from __future__ import annotations

from typing import Literal
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
from sqlalchemy.orm import Session

from app.db.session import get_db
from app.schemas import Envelope
from app.schemas.project import ProjectCreate, ProjectDeleteResult, ProjectList, ProjectRead, ProjectUpdate
from app.services.project_service import ProjectService
from app.utils.response import envelope

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


@router.get("", response_model=Envelope[ProjectList])
def list_projects(
    request: Request,
    limit: int = Query(default=50, ge=1, le=200),
    offset: int = Query(default=0, ge=0),
    name: str | None = Query(default=None, min_length=1, max_length=255),
    project_status: Literal["active", "archived", "all"] = Query(default="active", alias="status"),
    db: Session = Depends(get_db),
):
    principal = getattr(request.state, "auth_principal", None)
    if principal is not None and principal.role == "guest":
        project = ProjectService.get_project(db, principal.project_id)
        status_matches = bool(
            project is not None
            and (project_status == "all" or project.status == project_status)
        )
        name_matches = bool(
            project is not None
            and (name is None or name.casefold() in project.name.casefold())
        )
        matches = project is not None and status_matches and name_matches
        visible = [project] if matches and offset == 0 else []
        return envelope(
            {
                "items": [ProjectRead.model_validate(item).model_dump() for item in visible[:limit]],
                "total": 1 if matches else 0,
                "limit": limit,
                "offset": offset,
            }
        )
    projects, total = ProjectService.list_projects(
        db,
        limit=limit,
        offset=offset,
        name=name,
        project_status=project_status,
    )
    return envelope({"items": [ProjectRead.model_validate(item).model_dump() for item in projects], "total": total, "limit": limit, "offset": offset})


@router.post("", status_code=status.HTTP_201_CREATED, response_model=Envelope[ProjectRead])
def create_project(payload: ProjectCreate, db: Session = Depends(get_db)):
    project = ProjectService.create_project(db, payload)
    return envelope(ProjectRead.model_validate(project).model_dump())


@router.get("/{project_id}", response_model=Envelope[ProjectRead])
def get_project(project_id: UUID, db: Session = Depends(get_db)):
    project = ProjectService.get_project(db, project_id)
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")
    return envelope(ProjectRead.model_validate(project).model_dump())


@router.patch("/{project_id}", response_model=Envelope[ProjectRead])
def update_project(project_id: UUID, payload: ProjectUpdate, db: Session = Depends(get_db)):
    project = ProjectService.update_project(db, project_id, payload)
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")
    return envelope(ProjectRead.model_validate(project).model_dump())


@router.delete(
    "/{project_id}",
    status_code=status.HTTP_200_OK,
    response_model=Envelope[ProjectDeleteResult],
)
def delete_project(project_id: UUID, db: Session = Depends(get_db)):
    if not ProjectService.delete_project(db, project_id):
        raise HTTPException(status_code=404, detail="Project not found")
    return envelope({"deleted": True})