import type { VoiceProvider } from "@rakazo/adapter-kit";
import { KokoroVoiceProvider } from "./kokoro-voice.js";
import { SCRIPTED_VOICE_CATALOG_ENTRY, ScriptedVoiceProvider } from "./scripted-voice.js";

export const VOICE_CATALOG = [
  {
    id: "kokoro",
    name: "Local voice",
    description: "Free local speech on your server.",
    transcribe: false,
  },
] as const;

export { SCRIPTED_VOICE_CATALOG_ENTRY };

export type HostedVoiceProviderId = (typeof VOICE_CATALOG)[number]["id"];
export type VoiceProviderId = HostedVoiceProviderId | "scripted";

export function scriptedVoiceEnabled() {
  return process.env.AGENT_RUNTIME === "scripted";
}

export function listVoiceCatalog() {
  return scriptedVoiceEnabled()
    ? [...VOICE_CATALOG, SCRIPTED_VOICE_CATALOG_ENTRY]
    : [...VOICE_CATALOG];
}

export function voiceCatalogEntry(id: string) {
  if (id === SCRIPTED_VOICE_CATALOG_ENTRY.id) return SCRIPTED_VOICE_CATALOG_ENTRY;
  return VOICE_CATALOG.find((entry) => entry.id === id);
}

export function isVoiceProviderId(value: string): value is VoiceProviderId {
  if (value === "scripted") return scriptedVoiceEnabled();
  return VOICE_CATALOG.some((entry) => entry.id === value);
}

/** Construct the provider adapter selected by a persisted voice credential. */
export function createVoiceProvider(kind: string): VoiceProvider {
  switch (kind) {
    case "kokoro":
      return new KokoroVoiceProvider();
    case "scripted":
      if (!scriptedVoiceEnabled()) break;
      return new ScriptedVoiceProvider();
    default:
      break;
  }
  throw new Error(`Unknown voice provider "${kind}". Use kokoro.`);
}

export class NoVoiceConfigured extends Error {
  readonly reason: "key" | "voice";

  constructor(reason: "key" | "voice") {
    super(
      reason === "key" ? "Turn on speaking in Voice settings." : "Pick a voice in Voice settings.",
    );
    this.reason = reason;
    this.name = "NoVoiceConfigured";
  }
}

export const MAX_SPEAK_CHARS = 2000;
export const MAX_TRANSCRIBE_BYTES = 8 * 1024 * 1024;