import { useEffect, useState } from "react";
import {
  WarningCircle,
  CircleNotch,
  FileText,
  Info,
} from "@phosphor-icons/react";
import type { Fact, Provenance } from "../lib/api";

export const ICON = { size: 16, weight: "regular" as const };

/** Error state. Inline, specific, never a bare "something went wrong". */
export function ErrorNote({ message, onRetry }: { message: string; onRetry?: () => void }) {
  return (
    <div className="err" role="alert">
      <WarningCircle size={17} weight="fill" style={{ flexShrink: 0, marginTop: 1 }} />
      <div>
        <div>{message}</div>
        {onRetry && (
          <button className="btn btn-ghost btn-sm" style={{ marginTop: 8 }} onClick={onRetry}>
            Try again
          </button>
        )}
      </div>
    </div>
  );
}

/** Loading state shaped like the table it replaces, not a spinner in a void. */
export function TableSkeleton({ rows = 8 }: { rows?: number }) {
  return (
    <div aria-busy="true" aria-label="Loading">
      {Array.from({ length: rows }).map((_, i) => (
        <div className="skel-row" key={i}>
          <div className="skel" style={{ width: `${58 + ((i * 13) % 34)}%` }} />
          <div className="skel" style={{ width: "68%" }} />
          <div className="skel" style={{ width: `${44 + ((i * 21) % 42)}%` }} />
          <div className="skel" style={{ width: "56%" }} />
        </div>
      ))}
    </div>
  );
}

export function Empty({
  icon, title, children,
}: { icon?: React.ReactNode; title: string; children?: React.ReactNode }) {
  return (
    <div className="empty">
      <div className="ico">{icon ?? <FileText size={26} />}</div>
      <h3>{title}</h3>
      {children && <p>{children}</p>}
    </div>
  );
}

export function Spinner() {
  return <CircleNotch size={15} className="spin" aria-hidden />;
}

export function Note({
  tone = "accent", children,
}: { tone?: "accent" | "warn" | "quiet"; children: React.ReactNode }) {
  const cls = tone === "warn" ? "note note-warn" : tone === "quiet" ? "note note-quiet" : "note";
  return <div className={cls}>{children}</div>;
}

/** Citation popover. Follows the pointer, driven by native hover events. */
export function CitationPopover({ container }: { container: React.RefObject<HTMLElement | null> }) {
  const [pop, setPop] = useState<{
    x: number; y: number; source: string; locator: string; raw: string; status: string;
  } | null>(null);

  useEffect(() => {
    // Listen on the document, not on container.current. The container renders
    // only once its content has loaded, so an effect that reads the ref on mount
    // finds null and silently never attaches: the popover would never appear.
    const onOver = (e: Event) => {
      const t = (e.target as HTMLElement)?.closest?.("cite");
      if (!t) return;
      if (container.current && !container.current.contains(t)) return;
      const r = t.getBoundingClientRect();
      setPop({
        x: Math.min(r.left, window.innerWidth - 440),
        y: r.bottom + 8,
        source: t.getAttribute("data-source") ?? "",
        locator: t.getAttribute("data-locator") ?? "",
        raw: t.getAttribute("data-raw") ?? "",
        status: t.getAttribute("data-status") ?? "",
      });
    };
    const onOut = (e: Event) => {
      if ((e.target as HTMLElement)?.closest?.("cite")) setPop(null);
    };

    document.addEventListener("mouseover", onOver);
    document.addEventListener("mouseout", onOut);
    return () => {
      document.removeEventListener("mouseover", onOver);
      document.removeEventListener("mouseout", onOut);
    };
  }, [container]);

  if (!pop) return null;
  return (
    <div className="pop" style={{ left: pop.x, top: pop.y }} role="tooltip">
      <div className="pop-t">
        {pop.status === "proposed" ? "proposed issue term" : `sourced · ${pop.status}`}
      </div>
      <div style={{ fontWeight: 500 }}>{pop.source}</div>
      <div style={{ color: "#93a5b8", marginTop: 2 }}>{pop.locator}</div>
      {pop.raw && <div className="pop-raw">{pop.raw}</div>}
    </div>
  );
}

/** Provenance rendered as a list, used in the ledger drawer. */
export function ProvenanceList({ provenance }: { provenance: Provenance[] }) {
  return (
    <div style={{ display: "grid", gap: 6 }}>
      {provenance.map((p, i) => (
        <div key={i} style={{ fontSize: 11.5, lineHeight: 1.5 }}>
          <div style={{ fontWeight: 500 }}>{p.source_title}</div>
          <div className="f-src">{p.locator}</div>
          {p.raw_line && <div className="ev-raw">{p.raw_line}</div>}
        </div>
      ))}
    </div>
  );
}

export function StatusChip({ status }: { status: string }) {
  return <span className={`chip chip-${status}`}>{status}</span>;
}

export function factTone(f: Fact): string {
  return f.status;
}

export { Info };