"""
apps/metabase_registry/main.py
==============================

Setup completo de fn-registry en Metabase: datasource, cards y dashboard.

USO
---
Via variables de entorno:

    METABASE_URL=http://localhost:3000 \
    METABASE_ADMIN_EMAIL=admin@example.com \
    METABASE_ADMIN_PASSWORD=secret \
    REGISTRY_DB_PATH=/data/registry/registry.db \
    python main.py

Via argumentos CLI:

    python main.py \
        --url http://localhost:3000 \
        --admin-email admin@example.com \
        --admin-password secret \
        --registry-db-path /registry.db

Para crear un usuario nuevo (opcional):

    python main.py ... \
        --new-user-email dev@example.com \
        --new-user-first-name Dev \
        --new-user-last-name User \
        --new-user-password devpass

NOTA SOBRE registry.db EN DOCKER
----------------------------------
Metabase corre en Docker y necesita acceder a registry.db. El path que
se configura en Metabase (--registry-db-path) debe ser la ruta DENTRO
del contenedor. Usa setup_volume.sh para copiar el archivo al contenedor
antes de ejecutar este script.

  ./setup_volume.sh /home/lucas/fn_registry/registry.db

Tras copiar, el archivo queda en /registry.db dentro del contenedor,
que es el valor por defecto de --registry-db-path.

DEPENDENCIAS
------------
Instalar con:  pip install -r requirements.txt
O con uv:      uv pip install -r requirements.txt

Las funciones metabase_add_database y metabase_list_databases deben
existir en python/functions/metabase/databases.py (creadas por el
fn-constructor).
"""

import argparse
import os
import sys
import json

# Agregar el directorio de funciones Python al path
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "python", "functions"))

from metabase import (
    MetabaseClient,
    metabase_create_user,
    metabase_create_card,
    metabase_create_dashboard,
    metabase_update_dashboard,
)
from metabase.client import metabase_auth
from metabase.databases import metabase_add_database, metabase_list_databases


# ---------------------------------------------------------------------------
# Configuracion de cards de ejemplo
# ---------------------------------------------------------------------------

CARDS_CONFIG = [
    {
        "name": "Funciones por dominio",
        "description": "Cuenta de funciones agrupadas por dominio del registry",
        "sql": "SELECT domain, count(*) AS total FROM functions GROUP BY domain ORDER BY total DESC",
        "display": "bar",
    },
    {
        "name": "Funciones puras vs impuras",
        "description": "Distribucion de pureza funcional en el registry",
        "sql": "SELECT purity, count(*) AS total FROM functions GROUP BY purity ORDER BY total DESC",
        "display": "pie",
    },
    {
        "name": "Funciones por kind",
        "description": "Distribucion por tipo: function, pipeline, component",
        "sql": "SELECT kind, count(*) AS total FROM functions GROUP BY kind ORDER BY total DESC",
        "display": "bar",
    },
    {
        "name": "Buscar funciones",
        "description": "Lista completa de funciones con id, dominio, pureza y descripcion",
        "sql": (
            "SELECT id, domain, kind, purity, signature, description "
            "FROM functions ORDER BY domain, name"
        ),
        "display": "table",
    },
    {
        "name": "Tipos por dominio",
        "description": "Cuenta de tipos registrados por dominio",
        "sql": "SELECT domain, count(*) AS total FROM types GROUP BY domain ORDER BY total DESC",
        "display": "bar",
    },
    {
        "name": "Proposals pendientes",
        "description": "Proposals del registry que estan pendientes de revision",
        "sql": (
            "SELECT id, kind, title, created_by, created_at "
            "FROM proposals WHERE status = 'pending' ORDER BY created_at DESC"
        ),
        "display": "table",
    },
]


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def log(msg: str) -> None:
    print(f"[metabase_registry] {msg}", flush=True)


def log_ok(msg: str) -> None:
    print(f"[metabase_registry] OK  {msg}", flush=True)


def log_err(msg: str) -> None:
    print(f"[metabase_registry] ERR {msg}", file=sys.stderr, flush=True)


def find_existing_database(client: MetabaseClient, name: str) -> dict | None:
    """Busca una database por nombre en Metabase. Retorna None si no existe."""
    try:
        databases = metabase_list_databases(client)
        for db in databases:
            if db.get("name") == name:
                return db
    except Exception as e:
        log(f"No se pudo listar databases: {e}")
    return None


def build_dataset_query(database_id: int, sql: str) -> dict:
    """Construye el dataset_query para una card SQL nativa."""
    return {
        "type": "native",
        "database": database_id,
        "native": {
            "query": sql,
            "template-tags": {},
        },
    }


def create_cards(client: MetabaseClient, database_id: int) -> list[dict]:
    """Crea todas las cards de ejemplo. Retorna lista de cards creadas."""
    created = []
    for cfg in CARDS_CONFIG:
        log(f"Creando card: {cfg['name']!r} ...")
        try:
            card = metabase_create_card(
                client=client,
                name=cfg["name"],
                dataset_query=build_dataset_query(database_id, cfg["sql"]),
                display=cfg["display"],
                description=cfg["description"],
            )
            log_ok(f"Card creada: id={card['id']}  nombre={card['name']!r}")
            created.append(card)
        except Exception as e:
            log_err(f"No se pudo crear card {cfg['name']!r}: {e}")
    return created


def create_overview_dashboard(client: MetabaseClient, cards: list[dict]) -> dict | None:
    """Crea el dashboard 'fn-registry Overview' con todas las cards."""
    log("Creando dashboard 'fn-registry Overview' ...")
    try:
        dashboard = metabase_create_dashboard(
            client=client,
            name="fn-registry Overview",
            description="Vista general del function registry: funciones, tipos, proposals y metricas.",
        )
        log_ok(f"Dashboard creado: id={dashboard['id']}")
    except Exception as e:
        log_err(f"No se pudo crear dashboard: {e}")
        return None

    if not cards:
        log("Sin cards para agregar al dashboard.")
        return dashboard

    # Posicionar cards en una grilla de 3 columnas, 24 unidades de ancho total.
    # Cada card ocupa 8 columnas x 6 filas.
    cols = 3
    card_w = 8
    card_h = 6

    dashcards = []
    for idx, card in enumerate(cards):
        col = (idx % cols) * card_w
        row = (idx // cols) * card_h
        dashcards.append({
            "id": -(idx + 1),          # ID negativo = nueva dashcard
            "card_id": card["id"],
            "size_x": card_w,
            "size_y": card_h,
            "col": col,
            "row": row,
            "parameter_mappings": [],
            "visualization_settings": {},
        })

    try:
        metabase_update_dashboard(
            client=client,
            dashboard_id=dashboard["id"],
            dashcards=dashcards,
        )
        log_ok(f"Dashboard actualizado con {len(dashcards)} cards.")
    except Exception as e:
        log_err(f"No se pudo poblar el dashboard con cards: {e}")

    return dashboard


# ---------------------------------------------------------------------------
# Flujo principal
# ---------------------------------------------------------------------------

def run(args: argparse.Namespace) -> int:
    """Ejecuta el setup completo. Retorna 0 en exito, 1 en fallo critico."""

    # 1. Autenticar como admin
    log(f"Autenticando en {args.url} como {args.admin_email} ...")
    try:
        client = metabase_auth(args.url, args.admin_email, args.admin_password)
        log_ok("Autenticacion exitosa.")
    except Exception as e:
        log_err(f"Fallo de autenticacion: {e}")
        return 1

    with client:
        # 2. Crear usuario nuevo (opcional)
        if args.new_user_email:
            if not args.new_user_first_name or not args.new_user_last_name:
                log_err("Para crear usuario se requieren --new-user-first-name y --new-user-last-name.")
                return 1
            log(f"Creando usuario {args.new_user_email} ...")
            try:
                user = metabase_create_user(
                    client=client,
                    first_name=args.new_user_first_name,
                    last_name=args.new_user_last_name,
                    email=args.new_user_email,
                    password=args.new_user_password or "",
                )
                log_ok(f"Usuario creado: id={user['id']}  email={user['email']}")
            except Exception as e:
                log_err(f"No se pudo crear usuario: {e}")
                # No es critico, continuar

        # 3. Agregar registry.db como datasource SQLite
        db_name = "fn-registry"
        log(f"Verificando si ya existe la database {db_name!r} en Metabase ...")
        existing_db = find_existing_database(client, db_name)

        if existing_db:
            db_id = existing_db["id"]
            log_ok(f"Database ya existe: id={db_id}  nombre={db_name!r}. Se reutiliza.")
        else:
            log(f"Registrando registry.db ({args.registry_db_path}) como datasource SQLite ...")
            try:
                new_db = metabase_add_database(
                    client=client,
                    name=db_name,
                    engine="sqlite",
                    details={"db": args.registry_db_path},
                )
                db_id = new_db["id"]
                log_ok(f"Database registrada: id={db_id}  path={args.registry_db_path}")
            except Exception as e:
                log_err(f"No se pudo registrar la database: {e}")
                log_err(
                    "Verifica que registry.db este accesible desde el contenedor Docker. "
                    "Usa setup_volume.sh para copiar el archivo."
                )
                return 1

        # 4. Crear cards de ejemplo
        log(f"Creando {len(CARDS_CONFIG)} cards con database_id={db_id} ...")
        cards = create_cards(client, db_id)
        log(f"Cards creadas: {len(cards)}/{len(CARDS_CONFIG)}")

        # 5. Crear dashboard
        dashboard = create_overview_dashboard(client, cards)
        if dashboard:
            log_ok(
                f"Dashboard disponible en: {args.url}/dashboard/{dashboard['id']}"
            )
        else:
            log_err("El dashboard no pudo crearse.")

    summary = {
        "url": args.url,
        "database_id": db_id,
        "cards_created": len(cards),
        "dashboard_id": dashboard["id"] if dashboard else None,
        "dashboard_url": f"{args.url}/dashboard/{dashboard['id']}" if dashboard else None,
    }
    print("\n--- Resumen ---")
    print(json.dumps(summary, indent=2))

    return 0


# ---------------------------------------------------------------------------
# CLI / env vars
# ---------------------------------------------------------------------------

def build_parser() -> argparse.ArgumentParser:
    p = argparse.ArgumentParser(
        prog="metabase_registry",
        description="Setup de fn-registry como datasource en Metabase.",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog=__doc__,
    )

    # Conexion Metabase
    p.add_argument(
        "--url",
        default=os.environ.get("METABASE_URL", "http://localhost:3000"),
        help="URL base de Metabase (env: METABASE_URL). Default: http://localhost:3000",
    )
    p.add_argument(
        "--admin-email",
        default=os.environ.get("METABASE_ADMIN_EMAIL", "admin@example.com"),
        dest="admin_email",
        help="Email del admin (env: METABASE_ADMIN_EMAIL).",
    )
    p.add_argument(
        "--admin-password",
        default=os.environ.get("METABASE_ADMIN_PASSWORD", ""),
        dest="admin_password",
        help="Password del admin (env: METABASE_ADMIN_PASSWORD).",
    )

    # Registry DB path (ruta dentro del contenedor Docker)
    p.add_argument(
        "--registry-db-path",
        default=os.environ.get("REGISTRY_DB_PATH", "/data/registry/registry.db"),
        dest="registry_db_path",
        help=(
            "Ruta al registry.db DENTRO del contenedor Docker "
            "(env: REGISTRY_DB_PATH). Default: /registry.db"
        ),
    )

    # Nuevo usuario (todos opcionales)
    p.add_argument(
        "--new-user-email",
        default=os.environ.get("NEW_USER_EMAIL", ""),
        dest="new_user_email",
        help="Email del nuevo usuario a crear (env: NEW_USER_EMAIL). Opcional.",
    )
    p.add_argument(
        "--new-user-first-name",
        default=os.environ.get("NEW_USER_FIRST_NAME", ""),
        dest="new_user_first_name",
        help="Nombre del nuevo usuario (env: NEW_USER_FIRST_NAME).",
    )
    p.add_argument(
        "--new-user-last-name",
        default=os.environ.get("NEW_USER_LAST_NAME", ""),
        dest="new_user_last_name",
        help="Apellido del nuevo usuario (env: NEW_USER_LAST_NAME).",
    )
    p.add_argument(
        "--new-user-password",
        default=os.environ.get("NEW_USER_PASSWORD", ""),
        dest="new_user_password",
        help="Password del nuevo usuario (env: NEW_USER_PASSWORD). Opcional.",
    )

    return p


def main() -> None:
    parser = build_parser()
    args = parser.parse_args()

    if not args.admin_password:
        parser.error(
            "Se requiere la password del admin. "
            "Usa --admin-password o la variable de entorno METABASE_ADMIN_PASSWORD."
        )

    sys.exit(run(args))


if __name__ == "__main__":
    main()