"use client";

// Per-bot voice-channel permission status (server-26#225 S4). Shared by the
// node-page picker (NodeDiscordRadio) and the admin Add form (StreamsPanel),
// both fed by c2-core routers/discord_checks.py. Start is disabled only on a
// DEFINITE refusal ("Needs fix", "Not a voice channel"); "Couldn't check"
// fails open — a Discord outage must never block a start.

import { useEffect, useState } from "react";
import {
  agoText,
  botLine,
  deniedSentence,
  fixSentence,
  type ChannelVerdict,
  type DiscordInvite,
  type VoiceCheckChannel,
} from "@/lib/discordPicker";

const PILL = "inline-flex items-center gap-1 rounded px-1.5 py-px text-[11px] font-medium whitespace-nowrap border";

const BADGE: Record<ChannelVerdict["kind"], { label: string; cls: string; title?: string }> = {
  ready: { label: "Ready", cls: "border-green-500/40 text-green-500" },
  fix: { label: "Needs fix", cls: "border-sev-major/50 text-sev-major" },
  not_voice: { label: "Not a voice channel", cls: "border-sev-major/50 text-sev-major" },
  busy: {
    label: "Bots busy",
    cls: "border-sev-moderate/50 text-sev-moderate",
    title: "A bot could stream here, but each one that can is already in another channel of this server or on another node.",
  },
  no_bot: { label: "No radio bot", cls: "border-sev-moderate/50 text-sev-moderate", title: "No radio bot is in this Discord server yet." },
  unknown: { label: "Couldn't check", cls: "border-line text-ink-muted", title: "Discord didn't answer the check — DRB will still try." },
};

/** Ready / Needs fix / Couldn't check / …, plus "Limit N" when the channel has a user limit. */
export function VerdictBadge({ verdict, loading }: { verdict: ChannelVerdict | null; loading?: boolean }) {
  if (!verdict) {
    return loading ? <span className={`${PILL} border-line text-ink-muted`}>Checking…</span> : null;
  }
  const b = BADGE[verdict.kind];
  // Name the missing permission right on the badge: "Needs fix · can't Speak".
  const label =
    verdict.kind === "fix" && verdict.bot.missing.length
      ? `${b.label} · can't ${verdict.bot.missing.join(", ")}`
      : b.label;
  const title = verdict.kind === "fix" ? `${verdict.bot.name}: ${verdict.bot.reason ?? "missing permission"}` : b.title;
  return (
    <span className="inline-flex gap-1 flex-wrap">
      <span className={`${PILL} ${b.cls}`} title={title}>{label}</span>
      {verdict.limit > 0 && (
        <span
          className={`${PILL} border-line text-ink-muted`}
          title="Discord user limit. DRB can't see who is connected, so a full channel only shows up when the bot tries to join."
        >
          Limit {verdict.limit}
        </span>
      )}
    </span>
  );
}

/** The sentence under a "Needs fix" / "Not a voice channel" channel. */
export function FixText({ verdict, channelName }: { verdict: ChannelVerdict; channelName: string | null }) {
  if (verdict.kind === "not_voice") {
    return <span className="block text-xs text-sev-major mt-1">That is not a voice channel. Radio can only play in a voice channel.</span>;
  }
  if (verdict.kind !== "fix") return null;
  return (
    <span className="block text-xs text-sev-major mt-1">
      {deniedSentence(verdict.bot, channelName)} {fixSentence(verdict.bot)}
    </span>
  );
}

const TONE: Record<"ok" | "bad" | "warn" | "muted", string> = {
  ok: "text-green-500",
  bad: "text-sev-major",
  warn: "text-sev-moderate",
  muted: "text-ink-muted",
};
const MARK: Record<"ok" | "bad" | "warn" | "muted", string> = { ok: "✓", bad: "✕", warn: "•", muted: "?" };

/** Expandable per-bot detail for one channel. */
export function BotDetails({ channel, channelName }: { channel: VoiceCheckChannel | null | undefined; channelName: string | null }) {
  if (!channel || channel.bots.length === 0) return null;
  return (
    <details className="text-xs mt-1">
      <summary className="cursor-pointer text-ink-muted hover:text-ink select-none">
        Radio bots in this server ({channel.bots.length})
      </summary>
      <ul className="mt-1 space-y-0.5 pl-1">
        {channel.bots.map((b, i) => {
          const l = botLine(b, channelName);
          return (
            <li key={`${b.token_id ?? b.name}-${i}`} className={TONE[l.tone]}>
              <span aria-hidden className="inline-block w-3">{MARK[l.tone]}</span> {l.text}
              {b.status === "denied" && <span className="block pl-3 text-ink-muted">{fixSentence(b)}</span>}
            </li>
          );
        })}
      </ul>
    </details>
  );
}

/** "Permissions checked 40s ago · Re-check". Ticks on its own so the age stays honest. */
export function CheckFooter({
  checkedAt,
  busy,
  error,
  disabled,
  limited,
  invite,
  onRecheck,
}: {
  checkedAt: string | null;
  busy: boolean;
  error: string | null;
  disabled?: boolean;
  /** A Re-check was rate limited server-side (once per 10 s); the cached answer is shown. */
  limited?: boolean;
  invite?: DiscordInvite[];
  onRecheck: () => void;
}) {
  const [now, setNow] = useState(() => Date.now());
  useEffect(() => {
    const t = setInterval(() => setNow(Date.now()), 10_000);
    return () => clearInterval(t);
  }, []);
  const ago = agoText(checkedAt, now);
  if (disabled) {
    return <div className="text-xs text-ink-muted">Permission check is off — DRB tries any free radio bot.</div>;
  }
  return (
    <div className="text-xs text-ink-muted flex flex-wrap items-center gap-x-2 gap-y-1">
      <span>{busy ? "Checking permissions…" : ago ? `Permissions checked ${ago}` : "Permissions not checked yet"}</span>
      <span aria-hidden>·</span>
      <button type="button" onClick={onRecheck} disabled={busy} className="text-accent hover:underline disabled:opacity-50">
        Re-check
      </button>
      {limited && !busy && (
        <span className="basis-full">Re-check runs at most once every 10 seconds — this is the last result. Try again in a moment.</span>
      )}
      {error && <span className="basis-full text-sev-moderate">Couldn&apos;t check permissions: {error}</span>}
      {invite && invite.length > 0 && (
        <span className="basis-full flex flex-wrap gap-x-3 gap-y-1">
          <span>Add another radio bot to this server:</span>
          {invite.map((i) => (
            <a key={i.invite_url} href={i.invite_url} target="_blank" rel="noopener noreferrer" className="text-accent hover:underline">
              Invite {i.name}
            </a>
          ))}
        </span>
      )}
    </div>
  );
}