import type { OpenClawConfig } from "../../config/config.js";
import { DEFAULT_ACCOUNT_ID, normalizeAccountId } from "../../routing/session-key.js";

type ChannelSectionBase = {
  name?: string;
  accounts?: Record<string, Record<string, unknown>>;
};

function channelHasAccounts(cfg: OpenClawConfig, channelKey: string): boolean {
  const channels = cfg.channels as Record<string, unknown> | undefined;
  const base = channels?.[channelKey] as ChannelSectionBase | undefined;
  return Boolean(base?.accounts && Object.keys(base.accounts).length > 0);
}

function shouldStoreNameInAccounts(params: {
  cfg: OpenClawConfig;
  channelKey: string;
  accountId: string;
  alwaysUseAccounts?: boolean;
}): boolean {
  if (params.alwaysUseAccounts) {
    return true;
  }
  if (params.accountId !== DEFAULT_ACCOUNT_ID) {
    return true;
  }
  return channelHasAccounts(params.cfg, params.channelKey);
}

export function applyAccountNameToChannelSection(params: {
  cfg: OpenClawConfig;
  channelKey: string;
  accountId: string;
  name?: string;
  alwaysUseAccounts?: boolean;
}): OpenClawConfig {
  const trimmed = params.name?.trim();
  if (!trimmed) {
    return params.cfg;
  }
  const accountId = normalizeAccountId(params.accountId);
  const channels = params.cfg.channels as Record<string, unknown> | undefined;
  const baseConfig = channels?.[params.channelKey];
  const base =
    typeof baseConfig === "object" && baseConfig ? (baseConfig as ChannelSectionBase) : undefined;
  const useAccounts = shouldStoreNameInAccounts({
    cfg: params.cfg,
    channelKey: params.channelKey,
    accountId,
    alwaysUseAccounts: params.alwaysUseAccounts,
  });
  if (!useAccounts && accountId === DEFAULT_ACCOUNT_ID) {
    const safeBase = base ?? {};
    return {
      ...params.cfg,
      channels: {
        ...params.cfg.channels,
        [params.channelKey]: {
          ...safeBase,
          name: trimmed,
        },
      },
    } as OpenClawConfig;
  }
  const baseAccounts: Record<string, Record<string, unknown>> = base?.accounts ?? {};
  const existingAccount = baseAccounts[accountId] ?? {};
  const baseWithoutName =
    accountId === DEFAULT_ACCOUNT_ID
      ? (({ name: _ignored, ...rest }) => rest)(base ?? {})
      : (base ?? {});
  return {
    ...params.cfg,
    channels: {
      ...params.cfg.channels,
      [params.channelKey]: {
        ...baseWithoutName,
        accounts: {
          ...baseAccounts,
          [accountId]: {
            ...existingAccount,
            name: trimmed,
          },
        },
      },
    },
  } as OpenClawConfig;
}

export function migrateBaseNameToDefaultAccount(params: {
  cfg: OpenClawConfig;
  channelKey: string;
  alwaysUseAccounts?: boolean;
}): OpenClawConfig {
  if (params.alwaysUseAccounts) {
    return params.cfg;
  }
  const channels = params.cfg.channels as Record<string, unknown> | undefined;
  const base = channels?.[params.channelKey] as ChannelSectionBase | undefined;
  const baseName = base?.name?.trim();
  if (!baseName) {
    return params.cfg;
  }
  const accounts: Record<string, Record<string, unknown>> = {
    ...base?.accounts,
  };
  const defaultAccount = accounts[DEFAULT_ACCOUNT_ID] ?? {};
  if (!defaultAccount.name) {
    accounts[DEFAULT_ACCOUNT_ID] = { ...defaultAccount, name: baseName };
  }
  const { name: _ignored, ...rest } = base ?? {};
  return {
    ...params.cfg,
    channels: {
      ...params.cfg.channels,
      [params.channelKey]: {
        ...rest,
        accounts,
      },
    },
  } as OpenClawConfig;
}

type ChannelSectionRecord = Record<string, unknown> & {
  accounts?: Record<string, Record<string, unknown>>;
};

const COMMON_SINGLE_ACCOUNT_KEYS_TO_MOVE = new Set([
  "name",
  "token",
  "tokenFile",
  "botToken",
  "appToken",
  "account",
  "signalNumber",
  "authDir",
  "cliPath",
  "dbPath",
  "httpUrl",
  "httpHost",
  "httpPort",
  "webhookPath",
  "webhookUrl",
  "webhookSecret",
  "service",
  "region",
  "homeserver",
  "userId",
  "accessToken",
  "password",
  "deviceName",
  "url",
  "code",
  "dmPolicy",
  "allowFrom",
  "groupPolicy",
  "groupAllowFrom",
  "defaultTo",
]);

const SINGLE_ACCOUNT_KEYS_TO_MOVE_BY_CHANNEL: Record<string, ReadonlySet<string>> = {
  telegram: new Set(["streaming"]),
};

export function shouldMoveSingleAccountChannelKey(params: {
  channelKey: string;
  key: string;
}): boolean {
  if (COMMON_SINGLE_ACCOUNT_KEYS_TO_MOVE.has(params.key)) {
    return true;
  }
  return SINGLE_ACCOUNT_KEYS_TO_MOVE_BY_CHANNEL[params.channelKey]?.has(params.key) ?? false;
}

function cloneIfObject<T>(value: T): T {
  if (value && typeof value === "object") {
    return structuredClone(value);
  }
  return value;
}

// When promoting a single-account channel config to multi-account,
// move top-level account settings into accounts.default so the original
// account keeps working without duplicate account values at channel root.
export function moveSingleAccountChannelSectionToDefaultAccount(params: {
  cfg: OpenClawConfig;
  channelKey: string;
}): OpenClawConfig {
  const channels = params.cfg.channels as Record<string, unknown> | undefined;
  const baseConfig = channels?.[params.channelKey];
  const base =
    typeof baseConfig === "object" && baseConfig ? (baseConfig as ChannelSectionRecord) : undefined;
  if (!base) {
    return params.cfg;
  }

  const accounts = base.accounts ?? {};
  if (Object.keys(accounts).length > 0) {
    return params.cfg;
  }

  const keysToMove = Object.entries(base)
    .filter(
      ([key, value]) =>
        key !== "accounts" &&
        key !== "enabled" &&
        value !== undefined &&
        shouldMoveSingleAccountChannelKey({ channelKey: params.channelKey, key }),
    )
    .map(([key]) => key);
  const defaultAccount: Record<string, unknown> = {};
  for (const key of keysToMove) {
    const value = base[key];
    defaultAccount[key] = cloneIfObject(value);
  }
  const nextChannel: ChannelSectionRecord = { ...base };
  for (const key of keysToMove) {
    delete nextChannel[key];
  }

  return {
    ...params.cfg,
    channels: {
      ...params.cfg.channels,
      [params.channelKey]: {
        ...nextChannel,
        accounts: {
          ...accounts,
          [DEFAULT_ACCOUNT_ID]: defaultAccount,
        },
      },
    },
  } as OpenClawConfig;
}