package backup

import (
	"io"
	"log"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"gitea.dooplex.hu/admin/felhom-controller/internal/stacks"
)

// R-669 (v0.270.0): the recovery unit captures the PINNED version's .felhom.yml (the applied record),
// not the stack dir's — which the sync may already have replaced with a newer, even failing, step's file.
// MEASURED 2026-09-24 (A2): the unit held port 8999 (the failing step's probe), a restore wrote it back,
// and the next undo judged the correct version with it and held the app.
//
// COMPANION RED-PROOF (REPORT.md): capture the stack dir's .felhom.yml again → "the unit carries the
// failing step's probe".
func TestR669_UnitCapturesThePinnedVersionsMeta(t *testing.T) {
	tmp := t.TempDir()
	stackDir := filepath.Join(tmp, "stack")
	drive := filepath.Join(tmp, "drive")
	mustWrite(t, filepath.Join(stackDir, "docker-compose.yml"), "services:\n  app:\n    image: example/app:1.2.3\n")
	mustWrite(t, filepath.Join(stackDir, ".felhom.yml"), "display_name: Example\nhealthcheck:\n  checks:\n    - type: api\n      port: 8999\n") // flowed by the sync
	mustWrite(t, stacks.AppliedMetaFile(stackDir), "display_name: Example\nhealthcheck:\n  checks:\n    - type: api\n      port: 80\n")     // the pinned version's
	mustWrite(t, filepath.Join(stackDir, "app.yaml"), "deployed: true\nenv: {}\n")
	m := &Manager{
		logger:         log.New(io.Discard, "", 0),
		systemDataPath: filepath.Join(tmp, "system"),
		stackProvider:  &fakeRecoveryProvider{info: RecoveryInfo{StackDir: stackDir, DisplayName: "Example", ImagePins: []string{"example/app:1.2.3"}}, hdd: drive},
		version:        "vtest",
	}
	if err := m.CaptureRecoveryUnit("example"); err != nil {
		t.Fatalf("capture: %v", err)
	}
	b, err := os.ReadFile(filepath.Join(RecoveryUnitComposePath(drive, "example"), ".felhom.yml"))
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(string(b), "8999") || !strings.Contains(string(b), "port: 80") {
		t.Fatalf("the unit carries the failing step's probe, not the pinned version's:\n%s", b)
	}
	// Control: no applied record (an app pinned before v0.263.2) → the stack dir's file, as before.
	if err := os.RemoveAll(filepath.Dir(stacks.AppliedMetaFile(stackDir))); err != nil {
		t.Fatal(err)
	}
	mustWrite(t, filepath.Join(stackDir, ".felhom.yml"), "display_name: Example changed\n") // force a recapture
	if err := m.CaptureRecoveryUnit("example"); err != nil {
		t.Fatal(err)
	}
	b, _ = os.ReadFile(filepath.Join(RecoveryUnitComposePath(drive, "example"), ".felhom.yml"))
	if !strings.Contains(string(b), "Example changed") {
		t.Fatalf("without an applied record the stack dir's file must be captured: %s", b)
	}
}