# app/main.py
import argparse, os, json
from pathlib import Path
from dotenv import dotenv_values
import pandas as pd

from app.ingest import ingest
from app.search import search
from app.paths import DATA_DIR, DOCSTORE_DIR, INDEX_DIR, EXPORT_DIR  # ← canonical paths


def get_env():
    """
    Load environment with safe, repo-relative defaults from app.paths.
    - Honors .env (dotenv) and real env vars if set.
    - Falls back to ./data, ./data/docstore, ./data/index, ./data/exports
      which work on macOS AND Hugging Face Spaces.
    """
    # 1) Start with .env (if present)
    env = dict(dotenv_values(".env") or {})

    # 2) Merge in process env (so Space secrets / shell vars override .env)
    for k, v in os.environ.items():
        env[k] = v

    # 3) Provide safe defaults from app.paths if not specified
    env.setdefault("DATA_DIR",     str(DATA_DIR))
    env.setdefault("DOCSTORE_DIR", str(DOCSTORE_DIR))
    env.setdefault("INDEX_DIR",    str(INDEX_DIR))
    env.setdefault("EXPORT_DIR",   str(EXPORT_DIR))

    # Optional UI/debug flags
    env.setdefault("SHOW_DEV", "0")

    # 4) Ensure directories exist
    for k in ("DATA_DIR", "DOCSTORE_DIR", "INDEX_DIR", "EXPORT_DIR"):
        Path(env[k]).mkdir(parents=True, exist_ok=True)

    return env


def ensure_index_exists(env: dict):
    """
    Ensure a FAISS index exists in env['INDEX_DIR'].
    If missing, run a minimal ingest using config/sources.yaml.
    """
    index_dir = Path(env["INDEX_DIR"])
    faiss_idx = index_dir / "faiss.index"
    meta_json = index_dir / "meta.json"

    if faiss_idx.exists() and meta_json.exists():
        return  # already built

    print("Index not found. Building now via ingest() …")
    # Ingest reads config and writes index/meta/docstore
    # If your ingest needs API keys, set them in Space Settings → Variables
    path, n = ingest("config/sources.yaml", env)
    print(f"Ingest complete. {n} records. Docstore: {path}")


def cmd_ingest(_args):
    env = get_env()
    path, n = ingest("config/sources.yaml", env)
    print(f"Ingest complete. {n} records. Docstore: {path}")


def cmd_search(args):
    env = get_env()
    ensure_index_exists(env)
    filters = {}
    if args.geo:
        filters["geo"] = args.geo.split(",")
    if args.categories:
        filters["categories"] = args.categories.split(",")
    res = search(args.q, env, top_k=args.k, filters=filters)
    for r in res:
        geo = r.get("geo")
        if isinstance(geo, list):
            geo = ",".join(geo)
        print(f"- {r.get('title','(no title)')} [{r.get('source','')}] ({geo}) score={r.get('score',0):.3f}")
        print(f"  {r.get('url','')}")


def cmd_export(args):
    env = get_env()
    ensure_index_exists(env)
    filters = {}
    if args.geo:
        filters["geo"] = args.geo.split(",")
    if args.categories:
        filters["categories"] = args.categories.split(",")
    res = search(args.q, env, top_k=args.k, filters=filters)
    out = Path(env["EXPORT_DIR"]) / (args.out or "results.csv")
    pd.DataFrame(res).to_csv(out, index=False)
    print(f"Exported {len(res)} rows to {out}")


if __name__ == "__main__":
    p = argparse.ArgumentParser()
    sub = p.add_subparsers(dest="cmd")

    p_ing = sub.add_parser("ingest", help="Ingest sources and build index")
    p_ing.set_defaults(func=cmd_ingest)

    p_search = sub.add_parser("search", help="Search index")
    p_search.add_argument("--q", required=True)
    p_search.add_argument("--k", type=int, default=15)
    p_search.add_argument("--geo", default="")
    p_search.add_argument("--categories", default="")
    p_search.set_defaults(func=cmd_search)

    p_export = sub.add_parser("export", help="Export search results to CSV")
    p_export.add_argument("--q", required=True)
    p_export.add_argument("--k", type=int, default=50)
    p_export.add_argument("--geo", default="")
    p_export.add_argument("--categories", default="")
    p_export.add_argument("--out", default="results.csv")
    p_export.set_defaults(func=cmd_export)

    args = p.parse_args()
    if not args.cmd:
        p.print_help()
    else:
        args.func(args)