import { useEffect, useState } from "react";
import { Star } from "lucide-react";
import { Link, useSearchParams } from "react-router-dom";
import { HeaderMobile } from "../components/HeaderMobile";
import { LegalFooterLinks } from "../components/marketing/LegalFooterLinks";
import { MobileShell } from "../components/MobileShell";
import { DynamicFeedbackForm } from "../components/DynamicFeedbackForm";
import { useEventRegistrationSettings } from "../hooks/useEventRegistrationSettings";
import { getVisitorFeedbackFormSchema, getVisitorLoginPreview, type VisitorPublicFeedbackForm } from "../lib/api";
import { readStoredVisitorContext } from "../types/visitorContext";

function StarRow({
  label,
  value,
  onChange,
}: {
  label: string;
  value: number;
  onChange: (n: number) => void;
}) {
  return (
    <div className="flex w-full flex-col gap-3">
      <p className="font-inter text-base font-semibold text-[#24282f]">{label}</p>
      <div className="flex gap-4">
        {Array.from({ length: 5 }, (_, i) => (
          <button
            key={i}
            type="button"
            onClick={() => onChange(i + 1)}
            className="text-[#ef8d1d]"
            aria-label={`${i + 1} stars`}
          >
            <Star
              className={`size-6 ${i < value ? "fill-[#ef8d1d]" : "fill-transparent"}`}
              strokeWidth={1.75}
            />
          </button>
        ))}
      </div>
    </div>
  );
}

export function RatingsPage() {
  const [searchParams] = useSearchParams();
  const formId = searchParams.get("form_id")?.trim() || "";
  const urlEventId = searchParams.get("event_id")?.trim() || "";
  const ctx = readStoredVisitorContext();
  const eventId = urlEventId || ctx?.eventId || "";

  const [eventSnapshot, setEventSnapshot] = useState(
    ctx?.eventId === eventId && ctx.event ? ctx.event : null,
  );
  const [schema, setSchema] = useState<VisitorPublicFeedbackForm | null>(null);
  const [schemaLoading, setSchemaLoading] = useState(false);
  const [schemaErr, setSchemaErr] = useState<string | null>(null);

  const [a, setA] = useState(0);
  const [b, setB] = useState(0);
  const [c, setC] = useState(0);

  useEffect(() => {
    if (!eventId) {
      setEventSnapshot(null);
      return;
    }
    if (ctx?.eventId === eventId && ctx.event) {
      setEventSnapshot(ctx.event);
      return;
    }
    let cancelled = false;
    getVisitorLoginPreview(eventId)
      .then((ev) => {
        if (!cancelled) setEventSnapshot(ev);
      })
      .catch(() => {
        if (!cancelled) setEventSnapshot(null);
      });
    return () => {
      cancelled = true;
    };
  }, [eventId, ctx?.eventId, ctx?.event]);

  useEffect(() => {
    if (!formId || !eventId) {
      setSchema(null);
      setSchemaErr(null);
      setSchemaLoading(false);
      return;
    }
    let cancelled = false;
    setSchemaLoading(true);
    setSchemaErr(null);
    getVisitorFeedbackFormSchema(eventId, formId)
      .then((s) => {
        if (!cancelled) setSchema(s);
      })
      .catch((e) => {
        if (!cancelled) {
          setSchema(null);
          setSchemaErr(e instanceof Error ? e.message : "Could not load form.");
        }
      })
      .finally(() => {
        if (!cancelled) setSchemaLoading(false);
      });
    return () => {
      cancelled = true;
    };
  }, [formId, eventId]);

  const reg = useEventRegistrationSettings(eventSnapshot);

  if (!eventId) {
    return (
      <MobileShell className="relative">
        <HeaderMobile logoUrl={ctx?.event?.logoUrl} eventId={null} />
        <main className="flex flex-1 flex-col bg-[#f2f2f7] px-4 pb-10 pt-6">
          <div className="mx-auto w-full max-w-[370px]">
            <h1 className="font-inter text-xl font-semibold text-[#24282f]">Ratings</h1>
            <p className="mt-3 text-sm text-[rgba(36,40,47,0.67)]">Open ratings from your event or session link.</p>
            <Link to="/" className="mt-4 inline-block text-sm font-semibold text-[#1e72ef] underline">
              Home
            </Link>
          </div>
        </main>
      </MobileShell>
    );
  }

  if (!reg.enableRatings) {
    return (
      <MobileShell className="relative">
        <HeaderMobile logoUrl={eventSnapshot?.logoUrl} eventId={eventId || null} />
        <main className="flex flex-1 flex-col bg-[#f2f2f7] px-4 pb-10 pt-6">
          <div className="mx-auto w-full max-w-[370px]">
            <h1 className="font-inter text-xl font-semibold text-[#24282f]">Ratings</h1>
            <p className="mt-3 text-sm text-[rgba(36,40,47,0.67)]">Ratings are disabled for this event.</p>
            <Link to="/event" className="mt-4 inline-block text-sm font-semibold text-[#1e72ef] underline">
              Back to event
            </Link>
          </div>
        </main>
      </MobileShell>
    );
  }

  if (formId) {
    return (
      <MobileShell className="relative">
        <HeaderMobile logoUrl={eventSnapshot?.logoUrl} eventId={eventId || null} />
        <main className="flex flex-1 flex-col bg-[#f2f2f7] px-4 pb-10 pt-6">
          <div className="mx-auto w-full max-w-[370px]">
            <h1 className="font-inter text-xl font-semibold text-[#24282f]">{schema?.name || "Ratings"}</h1>
            {schemaLoading ? (
              <p className="mt-4 text-sm text-[rgba(36,40,47,0.67)]">Loading form…</p>
            ) : schemaErr ? (
              <div className="mt-4">
                <p className="text-sm text-red-600">{schemaErr}</p>
                <Link to="/event" className="mt-4 inline-block text-sm font-semibold text-[#1e72ef] underline">
                  Back to event
                </Link>
              </div>
            ) : schema ? (
              <div className="mt-6">
                <DynamicFeedbackForm eventId={eventId} schema={schema} variant="light" />
              </div>
            ) : null}
          </div>
        </main>
      </MobileShell>
    );
  }

  return (
    <MobileShell className="relative">
      <HeaderMobile logoUrl={eventSnapshot?.logoUrl} eventId={eventId || null} />
      <div className="eb-gradient-auth flex flex-1 flex-col pb-10 pt-4">
        <h1 className="text-center font-inter text-xl font-semibold text-white">Event Ratings</h1>
        <div className="mx-auto mt-6 w-full max-w-[354px] flex-1 px-4">
          <div className="rounded-xl bg-white p-6 shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]">
            <h2 className="text-center font-inter text-base font-semibold text-[#24282f]">Your Rating</h2>
            <p className="mt-3 text-center text-base leading-[22px] text-[rgba(36,40,47,0.67)]">
              We&apos;d love to hear your thoughts about this event. Your rating helps us improve future
              events.
            </p>
            <div className="mt-6 flex flex-col gap-6">
              <StarRow label="How will you rate the speakers?" value={a} onChange={setA} />
              <StarRow label="How will you rate the quality of content?" value={b} onChange={setB} />
              <StarRow
                label="Probability to recommend to your friends and colleagues"
                value={c}
                onChange={setC}
              />
            </div>
            <button
              type="button"
              className="mt-6 w-full rounded-full border border-[rgba(214,200,200,0.6)] bg-[#ef8d1d] py-3 text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)]"
            >
              Submit Ratings
            </button>
            <div className="mt-4 text-center">
              <Link to="/event" className="font-inter font-semibold text-[#1e72ef] underline">
                Cancel
              </Link>
            </div>
          </div>
        </div>
        <footer className="mx-auto mt-6 text-sm font-light">
          <LegalFooterLinks variant="light" />
        </footer>
      </div>
    </MobileShell>
  );
}