import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:ristoris/database/daos/articoli_dao.dart';
import '../../../database/daos/sconti_dao.dart';
import '../../../providers/auth_provider.dart';
import '../../widgets/cod_desc_dropdown_item.dart';
import '../../../providers/database_provider.dart';
import '../../../database/database.dart';
import '../../widgets/article_image.dart';

class ArticleSelectionResult {
  final Articolo articolo;
  final int idListino;
  final double colli;
  final double quantita;
  final double prezzoLordo;
  final double prezzoNetto;
  final double sconto1;
  final double sconto2;
  final double sconto3;
  final double sconto4;
  final double sconto5;

  const ArticleSelectionResult({
    required this.articolo,
    required this.idListino,
    required this.colli,
    required this.quantita,
    required this.prezzoLordo,
    required this.prezzoNetto,
    this.sconto1 = 0,
    this.sconto2 = 0,
    this.sconto3 = 0,
    this.sconto4 = 0,
    this.sconto5 = 0,
  });
}

class SelezioneArticoloPage extends ConsumerStatefulWidget {
  final int idCliente;
  final String dataOrdine;
  final int? idListinoDefault;

  const SelezioneArticoloPage({
    super.key,
    required this.idCliente,
    required this.dataOrdine,
    this.idListinoDefault,
  });

  @override
  ConsumerState<SelezioneArticoloPage> createState() =>
      _SelezioneArticoloPageState();
}

class _SelezioneArticoloPageState extends ConsumerState<SelezioneArticoloPage> {
  final _artCtrl = TextEditingController();
  List<Articolo> _searchResults = [];
  bool _searching = false;
  bool _usaListinoCliente = true;
  Map<int, Listino> _mapListini = {};

  @override
  void initState() {
    super.initState();
    _loadListini();
    _searchArticles('');
  }

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

  Future<void> _loadListini() async {
    final listini = await ref.read(listiniDaoProvider).listSenzaFiltro();
    setState(() {
      _mapListini = {for (final l in listini) l.idListino: l};
    });
  }

  Future<void> _searchArticles(String q) async {
    setState(() => _searching = true);
    final dao = ref.read(articoliDaoProvider);
    List<Articolo> results;
    if (_usaListinoCliente && widget.idCliente != 0) {
      results = await dao.getArticoliPerListinoCliente(
        widget.idCliente,
        widget.dataOrdine,
      );
    } else {
      results = await dao.getArticoliPerListinoAttivo(widget.dataOrdine, q);
    }
    if (q.isNotEmpty) {
      final lower = q.toLowerCase();
      results = results.where((a) {
        final cod = (a.codArticolo ?? '').toLowerCase();
        final desc = (a.descrizione ?? '').toLowerCase();
        final ean = (a.ean ?? '').toLowerCase();
        return cod.contains(lower) ||
            desc.contains(lower) ||
            ean.contains(lower);
      }).toList();
    }
    setState(() {
      _searchResults = results;
      _searching = false;
    });
  }

  void _showArticlePicker(Articolo art) async {
    final agente = ref.read(authProvider).agente;
    final canEditPrice = agente?.modificaPrezzi == 1;

    final listini = await ref
        .read(articoliDaoProvider)
        .getListiniArticoloValidi(art.idArticolo, widget.dataOrdine);

/*
    final seen = <int>{};
    final listini = listiniArticolo
        .map((la) => _mapListini[la.idListino])
        .whereType<Listino>()
        .where((l) => seen.add(l.idListino))
        .toList();
*/

    final scontiDao = ref.read(scontiDaoProvider);
    final articoliDao = ref.read(articoliDaoProvider);

    if (!context.mounted) return;

    final sheetResult = await showModalBottomSheet<ArticleSelectionResult>(
      context: context,
      isScrollControlled: true,
      builder: (_) => _ArticlePickerSheet(
        articolo: art,
        listini: listini,
        articoliDao: articoliDao,
        scontiDao: scontiDao,
        dataOrdine: widget.dataOrdine,
        canEditPrezzo: canEditPrice,
        idListinoDefault: widget.idListinoDefault,
        onConfirm: (
          colli,
          quantita,
          prezzoLordo,
          prezzoNetto,
          listinoId, {
          double sconto1 = 0,
          double sconto2 = 0,
          double sconto3 = 0,
          double sconto4 = 0,
          double sconto5 = 0,
        }) {
          Navigator.pop(
            context,
            ArticleSelectionResult(
              articolo: art,
              idListino: listinoId,
              colli: colli,
              quantita: quantita,
              prezzoLordo: prezzoLordo,
              prezzoNetto: prezzoNetto,
              sconto1: sconto1,
              sconto2: sconto2,
              sconto3: sconto3,
              sconto4: sconto4,
              sconto5: sconto5,
            ),
          );
        },
      ),
    );

    if (sheetResult != null && context.mounted) {
      Navigator.pop(context, sheetResult);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Selezione articolo'),
      ),
      body: SafeArea(
        child: Column(
          children: [
            Padding(
              padding: const EdgeInsets.all(12),
              child: Row(
                children: [
                  Expanded(
                    child: TextField(
                      controller: _artCtrl,
                      decoration: InputDecoration(
                        hintText: 'Cerca articolo...',
                        prefixIcon: const Icon(Icons.search),
                        suffixIcon: _searching
                            ? const SizedBox(
                                width: 20,
                                height: 20,
                                child: CircularProgressIndicator(
                                  strokeWidth: 2,
                                ),
                              )
                            : null,
                      ),
                      onChanged: _searchArticles,
                    ),
                  ),
                  const SizedBox(width: 8),
                  FilterChip(
                    label: const Text('Listino cliente'),
                    selected: _usaListinoCliente,
                    onSelected: (v) {
                      setState(() => _usaListinoCliente = v);
                      _searchArticles(_artCtrl.text);
                    },
                  ),
                ],
              ),
            ),
            Expanded(
              child: _searchResults.isEmpty
                  ? Center(
                      child: Text(
                        _searching ? 'Ricerca...' : 'Nessun articolo trovato',
                      ),
                    )
                  : ListView.builder(
                      itemCount: _searchResults.length,
                      itemBuilder: (_, i) => ListTile(
                        leading: ArticleImage(
                          idArticolo: _searchResults[i].idArticolo,
                          codArticolo: _searchResults[i].codArticolo,
                        ),
                        title: Text(_searchResults[i].descrizione ?? ''),
                        subtitle: Text(_searchResults[i].codArticolo ?? ''),
                        trailing: TextButton(
                          onPressed: () =>
                              _showArticlePicker(_searchResults[i]),
                          child: const Text('Aggiungi'),
                        ),
                      ),
                    ),
            ),
          ],
        ),
      ),
    );
  }
}

class _ArticlePickerSheet extends StatefulWidget {
  final Articolo articolo;
//  final List<ListinoArticolo> listiniArticolo;
  final List<Listino> listini;
  final ArticoliDao articoliDao;
  final ScontiDao scontiDao;

  final String dataOrdine;
  final bool canEditPrezzo;
  final int? idListinoDefault;
  final void Function(
    double colli,
    double quantita,
    double prezzoLordo,
    double prezzoNetto,
    int listinoId, {
    double sconto1,
    double sconto2,
    double sconto3,
    double sconto4,
    double sconto5,
  }) onConfirm;

  const _ArticlePickerSheet({
    required this.articolo,
    required this.listini,
    required this.articoliDao,
    required this.scontiDao,
    required this.dataOrdine,
    required this.canEditPrezzo,
    this.idListinoDefault,
    required this.onConfirm,
  });

  @override
  State<_ArticlePickerSheet> createState() => _ArticlePickerSheetState();
}

class _ArticlePickerSheetState extends State<_ArticlePickerSheet> {
  final _colliCtrl = TextEditingController();
  final _qtaCtrl = TextEditingController();
  final _prezzoCtrl = TextEditingController();
  final _sconto1Ctrl = TextEditingController();
  final _sconto2Ctrl = TextEditingController();
  final _sconto3Ctrl = TextEditingController();
  final _sconto4Ctrl = TextEditingController();
  final _sconto5Ctrl = TextEditingController();

  int? _selectedListino;
  double _prezzo = 0;
  double _prezzoNetto = 0;
  double _sconto1 = 0;
  double _sconto2 = 0;
  double _sconto3 = 0;
  double _sconto4 = 0;
  double _sconto5 = 0;

  bool _updatingColli = false;
  bool _updatingQta = false;

  @override
  void initState() {
    super.initState();
    _selectedListino = widget.idListinoDefault;
    if (_selectedListino != null &&
        !widget.listini.any((l) => l.idListino == _selectedListino)) {
      _selectedListino = null;
    }
    if (_selectedListino != null) {
      _loadPrezzo(_selectedListino!, widget.articolo.idArticolo);
    }
  }

  @override
  void dispose() {
    _colliCtrl.dispose();
    _qtaCtrl.dispose();
    _prezzoCtrl.dispose();
    _sconto1Ctrl.dispose();
    _sconto2Ctrl.dispose();
    _sconto3Ctrl.dispose();
    _sconto4Ctrl.dispose();
    _sconto5Ctrl.dispose();
    super.dispose();
  }

  void _loadPrezzo(int idListino, int idaArticolo) async {
    final lp = await widget.articoliDao
        .getListPrice(idListino, idaArticolo, widget.dataOrdine);

/*
    final lp = widget.listiniArticolo.cast<ListinoArticolo?>().firstWhere(
          (la) => la!.idListino == idListino,
          orElse: () => null,
        );
*/
    if (lp != null) {
      if (lp.prezzo != null) {
        setState(() => _prezzo = lp.prezzo!);
        _prezzoCtrl.text = _prezzo.toStringAsFixed(2);
      }
      if (lp.idSconto != null) {
        _loadSconti(lp.idSconto!);
      } else {
        _resetSconti();
      }
      _calcolaPrezzoNetto();
    }
  }

  Future<void> _loadSconti(int idSconto) async {
    final sconto = await widget.scontiDao.findById(idSconto);
    setState(() {
      _sconto1 = sconto?.sconto1 ?? 0;
      _sconto2 = sconto?.sconto2 ?? 0;
      _sconto3 = sconto?.sconto3 ?? 0;
      _sconto4 = sconto?.sconto4 ?? 0;
      _sconto5 = sconto?.sconto5 ?? 0;
    });
    _sconto1Ctrl.text = _sconto1 > 0 ? _sconto1.toStringAsFixed(1) : '';
    _sconto2Ctrl.text = _sconto2 > 0 ? _sconto2.toStringAsFixed(1) : '';
    _sconto3Ctrl.text = _sconto3 > 0 ? _sconto3.toStringAsFixed(1) : '';
    _sconto4Ctrl.text = _sconto4 > 0 ? _sconto4.toStringAsFixed(1) : '';
    _sconto5Ctrl.text = _sconto5 > 0 ? _sconto5.toStringAsFixed(1) : '';
  }

  void _resetSconti() {
    setState(() {
      _sconto1 = 0;
      _sconto2 = 0;
      _sconto3 = 0;
      _sconto4 = 0;
      _sconto5 = 0;
    });
    _sconto1Ctrl.clear();
    _sconto2Ctrl.clear();
    _sconto3Ctrl.clear();
    _sconto4Ctrl.clear();
    _sconto5Ctrl.clear();
  }

  void _calcolaPrezzoNetto() {
    double n = _prezzo;
    n *= (100 - _sconto1) / 100;
    n *= (100 - _sconto2) / 100;
    n *= (100 - _sconto3) / 100;
    n *= (100 - _sconto4) / 100;
    n *= (100 - _sconto5) / 100;
    setState(() => _prezzoNetto = n);
  }

  void _onPrezzoChanged(String v) {
    setState(() => _prezzo = double.tryParse(v) ?? 0);
    _calcolaPrezzoNetto();
  }

  void _onScontoChanged(int index, String v) {
    final val = double.tryParse(v) ?? 0;
    setState(() {
      switch (index) {
        case 1:
          _sconto1 = val;
        case 2:
          _sconto2 = val;
        case 3:
          _sconto3 = val;
        case 4:
          _sconto4 = val;
        case 5:
          _sconto5 = val;
      }
    });
    _calcolaPrezzoNetto();
  }

  void _onColliChanged(String v) {
    if (_updatingColli) return;
    _updatingQta = true;
    final colli = double.tryParse(v) ?? 0;
    final pezzi = widget.articolo.pezziConfezione ?? 0;
    if (colli > 0 && pezzi > 0) {
      _qtaCtrl.text = (colli * pezzi).toStringAsFixed(1);
    } else if (colli == 0) {
      _qtaCtrl.text = '';
    }
    _updatingQta = false;
  }

  void _onQtaChanged(String v) {
    if (_updatingQta) return;
    _updatingColli = true;
    final qta = double.tryParse(v) ?? 0;
    if (qta > 0) {
      _colliCtrl.text = '0';
    } else if (qta == 0) {
      _colliCtrl.text = '';
    }
    _updatingColli = false;
  }

  void _confirm() {
    final colli = double.tryParse(_colliCtrl.text) ?? 0;
    final qta = double.tryParse(_qtaCtrl.text) ?? 0;
    final prezzoLordo = double.tryParse(_prezzoCtrl.text) ?? 0;
    final listinoId = _selectedListino ?? 0;
    widget.onConfirm(
      colli,
      qta,
      prezzoLordo,
      _prezzoNetto,
      listinoId,
      sconto1: _sconto1,
      sconto2: _sconto2,
      sconto3: _sconto3,
      sconto4: _sconto4,
      sconto5: _sconto5,
    );
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Padding(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom,
        left: 16,
        right: 16,
        top: 16,
      ),
      child: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              widget.articolo.descrizione ?? '',
              style: theme.textTheme.titleMedium,
            ),
            const SizedBox(height: 4),
            Text(
              widget.articolo.codArticolo ?? '',
              style: theme.textTheme.bodySmall,
            ),
            if (widget.articolo.pezziConfezione != null)
              Text(
                'Pezzi/confezione: ${widget.articolo.pezziConfezione}',
                style: theme.textTheme.bodySmall,
              ),
            const SizedBox(height: 16),
            DropdownButtonFormField<int>(
              // initialValue: _selectedListino,
              decoration: const InputDecoration(labelText: 'Listino'),
              isExpanded: true,
              items: widget.listini.map((l) {
                print(l);
                return DropdownMenuItem(
                  value: l.idListino,
                  child: CodDescDropdownItem(
                    codice: l.codListino,
                    descrizione: l.descrizione,
                  ),
                );
              }).toList(),
              onChanged: (v) {
                setState(() => _selectedListino = v);
                if (v != null) _loadPrezzo(v, widget.articolo.idArticolo);
              },
            ),
            const SizedBox(height: 12),
            TextField(
              controller: _prezzoCtrl,
              decoration: const InputDecoration(labelText: 'Prezzo lordo'),
              keyboardType: const TextInputType.numberWithOptions(
                decimal: true,
              ),
              enabled: widget.canEditPrezzo,
              onChanged: _onPrezzoChanged,
            ),
            const SizedBox(height: 12),
            Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _sconto1Ctrl,
                    decoration: const InputDecoration(labelText: 'Sconto 1 %'),
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                    ),
                    onChanged: (v) => _onScontoChanged(1, v),
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: TextField(
                    controller: _sconto2Ctrl,
                    decoration: const InputDecoration(labelText: 'Sconto 2 %'),
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                    ),
                    onChanged: (v) => _onScontoChanged(2, v),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),
            Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _sconto3Ctrl,
                    decoration: const InputDecoration(labelText: 'Sconto 3 %'),
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                    ),
                    onChanged: (v) => _onScontoChanged(3, v),
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: TextField(
                    controller: _sconto4Ctrl,
                    decoration: const InputDecoration(labelText: 'Sconto 4 %'),
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                    ),
                    onChanged: (v) => _onScontoChanged(4, v),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),
            SizedBox(
              width: 140,
              child: TextField(
                controller: _sconto5Ctrl,
                decoration: const InputDecoration(labelText: 'Sconto 5 %'),
                keyboardType: const TextInputType.numberWithOptions(
                  decimal: true,
                ),
                onChanged: (v) => _onScontoChanged(5, v),
              ),
            ),
            const SizedBox(height: 16),
            Row(
              children: [
                Text('Prezzo netto: ', style: theme.textTheme.bodyLarge),
                Text(
                  _prezzoNetto.toStringAsFixed(2),
                  style: theme.textTheme.bodyLarge?.copyWith(
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),
            Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _colliCtrl,
                    decoration: const InputDecoration(labelText: 'Colli'),
                    keyboardType: TextInputType.number,
                    onChanged: _onColliChanged,
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: TextField(
                    controller: _qtaCtrl,
                    decoration: const InputDecoration(labelText: 'Quantità'),
                    keyboardType: TextInputType.number,
                    onChanged: _onQtaChanged,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 20),
            SizedBox(
              width: double.infinity,
              child: ElevatedButton(
                onPressed: _confirm,
                child: const Text('Aggiungi'),
              ),
            ),
            const SizedBox(height: 8),
          ],
        ),
      ),
    );
  }
}