# Description:
#   Show open pull requests from a Github repository
#
# Dependencies:
#   "githubot": "0.2.0"
#
# Configuration:
#   HUBOT_GITHUB_TOKEN
#   HUBOT_GITHUB_USER
#   HUBOT_GITHUB_API
#
# Commands:
#   HUBOT_GITHUB_USER is optional, but if you set it, you can ask `show me hubot pulls`
#   instead of `show me github/hubot pulls`.
#
#   HUBOT_GITHUB_API allows you to set a custom URL path (for Github enterprise users)
#
#   hubot show me <user/repo> pulls [with <regular expression>] - Shows open pull requests for that project by filtering pull request's title.
#
#   You can further filter pull request title by providing a reguar expression.
#   For example, `show me hubot pulls with awesome fix`.
#
# Author:
#   jingweno

module.exports = (robot) ->
  github = require("githubot")(robot)
  robot.respond /show\s+(me\s+)?(.*)\s+pulls(\s+with\s+)?(.*)?/i, (msg)->
    repo = github.qualified_repo msg.match[2]
    filter_reg_exp = new RegExp(msg.match[4], "i") if msg.match[3]
    unless (url_api_base = process.env.HUBOT_GITHUB_API)?
        url_api_base = "https://api.github.com"

    github.get "#{url_api_base}/repos/#{repo}/pulls", (pulls) ->
      if pulls.length == 0
          msg.send "Achievement unlocked: open pull requests zero!"
      else
        filtered_result = []
        for pull in pulls
          if filter_reg_exp && pull.title.search(filter_reg_exp) < 0
            continue
          filtered_result.push(pull)

        if filtered_result.length == 0
          summary = "no open pull request is found"
        else if filtered_result.length == 1
          summary = "1 open pull request is found:"
        else
          summary = "#{filtered_result.length} open pull requests are found:"

        msg.send summary

        for pull in filtered_result
          msg.send "\t#{pull.title} - #{pull.user.login}: #{pull.html_url}"