"""Initiative (Vorhaben) API — AP0.5."""

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 actions as action_service
from services import initiatives as initiative_service
from tenant_context import TenantContext

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


class InitiativeCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    goal: str = ""
    status: Literal["active", "paused", "completed", "archived"] = "active"
    priority: Literal["low", "normal", "high"] = "normal"
    owner_actor_id: Optional[str] = None


class InitiativeUpdateRequest(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=255)
    goal: Optional[str] = None
    status: Optional[Literal["active", "paused", "completed", "archived"]] = None
    priority: Optional[Literal["low", "normal", "high"]] = None
    owner_actor_id: Optional[str] = None


class ActionCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    description: str = ""
    status: Literal["open", "in_progress", "blocked", "done", "discarded"] = "open"
    priority: Literal["low", "normal", "high"] = "normal"
    assigned_actor_ids: list[str] = Field(default_factory=list)


@router.get("")
def list_initiatives(
    ctx: TenantContext = Depends(require_capability("kairo.initiative.read")),
):
    return initiative_service.list_initiatives(tenant_id=ctx.tenant_id)


@router.post("", status_code=201)
def create_initiative(
    body: InitiativeCreateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.initiative.manage")),
):
    owner_actor_id = body.owner_actor_id or ctx.actor_id
    if not owner_actor_id:
        raise HTTPException(status_code=400, detail="Kein Actor im TenantContext")
    try:
        return initiative_service.create_initiative(
            tenant_id=ctx.tenant_id,
            title=body.title,
            goal=body.goal,
            status=body.status,
            priority=body.priority,
            owner_actor_id=owner_actor_id,
            user_id=ctx.user_id,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.get("/{initiative_id}")
def get_initiative(
    initiative_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.initiative.read")),
):
    item = initiative_service.get_initiative(
        tenant_id=ctx.tenant_id, initiative_id=initiative_id
    )
    if not item:
        raise HTTPException(status_code=404, detail="Vorhaben nicht gefunden")
    return item


@router.patch("/{initiative_id}")
def update_initiative(
    initiative_id: str,
    body: InitiativeUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.initiative.manage")),
):
    try:
        item = initiative_service.update_initiative(
            tenant_id=ctx.tenant_id,
            initiative_id=initiative_id,
            user_id=ctx.user_id,
            title=body.title,
            goal=body.goal,
            status=body.status,
            priority=body.priority,
            owner_actor_id=body.owner_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="Vorhaben nicht gefunden")
    return item


@router.delete("/{initiative_id}", status_code=204)
def delete_initiative(
    initiative_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.initiative.manage")),
):
    if not initiative_service.delete_initiative(
        tenant_id=ctx.tenant_id,
        initiative_id=initiative_id,
        user_id=ctx.user_id,
    ):
        raise HTTPException(status_code=404, detail="Vorhaben nicht gefunden")


@router.get("/{initiative_id}/actions")
def list_initiative_actions(
    initiative_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.action.read")),
):
    if not initiative_service.get_initiative(
        tenant_id=ctx.tenant_id, initiative_id=initiative_id
    ):
        raise HTTPException(status_code=404, detail="Vorhaben nicht gefunden")
    return action_service.list_actions_for_initiative(
        tenant_id=ctx.tenant_id, initiative_id=initiative_id
    )


@router.post("/{initiative_id}/actions", status_code=201)
def create_initiative_action(
    initiative_id: str,
    body: ActionCreateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    try:
        return action_service.create_action(
            tenant_id=ctx.tenant_id,
            initiative_id=initiative_id,
            title=body.title,
            description=body.description,
            status=body.status,
            priority=body.priority,
            assigned_actor_ids=body.assigned_actor_ids,
            user_id=ctx.user_id,
        )
    except ValueError as exc:
        detail = str(exc)
        if detail == "Initiative nicht gefunden":
            raise HTTPException(status_code=404, detail=detail) from exc
        raise HTTPException(status_code=400, detail=detail) from exc