import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:halkyon_app/l10n/halkyon_app_localizations.dart';
import 'package:halkyon_app/src/agent/widget/agents_section.dart';
import 'package:halkyon_app/src/app/app_scope.dart';
import 'package:halkyon_app/src/auth/bloc/sign_in_ways_cubit.dart';
import 'package:halkyon_app/src/password/widget/account_security_section.dart';
import 'package:halkyon_app/src/profile/widget/public_profile_section.dart';
import 'package:halkyon_app/src/simplelogin/widget/simplelogin_section.dart';
import 'package:halkyon_ui/halkyon_ui.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import 'package:material_ui/material_ui.dart';

/// Every Halkyon app's Profile (decided 2026-11-02, the developer's wish
/// for one profile in function and look across the apps): the person's
/// own tab first, the same in every app (their account and the ways they
/// sign in, SimpleLogin and the password with its authenticators, then the
/// app's own [sections], then the public profile others see, one for all
/// apps), and after it the app's own [tabs] (Learn's statistics, Train's
/// progress). With several tabs, the tab row folds into the title as the
/// content scrolls ([FoldingTabs], as Strava's); with none of the app's,
/// the person's tab alone, under the title. The [actions] stand in the app
/// bar (the app's Settings); the app's colour washes down from the top
/// ([TopGradient], [color], into [background]).
class const HalkyonProfile({
  final List<Widget> actions = const [],
  final List<Widget> sections = const [],
  final List<FoldingTab> tabs = const [],
  final Color? color,
  final Color? background,
  super.key,
}) extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final l10n = HalkyonAppLocalizations.of(context);
    final mine = _Mine(sections: sections);
    return BlocProvider(
      create: (context) => SignInWaysCubit(AppScope.of(context).auth)..load(),
      child: TopGradient(
        color: color,
        background: background ?? Theme.of(context).colorScheme.surface,
        child: tabs.isEmpty
            ? Scaffold(
                backgroundColor: Colors.transparent,
                appBar: AppBar(
                  backgroundColor: Colors.transparent,
                  systemOverlayStyle: TopGradient.overlayStyle(context),
                  title: Text(l10n.profileTitle),
                  actions: actions,
                ),
                body: mine,
              )
            : FoldingTabs(
                title: l10n.profileTitle,
                actions: actions,
                tabs: [
                  FoldingTab(label: l10n.profileTabProfile, body: mine),
                  ...tabs,
                ],
              ),
      ),
    );
  }
}

/// The person's own tab: a card for each part, as Settings groups its own,
/// in the middle and as wide as readable text.
class const _Mine({required final List<Widget> sections})
    extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final l10n = HalkyonAppLocalizations.of(context);
    return Center(
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: readableContentMaxWidth),
        child: ListView(
          // Room at the end for the navigation bar and its fade at the foot.
          padding: EdgeInsets.fromLTRB(
            12,
            12,
            12,
            12 + FlushNavigationBar.coverOf(context),
          ),
          children: [
            SectionCard(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  Text(
                    l10n.profileAccount,
                    style: Theme.of(context).textTheme.titleMedium,
                  ),
                  const SizedBox(height: 4),
                  Text(l10n.profileIdentified),
                  const _SignInWays(),
                ],
              ),
            ),
            for (final section in sections) ...[
              const SizedBox(height: 12),
              SectionCard(child: section),
            ],
            const SizedBox(height: 12),
            const SectionCard(child: PublicProfileSection()),
            // The person's agents (Halkyon's ADR 0044, D45), where the
            // instance offers them: a card of its own, or nothing.
            const AgentsSection(),
          ],
        ),
      ),
    );
  }
}

/// How the person signs in: an email address, and SimpleLogin (Halkyon
/// Learn's ADR 0020, D21), with the password and authenticators beneath.
class const _SignInWays() extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final l10n = HalkyonAppLocalizations.of(context);
    final theme = Theme.of(context);
    final ways = context.watch<SignInWaysCubit>().state;
    Widget way(String label, String linkedAs) => ListTile(
      contentPadding: EdgeInsets.zero,
      title: Text(label),
      subtitle: Text(linkedAs, maxLines: 1, overflow: TextOverflow.ellipsis),
      trailing: Icon(LucideIcons.circleCheck, color: theme.colorScheme.primary),
    );
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        const SizedBox(height: 16),
        Text(l10n.profileSignInWays, style: theme.textTheme.titleSmall),
        if (ways.ways.email)
          way(l10n.profileWayEmail, ways.emailAddress ?? l10n.profileWayLinked),
        // SimpleLogin (ADR 0020, D21): once added, one more way in here.
        const SimpleLoginSection(gapAbove: 16),
        const SizedBox(height: 16),
        // The password and authenticators, and setting them up (ADR 0017),
        // which brings the address.
        const AccountSecuritySection(),
      ],
    );
  }
}