import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:intl/intl.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';

enum ArticleFilterMode { tutti, offertaCliente, acquistatiInPassato }

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<ArticoliConPromoData> _searchResults = [];
  bool _searching = false;
  ArticleFilterMode _filterMode = ArticleFilterMode.offertaCliente;

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

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

  Future<void> _searchArticles(String q) async {
    setState(() => _searching = true);
    final articoliDao = ref.read(articoliDaoProvider);
    final clientiDao = ref.read(clientiDaoProvider);
    List<ArticoliConPromoData> results;

    switch (_filterMode) {
      case ArticleFilterMode.tutti:
        results =
            await articoliDao.getActiveItemsWithPromo(q, widget.idCliente);
      case ArticleFilterMode.offertaCliente:
        results = await clientiDao.getFavoriteItems(
          widget.idCliente,
          widget.dataOrdine,
          q,
        );
      case ArticleFilterMode.acquistatiInPassato:
        final dataOrdineParsed = DateTime.parse(widget.dataOrdine);
        final dataDa180 = dataOrdineParsed.subtract(const Duration(days: 180));
        final dataDa180Str = DateFormat('yyyy-MM-dd').format(dataDa180);
        results = await clientiDao.getAlreadySoldItems(
          0,
          widget.idCliente,
          dataDa180Str,
          q,
        );
    }

    setState(() {
      _searchResults = results;
      _searching = false;
    });
  }

  void _showArticlePicker(int idArticolo) async {
    final art = await ref.read(articoliDaoProvider).getById(idArticolo);
    if (art == null || !context.mounted) return;

    final agente = ref.read(authProvider).agente;
    final canEditPrice = agente?.modificaPrezzi == 1;

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

    final listiniCliente = await articoliDao.getListiniClienteValidi(
        widget.idCliente, art.idArticolo, widget.dataOrdine);
    final listinoCliente =
        listiniCliente.isNotEmpty ? listiniCliente.first : null;

    final scontiDao = ref.read(scontiDaoProvider);

    if (!context.mounted) return;

    final sheetResult = await showModalBottomSheet<ArticleSelectionResult>(
      context: context,
      isScrollControlled: true,
      builder: (_) => _ArticlePickerSheet(
        articolo: art,
        listini: listini,
        listinoCliente: listinoCliente,
        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) {
    final theme = Theme.of(context);
    final currencyFormat = NumberFormat.currency(locale: 'it', symbol: '€');
    final dateFormat = DateFormat('dd/MM/yyyy');

    return Scaffold(
      appBar: AppBar(
        title: const Text('Selezione articolo'),
      ),
      body: SafeArea(
        child: Column(
          children: [
            Padding(
              padding: const EdgeInsets.fromLTRB(12, 12, 12, 0),
              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,
              ),
            ),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              child: SegmentedButton<ArticleFilterMode>(
                segments: const [
                  ButtonSegment(
                    value: ArticleFilterMode.offertaCliente,
                    label: Text('Offerta cliente'),
                  ),
                  ButtonSegment(
                    value: ArticleFilterMode.tutti,
                    label: Text('Tutti'),
                  ),
                  ButtonSegment(
                    value: ArticleFilterMode.acquistatiInPassato,
                    label: Text('Acquistati'),
                  ),
                ],
                selected: {_filterMode},
                onSelectionChanged: (selected) {
                  setState(() => _filterMode = selected.first);
                  _searchArticles(_artCtrl.text);
                },
              ),
            ),
            Expanded(
              child: _searchResults.isEmpty
                  ? Center(
                      child: Text(
                        _searching ? 'Ricerca...' : 'Nessun articolo trovato',
                      ),
                    )
                  : ListView.builder(
                      itemCount: _searchResults.length,
                      itemBuilder: (_, i) {
                        final item = _searchResults[i];
                        final hasLastPurchase = item.ultimoPrezzo != null &&
                            item.lastDateSold != null;

                        return Column(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            ListTile(
                              leading: ArticleImage(
                                idArticolo: item.idArticolo,
                                codArticolo: item.codArticolo,
                              ),
                              title: Text(
                                  '${item.codArticolo} ${item.descrizione}'),
                              // subtitle: Text(item.codArticolo ?? ''),
                              trailing: Row(
                                mainAxisSize: MainAxisSize.min,
                                children: [
                                  if (item.inPromo == 1)
                                    const Icon(
                                      Icons.star,
                                      color: Colors.amber,
                                      size: 20,
                                    ),
                                  TextButton(
                                    onPressed: () =>
                                        _showArticlePicker(item.idArticolo),
                                    child: const Text('Aggiungi'),
                                  ),
                                ],
                              ),
                            ),
                            if (hasLastPurchase)
                              Padding(
                                padding: const EdgeInsets.only(
                                  left: 72,
                                  right: 16,
                                  bottom: 8,
                                ),
                                child: Row(
                                  children: [
                                    Text(
                                      'Ultimo acquisto: ',
                                      style: theme.textTheme.bodySmall,
                                    ),
                                    Text(
                                      currencyFormat.format(item.ultimoPrezzo),
                                      style: theme.textTheme.bodySmall
                                          ?.copyWith(
                                              fontWeight: FontWeight.bold),
                                    ),
                                    const SizedBox(width: 8),
                                    Text(
                                      dateFormat.format(
                                        DateTime.parse(item.lastDateSold!),
                                      ),
                                      style: theme.textTheme.bodySmall,
                                    ),
                                  ],
                                ),
                              ),
                          ],
                        );
                      },
                    ),
            ),
          ],
        ),
      ),
    );
  }
}

const int _kListinoClienteSentinel = -1;

class _ArticlePickerSheet extends StatefulWidget {
  final Articolo articolo;
  final List<Listino> listini;
  final ListinoCliente? listinoCliente;
  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,
    this.listinoCliente,
    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();
    if (widget.listinoCliente != null) {
      _selectedListino = _kListinoClienteSentinel;
    } else {
      _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 {
    if (idListino == _kListinoClienteSentinel &&
        widget.listinoCliente != null) {
      final lc = widget.listinoCliente!;
      if (lc.prezzo != null) {
        setState(() => _prezzo = lc.prezzo!);
        _prezzoCtrl.text = _prezzo.toStringAsFixed(2);
      }
      if (lc.idSconto != null) {
        _loadSconti(lc.idSconto!);
      } else {
        _resetSconti();
      }
      _calcolaPrezzoNetto();
      return;
    }

    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 == _kListinoClienteSentinel
        ? (widget.listinoCliente?.idListino ?? 0)
        : (_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: [
                if (widget.listinoCliente != null)
                  DropdownMenuItem(
                    value: _kListinoClienteSentinel,
                    child: const Text(
                      'Listino Cliente',
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        color: Colors.blue,
                      ),
                    ),
                  ),
                ...widget.listini.map((l) {
                  return DropdownMenuItem(
                    value: l.idListino,
                    child: CodDescDropdownItem(
                      codice: l.codListino,
                      descrizione: l.descrizione,
                    ),
                  );
                }),
              ],
              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),
          ],
        ),
      ),
    );
  }
}