// Discord radio channels + radio-bot pool — shapes returned by c2-core
// (routers/discord.py GET /discord/admin/overview, routers/tokens.py), and
// small helpers shared by /settings/discord and /tokens (server-26#213).

import { legacyErrorText } from "@/lib/c2error";

export interface RadioBotLease {
  node_id: string;
  lease_id?: string;
  since?: string;
  streams?: string[];
  releasing?: boolean;
}

/** One bot_tokens doc as GET /tokens returns it — token string masked server-side. */
export interface RadioBot {
  token_id: string;
  name: string;
  token: string;
  org_id?: string | null;               // null = platform pool, else that org's BYO bot
  valid?: boolean | null;               // null/undefined = never checked (Discord unreachable)
  guild_ids?: string[] | null;          // null = membership unknown
  check_error?: string | null;
  validated_at?: string | null;
  application_id?: string | null;
  bot_name?: string | null;
  invite_url?: string | null;
  lease?: RadioBotLease | null;
  in_use?: boolean;
  assigned_node_id?: string | null;
  preferred_for_system_id?: string | null;
  /** "Connect a Discord server" is on for this bot: its OAuth client secret is
   *  set server-side (server-26#225 S6). The secret itself is never sent. */
  oauth_enabled?: boolean | null;
  /** GET /tokens (S6): the pool cap for a DRB pool bot, null for a BYO bot. */
  server_cap?: number | null;
}

export interface RadioBotAddResult {
  token_id: string;
  name: string;
  valid: boolean | null;
  guild_ids: string[] | null;
  check_error: string | null;
  invite_url: string | null;
}

export interface DiscordStreamActual {
  state?: string;
  error?: string | null;
  /** The node's reason code on error: login_failed, connect_failed, not_in_guild, bad_channel, no_audio. */
  code?: string | null;
  since?: string | null;
  at?: string | null;
}

export interface DiscordStream {
  stream_id: string;
  guild_id: string;
  channel_id: string;
  channel_name?: string | null;
  guild_name?: string | null;
  org_id?: string | null;
  system_id?: string;
  system_name?: string | null;
  mode?: "persistent" | "adhoc";
  desired?: "on" | "off";
  node_id?: string | null;
  node_name?: string | null;
  node_status?: string | null;
  token_id?: string | null;
  token_name?: string | null;
  actual?: DiscordStreamActual | null;
  stop_reason?: string | null;
  updated_at?: string | null;
  created_at?: string | null;
  /** POST /discord/streams: this system was already on in that channel — nothing was replaced. */
  already_on?: boolean;
}

export interface DiscordGuild {
  guild_id: string;
  guild_name: string | null;
  linked: boolean;
  org_id: string | null;
  linked_at: string | null;
  acting_org_id: string | null;
  acting_org_name: string | null;
  live_streams: number;
  /** How it was linked: "admin" | "code" | "oauth" (absent on older links). */
  linked_via?: string | null;
  /** The DRB server bot (optional, server-26#225): true/false as it last reported, null = never heard. */
  main_bot_present?: boolean | null;
  /** Who listed its voice channels: "main_bot" | "radio_bot". */
  directory_source?: string | null;
  /** Radio bots Discord last said are in this server (names). */
  radio_bots?: string[];
}

export interface DiscordAdminOverview {
  guilds: DiscordGuild[];
  streams: DiscordStream[];
  orgs: { org_id: string; name: string }[];
  node_names: Record<string, string>;
  systems: { system_id: string; name: string | null; org_id: string | null }[];
  limits: {
    guild_max_streams: number;
    node_max_streams: number;
    unlinked_guild_org_id: string | null;
    unlinked_guild_org_name: string | null;
    /** Connect stops picking a DRB pool bot at this many servers (owner ruling Q3). */
    pool_bot_guild_cap?: number;
  };
}

/** Discord's hard limit for an unverified bot. */
export const DISCORD_UNVERIFIED_GUILD_LIMIT = 100;
/** settings.discord_pool_bot_guild_cap's default — used when the overview doesn't send it. */
export const POOL_BOT_GUILD_CAP = 90;

/** A desired-on channel that has not reached "connected" for this long turns red. */
export const STUCK_AFTER_MS = 2 * 60 * 1000;

export type Health = "ok" | "warn" | "bad" | "off";

export function streamHealth(s: DiscordStream, now = Date.now()): { health: Health; label: string } {
  const state = s.actual?.state ?? "pending";
  if (s.desired !== "on") {
    return { health: "off", label: state === "stopping" ? "off → stopping" : "off" };
  }
  if (state === "connected") return { health: "ok", label: "on → connected" };
  if (state === "error" || state === "node_offline") return { health: "bad", label: `on → ${state.replace("_", " ")}` };
  const since = s.actual?.since ? Date.parse(s.actual.since) : NaN;
  if (!Number.isNaN(since) && now - since > STUCK_AFTER_MS) {
    const mins = Math.round((now - since) / 60000);
    return { health: "bad", label: `on → ${state} for ${mins} min` };
  }
  return { health: "warn", label: `on → ${state.replace("_", " ")}` };
}

/** The pool bot's invite link pinned to one server (same params c2-core's invite_url(app, guild) adds). */
export function inviteForGuild(inviteUrl: string | null | undefined, guildId: string): string | null {
  if (!inviteUrl) return null;
  return `${inviteUrl}&guild_id=${encodeURIComponent(guildId)}&disable_guild_select=true`;
}

export function guildLabel(g: { guild_id: string; guild_name?: string | null }): string {
  return g.guild_name || `server ${shortId(g.guild_id)}`;
}

/** 1152…4402 — enough to tell snowflakes apart without a 19-digit column. */
export function shortId(id: string | null | undefined): string {
  if (!id) return "—";
  return id.length > 10 ? `${id.slice(0, 4)}…${id.slice(-4)}` : id;
}

export const SNOWFLAKE = /^\d{15,21}$/;

/**
 * c2api's request() throws `C2 API error <status>: <body>`. Discord routes
 * answer with `{detail, code, invite: [{name, invite_url}]}` — pull those out
 * so "no bot in this server" can render its invite links.
 */
export function parseC2Error(err: unknown): { message: string; invite: { name: string; invite_url: string | null }[] } {
  const raw = legacyErrorText(err);
  const m = raw.match(/^C2 API error (\d+): ([\s\S]*)$/);
  if (m) {
    try {
      const body = JSON.parse(m[2]);
      const detail = typeof body?.detail === "string" ? body.detail : Array.isArray(body?.detail) ? body.detail.map((d: { msg?: string }) => d.msg).join("; ") : null;
      return { message: detail || raw, invite: Array.isArray(body?.invite) ? body.invite : [] };
    } catch {
      return { message: m[2] || raw, invite: [] };
    }
  }
  return { message: raw, invite: [] };
}

export function fmtWhen(iso: string | null | undefined): string {
  if (!iso) return "—";
  const d = new Date(iso);
  if (Number.isNaN(d.getTime())) return "—";
  const sameDay = d.toDateString() === new Date().toDateString();
  return sameDay
    ? d.toLocaleTimeString("en-US", { hour: "numeric", minute: "2-digit" })
    : d.toLocaleDateString("en-US", { month: "short", day: "numeric" });
}