Notes

import 'package:file_picker/_internal/file_picker_web.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:lab9/user.dart';
import 'package:file_picker/file_picker.dart';
import 'dart:typed_data';


class PostPage extends StatefulWidget {
@override
State<PostPage> createState() => _PostPageState();
}

class _PostPageState extends State<PostPage> {
final TextEditingController postCon = TextEditingController();
final TextEditingController imageUrlCon = TextEditingController();
Uint8List? imageByte;
String? imageName;
void pickImage() async{
final result = await FilePickerWeb.platform.pickFiles(type: FileType.image);
if(result != null && result.files.first.bytes != null){
setState(() {
imageByte = result.files.first.bytes;
imageName = result.files.first.name;
});
}
}

void postSome() async {
final user = FirebaseAuth.instance.currentUser;
final ref = FirebaseStorage.instance.ref().child('posts/$imageName');
await ref.putData(imageByte!);
final imageUrl = await ref.getDownloadURL();

if (user == null || postCon.text.trim().isEmpty) return;

final userData = await FirebaseFirestore.instance.collection('users').doc(user.uid).get();

await FirebaseFirestore.instance.collection('posts').add({
'postText': postCon.text.trim(),
'image': imageUrlCon.text.trim(),
'userName': userData['name'],
'userUid': user.uid,
'timestamp': Timestamp.now(),
});

postCon.clear();
imageUrlCon.clear();
}

@override
void dispose() {
postCon.dispose();
super.dispose();
}

@override
Widget build(BuildContext context) {
final currentUserUid = FirebaseAuth.instance.currentUser?.uid;

return Scaffold(
appBar: AppBar(
title: Text("Posts"),
actions: [
IconButton(
icon: Icon(Icons.account_circle),
onPressed: () {
Navigator.pushReplacement(
context,
MaterialPageRoute(builder: (_) => UserPage()),
);
},
)
],
),
body: Column(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
TextField(
controller: postCon,
decoration: InputDecoration(hintText: "Write something..."),
),
// TextField(
// controller: imageUrlCon,
// decoration: InputDecoration(hintText: "Paste image URL (optional)"),
// ),
ElevatedButton(
onPressed: pickImage,
child: Icon(Icons.image)
),
if (imageByte != null)Image.memory(imageByte !, height: 150,),


Row(
children: [
Spacer(),
IconButton(icon: Icon(Icons.send), onPressed: postSome),
],
),
],
),
),
Expanded(
child: StreamBuilder(
stream: FirebaseFirestore.instance
.collection('posts')
.orderBy('timestamp', descending: true)
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return Center(child: CircularProgressIndicator());
}
if (!snapshot.hasData || snapshot.data!.docs.isEmpty) {
return Center(child: Text("No posts found"));
}

final posts = snapshot.data!.docs;
return ListView.builder(
itemCount: posts.length,
itemBuilder: (context, index) {
final postData = posts[index].data() as Map;
postData.containsKey('postText');
final isMe = postData['userUid'] == currentUserUid;
final hasText = postData.containsKey('postText') && postData['postText'].toString().isNotEmpty;
final hasImage = postData.containsKey('image') && postData['image'].toString().isNotEmpty;
final timestamp = postData['timestamp'] as Timestamp?;
final dateTime = timestamp?.toDate();

return Container(
margin: EdgeInsets.symmetric(vertical: 6, horizontal: 10),
child: Align(
alignment: isMe ? Alignment.centerRight : Alignment.centerLeft,
child: Column(
crossAxisAlignment: isMe ? CrossAxisAlignment.end : CrossAxisAlignment.start,
children: [
Text(
'${postData['userName']} | $dateTime',
style: TextStyle(fontWeight: FontWeight.bold, color: Colors.grey[700]),
),
if (hasText)
Container(
margin: EdgeInsets.only(top: 4),
padding: EdgeInsets.all(12),
decoration: BoxDecoration(
color: isMe ? Colors.blue[100] : Colors.grey[300],
borderRadius: BorderRadius.circular(12),
),
child: Text(postData['postText']),
),
if (hasImage)
Container(
margin: EdgeInsets.only(top: 4),
padding: EdgeInsets.all(8),
decoration: BoxDecoration(
color: isMe ? Colors.blue[50] : Colors.grey[200],
borderRadius: BorderRadius.circular(12),
),
child: Image.network(postData['image']),
),
],
),
),
);
}
);
},
),
),
],
),
);
}
}