import produce from 'immer';
import { normalizeData } from 'ee_else_ce/repository/utils/commit';
import axios from '~/lib/utils/axios_utils';
import commitsQuery from './queries/commits.query.graphql';
import projectPathQuery from './queries/project_path.query.graphql';
import refQuery from './queries/ref.query.graphql';

let fetchpromise;
let resolvers = [];

export function resolveCommit(commits, path, { resolve, entry }) {
  const commit = commits.find(c => c.filePath === `${path}/${entry.name}` && c.type === entry.type);

  if (commit) {
    resolve(commit);
  }
}

export function fetchLogsTree(client, path, offset, resolver = null) {
  if (resolver) {
    resolvers.push(resolver);
  }

  if (fetchpromise) return fetchpromise;

  const { projectPath } = client.readQuery({ query: projectPathQuery });
  const { escapedRef } = client.readQuery({ query: refQuery });

  fetchpromise = axios
    .get(
      `${gon.relative_url_root}/${projectPath}/-/refs/${escapedRef}/logs_tree/${encodeURIComponent(
        path.replace(/^\//, ''),
      )}`,
      {
        params: { format: 'json', offset },
      },
    )
    .then(({ data: newData, headers }) => {
      const headerLogsOffset = headers['more-logs-offset'];
      const sourceData = client.readQuery({ query: commitsQuery });
      const data = produce(sourceData, draftState => {
        draftState.commits.push(...normalizeData(newData, path));
      });
      client.writeQuery({
        query: commitsQuery,
        data,
      });

      resolvers.forEach(r => resolveCommit(data.commits, path, r));

      fetchpromise = null;

      if (headerLogsOffset) {
        fetchLogsTree(client, path, headerLogsOffset);
      } else {
        resolvers = [];
      }
    });

  return fetchpromise;
}