iu9-ca-web-chat/assets/js/chat.js

let currentHistoryId = 0;
    let currentChatID = null;

    document.addEventListener("DOMContentLoaded", async function() {
        currentChatID = await getChatID();
    });

    async function sendMessage() {
        const chatMessages = document.getElementById('chat-messages');
        const chatInput = document.getElementById('chat-input');
        const message = chatInput.value;

        if (message.trim() !== '') {
            const request = {
                'chatId': currentChatID,
                'LocalHistoryId': currentHistoryId,
                'content': {
                    'text': message
                }
            };

            const response = await fetch("/internalapi/sendMessage", {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(request)
            });

            const res = await response.json();

            if (res.update) {
                const update = res.update[0]; 
                currentHistoryId = update.HistoryId;

                const messageElement = document.createElement('div');
                messageElement.classList.add('chat-message');

                const avatarElement = document.createElement('div');
                avatarElement.classList.add('avatar');

                const avatarImage = document.createElement('img');
                avatarImage.src = 'https://sun9-59.userapi.com/impg/t8GhZ7FkynVifY1FQCnaf31tGprbV_rfauZzgg/fSq4lyc6V0U.jpg?size=1280x1280&quality=96&sign=e3c309a125cb570d2e18465eba65f940&type=album';
                avatarElement.appendChild(avatarImage);

                const messageContentElement = document.createElement('div');
                messageContentElement.classList.add('message-content');

                const usernameElement = document.createElement('div');
                usernameElement.classList.add('username');
                usernameElement.textContent = await getUserName();

                const textElement = document.createElement('div');
                textElement.classList.add('text');
                textElement.textContent = message;

                messageContentElement.appendChild(usernameElement);
                messageContentElement.appendChild(textElement);

                messageElement.appendChild(avatarElement);
                messageElement.appendChild(messageContentElement);

                chatMessages.appendChild(messageElement);

                chatInput.value = '';
                chatMessages.scrollTop = chatMessages.scrollHeight;
            }
        }
    }

    document.getElementById('chat-input').addEventListener('keydown', function (event) {
        if (event.key === 'Enter') {
            sendMessage();
        }
    });

    async function getUserName() {
        const userID = await getUserID();
        const request = {
            "id": userID
        };

        const response = await fetch('/internalapi/getUserInfo', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(request)
        });

        const res = await response.json();
        return res.content.name;
    }

    async function getUserID() {
        const response = await fetch('/internalapi/mirror', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({})
        });

        const res = await response.json();
        return res.id;
    }

    async function getChatID() {
        const chatNickname = window.location.pathname.split('/').pop();
        const response = await fetch('/internalapi/getChatList', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({})
        });

        const res = await response.json();
        for (const chat of res.chats) {
            if (chat.content.nickname === chatNickname) {
                return chat.id;
            }
        }
        return -1;
    }

    async function editMessage(new_message) {
        const req = {
            'chatId': currentChatID,
            'LocalHistoryId': currentHistoryId,
            'id': getUserID(),
            'content': {
                'text': new_message
            }
        };
        const res = await fetch('/internalapi/editMessage', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(req)
        });

        const response = await res.json();
        if (response.update) {
            currentHistoryId = response.update[0].HistoryId;
        }
    }

function openMembersList() {
    document.getElementById("members-list").style.display = "block";
    document.getElementById("overlay").style.display = "flex";

}
function closeMembersList() {
    document.getElementById("members-list").style.display = "none";
    document.getElementById("overlay").style.display = "none";
}
document.getElementById('chat-input').addEventListener('keydown', function (event) {
    if (event.key === 'Enter') {
        sendMessage();
    }
});