/*
Copyright 2026.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package v1alpha1

import (
	"reflect"
	"testing"
)

func TestEffectivePort(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name string
		spec ProxySpec
		want int32
	}{
		{
			name: "managed with explicit port",
			spec: ProxySpec{Mode: ModeManaged, Port: 8080},
			want: 8080,
		},
		{
			name: "managed with unset port falls back to default",
			spec: ProxySpec{Mode: ModeManaged},
			want: DefaultPort,
		},
		{
			name: "external with explicit endpoint port",
			spec: ProxySpec{Mode: ModeExternal, Endpoint: &EndpointSpec{Host: "1.2.3.4", Port: 9999}},
			want: 9999,
		},
		{
			name: "external with unset endpoint port falls back to default",
			spec: ProxySpec{Mode: ModeExternal, Endpoint: &EndpointSpec{Host: "1.2.3.4"}},
			want: DefaultPort,
		},
		{
			name: "external with nil endpoint falls back to spec.port",
			spec: ProxySpec{Mode: ModeExternal, Port: 3000},
			want: 3000,
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			p := &Proxy{Spec: tc.spec}
			if got := p.EffectivePort(); got != tc.want {
				t.Errorf("EffectivePort() = %d, want %d", got, tc.want)
			}
		})
	}
}

func TestEffectiveHost(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name   string
		spec   ProxySpec
		status ProxyStatus
		want   string
	}{
		{
			name:   "managed uses status.ip",
			spec:   ProxySpec{Mode: ModeManaged},
			status: ProxyStatus{IP: "10.0.0.5"},
			want:   "10.0.0.5",
		},
		{
			name: "external uses endpoint.host",
			spec: ProxySpec{Mode: ModeExternal, Endpoint: &EndpointSpec{Host: "proxy.example.com"}},
			want: "proxy.example.com",
		},
		{
			name:   "external with nil endpoint falls back to status.ip",
			spec:   ProxySpec{Mode: ModeExternal},
			status: ProxyStatus{IP: "10.0.0.6"},
			want:   "10.0.0.6",
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			p := &Proxy{Spec: tc.spec, Status: tc.status}
			if got := p.EffectiveHost(); got != tc.want {
				t.Errorf("EffectiveHost() = %q, want %q", got, tc.want)
			}
		})
	}
}

func TestHealthCheckOrDefault(t *testing.T) {
	t.Parallel()
	fullDefault := HealthCheckSpec{
		ProbeURL:            DefaultProbeURL,
		IntervalSeconds:     DefaultHealthCheckIntervalSeconds,
		TimeoutSeconds:      DefaultHealthCheckTimeoutSeconds,
		FailureThreshold:    DefaultFailureThreshold,
		SuccessThreshold:    DefaultSuccessThreshold,
		ExpectedStatusCodes: []int32{200, 204},
	}

	t.Run("nil healthCheck returns full default", func(t *testing.T) {
		t.Parallel()
		p := &Proxy{Spec: ProxySpec{}}
		got := p.HealthCheckOrDefault()
		if !reflect.DeepEqual(got, fullDefault) {
			t.Errorf("HealthCheckOrDefault() = %+v, want %+v", got, fullDefault)
		}
	})

	t.Run("partial healthCheck fills only unset fields", func(t *testing.T) {
		t.Parallel()
		p := &Proxy{Spec: ProxySpec{HealthCheck: &HealthCheckSpec{
			ProbeURL:         "http://internal/probe",
			FailureThreshold: 7,
		}}}
		got := p.HealthCheckOrDefault()
		want := fullDefault
		want.ProbeURL = "http://internal/probe"
		want.FailureThreshold = 7
		if !reflect.DeepEqual(got, want) {
			t.Errorf("HealthCheckOrDefault() = %+v, want %+v", got, want)
		}
	})

	t.Run("fully set healthCheck passes through unchanged", func(t *testing.T) {
		t.Parallel()
		custom := HealthCheckSpec{
			ProbeURL:            "http://internal/probe",
			IntervalSeconds:     10,
			TimeoutSeconds:      2,
			FailureThreshold:    5,
			SuccessThreshold:    2,
			ExpectedStatusCodes: []int32{200},
		}
		p := &Proxy{Spec: ProxySpec{HealthCheck: &custom}}
		got := p.HealthCheckOrDefault()
		if !reflect.DeepEqual(got, custom) {
			t.Errorf("HealthCheckOrDefault() = %+v, want %+v", got, custom)
		}
	})

	t.Run("does not mutate the original spec", func(t *testing.T) {
		t.Parallel()
		hc := &HealthCheckSpec{ProbeURL: "http://internal/probe"}
		p := &Proxy{Spec: ProxySpec{HealthCheck: hc}}
		_ = p.HealthCheckOrDefault()
		if hc.IntervalSeconds != 0 {
			t.Errorf("original HealthCheckSpec was mutated: IntervalSeconds = %d, want 0", hc.IntervalSeconds)
		}
	})
}

func TestMaxLeasesOrDefault(t *testing.T) {
	t.Parallel()
	zero := int32(0)
	seven := int32(7)
	tests := []struct {
		name string
		spec ProxySpec
		want int32
	}{
		{name: "unset falls back to default", spec: ProxySpec{}, want: DefaultMaxLeases},
		{name: "explicit zero is preserved (unleasable)", spec: ProxySpec{MaxLeases: &zero}, want: 0},
		{name: "explicit non-zero is preserved", spec: ProxySpec{MaxLeases: &seven}, want: 7},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			p := &Proxy{Spec: tc.spec}
			if got := p.MaxLeasesOrDefault(); got != tc.want {
				t.Errorf("MaxLeasesOrDefault() = %d, want %d", got, tc.want)
			}
		})
	}
}