"""Domain-global NestQuest service schemas and handlers (Feature 09).

Registration is domain-scoped and happens once (see
:func:`async_register_services`); handlers resolve a live database at
call time through the injected ``find_runtime`` callable.  Permission
checks are Feature 09 later tasks — this module only validates payload
shape and forwards to the Feature 03/06/08 business layers (and the
presence DAOs).  ``export_history_csv`` is registered with a schema but
raises until Feature 13.  ``regenerate`` is supplied by the caller so
the Feature 07 handler stays the one in ``__init__``.
"""
from __future__ import annotations

from collections.abc import Awaitable, Callable
from typing import Any

import voluptuous as vol
from homeassistant.core import HomeAssistant
from homeassistant.exceptions import HomeAssistantError

from . import children as children_layer
from . import completion as completion_layer
from . import quest_definitions as quest_definitions_layer
from .const import (
    DOMAIN,
    DOMAIN_SERVICES,
    QUEST_WINDOWS,
    SERVICE_COMPLETE_QUEST,
    SERVICE_CREATE_PRESENCE_OVERRIDE,
    SERVICE_CREATE_QUEST_DEFINITION,
    SERVICE_DELETE_PRESENCE_OVERRIDE,
    SERVICE_EXPORT_HISTORY_CSV,
    SERVICE_MANAGE_CHILD,
    SERVICE_REGENERATE,
    SERVICE_SET_PRESENCE_PATTERN,
    SERVICE_SET_QUEST_DEFINITION_ACTIVE,
    SERVICE_UNCOMPLETE_QUEST,
    SERVICE_UPDATE_QUEST_DEFINITION,
)
from .dao_presence import PresenceOverridesDao, PresenceSchedulesDao
from .presence import PresenceSchedule
from .recurrence import ScheduleRule

FindRuntime = Callable[[HomeAssistant], Any]
ServiceHandler = Callable[[Any], Awaitable[None]]

ACTOR_PANEL = "panel"
ACTOR_USER = "user"
MANAGE_CHILD_CREATE = "create"
MANAGE_CHILD_EDIT = "edit"
MANAGE_CHILD_SET_ACTIVE = "set_active"
MANAGE_CHILD_REORDER = "reorder"


def _strict_int(value: object) -> int:
    """Reject bools and non-ints; voluptuous ``int`` would accept True."""
    if isinstance(value, bool) or not isinstance(value, int):
        raise vol.Invalid(f"expected int, got {value!r}")
    return value


def _strict_bool(value: object) -> bool:
    """Reject ints and other truthy values; require a real bool."""
    if type(value) is not bool:
        raise vol.Invalid(f"expected bool, got {value!r}")
    return value


def _weekday_list(value: object) -> list[int]:
    if type(value) is not list:
        raise vol.Invalid(f"expected a list of weekday ints, got {value!r}")
    return [_strict_int(item) for item in value]


def _presence_pattern(value: object) -> dict[int, list[int]]:
    if not isinstance(value, dict):
        raise vol.Invalid(f"pattern must be a mapping, got {value!r}")
    pattern: dict[int, list[int]] = {}
    for week, days in value.items():
        if isinstance(week, str):
            try:
                week_index = int(week)
            except ValueError as err:
                raise vol.Invalid(
                    f"pattern week index must be an integer, got {week!r}"
                ) from err
            if str(week_index) != week:
                raise vol.Invalid(
                    f"pattern week index must be an integer, got {week!r}"
                )
        else:
            week_index = _strict_int(week)
        pattern[week_index] = _weekday_list(days)
    return pattern


def _window_entry(value: object) -> str | tuple[str, str | None]:
    if isinstance(value, str):
        if value not in QUEST_WINDOWS:
            raise vol.Invalid(f"unknown window {value!r}")
        return value
    if isinstance(value, dict):
        parsed = vol.Schema(
            {
                vol.Required("window"): vol.In(QUEST_WINDOWS),
                vol.Optional("due_time"): str,
            }
        )(value)
        due_time = parsed.get("due_time")
        if due_time is None:
            return parsed["window"]
        return (parsed["window"], due_time)
    raise vol.Invalid(
        f"windows entry must be a window name or object, got {value!r}"
    )


def _windows(value: object) -> list[str | tuple[str, str | None]]:
    if type(value) is not list:
        raise vol.Invalid(f"windows must be a list, got {value!r}")
    if not value:
        raise vol.Invalid("windows must not be empty")
    return [_window_entry(entry) for entry in value]


def _int_list(value: object) -> list[int]:
    if type(value) is not list:
        raise vol.Invalid(f"expected a list of ints, got {value!r}")
    return [_strict_int(item) for item in value]


def _rule_dict(value: object) -> dict:
    if not isinstance(value, dict):
        raise vol.Invalid(f"rule must be a dict, got {value!r}")
    return value


SCHEMA_COMPLETE_QUEST = vol.Schema(
    {
        vol.Required("instance_id"): _strict_int,
        vol.Required("actor"): vol.In([ACTOR_PANEL, ACTOR_USER]),
        vol.Optional("actor_child_id"): _strict_int,
        vol.Optional("actor_user_id"): str,
    }
)

SCHEMA_UNCOMPLETE_QUEST = SCHEMA_COMPLETE_QUEST

SCHEMA_CREATE_QUEST_DEFINITION = vol.Schema(
    {
        vol.Required("title"): str,
        vol.Required("rule"): _rule_dict,
        vol.Required("assignee_child_ids"): vol.All(
            _int_list, vol.Length(min=1)
        ),
        vol.Required("windows"): _windows,
        vol.Optional("description"): str,
        vol.Optional("icon"): str,
    }
)

SCHEMA_UPDATE_QUEST_DEFINITION = vol.Schema(
    {
        vol.Required("definition_id"): _strict_int,
        vol.Optional("title"): str,
        vol.Optional("description"): vol.Any(str, None),
        vol.Optional("icon"): vol.Any(str, None),
        vol.Optional("rule"): _rule_dict,
        vol.Optional("windows"): _windows,
    }
)

SCHEMA_SET_QUEST_DEFINITION_ACTIVE = vol.Schema(
    {
        vol.Required("definition_id"): _strict_int,
        vol.Required("is_active"): _strict_bool,
    }
)

SCHEMA_SET_PRESENCE_PATTERN = vol.Schema(
    {
        vol.Required("child_id"): _strict_int,
        vol.Required("cycle_length_weeks"): _strict_int,
        vol.Required("anchor_date"): str,
        vol.Required("pattern"): _presence_pattern,
    }
)

SCHEMA_CREATE_PRESENCE_OVERRIDE = vol.Schema(
    {
        vol.Required("child_id"): _strict_int,
        vol.Required("start_date"): str,
        vol.Required("end_date"): str,
        vol.Required("is_present"): _strict_bool,
        vol.Optional("note"): str,
    }
)

SCHEMA_DELETE_PRESENCE_OVERRIDE = vol.Schema(
    {
        vol.Required("override_id"): _strict_int,
    }
)

SCHEMA_EXPORT_HISTORY_CSV = vol.Schema({})

SCHEMA_MANAGE_CHILD = vol.Schema(
    {
        vol.Required("action"): vol.In(
            [
                MANAGE_CHILD_CREATE,
                MANAGE_CHILD_EDIT,
                MANAGE_CHILD_SET_ACTIVE,
                MANAGE_CHILD_REORDER,
            ]
        ),
        vol.Optional("child_id"): _strict_int,
        vol.Optional("display_name"): str,
        vol.Optional("colour"): str,
        vol.Optional("avatar_ref"): str,
        vol.Optional("sort_order"): _strict_int,
        vol.Optional("is_active"): _strict_bool,
        vol.Optional("ordered_ids"): _int_list,
    }
)


def _require_database(hass: HomeAssistant, find_runtime: FindRuntime):
    runtime = find_runtime(hass)
    if runtime is None:
        raise HomeAssistantError(
            "NestQuest has no live database; cannot run this service"
        )
    return runtime.database


def _actor_kwargs(call: Any) -> dict[str, Any]:
    actor = call.data["actor"]
    if actor == ACTOR_PANEL:
        actor_child_id = call.data.get("actor_child_id")
        if actor_child_id is None:
            raise HomeAssistantError(
                "actor_child_id is required when actor is panel"
            )
        return {
            "actor_source": ACTOR_PANEL,
            "actor_child_id": actor_child_id,
            "actor_user_id": None,
        }
    context = getattr(call, "context", None)
    user_id = getattr(context, "user_id", None) if context is not None else None
    if not user_id:
        user_id = call.data.get("actor_user_id")
    return {
        "actor_source": ACTOR_USER,
        "actor_user_id": user_id,
        "actor_child_id": None,
    }


def _with_errors(handler: ServiceHandler) -> ServiceHandler:
    async def _wrapped(call: Any) -> None:
        try:
            await handler(call)
        except HomeAssistantError:
            raise
        except ValueError as err:
            raise HomeAssistantError(str(err)) from err

    return _wrapped


def _complete_quest(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        await completion_layer.complete_instance(
            database,
            call.data["instance_id"],
            **_actor_kwargs(call),
        )

    return _with_errors(_handler)


def _uncomplete_quest(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        await completion_layer.uncomplete_instance(
            database,
            call.data["instance_id"],
            **_actor_kwargs(call),
        )

    return _with_errors(_handler)


def _create_quest_definition(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        data = call.data
        await quest_definitions_layer.create_quest_definition(
            database,
            data["title"],
            ScheduleRule.from_dict(data["rule"]),
            data["assignee_child_ids"],
            data["windows"],
            description=data.get("description"),
            icon=data.get("icon"),
        )

    return _with_errors(_handler)


def _update_quest_definition(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        data = call.data
        kwargs: dict[str, Any] = {}
        if "title" in data:
            kwargs["title"] = data["title"]
        if "description" in data:
            kwargs["description"] = data["description"]
        if "icon" in data:
            kwargs["icon"] = data["icon"]
        if "rule" in data:
            kwargs["rule"] = ScheduleRule.from_dict(data["rule"])
        if "windows" in data:
            kwargs["windows"] = data["windows"]
        await quest_definitions_layer.edit_quest_definition(
            database, data["definition_id"], **kwargs
        )

    return _with_errors(_handler)


def _set_quest_definition_active(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        await quest_definitions_layer.set_quest_definition_active(
            database,
            call.data["definition_id"],
            call.data["is_active"],
        )

    return _with_errors(_handler)


def _set_presence_pattern(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        data = call.data
        schedule = PresenceSchedule(
            data["child_id"],
            data["cycle_length_weeks"],
            data["anchor_date"],
            data["pattern"],
        )
        await PresenceSchedulesDao(database).upsert_by_child(
            schedule.child_id,
            schedule.cycle_length_weeks,
            schedule.anchor_date.isoformat(),
            schedule.encode(),
        )

    return _with_errors(_handler)


def _create_presence_override(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        data = call.data
        await PresenceOverridesDao(database).create(
            data["child_id"],
            data["start_date"],
            data["end_date"],
            data["is_present"],
            note=data.get("note"),
        )

    return _with_errors(_handler)


def _delete_presence_override(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        await PresenceOverridesDao(database).delete(call.data["override_id"])

    return _with_errors(_handler)


async def _export_history_csv(_call: Any) -> None:
    raise HomeAssistantError(
        "CSV history export is not implemented until Feature 13"
    )


def _manage_child(
    hass: HomeAssistant, find_runtime: FindRuntime
) -> ServiceHandler:
    async def _handler(call: Any) -> None:
        database = _require_database(hass, find_runtime)
        data = call.data
        action = data["action"]
        if action == MANAGE_CHILD_CREATE:
            display_name = data.get("display_name")
            if display_name is None:
                raise HomeAssistantError(
                    "display_name is required when action is create"
                )
            kwargs: dict[str, Any] = {}
            if "colour" in data:
                kwargs["colour"] = data["colour"]
            if "avatar_ref" in data:
                kwargs["avatar_ref"] = data["avatar_ref"]
            if "sort_order" in data:
                kwargs["sort_order"] = data["sort_order"]
            await children_layer.create_child(
                database, display_name, **kwargs
            )
            return
        if action == MANAGE_CHILD_EDIT:
            child_id = data.get("child_id")
            if child_id is None:
                raise HomeAssistantError(
                    "child_id is required when action is edit"
                )
            kwargs = {}
            if "display_name" in data:
                kwargs["display_name"] = data["display_name"]
            if "colour" in data:
                kwargs["colour"] = data["colour"]
            if "avatar_ref" in data:
                kwargs["avatar_ref"] = data["avatar_ref"]
            if "sort_order" in data:
                kwargs["sort_order"] = data["sort_order"]
            await children_layer.edit_child(database, child_id, **kwargs)
            return
        if action == MANAGE_CHILD_SET_ACTIVE:
            child_id = data.get("child_id")
            is_active = data.get("is_active")
            if child_id is None:
                raise HomeAssistantError(
                    "child_id is required when action is set_active"
                )
            if is_active is None:
                raise HomeAssistantError(
                    "is_active is required when action is set_active"
                )
            await children_layer.set_child_active(
                database, child_id, is_active
            )
            return
        ordered_ids = data.get("ordered_ids")
        if ordered_ids is None:
            raise HomeAssistantError(
                "ordered_ids is required when action is reorder"
            )
        await children_layer.reorder_children(database, ordered_ids)

    return _with_errors(_handler)


def async_register_services(
    hass: HomeAssistant,
    *,
    find_runtime: FindRuntime,
    regenerate_handler: ServiceHandler,
) -> None:
    """Register every canonical service once at domain scope."""
    if hass.services.has_service(DOMAIN, SERVICE_REGENERATE):
        return
    hass.services.async_register(
        DOMAIN, SERVICE_REGENERATE, regenerate_handler
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_COMPLETE_QUEST,
        _complete_quest(hass, find_runtime),
        schema=SCHEMA_COMPLETE_QUEST,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_UNCOMPLETE_QUEST,
        _uncomplete_quest(hass, find_runtime),
        schema=SCHEMA_UNCOMPLETE_QUEST,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_CREATE_QUEST_DEFINITION,
        _create_quest_definition(hass, find_runtime),
        schema=SCHEMA_CREATE_QUEST_DEFINITION,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_UPDATE_QUEST_DEFINITION,
        _update_quest_definition(hass, find_runtime),
        schema=SCHEMA_UPDATE_QUEST_DEFINITION,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_SET_QUEST_DEFINITION_ACTIVE,
        _set_quest_definition_active(hass, find_runtime),
        schema=SCHEMA_SET_QUEST_DEFINITION_ACTIVE,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_SET_PRESENCE_PATTERN,
        _set_presence_pattern(hass, find_runtime),
        schema=SCHEMA_SET_PRESENCE_PATTERN,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_CREATE_PRESENCE_OVERRIDE,
        _create_presence_override(hass, find_runtime),
        schema=SCHEMA_CREATE_PRESENCE_OVERRIDE,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_DELETE_PRESENCE_OVERRIDE,
        _delete_presence_override(hass, find_runtime),
        schema=SCHEMA_DELETE_PRESENCE_OVERRIDE,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_EXPORT_HISTORY_CSV,
        _export_history_csv,
        schema=SCHEMA_EXPORT_HISTORY_CSV,
    )
    hass.services.async_register(
        DOMAIN,
        SERVICE_MANAGE_CHILD,
        _manage_child(hass, find_runtime),
        schema=SCHEMA_MANAGE_CHILD,
    )


def async_deregister_services(hass: HomeAssistant) -> None:
    """Remove every canonical service when the last entry unloads."""
    for service in DOMAIN_SERVICES:
        if hass.services.has_service(DOMAIN, service):
            hass.services.async_remove(DOMAIN, service)