"""Project API — AP1.5."""

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 projects as project_service
from tenant_context import TenantContext

initiative_router = APIRouter(prefix="/api/initiatives", tags=["projects"])
items_router = APIRouter(prefix="/api/projects", tags=["projects"])


class ProjectCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    description: str = ""
    status: Literal["active", "paused", "completed", "archived"] = "active"
    roadmap_item_id: Optional[str] = None
    sort_order: int = 0
    target_date: Optional[date] = None


class ProjectUpdateRequest(BaseModel):
    title: Optional[str] = Field(default=None, min_length=1, max_length=255)
    description: Optional[str] = None
    status: Optional[Literal["active", "paused", "completed", "archived"]] = None
    roadmap_item_id: Optional[str] = None
    clear_roadmap_item: bool = False
    sort_order: Optional[int] = None
    target_date: Optional[date] = None
    clear_target_date: bool = False


@initiative_router.get("/{initiative_id}/projects")
def list_initiative_projects(
    initiative_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.project.read")),
):
    try:
        return project_service.list_projects_for_initiative(
            tenant_id=ctx.tenant_id, initiative_id=initiative_id
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@initiative_router.post("/{initiative_id}/projects", status_code=201)
def create_initiative_project(
    initiative_id: str,
    body: ProjectCreateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.project.manage")),
):
    try:
        return project_service.create_project(
            tenant_id=ctx.tenant_id,
            initiative_id=initiative_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,
            target_date=body.target_date,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@items_router.get("/{project_id}")
def get_project(
    project_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.project.read")),
):
    item = project_service.get_project(tenant_id=ctx.tenant_id, project_id=project_id)
    if not item:
        raise HTTPException(status_code=404, detail="Projekt nicht gefunden")
    return item


@items_router.patch("/{project_id}")
def update_project(
    project_id: str,
    body: ProjectUpdateRequest,
    ctx: TenantContext = Depends(require_capability("kairo.project.manage")),
):
    try:
        item = project_service.update_project(
            tenant_id=ctx.tenant_id,
            project_id=project_id,
            user_id=ctx.user_id,
            title=body.title,
            description=body.description,
            status=body.status,
            roadmap_item_id=body.roadmap_item_id,
            clear_roadmap_item=body.clear_roadmap_item,
            sort_order=body.sort_order,
            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="Projekt nicht gefunden")
    return item


@items_router.delete("/{project_id}", status_code=204)
def delete_project(
    project_id: str,
    ctx: TenantContext = Depends(require_capability("kairo.project.manage")),
):
    if not project_service.delete_project(
        tenant_id=ctx.tenant_id, project_id=project_id, user_id=ctx.user_id
    ):
        raise HTTPException(status_code=404, detail="Projekt nicht gefunden")