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

import '../../core/i18n/app_localizations.dart';
import '../../core/theme/app_colors_extension.dart';

enum AppInputType { text, integer, decimal }

class AppInputDialog {
  static Future<String?> show({
    required BuildContext context,
    required String title,
    String? hintText,
    String initialText = '',
    AppInputType inputType = AppInputType.text,
    int decimalPlaces = 2,
    num? min,
    num? max,
    bool barrierDismissible = true,
  }) {
    final l10n = AppLocalizations.of(context);
    final ctrl = TextEditingController(text: initialText);
    final colors = Theme.of(context).extension<AppColorsExtension>()!;

    TextInputType keyboardType;
    List<TextInputFormatter>? inputFormatters;
    switch (inputType) {
      case AppInputType.text:
        keyboardType = TextInputType.text;
        inputFormatters = null;
      case AppInputType.integer:
        keyboardType = const TextInputType.numberWithOptions(decimal: false);
        inputFormatters = [FilteringTextInputFormatter.digitsOnly];
      case AppInputType.decimal:
        keyboardType = const TextInputType.numberWithOptions(decimal: true);
        inputFormatters = [
          FilteringTextInputFormatter.allow(
            RegExp(r'^-?\d*\.?\d{0,' + decimalPlaces.toString() + '}'),
          ),
        ];
    }

    void onConfirm() {
      final value = ctrl.text.trim();
      if (value.isEmpty) {
        Navigator.pop(context);
        return;
      }
      if (inputType != AppInputType.text) {
        final num? parsed = double.tryParse(value);
        if (parsed == null) {
          TDToast.showText(l10n.get('enterValidNumber'), context: context);
          return;
        }
        if (min != null && parsed < min) {
          TDToast.showText('${l10n.get('minValue')}: $min', context: context);
          return;
        }
        if (max != null && parsed > max) {
          TDToast.showText('${l10n.get('maxValue')}: $max', context: context);
          return;
        }
      }
      Navigator.pop(context, value);
    }

    Widget buildCard(Color _, BuildContext ctx) {
      final bottomInset = MediaQuery.of(ctx).viewInsets.bottom;
      return Material(
        color: Colors.transparent,
        child: GestureDetector(
          onTap: () => FocusScope.of(ctx).unfocus(),
          child: Padding(
            padding: EdgeInsets.only(bottom: bottomInset),
            child: Center(
            child: GestureDetector(
              onTap: () {},
              child: Container(
                margin: const EdgeInsets.symmetric(horizontal: 32),
                padding: const EdgeInsets.fromLTRB(20, 24, 20, 8),
                decoration: BoxDecoration(
                  color: colors.bgCard,
                  borderRadius: BorderRadius.circular(12),
                ),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(title,
                        style: TextStyle(
                            fontSize: 18,
                            fontWeight: FontWeight.w600,
                            color: colors.textPrimary)),
                    const SizedBox(height: 20),
                    _InputField(
                      controller: ctrl,
                      keyboardType: keyboardType,
                      inputFormatters: inputFormatters,
                      hintText: hintText ?? l10n.get('pleaseEnter'),
                    ),
                    if (inputType != AppInputType.text &&
                        (min != null || max != null)) ...[
                      const SizedBox(height: 8),
                      Align(
                        alignment: Alignment.centerRight,
                        child: Text(_rangeHint(min, max),
                            style: TextStyle(
                                fontSize: 12, color: colors.textPlaceholder)),
                      ),
                    ],
                    const SizedBox(height: 20),
                    Row(
                      children: [
                        Expanded(
                          child: TextButton(
                            onPressed: () => Navigator.pop(ctx),
                            child: Text(l10n.get('cancel'),
                                style: TextStyle(
                                    fontSize: 16,
                                    color: colors.textSecondary)),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: TextButton(
                            onPressed: onConfirm,
                            child: Text(l10n.get('confirm'),
                                style: TextStyle(
                                    fontSize: 16,
                                    fontWeight: FontWeight.w600,
                                    color: colors.primary)),
                          ),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ),
          ),
        ),
        ),
      );
    }

    return showGeneralDialog<String>(
      context: context,
      barrierDismissible: barrierDismissible,
      barrierLabel: barrierDismissible ? 'Dismiss' : null,
      barrierColor: Colors.black38,
      transitionBuilder: (ctx, animation, secondaryAnimation, child) {
        return FadeTransition(
          opacity:
              CurvedAnimation(parent: animation, curve: Curves.easeOut),
          child: child,
        );
      },
      pageBuilder: (ctx, animation, secondaryAnimation) {
        return buildCard(Colors.transparent, ctx);
      },
    );
  }

  static String _rangeHint(num? min, num? max) {
    if (min != null && max != null) return '$min ~ $max';
    if (min != null) return '≥ $min';
    if (max != null) return '≤ $max';
    return '';
  }
}

class _InputField extends StatefulWidget {
  final TextEditingController controller;
  final TextInputType keyboardType;
  final List<TextInputFormatter>? inputFormatters;
  final String hintText;

  const _InputField({
    required this.controller,
    required this.keyboardType,
    this.inputFormatters,
    required this.hintText,
  });

  @override
  State<_InputField> createState() => _InputFieldState();
}

class _InputFieldState extends State<_InputField> {
  bool _hasText = false;

  @override
  void initState() {
    super.initState();
    _hasText = widget.controller.text.isNotEmpty;
    widget.controller.addListener(_onChange);
  }

  void _onChange() {
    final has = widget.controller.text.isNotEmpty;
    if (has != _hasText) setState(() => _hasText = has);
  }

  @override
  void dispose() {
    widget.controller.removeListener(_onChange);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    return Container(
      decoration: BoxDecoration(
        color: colors.bgPage,
        borderRadius: BorderRadius.circular(4),
      ),
      child: TextField(
        controller: widget.controller,
        autofocus: true,
        keyboardType: widget.keyboardType,
        inputFormatters: widget.inputFormatters,
        style: TextStyle(fontSize: 16, color: colors.textPrimary),
        decoration: InputDecoration(
          hintText: widget.hintText,
          hintStyle: TextStyle(fontSize: 16, color: colors.textPlaceholder),
          contentPadding:
              const EdgeInsets.symmetric(horizontal: 12, vertical: 14),
          border: InputBorder.none,
          isCollapsed: true,
          suffixIcon: _hasText
              ? GestureDetector(
                  onTap: () {
                    widget.controller.clear();
                    setState(() => _hasText = false);
                  },
                  child: const Padding(
                    padding: EdgeInsets.only(right: 8),
                    child:
                        Icon(Icons.close, size: 18, color: Color(0xFFBBBBBB)),
                  ),
                )
              : null,
        ),
      ),
    );
  }
}