import { createFileRoute, Link, useNavigate } from "@tanstack/react-router";
import { useForm } from "@tanstack/react-form";
import { useMutation } from "@tanstack/react-query";
import { toast } from "sonner";
import { ArrowRight } from "lucide-react";
import { usePostHog } from "@posthog/react";

import {
  registerSchema,
  type AuthSession,
  type RegisterInput,
} from "@rubis/shared";

import { api, ApiError } from "@/lib/api";
import { authStore } from "@/lib/auth";
import { Button } from "@rubis/ui";
import { Input } from "@/components/ui/Input";
import { Field } from "@/components/ui/Field";
import { Card } from "@rubis/ui";
import { Eyebrow } from "@rubis/ui";
import { Brand } from "@rubis/ui";
import { Gem } from "@rubis/ui";
import { SsoButton, AuthDivider } from "@/components/auth/SsoButton";

export const Route = createFileRoute("/signup")({
  component: SignupPage,
});

function SignupPage() {
  const navigate = useNavigate();
  const posthog = usePostHog();

  const signupMutation = useMutation({
    mutationFn: async (input: RegisterInput) =>
      api.post<AuthSession>("/api/v1/auth/signup", input, { anonymous: true }),
    onSuccess: (session) => {
      posthog.identify(session.user.id, {
        email: session.user.email,
        name: session.user.fullName,
      });
      posthog.capture("user_signed_up", { email: session.user.email });
      authStore.setSession(session.accessToken, session.user);
      toast.success("Compte créé. On finalise votre installation.");
      void navigate({ to: "/onboarding/compte" });
    },
    onError: (error: unknown) => {
      if (error instanceof ApiError && error.status === 422) {
        const emailErrs = error.fieldErrors?.["email"];
        if (emailErrs?.[0]) {
          toast.error(emailErrs[0]);
          return;
        }
      }
      toast.error("Inscription impossible. Réessayez dans un instant.");
    },
  });

  const form = useForm({
    defaultValues: { fullName: "", email: "", password: "" } satisfies RegisterInput,
    validators: { onChange: registerSchema },
    onSubmit: async ({ value }) => {
      await signupMutation.mutateAsync(value);
    },
  });

  return (
    <main className="min-h-screen bg-cream relative overflow-hidden">
      {/* Glow rubis discret en haut-droite — signature visuelle. */}
      <div
        aria-hidden="true"
        className="pointer-events-none absolute top-[-180px] right-[-220px] size-[680px] rounded-full"
        style={{
          background:
            "radial-gradient(circle, rgba(251,228,234,0.55), transparent 60%)",
        }}
      />

      <div className="relative z-10 mx-auto grid min-h-screen w-full max-w-[1180px] grid-cols-1 gap-16 px-6 py-12 lg:grid-cols-[1.1fr_1fr] lg:items-center lg:px-8">
        {/* Colonne gauche — pitch */}
        <section className="order-2 lg:order-1 max-w-[520px]">
          <div className="flex flex-col gap-4">
            <Link to="/login" className="inline-block">
              <Brand withSuffix />
            </Link>

            <Eyebrow>Bienvenue chez Rubis</Eyebrow>
          </div>
          <h1 className="mt-4 font-display text-[44px] font-bold leading-[1.05] tracking-[-0.025em] text-ink lg:text-[52px]">
            Vos factures relancées <em>toutes seules</em> pendant que vous
            travaillez.
          </h1>
          <p className="mt-5 max-w-md text-[16px] leading-[1.6] text-ink-2">
            Trois minutes pour configurer, et Rubis prend le relais. Pas de
            CRM à apprendre, pas de tableur à entretenir.
          </p>

          <ul className="mt-10 flex flex-col gap-3 text-[14px] text-ink-2">
            <li className="flex items-start gap-2.5">
              <Gem size={11} className="mt-1.5" />
              <span>
                <strong className="font-semibold text-ink">5 h récupérées</strong>{" "}
                par semaine en moyenne — temps réinjecté dans votre vrai métier.
              </span>
            </li>
            <li className="flex items-start gap-2.5">
              <Gem size={11} className="mt-1.5" />
              <span>
                <strong className="font-semibold text-ink">3 clics</strong> pour
                lancer une relance sur une facture neuve.
              </span>
            </li>
            <li className="flex items-start gap-2.5">
              <Gem size={11} className="mt-1.5" />
              <span>
                <strong className="font-semibold text-ink">14 jours offerts</strong>{" "}
                au lancement, sans carte bancaire.
              </span>
            </li>
          </ul>
        </section>

        {/* Colonne droite — formulaire */}
        <section className="order-1 lg:order-2">
          <Card variant="hero" padding="lg" className="mx-auto w-full max-w-[420px]">
            <h2 className="font-display text-2xl font-semibold tracking-[-0.018em] text-ink">
              Créer mon compte
            </h2>
            <p className="mt-1.5 text-[14px] text-ink-3">
              Déjà inscrit ?{" "}
              <Link
                to="/login"
                className="font-medium text-rubis underline-offset-4 hover:underline"
              >
                Connexion
              </Link>
            </p>

            <div className="mt-7 flex flex-col gap-2">
              <SsoButton provider="google" label="S'inscrire avec Google" />
              <SsoButton provider="microsoft" label="S'inscrire avec Microsoft" />
              <AuthDivider />
            </div>

            <form
              noValidate
              onSubmit={(e) => {
                e.preventDefault();
                void form.handleSubmit();
              }}
              className="flex flex-col gap-5"
            >
              <form.Field name="fullName">
                {(field) => (
                  <Field
                    label="Prénom et nom"
                    htmlFor={field.name}
                    error={field.state.meta.errors[0]?.message}
                  >
                    <Input
                      id={field.name}
                      name={field.name}
                      type="text"
                      autoComplete="name"
                      autoFocus
                      placeholder="Camille Dubois"
                      value={field.state.value}
                      onBlur={field.handleBlur}
                      onChange={(e) => field.handleChange(e.target.value)}
                      aria-invalid={field.state.meta.errors.length > 0}
                    />
                  </Field>
                )}
              </form.Field>

              <form.Field name="email">
                {(field) => (
                  <Field
                    label="Email pro"
                    htmlFor={field.name}
                    hint="Servira d'identifiant et d'expéditeur des relances."
                    error={field.state.meta.errors[0]?.message}
                  >
                    <Input
                      id={field.name}
                      name={field.name}
                      type="email"
                      autoComplete="email"
                      placeholder="vous@entreprise.fr"
                      value={field.state.value}
                      onBlur={field.handleBlur}
                      onChange={(e) => field.handleChange(e.target.value)}
                      aria-invalid={field.state.meta.errors.length > 0}
                    />
                  </Field>
                )}
              </form.Field>

              <form.Field name="password">
                {(field) => (
                  <Field
                    label="Mot de passe"
                    htmlFor={field.name}
                    hint="8 caractères minimum."
                    error={field.state.meta.errors[0]?.message}
                  >
                    <Input
                      id={field.name}
                      name={field.name}
                      type="password"
                      autoComplete="new-password"
                      placeholder="••••••••"
                      value={field.state.value}
                      onBlur={field.handleBlur}
                      onChange={(e) => field.handleChange(e.target.value)}
                      aria-invalid={field.state.meta.errors.length > 0}
                    />
                  </Field>
                )}
              </form.Field>

              <Button
                type="submit"
                size="md"
                loading={signupMutation.isPending}
                className="mt-1 w-full"
              >
                Créer mon compte <ArrowRight size={16} aria-hidden="true" />
              </Button>

              <p className="mt-1 text-center text-[11.5px] leading-relaxed text-ink-3">
                En créant un compte, vous acceptez nos{" "}
                <a href="#" className="underline underline-offset-4 hover:text-ink">
                  conditions d&apos;utilisation
                </a>{" "}
                et notre{" "}
                <a href="#" className="underline underline-offset-4 hover:text-ink">
                  politique de confidentialité
                </a>
                .
              </p>
            </form>
          </Card>
        </section>
      </div>
    </main>
  );
}