diff --git a/lib/weiyiai.rb b/lib/weiyiai.rb
new file mode 100644
index 0000000..35b297c
--- /dev/null
+++ b/lib/weiyiai.rb
@@ -0,0 +1,30 @@
+require 'net/http'
+require_relative 'weiyiai/error/error'
+require_relative 'weiyiai/openai/client'
+require_relative 'weiyiai/slack/client'
+require_relative 'weiyiai/client'
+
+# USAGE
+# require "weiyiai"
+#
+# Slack.configure do |config|
+#   config.token = 'TOKEN'
+# end
+# @weiyiai = WeiyiAI::Client.new(
+#   openai_configs: {
+#     access_token: 'TOKEN',
+#     organization_id: 'ORG_ID'
+#   },
+#   slack_configs: {
+#     connection: Slack::Web::Client.new,
+#     realtime_connection: Slack::RealTime::Client.new,
+#     default_channel: '#project-acw'
+#   }
+# )
+# chat_res = @weiyiai.openai.chat(
+#   parameters: {
+#     messages: [{ role: 'user', content: 'Summarize this page: https://zh.wikipedia.org/zh-tw/ChatGPT' }]
+#   }
+# )
+# chat_res = @weiyiai.openai.completions(parameters: {prompt: "What is top 10 news today"})
+# @weiyiai.slack.listen
\ No newline at end of file
diff --git a/lib/weiyiai/client.rb b/lib/weiyiai/client.rb
new file mode 100644
index 0000000..2141d87
--- /dev/null
+++ b/lib/weiyiai/client.rb
@@ -0,0 +1,18 @@
+
+module WeiyiAI
+  class Client
+    attr_accessor :openai, :slack
+    def initialize(openai_configs: nil, slack_configs: nil, default_channel: nil)
+      @openai = WeiyiAI::OpenAI::Client.new(openai_configs)
+      @slack = WeiyiAI::Slack::Client.new(slack_configs)
+    end
+
+    def prompt
+      # @openai.chat
+    end
+    
+    def respond
+      # @slack.post
+    end
+  end
+end
diff --git a/lib/weiyiai/error/error.rb b/lib/weiyiai/error/error.rb
new file mode 100644
index 0000000..d616197
--- /dev/null
+++ b/lib/weiyiai/error/error.rb
@@ -0,0 +1,7 @@
+module WeiyiAI
+  module Error
+    class ConfigurationError < StandardError; end
+    class OpenAIError < StandardError; end
+    class SlackError < StandardError; end
+  end
+end
diff --git a/lib/weiyiai/openai/client.rb b/lib/weiyiai/openai/client.rb
new file mode 100644
index 0000000..2361aa3
--- /dev/null
+++ b/lib/weiyiai/openai/client.rb
@@ -0,0 +1,74 @@
+# curl https://api.openai.com/v1/models \
+#   -H "Authorization: Bearer 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"
+module WeiyiAI
+  module OpenAI
+    class Client
+      attr_writer :access_token, :organization_id
+      attr_reader :response
+
+      DEFAULT_API_VERSION = 'v1'.freeze
+      DEFAULT_URI_BASE = 'https://api.openai.com/'.freeze
+      DEFAULT_TIMEOUT = 120
+
+      def initialize(access_token: nil, organization_id: nil)
+        @access_token = access_token
+        @organization_id = organization_id
+      end
+
+      # chat_res = @weiyiai.openai.chat(parameters: {messages: [{role: "user", content: "Summarize this page: https://zh.wikipedia.org/zh-tw/ChatGPT"}]})
+      def chat(parameters: {})
+        default_parameters = { model: 'gpt-3.5-turbo' }
+
+        res = Net::HTTP.post(
+          URI("#{base_uri}/chat/completions"), 
+          JSON.generate(parameters.merge(default_parameters)),
+          headers
+        )
+
+        respond(method: "#{__method__}", response: res)
+      end
+
+      # chat_res = @weiyiai.openai.completions(parameters: {prompt: "Say this is a test"})
+      def completions(parameters: {})
+        default_parameters = { model: 'text-davinci-003' }
+        res = Net::HTTP.post(
+          URI("#{base_uri}/completions"), 
+          JSON.generate(parameters.merge(default_parameters)),
+          headers
+        )
+        respond(method: "#{__method__}", response: res)
+      end
+
+      private def base_uri
+        DEFAULT_URI_BASE + DEFAULT_API_VERSION
+      end
+
+      private def headers
+        {
+          'Content-Type' => 'application/json',
+          'Authorization' => "Bearer #{@access_token}",
+          'OpenAI-Organization' => @organization_id
+        }
+      end
+
+      private def respond(method: nil, response: nil)
+        case response
+        when Net::HTTPSuccess, Net::HTTPRedirection
+          serialize(method: method, response_body: JSON.parse(response.body))
+        else
+          raise WeiyiAI::Error::OpenAIError, "[#{response.code}] #{response.body}"
+        end
+      end
+
+      private def serialize(method: nil, response_body: nil)
+        @response = response_body
+        case method
+        when "chat"
+          @response['choices'].map { |h| h['message']['content'] }.join("\n")
+        when "completions"
+          @response['choices'].map { |h| h['text'] }.join("\n")
+        end
+      end
+    end
+  end
+end
diff --git a/lib/weiyiai/slack/client.rb b/lib/weiyiai/slack/client.rb
new file mode 100644
index 0000000..bf8f8cb
--- /dev/null
+++ b/lib/weiyiai/slack/client.rb
@@ -0,0 +1,55 @@
+module WeiyiAI
+  module Slack
+    class Client
+      attr_accessor :connection, :realtime_connection
+      attr_reader :default_channel
+      def initialize(connection: nil, realtime_connection: nil, default_channel: nil)
+        @connection = connection
+        @realtime_connection = realtime_connection
+        @default_channel = default_channel
+      end
+
+      def post
+        @connection.chat_postMessage(
+          channel: @channel,
+          as_user: true,
+          mrkdwn: true,
+          blocks: [
+            {
+              "type": 'section',
+              "text": {
+                "type": 'mrkdwn',
+                "text": result.gsub('**', '*')
+              }
+            }
+          ]
+        )
+      end
+
+      def listen
+        @realtime_connection.on :hello do
+          puts "Successfully connected, welcome '#{client.self.name}' to the '#{client.team.name}' team at https://#{client.team.domain}.slack.com."
+        end
+
+        @realtime_connection.on :message do |data|
+          case data.text
+          when 'bot hi'
+            @realtime_connection.message(channel: data.channel, text: "Hi <@#{data.user}>!")
+          when /^bot/
+            @realtime_connection.message(channel: data.channel, text: "Sorry <@#{data.user}>, what?")
+          end
+        end
+
+        @realtime_connection.on :close do |_data|
+          puts 'Client is about to disconnect'
+        end
+
+        @realtime_connection.on :closed do |_data|
+          puts 'Client has disconnected successfully!'
+        end
+
+        @realtime_connection.start!
+      end
+    end
+  end
+end