545 lines
16 KiB
Dart
545 lines
16 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:intl/intl.dart';
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import 'package:mileograph_flutter/objects/objects.dart';
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import 'package:mileograph_flutter/services/dataService.dart';
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import 'package:provider/provider.dart';
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class LocoTimelinePage extends StatefulWidget {
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const LocoTimelinePage({
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super.key,
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required this.locoId,
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required this.locoLabel,
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});
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final int locoId;
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final String locoLabel;
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@override
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State<LocoTimelinePage> createState() => _LocoTimelinePageState();
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}
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class _LocoTimelinePageState extends State<LocoTimelinePage> {
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addPostFrameCallback((_) => _load());
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}
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Future<void> _load() {
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return context.read<DataService>().fetchLocoTimeline(widget.locoId);
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}
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@override
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Widget build(BuildContext context) {
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final data = context.watch<DataService>();
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final timeline = data.timelineForLoco(widget.locoId);
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final isLoading = data.isLocoTimelineLoading(widget.locoId);
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return Scaffold(
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appBar: AppBar(
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leading: IconButton(
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icon: const Icon(Icons.arrow_back),
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onPressed: () => Navigator.of(context).maybePop(),
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),
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title: Text('Timeline · ${widget.locoLabel}'),
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),
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body: RefreshIndicator(
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onRefresh: _load,
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child: ListView(
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padding: const EdgeInsets.all(16),
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physics: const AlwaysScrollableScrollPhysics(),
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children: [
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Text(
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'Attribute timeline',
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style: Theme.of(context).textTheme.titleLarge?.copyWith(
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fontWeight: FontWeight.w800,
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),
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),
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const SizedBox(height: 6),
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Text(
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'Each row is an attribute. Blocks stretch between change dates; scroll sideways for history.',
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style: Theme.of(context).textTheme.bodyMedium,
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),
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const SizedBox(height: 16),
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if (isLoading && timeline.isEmpty)
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const Padding(
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padding: EdgeInsets.symmetric(vertical: 32.0),
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child: Center(child: CircularProgressIndicator()),
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)
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else if (timeline.isEmpty)
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Card(
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child: Padding(
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padding: const EdgeInsets.all(16.0),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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'No timeline data yet',
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style: Theme.of(context).textTheme.titleMedium?.copyWith(
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fontWeight: FontWeight.w700,
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),
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),
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const SizedBox(height: 8),
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const Text(
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'This locomotive does not have any attribute history to show right now.',
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),
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const SizedBox(height: 12),
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OutlinedButton.icon(
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onPressed: _load,
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icon: const Icon(Icons.refresh),
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label: const Text('Try again'),
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),
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],
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),
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),
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)
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else
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_TimelineGrid(entries: timeline),
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],
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),
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),
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);
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}
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}
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class _TimelineGrid extends StatelessWidget {
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const _TimelineGrid({required this.entries});
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final List<LocoAttrVersion> entries;
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@override
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Widget build(BuildContext context) {
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final model = _TimelineModel.fromEntries(entries);
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final axisSegments = model.axisSegments;
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const labelWidth = 150.0;
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const rowHeight = 52.0;
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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mainAxisSize: MainAxisSize.min,
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children: [
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Scrollbar(
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thumbVisibility: true,
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child: SingleChildScrollView(
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scrollDirection: Axis.horizontal,
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child: IntrinsicWidth(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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mainAxisSize: MainAxisSize.min,
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children: [
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_AxisRow(
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labelWidth: labelWidth,
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segments: axisSegments,
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endLabel: model.endLabel,
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),
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const SizedBox(height: 8),
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...model.attrRows.entries.map(
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(entry) => Padding(
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padding: const EdgeInsets.symmetric(vertical: 2.0),
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child: _AttrRow(
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labelWidth: labelWidth,
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rowHeight: rowHeight,
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attrLabel: _formatAttrLabel(entry.key),
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cells: entry.value,
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segments: axisSegments,
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),
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),
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),
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],
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),
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),
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),
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),
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const SizedBox(height: 14),
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Text(
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'Dates mark when a value changed. The right edge of the last block is “Now” if no end date is present.',
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style: Theme.of(context).textTheme.labelMedium,
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),
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],
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);
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}
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}
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class _AxisRow extends StatelessWidget {
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const _AxisRow({
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required this.labelWidth,
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required this.segments,
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required this.endLabel,
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});
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final double labelWidth;
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final List<_AxisSegment> segments;
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final String endLabel;
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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return Row(
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crossAxisAlignment: CrossAxisAlignment.start,
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mainAxisSize: MainAxisSize.min,
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children: [
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SizedBox(
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width: labelWidth,
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height: 36,
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child: Align(
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alignment: Alignment.centerLeft,
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child: Text(
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'Date',
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style: theme.textTheme.labelLarge?.copyWith(
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fontWeight: FontWeight.w700,
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),
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),
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),
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),
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...segments.asMap().entries.map(
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(entry) {
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final i = entry.key;
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final seg = entry.value;
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final isLast = i == segments.length - 1;
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return SizedBox(
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width: seg.width,
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height: 36,
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child: Stack(
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children: [
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Align(
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alignment: Alignment.centerLeft,
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child: Text(
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seg.label,
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style: theme.textTheme.labelSmall,
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),
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),
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if (isLast)
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Align(
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alignment: Alignment.centerRight,
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child: Text(
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endLabel,
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style: theme.textTheme.labelSmall,
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),
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),
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],
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),
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);
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},
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),
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],
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);
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}
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}
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class _AttrRow extends StatelessWidget {
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const _AttrRow({
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required this.labelWidth,
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required this.rowHeight,
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required this.attrLabel,
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required this.cells,
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required this.segments,
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});
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final double labelWidth;
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final double rowHeight;
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final String attrLabel;
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final List<_RowCell> cells;
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final List<_AxisSegment> segments;
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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return Row(
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crossAxisAlignment: CrossAxisAlignment.center,
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mainAxisSize: MainAxisSize.min,
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children: [
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Container(
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width: labelWidth,
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height: rowHeight,
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padding: const EdgeInsets.symmetric(horizontal: 10),
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alignment: Alignment.centerLeft,
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decoration: BoxDecoration(
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color: theme.colorScheme.surfaceContainerHighest,
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borderRadius: BorderRadius.circular(10),
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),
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child: Text(
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attrLabel,
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style: theme.textTheme.labelLarge?.copyWith(
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fontWeight: FontWeight.w700,
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),
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),
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),
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...segments.asMap().entries.map((entry) {
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final idx = entry.key;
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final seg = entry.value;
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final cell = cells[idx];
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final hasValue = cell.value.isNotEmpty;
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final textColor = ThemeData.estimateBrightnessForColor(
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cell.color.withOpacity(0.9),
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) ==
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Brightness.dark
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? Colors.white
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: Colors.black87;
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return Container(
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width: seg.width,
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height: rowHeight,
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padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
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decoration: BoxDecoration(
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color: hasValue
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? cell.color.withOpacity(0.9)
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: theme.colorScheme.surfaceContainerHighest,
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borderRadius: BorderRadius.circular(12),
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border: Border.all(
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color: theme.colorScheme.outlineVariant,
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),
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),
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child: hasValue
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? Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Text(
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cell.value,
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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style: theme.textTheme.bodyMedium?.copyWith(
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fontWeight: FontWeight.w700,
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color: textColor,
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) ??
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TextStyle(
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fontWeight: FontWeight.w700,
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color: textColor,
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),
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),
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const SizedBox(height: 4),
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Text(
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cell.rangeLabel,
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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style: theme.textTheme.labelSmall?.copyWith(
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color: textColor.withOpacity(0.9),
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) ??
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TextStyle(color: textColor.withOpacity(0.9)),
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),
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],
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)
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: const SizedBox.shrink(),
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);
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}),
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],
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);
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}
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}
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final DateFormat _dateFormat = DateFormat('yyyy-MM-dd');
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String? _formatDate(DateTime? date) {
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if (date == null) return null;
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return _dateFormat.format(date);
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}
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String _formatAttrLabel(String code) {
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if (code.isEmpty) return 'Attribute';
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final parts = code.split('_').where((p) => p.isNotEmpty).toList();
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if (parts.isEmpty) return code;
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return parts
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.map((part) => part.length == 1
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? part.toUpperCase()
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: part[0].toUpperCase() + part.substring(1))
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.join(' ');
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}
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DateTime? _parseDateString(String? value) {
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if (value == null || value.isEmpty) return null;
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return DateTime.tryParse(value);
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}
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DateTime? _effectiveStart(LocoAttrVersion entry) {
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return entry.validFrom ??
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_parseDateString(entry.maskedValidFrom) ??
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entry.txnFrom;
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}
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DateTime _safeEnd(DateTime start, DateTime? end) {
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if (end == null || !end.isAfter(start)) {
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return start.add(const Duration(days: 1));
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}
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return end;
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}
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class _TimelineModel {
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final List<_AxisSegment> axisSegments;
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final Map<String, List<_RowCell>> attrRows;
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final String endLabel;
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_TimelineModel({
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required this.axisSegments,
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required this.attrRows,
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required this.endLabel,
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});
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factory _TimelineModel.fromEntries(List<LocoAttrVersion> entries) {
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final grouped = <String, List<LocoAttrVersion>>{};
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for (final entry in entries) {
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grouped.putIfAbsent(entry.attrCode, () => []).add(entry);
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}
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final now = DateTime.now();
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DateTime? minStart;
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DateTime? maxEnd;
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final attrSegments = <String, List<_ValueSegment>>{};
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grouped.forEach((attr, items) {
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items.sort(
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(a, b) => (_effectiveStart(a) ?? now)
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.compareTo(_effectiveStart(b) ?? now),
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);
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final segments = <_ValueSegment>[];
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for (int i = 0; i < items.length; i++) {
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final entry = items[i];
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final start = _effectiveStart(entry) ?? now;
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final nextStart = i < items.length - 1
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? _effectiveStart(items[i + 1])
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: null;
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final rawEnd = entry.validTo ?? nextStart ?? now;
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final end = _safeEnd(start, rawEnd);
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segments.add(
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_ValueSegment(
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start: start,
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end: end,
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value: entry.valueLabel,
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entry: entry,
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),
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);
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minStart = minStart == null || start.isBefore(minStart!)
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? start
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: minStart;
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maxEnd = maxEnd == null || end.isAfter(maxEnd!) ? end : maxEnd;
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}
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attrSegments[attr] = segments;
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});
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minStart ??= now.subtract(const Duration(days: 1));
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maxEnd ??= now;
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final boundaryDates = <DateTime>{};
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for (final segments in attrSegments.values) {
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for (final seg in segments) {
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boundaryDates.add(seg.start);
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}
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}
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boundaryDates.add(maxEnd);
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var boundaries = boundaryDates.toList()..sort();
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if (boundaries.length < 2) {
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boundaries = [minStart!, maxEnd];
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}
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final axisSegments = <_AxisSegment>[];
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const pxPerDay = 4.0;
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for (int i = 0; i < boundaries.length - 1; i++) {
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final start = boundaries[i];
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final end = boundaries[i + 1];
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final days = (end.difference(start).inDays).clamp(1, 365);
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final width = (days * pxPerDay) + 30;
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axisSegments.add(
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_AxisSegment(
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start: start,
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end: end,
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width: width,
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label: _formatDate(start) ?? '',
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),
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);
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}
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final attrRows = <String, List<_RowCell>>{};
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for (final entry in attrSegments.entries) {
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final cells = <_RowCell>[];
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for (final axis in axisSegments) {
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final seg = entry.value
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.firstWhere(
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(s) => s.overlaps(axis.start, axis.end),
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orElse: () => _ValueSegment.empty(axis.start, axis.end),
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);
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cells.add(_RowCell.fromSegment(seg));
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}
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attrRows[entry.key] = cells;
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}
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final endLabel = _formatDate(maxEnd) ?? 'Now';
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return _TimelineModel(
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axisSegments: axisSegments,
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attrRows: attrRows,
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endLabel: endLabel,
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);
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}
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}
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class _AxisSegment {
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final DateTime start;
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final DateTime end;
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final double width;
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final String label;
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_AxisSegment({
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required this.start,
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required this.end,
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required this.width,
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required this.label,
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});
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}
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class _ValueSegment {
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final DateTime start;
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final DateTime end;
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final String value;
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final LocoAttrVersion? entry;
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_ValueSegment({
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required this.start,
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required this.end,
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required this.value,
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this.entry,
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});
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factory _ValueSegment.empty(DateTime start, DateTime end) => _ValueSegment(
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start: start,
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end: end,
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value: '',
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entry: null,
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);
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bool overlaps(DateTime s, DateTime e) {
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return start.isBefore(e) && end.isAfter(s);
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}
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}
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class _RowCell {
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final String value;
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final String rangeLabel;
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final Color color;
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const _RowCell({
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required this.value,
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required this.rangeLabel,
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required this.color,
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});
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factory _RowCell.fromSegment(_ValueSegment seg) {
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if (seg.value.isEmpty) {
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return const _RowCell(
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value: '',
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rangeLabel: '',
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color: Colors.transparent,
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);
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}
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final displayStart = _formatDate(seg.start) ?? '';
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final displayEnd = _formatDate(seg.entry?.validTo ?? seg.end) ?? 'Now';
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final range = '$displayStart → $displayEnd';
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return _RowCell(
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value: seg.value,
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rangeLabel: range,
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color: _colorForValue(seg.value),
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);
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}
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}
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Color _colorForValue(String value) {
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final hue = (value.hashCode % 360).toDouble();
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final hsl = HSLColor.fromAHSL(1, hue, 0.55, 0.55);
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return hsl.toColor();
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}
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