package gateway

import (
	"testing"

	"github.com/stretchr/testify/assert"
	gatev1 "sigs.k8s.io/gateway-api/apis/v1"
)

func Test_hostSNIRule(t *testing.T) {
	testCases := []struct {
		desc         string
		hostnames    []gatev1.Hostname
		expectedRule string
		expectError  bool
	}{
		{
			desc:         "Empty",
			expectedRule: "HostSNI(`*`)",
		},
		{
			desc:         "Empty hostname",
			hostnames:    []gatev1.Hostname{""},
			expectedRule: "HostSNI(`*`)",
		},
		{
			desc:         "Supported wildcard",
			hostnames:    []gatev1.Hostname{"*.foo"},
			expectedRule: "HostSNIRegexp(`^[a-z0-9-\\.]+\\.foo$`)",
		},
		{
			desc:         "Some empty hostnames",
			hostnames:    []gatev1.Hostname{"foo", "", "bar"},
			expectedRule: "HostSNI(`foo`) || HostSNI(`bar`)",
		},
		{
			desc:         "Valid hostname",
			hostnames:    []gatev1.Hostname{"foo"},
			expectedRule: "HostSNI(`foo`)",
		},
		{
			desc:         "Multiple valid hostnames",
			hostnames:    []gatev1.Hostname{"foo", "bar"},
			expectedRule: "HostSNI(`foo`) || HostSNI(`bar`)",
		},
		{
			desc:         "Multiple valid hostnames with wildcard",
			hostnames:    []gatev1.Hostname{"bar.foo", "foo.foo", "*.foo"},
			expectedRule: "HostSNI(`bar.foo`) || HostSNI(`foo.foo`) || HostSNIRegexp(`^[a-z0-9-\\.]+\\.foo$`)",
		},
		{
			desc:         "Multiple overlapping hostnames",
			hostnames:    []gatev1.Hostname{"foo", "bar", "foo", "baz"},
			expectedRule: "HostSNI(`foo`) || HostSNI(`bar`) || HostSNI(`baz`)",
		},
	}

	for _, test := range testCases {
		t.Run(test.desc, func(t *testing.T) {
			t.Parallel()

			rule := hostSNIRule(test.hostnames)
			assert.Equal(t, test.expectedRule, rule)
		})
	}
}