"use client";

import { useEffect, useState } from "react";
import { fetchSettingByCode } from "@/api/serversetting";

export const HOME_BANNER_CODE = "homeBanner";

/** CTA config for banner */
export interface HomeBannerCTAConfig {
  label?: string;
  href?: string;
  [key: string]: unknown;
}

/** Configuration payload for `HomeBanner` */
export interface HomeBannerConfig {
  eyebrow?: string;
  title?: string;
  subtitle?: string;
  description?: string;
  backgroundImage?: string;
  cta?: HomeBannerCTAConfig;
  ctaText?: string;
  ctaLink?: string;
  [key: string]: unknown;
}

/**
 * Renders the home banner with optional background image and CTA.
 * Pulls configuration from server settings keyed by `HOME_BANNER_CODE`.
 * @returns React.ReactElement | null
 */
export default function HomeBanner() {
  const [config, setConfig] = useState<HomeBannerConfig | null>(null);
  const [loading, setLoading] = useState<boolean>(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    let active = true;

    async function load() {
      setLoading(true);
      setError(null);
      try {
        const value = await fetchSettingByCode<HomeBannerConfig>(HOME_BANNER_CODE);
        if (!active) return;
        setConfig(value ?? null);
      } catch (err) {
        if (!active) return;
        const message = err instanceof Error ? err.message : "Failed to load home banner";
        setError(message);
        setConfig(null);
      } finally {
        if (active) {
          setLoading(false);
        }
      }
    }

    load();

    return () => {
      active = false;
    };
  }, []);

  if (loading || error || !config) {
    // Render nothing until configuration schema is finalized.
    return null;
  }

  const title = typeof config.title === "string" ? config.title : undefined;
  const subtitle = typeof config.subtitle === "string" ? config.subtitle : undefined;
  const description = typeof config.description === "string" ? config.description : undefined;
  const eyebrow = typeof config.eyebrow === "string" ? config.eyebrow : undefined;
  const backgroundImage = typeof config.backgroundImage === "string" ? config.backgroundImage : undefined;

  let ctaLabel: string | undefined;
  let ctaHref: string | undefined;

  if (config.cta && typeof config.cta === "object") {
    const { label, href } = config.cta as Record<string, unknown>;
    if (typeof label === "string") ctaLabel = label;
    if (typeof href === "string") ctaHref = href;
  }

  // Support legacy field names until the API contract is confirmed.
  if (!ctaLabel && typeof config.ctaText === "string") {
    ctaLabel = config.ctaText;
  }
  if (!ctaHref && typeof config.ctaLink === "string") {
    ctaHref = config.ctaLink;
  }

  const hasContent = Boolean(title || subtitle || description || ctaLabel || backgroundImage);
  if (!hasContent) {
    return null;
  }

  return (
    <section
      data-alt="home-banner"
      className="relative isolate overflow-hidden rounded-3xl px-6 py-16 text-white border-2 border-transparent hover:border-custom-blue/50 transition-all duration-300"
      aria-label="Home banner"
    >
      {backgroundImage ? (
        <img
          data-alt="background-image"
          src={backgroundImage}
          className="absolute inset-0 h-full w-full object-cover"
        />
      ) : null}
      {backgroundImage ? (
        <div data-alt="background-overlay" className="absolute inset-0 bg-black/40" />
      ) : null}

      <div
        data-alt="banner-content"
        className="relative flex max-w-4xl flex-col items-center gap-4 text-center md:items-start md:text-left"
      >
        {eyebrow ? (
          <span data-alt="banner-eyebrow" className="text-xs font-semibold uppercase tracking-[0.3em] text-white/70">
            {eyebrow}
          </span>
        ) : null}
        {title ? (
          <h1 data-alt="banner-title" className="text-3xl font-semibold leading-tight md:text-5xl">
            {title}
          </h1>
        ) : null}
        {subtitle ? (
          <p data-alt="banner-subtitle" className="text-lg text-white/80 md:text-xl">{subtitle}</p>
        ) : null}
        {description ? (
          <p data-alt="banner-description" className="max-w-2xl text-base text-white/70">{description}</p>
        ) : null}
        {ctaLabel ? (
          ctaHref ? (
            <a
              data-alt="cta-link"
              href={ctaHref}
              className="inline-flex items-center justify-center rounded-full border border-white/30 bg-white/10 px-6 py-2 text-sm font-medium text-white transition hover:border-white hover:bg-white hover:text-slate-900"
            >
              {ctaLabel}
            </a>
          ) : (
            <button
              data-alt="cta-button"
              type="button"
              className="inline-flex items-center justify-center rounded-full border border-white/30 bg-white/10 px-6 py-2 text-sm font-medium text-white transition hover:border-white hover:bg-white hover:text-slate-900"
            >
              {ctaLabel}
            </button>
          )
        ) : null}
      </div>
    </section>
  );
}