// 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 linux

package sysfs

import (
	"testing"

	"github.com/google/go-cmp/cmp"
)

func TestPciDevices(t *testing.T) {
	fs, err := NewFS(sysTestFixtures)
	if err != nil {
		t.Fatal(err)
	}

	got, err := fs.PciDevices()
	if err != nil {
		t.Fatal(err)
	}

	var (
		LinkSpeed8GTs  = 8.0
		LinkSpeed16GTs = 16.0
		LinkWidth4     = 4.0
		LinkWidth8     = 8.0

		// SR-IOV test values
		SriovDriversAutoprobe = true
		SriovNumvfs           = uint32(0)
		SriovOffset           = uint32(8)
		SriovStride           = uint32(1)
		SriovTotalvfs         = uint32(128)
		SriovVfDevice         = uint32(0x1889)
		SriovVfTotalMsix      = uint64(4294967033)

		// Optional device test values
		NumaNode      = int32(1)
		NumaNodeNeg1  = int32(-1)
		D3coldAllowed = true
		PowerState    = PciPowerStateD0
	)
	want := PciDevices{
		"0000:00:02:1": PciDevice{
			Location: PciDeviceLocation{
				Segment:  0,
				Bus:      0,
				Device:   2,
				Function: 1,
			},
			ParentLocation: nil,

			Class:           0x060400,
			Vendor:          0x1022,
			Device:          0x1634,
			SubsystemVendor: 0x17aa,
			SubsystemDevice: 0x5095,
			Revision:        0x00,
			NumaNode:        &NumaNodeNeg1,

			MaxLinkSpeed:     &LinkSpeed8GTs,
			MaxLinkWidth:     &LinkWidth8,
			CurrentLinkSpeed: &LinkSpeed8GTs,
			CurrentLinkWidth: &LinkWidth4,

			D3coldAllowed: &D3coldAllowed,
			PowerState:    &PowerState,
		},
		"0000:01:00:0": PciDevice{
			Location: PciDeviceLocation{
				Segment:  0,
				Bus:      1,
				Device:   0,
				Function: 0,
			},
			ParentLocation: &PciDeviceLocation{
				Segment:  0,
				Bus:      0,
				Device:   2,
				Function: 1,
			},

			Class:           0x010802,
			Vendor:          0xc0a9,
			Device:          0x540a,
			SubsystemVendor: 0xc0a9,
			SubsystemDevice: 0x5021,
			Revision:        0x01,
			NumaNode:        &NumaNodeNeg1,

			MaxLinkSpeed:     &LinkSpeed8GTs,
			MaxLinkWidth:     &LinkWidth4,
			CurrentLinkSpeed: &LinkSpeed8GTs,
			CurrentLinkWidth: &LinkWidth4,

			D3coldAllowed: &D3coldAllowed,
			PowerState:    &PowerState,
		},
		"0000:a2:00:0": PciDevice{
			Location: PciDeviceLocation{
				Segment:  0,
				Bus:      0xa2,
				Device:   0,
				Function: 0,
			},
			ParentLocation: nil,

			Class:           0x020000,
			Vendor:          0x8086,
			Device:          0x159b,
			SubsystemVendor: 0x8086,
			SubsystemDevice: 0x0003,
			Revision:        0x02,
			NumaNode:        &NumaNode,

			MaxLinkSpeed:     &LinkSpeed16GTs,
			MaxLinkWidth:     &LinkWidth8,
			CurrentLinkSpeed: &LinkSpeed16GTs,
			CurrentLinkWidth: &LinkWidth8,

			// SR-IOV fields
			SriovDriversAutoprobe: &SriovDriversAutoprobe,
			SriovNumvfs:           &SriovNumvfs,
			SriovOffset:           &SriovOffset,
			SriovStride:           &SriovStride,
			SriovTotalvfs:         &SriovTotalvfs,
			SriovVfDevice:         &SriovVfDevice,
			SriovVfTotalMsix:      &SriovVfTotalMsix,

			// Power management fields
			D3coldAllowed: &D3coldAllowed,
			PowerState:    &PowerState,
		},
	}

	if diff := cmp.Diff(want, got); diff != "" {
		t.Fatalf("unexpected PciDevices (-want +got):\n%s", diff)
	}
}

func TestParseDeviceLocation(t *testing.T) {
	got, err := parsePciDeviceLocation("0001:9b:0c.0")
	if err != nil {
		t.Fatal(err)
	}

	want := &PciDeviceLocation{
		Segment:  1,
		Bus:      0x9b,
		Device:   0xc,
		Function: 0,
	}

	if diff := cmp.Diff(want, got); diff != "" {
		t.Fatalf("unexpected location (-want +got):\n%s", diff)
	}
}