from uuid import uuid4

from fastapi import APIRouter, HTTPException

from app.db import fetch_project_or_404, get_conn, utcnow
from app.models import Project, ProjectCreate, ProjectUpdate

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


@router.post("", response_model=Project, status_code=201)
def create_project(payload: ProjectCreate) -> Project:
    if not payload.name.strip():
        raise HTTPException(status_code=400, detail="name is required")
    now = utcnow()
    record = {
        "id": str(uuid4()),
        "name": payload.name.strip(),
        "external_ref": payload.external_ref,
        "created_at": now,
        "updated_at": now,
    }
    with get_conn() as conn:
        conn.execute(
            "INSERT INTO projects (id, name, external_ref, created_at, updated_at) VALUES (%s, %s, %s, %s, %s)",
            (record["id"], record["name"], record["external_ref"], record["created_at"], record["updated_at"]),
        )
        conn.commit()
    return Project.model_validate(record)


@router.get("", response_model=list[Project])
def list_projects() -> list[Project]:
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT id, name, external_ref, created_at, updated_at FROM projects ORDER BY created_at ASC"
        ).fetchall()
    return [Project.model_validate(row) for row in rows]


@router.get("/{project_id}", response_model=Project)
def get_project(project_id: str) -> Project:
    with get_conn() as conn:
        return Project.model_validate(fetch_project_or_404(conn, project_id))


@router.patch("/{project_id}", response_model=Project)
def update_project(project_id: str, payload: ProjectUpdate) -> Project:
    with get_conn() as conn:
        current = fetch_project_or_404(conn, project_id)
        if payload.name is not None:
            if not payload.name.strip():
                raise HTTPException(status_code=400, detail="name cannot be empty")
            current["name"] = payload.name.strip()
        if payload.external_ref is not None:
            current["external_ref"] = payload.external_ref
        current["updated_at"] = utcnow()
        conn.execute(
            "UPDATE projects SET name = %s, external_ref = %s, updated_at = %s WHERE id = %s",
            (current["name"], current["external_ref"], current["updated_at"], project_id),
        )
        conn.commit()
        return Project.model_validate(current)