require 'yaml'
require 'discordrb'
require 'open-uri'
require 'fileutils'
require 'securerandom'
require 'net/http'
require 'json'
require 'youtube-dl.rb'
require 'sqlite3'

db = SQLite3::Database.open 'tankbot.db'

$settings = YAML.load(File.read "config.yaml")['settings']
bot = Discordrb::Commands::CommandBot.new token: $settings['token'], prefix: $settings['prefix']

def save_settings
  File.open("config.yaml", 'w') do |file|
    file.write(YAML.dump({'settings' => $settings}))
  end
end

bot.command(:reset) do |_event|
    _event.message.mentions.each do |user|
        user.on(_event.channel.server).nickname = nil
    end

    "Finished resetting"
end

bot.command(:reap, description: "Reaps images posted by the caller in the current channel.") do |_event, stop_id|
    next "No stop_id supplied" if stop_id == nil
    FileUtils::mkdir_p("/tmp/tankbot_images/")
    stop = false
    earliest_message_id = nil
    control_message = _event.send_message("Reaping images sent by #{_event.author.mention}. React to this message to stop.")
    until stop
        messages = _event.channel.history(100, earliest_message_id)
        messages.select{ |message| message.author === _event.author }.each do |message|
            puts "#{message.id}, #{stop_id}"
            if control_message.reactions? or message.id == stop_id
                stop = true
                break
            end
            message.attachments.select{ |attachment| attachment.image? }.each do |attachment|
                control_message.edit(control_message.content + "\nDownloading **#{attachment.filename}**... (#{message.timestamp.strftime("%F")})")
                open("/tmp/tankbot_images/#{attachment.id}-#{attachment.filename}", 'wb') do |file|
                    file << open(attachment.url).read
                end
            end
        end
        stop = messages.length < 100
        earliest_message_id = messages.last.id
    end
    filename = "#{SecureRandom.uuid}.tar.gz"
    `tar -czf /var/www/scr/#{filename} /tmp/tankbot_images`
    FileUtils::rm_rf("/tmp/tankbot_images")
    control_message.edit("https://scr.tankernn.eu/#{filename}")
end

bot.command(:neko, description: "Requests (sometimes lewd) nekos.") do |_event, keyword|
    url = "https://nekos.life/api/v2/img/"
    options = ["meow", "woof", "tickle", "feed", "poke", "slap", "avatar", "waifu",
               "lizard", "pat", "kiss", "neko", "cuddle", "fox_girl", "hug"]
    if options.include? keyword then
        response = JSON.parse(Net::HTTP.get(URI("#{url}#{keyword}")))
        "Here's your lewds!  °˖✧◝(⁰▿⁰)◜✧˖°\n#{response['url']}"
    else
        "No such tag. Please specify one of `#{options.join(", ")}`"
    end
end

bot.command(:lmgtfy, description: "Helps tech-illiterate people to enlightenment.") do |_event, *args|
    "http://lmgtfy.com/?s=d&q=#{args.join('+')}"
end

bot.command(:copypasta, description: "Cites the holy texts.") do |_event, keyword|
    pastafile = "copypastas.json"
    file = File.read pastafile
    pastas = JSON.parse file
    if pastas.include? keyword then
        pastas[keyword]
    else
        "No such pasta. Available pastas include `#{pastas.keys.join(", ")}`"
    end
end


class UserQueue
    def initialize(user)
        @user = user
        @songs = []
    end

    attr_accessor :user
    attr_accessor :songs
end

class FairQueue
    def initialize(voice_bot)
        @voice_bot = voice_bot
        @queues = []
        @now_playing = nil
    end

    def append(user, video)
        @queues.append UserQueue.new user unless @queues.any? { |queue| queue.user == user }
        @queues.select{ |queue| queue.user == user }.first.songs.append(video)
    end

    def queue
        queues = @queues.map{ |queue| queue.songs }
        target_length = queues.map{ |queue| queue.length }.max
        queues.map{ |queue| queue + (target_length - queue.length).times.collect{nil} }.transpose.flatten.compact
    end

    def play
        until @queues.empty?
            queue = @queues.shift
            @now_playing = queue.songs.shift
            # Rotate user to last place
            @queues.append queue unless queue.songs.empty?
            # Play song
            # song_log("Playing *#{video.title}*...")
            @voice_bot.play_file(@now_playing.filename)
        end
        @voice_bot.destroy
    end

    attr_accessor :now_playing
end

def format_title(video)
    total_seconds = video.information[:duration]
    seconds = total_seconds % 60
    minutes = (total_seconds / 60) % 60
    hours = total_seconds / (60 * 60)
    timestamp = format("%02d:%02d", minutes, seconds)
    timestamp = format("%02d:%s", hours, timestamp) if hours > 0
    "**#{video.information[:fulltitle]}** `[#{timestamp}]`"
end

fairqueues = Hash.new

youtube_dl_options = {
    default_search: 'ytsearch',
    format: 'bestaudio',
    output: 'cache/%(title)s-%(id)s.%(ext)s'
}

bot.command(:play, description: "Plays 'music' of your choosing in your voice channel.") do |_event, *query|
    voice_bot = _event.voice
    unless voice_bot then
        channel = _event.user.voice_channel
        next "You're not in any voice channel!" unless channel
        voice_bot = bot.voice_connect(channel)
        voice_bot.volume = $settings['volume']
        fairqueues[_event.server] = FairQueue.new(voice_bot)
    end

    video = YoutubeDL.download query.join(' '), youtube_dl_options

    fairqueue = fairqueues[_event.server]
    fairqueue.append(_event.user, video)

    if voice_bot.playing? then
        "Added #{format_title(video)} to the queue."
    else
        Thread.new{fairqueue.play}
        "Started playing #{format_title(video)}"
    end
end

bot.command(:skip, description: "Expresses your dislike of the currently playing 'music'.") do |_event|
    _event.voice.stop_playing
end

bot.command(:np, description: "Shows what 'music' is currently playing.") do |_event|
    queue = fairqueues[_event.server]
    next "Nothing is playing." unless _event.voice
    format_title(queue.now_playing)
end

bot.command(:stop, description: "Puts an end to your misery.") do |_event|
    if _event.voice
        _event.voice.destroy
        "Stopped playing."
    else
        "Nothing is playing."
    end
end

bot.command(:queue, description: "Lists the impending torture.") do |_event|
    queue = fairqueues[_event.server]
    next "Nothing is playing." unless queue
    next "The queue is empty." if queue.queue.empty?

    queue.queue.each_with_index.map{|video, i| "#{i + 1}. #{format_title(video)}"}.join("\n")
end

bot.command(:volume, description: "Sets the severity of currently playing 'music'.") do |_event, volume|
    next "Nothing is playing." unless _event.voice

    $settings['volume'] = _event.voice.volume = [volume.to_f, 1.5].min
    save_settings

    ""
end

bot.command(:give, description: "Give a user some Good Boy Points (GBP).") do |_event|
    receiver = _event.message.mentions[0]
    sender = _event.author
    next 'You cannot give GBP to yourself.' if sender.id == receiver.id
    result = db.query "SELECT remaining FROM gbp WHERE user_id=?", sender.id
    first_result = result.next
    if first_result
        remaining = first_result[0]
    else
        remaining = $settings['gbp_per_week']
        db.execute "INSERT INTO gbp VALUES (?, ?, ?)", sender.id, 0, $settings['gbp_per_week']
    end
    next 'No GBP left to give this week.' unless remaining > 0
    result = db.query "SELECT received FROM gbp WHERE user_id=?", receiver.id
    first_result = result.next
    if first_result
        received = first_result[0]
    else
        received = 0
        db.execute "INSERT INTO gbp VALUES (?, ?, ?)", receiver.id, 0, $settings['gbp_per_week']
    end
    db.execute "UPDATE gbp SET received = ? WHERE user_id = ?", received + 1, receiver.id
    db.execute "UPDATE gbp SET remaining = ? WHERE user_id = ?", remaining - 1, sender.id
    "#{sender.mention} gave 1 GBP to #{receiver.mention}."
end

bot.command(:leaderboard, description: "Show who's got the most Good Boy Points (GBP).") do |_event|
    results = db.query "SELECT user_id, received FROM gbp ORDER BY received DESC"
    "**Good Boy Points (GBP) Leaderboard**\n" + results.each_with_index.map{|row, i| "#{i + 1}. #{_event.server.member(row[0]).nick} - #{row[1]}"}.join("\n")
end

bot.voice_state_update() do |_event|
    user = _event.user
    channel = _event.channel
    if channel.id == $settings['naughty_corner']
        # Deduct GBP
        result = db.query "SELECT received FROM gbp WHERE user_id=?", user.id
        first_result = result.next
        if first_result
            received = first_result[0]
        else
            received = 0
            db.execute "INSERT INTO gbp VALUES (?, ?, ?)", receiver.id, 0, $settings['gbp_per_week']
        end
        next unless received > 0

        db.execute "UPDATE gbp SET received = ? WHERE user_id = ?", received - 1, user.id
    end
end

bot.run