from typing import Any

from app.reminders_scoped.service import RemindersService
from app.tools._dispatch import NOT_HANDLED, ToolContext

TOOL_NAMES = frozenset({
    "list_reminders",
    "create_reminder",
    "update_reminder",
    "delete_reminder",
    "complete_reminder",
})

TOOL_DEFINITIONS: list[dict[str, Any]] = [
    {
        "type": "function",
        "function": {
            "name": "list_reminders",
            "description": "Список активных напоминаний. «Что напомнил», «мои напоминания».",
            "parameters": {
                "type": "object",
                "properties": {
                    "limit": {"type": "integer", "description": "Макс. записей, по умолчанию 20"},
                },
                "required": [],
            },
        },
    },
    {
        "type": "function",
        "function": {
            "name": "create_reminder",
            "description": (
                "Создать напоминание. due_at — ISO datetime в часовом поясе пользователя "
                "(см. [Текущее время]). Примеры: через 15 мин, завтра 09:00, 2027-05-12T12:16:00."
            ),
            "parameters": {
                "type": "object",
                "properties": {
                    "title": {"type": "string", "description": "О чём напомнить"},
                    "due_at": {"type": "string", "description": "ISO datetime"},
                    "notes": {"type": "string"},
                    "all_day": {"type": "boolean"},
                    "recurrence": {
                        "type": "string",
                        "enum": ["none", "daily", "weekly", "monthly", "yearly"],
                        "description": "Повтор (yearly — день рождения, Новый год)",
                    },
                },
                "required": ["title", "due_at"],
            },
        },
    },
    {
        "type": "function",
        "function": {
            "name": "update_reminder",
            "description": "Изменить напоминание по id.",
            "parameters": {
                "type": "object",
                "properties": {
                    "reminder_id": {"type": "integer"},
                    "title": {"type": "string"},
                    "due_at": {"type": "string"},
                    "notes": {"type": "string"},
                    "all_day": {"type": "boolean"},
                    "recurrence": {
                        "type": "string",
                        "enum": ["none", "daily", "weekly", "monthly", "yearly"],
                    },
                    "enabled": {"type": "boolean"},
                },
                "required": ["reminder_id"],
            },
        },
    },
    {
        "type": "function",
        "function": {
            "name": "delete_reminder",
            "description": "Удалить напоминание по id.",
            "parameters": {
                "type": "object",
                "properties": {"reminder_id": {"type": "integer"}},
                "required": ["reminder_id"],
            },
        },
    },
    {
        "type": "function",
        "function": {
            "name": "complete_reminder",
            "description": "Отметить напоминание выполненным (снять с календаря).",
            "parameters": {
                "type": "object",
                "properties": {"reminder_id": {"type": "integer"}},
                "required": ["reminder_id"],
            },
        },
    },
]


async def execute(name: str, arguments: dict[str, Any], ctx: ToolContext) -> Any:
    if name not in TOOL_NAMES:
        return NOT_HANDLED

    reminders = RemindersService(ctx.db, ctx.user_id)

    if name == "list_reminders":
        return reminders.list_upcoming(limit=int(arguments.get("limit") or 20))
    if name == "create_reminder":
        return reminders.create(
            title=arguments.get("title", ""),
            due_at=arguments.get("due_at", ""),
            notes=arguments.get("notes", ""),
            all_day=bool(arguments.get("all_day", False)),
            recurrence=arguments.get("recurrence", "none"),
        )
    if name == "update_reminder":
        return reminders.update(
            int(arguments["reminder_id"]),
            title=arguments.get("title"),
            due_at=arguments.get("due_at"),
            notes=arguments.get("notes"),
            all_day=arguments.get("all_day"),
            recurrence=arguments.get("recurrence"),
            enabled=arguments.get("enabled"),
        )
    if name == "delete_reminder":
        return reminders.delete(int(arguments["reminder_id"]))
    if name == "complete_reminder":
        return reminders.complete(int(arguments["reminder_id"]))
    return NOT_HANDLED