import { IntrospectionResult, BuildQuery } from 'ra-data-graphql';
import buildVariables from './buildVariables';
import buildGqlQuery from './buildGqlQuery';
import getResponseParser from './getResponseParser';

export const buildQueryFactory =
    (
        buildVariablesImpl = buildVariables,
        buildGqlQueryImpl = buildGqlQuery,
        getResponseParserImpl = getResponseParser
    ) =>
    (introspectionResults: IntrospectionResult): BuildQuery => {
        const knownResources = introspectionResults.resources.map(
            r => r.type.name
        );

        const buildQuery: BuildQuery = (raFetchType, resourceName, params) => {
            const resource = introspectionResults.resources.find(
                r => r.type.name === resourceName
            );

            if (!resource) {
                throw new Error(
                    `Unknown resource ${resourceName}. Make sure it has been declared on your server side schema. Known resources are ${knownResources.join(
                        ', '
                    )}`
                );
            }

            const queryType = resource[raFetchType];

            if (!queryType) {
                throw new Error(
                    `No query or mutation matching fetch type ${raFetchType} could be found for resource ${resource.type.name}`
                );
            }

            const variables = buildVariablesImpl(introspectionResults)(
                resource,
                raFetchType,
                params,
                queryType
            );
            const query = buildGqlQueryImpl(introspectionResults)(
                resource,
                raFetchType,
                queryType,
                variables
            );
            const parseResponse = getResponseParserImpl(introspectionResults)(
                raFetchType,
                resource,
                queryType
            );

            return {
                query,
                variables,
                parseResponse,
            };
        };

        return buildQuery;
    };

export default buildQueryFactory(
    buildVariables,
    buildGqlQuery,
    getResponseParser
);