msg.cr

require "json"

class FBMessage
  JSON.mapping(
    sender_name: String,
    timestamp_ms: Int32,
    content: {type: String, default: ""},
    type: String,
  )
end

class FBChat
  JSON.mapping(
    title: String,
    messages: Array(FBMessage),
  )
end

json = File.open("message.json")
chat = FBChat.from_json(json)

chat.messages.reverse.each do |msg|
  puts msg.sender_name
  puts msg.content
  exit
end