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

import '../i18n/strings.g.dart';
import '../services/profile_store.dart';
import '../services/social_service.dart';
import '../services/social_settings.dart';
import 'qr_view.dart';
import 'theme.dart';

/// Your own profile: the shareable identity (npub) plus a display name and short
/// "about" others see instead of a raw key. Saving persists locally and, when
/// online, publishes NIP-01 kind:0 metadata so peers can recognise you.
class ProfileScreen extends StatefulWidget {
  const ProfileScreen({
    required this.social,
    required this.settings,
    required this.profileStore,
    super.key,
  });

  final SocialService social;
  final SocialSettings settings;
  final ProfileStore profileStore;

  @override
  State<ProfileScreen> createState() => _ProfileScreenState();
}

class _ProfileScreenState extends State<ProfileScreen> {
  final _name = TextEditingController();
  final _about = TextEditingController();
  bool _loading = true;
  bool _saving = false;

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

  Future<void> _load() async {
    _name.text = await widget.profileStore.name();
    _about.text = await widget.profileStore.about();
    if (mounted) setState(() => _loading = false);
  }

  Future<void> _copyId() async {
    final messenger = ScaffoldMessenger.of(context);
    final t = context.t;
    await Clipboard.setData(ClipboardData(text: widget.social.npub));
    if (!mounted) return;
    messenger.showSnackBar(SnackBar(content: Text(t.profile.copied)));
  }

  Future<void> _save() async {
    final messenger = ScaffoldMessenger.of(context);
    final t = context.t;
    setState(() => _saving = true);
    await widget.profileStore.save(name: _name.text, about: _about.text);

    // Best-effort publish to the network so peers see the name.
    final relays = await widget.settings.relayUrls();
    if (relays.isNotEmpty) {
      try {
        final session = await widget.social.openSession(relays);
        await session.profile.publish(
          name: _name.text.trim(),
          about: _about.text.trim(),
        );
        await session.close();
      } catch (_) {
        // offline / unreachable — the local copy is saved regardless.
      }
    }
    if (!mounted) return;
    setState(() => _saving = false);
    messenger.showSnackBar(SnackBar(content: Text(t.profile.saved)));
  }

  @override
  void dispose() {
    _name.dispose();
    _about.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final t = context.t;
    return Scaffold(
      appBar: AppBar(title: Text(t.profile.title)),
      body: _loading
          ? const Center(child: CircularProgressIndicator())
          : ListView(
              padding: const EdgeInsets.all(20),
              children: [
                _IdentityCard(npub: widget.social.npub, onCopy: _copyId),
                const SizedBox(height: 24),
                TextField(
                  key: const Key('profile.name'),
                  controller: _name,
                  decoration: InputDecoration(
                    labelText: t.profile.name,
                    helperText: t.profile.nameHint,
                  ),
                ),
                const SizedBox(height: 16),
                TextField(
                  key: const Key('profile.about'),
                  controller: _about,
                  minLines: 2,
                  maxLines: 4,
                  decoration: InputDecoration(
                    labelText: t.profile.about,
                    helperText: t.profile.aboutHint,
                  ),
                ),
                const SizedBox(height: 24),
                FilledButton(
                  key: const Key('profile.save'),
                  onPressed: _saving ? null : _save,
                  child: _saving
                      ? const SizedBox(
                          height: 18,
                          width: 18,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : Text(t.profile.save),
                ),
              ],
            ),
    );
  }
}

class _IdentityCard extends StatelessWidget {
  const _IdentityCard({required this.npub, required this.onCopy});

  final String npub;
  final VoidCallback onCopy;

  @override
  Widget build(BuildContext context) {
    final t = context.t;
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: seedPrimaryContainer.withValues(alpha: 0.4),
        borderRadius: BorderRadius.circular(14),
        border: Border.all(color: seedOutline),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            t.profile.yourId,
            style: const TextStyle(
              fontWeight: FontWeight.w600,
              color: seedOnSurface,
            ),
          ),
          const SizedBox(height: 4),
          Text(
            t.profile.idHelp,
            style: const TextStyle(color: seedMuted, fontSize: 12),
          ),
          const SizedBox(height: 14),
          Center(child: QrView(data: npub, size: 200)),
          const SizedBox(height: 12),
          SelectableText(
            npub,
            style: const TextStyle(
              fontFamily: 'monospace',
              fontSize: 12,
              color: seedOnSurface,
            ),
          ),
          const SizedBox(height: 8),
          Align(
            alignment: AlignmentDirectional.centerEnd,
            child: TextButton.icon(
              key: const Key('profile.copyId'),
              onPressed: onCopy,
              icon: const Icon(Icons.copy, size: 16),
              label: Text(t.profile.copy),
            ),
          ),
        ],
      ),
    );
  }
}