Init topic view

packages/concordia-app/src/views/Topic/TopicView/index.jsx

@@ -1,18 +1,135 @@
-import React from 'react';
+import React, { useEffect, useState } from 'react';
 import PropTypes from 'prop-types';
+import { useDispatch, useSelector } from 'react-redux';
+import {
+  Container, Dimmer, Icon, Loader, Placeholder, Step,
+} from 'semantic-ui-react';
+import moment from 'moment';
+import { breeze, drizzle } from '../../../redux/store';
+import { FETCH_USER_DATABASE } from '../../../redux/actions/peerDbReplicationActions';
+import './styles.css';
+
+const { contracts: { Forum: { methods: { getTopic: { cacheCall: getTopicChainData } } } } } = drizzle;
+const { orbit } = breeze;
 
 const TopicView = (props) => {
-  const { topicId } = props;
+  const {
+    topicId, topicAuthorAddress: initialTopicAuthorAddress, topicAuthor: initialTopicAuthor,
+    timestamp: initialTimestamp, postIds: initialPostIds,
+  } = props;
+  const drizzleInitialized = useSelector((state) => state.drizzleStatus.initialized);
+  const drizzleInitializationFailed = useSelector((state) => state.drizzleStatus.failed);
+  const userAddress = useSelector((state) => state.user.address);
+  const getTopicResults = useSelector((state) => state.contracts.Forum.getTopic);
+  const topics = useSelector((state) => state.orbitData.topics);
+  const [getTopicCallHash, setGetTopicCallHash] = useState([]);
+  const [topicAuthorAddress, setTopicAuthorAddress] = useState(initialTopicAuthorAddress || null);
+  const [topicAuthor, setTopicAuthor] = useState(initialTopicAuthor || null);
+  const [timestamp, setTimestamp] = useState(initialTimestamp || null);
+  const [postIds, setPostIds] = useState(initialPostIds || null);
+  const [topicSubject, setTopicSubject] = useState(null);
+
+  const dispatch = useDispatch();
+
+  useEffect(() => {
+    const shouldGetTopicDataFromChain = topicAuthorAddress === null
+        || topicAuthor === null
+        || timestamp === null
+        || postIds === null;
+
+    if (drizzleInitialized && !drizzleInitializationFailed && shouldGetTopicDataFromChain) {
+      setGetTopicCallHash(getTopicChainData(topicId));
+    }
+  }, [
+    drizzleInitializationFailed, drizzleInitialized, postIds, timestamp, topicAuthor, topicAuthorAddress, topicId,
+  ]);
+
+  useEffect(() => {
+    if (getTopicCallHash && getTopicResults && getTopicResults[getTopicCallHash]) {
+      setTopicAuthorAddress(getTopicResults[getTopicCallHash].value[0]);
+      setTopicAuthor(getTopicResults[getTopicCallHash].value[1]);
+      setTimestamp(getTopicResults[getTopicCallHash].value[2]);
+      setPostIds(getTopicResults[getTopicCallHash].value[3]);
+
+      const topicFound = topics
+        .find((topic) => topic.id === topicId);
+
+      if (topicFound === undefined && userAddress !== getTopicResults[getTopicCallHash].value[0]) {
+        dispatch({
+          type: FETCH_USER_DATABASE,
+          orbit,
+          userAddress: getTopicResults[getTopicCallHash].value[0],
+        });
+      }
+    }
+  }, [dispatch, getTopicCallHash, getTopicResults, topicId, topics, userAddress]);
+
+  useEffect(() => {
+    const topicFound = topics
+      .find((topic) => topic.id === topicId);
+
+    if (topicFound) {
+      setTopicSubject(topicFound.subject);
+    }
+  }, [topicId, topics]);
 
   return (
-      <div>
-          TODO
-      </div>
+      <Dimmer.Dimmable
+        as={Container}
+        id="topic-container"
+        blurring
+        dimmed={topicAuthorAddress === null && topicAuthor === null && timestamp === null}
+        textAlign="center"
+        className="list-item"
+      >
+          <Dimmer>
+              <Loader />
+          </Dimmer>
+          <Step.Group fluid>
+              <Step key="topic-header-step-user">
+                  <Icon name="user circle" size="big" inverted color="black" />
+                  <Step.Content>
+                      <Step.Title>
+                          {topicAuthor || (
+                              <Placeholder id="author-placeholder" inverted>
+                                  <Placeholder.Line length="full" />
+                              </Placeholder>
+                          )}
+                      </Step.Title>
+                  </Step.Content>
+              </Step>
+
+              <Step key="topic-header-step-title">
+                  <Step.Content>
+                      <Step.Title>
+                          {topicSubject || (
+                              <Placeholder id="subject-placeholder">
+                                  <Placeholder.Line length="full" />
+                              </Placeholder>
+                          )}
+                      </Step.Title>
+                      <Step.Description>
+                          {timestamp
+                            ? moment(timestamp * 1000).fromNow()
+                            : (
+                                <Placeholder id="date-placeholder">
+                                    <Placeholder.Line length="full" />
+                                </Placeholder>
+                            )}
+                      </Step.Description>
+                  </Step.Content>
+              </Step>
+          </Step.Group>
+      </Dimmer.Dimmable>
   );
 };
 
 TopicView.propTypes = {
   topicId: PropTypes.number.isRequired,
+  topicAuthorAddress: PropTypes.string,
+  topicAuthor: PropTypes.string,
+  timestamp: PropTypes.number,
+  postIds: PropTypes.arrayOf(PropTypes.number),
 };
 
 export default TopicView;

packages/concordia-app/src/views/Topic/TopicView/styles.css

@@ -0,0 +1,12 @@
+#author-placeholder {
+    width: 150px !important;
+}
+
+#subject-placeholder {
+    width: 250px !important;
+}
+
+#date-placeholder {
+    width: 150px !important;
+    margin: 0 auto;
+}