From 09fbdb2933f64a08aeca4df2204261b04ee38011 Mon Sep 17 00:00:00 2001
From: Pierre <pierre@hubert.fr>
Date: Thu, 26 Apr 2018 06:50:23 +0200
Subject: [PATCH] Can get and set oldest message ID known of a conversation

---
 .../components/conversations/chatWindows.js   | 47 ++++++++++++++++++-
 assets/js/components/conversations/service.js | 35 ++++++++++++++
 2 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/assets/js/components/conversations/chatWindows.js b/assets/js/components/conversations/chatWindows.js
index 77bb793b..30489053 100644
--- a/assets/js/components/conversations/chatWindows.js
+++ b/assets/js/components/conversations/chatWindows.js
@@ -831,7 +831,7 @@ ComunicWeb.components.conversations.chatWindows = {
 			element: textMessage,
 		});
 
-		//Enable slimscrool
+		//Enable slimscroll
 		$(convInfos.box.messagesArea).slimscroll({
 			height: "250px",
 		});
@@ -842,9 +842,54 @@ ComunicWeb.components.conversations.chatWindows = {
 			scrollTo: scrollBottom
 		});
 
+		//Initialize top scroll detection if required
+		this.initTopScrollDetection(conversationID);
+
 		//Success
 		return true;
 	},
+
+	/**
+	 * Init top scroll detection (if required)
+	 * 
+	 * @param {number} conversationID The ID of the target conversation
+	 */
+	initTopScrollDetection: function(conversationID){
+
+		//Extract conversation informations
+		var convInfo = this.__conversationsCache["conversation-"+conversationID];
+		
+		//Check if nothing has to be done
+		if(convInfo.box.initializedScrollDetection)
+			return;
+		
+		//Mark scroll detection as initialized
+		convInfo.box.initializedScrollDetection = true;
+
+		var scrollDetectionLocked = false;
+		var scrollTopCount = 0;
+		$(convInfo.box.messagesArea).slimScroll().bind("slimscrolling", function(e, pos){
+
+			if(scrollDetectionLocked)
+				return;
+
+			if(pos != 0){
+				scrollTopCount = 0;
+			}
+
+			scrollTopCount++;
+
+			//Check top count
+			if(scrollTopCount < 3)
+				return;
+			
+			//Lock the detection
+			scrollDetectionLocked = true;
+
+			//Fetch older messages
+			console.log("Fetch old messages");
+		});
+	}
 }
 
 //Register conversations cache cleaning function
diff --git a/assets/js/components/conversations/service.js b/assets/js/components/conversations/service.js
index 327355b8..eb6a3f7f 100644
--- a/assets/js/components/conversations/service.js
+++ b/assets/js/components/conversations/service.js
@@ -226,6 +226,41 @@ ComunicWeb.components.conversations.service = {
 		return true;
 	},
 
+	/**
+	 * Get the oldest messages of a conversation
+	 * 
+	 * @param {number} conversationID The ID of the target conversation
+	 * @return {numbert} The ID of the oldest message / -1 in case of failure
+	 */
+	getOldestMessageID: function(conversationID){
+
+		//Try to fetch information
+		if(this.__serviceCache){
+			if(this.__serviceCache['conversation-'+conversationID]){
+				return this.__serviceCache['conversation-'+conversationID].first_message_id;
+			}
+		}
+
+		//The conversation was not found
+		return -1;
+	},
+
+	/**
+	 * Set the oldest messages of a conversation
+	 * 
+	 * @param {number} conversationID The ID of the target conversation
+	 * @param {numbert} firstMessageID New value for the first known message id
+	 */
+	setOldestMessageID: function(conversationID, firstMessageID){
+
+		//Try to fetch information
+		if(this.__serviceCache){
+			if(this.__serviceCache['conversation-'+conversationID]){
+				this.__serviceCache['conversation-'+conversationID].first_message_id = firstMessageID;
+			}
+		}
+	},
+
 	/**
 	 * Empty service cache (unregister all conversations)
 	 *