export const CMS_BRANCH_PREFIX = 'cms';
export const DEFAULT_PR_BODY = 'Automatically generated by Netlify CMS';
export const MERGE_COMMIT_MESSAGE = 'Automatically generated. Merged on Netlify CMS.';

const DEFAULT_NETLIFY_CMS_LABEL_PREFIX = 'netlify-cms/';
const getLabelPrefix = (labelPrefix: string) => labelPrefix || DEFAULT_NETLIFY_CMS_LABEL_PREFIX;

export const isCMSLabel = (label: string, labelPrefix: string) =>
  label.startsWith(getLabelPrefix(labelPrefix));
export const labelToStatus = (label: string, labelPrefix: string) =>
  label.substr(getLabelPrefix(labelPrefix).length);
export const statusToLabel = (status: string, labelPrefix: string) =>
  `${getLabelPrefix(labelPrefix)}${status}`;

export const generateContentKey = (collectionName: string, slug: string) =>
  `${collectionName}/${slug}`;

export const parseContentKey = (contentKey: string) => {
  const index = contentKey.indexOf('/');
  return { collection: contentKey.substr(0, index), slug: contentKey.substr(index + 1) };
};

export const contentKeyFromBranch = (branch: string) => {
  return branch.substring(`${CMS_BRANCH_PREFIX}/`.length);
};

export const branchFromContentKey = (contentKey: string) => {
  return `${CMS_BRANCH_PREFIX}/${contentKey}`;
};