# Description
#   Forwards messages to a pair.
#
# Dependencies
#
#
# Configuration
#
#
# Commands
#   pairbot start pairing with <user>
#   pairbot stop pairing
#   pairbot clear pairs
#   pairbot list pairs
#   pairbot help
#
# Notes
#   - 'start pairing' will clobber any previous pairing.
#
# Author:
#   fhwrdh@fhwrdh.net

_         = require 'underscore'
moment    = require 'moment'
stringify = JSON.stringify
metadata  = require('../package.json')

commands =
    start: [
        'spw'
        'pair with'
        'pairing with'
        'start pairing with'
        'start with'
        'start'
        'i\'m pairing with'
    ].join('|')
    stop: [
        'spw'
        'stop pairing'
        'done pairing'
        'end pairing'
        'not pairing'
        'stop'
        'done'
    ].join('|')
    list: [
        'list pairs'
        'list pairing'
        'list'
    ].join('|')
    clear: [
        'clear pairs'
        'clear pairing'
        'clear'
    ].join('|')
    about: [
        'about'
        'version'
        'tell .* about yourself'
        'who are you(\\?*)'
        'what are you(\\?*)'
    ].join('|')

START_PAIRING = ///(#{commands.start})\s+(.+)///i
STOP_PAIRING  = ///(#{commands.stop})$///i
LIST_PAIRS    = ///(#{commands.list})$///i
CLEAR_PAIRS   = ///(#{commands.clear})$///i
ABOUT         = ///(#{commands.about})$///i
HELP          = ///(\?|help)///i

getStorage = (robot) ->
    return JSON.parse(robot.brain.get 'pairbot') or {}

setStorage = (robot, data) ->
    robot.brain.set 'pairbot', stringify(data)

startPair = (robot, msg) ->
    data = getStorage robot
    user = msg.message.user.name
    pair = msg.match[2]

    if user == pair
        msg.reply "Pairing with yourself is considered harmful :)"
        return

    data[user] = { pair: pair, ts: moment.utc() }
    setStorage robot, data
    msg.reply "Got it, you are now pairing with #{pair}"

stopPair = (robot, msg) ->
    data = getStorage robot
    sender = msg.message.user.name

    # the sender could be on either side of the pairing
    # did it come from the principal?
    if data[sender]?
        foundPair = data[sender]
        principal = sender
        other = foundPair["pair"]
    else
        # iterate through all pairs, looking for the sender as the other
        foundPair = _.find _.pairs(data), (pair) ->
            return pair[1].pair == sender
        if foundPair?
            principal = foundPair[0]
            other = sender

    if not foundPair?
        msg.reply "Hmmm, didn't have you in the list"
    else
        delete data[principal]
        setStorage robot, data
        notSender = if principal == sender then other else principal
        msg.reply "Got it, you are done pairing with #{notSender}"

listPairs = (robot, msg) ->
    data = getStorage robot
    if not data or _.keys(data).length == 0
        msg.send "Looks like nobody is pairing right now? Weird."
    else
        count = _.keys(data).length
        msg.send "Listing #{count} pairs:"
        _.each data, (value, key) ->
            time = moment(value.ts).fromNow()
            msg.send "  #{key} pairing with #{value.pair} since #{time}"

clearPairs = (robot, msg) ->
    data = getStorage robot
    setStorage robot, {}
    msg.send "Ok, hope you know what you are doing. All pairs cleared."

sendAbout = (robot, msg) ->
    msg.send "#{robot.name} v#{metadata.version}"

sendHelp = (robot, msg) ->
    msg.send "Need help? I respond to the following commands (and a few aliases):"
    msg.send "  start pairing with <user>"
    msg.send "  stop pairing"
    msg.send "  list pairs"
    msg.send "  help"
    msg.send "  about"

handleError = (robot, error, msg) ->
    robot.logger.error "Error: #{error} / #{msg}"
    if msg?
        msg.reply "Ouch. that made me uncomfortable and I don't know why. Maybe a bug? You might file something to #{metadata.bugs.url}"

extras =
    Shell: 'testing'

getExtrasFor = (user) ->
    extra = extras[user]
    if extra?
        return " (#{extra})"
    ''

listen = (robot, msg) ->
    return if STOP_PAIRING.test msg.message
    return if START_PAIRING.test msg.message
    return if LIST_PAIRS.test msg.message
    return if CLEAR_PAIRS.test msg.message

    data = getStorage robot
    found = _.find _.keys(data), (key) ->
        return ///\b#{key}\b///.test msg.message.text
    return unless found

    pairing = data[found]

    # dont repeat the message is the pair is already mentioned
    pairMentioned = ///\b#{pairing.pair}\b///.test msg.message.text
    return if pairMentioned

    # don't repeat the message if sent from the pair
    sender = msg.message.user.name
    return if sender == pairing.pair

    extrasForFound = getExtrasFor found
    msg.send "#{pairing.pair}: ^^^^^ #{extrasForFound}"

module.exports = (robot) ->

    robot.respond HELP, (msg) ->
        sendHelp robot, msg

    robot.respond ABOUT, (msg) ->
        sendAbout robot, msg

    robot.respond START_PAIRING, (msg) ->
        startPair robot, msg

    robot.respond STOP_PAIRING, (msg) ->
        stopPair robot, msg

    robot.respond LIST_PAIRS, (msg) ->
        listPairs robot, msg

    robot.respond CLEAR_PAIRS, (msg) ->
        clearPairs robot, msg

    robot.respond /(.*)/, (msg) ->
        if msg.match[1] == ''
            sendHelp robot, msg

    robot.hear /(.*)/, (msg) ->
        listen robot, msg

    robot.error (error, msg) ->
        handleError robot, error, msg

    testHelper =
        testListen: listen
        testStartPair: startPair
        testStopPair: stopPair
    return testHelper