import {GraphQLConfig, GraphQLProjectConfig} from 'graphql-config';
import {isAbsolute, resolve} from 'path';

import './augmentations';

export function getGraphQLProjects(config: GraphQLConfig) {
  const projects = config.getProjects();

  if (projects) {
    // multi-project configuration, return an array of projects
    return Object.values(projects);
  }

  const project = config.getProjectConfig();

  if (project) {
    // single project configuration, return an array of the single project
    return [project];
  }

  // invalid project configuration
  throw new Error(`No projects defined in '${config.configPath}'`);
}

export function getGraphQLSchemaPaths(config: GraphQLConfig) {
  return getGraphQLProjects(config).reduce<string[]>(
    (schemas, {schemaPath}) => {
      return schemaPath
        ? schemas.concat(getGraphQLFilePath(config, schemaPath))
        : schemas;
    },
    [],
  );
}

export function getGraphQLProjectForSchemaPath(
  config: GraphQLConfig,
  schemaPath: string,
) {
  const project =
    Object.values(config.getProjects() || {})
      .filter((project) => project.schemaPath === schemaPath)
      .shift() || config.getProjectConfig();

  if (!project || project.schemaPath !== schemaPath) {
    throw new Error(
      `No project defined in graphql config for schema '${schemaPath}'`,
    );
  }

  return project;
}

export function getGraphQLFilePath(
  config: GraphQLConfig | GraphQLProjectConfig,
  filePath: string,
) {
  return isAbsolute(filePath) ? filePath : resolve(config.configDir, filePath);
}