import Joi from 'joi'
import moment from 'moment'
import { metric } from '../text-formatters.js'
import { downloadCount } from '../color-formatters.js'
import { nonNegativeInteger } from '../validators.js'
import { BaseJsonService } from '../index.js'

const schema = Joi.object({
  total: nonNegativeInteger,
}).required()

const intervalMap = {
  dd: {
    startDate: endDate => endDate,
    suffix: '/day',
  },
  dw: {
    // 6 days, since date range is inclusive,
    startDate: endDate => moment(endDate).subtract(6, 'days'),
    suffix: '/week',
  },
  dm: {
    startDate: endDate => moment(endDate).subtract(30, 'days'),
    suffix: '/month',
  },
  dt: {
    startDate: () => moment(0),
    suffix: '',
  },
}

export default class Sourceforge extends BaseJsonService {
  static category = 'downloads'

  static route = {
    base: 'sourceforge',
    pattern: ':interval(dt|dm|dw|dd)/:project/:folder*',
  }

  static examples = [
    {
      title: 'SourceForge',
      pattern: ':interval(dt|dm|dw|dd)/:project',
      namedParams: {
        interval: 'dm',
        project: 'sevenzip',
      },
      staticPreview: this.render({
        downloads: 215990,
        interval: 'dm',
      }),
    },
    {
      title: 'SourceForge',
      pattern: ':interval(dt|dm|dw|dd)/:project/:folder',
      namedParams: {
        interval: 'dm',
        project: 'arianne',
        folder: 'stendhal',
      },
      staticPreview: this.render({
        downloads: 550,
        interval: 'dm',
      }),
    },
  ]

  static defaultBadgeData = { label: 'sourceforge' }

  static render({ downloads, interval }) {
    return {
      label: 'downloads',
      message: `${metric(downloads)}${intervalMap[interval].suffix}`,
      color: downloadCount(downloads),
    }
  }

  async fetch({ interval, project, folder }) {
    const url = `https://sourceforge.net/projects/${project}/files/${
      folder ? `${folder}/` : ''
    }stats/json`
    // get yesterday since today is incomplete
    const endDate = moment().subtract(24, 'hours')
    const startDate = intervalMap[interval].startDate(endDate)
    const options = {
      qs: {
        start_date: startDate.format('YYYY-MM-DD'),
        end_date: endDate.format('YYYY-MM-DD'),
      },
    }

    return this._requestJson({
      schema,
      url,
      options,
      errorMessages: {
        404: 'project not found',
      },
    })
  }

  async handle({ interval, project, folder }) {
    const json = await this.fetch({ interval, project, folder })
    return this.constructor.render({ interval, downloads: json.total })
  }
}