"""Steering API — methods, profiles and context (AP1.1 / AP2.0)."""

from __future__ import annotations

from typing import Optional

from capabilities import require_capability
from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel, Field
from method_profiles.registry import list_method_profiles
from services import initiatives as initiative_service
from services import steering_context as sc_service
from steering.context import get_steering_context_dto
from steering.methods.registry import list_methods
from tenant_context import TenantContext

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


class SteeringContextUpdateRequest(BaseModel):
    method_key: Optional[str] = Field(default=None, min_length=1)
    method_profile_key: Optional[str] = Field(default=None, min_length=1)
    clear_method_profile: bool = False


@router.get("/methods")
def list_steering_methods(
    ctx: TenantContext = Depends(require_capability("kairo.initiative.read")),
):
    _ = ctx
    return [
        {
            "key": m.key,
            "version": m.version,
            "label": m.label,
            "description": m.description,
            "next_action_strategy_key": m.next_action_strategy_key,
        }
        for m in list_methods()
    ]


@router.get("/method-profiles")
def list_steering_method_profiles(
    initiative_archetype_key: Optional[str] = Query(default=None),
    ctx: TenantContext = Depends(require_capability("kairo.initiative.read")),
):
    _ = ctx
    return [
        {
            "key": p["key"],
            "label": p["label"],
            "description": p["description"],
            "initiative_archetype_key": p["initiative_archetype_key"],
            "method_key": p["method_key"],
        }
        for p in list_method_profiles(initiative_archetype_key=initiative_archetype_key)
    ]


@router.patch("/initiatives/{initiative_id}/context")
def patch_initiative_steering_context(
    initiative_id: str,
    body: SteeringContextUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.initiative.manage")),
):
    initiative = initiative_service.get_initiative(
        tenant_id=ctx.tenant_id, initiative_id=initiative_id
    )
    if not initiative:
        raise HTTPException(status_code=404, detail="Vorhaben nicht gefunden")

    if not body.method_key and not body.method_profile_key and not body.clear_method_profile:
        raise HTTPException(
            status_code=400,
            detail="method_key, method_profile_key oder clear_method_profile erforderlich",
        )

    try:
        if body.clear_method_profile:
            sc_service.update_method_profile_key(
                tenant_id=ctx.tenant_id,
                initiative_id=initiative_id,
                method_profile_key=None,
                user_id=ctx.user_id,
            )
        elif body.method_profile_key:
            sc_service.update_method_profile_key(
                tenant_id=ctx.tenant_id,
                initiative_id=initiative_id,
                method_profile_key=body.method_profile_key,
                user_id=ctx.user_id,
            )
        elif body.method_key:
            sc_service.update_method_key(
                tenant_id=ctx.tenant_id,
                initiative_id=initiative_id,
                method_key=body.method_key,
                user_id=ctx.user_id,
            )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc

    return get_steering_context_dto(ctx, initiative_id=initiative_id)