import 'package:commons_core/commons_core.dart';
import 'package:flutter/material.dart';

import '../i18n/strings.g.dart';
import '../services/social_connection.dart';
import '../services/social_settings.dart';
import 'theme.dart';

/// What a submitted report did, so the caller can react (hide the offer,
/// leave the chat when the person was also blocked).
typedef ReportOutcome = ({bool sent, bool blocked});

/// Opens the report sheet for a person (and optionally one of their offers,
/// via [offerAddress] `kind:pubkey:d`). Publishes a standard report to the
/// user's community servers and, when ticked, also blocks the person locally.
/// Returns null when dismissed without sending.
Future<ReportOutcome?> showReportSheet(
  BuildContext context, {
  required SocialConnection connection,
  required String subjectPubkey,
  String? offerAddress,
  SocialSettings? settings,
}) {
  return showModalBottomSheet<ReportOutcome>(
    context: context,
    isScrollControlled: true,
    builder: (_) => ReportSheet(
      connection: connection,
      subjectPubkey: subjectPubkey,
      offerAddress: offerAddress,
      settings: settings,
    ),
  );
}

/// The report form: what's wrong (mapped onto the standard report categories),
/// optional details, and an optional "also block" tick.
class ReportSheet extends StatefulWidget {
  const ReportSheet({
    required this.connection,
    required this.subjectPubkey,
    this.offerAddress,
    this.settings,
    super.key,
  });

  final SocialConnection connection;
  final String subjectPubkey;

  /// When reporting one offer (not just the person): its address.
  final String? offerAddress;

  /// Enables the "also block this person" option; null hides it.
  final SocialSettings? settings;

  @override
  State<ReportSheet> createState() => _ReportSheetState();
}

class _ReportSheetState extends State<ReportSheet> {
  ReportReason _reason = ReportReason.spam;
  bool _alsoBlock = false;
  bool _sending = false;
  final _details = TextEditingController();

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

  Future<void> _submit() async {
    final t = context.t;
    final messenger = ScaffoldMessenger.of(context);
    setState(() => _sending = true);
    try {
      final session = await widget.connection.session();
      if (session == null) throw StateError('offline');
      await session.reports.report(
        subjectPubkey: widget.subjectPubkey,
        eventAddress: widget.offerAddress,
        reason: _reason,
        details: _details.text.trim(),
      );
      var blocked = false;
      if (_alsoBlock && widget.settings != null) {
        await widget.settings!.block(widget.subjectPubkey);
        blocked = true;
      }
      if (!mounted) return;
      messenger
        ..hideCurrentSnackBar()
        ..showSnackBar(SnackBar(content: Text(t.report.sentHidden)));
      Navigator.of(context).pop((sent: true, blocked: blocked));
    } catch (_) {
      if (!mounted) return;
      setState(() => _sending = false);
      messenger
        ..hideCurrentSnackBar()
        ..showSnackBar(SnackBar(content: Text(t.report.failed)));
    }
  }

  @override
  Widget build(BuildContext context) {
    final t = context.t;
    final reasons = <(ReportReason, String)>[
      (ReportReason.spam, t.report.reasonSpam),
      (ReportReason.profanity, t.report.reasonAbuse),
      (ReportReason.illegal, t.report.reasonIllegal),
      (ReportReason.other, t.report.reasonOther),
    ];
    return SafeArea(
      child: SingleChildScrollView(
        padding: EdgeInsets.only(
          left: 20,
          right: 20,
          top: 20,
          bottom: 16 + MediaQuery.of(context).viewInsets.bottom,
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              t.report.title,
              style: Theme.of(context).textTheme.titleLarge?.copyWith(
                color: seedOnSurface,
                fontWeight: FontWeight.w600,
              ),
            ),
            const SizedBox(height: 4),
            Text(
              t.report.prompt,
              style: const TextStyle(color: seedMuted, fontSize: 13),
            ),
            const SizedBox(height: 4),
            RadioGroup<ReportReason>(
              groupValue: _reason,
              onChanged: _sending
                  ? (_) {}
                  : (v) => setState(() => _reason = v ?? _reason),
              child: Column(
                children: [
                  for (final (value, label) in reasons)
                    RadioListTile<ReportReason>(
                      value: value,
                      title: Text(label),
                      dense: true,
                      contentPadding: EdgeInsets.zero,
                    ),
                ],
              ),
            ),
            TextField(
              controller: _details,
              enabled: !_sending,
              minLines: 1,
              maxLines: 3,
              decoration: InputDecoration(hintText: t.report.detailsHint),
            ),
            if (widget.settings != null)
              CheckboxListTile(
                value: _alsoBlock,
                onChanged: _sending
                    ? null
                    : (v) => setState(() => _alsoBlock = v ?? false),
                title: Text(t.report.alsoBlock),
                dense: true,
                contentPadding: EdgeInsets.zero,
                controlAffinity: ListTileControlAffinity.leading,
              ),
            const SizedBox(height: 8),
            Align(
              alignment: AlignmentDirectional.centerEnd,
              child: FilledButton(
                key: const Key('report.send'),
                onPressed: _sending ? null : _submit,
                child: _sending
                    ? const SizedBox(
                        width: 16,
                        height: 16,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    : Text(t.report.send),
              ),
            ),
          ],
        ),
      ),
    );
  }
}