAR ...", flush=True)
        try:
            res = fetch_fund(name, ticker=sym, max_docs=args.max_docs)
        except Exception as e:
            print(f"  ERROR: {type(e).__name__}: {e}", file=sys.stderr)
            rc = 1
            continue
        if not res:
            print(f"  no investment objective found in EDGAR", file=sys.stderr)
            rc = 1
            continue
        funds[sym] = {
            "name": name,
            "objective": res["objective"],
            "category": res["category"],
            "form": res["form"],
            "file_date": res["file_date"],
            "url": res["url"],
            "fetched": date.today().isoformat(),
            "source": "edgar",
        }
        print(f"  category: {res['category']}  [{res['form']} {res['file_date']}]")
        print(f"  objective: {res['objective']}")

    FUNDS_FILE.write_text(json.dumps(funds, indent=2))
    print(f"\n{FUNDS_FILE}")
    return rc


if __name__ == "__main__":
    sys.exit(main())