"""Actor creation and directory helpers — User and Actor remain separate concepts."""

from __future__ import annotations

from typing import Any, Literal, Optional

from psycopg2.extras import RealDictCursor

from db import get_connection

ActorType = Literal["human", "agent", "working_group", "external_system"]

ACTOR_TYPES = frozenset({"human", "agent", "working_group", "external_system"})


def _serialize_actor(row: dict[str, Any], *, include_user_id: bool = False) -> dict[str, Any]:
    result = {
        "id": str(row["id"]),
        "name": row["name"],
        "actor_type": row["actor_type"],
        "is_active": bool(row["is_active"]),
    }
    if include_user_id and row.get("user_id"):
        result["user_id"] = str(row["user_id"])
    return result


def create_actor(
    *,
    tenant_id: str,
    actor_type: ActorType,
    name: str,
    user_id: Optional[str] = None,
) -> dict[str, Any]:
    if actor_type == "human" and not user_id:
        raise ValueError("Human actors require user_id")
    if actor_type != "human" and user_id:
        raise ValueError("Non-human actors must not have user_id")

    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                INSERT INTO actors (tenant_id, actor_type, name, user_id)
                VALUES (%s, %s, %s, %s)
                RETURNING id, tenant_id, actor_type, name, user_id, is_active, created_at
                """,
                (tenant_id, actor_type, name, user_id),
            )
            row = dict(cur.fetchone())
        conn.commit()
        for key in ("id", "tenant_id", "user_id"):
            if row.get(key):
                row[key] = str(row[key])
        return row
    finally:
        conn.close()


def get_human_actor(tenant_id: str, user_id: str) -> Optional[dict[str, Any]]:
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, tenant_id, actor_type, name, user_id, is_active, created_at
                FROM actors
                WHERE tenant_id = %s AND user_id = %s AND actor_type = 'human'
                """,
                (tenant_id, user_id),
            )
            row = cur.fetchone()
            if not row:
                return None
            result = dict(row)
            for key in ("id", "tenant_id", "user_id"):
                if result.get(key):
                    result[key] = str(result[key])
            return result
    finally:
        conn.close()


def list_actors(
    *,
    tenant_id: str,
    actor_type: Optional[str] = None,
    include_inactive: bool = False,
    q: Optional[str] = None,
) -> list[dict[str, Any]]:
    if actor_type is not None and actor_type not in ACTOR_TYPES:
        raise ValueError(f"Ungültiger actor_type: {actor_type}")

    conditions = ["tenant_id = %s"]
    params: list[Any] = [tenant_id]

    if not include_inactive:
        conditions.append("is_active = TRUE")
    if actor_type:
        conditions.append("actor_type = %s")
        params.append(actor_type)
    if q:
        conditions.append("name ILIKE %s")
        params.append(f"%{q.strip()}%")

    where = " AND ".join(conditions)
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                f"""
                SELECT id, actor_type, name, user_id, is_active
                FROM actors
                WHERE {where}
                ORDER BY
                    CASE actor_type
                        WHEN 'human' THEN 0
                        WHEN 'working_group' THEN 1
                        WHEN 'agent' THEN 2
                        ELSE 3
                    END,
                    name
                """,
                params,
            )
            return [_serialize_actor(dict(row)) for row in cur.fetchall()]
    finally:
        conn.close()


def get_actor(*, tenant_id: str, actor_id: str) -> Optional[dict[str, Any]]:
    conn = get_connection()
    try:
        with conn.cursor(cursor_factory=RealDictCursor) as cur:
            cur.execute(
                """
                SELECT id, actor_type, name, user_id, is_active
                FROM actors
                WHERE id = %s AND tenant_id = %s
                """,
                (actor_id, tenant_id),
            )
            row = cur.fetchone()
            if not row:
                return None
            return _serialize_actor(dict(row))
    finally:
        conn.close()