"""Panou admin web /admin. US-011 PRD 3.3b.

Rute:
  GET  /admin              — listeaza conturi in asteptare + active (require_admin)
  POST /admin/activate     — activeaza un cont (require_admin + CSRF, PRG)
  POST /admin/deactivate   — dezactiveaza un cont, nu permite id=1 (require_admin + CSRF, PRG)
"""

from __future__ import annotations

from pathlib import Path

from fastapi import APIRouter, Form, Request
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates

from .. import __version__
from ..accounts import list_accounts, set_active
from ..config import get_settings
from ..db import get_connection
from ..web.csrf import get_csrf_token, verify_csrf
from ..web.session import require_admin

router = APIRouter()
_TMPL = Jinja2Templates(directory=str(Path(__file__).resolve().parent / "templates"))


def _ctx(request: Request, **extra) -> dict:
    settings = get_settings()
    return {"rar_env": settings.rar_env, "version": __version__, **extra}


def _emails_by_account(conn) -> dict[int, str | None]:
    """Intoarce primul email per account_id, intr-un singur query (fara N+1)."""
    rows = conn.execute(
        "SELECT account_id, email FROM users ORDER BY id"
    ).fetchall()
    result: dict[int, str | None] = {}
    for row in rows:
        acc_id = int(row["account_id"])
        if acc_id not in result:
            result[acc_id] = row["email"]
    return result


def _render_admin(request: Request, conn, *, error: str | None = None, status_code: int = 200):
    """Randeaza pagina admin.html cu lista de conturi si optional un mesaj de eroare."""
    accounts = list_accounts(conn)
    emails = _emails_by_account(conn)
    for acct in accounts:
        acct["email"] = emails.get(acct["id"])
    pending = [a for a in accounts if not a["active"] and a["id"] != 1]
    active = [a for a in accounts if a["active"] and a["id"] != 1]
    default = next((a for a in accounts if a["id"] == 1), None)
    return _TMPL.TemplateResponse(request, "admin.html", _ctx(
        request,
        csrf_token=get_csrf_token(request),
        pending=pending,
        active=active,
        default_account=default,
        error=error,
    ), status_code=status_code)


@router.get("/admin", response_class=HTMLResponse)
async def admin_get(request: Request):
    """Panou admin: conturi in asteptare + active."""
    require_admin(request)

    conn = get_connection()
    try:
        return _render_admin(request, conn)
    finally:
        conn.close()


@router.post("/admin/activate", response_class=HTMLResponse)
async def admin_activate(
    request: Request,
    account_id: int = Form(...),
    csrf_token: str = Form(default=""),
):
    """Activeaza un cont. PRG: redirect 303 la /admin dupa succes."""
    require_admin(request)
    verify_csrf(request, csrf_token)

    conn = get_connection()
    try:
        try:
            set_active(conn, account_id, True)
        except ValueError as exc:
            return _render_admin(request, conn, error=str(exc), status_code=422)
    finally:
        conn.close()

    return RedirectResponse("/admin", status_code=303)


@router.post("/admin/deactivate", response_class=HTMLResponse)
async def admin_deactivate(
    request: Request,
    account_id: int = Form(...),
    csrf_token: str = Form(default=""),
):
    """Dezactiveaza un cont. Nu permite dezactivarea contului default id=1. PRG: redirect 303."""
    require_admin(request)
    verify_csrf(request, csrf_token)

    if account_id == 1:
        conn = get_connection()
        try:
            return _render_admin(
                request, conn,
                error="Contul default (id=1) nu poate fi dezactivat.",
                status_code=422,
            )
        finally:
            conn.close()

    conn = get_connection()
    try:
        try:
            set_active(conn, account_id, False)
        except ValueError as exc:
            return _render_admin(request, conn, error=str(exc), status_code=422)
    finally:
        conn.close()

    return RedirectResponse("/admin", status_code=303)