package stacks

import "testing"

// R-591: deepCopyStack is "a snapshot the caller may mutate". Before the fix the Meta.I18n map
// (and every pointer inside each overlay) was shared, so writing through the copy changed the
// original. The test asserts the CONSEQUENCE: after mutating the copy at every depth, the
// original still reads its own values.
func TestDeepCopyStackI18nIsNotShared(t *testing.T) {
	s := func(v string) *string { return &v }
	orig := &Stack{Name: "demo"}
	orig.Meta.I18n = map[string]MetadataOverlay{
		"en": {
			Description: s("orig desc"),
			AppInfo:     &AppInfoOverlay{Tagline: s("orig tag"), UseCases: []string{"orig use"}},
			DeployFields: []DeployFieldOverlay{{EnvVar: "A", Label: s("orig label"),
				Options: []SelectOptionOverlay{{Value: "x", Label: s("orig opt")}}}},
			OptionalConfig: []OptionalConfigGroupOverlay{{MatchGroup: "g", Group: s("orig group"),
				Fields: []OptionalConfigFieldOverlay{{EnvVar: "B", HelpText: s("orig help")}}}},
			Integrations: []IntegrationOverlay{{Target: "t", Label: s("orig int")}},
			DataPaths:    []DataPathOverlay{{Path: "/p", Label: s("orig path")}},
			InitialCreds: &InitialCredentialsOverlay{Note: s("orig note")},
		},
	}

	cp := deepCopyStack(orig)
	en := cp.Meta.I18n["en"]
	*en.Description = "MUT"
	*en.AppInfo.Tagline = "MUT"
	en.AppInfo.UseCases[0] = "MUT"
	*en.DeployFields[0].Label = "MUT"
	*en.DeployFields[0].Options[0].Label = "MUT"
	*en.OptionalConfig[0].Group = "MUT"
	*en.OptionalConfig[0].Fields[0].HelpText = "MUT"
	*en.Integrations[0].Label = "MUT"
	*en.DataPaths[0].Label = "MUT"
	*en.InitialCreds.Note = "MUT"
	cp.Meta.I18n["de"] = MetadataOverlay{Description: s("MUT")}

	o := orig.Meta.I18n["en"]
	checks := map[string]string{
		"description":    *o.Description,
		"tagline":        *o.AppInfo.Tagline,
		"use case":       o.AppInfo.UseCases[0],
		"deploy label":   *o.DeployFields[0].Label,
		"option label":   *o.DeployFields[0].Options[0].Label,
		"optional group": *o.OptionalConfig[0].Group,
		"optional help":  *o.OptionalConfig[0].Fields[0].HelpText,
		"integration":    *o.Integrations[0].Label,
		"data path":      *o.DataPaths[0].Label,
		"initial creds":  *o.InitialCreds.Note,
	}
	for what, got := range checks {
		if got == "MUT" {
			t.Errorf("R-591: mutating the copy's %s overlay changed the ORIGINAL — the overlay is shared, not copied", what)
		}
	}
	if _, ok := orig.Meta.I18n["de"]; ok {
		t.Errorf("R-591: adding a language to the copy's I18n map added it to the ORIGINAL — the map is shared")
	}
}