// RunTab — the third tab. Shows:
//
//   1. A form for the flow's declared inputs (one field per
//      `inputs:` entry). Text inputs use a TextField; bytes
//      inputs use a "Choose file…" button + filename badge.
//
//   2. A Start button that calls the host's FlowRunDriver
//      with the collected inputs.
//
//   3. A live step list driven by the driver's event stream,
//      identical visually to the CLI's `fai run` block:
//      ◻ pending, · running, ✔ done + duration, ✗ failed,
//      ⏸ awaiting approval.
//
//   4. The flow's outputs once the run resolves.
//
// The tab requires the file to be saved on disk — the hub's
// runSavedFlow reads from `~/.chain/data/flows/<name>.yaml`,
// not from the in-memory buffer. The dirty banner reminds
// the operator to save before running so they don't run a
// stale version by surprise.

import 'dart:async';
import 'dart:io';

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

import '../editor_controller.dart';
import '../l10n.dart';
import '../model/flow_graph.dart';
import '../run_driver.dart';
import '../tokens.dart';

class RunTab extends StatefulWidget {
  final FlowEditorController controller;
  final FlowEditorStrings strings;
  final FlowRunDriver? driver;
  const RunTab({
    super.key,
    required this.controller,
    required this.strings,
    this.driver,
  });

  @override
  State<RunTab> createState() => _RunTabState();
}

class _RunTabState extends State<RunTab> {
  final Map<String, TextEditingController> _textInputs = {};
  final Map<String, _FilePick> _fileInputs = {};

  StreamSubscription<FlowRunEvent>? _eventSub;
  bool _running = false;
  Map<String, FlowOutputValue>? _outputs;
  Object? _error;
  // Insertion-ordered: shows steps in the order the hub
  // actually started them, matching the CLI rendering.
  final Map<String, _StepState> _liveSteps = {};
  String? _runFlowName;

  @override
  void initState() {
    super.initState();
    widget.controller.addListener(_onControllerChanged);
    _syncInputs();
  }

  @override
  void dispose() {
    widget.controller.removeListener(_onControllerChanged);
    _eventSub?.cancel();
    for (final c in _textInputs.values) {
      c.dispose();
    }
    super.dispose();
  }

  void _onControllerChanged() {
    if (!mounted) return;
    _syncInputs();
    setState(() {});
  }

  void _syncInputs() {
    final graph = widget.controller.graph;
    final keep = <String>{};
    for (final entry in graph.inputs.entries) {
      keep.add(entry.key);
      if (entry.value.type == 'bytes' || entry.value.type == 'file') {
        // bytes input — keep its file pick if already chosen.
        _fileInputs.putIfAbsent(entry.key, () => const _FilePick.empty());
      } else {
        _textInputs.putIfAbsent(
          entry.key,
          () => TextEditingController(text: entry.value.defaultValue ?? ''),
        );
      }
    }
    // Drop controllers for inputs that no longer exist.
    _textInputs.removeWhere((k, c) {
      if (keep.contains(k)) return false;
      c.dispose();
      return true;
    });
    _fileInputs.removeWhere((k, _) => !keep.contains(k));
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final controller = widget.controller;
    final strings = widget.strings;
    if (controller.activeName == null) {
      return _empty(theme, strings.runNoFlow);
    }
    final graph = controller.graph;
    return Container(
      color: theme.colorScheme.surface,
      child: ListView(
        padding: const EdgeInsets.all(FaiSpace.lg),
        children: [
          _titleRow(theme),
          const SizedBox(height: FaiSpace.md),
          if (controller.isDirty)
            Container(
              padding: const EdgeInsets.all(FaiSpace.sm),
              margin: const EdgeInsets.only(bottom: FaiSpace.md),
              decoration: BoxDecoration(
                color: theme.colorScheme.tertiaryContainer,
                borderRadius: BorderRadius.circular(FaiRadius.sm),
              ),
              child: Row(
                children: [
                  Icon(
                    Icons.info_outline,
                    size: 16,
                    color: theme.colorScheme.onTertiaryContainer,
                  ),
                  const SizedBox(width: FaiSpace.sm),
                  Expanded(
                    child: Text(
                      strings.runUnsavedBanner,
                      style: theme.textTheme.bodySmall?.copyWith(
                        color: theme.colorScheme.onTertiaryContainer,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          _section(theme, strings.runInputs),
          if (graph.inputs.isEmpty)
            Padding(
              padding: const EdgeInsets.symmetric(vertical: FaiSpace.sm),
              child: Text(
                '—',
                style: theme.textTheme.bodySmall?.copyWith(
                  color: theme.colorScheme.onSurfaceVariant,
                ),
              ),
            )
          else
            for (final entry in graph.inputs.entries)
              _inputField(theme, entry.key, entry.value),
          const SizedBox(height: FaiSpace.md),
          _startButtonRow(theme, strings),
          if (_liveSteps.isNotEmpty || _running) ...[
            const SizedBox(height: FaiSpace.lg),
            _section(
              theme,
              _running ? strings.runTitleRunning : strings.runTitleDone,
            ),
            _stepList(theme),
          ],
          if (_outputs != null) ...[
            const SizedBox(height: FaiSpace.lg),
            _section(theme, strings.runOutputs),
            for (final entry in _outputs!.entries)
              _outputRow(theme, entry.key, entry.value),
          ],
          if (_error != null) ...[
            const SizedBox(height: FaiSpace.lg),
            _section(theme, strings.runTitleFailed),
            _CopyableErrorBox(
              text: _error.toString(),
              strings: widget.strings,
            ),
          ],
        ],
      ),
    );
  }

  Widget _titleRow(ThemeData theme) {
    final title = _running
        ? widget.strings.runTitleRunning
        : _error != null
        ? widget.strings.runTitleFailed
        : _outputs != null
        ? widget.strings.runTitleDone
        : widget.strings.runTitleIdle;
    return Text(
      title,
      style: theme.textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600),
    );
  }

  Widget _section(ThemeData theme, String label) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 4),
      child: Text(
        label,
        style: theme.textTheme.labelSmall?.copyWith(
          color: theme.colorScheme.onSurfaceVariant,
          letterSpacing: 0.6,
        ),
      ),
    );
  }

  Widget _empty(ThemeData theme, String hint) {
    return Container(
      color: theme.colorScheme.surface,
      padding: const EdgeInsets.all(FaiSpace.lg),
      child: Center(
        child: Text(
          hint,
          textAlign: TextAlign.center,
          style: theme.textTheme.bodySmall?.copyWith(
            color: theme.colorScheme.onSurfaceVariant,
          ),
        ),
      ),
    );
  }

  Widget _inputField(ThemeData theme, String name, FlowInput input) {
    final type = input.type;
    if (type == 'bytes' || type == 'file') {
      final pick = _fileInputs[name] ?? const _FilePick.empty();
      return Padding(
        padding: const EdgeInsets.symmetric(vertical: FaiSpace.xs),
        child: Row(
          children: [
            SizedBox(
              width: 140,
              child: Text(
                '$name ($type)',
                style: const TextStyle(fontFamily: 'monospace'),
              ),
            ),
            const SizedBox(width: FaiSpace.sm),
            OutlinedButton.icon(
              onPressed: () => _pickFile(name),
              icon: const Icon(Icons.attach_file, size: 16),
              label: Text(
                pick.fileName ?? widget.strings.runChooseFile,
                overflow: TextOverflow.ellipsis,
              ),
            ),
          ],
        ),
      );
    }
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: FaiSpace.xs),
      child: Row(
        children: [
          SizedBox(
            width: 140,
            child: Text(
              '$name ($type)',
              style: const TextStyle(fontFamily: 'monospace'),
            ),
          ),
          const SizedBox(width: FaiSpace.sm),
          Expanded(
            child: TextField(
              controller: _textInputs[name],
              style: const TextStyle(fontFamily: 'monospace', fontSize: 13),
              decoration: InputDecoration(
                hintText: input.hint,
                isDense: true,
                border: const OutlineInputBorder(),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _stepList(ThemeData theme) {
    final entries = _liveSteps.entries.toList();
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        for (final entry in entries) _stepRow(theme, entry.key, entry.value),
      ],
    );
  }

  Widget _stepRow(ThemeData theme, String id, _StepState state) {
    final strings = widget.strings;
    final IconData glyph;
    final Color color;
    String suffix = '';
    switch (state.kind) {
      case _StepKind.running:
        glyph = Icons.refresh;
        color = theme.colorScheme.primary;
      case _StepKind.done:
        glyph = Icons.check;
        color = Colors.green.shade600;
        suffix = '  ${(state.durationMs ?? 0) / 1000.0}s';
      case _StepKind.error:
        glyph = Icons.close;
        color = theme.colorScheme.error;
      case _StepKind.awaiting:
        glyph = Icons.pause_circle_outline;
        color = theme.colorScheme.tertiary;
        suffix = '  ${strings.runAwaitingApproval}';
    }
    final isError = state.kind == _StepKind.error &&
        state.error != null &&
        state.error!.isNotEmpty;
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 2),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(glyph, size: 16, color: color),
              const SizedBox(width: FaiSpace.sm),
              Flexible(
                child: SelectableText(
                  '$id$suffix',
                  style: TextStyle(
                    fontFamily: 'monospace',
                    fontSize: 13,
                    color: color,
                  ),
                ),
              ),
            ],
          ),
          if (isError) ...[
            const SizedBox(height: 4),
            Padding(
              padding: const EdgeInsets.only(left: 24),
              child: _CopyableErrorBox(
                text: state.error!,
                strings: widget.strings,
              ),
            ),
          ],
          if (state.kind == _StepKind.awaiting) ...[
            const SizedBox(height: 6),
            Padding(
              padding: const EdgeInsets.only(left: 24),
              child: _InlineApprovalCard(
                stepId: id,
                flowName: _runFlowName ?? '',
                driver: widget.driver,
                strings: widget.strings,
                onDecided: () {
                  // After approve/reject the hub keeps polling
                  // and either resumes the flow or fails it; the
                  // event stream surfaces the outcome. Nothing to
                  // do here besides redraw so the buttons go away.
                  if (mounted) setState(() {});
                },
              ),
            ),
          ],
        ],
      ),
    );
  }

  /// Run button row. Disabled when the buffer carries analyzer
  /// errors — an info chip next to the button names the count
  /// and (when collapsed) the first message so the operator
  /// sees the blocker without scrolling to the bottom strip.
  Widget _startButtonRow(ThemeData theme, FlowEditorStrings strings) {
    final errors = widget.controller.analyzerErrorCount;
    final blocked = errors > 0;
    return Row(
      children: [
        Tooltip(
          message: blocked ? strings.runErrorsBlockTooltip(errors) : '',
          child: FilledButton.icon(
            onPressed: _running || widget.driver == null || blocked
                ? null
                : _start,
            icon: _running
                ? const SizedBox(
                    width: 14,
                    height: 14,
                    child: CircularProgressIndicator(strokeWidth: 2),
                  )
                : Icon(
                    blocked ? Icons.block : Icons.play_arrow,
                    size: 18,
                  ),
            label: Text(strings.runStart),
          ),
        ),
        if (blocked) ...[
          const SizedBox(width: FaiSpace.sm),
          Flexible(
            child: Text(
              '${strings.runErrorsBlockRun(errors)} · '
              '${strings.runErrorsBlockHint}',
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.error,
              ),
              overflow: TextOverflow.ellipsis,
            ),
          ),
        ],
      ],
    );
  }

  Widget _outputRow(ThemeData theme, String name, FlowOutputValue value) {
    return Padding(
      padding: const EdgeInsets.only(bottom: FaiSpace.sm),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            name.toUpperCase(),
            style: theme.textTheme.labelSmall?.copyWith(
              color: theme.colorScheme.onSurfaceVariant,
              letterSpacing: 0.6,
            ),
          ),
          const SizedBox(height: 2),
          _outputBody(theme, value),
        ],
      ),
    );
  }

  Widget _outputBody(ThemeData theme, FlowOutputValue value) {
    if (value is FlowOutputText) {
      return SelectableText(
        value.value,
        style: const TextStyle(fontFamily: 'monospace', fontSize: 12),
      );
    }
    if (value is FlowOutputJson) {
      return SelectableText(
        value.value.toString(),
        style: const TextStyle(fontFamily: 'monospace', fontSize: 12),
      );
    }
    if (value is FlowOutputBytes) {
      return Text(
        '${value.value.length} bytes · ${value.mimeType}',
        style: theme.textTheme.bodySmall,
      );
    }
    return const SizedBox.shrink();
  }

  Future<void> _pickFile(String name) async {
    // For 0.2.0 the editor relies on the host to inject a
    // file-picker via callback; minimal version uses
    // dart:io directly for desktop. Studio uses file_picker;
    // we fall back to a manual path entry dialog if no host
    // picker is available.
    final controller = TextEditingController();
    final ctx = context;
    final result = await showDialog<String>(
      context: ctx,
      builder: (_) => AlertDialog(
        title: Text(widget.strings.runChooseFile),
        content: TextField(
          controller: controller,
          decoration: const InputDecoration(
            hintText: '/path/to/file',
            border: OutlineInputBorder(),
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx, null),
            child: Text(widget.strings.newDialogCancel),
          ),
          TextButton(
            onPressed: () => Navigator.pop(ctx, controller.text.trim()),
            child: const Text('OK'),
          ),
        ],
      ),
    );
    if (result == null || result.isEmpty || !mounted) return;
    try {
      final file = File(result);
      if (!file.existsSync()) return;
      final bytes = await file.readAsBytes();
      setState(() {
        _fileInputs[name] = _FilePick(
          fileName: file.uri.pathSegments.last,
          bytes: Uint8List.fromList(bytes),
        );
      });
    } catch (_) {
      // swallow — file unreadable, leave the pick empty
    }
  }

  Future<void> _start() async {
    final driver = widget.driver;
    if (driver == null) return;
    final flowName = widget.controller.activeName;
    if (flowName == null) return;
    setState(() {
      _running = true;
      _outputs = null;
      _error = null;
      _liveSteps.clear();
      _runFlowName = flowName;
    });
    widget.controller.running = true;
    // Subscribe BEFORE submitting so the first event isn't
    // lost to the broadcast's dead-letter.
    _eventSub?.cancel();
    _eventSub = driver.events().listen(_onEvent);
    final textInputs = <String, String>{
      for (final entry in _textInputs.entries) entry.key: entry.value.text,
    };
    final fileInputs = <String, Uint8List>{};
    final fileMimes = <String, String>{};
    for (final entry in _fileInputs.entries) {
      final bytes = entry.value.bytes;
      if (bytes == null) continue;
      fileInputs[entry.key] = bytes;
      fileMimes[entry.key] = _mimeFor(entry.value.fileName ?? '');
    }
    try {
      final outputs = await driver.runFlow(
        flowName: flowName,
        textInputs: textInputs,
        fileInputs: fileInputs,
        fileMimes: fileMimes,
      );
      if (!mounted) return;
      setState(() {
        _running = false;
        _outputs = outputs;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _running = false;
        _error = e;
      });
    } finally {
      widget.controller.running = false;
      _eventSub?.cancel();
      _eventSub = null;
    }
  }

  void _onEvent(FlowRunEvent event) {
    final flowName = _runFlowName;
    if (flowName == null) return;
    if (event.flowName != flowName) return;
    if (!mounted) return;
    setState(() {
      switch (event) {
        case StepStarted():
          _liveSteps[event.stepId] = const _StepState(kind: _StepKind.running);
          widget.controller.updateStepStatus(
            event.stepId,
            StepRunStatus.running,
          );
        case StepCompleted():
          _liveSteps[event.stepId] = _StepState(
            kind: _StepKind.done,
            durationMs: event.durationMs,
          );
          widget.controller.updateStepStatus(event.stepId, StepRunStatus.done);
        case StepFailed():
          _liveSteps[event.stepId] = _StepState(
            kind: _StepKind.error,
            error: event.error,
          );
          widget.controller.updateStepStatus(
            event.stepId,
            StepRunStatus.failed,
          );
        case StepAwaitingApproval():
          _liveSteps[event.stepId] = const _StepState(kind: _StepKind.awaiting);
          widget.controller.updateStepStatus(
            event.stepId,
            StepRunStatus.awaiting,
          );
      }
    });
  }

  String _mimeFor(String name) {
    final lower = name.toLowerCase();
    if (lower.endsWith('.pdf')) return 'application/pdf';
    if (lower.endsWith('.docx')) {
      return 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
    }
    if (lower.endsWith('.txt')) return 'text/plain';
    if (lower.endsWith('.json')) return 'application/json';
    return 'application/octet-stream';
  }
}

class _FilePick {
  final String? fileName;
  final Uint8List? bytes;
  const _FilePick({this.fileName, this.bytes});
  const _FilePick.empty() : fileName = null, bytes = null;
}

enum _StepKind { running, done, error, awaiting }

class _StepState {
  final _StepKind kind;
  final int? durationMs;
  final String? error;
  const _StepState({required this.kind, this.durationMs, this.error});
}

/// Selectable error box used for the run-failure detail + the
/// per-step failure detail. SelectableText + an explicit Copy
/// button cover both keyboard and trackpad operators — the
/// implicit selection gesture is too easy to miss on a long
/// failure message. Matches the visual treatment Studio's
/// `ChainErrorBox` uses elsewhere; kept local to this package
/// so flow_editor doesn't depend on Studio internals.
class _CopyableErrorBox extends StatefulWidget {
  final String text;
  final FlowEditorStrings strings;
  const _CopyableErrorBox({required this.text, required this.strings});

  @override
  State<_CopyableErrorBox> createState() => _CopyableErrorBoxState();
}

class _CopyableErrorBoxState extends State<_CopyableErrorBox> {
  bool _justCopied = false;

  Future<void> _copy() async {
    await Clipboard.setData(ClipboardData(text: widget.text));
    if (!mounted) return;
    setState(() => _justCopied = true);
    Future.delayed(const Duration(seconds: 2), () {
      if (mounted) setState(() => _justCopied = false);
    });
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Container(
      width: double.infinity,
      padding: const EdgeInsets.fromLTRB(
        FaiSpace.sm,
        FaiSpace.xs,
        FaiSpace.xs,
        FaiSpace.sm,
      ),
      decoration: BoxDecoration(
        color: theme.colorScheme.errorContainer,
        borderRadius: BorderRadius.circular(FaiRadius.sm),
        border: Border.all(
          color: theme.colorScheme.error.withValues(alpha: 0.4),
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          Align(
            alignment: Alignment.centerRight,
            child: Tooltip(
              message:
                  _justCopied ? widget.strings.runCopied : widget.strings.runCopy,
              child: IconButton(
                icon: Icon(
                  _justCopied ? Icons.check : Icons.content_copy,
                  size: 14,
                ),
                visualDensity: VisualDensity.compact,
                padding: const EdgeInsets.all(4),
                constraints: const BoxConstraints(),
                onPressed: _copy,
              ),
            ),
          ),
          ConstrainedBox(
            constraints: const BoxConstraints(maxHeight: 220),
            child: Scrollbar(
              child: SingleChildScrollView(
                child: SelectableText(
                  widget.text,
                  style: TextStyle(
                    fontFamily: 'JetBrains Mono',
                    fontFamilyFallback: const [
                      'Menlo',
                      'Consolas',
                      'Courier New',
                      'monospace',
                    ],
                    fontSize: 12,
                    color: theme.colorScheme.onErrorContainer,
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

/// Inline Approve / Reject card rendered under a step that
/// the hub has paused on `system.approval@^0`. Removes the
/// "go to the Approvals page" detour the operator otherwise
/// has to take — the same decision can happen in-context while
/// the rest of the run is on screen.
///
/// Lifecycle:
///   1. Card mounts in awaiting-state with a fetch-in-flight
///      indicator.
///   2. Driver returns the pending approval id for this
///      (flowName, stepId) pair. Card switches to the Approve /
///      Reject form.
///   3. Operator submits a decision. Card disables further
///      interaction and waits — the next event (step.approved /
///      step.rejected) is what causes the hub to resume the
///      flow, and the StepStarted/StepFailed event will redraw
///      the parent step row + remove this card.
class _InlineApprovalCard extends StatefulWidget {
  final String stepId;
  final String flowName;
  final FlowRunDriver? driver;
  final FlowEditorStrings strings;
  final VoidCallback onDecided;

  const _InlineApprovalCard({
    required this.stepId,
    required this.flowName,
    required this.driver,
    required this.strings,
    required this.onDecided,
  });

  @override
  State<_InlineApprovalCard> createState() => _InlineApprovalCardState();
}

class _InlineApprovalCardState extends State<_InlineApprovalCard> {
  String? _approvalId;
  bool _fetching = true;
  bool _submitting = false;
  bool _submitted = false;
  String? _error;
  late final TextEditingController _reasonCtrl;
  late final TextEditingController _reviewerCtrl;

  @override
  void initState() {
    super.initState();
    _reasonCtrl = TextEditingController();
    _reviewerCtrl = TextEditingController(text: _defaultReviewer());
    _fetch();
  }

  @override
  void dispose() {
    _reasonCtrl.dispose();
    _reviewerCtrl.dispose();
    super.dispose();
  }

  String _defaultReviewer() {
    final user = Platform.environment['USER'] ??
        Platform.environment['USERNAME'] ??
        'studio';
    return '$user@studio';
  }

  Future<void> _fetch() async {
    final driver = widget.driver;
    if (driver == null) {
      setState(() => _fetching = false);
      return;
    }
    // The hub creates the approval row when the flow hits the
    // awaiting state. Race against the event arrival: poll up
    // to 5 × 600 ms before giving up.
    for (var i = 0; i < 5; i++) {
      try {
        final id = await driver.pendingApprovalIdForStep(
          flowName: widget.flowName,
          stepId: widget.stepId,
        );
        if (!mounted) return;
        if (id != null) {
          setState(() {
            _approvalId = id;
            _fetching = false;
          });
          return;
        }
      } catch (e) {
        if (!mounted) return;
        setState(() {
          _error = e.toString();
          _fetching = false;
        });
        return;
      }
      await Future.delayed(const Duration(milliseconds: 600));
    }
    if (mounted) setState(() => _fetching = false);
  }

  Future<void> _decide({required bool approve}) async {
    final id = _approvalId;
    final driver = widget.driver;
    if (id == null || driver == null) return;
    setState(() => _submitting = true);
    try {
      if (approve) {
        await driver.approveApproval(
          approvalId: id,
          reviewer: _reviewerCtrl.text.trim(),
        );
      } else {
        await driver.rejectApproval(
          approvalId: id,
          reviewer: _reviewerCtrl.text.trim(),
          reason: _reasonCtrl.text.trim(),
        );
      }
      if (!mounted) return;
      setState(() {
        _submitted = true;
        _submitting = false;
      });
      widget.onDecided();
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _error = e.toString();
        _submitting = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final strings = widget.strings;
    return Container(
      padding: const EdgeInsets.all(FaiSpace.sm),
      decoration: BoxDecoration(
        color: theme.colorScheme.tertiaryContainer.withValues(alpha: 0.5),
        borderRadius: BorderRadius.circular(FaiRadius.sm),
        border: Border.all(
          color: theme.colorScheme.tertiary.withValues(alpha: 0.4),
        ),
      ),
      child: _fetching
          ? Row(
              children: [
                const SizedBox(
                  width: 14,
                  height: 14,
                  child: CircularProgressIndicator(strokeWidth: 2),
                ),
                const SizedBox(width: FaiSpace.sm),
                Text(strings.runAwaitingApproval),
              ],
            )
          : _submitted
              ? Row(
                  children: [
                    Icon(
                      Icons.check_circle_outline,
                      size: 16,
                      color: theme.colorScheme.tertiary,
                    ),
                    const SizedBox(width: FaiSpace.sm),
                    Flexible(child: Text(strings.approvalDecided)),
                  ],
                )
              : _approvalId == null
                  ? Row(
                      children: [
                        Icon(
                          Icons.hourglass_empty,
                          size: 16,
                          color: theme.colorScheme.onSurfaceVariant,
                        ),
                        const SizedBox(width: FaiSpace.sm),
                        Flexible(
                          child: Text(
                            _error ?? strings.approvalNotFound,
                            style: theme.textTheme.bodySmall,
                          ),
                        ),
                      ],
                    )
                  : Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Row(
                          children: [
                            Expanded(
                              child: TextField(
                                controller: _reviewerCtrl,
                                decoration: InputDecoration(
                                  labelText: strings.approvalReviewerLabel,
                                  border: const OutlineInputBorder(),
                                  isDense: true,
                                ),
                              ),
                            ),
                            const SizedBox(width: FaiSpace.md),
                            Expanded(
                              flex: 2,
                              child: TextField(
                                controller: _reasonCtrl,
                                decoration: InputDecoration(
                                  labelText: strings.approvalReasonLabel,
                                  border: const OutlineInputBorder(),
                                  isDense: true,
                                ),
                              ),
                            ),
                          ],
                        ),
                        if (_error != null) ...[
                          const SizedBox(height: FaiSpace.sm),
                          Text(
                            _error!,
                            style: theme.textTheme.bodySmall?.copyWith(
                              color: theme.colorScheme.error,
                            ),
                          ),
                        ],
                        const SizedBox(height: FaiSpace.sm),
                        Row(
                          children: [
                            FilledButton.icon(
                              onPressed: _submitting
                                  ? null
                                  : () => _decide(approve: true),
                              icon: const Icon(Icons.check, size: 16),
                              label: Text(
                                _submitting
                                    ? strings.approvalSubmitting
                                    : strings.approvalApprove,
                              ),
                            ),
                            const SizedBox(width: FaiSpace.sm),
                            OutlinedButton.icon(
                              onPressed: _submitting
                                  ? null
                                  : () => _decide(approve: false),
                              icon: const Icon(Icons.close, size: 16),
                              label: Text(strings.approvalReject),
                            ),
                          ],
                        ),
                      ],
                    ),
    );
  }
}