package validation

import (
	"context"
	"errors"
	"strings"
	"testing"
)

func TestRunPreservesCanceledGoSetup(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()

	err := Run(ctx, Request{RepositoryDir: t.TempDir()})
	var failure *Failure
	if !errors.As(err, &failure) {
		t.Fatalf("Run() error = %v, want a validation failure", err)
	}
	if failure.Check != GoTest {
		t.Fatalf("failure check = %q, want %q", failure.Check, GoTest)
	}
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("Run() error = %v, want context cancellation preserved", err)
	}
}

func TestFailureFormatsDiagnosticsAndUnwrapsCause(t *testing.T) {
	wantCause := errors.New("underlying check error")
	failure := &Failure{
		Check: GoTest,
		Findings: []Finding{{
			Path:    "README.md",
			Line:    4,
			Column:  2,
			Message: "broken destination",
		}},
		Measurement: &FileSizeMeasurement{Bytes: 12, LimitBytes: 10},
		Cause:       wantCause,
	}

	if !errors.Is(failure, wantCause) {
		t.Fatalf("Failure does not unwrap its cause")
	}
	for _, part := range []string{"go-test", "README.md:4:2", "broken destination", "12 bytes", "10 byte limit", wantCause.Error()} {
		if !strings.Contains(failure.Error(), part) {
			t.Errorf("Failure.Error() = %q; want it to include %q", failure.Error(), part)
		}
	}
}