"""generate_synthetic_eda_folder — fixture multi-tabla relacionado para el EDA de base/carpeta.

Funcion impura (escribe CSVs a disco) y determinista por ``seed``: crea una
carpeta con 3 CSV RELACIONADOS (customers, orders, reviews) cuyo contenido esta
disenado para que el motor AutomaticEDA multi-tabla / `profile_database` detecte
las relaciones FK por containment de valores (orders.customer_id y
reviews.customer_id contenidos al 100% en customers.customer_id, por encima del
``min_inclusion=0.9`` que usa la deteccion).

Reutiliza los helpers de ``generate_synthetic_eda_table`` (texto multi-idioma,
lat/lon validas, amount con outliers, listas fijas de paises/categorias) para no
reimplementar logica.

Estilo dict-no-throw del grupo `eda`: NUNCA lanza; devuelve
``{"status": "error", "error": str}`` ante cualquier fallo.
"""

import os

from .generate_synthetic_eda_table import (
    _CATEGORIES,
    _COUNTRIES,
    _amount_with_outliers,
    _make_fakers,
    _make_latlon,
    _make_reviews,
)


def generate_synthetic_eda_folder(out_dir, n_rows=2000, seed=42):
    """Genera una carpeta con 3 CSV relacionados (customers/orders/reviews).

    customers es la tabla padre (PK ``customer_id`` uuid unica). orders y reviews
    referencian ``customer_id`` muestreandolo de customers, de modo que TODOS sus
    valores estan contenidos en customers (inclusion 1.0 -> FK detectable).

    Funcion impura (escribe a disco) y determinista por ``seed``. NUNCA lanza.

    Args:
        out_dir: carpeta de salida. Se crea con ``mkdir -p`` si no existe.
        n_rows: numero de clientes (customers). orders ~= 2*n_rows, reviews ~= n_rows.
            Default 2000.
        seed: semilla para Faker y numpy. Default 42.

    Returns:
        dict dict-no-throw. En exito::

            {"status": "ok", "out_dir": ..., "files": {customers, orders, reviews},
             "n_customers": ..., "n_orders": ..., "n_reviews": ...,
             "expected_relations": [{from_table, from_col, to_table, to_col}, ...],
             "seed": seed}

        En error (sin lanzar)::

            {"status": "error", "error": str}
    """
    try:
        import numpy as np
        import pandas as pd

        n = int(n_rows)
        if n <= 0:
            return {"status": "error", "error": f"n_rows debe ser > 0, dado {n_rows!r}"}

        os.makedirs(out_dir, exist_ok=True)

        fakers = _make_fakers(seed)
        rng = np.random.default_rng(seed)

        # ---------------- customers (tabla padre) ----------------
        n_cust = n
        customer_ids = [fakers["en_US"].uuid4() for _ in range(n_cust)]
        names = [fakers["en_US"].name() for _ in range(n_cust)]
        cust_country = rng.choice(_COUNTRIES, n_cust)
        base = np.datetime64("2022-01-01")
        signup_offsets = rng.integers(0, 730, n_cust)
        signup_date = pd.to_datetime(base) + pd.to_timedelta(signup_offsets, unit="D")
        signup_iso = [d.strftime("%Y-%m-%d") for d in signup_date]
        lat, lon = _make_latlon(cust_country, rng)
        cust_email = [fakers["en_US"].email() for _ in range(n_cust)]

        customers = pd.DataFrame(
            {
                "customer_id": customer_ids,
                "name": names,
                "country": cust_country,
                "signup_date": signup_iso,
                "latitude": lat,
                "longitude": lon,
                "email": cust_email,
            }
        )

        # ---------------- orders (FK -> customers) ----------------
        n_orders = n_cust * 2
        order_ids = [fakers["en_US"].uuid4() for _ in range(n_orders)]
        order_cust = rng.choice(customer_ids, n_orders)  # subset/multiset de customers
        amount = _amount_with_outliers(n_orders, rng, n_extreme=10)
        order_cat = rng.choice(_CATEGORIES, n_orders)
        ts_offsets = rng.integers(0, 730 * 24 * 3600, n_orders)
        ts = pd.to_datetime(np.datetime64("2022-01-01T00:00:00")) + pd.to_timedelta(
            ts_offsets, unit="s"
        )
        ts_iso = [t.strftime("%Y-%m-%d %H:%M:%S") for t in ts]

        orders = pd.DataFrame(
            {
                "order_id": order_ids,
                "customer_id": order_cust,
                "amount": amount,
                "category": order_cat,
                "ts": ts_iso,
            }
        )

        # ---------------- reviews (FK -> customers) ----------------
        n_reviews = n_cust
        review_ids = [fakers["en_US"].uuid4() for _ in range(n_reviews)]
        # Subconjunto de customers (no todos) -> containment estricto ⊆ customers.
        rev_cust = rng.choice(customer_ids, n_reviews)
        review_text = _make_reviews(n_reviews, rng, fakers, null_frac=0.0)
        rating = rng.integers(1, 6, n_reviews)

        reviews = pd.DataFrame(
            {
                "review_id": review_ids,
                "customer_id": rev_cust,
                "review_text": review_text,
                "rating": rating,
            }
        )

        files = {
            "customers": os.path.join(out_dir, "customers.csv"),
            "orders": os.path.join(out_dir, "orders.csv"),
            "reviews": os.path.join(out_dir, "reviews.csv"),
        }
        customers.to_csv(files["customers"], index=False)
        orders.to_csv(files["orders"], index=False)
        reviews.to_csv(files["reviews"], index=False)

        return {
            "status": "ok",
            "out_dir": out_dir,
            "files": files,
            "n_customers": n_cust,
            "n_orders": n_orders,
            "n_reviews": n_reviews,
            "expected_relations": [
                {
                    "from_table": "orders",
                    "from_col": "customer_id",
                    "to_table": "customers",
                    "to_col": "customer_id",
                },
                {
                    "from_table": "reviews",
                    "from_col": "customer_id",
                    "to_table": "customers",
                    "to_col": "customer_id",
                },
            ],
            "seed": seed,
        }
    except Exception as exc:  # noqa: BLE001 — dict-no-throw del grupo eda.
        return {"status": "error", "error": str(exc)}


if __name__ == "__main__":
    import json
    import sys

    args = sys.argv[1:]
    out = args[0] if len(args) > 0 else "/tmp/synthetic_eda_folder"
    rows = int(args[1]) if len(args) > 1 else 2000
    sd = int(args[2]) if len(args) > 2 else 42
    print(json.dumps(generate_synthetic_eda_folder(out, rows, sd), indent=2))