"""Public contract for the tasks plugin.

Exposes only the symbols that other builtins plugins need.
Importers should use::

    from app.plugins.builtins.contracts import get_contract
    tasks = get_contract("tasks")
    if tasks:
        await tasks.create_task(db, tenant_id, user_id, data)

instead of importing from internal modules directly.
"""

from __future__ import annotations

from typing import Any

from sqlalchemy import or_, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.plugins.builtins.contracts import get_contract_registry
from app.plugins.builtins.tasks.models import Task
from app.plugins.builtins.tasks.services import (
    assign_task,
    create_task,
    delete_task,
    get_due_tasks,
    get_task,
    list_tasks,
    update_task,
    update_task_status,
)


class TasksContract:
    """Public API surface for the tasks plugin."""

    contract_name = "tasks"

    # ─── services ───
    list_tasks = staticmethod(list_tasks)
    get_task = staticmethod(get_task)
    create_task = staticmethod(create_task)
    update_task = staticmethod(update_task)
    delete_task = staticmethod(delete_task)
    assign_task = staticmethod(assign_task)
    update_task_status = staticmethod(update_task_status)
    get_due_tasks = staticmethod(get_due_tasks)

    # ─── models (read-only for queries) ───
    Task = Task

    @staticmethod
    async def dsar_collect(
        db: AsyncSession, tenant_id: Any, user_id: Any
    ) -> dict[str, Any]:
        """GDPR Art. 15: collect tasks owned by or assigned to the user."""
        tasks = (
            await db.execute(
                select(Task).where(
                    or_(Task.owner_id == user_id, Task.assigned_to == user_id),
                    Task.tenant_id == tenant_id,
                    Task.deleted_at.is_(None),
                ).limit(1000)
            )
        ).scalars().all()
        return {
            "tasks": [
                {
                    "id": str(t.id),
                    "title": t.title,
                    "status": t.status,
                    "priority": t.priority,
                    "due_date": t.due_date.isoformat() if t.due_date else None,
                }
                for t in tasks
            ]
        }


# ─── self-registration ───

_contract = TasksContract()
get_contract_registry().register("tasks", _contract)


__all__ = [
    "TasksContract",
    "Task",
    "list_tasks",
    "get_task",
    "create_task",
    "update_task",
    "delete_task",
    "assign_task",
    "update_task_status",
    "get_due_tasks",
]