"use client";

import { useState } from "react";

import { LandingShell } from "@/components/landing/shell";
import type { LandingProps } from "@/components/landing/types";
import { FEEDBACK_SCALES, feedbackDataSchema } from "@/lib/qr/types/feedback";

export function FeedbackLanding({ data, codeId }: LandingProps) {
  const { title, question, scale, allowComment, commentLabel, thankYou } =
    feedbackDataSchema.parse(data);

  const [note, setNote] = useState<number | null>(null);
  const [kommentar, setKommentar] = useState("");
  const [laeuft, setLaeuft] = useState(false);
  const [fertig, setFertig] = useState(false);
  const [fehler, setFehler] = useState<string | null>(null);

  const symbole = FEEDBACK_SCALES[scale].symbols;

  async function absenden() {
    if (note === null) return;
    setLaeuft(true);
    setFehler(null);
    try {
      const response = await fetch("/api/feedback", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ codeId, rating: note, comment: kommentar }),
      });
      if (!response.ok) {
        const body = await response.json().catch(() => null);
        setFehler(body?.error ?? "Die Rückmeldung konnte nicht gesendet werden.");
        return;
      }
      setFertig(true);
    } catch {
      setFehler(
        "Die Rückmeldung konnte nicht gesendet werden. Besteht die Verbindung noch?",
      );
    } finally {
      setLaeuft(false);
    }
  }

  if (fertig) {
    return (
      <LandingShell title={title}>
        <div className="rounded-2xl border border-emerald-200 bg-emerald-50 px-6 py-10 text-center">
          <p className="text-4xl" aria-hidden="true">
            ✓
          </p>
          <p className="mt-3 text-lg font-medium text-emerald-900">
            {thankYou}
          </p>
        </div>
      </LandingShell>
    );
  }

  return (
    <LandingShell title={title}>
      <div className="rounded-2xl border border-slate-200 bg-surface p-5 shadow-sm sm:p-6">
        <fieldset>
          <legend className="text-center text-base font-medium text-slate-900">
            {question}
          </legend>

          <div className="mt-5 flex justify-center gap-1.5 sm:gap-2">
            {symbole.map((symbol, index) => {
              const wert = index + 1;
              const gewaehlt = note !== null && note >= wert;
              return (
                <button
                  key={wert}
                  type="button"
                  aria-label={`${wert} von 5`}
                  aria-pressed={note === wert}
                  disabled={laeuft}
                  onClick={() => setNote(wert)}
                  className={
                    scale === "stars"
                      ? `rounded-lg px-1 text-4xl transition-transform hover:scale-110 sm:text-5xl ${
                          gewaehlt ? "text-amber-400" : "text-slate-200"
                        }`
                      : `rounded-lg px-1 text-3xl transition-transform hover:scale-110 sm:text-4xl ${
                          note === wert
                            ? "scale-110"
                            : "opacity-40 grayscale"
                        }`
                  }
                >
                  {symbol}
                </button>
              );
            })}
          </div>

          {note !== null ? (
            <p className="mt-2 text-center text-sm text-slate-500">
              {note} von 5
            </p>
          ) : null}
        </fieldset>

        {allowComment ? (
          <div className="mt-6">
            <label
              htmlFor="feedback-comment"
              className="mb-1.5 block text-sm font-medium text-slate-700"
            >
              {commentLabel}
            </label>
            <textarea
              id="feedback-comment"
              rows={3}
              maxLength={1000}
              value={kommentar}
              disabled={laeuft}
              onChange={(event) => setKommentar(event.target.value)}
              className="w-full rounded-lg border border-slate-300 bg-surface px-3 py-2.5 text-sm text-slate-900 shadow-sm placeholder:text-slate-400"
              placeholder="Optional"
            />
          </div>
        ) : null}

        {fehler ? (
          <p role="alert" className="mt-4 text-sm text-red-600">
            {fehler}
          </p>
        ) : null}

        <button
          type="button"
          disabled={note === null || laeuft}
          onClick={() => void absenden()}
          className="mt-6 w-full rounded-lg bg-indigo-600 px-4 py-3 font-medium text-white transition-colors hover:bg-indigo-700 disabled:cursor-not-allowed disabled:bg-slate-300"
        >
          {laeuft ? "Wird gesendet …" : "Absenden"}
        </button>

        <p className="mt-3 text-center text-xs text-slate-400">
          Deine Rückmeldung wird ohne Namen und ohne IP-Adresse gespeichert.
        </p>
      </div>
    </LandingShell>
  );
}