"use client";

import { useState } from "react";
import { useMutation, useQueryClient } from "@tanstack/react-query";
import { AlertTriangle, Loader2, Trash2 } from "lucide-react";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
  AlertDialogTrigger,
} from "@/components/ui/alert-dialog";
import { Button } from "@/components/ui/button";
import { SettingsCardActions } from "@/components/settings/_card-actions";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { SettingsCard } from "@/components/settings/settings-card";
import { SettingsCardHeader } from "@/components/settings/_card-header";
import { useTranslations } from "@/lib/i18n/context";
import { apiDelete } from "@/lib/api/api-fetch";
import { randomId } from "@/lib/random-id";
import {
  recentProofErrorMessage,
  useRecentProof,
} from "@/components/settings/security-section/use-recent-proof";

/**
 * The literal an admin must type to arm the wipe. Mirrors the Backups
 * `RESTORE` gate — and matches the server's typed-token defence at
 * `src/app/api/admin/data/route.ts` (which 422s any other `confirm`).
 */
const WIPE_CONFIRM_TOKEN = "DELETE ALL";

export function DangerZoneSection() {
  const { t } = useTranslations();
  const queryClient = useQueryClient();
  const [wipeMsg, setWipeMsg] = useState<string | null>(null);
  // Typed-confirmation gate. The destructive button stays disabled until
  // the admin types `DELETE ALL` verbatim, matching the Backups Restore
  // dialog (which forces typing `RESTORE`) so the FAR more destructive
  // global wipe is not the weaker gate. Reset whenever the dialog closes.
  const [open, setOpen] = useState(false);
  const [typed, setTyped] = useState("");
  const matched = typed.trim() === WIPE_CONFIRM_TOKEN;

  // Wiping every account asks for a fresh proof unless this session signed
  // in or re-proved within five minutes.
  const recentProof = useRecentProof();

  const wipeAllData = useMutation({
    mutationFn: async () => {
      // Idempotency-Key prevents a double-submit from re-running the
      // destructive transaction, matching the Backups restore path.
      const idempotencyKey = `admin-data-wipe-${randomId()}`;
      // The server returns one count per table that actually held rows. It
      // used to return nine fixed names, which is how nobody noticed the
      // wipe had stopped covering the schema: the result line read the same
      // whether it had cleared nine tables or ninety.
      return recentProof.run(() =>
        apiDelete<{
          cleared: boolean;
          deletedRows: number;
          models: Record<string, number>;
        }>(
          "/api/admin/data",
          { confirm: WIPE_CONFIRM_TOKEN },
          { headers: { "Idempotency-Key": idempotencyKey } },
        ),
      );
    },
    onSuccess: (data) => {
      queryClient.invalidateQueries();
      setWipeMsg(
        t("admin.deletedResult", {
          rows: data.deletedRows,
          tables: Object.keys(data.models).length,
        }),
      );
    },
    onError: (err: Error) => {
      setWipeMsg(recentProofErrorMessage(err, err.message));
    },
  });

  return (
    // v1.18.10 — the card SURFACE is neutral like every other admin /
    // settings section (`SettingsCard`: bg-card + border-border): a red card
    // edge reads as alarming, not premium. The danger signal lives ONLY in
    // the destructive delete button + its typed-confirmation dialog, which
    // are alarm enough. The header keeps the `AlertTriangle` icon so the
    // section still flags its intent.
    <SettingsCard>
      {recentProof.dialog}
      <SettingsCardHeader
        icon={AlertTriangle}
        title={t("admin.deleteAllData")}
        description={t("admin.deleteAllDescription")}
      />
      <p className="text-sm">{t("admin.deleteAllDetail")}</p>

      {wipeMsg && (
        <p
          className={`mt-3 text-sm ${
            wipeAllData.isError ? "text-destructive" : "text-success"
          }`}
        >
          {wipeMsg}
        </p>
      )}
      <SettingsCardActions>
        <AlertDialog
          open={open}
          onOpenChange={(next) => {
            setOpen(next);
            if (!next) setTyped("");
          }}
        >
          <AlertDialogTrigger asChild>
            <Button
              variant="destructive"
              size="sm"
              disabled={wipeAllData.isPending}
              className="min-h-11"
            >
              {wipeAllData.isPending ? (
                <Loader2 className="h-3.5 w-3.5 animate-spin motion-reduce:animate-none" />
              ) : (
                <Trash2 className="h-3.5 w-3.5" />
              )}
              {t("admin.deleteButton")}
            </Button>
          </AlertDialogTrigger>
          <AlertDialogContent>
            <AlertDialogHeader>
              <AlertDialogTitle>{t("admin.deleteAllConfirm")}</AlertDialogTitle>
              <AlertDialogDescription>
                {t("admin.deleteAllConfirmDescription")}
              </AlertDialogDescription>
            </AlertDialogHeader>
            <div className="space-y-2">
              <Label htmlFor="wipe-confirm-prompt">
                {t("admin.deleteAllPromptLabel", {
                  token: WIPE_CONFIRM_TOKEN,
                })}
              </Label>
              <Input
                id="wipe-confirm-prompt"
                value={typed}
                onChange={(e) => setTyped(e.target.value)}
                autoComplete="off"
                spellCheck={false}
                placeholder={WIPE_CONFIRM_TOKEN}
              />
            </div>
            <AlertDialogFooter>
              <AlertDialogCancel>{t("common.cancel")}</AlertDialogCancel>
              <AlertDialogAction
                variant="destructive"
                disabled={!matched || wipeAllData.isPending}
                aria-busy={wipeAllData.isPending || undefined}
                onClick={(e) => {
                  if (!matched) {
                    e.preventDefault();
                    return;
                  }
                  setOpen(false);
                  setTyped("");
                  wipeAllData.mutate();
                }}
              >
                {wipeAllData.isPending && (
                  <Loader2 className="mr-1 h-3.5 w-3.5 animate-spin motion-reduce:animate-none" />
                )}
                {t("admin.finalDelete")}
              </AlertDialogAction>
            </AlertDialogFooter>
          </AlertDialogContent>
        </AlertDialog>
      </SettingsCardActions>
    </SettingsCard>
  );
}