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index.js
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index.js
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document.addEventListener('DOMContentLoaded', () => {
const ethers = window.ethers;
const $ = id => document.getElementById(id);
let provider, signer, contract;
const allNewsItems = [];
let isLoading = false, noMoreData = false, isSearchActive = false;
let lastTransactionParams = null;
const contractAddress = '0xD9157453E2668B2fc45b7A803D3FEF3642430cC0';
const contractABI = [
{"inputs":[{"name":"_queryId","type":"bytes32"},{"name":"_value","type":"bytes"},{"name":"_nonce","type":"uint256"},{"name":"_queryData","type":"bytes"}],"name":"submitValue","outputs":[],"stateMutability":"nonpayable","type":"function"},
{"inputs":[{"name":"_queryId","type":"bytes32"}],"name":"getNewValueCountbyQueryId","outputs":[{"name":"","type":"uint256"}],"stateMutability":"view","type":"function"}
];
const elements = {
newsFeed: $('newsFeed'),
loadMoreButton: $('loadMoreButton'),
loadingOverlay: $('loadingOverlay'),
reportContent: $('reportContent'),
searchInput: $('search-input'),
publishStory: $('publishStory'),
connectWallet: $('connectWallet'),
walletInfo: $('walletInfo'),
walletAddress: $('walletAddress'),
postButton: $('postButton'),
searchButton: $('search-button')
};
const showLoading = show => elements.loadingOverlay.style.display = show ? 'flex' : 'none';
const displayStatus = (message, isError = false) => {
console.log(isError ? `Error: ${message}` : message);
// Implement a more visible status display here if needed
};
const shortenAddress = address => {
if (typeof address !== 'string') return 'Unknown';
return address.length > 10 ? `${address.slice(0, 6)}...${address.slice(-4)}` : address;
};
const formatDate = timestamp => {
const date = new Date(timestamp);
return date.toLocaleString('en-US', {
month: 'numeric',
day: 'numeric',
year: 'numeric',
hour: 'numeric',
minute: 'numeric',
hour12: true
});
};
const decodeContent = (reportContentBytes) => {
try {
// Remove null bytes from the end
while (reportContentBytes.length > 0 && reportContentBytes[reportContentBytes.length - 1] === 0) {
reportContentBytes = reportContentBytes.slice(0, -1);
}
return ethers.utils.toUtf8String(reportContentBytes);
} catch (error) {
console.warn("Failed to decode content:", error);
// Attempt to decode as much as possible
return ethers.utils.toUtf8String(reportContentBytes.slice(0, error.offset), true);
}
};
const renderNews = (items, append = false) => {
if (!items.length && !append) {
elements.newsFeed.innerHTML = '<p>No news items to display.</p>';
return;
}
const fragment = document.createDocumentFragment();
items.forEach((item, index) => {
const article = document.createElement('article');
article.id = `news-item-${append ? allNewsItems.length + index : index}`;
article.className = 'news-item';
article.innerHTML = `
<div class="reporter-info">
<img src="newTRBphoto.jpg" alt="Reporter Avatar" class="avatar">
<div class="reporter-details">
<span class="reporter-name">${shortenAddress(item.reporter)}</span>
<span class="report-timestamp">· ${formatDate(item.timestamp)}</span>
</div>
</div>
<div class="report-content">
${item.content.split('\n\n').map(p => `<p>${p.replace(/\n/g, '<br>')}</p>`).join('')}
</div>
<div class="report-actions">
<button onclick="commentNews('${item.reporter}')">Comment</button>
<button onclick="likeNews('${item.reporter}')">Like</button>
<button onclick="disputeNews('${item.reporter}', '${item.queryId}', '${item.timestamp}')">Dispute</button>
<button onclick="voteNews('${item.reporter}')">Vote</button>
</div>
`;
fragment.appendChild(article);
});
if (!append) elements.newsFeed.innerHTML = '';
elements.newsFeed.appendChild(fragment);
elements.newsFeed.style.visibility = 'visible';
};
const connectWallet = async () => {
try {
if (typeof window.ethereum !== 'undefined') {
provider = new ethers.providers.Web3Provider(window.ethereum);
await provider.send("eth_requestAccounts", []);
signer = provider.getSigner();
const address = await signer.getAddress();
elements.connectWallet.style.display = 'none';
elements.walletInfo.style.display = 'block';
elements.walletAddress.textContent = shortenAddress(address);
elements.publishStory.disabled = false;
elements.reportContent.placeholder = "What's happening?";
contract = new ethers.Contract(contractAddress, contractABI, signer);
displayStatus('Wallet connected.');
} else {
throw new Error("Ethereum provider not found. Please install MetaMask.");
}
} catch (e) {
displayStatus('Could not connect to wallet: ' + e.message, true);
}
};
const loadNewsFeed = async (reset = false) => {
if (isLoading || (noMoreData && !reset)) return;
isLoading = true;
showLoading(true);
if (reset) {
allNewsItems.length = 0;
noMoreData = false;
lastTransactionParams = null;
elements.newsFeed.innerHTML = '';
}
const batchSize = 100; // Increased batch size
const minReportsToLoad = 10;
let newItems = [];
try {
while (newItems.length < minReportsToLoad && !noMoreData) {
const response = await fetch(`https://api.scan.pulsechain.com/api/v2/addresses/${contractAddress}/transactions?filter=to&sort=desc&limit=${batchSize}${lastTransactionParams ? '&' + new URLSearchParams(lastTransactionParams).toString() : ''}`);
const data = await response.json();
if (!data.items || data.items.length === 0) {
noMoreData = true;
break;
}
for (const tx of data.items) {
if (tx.method === 'submitValue' && tx.decoded_input?.parameters?.length >= 4) {
try {
const [queryType, reportContentBytes] = ethers.utils.defaultAbiCoder.decode(['string', 'bytes'], tx.decoded_input.parameters[3].value);
if (queryType === "StringQuery") {
const content = decodeContent(reportContentBytes);
if (content.trim()) {
newItems.push({
content: content,
reporter: tx.from.hash || tx.from,
timestamp: tx.timestamp || tx.block_timestamp,
queryId: tx.decoded_input.parameters[0].value
});
}
}
} catch (decodeError) {
console.warn("Failed to decode news item:", decodeError);
}
}
}
lastTransactionParams = data.next_page_params || null;
noMoreData = !lastTransactionParams;
}
if (newItems.length > 0) {
allNewsItems.push(...newItems);
renderNews(newItems, !reset);
displayStatus(`Loaded ${newItems.length} new items.`);
saveToLocalStorage();
} else {
displayStatus("No new items available.");
}
elements.loadMoreButton.style.display = noMoreData ? 'none' : 'block';
} catch (error) {
displayStatus('Error loading news feed: ' + error.message, true);
} finally {
isLoading = false;
showLoading(false);
}
};
const saveToLocalStorage = () => {
const itemsToSave = allNewsItems.slice(0, 50); // Save only the 50 most recent items
localStorage.setItem('newsItems', JSON.stringify(itemsToSave));
};
const loadFromLocalStorage = () => {
const savedItems = localStorage.getItem('newsItems');
if (savedItems) {
const parsedItems = JSON.parse(savedItems);
allNewsItems.push(...parsedItems);
renderNews(parsedItems);
displayStatus(`Loaded ${parsedItems.length} items from cache.`);
}
};
const submitStory = async () => {
const content = elements.reportContent.value.trim();
if (!content) return displayStatus('Please enter a story before submitting.', true);
elements.publishStory.disabled = true;
showLoading(true);
try {
if (!signer) throw new Error("Wallet not connected.");
const queryData = ethers.utils.defaultAbiCoder.encode(['string', 'bytes'], ["StringQuery", ethers.utils.toUtf8Bytes(content)]);
const queryId = ethers.utils.keccak256(queryData);
const nonce = await contract.getNewValueCountbyQueryId(queryId);
const value = ethers.utils.defaultAbiCoder.encode(['string', 'bytes'], ["NEWS", ethers.utils.toUtf8Bytes(content)]);
const gasEstimate = await contract.estimateGas.submitValue(queryId, value, nonce, queryData);
const tx = await contract.submitValue(queryId, value, nonce, queryData, { gasLimit: gasEstimate.mul(120).div(100) });
await tx.wait();
displayStatus("Story successfully submitted!");
elements.reportContent.value = '';
const newStory = {
content: content,
reporter: await signer.getAddress(),
timestamp: new Date().toISOString(),
queryId: queryId
};
allNewsItems.unshift(newStory);
renderNews([newStory], true);
saveToLocalStorage();
} catch (error) {
displayStatus('Error submitting story: ' + error.message, true);
} finally {
elements.publishStory.disabled = false;
showLoading(false);
}
};
const performSearch = () => {
const searchTerm = elements.searchInput.value.toLowerCase();
const filteredItems = allNewsItems.filter(item =>
shortenAddress(item.reporter).toLowerCase().includes(searchTerm) ||
item.content.toLowerCase().includes(searchTerm)
);
renderNews(filteredItems);
displayStatus(filteredItems.length ? `Found ${filteredItems.length} result(s).` : "No results found.");
isSearchActive = true;
elements.loadMoreButton.style.display = 'none';
};
const clearSearch = () => {
isSearchActive = false;
elements.searchInput.value = '';
renderNews(allNewsItems);
elements.loadMoreButton.style.display = 'block';
};
// Event Listeners
elements.connectWallet.addEventListener('click', connectWallet);
elements.publishStory.addEventListener('click', submitStory);
elements.searchInput.addEventListener('keypress', e => e.key === 'Enter' && performSearch());
elements.searchButton.addEventListener('click', performSearch);
elements.loadMoreButton.addEventListener('click', () => loadNewsFeed());
elements.postButton.addEventListener('click', () => elements.reportContent.focus());
elements.reportContent.addEventListener('input', function() {
this.style.height = 'auto';
this.style.height = this.scrollHeight + 'px';
});
// Global functions
window.commentNews = reporter => console.log(`Comment on news by reporter: ${shortenAddress(reporter)}`);
window.likeNews = reporter => console.log(`Like news by reporter: ${shortenAddress(reporter)}`);
window.voteNews = reporter => console.log(`Vote on news by reporter: ${shortenAddress(reporter)}`);
window.disputeNews = (reporter, queryId, timestamp) => {
console.log(`Dispute news by reporter: ${shortenAddress(reporter)}, QueryID: ${queryId}, Timestamp: ${timestamp}`);
};
// Initial load
loadFromLocalStorage();
loadNewsFeed();
});