import 'dart:io';

import 'package:Envelope/models/text_messages.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

import '/components/custom_title_bar.dart';
import '/components/file_picker.dart';
import '/models/conversations.dart';
import '/models/messages.dart';
import '/models/my_profile.dart';
import '/utils/storage/messages.dart';
import '/utils/time.dart';
import '/views/main/conversation/settings.dart';

class ConversationDetail extends StatefulWidget{
  final Conversation conversation;
  const ConversationDetail({
    Key? key,
    required this.conversation,
  }) : super(key: key);

  @override
  _ConversationDetailState createState() => _ConversationDetailState();

}

class _ConversationDetailState extends State<ConversationDetail> {
  List<Message> messages = [];
  MyProfile profile = MyProfile(
    id: '',
    username: '',
    messageExpiryDefault: 'no_expiry',
  );

  TextEditingController msgController = TextEditingController();

  bool showFilePicker = false;
  List<File> selectedImages = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: CustomTitleBar(
        title: Text(
          widget.conversation.name,
          style: TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
            color: Theme.of(context).appBarTheme.toolbarTextStyle?.color
          ),
        ),
        showBack: true,
        rightHandButton: IconButton(
                  onPressed: (){
                    Navigator.of(context).push(
                      MaterialPageRoute(builder: (context) => ConversationSettings(
                          conversation: widget.conversation
                      )),
                    );
                  },
                  icon: Icon(
                    Icons.settings,
                    color: Theme.of(context).appBarTheme.iconTheme?.color,
                  ),
                ),
      ),

      body: Stack(
        children: <Widget>[
          messagesView(),
          newMessageContent(),
        ],
      ),
    );
  }

  Future<void> fetchMessages() async {
    profile = await MyProfile.getProfile();
    messages = await getMessagesForThread(widget.conversation);
    setState(() {});
  }

  @override
  void initState() {
    super.initState();
    fetchMessages();
  }

  Widget usernameOrFailedToSend(int index) {
    if (messages[index].senderUsername != profile.username) {
      return Text(
        messages[index].senderUsername,
        style: TextStyle(
          fontSize: 12,
          color: Colors.grey[300],
        ),
      );
    }

    if (messages[index].failedToSend) {
      return Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: const <Widget>[
          Icon(
            Icons.warning_rounded,
            color: Colors.red,
            size: 20,
          ),
          Text(
            'Failed to send',
            style: TextStyle(color: Colors.red, fontSize: 12),
            textAlign: TextAlign.right,
          ),
        ],
      );
    }

    return const SizedBox.shrink();
  }

  Widget messagesView() {
    if (messages.isEmpty) {
      return const Center(
        child: Text('No Messages'),
      );
    }

    return ListView.builder(
      itemCount: messages.length,
      shrinkWrap: true,
      padding: const EdgeInsets.only(top: 10,bottom: 90),
      reverse: true,
      itemBuilder: (context, index) {
        return Container(
          padding: const EdgeInsets.only(left: 14,right: 14,top: 0,bottom: 0),
          child: Align(
            alignment: (
            messages[index].senderUsername == profile.username ?
            Alignment.topRight :
            Alignment.topLeft
          ),
            child: Column(
              crossAxisAlignment: messages[index].senderUsername == profile.username ?
              CrossAxisAlignment.end :
              CrossAxisAlignment.start,
              children: <Widget>[
                Container(
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(20),
                    color: (
                    messages[index].senderUsername == profile.username ?
                    Theme.of(context).colorScheme.primary :
                    Theme.of(context).colorScheme.tertiary
                  ),
                  ),
                  padding: const EdgeInsets.all(12),
                  child: messageContent(index),
                ),
                const SizedBox(height: 1.5),
                Row(
                  mainAxisAlignment: messages[index].senderUsername == profile.username ?
                  MainAxisAlignment.end :
                  MainAxisAlignment.start,
                  children: <Widget>[
                    const SizedBox(width: 10),
                    usernameOrFailedToSend(index),
                  ],
                ),
                const SizedBox(height: 1.5),
                Row(
                  mainAxisAlignment: messages[index].senderUsername == profile.username ?
                  MainAxisAlignment.end :
                  MainAxisAlignment.start,
                  children: <Widget>[
                    const SizedBox(width: 10),
                    Text(
                      convertToAgo(messages[index].createdAt),
                      textAlign: messages[index].senderUsername == profile.username ?
                      TextAlign.left :
                      TextAlign.right,
                      style: TextStyle(
                        fontSize: 12,
                        color: Colors.grey[500],
                      ),
                    ),
                  ],
                ),
                index != 0 ?
                const SizedBox(height: 20) :
                const SizedBox.shrink(),
              ],
            )
          ),
        );
      },
    );
  }

  Widget messageContent(int index) {
    return Text(
      messages[index].getContent(),
      style: TextStyle(
        fontSize: 15,
        color: messages[index].senderUsername == profile.username ?
        Theme.of(context).colorScheme.onPrimary :
        Theme.of(context).colorScheme.onTertiary,
      )
    );
  }

  Widget showSelectedImages() {
    if (selectedImages.isEmpty) {
      return const SizedBox.shrink();
    }

    return SizedBox( 
      height: 80, 
      width: double.infinity, 
        child: ListView.builder(
        itemCount: selectedImages.length,
        shrinkWrap: true,
        scrollDirection: Axis.horizontal,
        padding: const EdgeInsets.all(5),
        itemBuilder: (context, i) {

          return Stack(
            children: [
              Column(
                children: [
                  const SizedBox(height: 5),
                  Container(
                    alignment: Alignment.center,
                    height: 65,
                    width: 65,
                    child: Image.file(
                      selectedImages[i],
                      fit: BoxFit.fill,
                    ),
                  ),
                ],
              ),

              SizedBox(
                height: 60,
                width: 70,
                child: Align(
                  alignment: Alignment.topRight,
                  child: GestureDetector(
                    onTap: () {
                      setState(() {
                        selectedImages.removeAt(i);
                      });
                    },
                    child: Container(
                      height: 20,
                      width: 20,
                      decoration: BoxDecoration(
                        color: Theme.of(context).colorScheme.onPrimary,
                        borderRadius: BorderRadius.circular(30),
                      ),
                      child: Icon(
                        Icons.cancel,
                        color: Theme.of(context).primaryColor,
                        size: 20
                      ),
                    ),
                  ),
                ),
              ),

            ],
          );
        },
      )
    );
  }

  Widget newMessageContent() {
    return Align(
    alignment: Alignment.bottomLeft,
    child: ConstrainedBox(
      constraints: BoxConstraints(
        maxHeight: selectedImages.isEmpty ?
          200.0 :
          270.0,
      ),
      child: Container(
        padding: const EdgeInsets.only(left: 10,bottom: 10,top: 10),
        width: double.infinity,
        color: Theme.of(context).backgroundColor,
        child: Column( 
          mainAxisSize: MainAxisSize.min,
          children: [

            showSelectedImages(),

            Row(
              children: <Widget>[

                GestureDetector(
                  onTap: (){
                    setState(() {
                      showFilePicker = !showFilePicker;
                    });
                  },
                  child: Container(
                    height: 30,
                    width: 30,
                    decoration: BoxDecoration(
                      color: Theme.of(context).primaryColor,
                      borderRadius: BorderRadius.circular(30),
                    ),
                    child: Icon(
                      Icons.add,
                      color: Theme.of(context).colorScheme.onPrimary,
                      size: 20
                    ),
                  ),
                ),

                const SizedBox(width: 15,),

                Expanded(
                  child: TextField(
                    decoration: InputDecoration(
                      hintText: 'Write message...',
                      hintStyle: TextStyle(
                        color: Theme.of(context).hintColor,
                      ),
                      border: InputBorder.none,
                    ),
                    maxLines: null,
                    controller: msgController,
                  ),
                ),

                const SizedBox(width: 15),

                SizedBox(
                  width: 45,
                  height: 45,
                    child: FittedBox(
                      child: FloatingActionButton(
                        onPressed: () async {
                          if (msgController.text == '' || selectedImages.isEmpty) {
                            return;
                          }
                          await sendMessage(
                            widget.conversation, 
                            data: msgController.text != '' ? msgController.text : null,
                            files: selectedImages,
                          );
                          messages = await getMessagesForThread(widget.conversation);
                          setState(() {});
                          msgController.text = '';
                        },
                        child: Icon(
                          Icons.send,
                          color: Theme.of(context).colorScheme.onPrimary,
                          size: 22
                        ),
                        backgroundColor: Theme.of(context).primaryColor,
                      ),
                    ),
                  ),
                  const SizedBox(width: 10),
                ],
              ),

              showFilePicker ? 
                  FilePicker(
                    cameraHandle: () {},
                    galleryHandleMultiple: (List<XFile> images) async {
                      for (var img in images) {
                        selectedImages.add(File(img.path));
                      }
                      setState(() {
                        showFilePicker = false;
                      });
                    },
                    fileHandle: () {},
                  ) : 
                  const SizedBox.shrink(),
            ],
          ),
        ),
      ),
    );
  }
}