# class Sessions
class Sessions
  def initialize(request, response)
    @request = request
    @response = response
  end

  def signed_in?
    $active_users[self["user"]]
  end

  def logout
    uid = self["user"]
    $active_users.delete(uid)
    delete("user")
    DB["delete from SignedInUsers where code = ?", uid].delete
    true
  rescue Sequel::Error => e
    Logman.log "DB Error: #{e.message}"
    false
  end

  def login(username, pass)
    Logman.log "Logging in: #{username} & #{pass} #{ENV_HASH["SALT"]}"
    player = Players.authorized?(username, pass)
    if player
      code = Array.new(24) { ALPHANUM.sample }.join
      self["user"] = code
      $active_users[code] = username
      begin
        DB["insert into SignedInUsers (code, player) values (?, ?)", code, username].insert
      rescue Sequel::Error => e
        Logman.log "DB Error: #{e.message}"
        return [500, "Internal server error when signing you in!"]
      end
      return [200, "Remember to verify your email!"] unless Players.verified?(username)
      [200, "Signed in successfully!"]
    else
      [200, "Couldn't sign you in (Username or password incorrect)!"]
    end
  end

  # TODO: Use .all here
  def []=(key, val)
    session = @request.cookies["session"]
    session = session.nil? ? "{}" : Zlib::Inflate.inflate(Base64.decode64(session))
    session = JSON.parse(session)
    session[key] = val
    Logman.log "Updated: #{key} to #{val}"
    compressed = Zlib::Deflate.deflate(JSON.generate(session))
    encoded = Base64.encode64(compressed)
    @response.set_cookie("session",
                         value: encoded,
                         path: "/",
                         expires: Time.now + 360 * 24 * 60 * 60,
                         httponly: true,
                         secure: ENV_HASH["ENV"] == "prod",
                         samesite: :strict)
    uid = session["user"]
    DB["UPDATE SignedInUsers SET last_used_at = CURRENT_TIMESTAMP WHERE code = ?", uid].update if uid
  rescue JSON::ParserError, Zlib::Error
    @response.delete_cookie("session")
  rescue Sequel::Error => e
    Logman.log "DB Error: #{e.message} when updating last_used_at for #{uid}"
  end

  def [](key)
    session = @request.cookies["session"]
    session = session.nil? ? "{}" : Zlib::Inflate.inflate(Base64.decode64(session))
    session = JSON.parse(session)
    begin
      uid = session["user"]
      DB["UPDATE SignedInUsers SET last_used_at = CURRENT_TIMESTAMP WHERE code = ?", uid].update if uid
    rescue Sequel::Error => e
      Logman.log "DB Error: #{e.message} when updating last_used_at for #{uid}"
    end
    session[key]
  rescue JSON::ParserError, Zlib::Error
    @response.delete_cookie("session")
    ""
  end

  def message=(val)
    @response.set_cookie("message",
                         value: val,
                         path: "/",
                         expires: Time.now + 360 * 24 * 60 * 60,
                         secure: ENV_HASH["ENV"] == "prod",
                         samesite: :strict)
  end

  def message
    @request.cookies["message"]
  end

  def csrf_auth?
    @request.env["HTTP_X_CSRF_TOKEN"] == self["csrf_token"]
  end

  def all
    session = @request.cookies["session"]
    session = session.nil? ? "{}" : Zlib::Inflate.inflate(Base64.decode64(session))
    JSON.parse(session)
  rescue JSON::ParserError, Zlib::Error
    @response.delete_cookie("session")
    {}
  end

  def delete(key)
    session = @request.cookies["session"]
    session = session.nil? ? "{}" : Zlib::Inflate.inflate(Base64.decode64(session))
    session = JSON.parse(session)
    session.delete(key)
    Logman.log "Deleted: #{key}"
    Logman.log session.inspect
    compressed = Zlib::Deflate.deflate(JSON.generate(session))
    encoded = Base64.encode64(compressed)
    @response.set_cookie("session",
                         value: encoded,
                         path: "/",
                         expires: Time.now + 360 * 24 * 60 * 60,
                         httponly: true,
                         secure: ENV_HASH["ENV"] == "prod",
                         samesite: :strict)
  rescue JSON::ParserError, Zlib::Error
    @response.delete_cookie("session")
  end

  Thread.new do
    loop do
      now = Time.now
      fifteen_days_ago = now - (60 * 60 * 24 * 15)
      six_days_ago = now - (60 * 60 * 24 * 6)
      old_sessions = (DB[:SignedInUsers].where { created_at < fifteen_days_ago }.all +
                      DB[:SignedInUsers].where { last_used_at < six_days_ago }.all).uniq { |s| s[:code] }
      old_sessions.each do |session|
        begin
          DB[:SignedInUsers].where(code: session[:code]).delete
        rescue StandardError => e
          Logman.log "Thread DB error: #{e.message} on #{session[:code]} for #{session[:player]}"
        end
        $active_users.delete(session[:code])
        puts "Auto-logged out: #{session[:player]} (expired session)"
      end
    rescue StandardError => e
      Logman.log "Thread error: #{e.message}"
    ensure
      sleep 60 * 60 * 24
      Logman.log "Thread sleeping"
    end
  end
end