import { useEffect, useState } from "react";
import { Mail, ArrowRight, X } from "lucide-react";

import { api } from "@/lib/api";
import { cn } from "@/lib/utils";
import type { DemoCapturedEmail, FiredEvent } from "@/lib/demo";
import { Button } from "@/components/ui/Button";

/**
 * Slide-over droite affichant l'email qui vient d'être déclenché.
 * Tant que l'utilisateur n'a pas cliqué "Continuer la démo", l'horloge
 * reste en pause — c'est l'effet "le temps s'est arrêté pour montrer".
 */
const FR_DATETIME = new Intl.DateTimeFormat("fr-FR", {
  weekday: "long",
  day: "numeric",
  month: "long",
  hour: "2-digit",
  minute: "2-digit",
});

export function DemoEmailSlide({
  event,
  remaining,
  virtualNow,
  onContinue,
}: {
  event: FiredEvent;
  remaining: number;
  virtualNow: Date;
  onContinue: () => void;
}) {
  const [email, setEmail] = useState<DemoCapturedEmail | null>(null);

  useEffect(() => {
    if (!event.capturedEmailId) {
      setEmail(null);
      return;
    }
    let cancelled = false;
    void api
      .get<DemoCapturedEmail[]>("/api/v1/demo/inbox")
      .then((list) => {
        if (cancelled) return;
        const found = list.find((e) => e.id === event.capturedEmailId);
        setEmail(found ?? null);
      })
      .catch(() => setEmail(null));
    return () => {
      cancelled = true;
    };
  }, [event.capturedEmailId]);

  // Petit slide-in subtil — pas une animation tape-à-l'œil, on tient la DA.
  return (
    <>
      {/* Backdrop discret — on ne ferme pas au clic dehors (volontaire :
          l'utilisateur DOIT acquitter pour reprendre la démo). */}
      <div
        aria-hidden="true"
        className="fixed inset-0 z-40 bg-ink/10 backdrop-blur-[2px]"
      />

      <aside
        role="dialog"
        aria-label="Email reçu pendant la démo"
        className={cn(
          "fixed top-0 right-0 z-50 h-screen w-full max-w-[520px]",
          "bg-cream border-l border-line shadow-card",
          "flex flex-col",
          "animate-in slide-in-from-right duration-200",
        )}
      >
        {/* Header */}
        <div className="flex items-center gap-3 border-b border-line bg-white px-5 py-4">
          <span
            className={cn(
              "shrink-0 size-9 flex items-center justify-center rounded-full",
              event.kind === "relance" ? "bg-rubis text-white" : "bg-rubis-glow text-rubis-deep",
            )}
          >
            <Mail size={15} />
          </span>
          <div className="flex-1 min-w-0">
            <p className="font-display text-[14.5px] font-bold text-ink leading-tight">
              {event.kind === "relance" ? "Relance envoyée" : "Check-in envoyé"}
            </p>
            <p className="text-[11.5px] text-ink-3 capitalize">
              {FR_DATETIME.format(virtualNow)} · facture {event.invoiceNumero}
            </p>
          </div>
        </div>

        {/* Email rendu façon vrai client mail */}
        <div className="flex-1 overflow-y-auto px-5 py-5">
          {email ? (
            <article className="rounded-card border border-line bg-white shadow-soft overflow-hidden">
              <div className="border-b border-line bg-cream-2/50 px-5 py-3 space-y-1">
                <p className="text-[11.5px] text-ink-3">
                  <span className="font-semibold text-ink-2">De :</span>{" "}
                  {email.from.name} &lt;{email.from.email}&gt;
                </p>
                <p className="text-[11.5px] text-ink-3">
                  <span className="font-semibold text-ink-2">À :</span>{" "}
                  {email.to.name ? `${email.to.name} — ` : ""}
                  {email.to.email}
                </p>
                {email.replyTo && (
                  <p className="text-[11.5px] text-ink-3">
                    <span className="font-semibold text-ink-2">Reply-To :</span>{" "}
                    {email.replyTo}
                  </p>
                )}
                <p className="font-display text-[15px] font-bold text-ink mt-1.5 leading-tight">
                  {email.subject}
                </p>
              </div>
              <div className="px-5 py-4">
                <pre className="whitespace-pre-wrap font-sans text-[13.5px] leading-relaxed text-ink-2">
                  {email.body}
                </pre>
              </div>
            </article>
          ) : (
            <p className="text-[13px] italic text-ink-3 text-center py-8">
              Chargement de l'email…
            </p>
          )}
        </div>

        {/* Footer */}
        <div className="border-t border-line bg-white px-5 py-4 flex items-center justify-between">
          <p className="text-[11.5px] text-ink-3 italic">
            {remaining > 0
              ? `${remaining} autre${remaining > 1 ? "s" : ""} email${remaining > 1 ? "s" : ""} à voir`
              : "Cliquez pour reprendre la démo"}
          </p>
          <Button size="sm" onClick={onContinue}>
            Continuer <ArrowRight size={14} />
          </Button>
        </div>

        <button
          type="button"
          onClick={onContinue}
          className="absolute top-3 right-3 size-7 flex items-center justify-center rounded-full text-ink-3 hover:bg-cream-2"
          aria-label="Fermer"
        >
          <X size={14} />
        </button>
      </aside>
    </>
  );
}