"use client";

import Link from "next/link";
import { useEffect, useRef, useState } from "react";
import { featured, projectById, projects } from "@/content/projects";
import { Segment } from "./Segment";

const ROOT = featured[0];

export function FeaturedNodes() {
  const [active, setActive] = useState<string | null>(null);
  const nodes = featured.map((f) => ({ ...f, project: projectById(f.id)! }));
  const stageRef = useRef<HTMLDivElement>(null);
  const [size, setSize] = useState<{ w: number; h: number } | null>(null);

  // Lines are drawn in px so they stay 1px crisp at any stage size.
  useEffect(() => {
    const el = stageRef.current;
    if (!el) return;
    const ro = new ResizeObserver(([e]) => setSize({ w: e.contentRect.width, h: e.contentRect.height }));
    ro.observe(el);
    return () => ro.disconnect();
  }, []);

  return (
    <div
      ref={stageRef}
      className="bracket grid-bg relative mt-8 flex flex-col gap-1 border border-white/6 bg-surface p-6 [--bc:rgb(242_244_245/0.35)] md:block md:h-[460px] md:p-0"
      onMouseLeave={() => setActive(null)}
    >
      {size && (
        <div aria-hidden="true" className="hidden md:block">
          {nodes.slice(1).map((n) => (
            <Segment
              key={`${n.id}-${active === n.id}`}
              x1={(ROOT.x / 100) * size.w}
              y1={(ROOT.y / 100) * size.h}
              x2={(n.x / 100) * size.w}
              y2={(n.y / 100) * size.h}
              on={active === n.id}
              dashed
              strong
            />
          ))}
        </div>
      )}

      {nodes.map((n) => {
        const on = active === n.id;
        const root = n.project.root;
        return (
          <Link
            key={n.id}
            href={`/projects/#${n.id}`}
            onMouseEnter={() => setActive(n.id)}
            onFocus={() => setActive(n.id)}
            onBlur={() => setActive(null)}
            className="group relative block min-h-12 outline-none md:absolute md:top-(--y) md:left-(--x) md:min-h-0"
            style={{ "--x": `${n.x}%`, "--y": `${n.y}%` } as React.CSSProperties}
          >
            <span
              aria-hidden="true"
              className={`absolute box-border border ${
                root
                  ? "top-2.5 left-0 size-7 rounded-full md:-top-3.5 md:-left-3.5"
                  : "top-4 left-2 size-3 md:-top-1.5 md:-left-1.5"
              } ${on ? "border-accent shadow-[0_0_14px_var(--color-accent)]" : "border-ink/60"} ${on && !root ? "bg-accent" : "bg-night"}`}
            >
              {root && <span className={`absolute top-[9px] left-[9px] size-2 rounded-full ${on ? "bg-accent" : "bg-ink"}`} />}
            </span>
            <span
              className={`bracket ml-10 block min-h-11 px-3 py-2.5 group-focus-visible:outline group-focus-visible:outline-accent md:absolute md:-top-[22px] md:ml-0 ${
                root ? "md:right-6 md:w-max md:text-right" : "md:left-6 md:w-[280px]"
              } ${
                on ? "[--bc:var(--color-accent)]" : "[--bc:transparent]"
              }`}
            >
              <span className={`flex items-baseline gap-3 ${root ? "md:flex-row-reverse" : ""}`}>
                <span className="font-display text-lg font-semibold tracking-[0.08em] uppercase">{n.project.name}</span>
                <span className="text-[9px] tracking-[0.22em] text-mute">{root ? "ROOT" : n.project.status}</span>
              </span>
              <span className={`mt-1.5 block text-[11px] leading-[1.55] text-ink-2 ${on && !root ? "" : "md:sr-only"}`}>{n.project.desc}</span>
            </span>
          </Link>
        );
      })}

      <div aria-hidden="true" className="absolute right-4 bottom-3 hidden text-[9px] tracking-[0.2em] text-mute/70 md:block">
        ROOT ORUS · {featured.length} OF {projects.length} NODES
      </div>
    </div>
  );
}