package configkit_test

import (
	"testing"
	"testing/fstest"

	configkit "go.maximumdirect.net/configkit"
)

func TestOverlayExplanationUsesQueryScopedOrigin(t *testing.T) {
	t.Parallel()
	filesystem := configkit.NewFilesystem("origin", fstest.MapFS{
		"main.yml":         {Data: []byte("a: base\ngroup: {x: X, y: Y}\n")},
		"overlays/dev.yml": {Data: []byte("a: overlay\ngroup: {x: O}\n")},
	})
	result, err := configkit.Load[map[string]any](filesystem.File("main.yml"), configkit.Options[map[string]any]{Overlay: "dev"})
	if err != nil {
		t.Fatal(err)
	}
	for _, test := range []struct {
		path         configkit.Path
		line, column int
	}{
		{configkit.Keys(), 1, 1},
		{configkit.Keys("group"), 2, 8},
		{configkit.Keys("group", "x"), 2, 12},
	} {
		explanation, found := result.Explain(test.path)
		if !found || len(explanation.History) == 0 {
			t.Fatalf("missing explanation for %s", test.path)
		}
		origin := explanation.History[len(explanation.History)-1].Origin
		if origin.Layer != configkit.LayerOverlay || len(origin.Locations) != 1 {
			t.Fatalf("overlay origin for %s = %#v", test.path, origin)
		}
		location := origin.Locations[0]
		if location.SourceID != "source-2" || location.Line != test.line || location.Column != test.column {
			t.Fatalf("overlay location for %s = %#v; want line %d column %d", test.path, location, test.line, test.column)
		}
	}
}