// Behavioural tests for FlowAnalyzer — the YAML-aware
// AbstractAnalyzer that feeds the flow editor's gutter + the
// custom CodeController's wavy-underline overrides.

import 'package:fai_studio_flow_editor/src/flow_analyzer.dart';
import 'package:fai_studio_flow_editor/src/quick_fix.dart';
import 'package:flutter_code_editor/flutter_code_editor.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:highlight/languages/yaml.dart';

Code _wrap(String text) => Code(text: text, language: yaml);

void main() {
  group('FlowAnalyzer', () {
    test('empty buffer reports no issues', () async {
      final a = FlowAnalyzer(availableCapabilities: () => const []);
      final r = await a.analyze(_wrap(''));
      expect(r.issues, isEmpty);
    });

    test('valid hello flow reports no issues', () async {
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['debug.echo'],
      );
      final r = await a.analyze(_wrap('''
name: hello
inputs:
  name: text
steps:
  - id: greet
    use: debug.echo@^0
    with:
      message: \$inputs.name
outputs:
  greeting: \$greet.echoed
'''));
      expect(r.issues, isEmpty);
    });

    test('flags unknown capability on the use line', () async {
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['debug.echo'],
      );
      final r = await a.analyze(_wrap('''
name: hello
inputs:
  msg: text
steps:
  - id: t
    use: text.translate@^1
outputs: {}
'''));
      expect(r.issues, hasLength(1));
      expect(r.issues.first.message, contains('text.translate'));
      expect(r.issues.first.type, IssueType.error);
    });

    test('flags unknown input type', () async {
      final a = FlowAnalyzer(availableCapabilities: () => const []);
      final r = await a.analyze(_wrap('''
name: hello
inputs:
  pdf: byes
steps: []
outputs: {}
'''));
      expect(r.issues, hasLength(1));
      expect(r.issues.first.message, contains('byes'));
      expect(r.issues.first.type, IssueType.warning);
    });

    test('YAML parse error pins to the offending line', () async {
      final a = FlowAnalyzer(availableCapabilities: () => const []);
      // Unterminated quoted string — a real parse error rather
      // than a structural oddity YAML happens to tolerate.
      final r = await a.analyze(_wrap('name: "unterminated\n'));
      expect(r.issues, hasLength(1));
      expect(r.issues.first.type, IssueType.error);
      expect(r.issues.first.message, startsWith('YAML:'));
    });

    test('matches the bare capability id ignoring @version', () async {
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['text.echo'],
      );
      final r = await a.analyze(_wrap('''
name: x
steps:
  - id: e
    use: text.echo@^2
'''));
      expect(r.issues, isEmpty);
    });

    test('empty installed list silences capability checks', () async {
      // When the host hasn't supplied a list (Studio still
      // booting, or running in CLI-only mode), we deliberately
      // don't false-positive every `use:` row.
      final a = FlowAnalyzer(availableCapabilities: () => const []);
      final r = await a.analyze(_wrap('''
steps:
  - id: e
    use: text.echo@^2
'''));
      expect(r.issues, isEmpty);
    });

    test('attaches InstallCapabilityFix when the capability is in the store',
        () async {
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['debug.echo'],
        storeCapabilities: () => const ['text.classify'],
      );
      final r = await a.analyze(_wrap('''
name: x
steps:
  - id: c
    use: text.classify@^1
'''));
      expect(r.issues, hasLength(1));
      final fixes = a.fixesFor(r.issues.first);
      expect(fixes, hasLength(1));
      final fix = fixes.first;
      expect(fix, isA<InstallCapabilityFix>());
      expect((fix as InstallCapabilityFix).capability, 'text.classify@^1');
    });

    test('falls back to AddModuleSourceFix when unknown and not in store',
        () async {
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['debug.echo'],
        storeCapabilities: () => const ['text.classify'],
      );
      final r = await a.analyze(_wrap('''
name: x
steps:
  - id: c
    use: htw.private/secret@^0.1
'''));
      expect(r.issues, hasLength(1));
      final fixes = a.fixesFor(r.issues.first);
      expect(fixes, hasLength(1));
      expect(fixes.first, isA<AddModuleSourceFix>());
      expect(r.issues.first.message, contains('Not in the store'));
    });

    test('did-you-mean wins over install/add-source when a near miss exists',
        () async {
      // Installed bare `text.echo`; user typed `text.echi` (edit-distance 1).
      // The fix list should carry the Replace-as-primary; no install or
      // add-source needed because the analyzer already found the answer.
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['text.echo@^0.1'],
        storeCapabilities: () => const [],
      );
      final r = await a.analyze(_wrap('''
name: x
steps:
  - id: t
    use: text.echi@^0.1
'''));
      expect(r.issues, hasLength(1));
      final fixes = a.fixesFor(r.issues.first);
      expect(fixes.first, isA<ReplaceLineValueFix>());
      // Replacement preserves the version constraint by reusing the
      // installed entry's `@^0.1`.
      expect(
        (fixes.first as ReplaceLineValueFix).replacement,
        'text.echo@^0.1',
      );
    });

    test('records worst severity per step for canvas highlighting',
        () async {
      final a = FlowAnalyzer(
        availableCapabilities: () => const ['debug.echo'],
        storeCapabilities: () => const [],
      );
      await a.analyze(_wrap('''
name: x
inputs:
  pdf: byes
steps:
  - id: bad
    use: nope@^1
'''));
      expect(a.stepSeverity['bad'], IssueType.error);
      expect(a.stepSeverity[kInputsNodeId], IssueType.warning);
    });

    test('suggests closest valid type for a misspelled value', () async {
      final a = FlowAnalyzer(availableCapabilities: () => const []);
      final r = await a.analyze(_wrap('''
name: x
inputs:
  pdf: byes
steps: []
'''));
      expect(r.issues, hasLength(1));
      final fixes = a.fixesFor(r.issues.first);
      expect(fixes, hasLength(1));
      final fix = fixes.first;
      expect(fix, isA<ReplaceLineValueFix>());
      expect((fix as ReplaceLineValueFix).replacement, 'bytes');
      expect(fix.line, r.issues.first.line);
    });

    test('emits no fix when the typo is far from every known type',
        () async {
      final a = FlowAnalyzer(availableCapabilities: () => const []);
      final r = await a.analyze(_wrap('''
name: x
inputs:
  pdf: zonglefax
steps: []
'''));
      expect(r.issues, hasLength(1));
      final fixes = a.fixesFor(r.issues.first);
      expect(fixes, isEmpty);
    });
  });
}