import 'dart:convert';
import 'dart:io';

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

void main() {
  late String manifestPath;

  setUpAll(() {
    // Point the manifest at the fixture project so recall machinery is covered
    // in CI without depending on external repos.
    final fixture = Directory('test/fixtures/stuck_loading').absolute.path;
    final temp = Directory.systemTemp.createTempSync('pipe-recall');
    manifestPath = '${temp.path}/manifest.json';
    File(manifestPath).writeAsStringSync(
      const JsonEncoder.withIndent('  ').convert({
        'version': 1,
        'cases': [
          {
            'id': 'known-real-bug',
            'repo': fixture,
            'rule': 'emitted-not-rendered',
            'match': {'union': 'ItemState'},
          },
          {
            'id': 'bug-that-does-not-exist',
            'repo': fixture,
            'rule': 'emitted-not-rendered',
            'match': {'union': 'NoSuchState'},
            'note': 'expected on master; the fix lives on an unmerged branch',
          },
          {
            'id': 'repo-absent-on-this-machine',
            'repo': 'definitely-not-a-real-repo',
            'rule': 'emitted-not-rendered',
            'match': {'union': 'ItemState'},
          },
        ],
      }),
    );
  });

  test('reports found, missed and skipped separately', () async {
    final report = await runRecall(
      manifestPath: manifestPath,
      root: Directory.current.path,
      concurrency: 1,
    );

    expect(report.outcomes, hasLength(3));
    expect(report.evaluated, hasLength(2));
    expect(report.skippedCases, hasLength(1));

    final found = report.evaluated.where((o) => o.found).toList();
    expect(found, hasLength(1));
    expect(found.single.testCase.id, 'known-real-bug');
    expect(found.single.at, contains('item_bloc.dart'));
    expect(found.single.at, contains(':'), reason: 'should be file:line');

    expect(report.missed, hasLength(1));
    expect(report.missed.single.testCase.id, 'bug-that-does-not-exist');
    expect(report.allEvaluatedFound, isFalse);
  });

  test('per-rule recall is found/total over evaluated cases only', () async {
    final report = await runRecall(
      manifestPath: manifestPath,
      root: Directory.current.path,
      concurrency: 1,
    );
    // The skipped case must not dilute recall.
    expect(report.recallByRule, {'emitted-not-rendered': '1/2'});
    expect(report.toJson()['skipped'], 1);
    expect(report.toJson()['evaluated'], 2);
  });

  test('a missing manifest is an actionable error, not a crash', () {
    expect(
      () => loadRecallCases('/nope/does-not-exist.json'),
      throwsA(isA<PipeException>()),
    );
  });

  test('a malformed manifest is rejected', () {
    final temp = Directory.systemTemp.createTempSync('pipe-recall-bad');
    final bad = '${temp.path}/bad.json';
    File(bad).writeAsStringSync('{"cases": [{"id": "x"}]}');
    expect(() => loadRecallCases(bad), throwsA(isA<PipeException>()));
  });

  test(
    'a MISSED case prints its note, so an expected miss explains itself',
    () async {
      // Without this, the manifest note never reached the reader: a case that
      // misses because its fix is on an unmerged branch looked exactly like a
      // regression in pipe.
      final report = await runRecall(
        manifestPath: manifestPath,
        root: Directory.current.path,
        concurrency: 1,
      );

      final text = report.describe();
      expect(text, contains('MISSED'));
      expect(
        text,
        contains(
          'note: expected on master; the fix lives on an unmerged branch',
        ),
      );
    },
  );

  test('an unknown status is rejected instead of silently read as open', () {
    // 'fix' is the typo a reader is most likely to write. Defaulting it to
    // `open` reported a MISSED case and sent them hunting for a regression that
    // was really a manifest typo.
    final temp = Directory.systemTemp.createTempSync('pipe-recall-status');
    final bad = '${temp.path}/status.json';
    File(bad).writeAsStringSync(
      const JsonEncoder.withIndent('  ').convert({
        'version': 1,
        'cases': [
          {
            'id': 'typo-status',
            'repo': 'test/fixtures/stuck_loading',
            'rule': 'emitted-not-rendered',
            'match': {'union': 'ItemState'},
            'status': 'fix',
          },
        ],
      }),
    );

    expect(
      () => loadRecallCases(bad),
      throwsA(
        isA<PipeException>().having(
          (e) => e.toString(),
          'message',
          allOf(contains('status "fix"'), contains('open'), contains('fixed')),
        ),
      ),
    );
  });

  test('a vacuous recall run fails instead of reporting 0/0 as success', () async {
    // "0/0 known bugs accounted for" reads as a pass, so both ways of evaluating
    // nothing are now failures: an empty manifest, and a --root under which none
    // of the manifest's repos exist.
    final temp = Directory.systemTemp.createTempSync('pipe-recall-vacuous');
    final emptyManifest = '${temp.path}/empty.json';
    File(emptyManifest).writeAsStringSync('{"version": 1, "cases": []}');
    await expectLater(
      runRecall(
        manifestPath: emptyManifest,
        root: Directory.current.path,
        concurrency: 1,
      ),
      throwsA(isA<PipeException>()),
    );

    // A case whose repo is a RELATIVE name that does not resolve under --root is
    // skipped; when that is all of them, the run verified nothing.
    final absentManifest = '${temp.path}/absent.json';
    File(absentManifest).writeAsStringSync(
      const JsonEncoder.withIndent('  ').convert({
        'version': 1,
        'cases': [
          {
            'id': 'absent-repo',
            'repo': 'definitely-not-a-real-repo',
            'rule': 'dead-handler',
            'match': {'event': 'NeverDispatched'},
          },
        ],
      }),
    );
    await expectLater(
      runRecall(manifestPath: absentManifest, root: temp.path, concurrency: 1),
      throwsA(
        isA<PipeException>().having(
          (error) => error.toString(),
          'message',
          contains('evaluated none'),
        ),
      ),
    );
  });
}