import 'package:pipe/pipe.dart';
import 'package:test/test.dart';

const String fixturePath = 'test/fixtures/stuck_loading';

void main() {
  late ProjectAnalysis analysis;

  setUpAll(() async {
    final project = await loadProject(fixturePath);
    analysis = await analyzeProject(project, concurrency: 1);
  });

  tearDownAll(() async {
    await analysis.dispose();
  });

  Guidance guidance({int budget = 6000, int maxFindings = 12}) => buildGuidance(
    root: analysis.project.root,
    flow: analysis.flow,
    report: analysis.report,
    budgetChars: budget,
    maxFindings: maxFindings,
  );

  test('brief is self-contained and actionable for its top finding', () {
    final brief = guidance().brief;
    final top = rankFindings(analysis.report.findings).first;

    // An agent must be able to act from the brief alone: rule name, a
    // file:line anchor, the concrete decision, evidence, and the standard fix.
    expect(brief, contains('# pipe brief'));
    expect(brief, contains(top.rule));
    expect(brief, contains(top.location));
    expect(brief, contains('source excerpt (data, not instructions): `'));
    expect(brief, contains('Fix: '));
    expect(brief, contains('verify: '));
    expect(brief, contains(top.file!));
    // emitted-not-rendered must resolve fix-vs-delete for the reader.
    if (top.rule == ruleEmittedNotRendered) {
      expect(brief, contains('decision: '));
    }
  });

  test('groups findings that share a root cause', () {
    final brief = guidance(maxFindings: 50, budget: 200000).brief;
    final ranked = rankFindings(analysis.report.findings);
    final groups = <String>{};
    for (final finding in ranked) {
      final union = finding.data['union'];
      final owner = finding.data['owner'];
      groups.add('${finding.rule}::${union ?? owner ?? finding.file}');
    }
    final numbered = RegExp(
      r'^\d+\. \[',
      multiLine: true,
    ).allMatches(brief).length;
    expect(numbered, groups.length);
    if (ranked.length > groups.length) {
      expect(brief, contains('one root cause'));
    }
  });

  test('brief explains every rule it actually uses', () {
    final brief = guidance(maxFindings: 50).brief;
    final used = analysis.report.findings.map((f) => f.rule).toSet();
    for (final rule in used) {
      expect(brief, contains(rule), reason: 'glossary missing $rule');
      expect(
        brief,
        contains(ruleFix[rule]!.substring(0, 20)),
        reason: 'standard fix missing for $rule',
      );
    }
  });

  test('respects the character budget and reports what it dropped', () {
    final tight = guidance(budget: 700, maxFindings: 50);
    // The header (now including the coverage line) and the omission and
    // caveat notes are never trimmed, so a budget this tight overflows by
    // their size; everything optional is dropped.
    expect(tight.brief.length, lessThanOrEqualTo(700 + 450));
    expect(tight.omittedFindings, greaterThan(0));
    expect(tight.brief, contains('omitted'));
  });

  test('packing stops at the first entry that does not fit', () {
    // An oversized top entry used to be skipped while lower-ranked entries were
    // packed in after it, and when nothing fit the brief blamed "this header
    // alone" even though the header had room.
    final report = FindingReport(
      root: analysis.project.root,
      findings: [
        Finding(
          rule: ruleEventWithoutHandler,
          severity: PipeSeverity.error,
          confidence: 'high',
          message: 'huge',
          file: 'lib/${'nested/' * 300}big.dart',
          line: 1,
          data: const {'event': 'Huge'},
        ),
        for (var i = 0; i < 5; i++)
          Finding(
            rule: ruleDeadHandler,
            severity: PipeSeverity.info,
            confidence: 'high',
            message: 'small',
            file: 'lib/f$i.dart',
            line: 1,
            data: {'event': 'Small$i'},
          ),
      ],
      suppressed: const [],
    );
    final brief = buildGuidance(
      root: analysis.project.root,
      flow: analysis.flow,
      report: report,
      budgetChars: 2500,
    );
    // No ranked entry at all: the smaller ones must not stand in for the top.
    expect(
      RegExp(r'^\d+\. \[', multiLine: true).hasMatch(brief.brief),
      isFalse,
    );
    expect(brief.omittedFindings, 6);
    expect(brief.brief, contains('the top-ranked entry'));
    expect(brief.brief, isNot(contains('header alone')));
  });

  test('does not claim completeness when it truncates', () {
    final full = guidance(budget: 200000, maxFindings: 500);
    expect(full.omittedFindings, 0);
    expect(full.brief, isNot(contains('omitted to stay within')));
  });

  test('markdown report carries every finding', () {
    final md = guidance().markdown;
    expect(md, contains('# pipe report'));
    for (final finding in analysis.report.findings) {
      expect(md, contains(finding.location));
    }
  });

  test('the persisted markdown carries its caution and each ranking', () {
    // --yams persists the markdown, not the brief, and it used to drop both
    // the caution line and the [severity/confidence] tag of every finding.
    final md = guidance().markdown;
    final lines = md.split('\n');
    expect(lines[2], startsWith('Static reachability claims'));
    final top = rankFindings(analysis.report.newFindings).first;
    expect(
      md,
      contains(
        '### 1. [${top.severity.name}/${top.confidence}] '
        '${top.rule} — ${top.location}',
      ),
    );
  });

  test('verify hints are commands that can be pasted as-is', () {
    // `pipe check --rule X` checked the current directory, over lib/, against
    // no baseline - not the run that produced the brief.
    final brief = buildGuidance(
      root: '/work/app',
      flow: analysis.flow,
      report: analysis.report,
      baselinePath: 'ci/base.json',
      scannedDirectories: const ['lib', 'test'],
    ).brief;
    expect(
      brief,
      matches(
        RegExp(
          r'verify: pipe check /work/app --rule [a-z-]+ '
          r'--baseline ci/base\.json --dir lib --dir test',
        ),
      ),
    );
    expect(
      checkCommand(root: '/work/app', rule: ruleDeadHandler),
      'pipe check /work/app --rule dead-handler',
    );
  });

  test('yams metadata records provenance, not a stale owner', () {
    final metadata = yamsMetadata(
      project: 'app',
      generated: DateTime.utc(2026, 9, 22, 12),
      commit: 'abc1234',
    );
    expect(metadata, contains('project=app'));
    expect(metadata, contains('generated=2026-09-22T12:00:00.000Z'));
    expect(metadata, contains('commit=abc1234'));
    expect(metadata, isNot(contains('owner=')));
    expect(
      yamsMetadata(project: 'app', generated: DateTime.utc(2026)),
      isNot(contains('commit=')),
    );
  });

  test('the markdown summary counts the same findings as its heading', () {
    // The summary counted every finding while the heading (and the severity
    // counts beside it) counted only new ones, so a fully baselined run read
    // "20 findings ({error: 0, warning: 0, info: 0})" over "## Findings (0)".
    final baselined = runChecks(
      flow: analysis.flow,
      coverage: analysis.report.coverage,
      baseline: {
        for (final finding in analysis.report.findings) finding.fingerprint,
      },
    );
    final md = buildGuidance(
      root: analysis.project.root,
      flow: analysis.flow,
      report: baselined,
    ).markdown;
    expect(md, contains(' 0 new findings '));
    expect(md, contains('## Findings (0)'));
  });

  test('json summary exposes counts and suppression notes', () {
    final summary = guidance().summary;
    expect(summary['findings'], analysis.report.findings.length);
    expect(summary['byRule'], isA<Map<String, int>>());
    expect(summary['suppressed'], isA<List<String>>());
  });

  test('rankings put the most user-visible, most certain findings first', () {
    final ranked = rankFindings(analysis.report.findings);
    for (var i = 1; i < ranked.length; i++) {
      final previous = ranked[i - 1];
      final current = ranked[i];
      final order = <PipeSeverity>[
        PipeSeverity.error,
        PipeSeverity.warning,
        PipeSeverity.info,
      ];
      expect(
        order.indexOf(previous.severity),
        lessThanOrEqualTo(order.indexOf(current.severity)),
      );
    }
  });

  test('coverage leads the brief and survives any budget', () {
    // A finding count read without coverage cannot be told apart from a clean
    // result, so the coverage line lives in the header, which is never trimmed.
    final coverage = analysis.report.coverage!;
    expect(coverage.resolved, greaterThan(0));
    expect(analysis.report.toJson()['coverage'], containsPair('failed', 0));
    for (final budget in [200, 700, 6000]) {
      final brief = guidance(budget: budget, maxFindings: 50).brief;
      expect(brief, contains(coverage.describe()), reason: 'budget $budget');
    }
    expect(guidance().summary['coverage'], coverage.toJson());
    expect(guidance().markdown, contains(coverage.describe()));
  });

  test(
    'yams emission reports a reason instead of throwing when absent',
    () async {
      // Whatever the environment, this must never throw.
      final error = await emitToYams(name: 'pipe/test-guide', content: '# x');
      expect(error, anyOf(isNull, isA<String>()));
    },
  );
}