"""Action (Maßnahme) API — AP0.5 / AP0.7."""

from __future__ import annotations

from datetime import datetime
from typing import Literal, Optional

from capabilities import require_capability
from data_layer import actions as dl_actions
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from services import actions as action_service
from services import tasks as task_service
from tenant_context import TenantContext

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


class ActionUpdateRequest(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=255)
    description: Optional[str] = None
    status: Optional[
        Literal["open", "ready", "in_progress", "blocked", "review_required", "done", "discarded"]
    ] = None
    priority: Optional[Literal["low", "normal", "high"]] = None
    due_at: Optional[str] = None
    clear_due_at: bool = False
    project_id: Optional[str] = None
    clear_project: bool = False


class TaskCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    description: str = ""
    status: Literal["open", "in_progress", "done", "discarded"] = "open"
    roadmap_item_id: Optional[str] = None
    sort_order: int = 0
    due_at: Optional[str] = None


class ActionAssignmentsRequest(BaseModel):
    actor_ids: list[str] = Field(default_factory=list)


@router.get("/me/open")
def list_my_open_actions(
    ctx: TenantContext = Depends(require_capability("kairo.action.read")),
):
    try:
        return dl_actions.get_all_my_open_actions(ctx)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.get("/{action_id}/tasks")
def list_action_tasks(
    action_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.action.read")),
):
    try:
        return task_service.list_tasks_for_action(
            tenant_id=ctx.tenant_id, action_id=action_id
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.post("/{action_id}/tasks", status_code=201)
def create_action_task(
    action_id: str,
    body: TaskCreateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    due_at = None
    if body.due_at:
        try:
            due_at = datetime.fromisoformat(body.due_at.replace("Z", "+00:00"))
        except ValueError as exc:
            raise HTTPException(status_code=400, detail="Ungültiges due_at") from exc
    try:
        return task_service.create_task(
            tenant_id=ctx.tenant_id,
            action_id=action_id,
            user_id=ctx.user_id,
            title=body.title,
            description=body.description,
            status=body.status,
            roadmap_item_id=body.roadmap_item_id,
            sort_order=body.sort_order,
            due_at=due_at,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.get("/{action_id}")
def get_action(
    action_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.action.read")),
):
    item = action_service.get_action(tenant_id=ctx.tenant_id, action_id=action_id)
    if not item:
        raise HTTPException(status_code=404, detail="Maßnahme nicht gefunden")
    return item


@router.patch("/{action_id}")
def update_action(
    action_id: str,
    body: ActionUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    due_at = None
    if body.due_at is not None:
        try:
            due_at = datetime.fromisoformat(body.due_at.replace("Z", "+00:00"))
        except ValueError as exc:
            raise HTTPException(status_code=400, detail="Ungültiges due_at") from exc
    try:
        item = action_service.update_action(
            tenant_id=ctx.tenant_id,
            action_id=action_id,
            user_id=ctx.user_id,
            title=body.title,
            description=body.description,
            status=body.status,
            priority=body.priority,
            due_at=due_at,
            clear_due_at=body.clear_due_at,
            project_id=body.project_id,
            clear_project=body.clear_project,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    if not item:
        raise HTTPException(status_code=404, detail="Maßnahme nicht gefunden")
    return item


@router.put("/{action_id}/assignments")
def set_action_assignments(
    action_id: str,
    body: ActionAssignmentsRequest,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    try:
        item = action_service.set_action_assignments(
            tenant_id=ctx.tenant_id,
            action_id=action_id,
            actor_ids=body.actor_ids,
            user_id=ctx.user_id,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    if not item:
        raise HTTPException(status_code=404, detail="Maßnahme nicht gefunden")
    return item


@router.delete("/{action_id}", status_code=204)
def delete_action(
    action_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.action.manage")),
):
    if not action_service.delete_action(
        tenant_id=ctx.tenant_id,
        action_id=action_id,
        user_id=ctx.user_id,
    ):
        raise HTTPException(status_code=404, detail="Maßnahme nicht gefunden")