package windsurf

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

func TestBinaryFilename(t *testing.T) {
	tests := []struct {
		name    string
		p       Platform
		want    string
		wantErr bool
	}{
		{"linux amd64", Platform{"linux", "amd64"}, "language_server_linux_x64", false},
		{"linux arm64", Platform{"linux", "arm64"}, "language_server_linux_arm", false},
		{"darwin arm64", Platform{"darwin", "arm64"}, "language_server_macos_arm", false},
		{"darwin amd64 (intel mac)", Platform{"darwin", "amd64"}, "language_server_macos_x64", false},
		{"windows amd64", Platform{"windows", "amd64"}, "language_server_windows_x64.exe", false},
		{"windows arm64", Platform{"windows", "arm64"}, "language_server_windows_arm.exe", false},
		{"freebsd", Platform{"freebsd", "amd64"}, "", true},
		{"linux 386", Platform{"linux", "386"}, "", true},
		{"empty", Platform{}, "", true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := BinaryFilename(tt.p)
			if tt.wantErr {
				if err == nil {
					t.Fatalf("expected error, got nil (value %q)", got)
				}
				if !errors.Is(err, ErrUnsupportedPlatform) {
					t.Fatalf("expected ErrUnsupportedPlatform in chain, got %v", err)
				}
				// Error message should point the user toward Docker.
				if !strings.Contains(err.Error(), "docker") {
					t.Errorf("unsupported-platform error should mention docker, got: %v", err)
				}
				return
			}
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			if got != tt.want {
				t.Errorf("BinaryFilename(%v) = %q, want %q", tt.p, got, tt.want)
			}
		})
	}
}

func TestDetectPlatformFor(t *testing.T) {
	tests := []struct {
		name     string
		goos     string
		goarch   string
		rosetta  bool
		wantOS   string
		wantArch string
	}{
		{"linux amd64 unchanged", "linux", "amd64", false, "linux", "amd64"},
		{"windows amd64 unchanged", "windows", "amd64", false, "windows", "amd64"},
		{"darwin arm64 unchanged", "darwin", "arm64", false, "darwin", "arm64"},
		{"darwin amd64 no rosetta stays amd64", "darwin", "amd64", false, "darwin", "amd64"},
		{"darwin amd64 under rosetta promotes to arm64", "darwin", "amd64", true, "darwin", "arm64"},
		{"linux amd64 rosetta flag ignored (not darwin)", "linux", "amd64", true, "linux", "amd64"},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := detectPlatformFor(tt.goos, tt.goarch, tt.rosetta)
			if got.OS != tt.wantOS || got.Arch != tt.wantArch {
				t.Errorf("detectPlatformFor(%q,%q,%v) = %v, want {OS:%q Arch:%q}",
					tt.goos, tt.goarch, tt.rosetta, got, tt.wantOS, tt.wantArch)
			}
		})
	}
}

func TestPlatformString(t *testing.T) {
	if got := (Platform{OS: "darwin", Arch: "arm64"}).String(); got != "darwin/arm64" {
		t.Errorf("Platform.String() = %q, want %q", got, "darwin/arm64")
	}
}

func TestProcTranslatedProbeNonDarwin(t *testing.T) {
	// The default probe must always return false on non-darwin platforms
	// without calling sysctl. We can only validate this runtime behavior on
	// the builder we're on — for non-darwin builders the probe should be
	// false even if sysctl were somehow present.
	//
	// For darwin builders, we accept either result; we only assert that the
	// probe does not panic and returns a bool.
	_ = defaultProcTranslatedProbe()
}