From ae0d38314eeca0f0b89ec0dd7a19825632727ca3 Mon Sep 17 00:00:00 2001
From: Maksim Sukharev <antreesy.web@gmail.com>
Date: Tue, 22 Aug 2023 10:55:24 +0200
Subject: [PATCH] add store action to clear all messages before
 'history_cleared'

Signed-off-by: Maksim Sukharev <antreesy.web@gmail.com>
---
 src/store/messagesStore.js | 44 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/src/store/messagesStore.js b/src/store/messagesStore.js
index 49e5c3b0680..8c38b187b69 100644
--- a/src/store/messagesStore.js
+++ b/src/store/messagesStore.js
@@ -366,6 +366,31 @@ const mutations = {
 		}
 	},
 
+	/**
+	 * Clears the messages entry from the store for the given conversation token
+	 * starting from defined id.
+	 *
+	 * @param {object} state current store state
+	 * @param {object} payload payload;
+	 * @param {string} payload.token the token of the conversation to be cleared;
+	 * @param {number} payload.id the id of the message to be the first one after clear;
+	 */
+	clearMessagesHistory(state, { token, id }) {
+		Vue.set(state.firstKnown, token, id)
+
+		if (state.visualLastReadMessageId[token] && state.visualLastReadMessageId[token] < id) {
+			Vue.set(state.visualLastReadMessageId, token, id)
+		}
+
+		if (state.messages[token]) {
+			for (const messageId of Object.keys(state.messages[token])) {
+				if (messageId < id) {
+					Vue.delete(state.messages[token], messageId)
+				}
+			}
+		}
+	},
+
 	// Increases reaction count for a particular reaction on a message
 	addReactionToMessage(state, { token, messageId, reaction }) {
 		if (!state.messages[token][messageId].reactions[reaction]) {
@@ -486,6 +511,13 @@ const actions = {
 			})
 		}
 
+		if (message.systemMessage === 'history_cleared') {
+			context.commit('clearMessagesHistory', {
+				token: message.token,
+				id: message.id,
+			})
+		}
+
 		// Filter out some system messages
 		if (message.systemMessage !== 'reaction'
 			&& message.systemMessage !== 'reaction_deleted'
@@ -673,6 +705,18 @@ const actions = {
 		context.commit('deleteMessages', token)
 	},
 
+	/**
+	 * Clear all messages before defined id from the store only.
+	 *
+	 * @param {object} context default store context;
+	 * @param {object} payload payload;
+	 * @param {string} payload.token the token of the conversation to be cleared;
+	 * @param {number} payload.id the id of the message to be the first one after clear;
+	 */
+	clearMessagesHistory(context, { token, id }) {
+		context.commit('clearMessagesHistory', { token, id })
+	},
+
 	/**
 	 * Clears the last read message marker by moving it to the last message
 	 * in the conversation.