from collections.abc import Mapping
from datetime import UTC, datetime
from typing import Any

from core.mongodb import get_database
from models.example import AddonExampleCreateInput, AddonExampleDocument
from motor.motor_asyncio import AsyncIOMotorCollection

COLLECTION_NAME = "addon_examples"


def utcnow() -> datetime:
    return datetime.now(UTC)


async def collection() -> AsyncIOMotorCollection[dict[str, Any]]:
    database = await get_database()
    return database[COLLECTION_NAME]


def deserialize(raw: Mapping[str, Any] | None) -> AddonExampleDocument | None:
    if raw is None:
        return None
    document = dict(raw)
    document.pop("_id", None)
    return AddonExampleDocument.model_validate(document)


async def ensure_example_indexes() -> None:
    examples = await collection()
    await examples.create_index("id", unique=True, name="uq_addon_example_id")


async def list_custom_examples() -> list[AddonExampleDocument]:
    examples = await collection()
    cursor = examples.find({}).sort("name", 1)

    result: list[AddonExampleDocument] = []
    async for raw in cursor:
        example = deserialize(raw)
        if example is not None:
            result.append(example)
    return result


async def create_custom_example(
    payload: AddonExampleCreateInput,
) -> AddonExampleDocument:
    now = utcnow()
    example = AddonExampleDocument(
        id=payload.id,
        name=payload.name,
        description=payload.description,
        category=payload.category,
        code=payload.code,
        source_url=payload.source_url,
        built_in=False,
        created_at=now,
        updated_at=now,
    )

    examples = await collection()
    await examples.insert_one(example.model_dump(exclude_none=True))
    return example


async def delete_custom_example(example_id: str) -> bool:
    examples = await collection()
    result = await examples.delete_one({"id": example_id})
    return result.deleted_count > 0