package sync

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

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

// R-971 — the 15-minute correction refuses a catalog definition the box's allow-list does not admit: the deployed
// app keeps its last good compose AND its .felhom.yml (nothing of the app moves this cycle), read back off disk.

const tplOldFixedPrivileged = `services:
  web:
    image: nextcloud:31.0.14-apache
    privileged: true
    healthcheck:
      test: ["CMD", "curl", "-fsS", "http://127.0.0.1:80/status.php"]
`

// RED-PROOF (P2/redproof-allowlist.txt): with the admit call removed from copyTemplates, the live compose gains
// `privileged: true` and this test fails.
func TestR971_RefusedCorrectionWritesNothing(t *testing.T) {
	for _, wired := range []bool{true, false} { // the manager's check, and the syncer's own placeholder-env check
		s, stackDir, _ := renderFixture(t, tplOldFixedPrivileged)
		live := filepath.Join(stackDir, "docker-compose.yml")
		meta := filepath.Join(stackDir, ".felhom.yml")
		write(t, live, tplOld)
		write(t, meta, "OLD META\n")
		write(t, stacks.AppliedComposePath(stackDir), tplOld)
		s.SetRenderPlanFn(pinnedPlan(stackDir, map[string]string{"web": "nextcloud:31.0.14-apache"}, true))
		asked := 0
		if wired {
			s.SetAdmitFn(func(app string, data []byte) error {
				asked++
				return s.admit2(app, data)
			})
		}
		_, updated, err := s.copyTemplates()
		if err != nil {
			t.Fatal(err)
		}
		if got := readFile(t, live); got != tplOld {
			t.Fatalf("[wired=%v] the refused definition reached the live compose:\n%s", wired, got)
		}
		// The app is not reported updated, so the post-sync hook does not redeploy it: it keeps running as it was.
		for _, u := range updated {
			if u == "nextcloud" {
				t.Fatalf("[wired=%v] a refused app was reported updated — the post-sync redeploy would touch it", wired)
			}
		}
		if got := readFile(t, meta); got != "OLD META\n" {
			t.Fatalf("[wired=%v] the .felhom.yml of a refused app moved: %q", wired, got)
		}
		if wired && asked == 0 {
			t.Fatal("the manager's check was never asked")
		}
	}
}

// admit2 is the placeholder-env check (what an unwired syncer uses), callable from the wired case.
func (s *Syncer) admit2(app string, data []byte) error {
	saved := s.admitFn
	s.admitFn = nil
	defer func() { s.admitFn = saved }()
	return s.admit(app, data)
}

// Positive control: the same fix without the privilege flows exactly as before (Group A's assertion).
func TestR971_AdmittedCorrectionStillFlows(t *testing.T) {
	s, stackDir, _ := renderFixture(t, tplOldFixed)
	live := filepath.Join(stackDir, "docker-compose.yml")
	write(t, live, tplOld)
	write(t, stacks.AppliedComposePath(stackDir), tplOld)
	s.SetRenderPlanFn(pinnedPlan(stackDir, map[string]string{"web": "nextcloud:31.0.14-apache"}, true))
	if _, _, err := s.copyTemplates(); err != nil {
		t.Fatal(err)
	}
	if got := readFile(t, live); !strings.Contains(got, "status.php") {
		t.Fatalf("an admitted fix did not flow:\n%s", got)
	}
}

// A catalog template named like a controller infra stack never lands in that stack's directory.
func TestR971_CatalogNeverWritesAnInfraStack(t *testing.T) {
	root := t.TempDir()
	cfg := &config.Config{}
	cfg.Paths.DataDir = filepath.Join(root, "data")
	cfg.Paths.StacksDir = filepath.Join(root, "stacks")
	for _, name := range []string{"traefik", "cloudflared", "filebrowser", "samba", "felhom-controller"} {
		cat := filepath.Join(cfg.Paths.DataDir, "catalog-cache", "templates", name)
		dst := filepath.Join(cfg.Paths.StacksDir, name)
		for _, d := range []string{cat, dst} {
			if err := os.MkdirAll(d, 0o755); err != nil {
				t.Fatal(err)
			}
		}
		write(t, filepath.Join(cat, "docker-compose.yml"), "services:\n  x:\n    image: evil/x:1\n")
		write(t, filepath.Join(dst, "docker-compose.yml"), "CONTROLLER RENDERED\n")
	}
	s := New(cfg, log.New(io.Discard, "", 0), func() error { return nil }, nil)
	if _, _, err := s.copyTemplates(); err != nil {
		t.Fatal(err)
	}
	for _, name := range []string{"traefik", "cloudflared", "filebrowser", "samba", "felhom-controller"} {
		if got := readFile(t, filepath.Join(cfg.Paths.StacksDir, name, "docker-compose.yml")); got != "CONTROLLER RENDERED\n" {
			t.Errorf("%s: the catalog overwrote the controller's own compose: %q", name, got)
		}
	}
}

// An app that is not installed: its refused template is not written either (the install would refuse it again).
func TestR971_RefusedTemplateOfAnAppNotInstalled(t *testing.T) {
	s, stackDir, _ := renderFixture(t, tplOldFixedPrivileged)
	live := filepath.Join(stackDir, "docker-compose.yml")
	write(t, live, tplOld)
	if _, _, err := s.copyTemplates(); err != nil {
		t.Fatal(err)
	}
	if got := readFile(t, live); got != tplOld {
		t.Fatalf("a refused template was written for an app not installed:\n%s", got)
	}
}