"""Ping explore type."""

from __future__ import annotations

from pathlib import Path
from typing import Any, Dict, Iterator, List, Optional

from ..views import PingView, View
from . import Explore


class PingExplore(Explore):
    """A Ping Table explore."""

    type: str = "ping_explore"

    def _to_lookml(self, v1_name: Optional[str]) -> List[Dict[str, Any]]:
        """Generate LookML to represent this explore."""
        explore_lookml = {
            "name": self.name,
            "view_name": self.views["base_view"],
            "always_filter": {
                "filters": self.get_required_filters("base_view"),
            },
            "joins": self.get_unnested_fields_joins_lookml(),
        }

        if datagroup := self.get_datagroup():
            explore_lookml["persist_with"] = datagroup

        return [explore_lookml]

    @staticmethod
    def from_views(views: List[View]) -> Iterator[PingExplore]:
        """Generate all possible PingExplores from the views."""
        for view in views:
            if view.view_type == PingView.type:
                yield PingExplore(view.name, {"base_view": view.name})

    @staticmethod
    def from_dict(name: str, defn: dict, views_path: Path) -> PingExplore:
        """Get an instance of this explore from a name and dictionary definition."""
        return PingExplore(name, defn["views"], views_path)