import {
  EncryptedMetadataManager,
  MetadataEntry,
  SettingsManager,
} from "@saleor/app-sdk/settings-manager";
import { Client, gql } from "urql";
import {
  FetchAppDetailsDocument,
  FetchAppDetailsQuery,
  RemovePrivateMetadataDocument,
  UpdateAppMetadataDocument,
} from "../../generated/graphql";

gql`
  mutation UpdateAppMetadata($id: ID!, $input: [MetadataInput!]!) {
    updatePrivateMetadata(id: $id, input: $input) {
      item {
        privateMetadata {
          key
          value
        }
      }
    }
  }
`;

gql`
  query FetchAppDetails {
    app {
      id
      privateMetadata {
        key
        value
      }
    }
  }
`;

gql`
  mutation RemovePrivateMetadata($id: ID!, $keys: [String!]!) {
    deletePrivateMetadata(id: $id, keys: $keys) {
      errors {
        message
      }
    }
  }
`;

export async function fetchAllMetadata(client: Pick<Client, "query">): Promise<MetadataEntry[]> {
  const { error, data } = await client
    .query<FetchAppDetailsQuery>(FetchAppDetailsDocument, {})
    .toPromise();

  if (error) {
    return [];
  }

  return data?.app?.privateMetadata.map((md) => ({ key: md.key, value: md.value })) || [];
}

export async function mutateMetadata(
  client: Pick<Client, "query" | "mutation">,
  metadata: MetadataEntry[]
) {
  // to update the metadata, ID is required
  const { error: idQueryError, data: idQueryData } = await client
    .query(FetchAppDetailsDocument, {})
    .toPromise();

  if (idQueryError) {
    throw new Error(
      "Could not fetch the app id. Please check if auth data for the client are valid."
    );
  }

  const appId = idQueryData?.app?.id;

  if (!appId) {
    throw new Error("Could not fetch the app ID");
  }

  const { error: mutationError, data: mutationData } = await client
    .mutation(UpdateAppMetadataDocument, {
      id: appId,
      input: metadata,
    })
    .toPromise();

  if (mutationError) {
    throw new Error(`Mutation error: ${mutationError.message}`);
  }

  return (
    mutationData?.updatePrivateMetadata?.item?.privateMetadata.map((md) => ({
      key: md.key,
      value: md.value,
    })) || []
  );
}

export const createSettingsManager = (
  client: Pick<Client, "query" | "mutation">,
  appId: string
): SettingsManager => {
  /*
   * EncryptedMetadataManager gives you interface to manipulate metadata and cache values in memory.
   * We recommend it for production, because all values are encrypted.
   * If your use case require plain text values, you can use MetadataManager.
   */
  return new EncryptedMetadataManager({
    // Secret key should be randomly created for production and set as environment variable
    encryptionKey: process.env.SECRET_KEY!,
    fetchMetadata: () => fetchAllMetadata(client),
    mutateMetadata: (metadata) => mutateMetadata(client, metadata),
    async deleteMetadata(keys) {
      await client.mutation(RemovePrivateMetadataDocument, {
        id: appId,
        keys: keys,
      });
    },
  });
};
