import type { OpenClawConfig } from "../../config/config.js";
import { formatErrorMessage } from "../../infra/errors.js";
import { createSubsystemLogger } from "../../logging/subsystem.js";
import {
  listChannelCatalogEntries,
  type PluginChannelCatalogEntry,
} from "../../plugins/channel-catalog-registry.js";
import {
  isJavaScriptModulePath,
  loadChannelPluginModule,
  resolveExistingPluginModulePath,
} from "./module-loader.js";

type ChannelPackageStateChecker = (params: {
  cfg: OpenClawConfig;
  env?: NodeJS.ProcessEnv;
}) => boolean;

type ChannelPackageStateMetadata = {
  specifier?: string;
  exportName?: string;
};

export type ChannelPackageStateMetadataKey = "configuredState" | "persistedAuthState";

type ChannelPackageStateRegistry = {
  catalog: PluginChannelCatalogEntry[];
  entriesById: Map<string, PluginChannelCatalogEntry>;
  checkerCache: Map<string, ChannelPackageStateChecker | null>;
};

const log = createSubsystemLogger("channels");
const registryCache = new Map<ChannelPackageStateMetadataKey, ChannelPackageStateRegistry>();

function resolveChannelPackageStateMetadata(
  entry: PluginChannelCatalogEntry,
  metadataKey: ChannelPackageStateMetadataKey,
): ChannelPackageStateMetadata | null {
  const metadata = entry.channel[metadataKey];
  if (!metadata || typeof metadata !== "object") {
    return null;
  }
  const specifier = typeof metadata.specifier === "string" ? metadata.specifier.trim() : "";
  const exportName = typeof metadata.exportName === "string" ? metadata.exportName.trim() : "";
  if (!specifier || !exportName) {
    return null;
  }
  return { specifier, exportName };
}

function getChannelPackageStateRegistry(
  metadataKey: ChannelPackageStateMetadataKey,
): ChannelPackageStateRegistry {
  const cached = registryCache.get(metadataKey);
  if (cached) {
    return cached;
  }
  const catalog = listChannelCatalogEntries({ origin: "bundled" }).filter((entry) =>
    Boolean(resolveChannelPackageStateMetadata(entry, metadataKey)),
  );
  const registry = {
    catalog,
    entriesById: new Map(catalog.map((entry) => [entry.pluginId, entry] as const)),
    checkerCache: new Map(),
  } satisfies ChannelPackageStateRegistry;
  registryCache.set(metadataKey, registry);
  return registry;
}

function resolveChannelPackageStateChecker(params: {
  entry: PluginChannelCatalogEntry;
  metadataKey: ChannelPackageStateMetadataKey;
}): ChannelPackageStateChecker | null {
  const registry = getChannelPackageStateRegistry(params.metadataKey);
  const cached = registry.checkerCache.get(params.entry.pluginId);
  if (cached !== undefined) {
    return cached;
  }

  const metadata = resolveChannelPackageStateMetadata(params.entry, params.metadataKey);
  if (!metadata) {
    registry.checkerCache.set(params.entry.pluginId, null);
    return null;
  }

  try {
    const moduleExport = loadChannelPluginModule({
      modulePath: resolveExistingPluginModulePath(params.entry.rootDir, metadata.specifier!),
      rootDir: params.entry.rootDir,
      shouldTryNativeRequire: isJavaScriptModulePath,
    }) as Record<string, unknown>;
    const checker = moduleExport[metadata.exportName!] as ChannelPackageStateChecker | undefined;
    if (typeof checker !== "function") {
      throw new Error(`missing ${params.metadataKey} export ${metadata.exportName}`);
    }
    registry.checkerCache.set(params.entry.pluginId, checker);
    return checker;
  } catch (error) {
    const detail = formatErrorMessage(error);
    log.warn(
      `[channels] failed to load ${params.metadataKey} checker for ${params.entry.pluginId}: ${detail}`,
    );
    registry.checkerCache.set(params.entry.pluginId, null);
    return null;
  }
}

export function listBundledChannelIdsForPackageState(
  metadataKey: ChannelPackageStateMetadataKey,
): string[] {
  return getChannelPackageStateRegistry(metadataKey).catalog.map((entry) => entry.pluginId);
}

export function hasBundledChannelPackageState(params: {
  metadataKey: ChannelPackageStateMetadataKey;
  channelId: string;
  cfg: OpenClawConfig;
  env?: NodeJS.ProcessEnv;
}): boolean {
  const registry = getChannelPackageStateRegistry(params.metadataKey);
  const entry = registry.entriesById.get(params.channelId);
  if (!entry) {
    return false;
  }
  const checker = resolveChannelPackageStateChecker({
    entry,
    metadataKey: params.metadataKey,
  });
  return checker ? Boolean(checker({ cfg: params.cfg, env: params.env })) : false;
}
