"""Spook - Your homie."""

from __future__ import annotations

from typing import TYPE_CHECKING, Any

from homeassistant.components import script
from homeassistant.const import EVENT_COMPONENT_LOADED
from homeassistant.helpers import entity_registry as er

from ....entity_filtering import async_get_all_entity_ids, async_get_all_services
from ....repairs import AbstractSpookEntityComponentUnknownReferencesRepair
from ....template_extraction import (
    async_extract_entities_from_config,
    async_filter_known_entity_ids_with_templates,
)

if TYPE_CHECKING:
    from homeassistant.core import HomeAssistant


def extract_entities_from_trigger_config(config: dict[str, Any] | list) -> set[str]:
    """Extract entity IDs from a trigger config."""
    entities = set()

    if not config:
        return entities

    if isinstance(config, list):
        for item in config:
            entities.update(extract_entities_from_trigger_config(item))
        return entities

    if not isinstance(config, dict):
        return entities

    # Extract entity_id from trigger config
    if "entity_id" in config:
        entity_id = config["entity_id"]
        if isinstance(entity_id, str):
            entities.add(entity_id)
        elif isinstance(entity_id, list):
            entities.update([e for e in entity_id if isinstance(e, str)])

    # Recursively process nested configs
    for value in config.values():
        if isinstance(value, (dict, list)):
            entities.update(extract_entities_from_trigger_config(value))

    return entities


def extract_referenced_entities_from_script(entity: script.ScriptEntity) -> set[str]:
    """Return entity references from a script entity."""
    try:
        return set(entity.script.referenced_entities)
    except TypeError as err:
        if str(err) != "unhashable type: 'dict'":
            raise
        return set()


async def extract_template_entities_from_script_entity(
    hass: HomeAssistant,
    entity: Any,
    known_services: set[str] | None = None,
) -> set[str]:
    """Extract entities from script configuration using Template analysis.

    This function finds template strings in script configuration and creates
    Template objects to extract entity references using Template.async_render_to_info().
    This provides more comprehensive entity detection than regex-based parsing alone.

    ``known_services`` is built once per inspection and handed down, because
    building it flattens every service Home Assistant has and every script
    with a template in it needs the same answer.
    """
    # Get the script configuration
    config = None
    if hasattr(entity, "script"):
        # Try to get configuration safely
        if hasattr(entity.script, "config"):
            config = entity.script.config
        elif hasattr(entity.script, "_config"):
            # Fallback to _config if needed
            config = getattr(entity.script, "_config", None)

    if not config:
        return set()

    return await async_extract_entities_from_config(hass, config, known_services)


class SpookRepair(AbstractSpookEntityComponentUnknownReferencesRepair):
    """Spook repair tries to find unknown referenced entity in scripts."""

    domain = script.DOMAIN
    repair = "script_unknown_entity_references"
    inspect_events = {
        EVENT_COMPONENT_LOADED,
        er.EVENT_ENTITY_REGISTRY_UPDATED,
    }
    inspect_config_entry_changed = True
    inspect_on_reload = True

    unavailable_entity_class = script.UnavailableScriptEntity
    entity_label = "script"
    reference_label = "entities"
    references_are_entities = True
    edit_url_pattern = "/config/script/edit/{unique_id}"

    _known_entity_ids: set[str]
    _known_services: set[str]

    def _get_blueprint_trigger_entities(self, entity: script.ScriptEntity) -> set[str]:
        """Extract entity references from blueprint trigger inputs."""
        entities = set()

        if (
            not hasattr(entity, "referenced_blueprint")
            or not entity.referenced_blueprint
        ):
            return entities

        config = getattr(entity, "_config", None)
        if not config or not isinstance(config, dict) or "use_blueprint" not in config:
            return entities

        blueprint_config = config["use_blueprint"]
        if "input" not in blueprint_config:
            return entities

        input_config = blueprint_config["input"]
        # Look for inputs that might contain triggers (like discard_when)
        for value in input_config.values():
            if isinstance(value, (dict, list)) and "trigger" in str(value):
                trigger_entities = extract_entities_from_trigger_config(value)
                if trigger_entities:
                    entities.update(trigger_entities)

        return entities

    async def _async_setup_inspection(self) -> None:
        """Cache what every script in this cycle needs looked up.

        The service set is in here for the same reason as the entity ids:
        building it flattens every service Home Assistant has, and it is the
        same answer for every script in one pass.
        """
        self._known_entity_ids = async_get_all_entity_ids(
            self.hass, include_all_none=True
        )
        self._known_services = async_get_all_services(self.hass)

    async def _async_compute_unknown_references(self, entity: Any) -> set[str]:
        """Return unknown entity IDs referenced by ``entity`` (incl. templates)."""
        # Get all referenced entities from the script
        all_entities = extract_referenced_entities_from_script(entity)

        # Check for blueprint trigger inputs
        all_entities.update(self._get_blueprint_trigger_entities(entity))

        # Extract entities from Template objects within the script entity
        all_entities.update(
            await extract_template_entities_from_script_entity(
                self.hass, entity, self._known_services
            )
        )

        return await async_filter_known_entity_ids_with_templates(
            self.hass,
            entity_ids=all_entities,
            known_entity_ids=self._known_entity_ids,
            known_services=self._known_services,
        )