"use client";

import { useEffect, useRef, useState } from "react";
import { useTranslations } from "next-intl";
import type { FirmwareInfo } from "@/lib/firmware";
import { boardPreviewSize } from "@/lib/boards";
import { sensorMediaForProject } from "@/lib/sensor-media";
import { cn } from "@/lib/utils";

type Tab = "ui" | "sensor";

/** On-device HTML UI mock + optional hardware still, switchable via tabs. */
export function FirmwarePreview({
  fw,
  className,
  title,
}: {
  fw: FirmwareInfo;
  className?: string;
  title?: string;
}) {
  const t = useTranslations("firmware");
  const hostRef = useRef<HTMLDivElement>(null);
  const [scale, setScale] = useState(1);
  const { w: screenW, h: screenH } = boardPreviewSize(fw.boardId);
  const sensor = sensorMediaForProject(fw.project);
  const hasUi = Boolean(fw.media.preview);
  const [tab, setTab] = useState<Tab>(hasUi ? "ui" : "sensor");

  useEffect(() => {
    setTab(hasUi ? "ui" : sensor ? "sensor" : "ui");
  }, [fw.id, hasUi, sensor]);

  useEffect(() => {
    const el = hostRef.current;
    if (!el || tab !== "ui") return;

    const update = () => {
      const { width, height } = el.getBoundingClientRect();
      if (width <= 0 || height <= 0) return;
      setScale(Math.min(width / screenW, height / screenH));
    };

    update();
    const ro = new ResizeObserver(update);
    ro.observe(el);
    return () => ro.disconnect();
  }, [fw.media.preview, tab, screenW, screenH]);

  const showTabs = hasUi && Boolean(sensor);

  const initials = fw.name
    .replace(/[^A-Za-z0-9\u4e00-\u9fff]+/g, " ")
    .trim()
    .split(/\s+/)
    .slice(0, 2)
    .map((w) => w[0]?.toUpperCase() ?? "")
    .join("");

  return (
    <div
      className={cn(
        "relative flex h-full w-full flex-col overflow-hidden bg-[#0A1016]",
        className
      )}
    >
      {showTabs && (
        <div
          className="absolute left-2 top-2 z-10 flex gap-0.5 rounded-md bg-black/60 p-0.5 backdrop-blur-sm"
          onClick={(e) => e.stopPropagation()}
          onPointerDown={(e) => e.stopPropagation()}
        >
          <button
            type="button"
            className={cn(
              "rounded px-2 py-0.5 text-[0.65rem] font-semibold tracking-wide transition-colors",
              tab === "ui"
                ? "bg-[var(--accent)] text-black"
                : "text-[var(--ink)]/80 hover:text-[var(--ink)]"
            )}
            onClick={(e) => {
              e.stopPropagation();
              setTab("ui");
            }}
          >
            {t("tabUi")}
          </button>
          <button
            type="button"
            className={cn(
              "rounded px-2 py-0.5 text-[0.65rem] font-semibold tracking-wide transition-colors",
              tab === "sensor"
                ? "bg-[var(--accent)] text-black"
                : "text-[var(--ink)]/80 hover:text-[var(--ink)]"
            )}
            onClick={(e) => {
              e.stopPropagation();
              setTab("sensor");
            }}
          >
            {t("tabSensor")}
          </button>
        </div>
      )}

      <div className="relative min-h-0 flex-1">
        {tab === "ui" && hasUi ? (
          <div
            ref={hostRef}
            className="relative h-full w-full overflow-hidden bg-[#0A1016]"
          >
            <iframe
              title={title || `${fw.name} UI preview`}
              src={fw.media.preview!}
              width={screenW}
              height={screenH}
              loading="lazy"
              sandbox="allow-scripts"
              tabIndex={-1}
              className="pointer-events-none absolute left-1/2 top-1/2 border-0 bg-[#0A1016]"
              style={{
                transform: `translate(-50%, -50%) scale(${scale})`,
                transformOrigin: "center center",
              }}
            />
          </div>
        ) : tab === "sensor" && sensor ? (
          <div className="flex h-full w-full flex-col items-center justify-center gap-2 bg-[radial-gradient(ellipse_at_50%_30%,rgba(240,197,10,0.08),transparent_60%),#0A1016] p-3">
            {/* eslint-disable-next-line @next/next/no-img-element */}
            <img
              src={sensor.src}
              alt={sensor.label}
              className="max-h-[78%] max-w-full object-contain drop-shadow-[0_8px_24px_rgba(0,0,0,0.45)]"
              loading="lazy"
              draggable={false}
            />
            <span className="text-center text-[0.7rem] font-medium tracking-wide text-[var(--muted)]">
              {sensor.label}
            </span>
          </div>
        ) : (
          <div className="flex h-full w-full flex-col items-center justify-center gap-2 bg-[radial-gradient(ellipse_at_30%_20%,rgba(240,197,10,0.18),transparent_55%),linear-gradient(160deg,#1a1610,#0e0c09)]">
            <span className="font-[family-name:var(--font-display)] text-3xl font-extrabold tracking-tight text-[var(--accent-hot)]/80">
              {initials || "FW"}
            </span>
            <span className="text-[0.65rem] uppercase tracking-[0.14em] text-[var(--muted)]">
              HTML preview soon
            </span>
          </div>
        )}
      </div>
    </div>
  );
}