"""Work cycle (Sprint/Zeitbox) API — AP2.0f."""

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 work_cycle as work_cycle_service
from tenant_context import TenantContext

initiative_router = APIRouter(
    prefix="/api/initiatives/{initiative_id}/work-cycles",
    tags=["work-cycles"],
)


class WorkCycleCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    goal_description: str = ""
    status: Literal["planned", "active"] = "planned"
    target_date: Optional[date] = None
    sort_order: int = 0


@initiative_router.get("")
def list_work_cycles(
    initiative_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.read")),
):
    return work_cycle_service.list_work_cycles_for_initiative(
        tenant_id=ctx.tenant_id, initiative_id=initiative_id
    )


@initiative_router.get("/active")
def get_active_work_cycle(
    initiative_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.read")),
):
    item = work_cycle_service.get_active_work_cycle(
        tenant_id=ctx.tenant_id, initiative_id=initiative_id
    )
    if not item:
        return None
    item["open_action_count"] = work_cycle_service.count_actions_in_work_cycle(
        tenant_id=ctx.tenant_id,
        initiative_id=initiative_id,
        work_cycle_id=item["id"],
    )
    return item


@initiative_router.post("", status_code=201)
def create_work_cycle(
    initiative_id: str,
    body: WorkCycleCreateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.manage")),
):
    try:
        item = work_cycle_service.create_work_cycle(
            tenant_id=ctx.tenant_id,
            initiative_id=initiative_id,
            title=body.title,
            goal_description=body.goal_description,
            status=body.status,
            target_date=body.target_date,
            sort_order=body.sort_order,
            user_id=ctx.user_id,
        )
        if body.status == "active":
            item = work_cycle_service.activate_work_cycle(
                tenant_id=ctx.tenant_id,
                initiative_id=initiative_id,
                work_cycle_id=item["id"],
                user_id=ctx.user_id,
            )
        return item
    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


@initiative_router.post("/{work_cycle_id}/activate")
def activate_work_cycle(
    initiative_id: str,
    work_cycle_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.milestone.manage")),
):
    try:
        return work_cycle_service.activate_work_cycle(
            tenant_id=ctx.tenant_id,
            initiative_id=initiative_id,
            work_cycle_id=work_cycle_id,
            user_id=ctx.user_id,
        )
    except ValueError as exc:
        detail = str(exc)
        if detail in ("Initiative nicht gefunden", "Zeitbox nicht gefunden"):
            raise HTTPException(status_code=404, detail=detail) from exc
        raise HTTPException(status_code=400, detail=detail) from exc