import { CHANNEL_IDS, listChatChannelAliases } from "../channels/ids.js";
import {
  listRegisteredChannelPluginAliases,
  listRegisteredChannelPluginIds,
} from "../channels/registry.js";
import {
  INTERNAL_MESSAGE_CHANNEL,
  type InternalMessageChannel,
} from "./message-channel-constants.js";
import { normalizeMessageChannel as normalizeMessageChannelCore } from "./message-channel-core.js";

type ChannelId = string & { readonly __openclawChannelIdBrand?: never };

export type DeliverableMessageChannel = ChannelId;

export type GatewayMessageChannel = DeliverableMessageChannel;

export type GatewayAgentChannelHint = GatewayMessageChannel;

export function normalizeMessageChannel(raw?: string | null): string | undefined {
  return normalizeMessageChannelCore(raw);
}

const listPluginChannelIds = (): string[] => {
  return listRegisteredChannelPluginIds();
};

const listPluginChannelAliases = (): string[] => {
  return listRegisteredChannelPluginAliases();
};

export const listDeliverableMessageChannels = (): ChannelId[] =>
  Array.from(new Set([...CHANNEL_IDS, ...listPluginChannelIds()]));

export const listGatewayMessageChannels = (): GatewayMessageChannel[] => [
  ...listDeliverableMessageChannels(),
  INTERNAL_MESSAGE_CHANNEL,
];

export const listGatewayAgentChannelAliases = (): string[] =>
  Array.from(new Set([...listChatChannelAliases(), ...listPluginChannelAliases()]));

export const listGatewayAgentChannelValues = (): string[] =>
  Array.from(
    new Set([...listGatewayMessageChannels(), "last", ...listGatewayAgentChannelAliases()]),
  );

export function isGatewayMessageChannel(value: string): value is GatewayMessageChannel {
  return listGatewayMessageChannels().includes(value as GatewayMessageChannel);
}

export function isDeliverableMessageChannel(value: string): value is DeliverableMessageChannel {
  return listDeliverableMessageChannels().includes(value as DeliverableMessageChannel);
}

export function resolveGatewayMessageChannel(
  raw?: string | null,
): GatewayMessageChannel | undefined {
  const normalized = normalizeMessageChannel(raw);
  if (!normalized) {
    return undefined;
  }
  return isGatewayMessageChannel(normalized) ? normalized : undefined;
}

export function resolveMessageChannel(
  primary?: string | null,
  fallback?: string | null,
): string | undefined {
  return normalizeMessageChannel(primary) ?? normalizeMessageChannel(fallback);
}

export type { InternalMessageChannel };