"""Task → Workstream integration (F-TASK-WORK).

Posts task_card and goal_card blocks to the communication system so tasks
and goals appear in the workstream with live status and progress.
"""

from __future__ import annotations

import logging
import uuid
from typing import Any

from sqlalchemy.ext.asyncio import AsyncSession

from app.plugins.builtins.tasks.models import Task

logger = logging.getLogger(__name__)


def _task_card_data(task: Task) -> dict[str, Any]:
    """Build a task_card block payload for a task."""
    return {
        "task_id": str(task.id),
        "title": task.title,
        "status": task.status,
        "priority": task.priority,
        "task_type": task.task_type,
        "assignee_type": task.assignee_type,
        "assignee_id": str(task.assignee_id) if task.assignee_id else None,
        "entity_type": task.entity_type,
        "entity_id": str(task.entity_id) if task.entity_id else None,
        "parent_task_id": str(task.parent_task_id) if task.parent_task_id else None,
        "due_date": task.due_date.isoformat() if task.due_date else None,
        "progress": task.progress or 0,
    }


def _goal_card_data(task: Task) -> dict[str, Any]:
    """Build a goal_card block payload for a goal/milestone."""
    return {
        "goal_id": str(task.id),
        "title": task.title,
        "status": task.status,
        "task_type": task.task_type,
        "progress": task.progress or 0,
        "target_date": task.target_date.isoformat() if task.target_date else None,
        "success_criteria": task.success_criteria,
        "parent_task_id": str(task.parent_task_id) if task.parent_task_id else None,
    }


async def post_task_to_workstream(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    task: Task,
    *,
    actor_id: uuid.UUID | None = None,
    actor_type: str = "user",
    conversation_id: uuid.UUID | None = None,
    content: str | None = None,
) -> uuid.UUID | None:
    """Post a task_card block to the workstream.

    Returns the created message ID, or None if the communication system is
    unavailable.
    """
    try:
        from app.plugins.builtins.contracts import get_contract
        _komm = get_contract("kommunikation")
        if not _komm or not hasattr(_komm, "send_message"):
            logger.warning("kommunikation contract unavailable - skipping workstream post for task %s", task.id)
            return None
        send_message = _komm.send_message

        block_type = "goal_card" if task.task_type in ("goal", "milestone") else "task_card"
        block_data = _goal_card_data(task) if block_type == "goal_card" else _task_card_data(task)
        message_id = await send_message(
            db=db,
            tenant_id=tenant_id,
            sender_id=actor_id or task.created_by or task.id,
            sender_type=actor_type,
            conversation_id=conversation_id,
            content=content or f"{task.title} ({task.status})",
            blocks=[{"type": block_type, "data": block_data}],
            metadata={"source": "tasks", "task_id": str(task.id)},
        )
        return message_id
    except Exception:
        logger.exception("Failed to post task %s to workstream", task.id)
        return None


async def post_task_status_update(
    db: AsyncSession,
    tenant_id: uuid.UUID,
    task: Task,
    *,
    old_status: str | None = None,
    actor_id: uuid.UUID | None = None,
    actor_type: str = "user",
    conversation_id: uuid.UUID | None = None,
) -> uuid.UUID | None:
    """Post a status-change update to the workstream."""
    content = f"Status geändert: {task.title} → {task.status}"
    if old_status and old_status != task.status:
        content = f"Status geändert: {task.title} ({old_status} → {task.status})"
    return await post_task_to_workstream(
        db, tenant_id, task,
        actor_id=actor_id, actor_type=actor_type,
        conversation_id=conversation_id, content=content,
    )