package configkit

import (
	"os"
	"path/filepath"
	"testing"

	"gitea.maximumdirect.net/eric/ConfigKit/internal/engine"
)

func TestOverlayPublicValues(t *testing.T) {
	if LayerOverlay != "overlay" {
		t.Fatalf("LayerOverlay = %q", LayerOverlay)
	}
	for code, value := range map[Code]string{
		CodeOverlayInvalid:       "overlay.invalid",
		CodeOverlayMissing:       "overlay.missing",
		CodeOverlayOutsideRoot:   "overlay.outside_root",
		CodeOverlayRepeated:      "overlay.repeated",
		CodeOverlayDirective:     "overlay.directive",
		CodeOverlayVersion:       "overlay.version",
		CodeOverlayLimitExceeded: "overlay.limit_exceeded",
	} {
		if string(code) != value {
			t.Errorf("code = %q, want %q", code, value)
		}
	}
}

func TestSourceInfoDestinationConversionsAndCopies(t *testing.T) {
	destination := Keys("collections", "a/b", "0")
	path := writeRecordConfig(t, "value: main\n")
	options := engine.OptionsWithPlacement(engine.Options[map[string]any]{}, engine.Keys("collections", "a/b", "0"), uint8(PlacementModeSequenceItem))
	internal := engineSourceInfoFromLoad(t, path, "source-1", options)
	converted := fromEngineSourceInfo(internal)
	if converted.Destination.String() != destination.String() || converted.PlacementMode != PlacementModeSequenceItem || converted.DestinationUnresolved {
		t.Fatalf("public source evidence = %#v", converted)
	}
	copy := cloneSourceInfo(converted)
	copy.Destination = Path{}
	if converted.Destination.String() != destination.String() {
		t.Fatalf("source record destination changed through clone: %q", converted.Destination.String())
	}
}

func TestSourceVersionCheckConversionsAndCopies(t *testing.T) {
	path := Keys("version")
	file := writeRecordConfig(t, "version: '123'\nvalue: main\n")
	options := engine.Options[recordConfig]{
		Definition: engine.Definition[recordConfig]{
			Version: &engine.VersionRule{
				Path: engine.Keys("version"),
				Check: func(version engine.Version, _ *engine.Validation) error {
					if !version.Present || version.Text != "123" {
						t.Fatalf("version callback input = %#v", version)
					}
					return nil
				},
			},
		},
		SourceVersionMode: engine.SourceVersionModeFromFacade(uint8(SourceVersionModeIfPresent)),
	}
	internal := engineSourceInfoFromLoad(t, file, "source-1", options)
	converted := fromEngineSourceInfo(internal)
	if converted.VersionCheck == nil || converted.VersionCheck.Path.String() != path.String() ||
		!converted.VersionCheck.Version.Present || converted.VersionCheck.Version.Text != "123" ||
		converted.VersionCheck.Location == nil || converted.VersionCheck.Location.SourceID != internal.ID || converted.VersionCheck.Location.Line != 1 {
		t.Fatalf("public source version check = %#v", converted.VersionCheck)
	}
	copy := cloneSourceInfo(converted)
	copy.VersionCheck.Path = Keys("changed")
	copy.VersionCheck.Version.Text = "changed"
	copy.VersionCheck.Location.Line = 99
	copy.VersionCheck.Redacted = true
	if converted.VersionCheck.Path.String() != path.String() || converted.VersionCheck.Version.Text != "123" ||
		converted.VersionCheck.Location.Line != 1 || converted.VersionCheck.Redacted {
		t.Fatalf("source version check changed through a detached copy: %#v", converted.VersionCheck)
	}
}

func TestImportSelectionConversionsAndCopies(t *testing.T) {
	file := writeRecordConfig(t, "configkit:\n  imports:\n    - glob: absent/*.yml\nvalue: main\n")
	internal := engineSourceInfoFromLoad(t, file, "source-1", engine.Options[recordConfig]{Imports: true})
	converted := fromEngineSourceInfo(internal)
	if len(converted.ImportSelections) != 1 || converted.ImportSelections[0].Path.String() != "/configkit/imports/0" ||
		converted.ImportSelections[0].Location.SourceID != internal.ID || converted.ImportSelections[0].Location.Line != 3 ||
		converted.ImportSelections[0].Selector != ImportSelectorGlob || converted.ImportSelections[0].Outcome != ImportSelectionNone {
		t.Fatalf("converted selection evidence = %#v", converted.ImportSelections)
	}
	copy := cloneSourceInfo(converted)
	copy.ImportSelections[0].Path = Keys("copy")
	copy.ImportSelections[0].Selector = ImportSelectorPath
	if converted.ImportSelections[0].Path.String() != "/configkit/imports/0" || converted.ImportSelections[0].Selector != ImportSelectorGlob {
		t.Fatalf("source selection evidence changed through copy: %#v", converted.ImportSelections)
	}
	if converted.ImportSelections[0].Outcome != ImportSelectionNone {
		t.Fatalf("source selection outcome = %q", converted.ImportSelections[0].Outcome)
	}
	if fromEngineImportSelections(nil) != nil {
		t.Fatal("converting nil engine selections returned a non-nil slice")
	}
	if fromEngineImportSelections([]engine.ImportSelectionForFacade{}) == nil {
		t.Fatal("converting an empty engine selection slice returned nil")
	}
	empty := cloneSourceInfo(SourceInfo{ImportSelections: make([]ImportSelection, 0)})
	if empty.ImportSelections == nil {
		t.Fatal("cloning collapsed a non-nil empty selection slice")
	}
}

func TestOverrideConversionsPreserveSliceShapeAndCopyRecords(t *testing.T) {
	if toEngineOverrides(nil) != nil {
		t.Fatal("nil overrides converted to a non-nil slice")
	}
	empty := make([]Override, 0)
	if toEngineOverrides(empty) == nil || toEngineOptions(Options[recordConfig]{Overrides: empty}).Overrides == nil ||
		toEngineLayeredOptions(LayeredOptions[recordConfig]{Overrides: empty}).Overrides == nil {
		t.Fatal("a non-nil empty override slice was collapsed")
	}

	overrides := []Override{{Path: Keys("feature", "enabled"), Value: "yes", Flag: "--feature-enabled"}}
	ordinary := toEngineOptions(Options[recordConfig]{Overrides: overrides})
	layered := toEngineLayeredOptions(LayeredOptions[recordConfig]{Overrides: overrides})
	overrides[0] = Override{Path: Keys("changed"), Value: "no", Flag: "--changed"}
	for label, converted := range map[string][]engine.Override{"ordinary": ordinary.Overrides, "layered": layered.Overrides} {
		if len(converted) != 1 || converted[0].Path.String() != "/feature/enabled" || converted[0].Value != "yes" || converted[0].Flag != "--feature-enabled" {
			t.Errorf("%s overrides = %#v", label, converted)
		}
	}
}

type recordConfig struct {
	Value   string `yaml:"value"`
	Version string `yaml:"version"`
}

func writeRecordConfig(t *testing.T, content string) string {
	t.Helper()
	path := filepath.Join(t.TempDir(), "config.yml")
	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
		t.Fatal(err)
	}
	return path
}

func engineSourceInfoFromLoad[T any](t *testing.T, path, sourceID string, options engine.Options[T]) engine.SourceInfo {
	t.Helper()
	loaded, err := engine.Load(engine.File(path), engine.SecretBinding{}, options)
	if err != nil {
		t.Fatalf("engine load: %v", err)
	}
	for _, source := range loaded.Inspection.Sources() {
		if source.ID == sourceID {
			return source
		}
	}
	t.Fatalf("engine inspection contains no source %q", sourceID)
	return engine.SourceInfo{}
}