"use client";

import { useEffect, useState, useRef } from "react";
import { fetchSettingByCode } from "@/api/serversetting";
import { X, Eclipse } from "lucide-react";
import { ChatInputBox } from "@/components/ChatInputBox/ChatInputBox";

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);
  const [isFlying, setIsFlying] = useState<boolean>(false);
  const autoCollapseTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);

  const handleDismiss = () => {
    setIsFlying(true);
  };

  const handleBannerClick = () => {
    if (isFlying) {
      setIsFlying(false);
    }
  };

  // Auto collapse after mount (3s)
  useEffect(() => {
    if (autoCollapseTimerRef.current) return;
    autoCollapseTimerRef.current = setTimeout(() => {
      setIsFlying(true);
    }, 3000);
    return () => {
      if (autoCollapseTimerRef.current) {
        clearTimeout(autoCollapseTimerRef.current);
        autoCollapseTimerRef.current = 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 (
    <div data-alt="home-banner-wrapper" className="relative w-full mx-auto p-0 overflow-hidden">
      {/* Banner overlay - stacked above */}
      <section
        data-alt="home-banner"
        className={`absolute inset-0 z-10 isolate overflow-hidden rounded-3xl px-6 py-6 text-white border-2 border-transparent hover:border-custom-blue/50 transition-all duration-500 ease-in-out ${
          isFlying
            ? "cursor-pointer translate-x-[90%] -translate-y-[70%] scale-[0.85] opacity-95 rotate-3"
            : "translate-x-0 translate-y-0 scale-100 opacity-100 rotate-0"
        }`}
        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 flex-col items-center gap-4 text-center md:items-start md:text-left"
        >
          {/* Dismiss button */}
          <div className="absolute right-0 top-0">
            <button
              data-alt="banner-dismiss"
              type="button"
              onClick={handleDismiss}
              className="text-white hover:bg-white/20 rounded-full p-2"
              aria-label="Dismiss banner"
            >
              <X className="h-5 w-5" />
            </button>
          </div>
          {isFlying ? (
            <button type="button" onClick={handleBannerClick} className="absolute left-[-15px] bottom-[-20px] h-5 w-5">
              <Eclipse className="inset-0 h-5 w-5" />
            </button>
          ) : null}
          {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>

      {/* Base content - always present under the banner */}
      <div data-alt="home-banner-base" className="relative bg-transparent py-6 min-h-[300px]">
        <ChatInputBox noData={false} />
      </div>
    </div>
  );
}