// Tests for FlowYamlCodeController's type-token recolouring.
//
// The controller post-processes the YAML highlighter's span
// tree to recolour any `key: <type>` value where the value is
// one of `text|json|bytes|file|number|integer` and the key sits
// at an indented depth (so top-level `name: text` doesn't
// false-match). We can't easily inspect TextSpan colours without
// rendering, so the tests below render the controller into a
// CodeField inside a TestWidget tree and walk the produced
// span tree.

import 'package:chain_studio_flow_editor/src/flow_yaml_controller.dart';
import 'package:chain_studio_flow_editor/src/wire_colors.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  group('FlowYamlCodeController type-token recoloring', () {
    testWidgets('colours indented `field: bytes` value with bytes wire hue', (
      tester,
    ) async {
      final c = FlowYamlCodeController();
      addTearDown(c.dispose);
      c.fullText = '''
inputs:
  document: bytes
''';
      late TextSpan span;
      late ThemeData theme;
      await tester.pumpWidget(
        MaterialApp(
          home: Builder(
            builder: (context) {
              theme = Theme.of(context);
              span = c.buildTextSpan(context: context, withComposing: false);
              return const SizedBox();
            },
          ),
        ),
      );
      // Let CodeController's 500ms analyzer debounce fire so
      // the test teardown isn't blocked by a pending timer.
      await tester.pump(const Duration(seconds: 1));

      final tokens = _flattenLeaves(span);
      // Find the leaf whose text is the word "bytes" and assert
      // it carries the wire-bytes colour from the shared palette.
      final bytesLeaf = tokens.firstWhere(
        (t) => t.text == 'bytes',
        orElse: () => const _Leaf('', null),
      );
      expect(bytesLeaf.text, 'bytes', reason: 'expected a "bytes" leaf');
      final expected = wireColor('bytes', theme);
      expect(bytesLeaf.style?.color, expected);
      expect(bytesLeaf.style?.fontWeight, FontWeight.w600);
    });

    testWidgets('does NOT recolour top-level `name: text` (not indented)', (
      tester,
    ) async {
      final c = FlowYamlCodeController();
      addTearDown(c.dispose);
      // The flow's top-level `name: hello` is also not a type
      // declaration; we use `text` here to make the trap
      // explicit. The leading `name:` is at column 0 — not
      // indented — so the recolour must skip it.
      c.fullText = 'name: text\n';
      late TextSpan span;
      late ThemeData theme;
      await tester.pumpWidget(
        MaterialApp(
          home: Builder(
            builder: (context) {
              theme = Theme.of(context);
              span = c.buildTextSpan(context: context, withComposing: false);
              return const SizedBox();
            },
          ),
        ),
      );
      // Let CodeController's 500ms analyzer debounce fire so
      // the test teardown isn't blocked by a pending timer.
      await tester.pump(const Duration(seconds: 1));

      final tokens = _flattenLeaves(span);
      final textLeaf = tokens.firstWhere(
        (t) => t.text == 'text',
        orElse: () => const _Leaf('', null),
      );
      // At top level the highlighter does paint it as a string
      // (green-ish, palette-derived), but it must NOT match the
      // explicit wire-text hue + 600 weight combo our recolour
      // applies — that's the signal we'd be incorrectly tagging
      // it as a type declaration.
      final wireText = wireColor('text', theme);
      final isRecoloured =
          textLeaf.style?.color == wireText &&
          textLeaf.style?.fontWeight == FontWeight.w600;
      expect(
        isRecoloured,
        isFalse,
        reason: 'top-level `name: text` must not be flagged as a type decl',
      );
    });

    testWidgets('colours `type: text` value (explicit-type module shape)', (
      tester,
    ) async {
      final c = FlowYamlCodeController();
      addTearDown(c.dispose);
      c.fullText = '''
inputs:
  - name: pdf
    type: bytes
''';
      late TextSpan span;
      late ThemeData theme;
      await tester.pumpWidget(
        MaterialApp(
          home: Builder(
            builder: (context) {
              theme = Theme.of(context);
              span = c.buildTextSpan(context: context, withComposing: false);
              return const SizedBox();
            },
          ),
        ),
      );
      // Let CodeController's 500ms analyzer debounce fire so
      // the test teardown isn't blocked by a pending timer.
      await tester.pump(const Duration(seconds: 1));

      final tokens = _flattenLeaves(span);
      final bytesLeaves = tokens.where((t) => t.text == 'bytes').toList();
      expect(bytesLeaves, isNotEmpty);
      final expected = wireColor('bytes', theme);
      // Every `bytes` leaf in this snippet is the type value of
      // the `type: bytes` line.
      for (final leaf in bytesLeaves) {
        expect(leaf.style?.color, expected);
      }
    });
  });
}

class _Leaf {
  final String text;
  final TextStyle? style;
  const _Leaf(this.text, this.style);
}

List<_Leaf> _flattenLeaves(InlineSpan span) {
  final out = <_Leaf>[];
  void visit(InlineSpan s, TextStyle? inherited) {
    if (s is! TextSpan) return;
    final merged = inherited == null
        ? s.style
        : (s.style == null ? inherited : inherited.merge(s.style));
    final t = s.text;
    if (t != null && t.isNotEmpty) out.add(_Leaf(t, merged));
    final children = s.children;
    if (children != null) {
      for (final c in children) visit(c, merged);
    }
  }

  visit(span, null);
  return out;
}