"""Milestone API — AP0.8d."""

from __future__ import annotations

from datetime import date
from typing import Literal, Optional

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

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


class MilestoneCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    goal_description: str = ""
    status: Literal["planned", "active", "at_risk", "reached", "moved", "discarded"] = "planned"
    target_date: Optional[date] = None


class MilestoneUpdateRequest(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=255)
    goal_description: Optional[str] = None
    status: Optional[
        Literal["planned", "active", "at_risk", "reached", "moved", "discarded"]
    ] = None
    target_date: Optional[date] = None
    clear_target_date: bool = False


@router.get("/{milestone_id}")
def get_milestone(
    milestone_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.read")),
):
    item = milestone_service.get_milestone(tenant_id=ctx.tenant_id, milestone_id=milestone_id)
    if not item:
        raise HTTPException(status_code=404, detail="Meilenstein nicht gefunden")
    return item


@router.patch("/{milestone_id}")
def update_milestone(
    milestone_id: str,
    body: MilestoneUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.manage")),
):
    try:
        item = milestone_service.update_milestone(
            tenant_id=ctx.tenant_id,
            milestone_id=milestone_id,
            user_id=ctx.user_id,
            title=body.title,
            goal_description=body.goal_description,
            status=body.status,
            target_date=body.target_date,
            clear_target_date=body.clear_target_date,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    if not item:
        raise HTTPException(status_code=404, detail="Meilenstein nicht gefunden")
    return item


@router.delete("/{milestone_id}", status_code=204)
def delete_milestone(
    milestone_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.manage")),
):
    if not milestone_service.delete_milestone(
        tenant_id=ctx.tenant_id, milestone_id=milestone_id, user_id=ctx.user_id
    ):
        raise HTTPException(status_code=404, detail="Meilenstein nicht gefunden")