From 3dac9c01aa08d33da0f35b0407fdc2b15113b4bc Mon Sep 17 00:00:00 2001
From: klmp200 <klmp200@klmp200.net>
Date: Tue, 24 Jul 2018 02:28:45 +0200
Subject: [PATCH] Add chat history

---
 alfred.go         | 10 +++++-
 settings.json     |  3 +-
 shared/history.go | 85 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+), 2 deletions(-)
 create mode 100644 shared/history.go

diff --git a/alfred.go b/alfred.go
index e84b9a3..80f866e 100644
--- a/alfred.go
+++ b/alfred.go
@@ -2,13 +2,14 @@
 * @Author: Bartuccio Antoine
 * @Date:   2018-07-23 15:24:22
 * @Last Modified by:   klmp200
-* @Last Modified time: 2018-07-23 19:14:10
+* @Last Modified time: 2018-07-24 02:25:26
  */
 
 package main
 
 import (
 	"./settings"
+	"./shared"
 	tb "gopkg.in/tucnak/telebot.v2"
 	"log"
 	"time"
@@ -19,6 +20,9 @@ func main() {
 		log.Fatal(err)
 	}
 
+	log.Println("Initialize history")
+	shared.InitHistory(int(settings.Settings["history size"].(float64)))
+
 	log.Println("Bot initialisation")
 	b, err := tb.NewBot(tb.Settings{
 		Token:  settings.Settings["token"].(string),
@@ -33,6 +37,10 @@ func main() {
 		b.Send(m.Chat, "Bonjour "+m.Sender.Username)
 	})
 
+	b.Handle(tb.OnText, func(m *tb.Message) {
+		shared.History.AddMessage(m.Chat.ID, m.Text)
+	})
+
 	log.Println("Starting bot")
 	b.Start()
 }
diff --git a/settings.json b/settings.json
index d691ca0..f6f81c4 100644
--- a/settings.json
+++ b/settings.json
@@ -1,3 +1,4 @@
 {
-	"token": "INSERT TOKEN HERE"
+	"token": "INSERT TOKEN HERE",
+	"history size": 10
 }
\ No newline at end of file
diff --git a/shared/history.go b/shared/history.go
new file mode 100644
index 0000000..0dc315e
--- /dev/null
+++ b/shared/history.go
@@ -0,0 +1,85 @@
+/*
+* @Author: Bartuccio Antoine
+* @Date:   2018-07-24 01:27:11
+* @Last Modified by:   klmp200
+* @Last Modified time: 2018-07-24 02:09:53
+ */
+
+package shared
+
+import (
+	"sync"
+)
+
+type history struct {
+	mutex sync.Mutex
+	size  int
+	data  map[int64][]string
+}
+
+var History history
+
+func InitHistory(size int) {
+	History = history{}
+	History.mutex.Lock()
+	defer History.mutex.Unlock()
+	History.size = size
+	History.data = make(map[int64][]string)
+}
+
+func (h history) Size() int {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+	return h.size
+}
+
+func (h history) Message(chatID int64, n int) string {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+	array, exists := h.data[chatID]
+	if exists && n >= 0 && n < len(array) {
+		return array[n]
+	}
+	return ""
+}
+
+func (h history) AddMessage(chatID int64, m string) {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+	if _, exists := h.data[chatID]; !exists {
+		h.data[chatID] = make([]string, h.size, h.size)
+	}
+	h.append(chatID, m)
+}
+
+func (h history) LastMessage(chatID int64) string {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+	if _, exists := h.data[chatID]; exists {
+		return h.data[chatID][h.size-1]
+	}
+	return ""
+}
+
+func (h history) ChatHistory(chatID int64) []string {
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+	array, exists := h.data[chatID]
+	if exists {
+		c := make([]string, h.size, h.size)
+		copy(c, array)
+		return c
+	}
+	return nil
+}
+
+// Assert that the slice exists and mutex already locked
+func (h history) append(chatID int64, m string) {
+	c := make([]string, h.size-1, h.size-1)
+	array, _ := h.data[chatID]
+	copy(c, array[1:])
+	for i, val := range c {
+		array[i] = val
+	}
+	array[h.size-1] = m
+}