From ad1beafeb3e59df8fb759fd89fcdbfc7b2cfef4f Mon Sep 17 00:00:00 2001
From: bodqhrohro <bodqhrohro@gmail.com>
Date: Sun, 8 Dec 2019 18:19:35 +0200
Subject: [PATCH] Add /history command

---
 telegram/commands.go | 64 +++++++++++++++++++++++++++++---------------
 1 file changed, 43 insertions(+), 21 deletions(-)

diff --git a/telegram/commands.go b/telegram/commands.go
index f4e0c62..12bf187 100644
--- a/telegram/commands.go
+++ b/telegram/commands.go
@@ -40,15 +40,15 @@ var chatCommands = map[string]command{
 	"channel":    command{"title description", "create new channel «title» with «description»"},
 	"secret":     command{"", "create secretchat with current user"},
 	"search":     command{"string [limit]", "search <string> in current chat"},
-	//"history":    command{"[limit]", "get last [limit] messages from current chat"},
-	"block":   command{"", "blacklist current user"},
-	"unblock": command{"", "unblacklist current user"},
-	"invite":  command{"id or @username", "add user to current chat"},
-	"kick":    command{"id or @username", "remove user to current chat"},
-	"ban":     command{"id or @username [hours]", "restrict @username from current chat for [hours] or forever"},
-	"leave":   command{"", "leave current chat"},
-	"close":   command{"", "close current secret chat"},
-	"delete":  command{"", "delete current chat from chat list"},
+	"history":    command{"[limit]", "get last [limit] messages from current chat"},
+	"block":      command{"", "blacklist current user"},
+	"unblock":    command{"", "unblacklist current user"},
+	"invite":     command{"id or @username", "add user to current chat"},
+	"kick":       command{"id or @username", "remove user to current chat"},
+	"ban":        command{"id or @username [hours]", "restrict @username from current chat for [hours] or forever"},
+	"leave":      command{"", "leave current chat"},
+	"close":      command{"", "close current secret chat"},
+	"delete":     command{"", "delete current chat from chat list"},
 	//"members":    command{"[query]", "search members [by optional query] in current chat (requires admin rights)"},
 }
 
@@ -122,6 +122,17 @@ func (c *Client) unsubscribe(chatID int64) {
 	)
 }
 
+func (c *Client) sendMessagesReverse(chatID int64, messages []*client.Message) {
+	for i := len(messages) - 1; i >= 0; i-- {
+		gateway.SendMessage(
+			c.jid,
+			strconv.FormatInt(chatID, 10),
+			c.formatMessage(0, 0, false, messages[i]),
+			c.xmpp,
+		)
+	}
+}
+
 func (c *Client) usernameOrIdToId(username string) (int32, error) {
 	userID, err := strconv.ParseInt(username, 10, 32)
 	// couldn't parse the id, try to lookup as a username
@@ -599,24 +610,35 @@ func (c *Client) ProcessChatCommand(chatID int64, cmdline string) (string, bool)
 		}
 
 		messages, err := c.client.SearchChatMessages(&client.SearchChatMessagesRequest{
-			ChatId:       chatID,
-			Query:        query,
-			Limit:        limit,
-			SenderUserId: c.me.Id,
-			Filter:       &client.SearchMessagesFilterEmpty{},
+			ChatId: chatID,
+			Query:  query,
+			Limit:  limit,
+			Filter: &client.SearchMessagesFilterEmpty{},
 		})
 		if err != nil {
 			return err.Error(), true
 		}
 
-		for i := len(messages.Messages) - 1; i >= 0; i-- {
-			gateway.SendMessage(
-				c.jid,
-				strconv.FormatInt(chatID, 10),
-				c.formatMessage(0, 0, false, messages.Messages[i]),
-				c.xmpp,
-			)
+		c.sendMessagesReverse(chatID, messages.Messages)
+	// get latest entries from history
+	case "history":
+		var limit int32 = 10
+		if len(args) > 0 {
+			newLimit, err := strconv.ParseInt(args[0], 10, 32)
+			if err == nil {
+				limit = int32(newLimit)
+			}
 		}
+
+		messages, err := c.client.GetChatHistory(&client.GetChatHistoryRequest{
+			ChatId: chatID,
+			Limit:  limit,
+		})
+		if err != nil {
+			return err.Error(), true
+		}
+
+		c.sendMessagesReverse(chatID, messages.Messages)
 	case "help":
 		return helpString(helpTypeChat), true
 	default: