package demos

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

	"go.yaml.in/yaml/v2"

	"github.com/omnex/control-plane/api/internal/config"
)

func ptr[T any](v T) *T { return &v }

func TestNextReplicas_SuspendThenResumeRestoresOriginalCount(t *testing.T) {
	annotations := map[string]string{}
	current := ptr(int32(3))

	target, changed := nextReplicas(current, &annotations, false)
	if !changed || target != 0 {
		t.Fatalf("suspension: target=%d changed=%v", target, changed)
	}
	if annotations[replicasBeforeSuspendAnnotation] != "3" {
		t.Fatalf("annotation=%q, attendu 3", annotations[replicasBeforeSuspendAnnotation])
	}

	// Déjà à 0 : suspendre à nouveau ne doit pas écraser l'annotation.
	current = ptr(int32(0))
	if _, changed := nextReplicas(current, &annotations, false); changed {
		t.Error("suspension répétée non idempotente")
	}
	if annotations[replicasBeforeSuspendAnnotation] != "3" {
		t.Error("l'annotation a été écrasée")
	}

	target, changed = nextReplicas(current, &annotations, true)
	if !changed || target != 3 {
		t.Fatalf("relance: target=%d changed=%v, attendu 3", target, changed)
	}
	if _, still := annotations[replicasBeforeSuspendAnnotation]; still {
		t.Error("annotation non nettoyée après la relance")
	}
}

func TestNextReplicas_ResumeWithoutAnnotationDefaultsToOne(t *testing.T) {
	annotations := map[string]string{}
	target, changed := nextReplicas(ptr(int32(0)), &annotations, true)
	if !changed || target != 1 {
		t.Errorf("target=%d changed=%v, attendu 1", target, changed)
	}
}

func TestNextReplicas_ResumeRunningWorkloadIsNoop(t *testing.T) {
	annotations := map[string]string{}
	if _, changed := nextReplicas(ptr(int32(2)), &annotations, true); changed {
		t.Error("relance d'une charge déjà active")
	}
}

// TestVitrineValuesRenderWithCharts génère les valeurs comme ProvisionProject
// puis rend les charts de deploy/chart-vitrine avec helm : garantit que les
// clés attendues existent, que les validations des charts passent et que les
// noms de Services calculés côté Go sont bien ceux des charts.
func TestVitrineValuesRenderWithCharts(t *testing.T) {
	if _, err := exec.LookPath("helm"); err != nil {
		t.Skip("helm absent du PATH")
	}
	chartsDir, err := filepath.Abs("../../../../deploy/chart-vitrine")
	if err != nil {
		t.Fatal(err)
	}

	h := &HelmProvisioner{cfg: &config.Config{
		VitrineBackendImage:  "registry.example/vitrine-backend:1.2.3",
		VitrineFrontendImage: "registry.example/vitrine-frontend:1.2.3",
	}}
	p := ProjectSpec{
		Namespace:     "vitrine-ab12cd34",
		Host:          "vitrine-ab12cd34.vitrine-omnex.club",
		URL:           "https://vitrine-ab12cd34.vitrine-omnex.club",
		AdminUsername: "admin",
		AdminPassword: "un-mot-de-passe-solide",
		AdminNumber:   3,
	}

	cases := []struct {
		chart  string
		values map[string]interface{}
		wants  []string
	}{
		{"postgresql", h.buildVitrinePostgresValues("pgpass"), []string{"name: postgres\n"}},
		{"redis", h.buildVitrineRedisValues("redispass"), []string{"name: redis\n"}},
		{"backend", h.buildVitrineBackendValues(p, "pgpass", "redispass", "jwt"), []string{
			"name: " + vitrineBackendService(p.Namespace) + "\n",
			`ADMIN_NUMBER: "3"`,
			`SEED_ADMIN_USERNAME: "admin"`,
			"registry.example/vitrine-backend:1.2.3",
			"post-install", // seedJob activé
			"postgres://postgres:pgpass@postgres:5432/vitrine_db",
		}},
		{"frontend", h.buildVitrineFrontendValues(), []string{
			"name: " + vitrineFrontendService(p.Namespace) + "\n",
			"registry.example/vitrine-frontend:1.2.3",
		}},
		{"ingressroute", h.buildVitrineIngressRouteValues(p), []string{
			"Host(`vitrine-ab12cd34.vitrine-omnex.club`)",
			"name: " + vitrineBackendService(p.Namespace) + "\n",
			"name: " + vitrineFrontendService(p.Namespace) + "\n",
			"tls: {}", // certificat servi par le TLSStore, pas par projet
		}},
	}
	for _, c := range cases {
		t.Run(c.chart, func(t *testing.T) {
			raw, err := yaml.Marshal(c.values)
			if err != nil {
				t.Fatal(err)
			}
			valuesFile := filepath.Join(t.TempDir(), "values.yaml")
			if err := writeFile(valuesFile, raw); err != nil {
				t.Fatal(err)
			}
			// Release et namespace comme installChartFrom : "<ns>-<chart>".
			out, err := exec.Command("helm", "template", p.Namespace+"-"+c.chart,
				filepath.Join(chartsDir, c.chart), "--namespace", p.Namespace, "--values", valuesFile).CombinedOutput()
			if err != nil {
				t.Fatalf("helm template: %v\n%s", err, out)
			}
			for _, want := range c.wants {
				if !strings.Contains(string(out), want) {
					t.Errorf("rendu de %s : %q introuvable", c.chart, want)
				}
			}
		})
	}
}

func writeFile(path string, data []byte) error { return os.WriteFile(path, data, 0o600) }