"""Task item API — AP1.5."""

from __future__ import annotations

from datetime import datetime
from typing import Literal, Optional

from capabilities import require_capability
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from services import tasks as task_service
from tenant_context import TenantContext

router = APIRouter(prefix="/api/tasks", tags=["tasks"])


class TaskUpdateRequest(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=255)
    description: Optional[str] = None
    status: Optional[Literal["open", "in_progress", "done", "discarded"]] = None
    roadmap_item_id: Optional[str] = None
    clear_roadmap_item: bool = False
    sort_order: Optional[int] = None
    due_at: Optional[str] = None
    clear_due_at: bool = False


@router.patch("/{task_id}")
def update_task(
    task_id: str,
    body: TaskUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    due_at = None
    if body.due_at is not None:
        try:
            due_at = datetime.fromisoformat(body.due_at.replace("Z", "+00:00"))
        except ValueError as exc:
            raise HTTPException(status_code=400, detail="Ungültiges due_at") from exc
    try:
        item = task_service.update_task(
            tenant_id=ctx.tenant_id,
            task_id=task_id,
            user_id=ctx.user_id,
            title=body.title,
            description=body.description,
            status=body.status,
            roadmap_item_id=body.roadmap_item_id,
            clear_roadmap_item=body.clear_roadmap_item,
            sort_order=body.sort_order,
            due_at=due_at,
            clear_due_at=body.clear_due_at,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    if not item:
        raise HTTPException(status_code=404, detail="Task nicht gefunden")
    return item


@router.delete("/{task_id}", status_code=204)
def delete_task(
    task_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    if not task_service.delete_task(
        tenant_id=ctx.tenant_id, task_id=task_id, user_id=ctx.user_id
    ):
        raise HTTPException(status_code=404, detail="Task nicht gefunden")