// Copyright The OpenTelemetry Authors
//
// 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 featuregate

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestRegistry(t *testing.T) {
	r := Registry{gates: map[string]Gate{}}

	gate := Gate{
		ID:          "foo",
		Description: "Test Gate",
		Enabled:     true,
	}

	assert.Empty(t, r.List())
	assert.False(t, r.IsEnabled(gate.ID))

	assert.NoError(t, r.Register(gate))
	assert.Len(t, r.List(), 1)
	assert.True(t, r.IsEnabled(gate.ID))

	assert.NoError(t, r.Apply(map[string]bool{gate.ID: false}))
	assert.False(t, r.IsEnabled(gate.ID))

	assert.Error(t, r.Register(gate))
	assert.Panics(t, func() {
		r.MustRegister(gate)
	})
}

func TestRegistryWithErrorApply(t *testing.T) {
	r := Registry{gates: map[string]Gate{}}
	gate := Gate{
		ID:          "foo",
		Description: "Test Gate",
		Enabled:     true,
	}
	assert.NoError(t, r.Register(gate))

	tests := []struct {
		name        string
		gate        string
		enabled     bool
		shouldError bool
	}{
		{
			name:        "existing_gate",
			gate:        "foo",
			enabled:     false,
			shouldError: false,
		},
		{
			name:        "none_existing_gate",
			gate:        "bar",
			enabled:     false,
			shouldError: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.shouldError {
				assert.Error(t, r.Apply(map[string]bool{tt.gate: tt.enabled}))
				return
			}
			assert.NoError(t, r.Apply(map[string]bool{tt.gate: tt.enabled}))
			assert.Equal(t, tt.enabled, r.IsEnabled(tt.gate))
		})
	}
}
