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

import '../di/injector.dart' show switchSocialAccount;
import '../i18n/strings.g.dart';
import '../services/profile_cache.dart' show shortPubkey;
import '../services/social_account_store.dart';
import '../services/profile_store.dart';
import '../services/social_connection.dart';
import '../services/social_service.dart';
import 'avatar_edit.dart';
import 'peer_avatar.dart';
import 'qr_view.dart';
import 'restart_widget.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.connection,
    required this.profileStore,
    required this.accounts,
    this.yourPeopleEnabled = false,
    super.key,
  });

  final SocialService social;

  /// The shared relay connection, for publishing your profile.
  final SocialConnection connection;
  final ProfileStore profileStore;
  final SocialAccountStore accounts;

  /// Whether to offer the "Your people" entry (needs the social layer).
  final bool yourPeopleEnabled;

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

class _ProfileScreenState extends State<ProfileScreen> {
  final _name = TextEditingController();
  final _about = TextEditingController();
  final _g1 = TextEditingController();
  String _avatar = '';
  bool _loading = true;
  bool _saving = false;
  bool _switching = false;

  /// The identities of this root seed (account index + its npub), for the
  /// switcher. Always includes the active one.
  List<({int account, String npub})> _identities = const [];

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

  Future<void> _load() async {
    _name.text = await widget.profileStore.name();
    _about.text = await widget.profileStore.about();
    _g1.text = await widget.profileStore.g1();
    _avatar = await widget.profileStore.avatar();
    final max = await widget.accounts.maxCreated();
    final ids = <({int account, String npub})>[];
    for (var i = 0; i <= max; i++) {
      ids.add((account: i, npub: await widget.social.npubForAccount(i) ?? ''));
    }
    if (mounted) {
      setState(() {
        _identities = ids;
        _loading = false;
      });
    }
  }

  /// Switches to (or creates) an identity and rebuilds the app on the new one.
  Future<void> _switchTo(int account, {bool confirm = true}) async {
    if (account == widget.social.account || _switching) return;
    final t = context.t;
    if (confirm) {
      final ok = await showDialog<bool>(
        context: context,
        builder: (ctx) => AlertDialog(
          title: Text(t.profile.switchTitle),
          content: Text(t.profile.switchBody),
          actions: [
            TextButton(
                onPressed: () => Navigator.pop(ctx, false),
                child: Text(t.common.cancel)),
            FilledButton(
                onPressed: () => Navigator.pop(ctx, true),
                child: Text(t.profile.switchAction)),
          ],
        ),
      );
      if (ok != true) return;
    }
    if (!mounted) return;
    setState(() => _switching = true);
    await switchSocialAccount(account);
    if (mounted) RestartWidget.restart(context);
  }

  Future<void> _newIdentity() async {
    final next = await widget.accounts.maxCreated() + 1;
    await _switchTo(next, confirm: false); // creating one is already explicit
  }

  Future<void> _editAvatar() async {
    final result = await showAvatarPicker(context, current: _avatar);
    if (result == null || !mounted) return;
    setState(() => _avatar = result);
    // Persist + publish right away: an avatar change shouldn't depend on
    // finding the Save button further down the screen.
    await _save();
  }

  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, g1: _g1.text, avatar: _avatar);

    // Best-effort publish over the shared connection so peers see the name.
    try {
      final session = await widget.connection.session();
      await session?.profile.publish(
        name: _name.text.trim(),
        about: _about.text.trim(),
        picture: _avatar,
        g1: _g1.text.trim(),
      );
    } 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();
    _g1.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: [
                Center(
                  child: GestureDetector(
                    key: const Key('profile.avatar'),
                    onTap: _editAvatar,
                    child: Stack(
                      alignment: AlignmentDirectional.bottomEnd,
                      children: [
                        PeerAvatar(
                          pubkey: widget.social.publicKeyHex,
                          name: _name.text,
                          picture: _avatar,
                          radius: 44,
                        ),
                        Container(
                          padding: const EdgeInsets.all(5),
                          decoration: const BoxDecoration(
                            color: seedGreen,
                            shape: BoxShape.circle,
                          ),
                          child: const Icon(Icons.edit,
                              size: 15, color: Colors.white),
                        ),
                      ],
                    ),
                  ),
                ),
                const SizedBox(height: 20),
                _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: 16),
                TextField(
                  key: const Key('profile.g1'),
                  controller: _g1,
                  decoration: InputDecoration(
                    labelText: t.profile.g1,
                    helperText: t.profile.g1Hint,
                    helperMaxLines: 2,
                  ),
                ),
                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),
                ),
                const SizedBox(height: 28),
                const Divider(),
                const SizedBox(height: 12),
                _IdentitiesSection(
                  identities: _identities,
                  activeAccount: widget.social.account,
                  busy: _switching,
                  onSwitch: (a) => _switchTo(a),
                  onNew: _newIdentity,
                ),
                if (widget.yourPeopleEnabled) ...[
                  const SizedBox(height: 12),
                  const Divider(),
                  ListTile(
                    key: const Key('profile.yourPeople'),
                    contentPadding: EdgeInsets.zero,
                    leading:
                        const Icon(Icons.people_alt_outlined, color: seedGreen),
                    title: Text(t.yourPeople.title),
                    trailing: const Icon(Icons.chevron_right, color: seedMuted),
                    onTap: () => context.push('/your-people'),
                  ),
                ],
              ],
            ),
    );
  }
}

/// The identity switcher: every pseudonymous identity of this root seed, with
/// the active one marked, plus "new identity". Switching keeps chats/contacts
/// separate per identity; all regenerate from the single backup.
class _IdentitiesSection extends StatelessWidget {
  const _IdentitiesSection({
    required this.identities,
    required this.activeAccount,
    required this.busy,
    required this.onSwitch,
    required this.onNew,
  });

  final List<({int account, String npub})> identities;
  final int activeAccount;
  final bool busy;
  final ValueChanged<int> onSwitch;
  final VoidCallback onNew;

  @override
  Widget build(BuildContext context) {
    final t = context.t;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          t.profile.identities,
          style: const TextStyle(
              fontWeight: FontWeight.w600, color: seedOnSurface),
        ),
        const SizedBox(height: 4),
        Text(
          t.profile.identitiesHelp,
          style: const TextStyle(color: seedMuted, fontSize: 12),
        ),
        const SizedBox(height: 8),
        for (final id in identities)
          ListTile(
            contentPadding: EdgeInsets.zero,
            leading: Icon(
              id.account == activeAccount
                  ? Icons.radio_button_checked
                  : Icons.radio_button_unchecked,
              color: id.account == activeAccount ? seedGreen : seedMuted,
            ),
            title: Text(t.profile.identityLabel(n: id.account + 1)),
            subtitle: id.npub.isEmpty
                ? null
                : Text(shortPubkey(id.npub),
                    style: const TextStyle(
                        fontFamily: 'monospace', fontSize: 12)),
            trailing: id.account == activeAccount
                ? Text(t.profile.current,
                    style: const TextStyle(color: seedGreen, fontSize: 12))
                : null,
            onTap: busy || id.account == activeAccount
                ? null
                : () => onSwitch(id.account),
          ),
        const SizedBox(height: 4),
        Align(
          alignment: AlignmentDirectional.centerStart,
          child: TextButton.icon(
            key: const Key('profile.newIdentity'),
            onPressed: busy ? null : onNew,
            icon: const Icon(Icons.add, size: 18),
            label: Text(t.profile.newIdentity),
          ),
        ),
      ],
    );
  }
}

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),
            ),
          ),
        ],
      ),
    );
  }
}