Sp 1593 reworks (#277)

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## Jira Ticket
[SP-1593](https://syncrow.atlassian.net/browse/SP-1593)

## Description

1. AQI Distribution chart bars when all values are empty.
2. Min element in Y axis of Range of AQI chart is visible.
3. Matched AQI chart titles to have the same size for consistency.
4. Allowed `RangeOfAqiValue` model's values to be nullable, and they
fallback to `0` when null.
5. Implemented AQI Legend.
6. Increased the size of AQI Distribution chart's tooltip.
7. Improved alignment of location cell.
8. Doesn't fetch devices on date change.

## Type of Change

<!--- Put an `x` in all the boxes that apply: -->

- [x] ✨ New feature (non-breaking change which adds functionality)
- [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
- [ ] ❌ Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 Code refactor
- [ ] ✅ Build configuration change
- [ ] 📝 Documentation
- [ ] 🗑️ Chore 


[SP-1593]:
https://syncrow.atlassian.net/browse/SP-1593?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

lib/pages/analytics/models/range_of_aqi.dart

@@ -38,9 +38,9 @@ class RangeOfAqiValue extends Equatable {
   factory RangeOfAqiValue.fromJson(Map<String, dynamic> json) {
     return RangeOfAqiValue(
       type: json['type'] as String,
-      min: (json['min'] as num).toDouble(),
+      min: (json['min'] as num? ?? 0).toDouble(),
-      average: (json['average'] as num).toDouble(),
+      average: (json['average'] as num? ?? 0).toDouble(),
-      max: (json['max'] as num).toDouble(),
+      max: (json['max'] as num? ?? 0).toDouble(),
     );
   }
 

lib/pages/analytics/modules/air_quality/helpers/fetch_air_quality_data_helper.dart

@@ -24,11 +24,13 @@ abstract final class FetchAirQualityDataHelper {
   }) {
     final date = context.read<AnalyticsDatePickerBloc>().state.monthlyDate;
     final aqiType = context.read<AirQualityDistributionBloc>().state.selectedAqiType;
+    if (shouldFetchAnalyticsDevices) {
       loadAnalyticsDevices(
         context,
         communityUuid: communityUuid,
         spaceUuid: spaceUuid,
       );
+    }
     loadRangeOfAqi(
       context,
       spaceUuid: spaceUuid,

lib/pages/analytics/modules/air_quality/helpers/range_of_aqi_charts_helper.dart

@@ -23,6 +23,7 @@ abstract final class RangeOfAqiChartsHelper {
     return titlesData.copyWith(
       bottomTitles: titlesData.bottomTitles.copyWith(
         sideTitles: titlesData.bottomTitles.sideTitles.copyWith(
+          reservedSize: 36,
           getTitlesWidget: (value, meta) => Padding(
             padding: const EdgeInsetsDirectional.only(top: 20.0),
             child: Text(
@@ -40,6 +41,7 @@ abstract final class RangeOfAqiChartsHelper {
           reservedSize: 70,
           interval: 50,
           maxIncluded: false,
+          minIncluded: true,
           getTitlesWidget: (value, meta) {
             final text = value >= 300 ? '301+' : value.toInt().toString();
             return Padding(

lib/pages/analytics/modules/air_quality/views/air_quality_view.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:syncrow_web/pages/analytics/modules/air_quality/widgets/air_quality_end_side_widget.dart';
 import 'package:syncrow_web/pages/analytics/modules/air_quality/widgets/aqi_distribution_chart_box.dart';
+import 'package:syncrow_web/pages/analytics/modules/air_quality/widgets/aqi_legend.dart';
 import 'package:syncrow_web/pages/analytics/modules/air_quality/widgets/range_of_aqi_chart_box.dart';
 
 class AirQualityView extends StatelessWidget {
@@ -20,6 +21,10 @@ class AirQualityView extends StatelessWidget {
             child: Column(
               spacing: 32,
               children: [
+                SizedBox(
+                  height: height * 0.1,
+                  child: const AqiLegend(),
+                ),
                 SizedBox(
                   height: height * 1.2,
                   child: const AirQualityEndSideWidget(),
@@ -40,7 +45,7 @@ class AirQualityView extends StatelessWidget {
         return SingleChildScrollView(
           child: Container(
             padding: _padding,
-            height: height * 1.1,
+            height: height * 1.2,
             child: const Column(
               children: [
                 Expanded(
@@ -52,8 +57,9 @@ class AirQualityView extends StatelessWidget {
                         child: Column(
                           spacing: 20,
                           children: [
-                            Expanded(child: RangeOfAqiChartBox()),
+                            Expanded(flex: 2, child: AqiLegend()),
-                            Expanded(child: AqiDistributionChartBox()),
+                            Expanded(flex: 12, child: RangeOfAqiChartBox()),
+                            Expanded(flex: 12, child: AqiDistributionChartBox()),
                           ],
                         ),
                       ),

lib/pages/analytics/modules/air_quality/widgets/aqi_distribution_chart.dart

@@ -32,8 +32,13 @@ class AqiDistributionChart extends StatelessWidget {
   }
 
   List<BarChartGroupData> _buildBarGroups() {
-    return List.generate(chartData.length, (index) {
+    final groups = <BarChartGroupData>[];
-      final data = chartData[index];
+    for (var i = 0; i < chartData.length; i++) {
+      final data = chartData[i];
+      final isAllZero = data.data.every((d) => d.percentage == 0);
+      if (isAllZero) {
+        continue;
+      }
       final stackItems = <BarChartRodData>[];
       double currentY = 0;
       var isFirstElement = true;
@@ -56,13 +61,15 @@ class AqiDistributionChart extends StatelessWidget {
         currentY += percentageData.percentage + _rodStackItemsSpacing;
         isFirstElement = false;
       }
-
+      groups.add(
-      return BarChartGroupData(
+        BarChartGroupData(
-        x: index,
+          x: i,
           barRods: stackItems,
           groupVertically: true,
+        ),
       );
-    });
+    }
+    return groups;
   }
 
   BarTouchData _barTouchData(BuildContext context) {
@@ -73,6 +80,7 @@ class AqiDistributionChart extends StatelessWidget {
           color: ColorsManager.semiTransparentBlack,
         ),
         tooltipRoundedRadius: 16,
+        maxContentWidth: 500,
         tooltipPadding: const EdgeInsets.all(8),
         getTooltipItem: (group, groupIndex, rod, rodIndex) {
           final data = chartData[group.x];
@@ -81,10 +89,13 @@ class AqiDistributionChart extends StatelessWidget {
 
           final textStyle = context.textTheme.bodySmall?.copyWith(
             color: ColorsManager.blackColor,
-            fontSize: 8,
+            fontSize: 11,
           );
 
           for (final percentageData in data.data) {
+            if (percentageData.percentage == 0) {
+              continue;
+            }
             final percentage = percentageData.percentage.toStringAsFixed(1);
             final type = percentageData.type[0].toUpperCase() +
                 percentageData.type.substring(1).replaceAll('_', ' ');
@@ -98,7 +109,7 @@ class AqiDistributionChart extends StatelessWidget {
             DateFormat('dd/MM/yyyy').format(data.date),
             context.textTheme.bodyMedium!.copyWith(
               color: ColorsManager.blackColor,
-              fontSize: 9,
+              fontSize: 12,
               fontWeight: FontWeight.w600,
             ),
             textAlign: TextAlign.start,
@@ -118,7 +129,6 @@ class AqiDistributionChart extends StatelessWidget {
     final leftTitles = titlesData.leftTitles.copyWith(
       sideTitles: titlesData.leftTitles.sideTitles.copyWith(
         reservedSize: 70,
-        interval: 20,
         maxIncluded: false,
         minIncluded: true,
         getTitlesWidget: (value, meta) => Padding(
@@ -140,7 +150,7 @@ class AqiDistributionChart extends StatelessWidget {
 
     final bottomTitles = AxisTitles(
       sideTitles: SideTitles(
-        showTitles: true,
+        showTitles: chartData.isNotEmpty,
         getTitlesWidget: (value, _) => FittedBox(
           alignment: AlignmentDirectional.bottomCenter,
           fit: BoxFit.scaleDown,
@@ -148,7 +158,7 @@ class AqiDistributionChart extends StatelessWidget {
             chartData[value.toInt()].date.day.toString(),
             style: context.textTheme.bodySmall?.copyWith(
               color: ColorsManager.lightGreyColor,
-              fontSize: 8,
+              fontSize: 12,
             ),
           ),
         ),

lib/pages/analytics/modules/air_quality/widgets/aqi_distribution_chart_title.dart

@@ -19,7 +19,7 @@ class AqiDistributionChartTitle extends StatelessWidget {
       children: [
         ChartsLoadingWidget(isLoading: isLoading),
         const Expanded(
-          flex: 3,
+          flex: 4,
           child: FittedBox(
             fit: BoxFit.scaleDown,
             alignment: AlignmentDirectional.centerStart,
@@ -28,7 +28,9 @@ class AqiDistributionChartTitle extends StatelessWidget {
             ),
           ),
         ),
-        FittedBox(
+        Expanded(
+          flex: 2,
+          child: FittedBox(
             alignment: AlignmentDirectional.centerEnd,
             fit: BoxFit.scaleDown,
             child: AqiTypeDropdown(
@@ -47,6 +49,7 @@ class AqiDistributionChartTitle extends StatelessWidget {
               },
             ),
           ),
+        ),
       ],
     );
   }

lib/pages/analytics/modules/air_quality/widgets/aqi_legend.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+import 'package:syncrow_web/pages/analytics/modules/air_quality/helpers/range_of_aqi_charts_helper.dart';
+import 'package:syncrow_web/pages/analytics/modules/analytics/widgets/chart_informative_cell.dart';
+import 'package:syncrow_web/utils/style.dart';
+
+class AqiLegend extends StatelessWidget {
+  const AqiLegend({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsetsDirectional.all(20),
+      decoration: subSectionContainerDecoration.copyWith(
+        borderRadius: BorderRadius.circular(20),
+      ),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.center,
+        spacing: 16,
+        children: RangeOfAqiChartsHelper.gradientData.map((e) {
+          return Flexible(
+            flex: 4,
+            child: FittedBox(
+              fit: BoxFit.fill,
+              child: ChartInformativeCell(
+                color: e.$1,
+                title: FittedBox(
+                  fit: BoxFit.fill,
+                  child: Text(e.$2),
+                ),
+                height: null,
+              ),
+            ),
+          );
+        }).toList(),
+      ),
+    );
+  }
+}

lib/pages/analytics/modules/air_quality/widgets/aqi_location_info_cell.dart

@@ -47,19 +47,29 @@ class AqiLocationInfoCell extends StatelessWidget {
               ),
             ),
             Align(
-              alignment: AlignmentDirectional.bottomEnd,
+              alignment: AlignmentDirectional.bottomCenter,
-              child: Padding(
+              child: Row(
-                padding: const EdgeInsetsDirectional.all(10),
+                crossAxisAlignment: CrossAxisAlignment.end,
-                child: SizedBox(
+                children: [
-                  height: 40,
+                  Expanded(
-                  width: 120,
+                    child: SvgPicture.asset(
+                      svgPath,
+                      fit: BoxFit.scaleDown,
+                      alignment: AlignmentDirectional.bottomStart,
+                    ),
+                  ),
+                  Expanded(
                     child: FittedBox(
                       fit: BoxFit.scaleDown,
                       alignment: AlignmentDirectional.bottomEnd,
+                      child: Padding(
+                        padding: const EdgeInsetsDirectional.all(10),
                         child: Text(
                           value,
                           style: context.textTheme.bodySmall?.copyWith(
-                        color: ColorsManager.vividBlue.withValues(alpha: 0.7),
+                            color: ColorsManager.vividBlue.withValues(
+                              alpha: 0.7,
+                            ),
                             fontWeight: FontWeight.w700,
                             fontSize: 24,
                           ),
@@ -67,16 +77,7 @@ class AqiLocationInfoCell extends StatelessWidget {
                       ),
                     ),
                   ),
-            ),
+                ],
-            Align(
-              alignment: AlignmentDirectional.bottomStart,
-              child: SizedBox.square(
-                dimension: MediaQuery.sizeOf(context).width * 0.45,
-                child: FittedBox(
-                  fit: BoxFit.scaleDown,
-                  alignment: AlignmentDirectional.bottomStart,
-                  child: SvgPicture.asset(svgPath),
-                ),
               ),
             ),
           ],

lib/pages/analytics/modules/analytics/widgets/chart_informative_cell.dart

@@ -7,16 +7,18 @@ class ChartInformativeCell extends StatelessWidget {
     required this.title,
     required this.color,
     this.hasBorder = false,
+    this.height,
   });
 
   final Widget title;
   final Color color;
   final bool hasBorder;
+  final double? height;
 
   @override
   Widget build(BuildContext context) {
     return Container(
-      height: MediaQuery.sizeOf(context).height * 0.0385,
+      height: height ?? MediaQuery.sizeOf(context).height * 0.0385,
       padding: const EdgeInsetsDirectional.symmetric(
         vertical: 8,
         horizontal: 12,