"""Milestone service — Kompatibilitäts-Wrapper auf RoadmapItems (AP0.8d → AP1.4)."""

from __future__ import annotations

from datetime import date
from typing import Any, Literal, Optional

from services import roadmap as roadmap_service

MilestoneStatus = Literal[
    "planned", "active", "at_risk", "reached", "moved", "discarded"
]

MILESTONE_STATUSES = roadmap_service.ROADMAP_ITEM_STATUSES


def _as_milestone(item: dict[str, Any]) -> dict[str, Any]:
    return {
        "id": item["id"],
        "tenant_id": item["tenant_id"],
        "initiative_id": item["initiative_id"],
        "title": item["title"],
        "goal_description": item.get("goal_description", ""),
        "status": item["status"],
        "target_date": item.get("target_date"),
        "created_at": item["created_at"],
        "updated_at": item["updated_at"],
    }


def create_milestone(
    *,
    tenant_id: str,
    initiative_id: str,
    title: str,
    goal_description: str = "",
    status: MilestoneStatus = "planned",
    target_date: Optional[date] = None,
    user_id: Optional[str] = None,
) -> dict[str, Any]:
    item = roadmap_service.create_roadmap_item(
        tenant_id=tenant_id,
        initiative_id=initiative_id,
        title=title,
        item_type="milestone",
        goal_description=goal_description,
        status=status,
        target_date=target_date,
        user_id=user_id,
    )
    return _as_milestone(item)


def list_milestones_for_initiative(*, tenant_id: str, initiative_id: str) -> list[dict[str, Any]]:
    items = roadmap_service.list_roadmap_items_for_initiative(
        tenant_id=tenant_id, initiative_id=initiative_id
    )
    return [_as_milestone(i) for i in items if i["item_type"] == "milestone"]


def get_milestone(*, tenant_id: str, milestone_id: str) -> Optional[dict[str, Any]]:
    item = roadmap_service.get_roadmap_item(tenant_id=tenant_id, item_id=milestone_id)
    if not item or item["item_type"] != "milestone":
        return None
    return _as_milestone(item)


def update_milestone(
    *,
    tenant_id: str,
    milestone_id: str,
    user_id: Optional[str] = None,
    title: Optional[str] = None,
    goal_description: Optional[str] = None,
    status: Optional[MilestoneStatus] = None,
    target_date: Optional[date] = None,
    clear_target_date: bool = False,
) -> Optional[dict[str, Any]]:
    item = roadmap_service.update_roadmap_item(
        tenant_id=tenant_id,
        item_id=milestone_id,
        user_id=user_id,
        title=title,
        goal_description=goal_description,
        status=status,
        target_date=target_date,
        clear_target_date=clear_target_date,
    )
    return _as_milestone(item) if item else None


def delete_milestone(
    *,
    tenant_id: str,
    milestone_id: str,
    user_id: Optional[str] = None,
) -> bool:
    item = roadmap_service.get_roadmap_item(tenant_id=tenant_id, item_id=milestone_id)
    if not item or item["item_type"] != "milestone":
        return False
    return roadmap_service.delete_roadmap_item(
        tenant_id=tenant_id, item_id=milestone_id, user_id=user_id
    )