package stacks

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

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

// r553Manager builds a real Manager over a temp stacks dir holding one app fixture, so DeployStack's
// own validation runs — no stub, no modelled predicate.
func r553Manager(t *testing.T, felhomYml string) *Manager {
	t.Helper()
	dir := t.TempDir()
	cfg := &config.Config{}
	cfg.Paths.StacksDir = filepath.Join(dir, "stacks")
	cfg.Paths.SystemDataPath = filepath.Join(dir, "system")
	cfg.Stacks.ComposeCommand = "docker compose" // no detection; nothing is executed in this test
	appDir := filepath.Join(cfg.Paths.StacksDir, "r553app")
	if err := os.MkdirAll(appDir, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(appDir, "docker-compose.yml"), []byte("services:\n  app:\n    image: busybox\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(appDir, ".felhom.yml"), []byte(felhomYml), 0o644); err != nil {
		t.Fatal(err)
	}
	m, err := NewManager(cfg, log.New(io.Discard, "", 0))
	if err != nil {
		t.Fatal(err)
	}
	if err := m.ScanStacks(); err != nil {
		t.Fatal(err)
	}
	if _, ok := m.GetStack("r553app"); !ok {
		t.Fatal("fixture invalid: the app was not scanned, so DeployStack would refuse for the wrong reason")
	}
	return m
}

// R-553 — the deploy refusals carry their KIND, and their Hungarian sentences are byte-for-byte what
// they were before the kinds existed (a localisation-adjacent change may not move one byte of copy).
//
// RED-PROOF (REPORT): drop the kind from either producer in deploy.go (back to plain fmt.Errorf) and
// the errors.Is assertion fails, while the message assertion still passes — which is exactly the
// silent state this row exists to prevent.
func TestR553_DeployProducersCarryKindAndKeepTheirWords(t *testing.T) {
	cases := []struct {
		name    string
		yml     string
		values  map[string]string
		kind    error
		wantMsg string
	}{
		{
			name:    "required field left empty",
			yml:     "display_name: R553\ndeploy_fields:\n  - env_var: DATA_DIR\n    label: Adatmappa\n    type: text\n    required: true\n",
			values:  map[string]string{},
			kind:    ErrRequiredField,
			wantMsg: `a(z) "Adatmappa" (DATA_DIR) mező kitöltése kötelező`,
		},
		{
			name:    "password field left empty",
			yml:     "display_name: R553\ndeploy_fields:\n  - env_var: ADMIN_PW\n    label: Jelszó\n    type: password\n",
			values:  map[string]string{},
			kind:    ErrRequiredField,
			wantMsg: `a(z) "Jelszó" mező kitöltése kötelező — használja a Generálás gombot vagy írjon be egy jelszót`,
		},
		{
			name:    "path field naming something that is not there",
			yml:     "display_name: R553\ndeploy_fields:\n  - env_var: MEDIA\n    label: Média\n    type: path\n",
			values:  map[string]string{"MEDIA": "/definitely/not/here/r553"},
			kind:    ErrPathMissing,
			wantMsg: `path "/definitely/not/here/r553" does not exist for field "Média"`,
		},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			m := r553Manager(t, c.yml)
			_, err := m.DeployStack(DeployRequest{StackName: "r553app", Values: c.values})
			if err == nil {
				t.Fatal("deploy was admitted — the fixture no longer exercises the refusal")
			}
			if !errors.Is(err, c.kind) {
				t.Errorf("refusal carries no kind: %v (want errors.Is … %v)", err, c.kind)
			}
			if err.Error() != c.wantMsg {
				t.Errorf("the customer's sentence CHANGED:\n got %q\nwant %q", err.Error(), c.wantMsg)
			}
		})
	}
}

// The already-deployed refusal, on the same Manager: its words are unchanged and it carries its kind
// (the API answers 409 from that kind).
func TestR553_AlreadyDeployedCarriesKindAndKeepsItsWords(t *testing.T) {
	m := r553Manager(t, "display_name: R553\n")
	m.mu.Lock()
	m.stacks["r553app"].Deployed = true
	m.mu.Unlock()
	_, err := m.DeployStack(DeployRequest{StackName: "r553app"})
	if err == nil {
		t.Fatal("a deployed stack was admitted for a second deploy")
	}
	if !errors.Is(err, ErrAlreadyDeployed) {
		t.Errorf("refusal carries no kind: %v", err)
	}
	if want := `stack "r553app" is already deployed; use update instead`; err.Error() != want {
		t.Errorf("message CHANGED:\n got %q\nwant %q", err.Error(), want)
	}
}

// The memory refusal is built by memoryVerdict from the HOST's real memory, so a unit test cannot
// make it fire. Two halves therefore, and v0.253.0 (R-557) turned the weaker one into the stronger:
//
//   - BEHAVIOUR: the value memoryVerdict now returns is an ERROR it builds itself, so the test can
//     build the same value and check it — the kind is reachable by errors.Is AND the sentence is the
//     one the customer used to read, byte for byte, in Hungarian. That is no longer a source check.
//   - SOURCE: memoryVerdict still hands that error back rather than a sentence. The defect this
//     guards is a call written the old way, and only the source can show that.
func TestR553_MemoryRefusalIsWrappedWithItsKind(t *testing.T) {
	// The exact value the producer returns, for a 900 MB request that does not fit.
	e := util.MsgErrorf(ErrNotEnoughMemory, "err.stacks.not_enough_memory", 900, 100, 2048, 1436, 512)

	if !errors.Is(e, ErrNotEnoughMemory) {
		t.Error("the memory refusal does not carry ErrNotEnoughMemory — the API would answer 500 " +
			"for a refusal the customer can act on")
	}
	const wantHU = "Nincs elég memória az alkalmazás telepítéséhez. Szükséges: 900 MB, Elérhető: 100 MB " +
		"(összesen: 2048 MB, ebből 1436 MB használt, 512 MB rendszer számára fenntartva)"
	if e.Error() != wantHU {
		t.Errorf("the Hungarian refusal moved:\n got %q\nwant %q", e.Error(), wantHU)
	}
	if en := util.ErrText("en", e); en == wantHU || en == "" {
		t.Errorf("the refusal has no English of its own: %q", en)
	}

	src, err := os.ReadFile("deploy.go")
	if err != nil {
		t.Fatal(err)
	}
	body := string(src)
	if !strings.Contains(body, `util.MsgErrorf(ErrNotEnoughMemory, "err.stacks.not_enough_memory"`) {
		t.Error("memoryVerdict no longer builds its refusal with ErrNotEnoughMemory and its key")
	}
	if strings.Contains(body, `errors.New(refusal)`) || strings.Contains(body, `fmt.Errorf(refusal)`) {
		t.Error("the memory refusal is back to a bare error: its kind is gone (R-553)")
	}
}