package stacks

import (
	"sort"
	"strings"
	"sync"
	"testing"
)

// R-1117: a template that drops a volume leaves the old one on an installed box, still carrying the app's compose project
// label (and a restore re-creates it with that label). `compose down --volumes` removes only the volumes the CURRENT
// definition declares, so before this fix the removal listed it and kept it — measured on scratch 9202, 2026-10-18:
// Nextcloud removed „with data", `nextcloud_nextcloud_redis_data` still there. The consequence pinned: after the
// removal no volume with the app's project label is left, and a volume of another project is never touched.
// RED-PROOF: delete the leftover loop in RemoveStack → "left behind: [app_app_redis_data]".
func TestR1117_RemoveDeletesALabelledVolumeTheDefinitionNoLongerDeclares(t *testing.T) {
	drive := t.TempDir()
	m, _, _ := newR442Manager(t, "app", ssdCompose, driveAppYAML(drive), drive)
	var mu sync.Mutex
	// project label per volume: the app's own (declared or not), and another app's.
	vols := map[string]string{"app_app_redis_data": "app", "other_app_data": "other"}
	var removedByRm []string
	m.execFn = func(name string, args ...string) (string, error) {
		mu.Lock()
		defer mu.Unlock()
		a := strings.Join(args, " ")
		switch {
		case strings.HasPrefix(a, "volume ls --filter label=com.docker.compose.project="):
			p := strings.TrimPrefix(strings.Fields(a)[3], "label=com.docker.compose.project=")
			var out []string
			for v, proj := range vols {
				if proj == p {
					out = append(out, v)
				}
			}
			sort.Strings(out)
			return strings.Join(out, "\n"), nil
		case a == "volume ls -q":
			var out []string
			for v := range vols {
				out = append(out, v)
			}
			sort.Strings(out)
			return strings.Join(out, "\n"), nil
		case strings.HasPrefix(a, "volume rm "):
			v := strings.Fields(a)[len(strings.Fields(a))-1]
			delete(vols, v)
			removedByRm = append(removedByRm, v)
			return v, nil
		}
		return "", nil
	}
	resp, err := m.RemoveStack("app", false, nil)
	if err != nil {
		t.Fatalf("RemoveStack: %v", err)
	}
	mu.Lock()
	defer mu.Unlock()
	var left []string
	for v, proj := range vols {
		if proj == "app" {
			left = append(left, v)
		}
	}
	if len(left) > 0 {
		t.Fatalf("left behind: %v — a volume with the app's project label outlived its removal", left)
	}
	if _, ok := vols["other_app_data"]; !ok {
		t.Fatalf("another app's volume was removed (rm calls: %v)", removedByRm)
	}
	found := false
	for _, v := range resp.VolumesRemoved {
		found = found || v == "app_app_redis_data"
	}
	if !found {
		t.Errorf("volumes_removed = %v, want it to name app_app_redis_data", resp.VolumesRemoved)
	}
}