1 files changed, 145 insertions, 0 deletions
diff --git a/webui/src/bug/CommentForm.tsx b/webui/src/bug/CommentForm.tsx
new file mode 100644
index 00000000..3aa52b19
--- /dev/null
+++ b/webui/src/bug/CommentForm.tsx
@@ -0,0 +1,145 @@
+import Button from '@material-ui/core/Button';
+import Paper from '@material-ui/core/Paper';
+import Tab from '@material-ui/core/Tab';
+import Tabs from '@material-ui/core/Tabs';
+import TextField from '@material-ui/core/TextField';
+import { makeStyles, Theme } from '@material-ui/core/styles';
+import React, { useState, useRef } from 'react';
+
+import Content from '../Content';
+
+import { useAddCommentMutation } from './CommentForm.generated';
+import { TimelineDocument } from './TimelineQuery.generated';
+
+type StyleProps = { loading: boolean };
+const useStyles = makeStyles<Theme, StyleProps>(theme => ({
+  container: {
+    margin: theme.spacing(2, 0),
+    padding: theme.spacing(0, 2, 2, 2),
+  },
+  textarea: {},
+  tabContent: {
+    margin: theme.spacing(2, 0),
+  },
+  preview: {
+    borderBottom: `solid 3px ${theme.palette.grey['200']}`,
+    minHeight: '5rem',
+  },
+  actions: {
+    display: 'flex',
+    justifyContent: 'flex-end',
+  },
+}));
+
+type TabPanelProps = {
+  children: React.ReactNode;
+  value: number;
+  index: number;
+} & React.HTMLProps<HTMLDivElement>;
+function TabPanel({ children, value, index, ...props }: TabPanelProps) {
+  return (
+    <div
+      role="tabpanel"
+      hidden={value !== index}
+      id={`editor-tabpanel-${index}`}
+      aria-labelledby={`editor-tab-${index}`}
+      {...props}
+    >
+      {value === index && children}
+    </div>
+  );
+}
+
+const a11yProps = (index: number) => ({
+  id: `editor-tab-${index}`,
+  'aria-controls': `editor-tabpanel-${index}`,
+});
+
+type Props = {
+  bugId: string;
+};
+
+function CommentForm({ bugId }: Props) {
+  const [addComment, { loading }] = useAddCommentMutation();
+  const [input, setInput] = useState<string>('');
+  const [tab, setTab] = useState(0);
+  const classes = useStyles({ loading });
+  const form = useRef<HTMLFormElement>(null);
+
+  const submit = () => {
+    addComment({
+      variables: {
+        input: {
+          prefix: bugId,
+          message: input,
+        },
+      },
+      refetchQueries: [
+        // TODO: update the cache instead of refetching
+        {
+          query: TimelineDocument,
+          variables: {
+            id: bugId,
+            first: 100,
+          },
+        },
+      ],
+      awaitRefetchQueries: true,
+    }).then(() => setInput(''));
+  };
+
+  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
+    e.preventDefault();
+    submit();
+  };
+
+  const handleKeyDown = (e: React.KeyboardEvent<HTMLElement>) => {
+    // Submit on cmd/ctrl+enter
+    if ((e.metaKey || e.altKey) && e.keyCode === 13) {
+      submit();
+    }
+  };
+
+  return (
+    <Paper className={classes.container}>
+      <form onSubmit={handleSubmit} ref={form}>
+        <Tabs value={tab} onChange={(_, t) => setTab(t)}>
+          <Tab label="Write" {...a11yProps(0)} />
+          <Tab label="Preview" {...a11yProps(1)} />
+        </Tabs>
+        <div className={classes.tabContent}>
+          <TabPanel value={tab} index={0}>
+            <TextField
+              onKeyDown={handleKeyDown}
+              fullWidth
+              label="Comment"
+              placeholder="Leave a comment"
+              className={classes.textarea}
+              multiline
+              value={input}
+              variant="filled"
+              rows="4" // TODO: rowsMin support
+              onChange={(e: any) => setInput(e.target.value)}
+              disabled={loading}
+            />
+          </TabPanel>
+          <TabPanel value={tab} index={1} className={classes.preview}>
+            <Content markdown={input} />
+          </TabPanel>
+        </div>
+        <div className={classes.actions}>
+          <Button
+            variant="contained"
+            color="primary"
+            type="submit"
+            disabled={loading}
+          >
+            Comment
+          </Button>
+        </div>
+      </form>
+    </Paper>
+  );
+}
+
+export default CommentForm;