from datasette import hookimpl
from datasette.utils import actor_matches_allow


@hookimpl(tryfirst=True)
def permission_allowed(datasette, actor, action, resource):
    async def inner():
        if action == "permissions-debug":
            if actor and actor.get("id") == "root":
                return True
        elif action == "view-instance":
            allow = datasette.metadata("allow")
            if allow is not None:
                return actor_matches_allow(actor, allow)
        elif action == "view-database":
            database_allow = datasette.metadata("allow", database=resource)
            if database_allow is None:
                return None
            return actor_matches_allow(actor, database_allow)
        elif action == "view-table":
            database, table = resource
            tables = datasette.metadata("tables", database=database) or {}
            table_allow = (tables.get(table) or {}).get("allow")
            if table_allow is None:
                return None
            return actor_matches_allow(actor, table_allow)
        elif action == "view-query":
            # Check if this query has a "allow" block in metadata
            database, query_name = resource
            query = await datasette.get_canned_query(database, query_name, actor)
            assert query is not None
            allow = query.get("allow")
            if allow is None:
                return None
            return actor_matches_allow(actor, allow)
        elif action == "execute-sql":
            # Use allow_sql block from database block, or from top-level
            database_allow_sql = datasette.metadata("allow_sql", database=resource)
            if database_allow_sql is None:
                database_allow_sql = datasette.metadata("allow_sql")
            if database_allow_sql is None:
                return None
            return actor_matches_allow(actor, database_allow_sql)

    return inner