import 'package:dietary_guard/controllers/alert.dart';
import 'package:dietary_guard/models/alert_configuration.dart';
import 'package:dietary_guard/models/food_data.dart';
import 'package:dietary_guard/widgets/alert_detect_result.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

class FoodDetailsScreen extends StatefulWidget {
  final FoodData item;

  const FoodDetailsScreen({super.key, required this.item});

  @override
  State<FoodDetailsScreen> createState() => _FoodDetailsScreenState();
}

class _FoodDetailsScreenState extends State<FoodDetailsScreen> {
  final List<AlertDetectResult> _alertDetectResult = List.empty(growable: true);

  @override
  void initState() {
    super.initState();
    _detectAlert();
  }

  void _detectAlert() {
    final AlertController alert = Get.find();
    if (alert.configuration.isEmpty) return;

    for (final item in alert.configuration) {
      bool isUndetected = true;
      bool isOutOfRange = false;
      double? difference;
      String name = 'undetected'.tr;
      String? unitName;
      FoodNutrient? current;
      for (final nutrient in widget.item.foodNutrients) {
        if (item.nutrientId != nutrient.nutrientId) continue;
        name = nutrient.nutrientName;
        unitName = unitNameValues.reverse[nutrient.unitName];
        if (nutrient.value != null) {
          current = nutrient;
          final value = nutrient.value!;
          if (value > item.maxValue) {
            difference = value - item.maxValue;
            isOutOfRange = true;
          } else if (value < item.minValue) {
            difference = value - item.minValue;
            isOutOfRange = true;
          }
          isUndetected = false;
        }
      }

      _alertDetectResult.add(AlertDetectResult(
        config: item,
        nutrient: current,
        name: name,
        unitName: unitName,
        difference: difference,
        isOutOfRange: isOutOfRange,
        isUndetected: isUndetected,
      ));
    }
  }

  Widget _buildShowAlertResultButton() {
    return IconButton(
      icon: const Icon(Icons.assignment),
      onPressed: () {
        showModalBottomSheet(
          useRootNavigator: true,
          isScrollControlled: true,
          context: context,
          builder: (context) => AlertDetectResultDialog(
            result: _alertDetectResult,
          ),
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Material(
      color: Theme.of(context).colorScheme.surface,
      child: Scaffold(
        appBar: AppBar(
          title: Text(widget.item.description),
        ),
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (_alertDetectResult.isEmpty)
              MaterialBanner(
                padding: const EdgeInsets.only(left: 24, right: 8),
                content: Text('alertEmpty'.tr),
                actions: const [SizedBox()],
                dividerColor: Colors.transparent,
              )
            else if (_alertDetectResult.any((x) => x.isOutOfRange))
              MaterialBanner(
                leading: const Icon(Icons.close),
                backgroundColor: Colors.red,
                padding: const EdgeInsets.only(left: 24, right: 8),
                content: Text('alertOutOfRange'.trParams({
                  'count': _alertDetectResult
                      .where((x) => x.isOutOfRange)
                      .length
                      .toString()
                })),
                actions: [_buildShowAlertResultButton()],
                dividerColor: Colors.transparent,
              )
            else if (_alertDetectResult.any((x) => x.isUndetected))
              MaterialBanner(
                leading: const Icon(Icons.question_mark),
                backgroundColor: Colors.grey,
                padding: const EdgeInsets.only(left: 24, right: 8),
                content: Text('alertUnclear'.trParams({
                  'count': _alertDetectResult
                      .where((x) => x.isUndetected)
                      .length
                      .toString()
                })),
                actions: [_buildShowAlertResultButton()],
                dividerColor: Colors.transparent,
              )
            else
              MaterialBanner(
                leading: const Icon(Icons.check),
                backgroundColor: Colors.green,
                padding: const EdgeInsets.only(left: 24, right: 8),
                content: Text('alertSafe'.tr),
                actions: [_buildShowAlertResultButton()],
                dividerColor: Colors.transparent,
              ),
            const SizedBox(height: 16),
            Text('nutrients'.tr).paddingOnly(left: 24, right: 24, bottom: 8),
            Expanded(
              child: ListView.builder(
                itemCount: widget.item.foodNutrients.length,
                itemBuilder: (context, idx) {
                  final entry = widget.item.foodNutrients[idx];
                  final unitName = unitNameValues.reverse[entry.unitName];
                  return ListTile(
                    contentPadding: const EdgeInsets.symmetric(horizontal: 24),
                    title: Row(
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: [
                        Text(entry.nutrientName),
                        const SizedBox(width: 6),
                        Badge(label: Text('#${entry.nutrientId}'))
                      ],
                    ),
                    subtitle: Text(
                      '${entry.value?.toString() ?? '-'} $unitName',
                    ),
                  );
                },
              ),
            )
          ],
        ),
      ),
    );
  }
}