"""Decision API — AP0.9c."""

from __future__ import annotations

from typing import Literal, Optional

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

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


class DecisionUpdateRequest(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=255)
    description: Optional[str] = None
    status: Optional[Literal["proposed", "decided", "superseded"]] = None
    outcome: Optional[str] = None
    decided_by_actor_id: Optional[str] = None


@router.get("/{decision_id}")
def get_decision(
    decision_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.decision.read")),
):
    item = decision_service.get_decision(tenant_id=ctx.tenant_id, decision_id=decision_id)
    if not item:
        raise HTTPException(status_code=404, detail="Entscheidung nicht gefunden")
    return item


@router.patch("/{decision_id}")
def update_decision(
    decision_id: str,
    body: DecisionUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.decision.manage")),
):
    try:
        item = decision_service.update_decision(
            tenant_id=ctx.tenant_id,
            decision_id=decision_id,
            user_id=ctx.user_id,
            title=body.title,
            description=body.description,
            status=body.status,
            outcome=body.outcome,
            decided_by_actor_id=body.decided_by_actor_id,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    if not item:
        raise HTTPException(status_code=404, detail="Entscheidung nicht gefunden")
    return item


@router.delete("/{decision_id}", status_code=204)
def delete_decision(
    decision_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.decision.manage")),
):
    if not decision_service.delete_decision(
        tenant_id=ctx.tenant_id, decision_id=decision_id, user_id=ctx.user_id
    ):
        raise HTTPException(status_code=404, detail="Entscheidung nicht gefunden")