// SPDX-License-Identifier: Apache-2.0
//
// Copyright The Prometheus 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.

//go:build windows

package mi_test

import (
	"testing"
	"time"

	"github.com/prometheus-community/windows_exporter/internal/mi"
	"github.com/prometheus-community/windows_exporter/internal/utils/testutils"
	"github.com/stretchr/testify/require"
	"golang.org/x/sys/windows"
)

type win32Process struct {
	Name string `mi:"Name"`
}

func Test_MI_Application_Initialize(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	err = application.Close()
	require.NoError(t, err)
}

func Test_MI_Application_TestConnection(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	destinationOptions, err := application.NewDestinationOptions()
	require.NoError(t, err)
	require.NotEmpty(t, destinationOptions)

	err = destinationOptions.SetTimeout(1 * time.Second)
	require.NoError(t, err)

	err = destinationOptions.SetLocale(mi.LocaleEnglish)
	require.NoError(t, err)

	session, err := application.NewSession(destinationOptions)
	require.NoError(t, err)
	require.NotEmpty(t, session)

	err = session.TestConnection()
	require.NoError(t, err)
	require.NotEmpty(t, session)

	err = session.Close()
	require.NoError(t, err)

	err = application.Close()
	require.NoError(t, err)
}

func Test_MI_Query(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	destinationOptions, err := application.NewDestinationOptions()
	require.NoError(t, err)
	require.NotEmpty(t, destinationOptions)

	err = destinationOptions.SetTimeout(1 * time.Second)
	require.NoError(t, err)

	err = destinationOptions.SetLocale(mi.LocaleEnglish)
	require.NoError(t, err)

	session, err := application.NewSession(destinationOptions)
	require.NoError(t, err)
	require.NotEmpty(t, session)

	operation, err := session.QueryInstances(mi.OperationFlagsStandardRTTI, nil, mi.NamespaceRootCIMv2, mi.QueryDialectWQL, "select Name from win32_process where handle = 0")

	require.NoError(t, err)
	require.NotEmpty(t, operation)

	instance, moreResults, err := operation.GetInstance()
	require.NoError(t, err)
	require.NotEmpty(t, instance)

	count, err := instance.GetElementCount()
	require.NoError(t, err)
	require.NotZero(t, count)

	element, err := instance.GetElement("Name")
	require.NoError(t, err)
	require.NotEmpty(t, element)

	value, err := element.GetValue()
	require.NoError(t, err)
	require.Equal(t, "System Idle Process", value)
	require.NotEmpty(t, value)

	require.False(t, moreResults)

	err = operation.Close()
	require.NoError(t, err)

	err = session.Close()
	require.NoError(t, err)

	err = application.Close()
	require.NoError(t, err)
}

func Test_MI_QueryUnmarshal(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	destinationOptions, err := application.NewDestinationOptions()
	require.NoError(t, err)
	require.NotEmpty(t, destinationOptions)

	err = destinationOptions.SetTimeout(1 * time.Second)
	require.NoError(t, err)

	err = destinationOptions.SetLocale(mi.LocaleEnglish)
	require.NoError(t, err)

	session, err := application.NewSession(destinationOptions)
	require.NoError(t, err)
	require.NotEmpty(t, session)

	var processes []win32Process

	queryProcess, err := mi.NewQuery("select Name from win32_process where handle = 0")
	require.NoError(t, err)

	err = session.QueryUnmarshal(&processes, mi.OperationFlagsStandardRTTI, nil, mi.NamespaceRootCIMv2, mi.QueryDialectWQL, queryProcess)
	require.NoError(t, err)
	require.Equal(t, []win32Process{{Name: "System Idle Process"}}, processes)

	err = session.Close()
	require.NoError(t, err)

	err = application.Close()
	require.NoError(t, err)
}

func Test_MI_EmptyQuery(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	destinationOptions, err := application.NewDestinationOptions()
	require.NoError(t, err)
	require.NotEmpty(t, destinationOptions)

	err = destinationOptions.SetTimeout(1 * time.Second)
	require.NoError(t, err)

	err = destinationOptions.SetLocale(mi.LocaleEnglish)
	require.NoError(t, err)

	session, err := application.NewSession(destinationOptions)
	require.NoError(t, err)
	require.NotEmpty(t, session)

	operation, err := session.QueryInstances(mi.OperationFlagsStandardRTTI, nil, mi.NamespaceRootCIMv2, mi.QueryDialectWQL, "SELECT Name, Status FROM win32_PrintJob")

	require.NoError(t, err)
	require.NotEmpty(t, operation)

	instance, moreResults, err := operation.GetInstance()
	require.NoError(t, err)
	require.Empty(t, instance)
	require.False(t, moreResults)

	err = operation.Close()
	require.NoError(t, err)

	err = session.Close()
	require.NoError(t, err)

	err = application.Close()
	require.NoError(t, err)
}

func Test_MI_Query_Unmarshal(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	destinationOptions, err := application.NewDestinationOptions()
	require.NoError(t, err)
	require.NotEmpty(t, destinationOptions)

	err = destinationOptions.SetTimeout(1 * time.Second)
	require.NoError(t, err)

	err = destinationOptions.SetLocale(mi.LocaleEnglish)
	require.NoError(t, err)

	session, err := application.NewSession(destinationOptions)
	require.NoError(t, err)
	require.NotEmpty(t, session)

	operation, err := session.QueryInstances(mi.OperationFlagsStandardRTTI, nil, mi.NamespaceRootCIMv2, mi.QueryDialectWQL, "SELECT Name FROM Win32_Process WHERE Handle = 0 OR Handle = 4")

	require.NoError(t, err)
	require.NotEmpty(t, operation)

	var processes []win32Process

	err = operation.Unmarshal(&processes)
	require.NoError(t, err)
	require.Equal(t, []win32Process{{Name: "System Idle Process"}, {Name: "System"}}, processes)

	err = operation.Close()
	require.NoError(t, err)

	err = session.Close()
	require.NoError(t, err)

	err = application.Close()
	require.NoError(t, err)
}

func Test_MI_FD_Leak(t *testing.T) {
	application, err := mi.ApplicationInitialize()
	require.NoError(t, err)
	require.NotEmpty(t, application)

	session, err := application.NewSession(nil)
	require.NoError(t, err)
	require.NotEmpty(t, session)

	currentFileHandle, err := testutils.GetProcessHandleCount(windows.CurrentProcess())
	require.NoError(t, err)

	t.Log("Current File Handle Count: ", currentFileHandle)

	queryPrinter, err := mi.NewQuery("SELECT Name FROM Win32_Process")
	require.NoError(t, err)

	for range 300 {
		var processes []win32Process

		err := session.Query(&processes, mi.NamespaceRootCIMv2, queryPrinter)
		require.NoError(t, err)

		currentFileHandle, err = testutils.GetProcessHandleCount(windows.CurrentProcess())
		require.NoError(t, err)

		t.Log("Current File Handle Count: ", currentFileHandle)
	}

	currentFileHandle, err = testutils.GetProcessHandleCount(windows.CurrentProcess())
	require.NoError(t, err)

	t.Log("Current File Handle Count: ", currentFileHandle)

	err = session.Close()
	require.NoError(t, err)

	currentFileHandle, err = testutils.GetProcessHandleCount(windows.CurrentProcess())
	require.NoError(t, err)

	t.Log("Current File Handle Count: ", currentFileHandle)

	err = application.Close()
	require.NoError(t, err)

	currentFileHandle, err = testutils.GetProcessHandleCount(windows.CurrentProcess())
	require.NoError(t, err)

	t.Log("Current File Handle Count: ", currentFileHandle)
}