From 7834d345bff7a3b1a95a3ca31d0b45318e5a699c Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sun, 14 Apr 2019 22:22:49 -0700
Subject: [PATCH] Add multi-user and cron support.

---
 src/joann-pupper-bot.cr        | 165 ++++++++++++++++++++-------------
 src/joann-pupper-bot/reddit.cr |  13 ---
 2 files changed, 103 insertions(+), 75 deletions(-)

diff --git a/src/joann-pupper-bot.cr b/src/joann-pupper-bot.cr
index 035ae33..99ca654 100644
--- a/src/joann-pupper-bot.cr
+++ b/src/joann-pupper-bot.cr
@@ -5,70 +5,111 @@ require "time"
 require "sqlite3"
 require "cron_scheduler"
 
+
 # Chat IDs
-chatid_joann = 215301902
-chatid_daniel = 220888832
+CHATID_JOANN = 215301902_i64
+CHATID_DANIEL = 220888832_i64
+DATABASE_URL = "sqlite3://./data.sqlite"
+BOT_TOKEN = "599474797:AAEmjQNO32uqurI16blS9FT4OoO7GdUZ6h0"
+EXTENSIONS = ["png", "jpeg", "jpg"]
+LOGGER = Logger.new(STDOUT)
 
-# Configuration
-database = "sqlite3://./data.sqlite"
-subreddit = "rarepuppers"
-chatid = chatid_daniel
-delay = 1.hours
-active_hours = 7..24
-bot_token = "599474797:AAEmjQNO32uqurI16blS9FT4OoO7GdUZ6h0"
+class BotConfiguration
+  JSON.mapping(
+    subreddits: Array(String),
+    send_cron: String,
+    refresh_cron: String,
+    recepients: Array(Int64))
 
-# Setup
-completed = [] of String
-logger = Logger.new(STDOUT)
-bot = Telepathy::Bot.new bot_token
+  def initialize
+    @subreddits = [ "rarepuppers" ]
+    @send_cron = "00 8-21 * * *"
+    @refresh_cron = "*/15 * * * *"
+    @recepients = [ CHATID_DANIEL ]
+  end
+end
+
+class PupperBot
+   @db : DB::Database
+
+  def initialize(@configuration : BotConfiguration)
+    @telegram_bot = Telepathy::Bot.new BOT_TOKEN
+    @db = DB.open DATABASE_URL
+    initialize_db
+    update_database
+    initialize_timers
+    initialize_telegram
+    send_broadcast
+  end
+
+  def initialize
+    initialize BotConfiguration.new
+  end
+
+  private def initialize_db
+    @db.exec "create table if not exists posts(id integer primary key, title text, url text unique)"
+    @db.exec "create table if not exists recepient_posts(recepient integer, post integer, foreign key(post) references posts(id))"
+  end
+
+  private def initialize_timers
+    CronScheduler.define do
+      at(@configuration.send_cron) { send_broadcast }
+      at(@configuration.refresh_cron) { update_database }
+    end
+  end
+
+  private def initialize_telegram
+    @telegram_bot.command "ping" do |update, args|
+      @telegram_bot.send_message(update.message.as(Telepathy::Message).chat.id, "pong")
+    end
+
+    @telegram_bot.command "pupper" do |update, args|
+      command_chatid = update.message.as(Telepathy::Message).chat.id
+      send_single command_chatid
+    end
+
+    @telegram_bot.poll
+  end
+
+  def send_single(chatid)
+    unsent_query = "select id, title, url from posts where not exists (select * from recepient_posts where recepient=? and post=id) limit 1"
+
+    unless to_send = @db.query_one? unsent_query, chatid, as: { Int64, String, String }
+      LOGGER.info "Unable to find a post to send to #{chatid}."
+      return
+    end
+
+    id, title, url = to_send
+    LOGGER.info "Using URL #{url} for request from #{chatid}"
+    @db.exec "insert into recepient_posts(recepient, post) values(?, ?)", chatid, id
+    @telegram_bot.send_photo(chatid, url, title)
+  end
+
+  def send_broadcast
+    @configuration.recepients.each do |recepient|
+      send_single recepient
+    end
+  end
+
+  def update_database
+    unless response = RedditResponse.from_subreddits(@configuration.subreddits)
+      LOGGER.info "Unable to find more posts for the database"
+      return
+    end
+
+    posts = response.data.posts_matching { |post| EXTENSIONS.any? { |it| post.url.ends_with? it } }
+    posts.each do |post|
+      LOGGER.info "Trying to save post #{post.title} #{post.url}"
+      begin
+        @db.exec "insert into posts(title, url) values(?, ?)", post.title, post.url
+      rescue e
+        puts e
+      end
+    end
+  end
+end
+
+botc = PupperBot.new
 
 # Commands.
-bot.command "ping" do |update, args|
-    bot.send_message(update.message.as(Telepathy::Message).chat.id, "pong")
-end
-
-# Tasks
-def update_database(db)
-end
-
-bot.command "pupper" do |update, args|
-    url_tuple = get_reddit_post(subreddit, completed)
-    if url_tuple
-        url, title = url_tuple
-        command_chatid = update.message.as(Telepathy::Message).chat.id
-        logger.info "Using URL #{url} for request from #{command_chatid}"
-        bot.send_photo(command_chatid, url, title)
-    else
-        logger.error "Unable to find a post to send."
-    end
-end
-
-spawn do
-    loop do
-        time = Time.now
-        url_tuple = get_reddit_post(subreddit, completed) if (active_hours.includes? time.hour)
-        if url_tuple
-            url, title = url_tuple
-            logger.info "Sending regular picture to #{chatid}."
-            bot.send_photo(chatid.to_i64, url, title)
-        else
-            logger.error "Unable to find a post to send. (Or it's quiet hours)"
-        end
-        sleep delay
-    end
-end
-
-# Code to stop the bot on time.
-end_channel = Channel(Nil).new(1)
-
-bot.poll_end do
-    end_channel.send nil
-end
-
-Signal::INT.trap do
-    logger.info "Shutting down bot..."
-    bot.end_poll
-end
-
-bot.poll
-end_channel.receive
+sleep
diff --git a/src/joann-pupper-bot/reddit.cr b/src/joann-pupper-bot/reddit.cr
index 5141fc9..374dfb9 100644
--- a/src/joann-pupper-bot/reddit.cr
+++ b/src/joann-pupper-bot/reddit.cr
@@ -45,16 +45,3 @@ class RedditResponse
       .select { |it| yield it }
   end
 end
-
-def filter_reddit_json(json, completed, extensions = ["png", "jpeg"])
-  json.data.posts_matching do |post|
-    extensions.any? { |it| post.url.ends_with? it } && !completed.includes? post.url
-  end
-end
-
-def get_reddit_post(subreddit, completed)
-    return nil unless json = RedditResponse.from_subreddit subreddit
-    return nil unless post = filter_reddit_json(json, completed).first?
-    completed.push(post.name)
-    return { post.url, post.title }
-end