import { last } from 'lodash';

export const IMPORT_STATE = {
  FAILED: 'failed',
  FINISHED: 'finished',
  NONE: 'none',
  SCHEDULED: 'scheduled',
  STARTED: 'started',
};

export const isInProgress = state =>
  state === IMPORT_STATE.SCHEDULED || state === IMPORT_STATE.STARTED;

export const isFinished = state => state === IMPORT_STATE.FINISHED;

/**
 * Calculates the label title for the most recent Jira import.
 *
 * @param {Object[]} jiraImports - List of Jira imports
 * @param {string} jiraImports[].jiraProjectKey - Jira project key
 * @returns {string} - A label title
 */
const calculateJiraImportLabelTitle = jiraImports => {
  const mostRecentJiraProjectKey = last(jiraImports)?.jiraProjectKey;
  const jiraProjectImportCount = jiraImports.filter(
    jiraImport => jiraImport.jiraProjectKey === mostRecentJiraProjectKey,
  ).length;
  return `jira-import::${mostRecentJiraProjectKey}-${jiraProjectImportCount}`;
};

/**
 * Finds the label color from a list of labels.
 *
 * @param {string} labelTitle - Label title
 * @param {Object[]} labels - List of labels
 * @param {string} labels[].title - Label title
 * @param {string} labels[].color - Label color
 * @returns {string} - The label color associated with the given labelTitle
 */
const calculateJiraImportLabelColor = (labelTitle, labels) =>
  labels.find(label => label.title === labelTitle)?.color;

/**
 * Calculates the label for the most recent Jira import.
 *
 * @param {Object[]} jiraImports - List of Jira imports
 * @param {string} jiraImports[].jiraProjectKey - Jira project key
 * @param {Object[]} labels - List of labels
 * @param {string} labels[].title - Label title
 * @param {string} labels[].color - Label color
 * @returns {{color: string, title: string}} - A label object containing a label color and title
 */
export const calculateJiraImportLabel = (jiraImports, labels) => {
  const title = calculateJiraImportLabelTitle(jiraImports);
  return {
    color: calculateJiraImportLabelColor(title, labels),
    title,
  };
};