package traefik

import (
	"errors"
	"reflect"
	"testing"
)

func nodeConfig(t *testing.T, host, name, domain string) *Configuration {
	t.Helper()
	c, err := FromLabels(host, map[string]string{
		"traefik.enable":                                              "true",
		"traefik.http.routers." + name + ".rule":                      "Host(`" + domain + "`)",
		"traefik.http.services." + name + ".loadbalancer.server.port": "80",
		"traefik.http.middlewares." + name + "-gzip.compress":         "true",
	})
	if err != nil {
		t.Fatalf("FromLabels: %v", err)
	}
	return c
}

func TestMerge_Disjoint(t *testing.T) {
	a := nodeConfig(t, "10.0.0.1", "a", "a.de")
	b := nodeConfig(t, "10.0.0.2", "b", "b.de")

	got, err := Merge(a, nil, &Configuration{}, b)
	if err != nil {
		t.Fatalf("unerwarteter Fehler: %v", err)
	}
	for _, name := range []string{"a", "b"} {
		if got.HTTP.Routers[name] == nil || got.HTTP.Services[name] == nil || got.HTTP.Middlewares[name+"-gzip"] == nil {
			t.Errorf("%s fehlt in %s", name, mustJSON(t, got))
		}
	}
	if n := len(a.HTTP.Routers); n != 1 {
		t.Errorf("Eingabe wurde verändert: %d Router in a", n)
	}
}

func TestMerge_IdenticalDuplicateAllowed(t *testing.T) {
	a := nodeConfig(t, "10.0.0.1", "a", "a.de")
	again := nodeConfig(t, "10.0.0.1", "a", "a.de")

	got, err := Merge(a, again)
	if err != nil {
		t.Fatalf("unerwarteter Fehler: %v", err)
	}
	if !reflect.DeepEqual(got, a) {
		t.Errorf("erwartet %s, bekommen %s", mustJSON(t, a), mustJSON(t, got))
	}
}

func TestMerge_Conflicts(t *testing.T) {
	a := nodeConfig(t, "10.0.0.1", "a", "a.de")
	sameNameOtherHost := nodeConfig(t, "10.0.0.2", "a", "a.de")
	sameNameOtherRule := nodeConfig(t, "10.0.0.1", "a", "evil.de")
	otherMiddleware := &Configuration{HTTP: &HTTPConfiguration{
		Middlewares: map[string]Middleware{"a-gzip": {"compress": "false"}},
	}}

	tests := map[string]*Configuration{
		"Service":    sameNameOtherHost,
		"Router":     sameNameOtherRule,
		"Middleware": otherMiddleware,
	}
	for name, other := range tests {
		t.Run(name, func(t *testing.T) {
			got, err := Merge(a, other)
			if !errors.Is(err, ErrConflict) {
				t.Fatalf("erwartet ErrConflict, bekommen %v", err)
			}
			if got != nil {
				t.Errorf("bei Konflikt erwartet nil, bekommen %+v", got)
			}
		})
	}
}

func TestMerge_Empty(t *testing.T) {
	for _, in := range [][]*Configuration{nil, {nil}, {{}}, {{HTTP: &HTTPConfiguration{}}}} {
		got, err := Merge(in...)
		if err != nil {
			t.Fatalf("unerwarteter Fehler: %v", err)
		}
		if got == nil || got.HTTP != nil {
			t.Errorf("erwartet leere Konfiguration, bekommen %+v", got)
		}
	}
}