package backup

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

// R-1181 + D25 for app folders — the data-loss hunt's C3 case (felhom.eu audits/dataloss-hunt-2026-10-20/
// C3-D2-missing-leg/), asserting: a MISSING declared folder keeps its second-drive copy and is listed as kept; an
// EMPTIED folder is not mirrored over its full copy (the production `rsync -a --delete` mirror is used when present).
func TestR1181_MissingAndEmptiedAppFoldersKeepTheirCopies(t *testing.T) {
	m, src, target, prov := newTier2V2(t, "app")
	if _, err := exec.LookPath("rsync"); err == nil {
		m.tier2Mirror = rsyncMirror
	}
	prov.has["app"] = true
	prov.binds["app"] = []ClassifiedBind{mHDD("appdata/app/photos"), mHDD("appdata/app/docs")}
	mustWrite(t, filepath.Join(src, "appdata", "app", "photos", "family.jpg"), "PHOTO")
	mustWrite(t, filepath.Join(src, "appdata", "app", "docs", "contract.pdf"), "PDF")
	if err := m.RunTier2("app"); err != nil {
		t.Fatal(err)
	}
	destBase := filepath.Join(target, "backups", "secondary", "app")
	photo := filepath.Join(destBase, "hdd", "appdata", "app", "photos", "family.jpg")
	doc := filepath.Join(destBase, "hdd", "appdata", "app", "docs", "contract.pdf")
	if !exists(photo) || !exists(doc) {
		t.Fatal("precondition: run 1 did not copy both folders")
	}
	if err := os.RemoveAll(filepath.Join(src, "appdata", "app", "photos")); err != nil {
		t.Fatal(err)
	}
	if err := os.Remove(filepath.Join(src, "appdata", "app", "docs", "contract.pdf")); err != nil {
		t.Fatal(err)
	}
	if err := m.RunTier2("app"); err != nil {
		t.Fatal(err)
	}
	if !exists(photo) {
		t.Fatal("the MISSING folder's second-drive copy was deleted (R-1181)")
	}
	if !exists(doc) {
		t.Fatal("the EMPTIED folder was mirrored over its full copy (R-1181)")
	}
	kept := m.KeptCopies()
	if len(kept) != 1 || kept[0].Kind != "app" || kept[0].Reason != "folder_missing" {
		t.Fatalf("kept copies = %+v, want the photos folder", kept)
	}
	if cd := m.settings.GetCrossDriveConfig("app"); cd == nil || cd.LastWarning == "" {
		t.Fatalf("the run did not warn: %+v", cd)
	}
	// The folder comes back: mirrored again, the record goes.
	mustWrite(t, filepath.Join(src, "appdata", "app", "photos", "family.jpg"), "PHOTO")
	if err := m.RunTier2("app"); err != nil {
		t.Fatal(err)
	}
	if len(m.KeptCopies()) != 0 {
		t.Fatalf("the record outlived the folder's return: %+v", m.KeptCopies())
	}
}