import * as core from '@actions/core'
import * as fs from 'fs'
import retry = require('async-retry')
import semver = require('semver')

const NEXTFLOW_REPO = {owner: 'nextflow-io', repo: 'nextflow'}

async function all_nf_releases(ok) {
  return await ok.paginate(
    ok.rest.repos.listReleases,
    NEXTFLOW_REPO,
    response => response.data
  )
}

async function latest_stable_release_data(ok) {
  const {data: stable_release} = await ok.rest.repos.getLatestRelease(
    NEXTFLOW_REPO
  )

  return stable_release
}

export async function release_data(version, ok) {
  // Setup tag-based filtering
  let filter = r => {
    return semver.satisfies(r.tag_name, version, true)
  }

  // Check if the user passed a 'latest*' tag, and override filtering
  // accordingly
  if (version.includes('latest')) {
    if (version.includes('-everything')) {
      // No filtering
      filter = r => {
        return true
      }
    } else if (version.includes('-edge')) {
      filter = r => {
        return r.tag_name.endsWith('-edge')
      }
    } else {
      // This is special: passing 'latest' or 'latest-stable' allows us to use
      // the latest stable GitHub release direct from the API
      const stable_release = await latest_stable_release_data(ok)
      return stable_release
    }
  }

  // Get all the releases
  const all_releases = await all_nf_releases(ok)

  let matching_releases = all_releases.filter(filter)

  matching_releases.sort(function (x, y) {
    semver.compare(x.tag_name, y.tag_name, true)
  })

  return matching_releases[0]
}

export function nextflow_bin_url(release, get_all) {
  const release_assets = release.assets
  const all_asset = release_assets.filter(a => {
    return a.browser_download_url.endsWith('-all')
  })[0]
  const regular_asset = release_assets.filter(a => {
    return a.name == 'nextflow'
  })[0]

  const dl_asset = get_all ? all_asset : regular_asset

  return dl_asset.browser_download_url
}

export async function install_nextflow(url, version) {
  core.debug(`Downloading Nextflow from ${url}`)
  const nf_dl_path = await retry(
    async bail => {
      return await tc.downloadTool(url)
    },
    {
      onRetry: err => {
        core.debug(`Download of ${url} failed, trying again. Error ${err}`)
      }
    }
  )

  const temp_install_dir = fs.mkdtempSync(`nxf-${version}`)
  const nf_path = `${temp_install_dir}/nextflow`

  fs.renameSync(nf_dl_path, nf_path)
  fs.chmodSync(nf_path, '0711')

  return temp_install_dir
}