text: 'use strict'
  
  const Joi = require('joi')
  const countBy = require('lodash.countby')
  const GithubAuthService = require('./github-auth-service')
  const { fetchIssue } = require('./github-common-fetch')
  const { documentation, errorMessagesFor } = require('./github-helpers')
  
  const schema = Joi.object({
    state: Joi.equal('failure', 'pending', 'success').required(),
    statuses: Joi.array()
      .items(
        Joi.object({
          state: Joi.equal('error', 'failure', 'pending', 'success').required(),
        })
      )
      .default([]),
  }).required()
  
  module.exports = class GithubPullRequestCheckState extends GithubAuthService {
    static get category() {
      return 'other'
    }
  
    static get route() {
      return {
        base: 'github/status',
        pattern: ':which(s|contexts)/pulls/:user/:repo/:number(\\d+)',
      }
    }
  
    static get examples() {
      return [
        {
          title: 'GitHub pull request check state',
          urlPattern: 's/pulls/:user/:repo/:number',
          staticExample: this.render({ which: 's', state: 'pending' }),
          exampleUrl: 's/pulls/badges/shields/1110',
          keywords: ['GitHub', 'pullrequest', 'detail', 'check'],
          documentation,
        },
        {
          title: 'GitHub pull request check contexts',
          urlPattern: 'contexts/pulls/:user/:repo/:number',
          staticExample: this.render({
            which: 'contexts',
            state: 'pending',
            stateCounts: { passed: 5, pending: 1 },
          }),
          exampleUrl: 'contexts/pulls/badges/shields/1110',
          keywords: ['GitHub', 'pullrequest', 'detail', 'check'],
          documentation,
        },
      ]
    }
  
    static get defaultBadgeData() {
      return {
        label: 'checks',
        logo: 'github',
      }
    }
  
    static render({ which, state, stateCounts }) {
      let message
      if (which === 'contexts') {
        message = Object.entries(stateCounts)
          .map(([state, count]) => `${count} ${state}`)
          .join(', ')
      } else {
        message = state
      }
  
      const color = {
        pending: 'dbab09',
        success: '2cbe4e',
        failure: 'cb2431',
      }[state]
  
      return { message, color }
    }
  
    static transform({ state, statuses }) {
      return {
        state,
        stateCounts: countBy(statuses, 'state'),
      }
    }
  
    async handle({ which, user, repo, number }) {
      const {
        head: { sha: ref },
      } = await fetchIssue(this, { user, repo, number })
  
      // https://developer.github.com/v3/repos/statuses/#get-the-combined-status-for-a-specific-ref
      const json = await this._requestJson({
        schema,
        url: `/repos/${user}/${repo}/commits/${ref}/status`,
        errorMessages: errorMessagesFor('commit not found'),
      })
      const { state, stateCounts } = this.constructor.transform(json)
  
      return this.constructor.render({ which, state, stateCounts })
    }
  }
  