import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:okane/screen.dart';
import 'package:okane/ui/pages/account/account.dart';
import 'package:okane/ui/pages/budgets/budget_details.dart';
import 'package:okane/ui/pages/budgets/budgets.dart';
import 'package:okane/ui/pages/template_list.dart';
import 'package:okane/ui/pages/transaction_details.dart';
import 'package:okane/ui/pages/transaction_list.dart';
import 'package:okane/ui/state/core.dart';
import 'package:okane/ui/widgets/account_indicator.dart';

enum OkanePage { accounts, transactions, beneficiaries, templates, budgets }

typedef OkanePageBuilder = Widget Function(bool);

class OkanePageItem {
  final OkanePage page;
  final IconData icon;
  final String label;
  final Widget child;
  final OkanePageBuilder? details;
  final bool showAccountName;

  const OkanePageItem(
    this.page,
    this.icon,
    this.label,
    this.child,
    this.details,
    this.showAccountName,
  );

  bool _isEnabled(int? accountIndex) {
    if (showAccountName) {
      return accountIndex != null;
    }

    return true;
  }

  NavigationDestination toDestination(int? accountIndex) =>
      NavigationDestination(
        icon: Icon(icon),
        label: label,
        enabled: _isEnabled(accountIndex),
      );

  NavigationRailDestination toRailDestination(int? accountIndex) =>
      NavigationRailDestination(
        icon: Icon(icon),
        label: Text(label),
        disabled: !_isEnabled(accountIndex),
      );
}

final _pages = <OkanePageItem>[
  OkanePageItem(
    OkanePage.accounts,
    Icons.account_box,
    "Accounts",
    AccountListPage(isPage: false),
    null,
    false,
  ),
  OkanePageItem(
    OkanePage.transactions,
    Icons.monetization_on_rounded,
    "Transactions",
    TransactionListPage(),
    (_) => TransactionDetailsPage(),
    true,
  ),
  OkanePageItem(
    OkanePage.beneficiaries,
    Icons.person,
    "Beneficiaries",
    Container(),
    null,
    true,
  ),
  OkanePageItem(
    OkanePage.templates,
    Icons.list,
    "Templates",
    TemplateListPage(),
    null,
    true,
  ),
  OkanePageItem(
    OkanePage.budgets,
    Icons.pie_chart,
    "Budgets",
    BudgetListPage(),
    (_) => BudgetDetailsPage(),
    true,
  ),
];

class OkaneNavigationRail extends StatelessWidget {
  const OkaneNavigationRail({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<CoreCubit, CoreState>(
      builder:
          (context, state) => NavigationRail(
            onDestinationSelected:
                (i) => context.read<CoreCubit>().setPage(_pages[i].page),
            destinations:
                _pages
                    .map((p) => p.toRailDestination(state.activeAccountIndex))
                    .toList(),
            selectedIndex: _pages.indexWhere((p) => p.page == state.activePage),
          ),
    );
  }
}

class OkaneNavigationBar extends StatelessWidget {
  const OkaneNavigationBar({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<CoreCubit, CoreState>(
      builder:
          (context, state) => NavigationBar(
            onDestinationSelected:
                (i) => context.read<CoreCubit>().setPage(_pages[i].page),
            destinations:
                _pages
                    .map((p) => p.toDestination(state.activeAccountIndex))
                    .toList(),
            selectedIndex: _pages.indexWhere((p) => p.page == state.activePage),
          ),
    );
  }
}

class OkaneNavigationDrawer extends StatelessWidget {
  const OkaneNavigationDrawer({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<CoreCubit, CoreState>(
      builder:
          (context, state) => Drawer(
            child: ListView(
              children:
                  _pages
                      .map(
                        (p) => ListTile(
                          title: Text(p.label),
                          leading: Icon(p.icon),
                          selected: p.page == state.activePage,
                          onTap: () {
                            context.read<CoreCubit>().setPage(p.page);
                            Navigator.of(context).pop();
                          },
                        ),
                      )
                      .toList(),
            ),
          ),
    );
  }
}

class OkaneNavigationLayout extends StatelessWidget {
  const OkaneNavigationLayout({super.key});

  @override
  Widget build(BuildContext context) {
    final screenSize = getScreenSize(context);
    return BlocBuilder<CoreCubit, CoreState>(
      builder:
          (_, state) => IndexedStack(
            index: _pages.indexWhere((p) => p.page == state.activePage),
            children:
                _pages
                    .map(
                      (p) => switch (screenSize) {
                        ScreenSize.small => Column(
                          children: [
                            SizedBox(
                              height: 50,
                              child: Padding(
                                padding: EdgeInsets.all(8),
                                child: Row(
                                  children: [
                                    IconButton(
                                      icon: Icon(Icons.menu),
                                      onPressed: () {
                                        Scaffold.of(context).openDrawer();
                                      },
                                    ),

                                    if (p.showAccountName &&
                                        state.activeAccountIndex != null)
                                      Padding(
                                        padding: EdgeInsets.only(left: 8),
                                        child: Text(
                                          state
                                              .accounts[state
                                                  .activeAccountIndex!]
                                              .name!,
                                          style:
                                              Theme.of(
                                                context,
                                              ).textTheme.titleLarge,
                                        ),
                                      ),
                                  ],
                                ),
                              ),
                            ),
                            Expanded(child: p.child),
                          ],
                        ),
                        ScreenSize.normal => Column(
                          children: [
                            if (p.showAccountName &&
                                state.activeAccountIndex != null)
                              AccountIndicator(
                                accountName:
                                    state
                                        .accounts[state.activeAccountIndex!]
                                        .name!,
                              ),
                            Expanded(
                              child:
                                  p.details != null
                                      ? Row(
                                        children: [
                                          Expanded(child: p.child),
                                          Expanded(child: p.details!(false)),
                                        ],
                                      )
                                      : p.child,
                            ),
                          ],
                        ),
                      },
                    )
                    .toList(),
          ),
    );
  }
}