package configkit_test

import (
	"reflect"
	"testing"

	configkit "gitea.maximumdirect.net/eric/ConfigKit"
)

func TestPublicHistoricalPathsEnumerateContextualShapes(t *testing.T) {
	loaded, err := configkit.Load[map[string]any](configkit.Bytes("main", []byte(
		"retired: {child: 1}\nshape: {'0': base}\n'a/b~': {'': 2}\n",
	)), configkit.Options[map[string]any]{Overrides: []configkit.Override{
		{Path: configkit.Keys("retired"), Value: nil, Flag: "--retired"},
		{Path: configkit.Keys("shape"), Value: []any{"replacement"}, Flag: "--shape"},
	}})
	if err != nil {
		t.Fatalf("Load: %v", err)
	}

	metadata := loaded.Metadata()
	paths := metadata.HistoricalPaths()
	got := make([]string, len(paths))
	for index, path := range paths {
		got[index] = path.String()
		if len(metadata.History(path)) == 0 {
			t.Errorf("enumerated path %s has no history", path)
		}
	}
	want := []string{"", "/a~1b~0", "/a~1b~0/", "/retired", "/retired/child", "/shape", "/shape/0"}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("historical paths = %v, want sorted unique pointers %v", got, want)
	}
	if _, ok := metadata.Lookup(paths[4]); ok {
		t.Fatal("removed descendant remains effective")
	}
	if _, ok := metadata.Lookup(paths[6]); !ok {
		t.Fatal("enumerated numeric path did not follow the effective sequence shape")
	}
	if len(metadata.History(paths[6])) == 0 {
		t.Fatal("enumerated numeric path lost history")
	}
	if _, ok := metadata.Lookup(configkit.Keys("shape", "0")); ok {
		t.Fatal("mapping-key path resolved against the effective sequence")
	}
	if len((configkit.Metadata{}).HistoricalPaths()) != 0 {
		t.Fatal("zero metadata contains historical paths")
	}

	paths[1] = configkit.Keys("mutated")
	if again := metadata.HistoricalPaths(); !reflect.DeepEqual(pathStrings(again), want) {
		t.Fatalf("returned path slice mutated retained metadata: %v", pathStrings(again))
	}
}

func pathStrings(paths []configkit.Path) []string {
	result := make([]string, len(paths))
	for index, path := range paths {
		result[index] = path.String()
	}
	return result
}