// Description:
//   Script that listens to new bounty-bug labels on GitHub issues
//   and adds/removes card for the issues to/from the bounty-bug column on the 'Status SOB Swarm' project
//
// Dependencies:
//   github: "^13.1.0"
//   probot-config: "^0.1.0"
//
// Author:
//   PombeirP

const slackHelper = require('../lib/slack')
const gitHubHelpers = require('../lib/github-helpers')
const defaultConfig = require('../lib/config')

const getConfig = require('probot-config')

const botName = 'assign-to-bounty-bug-column'

module.exports = (robot) => {
  robot.on('issues.labeled', async context => {
    // Make sure we don't listen to our own messages
    if (context.isBot) { return }

    // A new issue was labeled
    await assignIssueToBountyBug(context, robot, true)
  })
  robot.on('issues.unlabeled', async context => {
    // Make sure we don't listen to our own messages
    if (context.isBot) { return }

    // An issue was unlabeled
    await assignIssueToBountyBug(context, robot, false)
  })
}

async function assignIssueToBountyBug (context, robot, assign) {
  const { github, payload } = context
  const repoInfo = { owner: payload.repository.owner.login, repo: payload.repository.name }
  const config = await getConfig(context, 'github-bot.yml', defaultConfig(robot, '.github/github-bot.yml'))
  const projectBoardConfig = config ? config['bounty-project-board'] : null

  if (!projectBoardConfig) {
    return
  }

  const watchedLabelName = projectBoardConfig['bounty-bug-label-name']
  if (payload.label.name !== watchedLabelName) {
    robot.log.debug(`${botName} - '${payload.label.name}' doesn't match watched '${watchedLabelName}' label. Ignoring`)
    return
  }

  robot.log(`${botName} - Handling labeling of #${payload.issue.number} with ${payload.label.name} on repo ${repoInfo.owner}/${repoInfo.repo}`)

  // Fetch bounty-bug column in project board
  const bountyBugColumnName = projectBoardConfig['bounty-bug-column-name']
  const project = await gitHubHelpers.getOrgProjectByName(github, robot, repoInfo.owner, projectBoardConfig.name, botName)
  const column = await gitHubHelpers.getProjectColumnByName(github, robot, project, bountyBugColumnName, botName)
  if (!column) {
    return
  }

  if (process.env.DRY_RUN) {
    if (assign) {
      robot.log.info(`${botName} - Would have created card for issue`, column.id, payload.issue.id)
    } else {
      robot.log.info(`${botName} - Would have deleted card for issue`, column.id, payload.issue.id)
    }
  } else {
    if (assign) {
      try {
        // Create project card for the issue in the bounty-bug column
        const ghcardPayload = await github.projects.createProjectCard({
          column_id: column.id,
          content_type: 'Issue',
          content_id: payload.issue.id
        })
        const ghcard = ghcardPayload.data

        robot.log(`${botName} - Created card: ${ghcard.url}`, ghcard.id)
      } catch (err) {
        robot.log.error(`${botName} - Couldn't create project card for the issue: ${err}`, column.id, payload.issue.id)
      }
    } else {
      try {
        const ghcard = await gitHubHelpers.getProjectCardForIssue(github, column.id, payload.issue.url)
        if (ghcard) {
          await github.projects.deleteProjectCard({id: ghcard.id})
          robot.log(`${botName} - Deleted card: ${ghcard.url}`, ghcard.id)
        }
      } catch (err) {
        robot.log.error(`${botName} - Couldn't delete project card for the issue: ${err}`, column.id, payload.issue.id)
      }
    }
  }

  const slackMessage = getSlackMessage(projectBoardConfig.name, bountyBugColumnName, payload, assign)
  if (slackMessage) {
    // Send message to Slack
    slackHelper.sendMessage(robot, config.slack.notification.room, slackMessage)
  }
}

function getSlackMessage (projectBoardName, bountyBugColumnName, payload, assign) {
  if (assign) {
    return `Assigned issue to ${bountyBugColumnName} in ${projectBoardName} project\n${payload.issue.html_url}`
  }

  return `Unassigned issue from ${bountyBugColumnName} in ${projectBoardName} project\n${payload.issue.html_url}`
}