// src/components/reset-password-form.tsx
"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import { useState } from "react";
import { PasswordStrength } from "@/components/auth/password-strength";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import {
  Field,
  FieldDescription,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import {
  MIN_PASSWORD_LENGTH,
  validatePassword,
} from "@/lib/auth/password-policy";
import { authClient } from "@/lib/auth-client";
import { cn } from "@/lib/utils";

// Mirrors the server-side policy message in auth.ts (this form is hardcoded FR).
const PASSWORD_TOO_WEAK =
  "Mot de passe trop faible : 14 caractères minimum avec majuscule, minuscule, chiffre et symbole.";

export function ResetPasswordForm({
  token,
  tokenError,
  className,
  ...props
}: React.ComponentProps<"div"> & {
  token?: string;
  tokenError?: string;
}) {
  const router = useRouter();
  const [password, setPassword] = useState("");
  const [confirm, setConfirm] = useState("");
  const [pending, setPending] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [done, setDone] = useState(false);

  // No usable token (missing, invalid or expired) → dead-end with a way back.
  if (!token || tokenError) {
    return (
      <div className={cn("flex flex-col gap-6", className)} {...props}>
        <Card>
          <CardContent className="flex flex-col items-center gap-3 p-6 text-center md:p-8">
            <h1 className="font-bold text-2xl">Lien invalide</h1>
            <p className="text-balance text-muted-foreground">
              Ce lien de réinitialisation est invalide ou a expiré. Demande un
              nouveau lien pour réinitialiser ton mot de passe.
            </p>
            <Link
              href="/forgot-password"
              className="text-sm underline underline-offset-4"
            >
              Demander un nouveau lien
            </Link>
          </CardContent>
        </Card>
      </div>
    );
  }

  async function submit(e: React.FormEvent) {
    e.preventDefault();
    setError(null);
    if (!validatePassword(password).ok) {
      setError(PASSWORD_TOO_WEAK);
      return;
    }
    if (password !== confirm) {
      setError("Les mots de passe ne correspondent pas.");
      return;
    }
    setPending(true);
    const res = await authClient.resetPassword({
      newPassword: password,
      token,
    });
    setPending(false);
    if (res.error) {
      setError(res.error.message ?? "Échec de la réinitialisation.");
    } else {
      setDone(true);
      router.push("/login");
    }
  }

  return (
    <div className={cn("flex flex-col gap-6", className)} {...props}>
      <Card>
        <CardContent className="p-6 md:p-8">
          <form onSubmit={submit}>
            <FieldGroup>
              <div className="flex flex-col items-center gap-2 text-center">
                <h1 className="font-bold text-2xl">Nouveau mot de passe</h1>
                <p className="text-balance text-muted-foreground">
                  Choisis un nouveau mot de passe pour ton compte
                </p>
              </div>
              <Field>
                <FieldLabel htmlFor="password">Mot de passe</FieldLabel>
                <Input
                  id="password"
                  type="password"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  minLength={MIN_PASSWORD_LENGTH}
                  required
                />
                <PasswordStrength password={password} />
              </Field>
              <Field>
                <FieldLabel htmlFor="confirm">
                  Confirme le mot de passe
                </FieldLabel>
                <Input
                  id="confirm"
                  type="password"
                  value={confirm}
                  onChange={(e) => setConfirm(e.target.value)}
                  required
                />
              </Field>
              {error ? (
                <p className="text-destructive text-sm" role="alert">
                  {error}
                </p>
              ) : null}
              {done ? (
                <p className="text-muted-foreground text-sm">
                  Mot de passe réinitialisé — redirection vers la connexion…
                </p>
              ) : null}
              <Field>
                <Button
                  type="submit"
                  disabled={pending || done || !password || !confirm}
                >
                  {pending ? "…" : "Réinitialiser le mot de passe"}
                </Button>
              </Field>
              <FieldDescription className="text-center">
                <Link href="/login">Retour à la connexion</Link>
              </FieldDescription>
            </FieldGroup>
          </form>
        </CardContent>
      </Card>
    </div>
  );
}