import 'package:flutter/material.dart';
import 'package:flutter_widget_from_html_core/flutter_widget_from_html_core.dart';
import 'package:go_router/go_router.dart';
import 'package:logging/logging.dart';
import 'package:multi_trigger_autocomplete/multi_trigger_autocomplete.dart';
import 'package:provider/provider.dart';
import 'package:uuid/uuid.dart';

import '../controls/autocomplete/mention_autocomplete_options.dart';
import '../controls/entry_media_attachments/gallery_selector_control.dart';
import '../controls/entry_media_attachments/media_uploads_control.dart';
import '../controls/padding.dart';
import '../controls/timeline/status_header_control.dart';
import '../models/image_entry.dart';
import '../models/media_attachment_uploads/new_entry_media_items.dart';
import '../models/timeline_entry.dart';
import '../services/timeline_manager.dart';
import '../utils/snackbar_builder.dart';

class EditorScreen extends StatefulWidget {
  final String id;
  final String parentId;

  const EditorScreen({super.key, this.id = '', this.parentId = ''});

  @override
  State<EditorScreen> createState() => _EditorScreenState();
}

class _EditorScreenState extends State<EditorScreen> {
  static final _logger = Logger('$EditorScreen');
  final contentController = TextEditingController();
  final spoilerController = TextEditingController();
  final localEntryTemporaryId = const Uuid().v4();
  TimelineEntry? parentEntry;
  final newMediaItems = NewEntryMediaItems();
  final existingMediaItems = <ImageEntry>[];
  final focusNode = FocusNode();

  var isSubmitting = false;

  bool get isComment => widget.parentId.isNotEmpty;

  String get statusType => widget.parentId.isEmpty ? 'Post' : 'Comment';

  String get localEntryId =>
      widget.id.isNotEmpty ? widget.id : localEntryTemporaryId;

  @override
  void initState() {
    if (!isComment) {
      return;
    }

    final manager = context.read<TimelineManager>();
    manager.getEntryById(widget.parentId).match(onSuccess: (entry) {
      spoilerController.text = entry.spoilerText;
      parentEntry = entry;
    }, onError: (error) {
      _logger.finest('Error trying to get parent entry: $error');
    });
  }

  Future<void> createStatus(
      BuildContext context, TimelineManager manager) async {
    if (contentController.text.isEmpty) {
      buildSnackbar(context, "Can't submit an empty post/comment");
      return;
    }

    setState(() {
      isSubmitting = true;
    });

    final result = await manager.createNewStatus(
      contentController.text,
      spoilerText: spoilerController.text,
      inReplyToId: widget.parentId,
      newMediaItems: newMediaItems,
      existingMediaItems: existingMediaItems,
    );
    setState(() {
      isSubmitting = false;
    });

    if (result.isFailure) {
      buildSnackbar(context, 'Error posting: ${result.error}');
      return;
    }

    if (mounted && context.canPop()) {
      context.pop();
    }
  }

  @override
  Widget build(BuildContext context) {
    _logger.finest('Build editor $isComment $parentEntry');
    final manager = context.read<TimelineManager>();

    final mainBody = Padding(
      padding: const EdgeInsets.all(8.0),
      child: Container(
        child: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisAlignment: MainAxisAlignment.start,
            children: [
              if (isComment && parentEntry != null)
                buildCommentPreview(context, parentEntry!),
              TextFormField(
                readOnly: isSubmitting,
                enabled: !isSubmitting,
                controller: spoilerController,
                decoration: InputDecoration(
                  labelText: '$statusType Spoiler Text (optional)',
                  border: OutlineInputBorder(
                    borderSide: BorderSide(
                      color: Theme.of(context).backgroundColor,
                    ),
                    borderRadius: BorderRadius.circular(5.0),
                  ),
                ),
              ),
              const VerticalPadding(),
              buildContentField(context),
              const VerticalPadding(),
              GallerySelectorControl(entries: existingMediaItems),
              const VerticalPadding(),
              MediaUploadsControl(
                entryMediaItems: newMediaItems,
              ),
              buildButtonBar(context, manager),
            ],
          ),
        ),
      ),
    );

    final submittingBody = Stack(
      children: [
        mainBody,
        Card(
          color: Theme.of(context).canvasColor.withOpacity(0.8),
          child: SizedBox(
            width: MediaQuery.of(context).size.width,
            height: MediaQuery.of(context).size.height,
            child: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const CircularProgressIndicator(),
                  const VerticalPadding(),
                  Text('Submitting New $statusType'),
                ],
              ),
            ),
          ),
        ),
      ],
    );

    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: false,
        title: Text(widget.id.isEmpty ? 'New $statusType' : 'Edit $statusType'),
      ),
      body: isSubmitting ? submittingBody : mainBody,
    );
  }

  Widget buildContentField(BuildContext context) {
    return MultiTriggerAutocomplete(
      textEditingController: contentController,
      focusNode: focusNode,
      optionsAlignment: OptionsAlignment.bottomEnd,
      autocompleteTriggers: [
        AutocompleteTrigger(
          trigger: '@',
          optionsViewBuilder: (context, autocompleteQuery, controller) {
            return MentionAutocompleteOptions(
              query: autocompleteQuery.query,
              onMentionUserTap: (user) {
                final autocomplete = MultiTriggerAutocomplete.of(context);
                return autocomplete.acceptAutocompleteOption(user.handle);
              },
            );
          },
        ),
      ],
      fieldViewBuilder: (context, controller, focusNode) => TextFormField(
        focusNode: focusNode,
        readOnly: isSubmitting,
        enabled: !isSubmitting,
        maxLines: 10,
        controller: controller,
        decoration: InputDecoration(
          labelText: '$statusType Content',
          alignLabelWithHint: true,
          border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Theme.of(context).backgroundColor,
            ),
            borderRadius: BorderRadius.circular(5.0),
          ),
        ),
      ),
    );
  }

  Widget buildCommentPreview(BuildContext context, TimelineEntry entry) {
    _logger.finest('Build preview');
    return Column(
      mainAxisAlignment: MainAxisAlignment.start,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          'Comment for status: ',
          style: Theme.of(context).textTheme.bodyLarge,
        ),
        Card(
          child: Padding(
            padding: const EdgeInsets.all(8.0),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.start,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                StatusHeaderControl(
                  entry: entry,
                  openRemote: false,
                  showOpenControl: false,
                ),
                const VerticalPadding(height: 3),
                if (entry.spoilerText.isNotEmpty) ...[
                  Text(
                    'Content Summary: ${entry.spoilerText}',
                    style: Theme.of(context).textTheme.bodyLarge,
                  ),
                  const VerticalPadding(height: 3)
                ],
                HtmlWidget(entry.body),
              ],
            ),
          ),
        ),
        const VerticalPadding(),
      ],
    );
  }

  Widget buildButtonBar(BuildContext context, TimelineManager manager) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        ElevatedButton(
          onPressed: isSubmitting ? null : () => createStatus(context, manager),
          child: const Text('Submit'),
        ),
        const HorizontalPadding(),
        ElevatedButton(
          onPressed: isSubmitting
              ? null
              : () {
                  context.pop();
                },
          child: const Text('Cancel'),
        ),
      ],
    );
  }
}