package configuration

import (
	"reflect"
	"testing"

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

type localConfiguration struct {
	Version       Version `yaml:"version"`
	Log           *Log    `yaml:"log"`
	Notifications []Notif `yaml:"notifications,omitempty"`
	Inlined       Inlined `yaml:",inline"`
}

type Notif struct {
	Name string `yaml:"name"`
}

type Inlined struct {
	FirstValue  string `yaml:"firstValue"`
	SecondValue string `yaml:"secondValue"`
}

var expectedConfig = localConfiguration{
	Version: "0.1",
	Log: &Log{
		Formatter: "json",
	},
	Notifications: []Notif{
		{Name: "foo"},
		{Name: "bar"},
		{Name: "car"},
	},
}

const testConfig = `version: "0.1"
log:
  formatter: "text"
notifications:
  - name: "foo"
  - name: "bar"
  - name: "car"`

func TestParserOverwriteIninitializedPoiner(t *testing.T) {
	config := localConfiguration{}

	t.Setenv("REGISTRY_LOG_FORMATTER", "json")

	p := NewParser("registry", []VersionedParseInfo{
		{
			Version: "0.1",
			ParseAs: reflect.TypeFor[localConfiguration](),
			ConversionFunc: func(c any) (any, error) {
				return c, nil
			},
		},
	})

	err := p.Parse([]byte(testConfig), &config)
	require.NoError(t, err)
	require.Equal(t, expectedConfig, config)
}

const testConfig2 = `version: "0.1"
log:
  formatter: "text"
notifications:
  - name: "val1"
  - name: "val2"
  - name: "car"`

func TestParseOverwriteUnininitializedPoiner(t *testing.T) {
	config := localConfiguration{}

	t.Setenv("REGISTRY_LOG_FORMATTER", "json")

	// override only first two notificationsvalues
	// in the tetConfig: leave the last value unchanged.
	t.Setenv("REGISTRY_NOTIFICATIONS_0_NAME", "foo")
	t.Setenv("REGISTRY_NOTIFICATIONS_1_NAME", "bar")

	p := NewParser("registry", []VersionedParseInfo{
		{
			Version: "0.1",
			ParseAs: reflect.TypeFor[localConfiguration](),
			ConversionFunc: func(c any) (any, error) {
				return c, nil
			},
		},
	})

	err := p.Parse([]byte(testConfig2), &config)
	require.NoError(t, err)
	require.Equal(t, expectedConfig, config)
}

const testConfig3 = `version: "0.1"
log:
  formatter: "text"`

func TestParseInlinedStruct(t *testing.T) {
	config := localConfiguration{}

	expected := localConfiguration{
		Version: "0.1",
		Log: &Log{
			Formatter: "text",
		},
		Inlined: Inlined{
			FirstValue:  "foo",
			SecondValue: "bar",
		},
	}

	// Test without inlined struct name in the env variable name
	t.Setenv("REGISTRY_FIRSTVALUE", "foo")
	// Test with the inlined struct name in the env variable name, for backward compatibility
	t.Setenv("REGISTRY_INLINED_SECONDVALUE", "bar")

	p := NewParser("registry", []VersionedParseInfo{
		{
			Version: "0.1",
			ParseAs: reflect.TypeFor[localConfiguration](),
			ConversionFunc: func(c any) (any, error) {
				return c, nil
			},
		},
	})

	err := p.Parse([]byte(testConfig3), &config)
	require.NoError(t, err)
	require.Equal(t, expected, config)
}