package platform

import (
	"context"
	"errors"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func TestStorageSATCommands(t *testing.T) {
	t.Parallel()

	nvme := storageSATCommands("/dev/nvme0n1", false)
	if len(nvme) != 3 || nvme[2].cmd[0] != "nvme" {
		t.Fatalf("unexpected nvme commands: %#v", nvme)
	}

	sata := storageSATCommands("/dev/sda", false)
	if len(sata) != 2 || sata[0].cmd[0] != "smartctl" {
		t.Fatalf("unexpected sata commands: %#v", sata)
	}
}

func TestRunNvidiaAcceptancePackIncludesGPUStress(t *testing.T) {
	t.Parallel()

	jobs := nvidiaSATJobs()

	if len(jobs) != 6 {
		t.Fatalf("jobs=%d want 6", len(jobs))
	}
	if got := jobs[0].cmd[0]; got != "nvidia-smi" {
		t.Fatalf("preflight command=%q want nvidia-smi", got)
	}
	if got := strings.Join(jobs[0].cmd, " "); got != "nvidia-smi -pm 1" {
		t.Fatalf("preflight=%q want %q", got, "nvidia-smi -pm 1")
	}
	if got := jobs[5].cmd[0]; got != "bee-gpu-burn" {
		t.Fatalf("gpu stress command=%q want bee-gpu-burn", got)
	}
	if got := jobs[4].cmd[1]; got != "--output-file" {
		t.Fatalf("bug report flag=%q want --output-file", got)
	}
}

func TestAMDStressConfigUsesSingleGSTAction(t *testing.T) {
	t.Parallel()

	cfg := amdStressRVSConfig(123)
	if !strings.Contains(cfg, "module: gst") {
		t.Fatalf("config missing gst module:\n%s", cfg)
	}
	if strings.Contains(cfg, "module: mem") {
		t.Fatalf("config should not include mem module:\n%s", cfg)
	}
	if !strings.Contains(cfg, "copy_matrix: false") {
		t.Fatalf("config should use copy_matrix=false:\n%s", cfg)
	}
	if strings.Count(cfg, "duration: 123000") != 1 {
		t.Fatalf("config should apply duration once:\n%s", cfg)
	}
	for _, field := range []string{"matrix_size_a: 8640", "matrix_size_b: 8640", "matrix_size_c: 8640"} {
		if !strings.Contains(cfg, field) {
			t.Fatalf("config missing %s:\n%s", field, cfg)
		}
	}
}

func TestAMDStressJobsIncludeBandwidthAndGST(t *testing.T) {
	t.Parallel()

	jobs := amdStressJobs(300, "/tmp/test-amd-gst.conf")
	if len(jobs) != 4 {
		t.Fatalf("jobs=%d want 4", len(jobs))
	}
	if got := jobs[1].cmd[0]; got != "rocm-bandwidth-test" {
		t.Fatalf("jobs[1]=%q want rocm-bandwidth-test", got)
	}
	if got := jobs[2].cmd[0]; got != "rvs" {
		t.Fatalf("jobs[2]=%q want rvs", got)
	}
	if got := jobs[2].cmd[2]; got != "/tmp/test-amd-gst.conf" {
		t.Fatalf("jobs[2] cfg=%q want /tmp/test-amd-gst.conf", got)
	}
}

func TestNvidiaSATJobsUseBuiltinBurnDefaults(t *testing.T) {
	jobs := nvidiaSATJobs()
	got := jobs[5].cmd
	want := []string{"bee-gpu-burn", "--seconds", "5", "--size-mb", "64"}
	if len(got) != len(want) {
		t.Fatalf("cmd len=%d want %d", len(got), len(want))
	}
	for i := range want {
		if got[i] != want[i] {
			t.Fatalf("cmd[%d]=%q want %q", i, got[i], want[i])
		}
	}
}

func TestNvidiaDCGMJobsEnablePersistenceModeBeforeDiag(t *testing.T) {
	jobs := nvidiaDCGMJobs(3, []int{2, 0})
	if len(jobs) != 5 {
		t.Fatalf("jobs=%d want 5", len(jobs))
	}
	if got := strings.Join(jobs[0].cmd, " "); got != "nvidia-smi -pm 1" {
		t.Fatalf("preflight=%q want %q", got, "nvidia-smi -pm 1")
	}
	if got := strings.Join(jobs[4].cmd, " "); got != "dcgmi diag -r 3 -i 2,0" {
		t.Fatalf("diag=%q want %q", got, "dcgmi diag -r 3 -i 2,0")
	}
}

func TestBuildNvidiaStressJobUsesSelectedLoaderAndDevices(t *testing.T) {
	t.Parallel()

	oldExecCommand := satExecCommand
	satExecCommand = func(name string, args ...string) *exec.Cmd {
		if name == "nvidia-smi" {
			return exec.Command("sh", "-c", "printf '0\n1\n2\n'")
		}
		return exec.Command(name, args...)
	}
	t.Cleanup(func() { satExecCommand = oldExecCommand })

	job, err := buildNvidiaStressJob(NvidiaStressOptions{
		DurationSec:       600,
		Loader:            NvidiaStressLoaderJohn,
		ExcludeGPUIndices: []int{1},
	})
	if err != nil {
		t.Fatalf("buildNvidiaStressJob error: %v", err)
	}
	wantCmd := []string{"bee-john-gpu-stress", "--seconds", "600", "--devices", "0,2"}
	if len(job.cmd) != len(wantCmd) {
		t.Fatalf("cmd len=%d want %d (%v)", len(job.cmd), len(wantCmd), job.cmd)
	}
	for i := range wantCmd {
		if job.cmd[i] != wantCmd[i] {
			t.Fatalf("cmd[%d]=%q want %q", i, job.cmd[i], wantCmd[i])
		}
	}
	if got := joinIndexList(job.gpuIndices); got != "0,2" {
		t.Fatalf("gpuIndices=%q want 0,2", got)
	}
}

func TestBuildNvidiaStressJobUsesNCCLLoader(t *testing.T) {
	t.Parallel()

	oldExecCommand := satExecCommand
	satExecCommand = func(name string, args ...string) *exec.Cmd {
		if name == "nvidia-smi" {
			return exec.Command("sh", "-c", "printf '0\n1\n2\n'")
		}
		return exec.Command(name, args...)
	}
	t.Cleanup(func() { satExecCommand = oldExecCommand })

	job, err := buildNvidiaStressJob(NvidiaStressOptions{
		DurationSec: 120,
		Loader:      NvidiaStressLoaderNCCL,
		GPUIndices:  []int{2, 0},
	})
	if err != nil {
		t.Fatalf("buildNvidiaStressJob error: %v", err)
	}
	wantCmd := []string{"bee-nccl-gpu-stress", "--seconds", "120", "--devices", "0,2"}
	if len(job.cmd) != len(wantCmd) {
		t.Fatalf("cmd len=%d want %d (%v)", len(job.cmd), len(wantCmd), job.cmd)
	}
	for i := range wantCmd {
		if job.cmd[i] != wantCmd[i] {
			t.Fatalf("cmd[%d]=%q want %q", i, job.cmd[i], wantCmd[i])
		}
	}
	if got := joinIndexList(job.gpuIndices); got != "0,2" {
		t.Fatalf("gpuIndices=%q want 0,2", got)
	}
}

func TestResolveDCGMGPUIndicesUsesDetectedGPUsWhenUnset(t *testing.T) {
	t.Parallel()

	oldExecCommand := satExecCommand
	satExecCommand = func(name string, args ...string) *exec.Cmd {
		if name == "nvidia-smi" {
			return exec.Command("sh", "-c", "printf '2\n0\n1\n'")
		}
		return exec.Command(name, args...)
	}
	t.Cleanup(func() { satExecCommand = oldExecCommand })

	got, err := resolveDCGMGPUIndices(nil)
	if err != nil {
		t.Fatalf("resolveDCGMGPUIndices error: %v", err)
	}
	if want := "0,1,2"; joinIndexList(got) != want {
		t.Fatalf("gpuIndices=%q want %q", joinIndexList(got), want)
	}
}

func TestResolveDCGMGPUIndicesKeepsExplicitSelection(t *testing.T) {
	t.Parallel()

	got, err := resolveDCGMGPUIndices([]int{3, 1, 3})
	if err != nil {
		t.Fatalf("resolveDCGMGPUIndices error: %v", err)
	}
	if want := "1,3"; joinIndexList(got) != want {
		t.Fatalf("gpuIndices=%q want %q", joinIndexList(got), want)
	}
}

func TestParseNvidiaGPUHealthDetectsResetRequired(t *testing.T) {
	t.Parallel()

	got := parseNvidiaGPUHealth("0, NVIDIA H100 PCIe, 38, 46.89, 0, 0, 81559\n1, NVIDIA H100 PCIe, [GPU requires reset], [N/A], [N/A], 0, 81559\n")
	if len(got) != 2 {
		t.Fatalf("len=%d want 2", len(got))
	}
	if got[0].NeedsReset {
		t.Fatalf("gpu0 unexpectedly marked reset-required")
	}
	if !got[1].NeedsReset {
		t.Fatalf("gpu1 should be marked reset-required: %#v", got[1])
	}
}

func TestCheckNvidiaJobHealthReturnsErrorForSelectedResetRequiredGPU(t *testing.T) {
	oldExecCommand := satExecCommand
	satExecCommand = func(name string, args ...string) *exec.Cmd {
		if name == "nvidia-smi" {
			return exec.Command("sh", "-c", "printf '0, NVIDIA H100 PCIe, 38, 46.89, 0, 0, 81559\n1, NVIDIA H100 PCIe, [GPU requires reset], [N/A], [N/A], 0, 81559\n'")
		}
		return exec.Command(name, args...)
	}
	t.Cleanup(func() { satExecCommand = oldExecCommand })

	msg, err := checkNvidiaJobHealth([]int{1})
	if err == nil {
		t.Fatal("expected health check error")
	}
	if !strings.Contains(msg, "gpu 1") || !strings.Contains(strings.ToLower(msg), "requires reset") {
		t.Fatalf("unexpected message: %q", msg)
	}
}

func TestWriteNvidiaGPUStatusFilesCreatesPerGPUFiles(t *testing.T) {
	dir := t.TempDir()
	oldExecCommand := satExecCommand
	satExecCommand = func(name string, args ...string) *exec.Cmd {
		if name == "nvidia-smi" {
			return exec.Command("sh", "-c", "printf '0, NVIDIA H100 PCIe, 38, 46.89, 0, 0, 81559\n1, NVIDIA H100 PCIe, [GPU requires reset], [N/A], [N/A], 0, 81559\n'")
		}
		return exec.Command(name, args...)
	}
	t.Cleanup(func() { satExecCommand = oldExecCommand })

	perGPU := map[int]*nvidiaGPUStatusFile{
		0: {Index: 0, RunStatus: "OK"},
		1: {Index: 1, RunStatus: "FAILED", FailingJob: "02-dcgmi-targeted-stress.log", Reason: "NVIDIA GPU health check failed:"},
	}
	if err := writeNvidiaGPUStatusFiles(dir, "FAILED", perGPU, map[int]struct{}{0: {}, 1: {}}); err != nil {
		t.Fatalf("writeNvidiaGPUStatusFiles error: %v", err)
	}
	raw, err := os.ReadFile(filepath.Join(dir, "gpu-1-status.txt"))
	if err != nil {
		t.Fatalf("ReadFile gpu-1-status.txt: %v", err)
	}
	text := string(raw)
	if !strings.Contains(text, "run_status=FAILED") {
		t.Fatalf("missing run status:\n%s", text)
	}
	if !strings.Contains(text, "health_status=RESET_REQUIRED") {
		t.Fatalf("missing health status:\n%s", text)
	}
	if !strings.Contains(text, "failing_job=02-dcgmi-targeted-stress.log") {
		t.Fatalf("missing failing job:\n%s", text)
	}
}

func TestResolveDCGMProfTesterCommandUsesVersionedBinary(t *testing.T) {
	oldLookPath := satLookPath
	satLookPath = func(file string) (string, error) {
		switch file {
		case "dcgmproftester13":
			return "/usr/bin/dcgmproftester13", nil
		default:
			return "", exec.ErrNotFound
		}
	}
	t.Cleanup(func() { satLookPath = oldLookPath })

	cmd, err := resolveDCGMProfTesterCommand("--no-dcgm-validation", "-t", "1004")
	if err != nil {
		t.Fatalf("resolveDCGMProfTesterCommand error: %v", err)
	}
	if len(cmd) != 4 {
		t.Fatalf("cmd len=%d want 4 (%v)", len(cmd), cmd)
	}
	if cmd[0] != "/usr/bin/dcgmproftester13" {
		t.Fatalf("cmd[0]=%q want /usr/bin/dcgmproftester13", cmd[0])
	}
}

func TestNvidiaDCGMNamedDiagCommandUsesDurationAndSelection(t *testing.T) {
	cmd := nvidiaDCGMNamedDiagCommand("targeted_power", 900, []int{3, 1})
	want := []string{"dcgmi", "diag", "-r", "targeted_power", "-p", "targeted_power.test_duration=900", "-i", "3,1"}
	if len(cmd) != len(want) {
		t.Fatalf("cmd len=%d want %d (%v)", len(cmd), len(want), cmd)
	}
	for i := range want {
		if cmd[i] != want[i] {
			t.Fatalf("cmd[%d]=%q want %q", i, cmd[i], want[i])
		}
	}
}

func TestNvidiaVisibleDevicesEnvUsesSelectedGPUs(t *testing.T) {
	env := nvidiaVisibleDevicesEnv([]int{0, 2, 4})
	if len(env) != 2 {
		t.Fatalf("env len=%d want 2 (%v)", len(env), env)
	}
	if env[0] != "CUDA_DEVICE_ORDER=PCI_BUS_ID" {
		t.Fatalf("env[0]=%q want CUDA_DEVICE_ORDER=PCI_BUS_ID", env[0])
	}
	if env[1] != "CUDA_VISIBLE_DEVICES=0,2,4" {
		t.Fatalf("env[1]=%q want CUDA_VISIBLE_DEVICES=0,2,4", env[1])
	}
}

func TestNvidiaStressArchivePrefixByLoader(t *testing.T) {
	t.Parallel()

	tests := []struct {
		loader string
		want   string
	}{
		{loader: NvidiaStressLoaderBuiltin, want: "gpu-nvidia-burn"},
		{loader: NvidiaStressLoaderJohn, want: "gpu-nvidia-john"},
		{loader: NvidiaStressLoaderNCCL, want: "gpu-nvidia-nccl"},
		{loader: "", want: "gpu-nvidia-burn"},
	}
	for _, tt := range tests {
		if got := nvidiaStressArchivePrefix(tt.loader); got != tt.want {
			t.Fatalf("loader=%q prefix=%q want %q", tt.loader, got, tt.want)
		}
	}
}

func TestEnvIntFallback(t *testing.T) {
	os.Unsetenv("BEE_MEMTESTER_SIZE_MB")
	if got := envInt("BEE_MEMTESTER_SIZE_MB", 123); got != 123 {
		t.Fatalf("got %d want 123", got)
	}
	t.Setenv("BEE_MEMTESTER_SIZE_MB", "bad")
	if got := envInt("BEE_MEMTESTER_SIZE_MB", 123); got != 123 {
		t.Fatalf("got %d want 123", got)
	}
	t.Setenv("BEE_MEMTESTER_SIZE_MB", "256")
	if got := envInt("BEE_MEMTESTER_SIZE_MB", 123); got != 256 {
		t.Fatalf("got %d want 256", got)
	}
}

func TestMemoryStressSizeArgUsesAvailableMemory(t *testing.T) {
	oldFreeMemBytes := satFreeMemBytes
	satFreeMemBytes = func() int64 { return 96 * 1024 * 1024 * 1024 }
	t.Cleanup(func() { satFreeMemBytes = oldFreeMemBytes })

	if got := memoryStressSizeArg(); got != "65536M" {
		t.Fatalf("sizeArg=%q want 65536M", got)
	}
}

func TestMemoryStressSizeArgRespectsOverride(t *testing.T) {
	oldFreeMemBytes := satFreeMemBytes
	satFreeMemBytes = func() int64 { return 96 * 1024 * 1024 * 1024 }
	t.Cleanup(func() { satFreeMemBytes = oldFreeMemBytes })
	t.Setenv("BEE_VM_STRESS_SIZE_MB", "4096")

	if got := memoryStressSizeArg(); got != "4096M" {
		t.Fatalf("sizeArg=%q want 4096M", got)
	}
}

func TestMemoryStressSizeArgFallsBackWhenFreeMemoryUnknown(t *testing.T) {
	oldFreeMemBytes := satFreeMemBytes
	satFreeMemBytes = func() int64 { return 0 }
	t.Cleanup(func() { satFreeMemBytes = oldFreeMemBytes })

	if got := memoryStressSizeArg(); got != "80%" {
		t.Fatalf("sizeArg=%q want 80%%", got)
	}
}

func TestClassifySATResult(t *testing.T) {
	tests := []struct {
		name   string
		job    string
		out    string
		err    error
		status string
	}{
		{name: "ok", job: "memtester", out: "done", err: nil, status: "OK"},
		{name: "unsupported", job: "smartctl-self-test-short", out: "Self-test not supported", err: errors.New("rc 1"), status: "UNSUPPORTED"},
		{name: "nvme wait timeout without progress", job: "nvme-device-self-test", out: "Short Device self-test started\nWaiting for self test completion...\nno progress for 78 seconds, stop waiting", err: errors.New("rc 1"), status: "UNSUPPORTED"},
		{name: "failed", job: "bee-gpu-burn", out: "cuda error", err: errors.New("rc 1"), status: "FAILED"},
		{name: "cuda not ready", job: "bee-gpu-burn", out: "cuInit failed: CUDA_ERROR_SYSTEM_NOT_READY", err: errors.New("rc 1"), status: "UNSUPPORTED"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, _ := classifySATResult(tt.job, []byte(tt.out), tt.err)
			if got != tt.status {
				t.Fatalf("status=%q want %q", got, tt.status)
			}
		})
	}
}

func TestRunAcceptancePackCtxReturnsContextErrorWithoutArchive(t *testing.T) {
	dir := t.TempDir()
	ctx, cancel := context.WithCancel(context.Background())
	t.Cleanup(cancel)

	done := make(chan struct{})
	go func() {
		time.Sleep(100 * time.Millisecond)
		cancel()
		close(done)
	}()

	archive, err := runAcceptancePackCtx(ctx, dir, "cancelled-pack", []satJob{
		{name: "01-sleep.log", cmd: []string{"sh", "-c", "sleep 5"}},
	}, nil)
	<-done

	if !errors.Is(err, context.Canceled) {
		t.Fatalf("err=%v want context.Canceled", err)
	}
	if archive != "" {
		t.Fatalf("archive=%q want empty", archive)
	}
	matches, globErr := filepath.Glob(filepath.Join(dir, "cancelled-pack-*.tar.gz"))
	if globErr != nil {
		t.Fatalf("Glob error: %v", globErr)
	}
	if len(matches) != 0 {
		t.Fatalf("archives=%v want none", matches)
	}
}

func TestParseStorageDevicesSkipsUSBDisks(t *testing.T) {
	t.Parallel()

	raw := "nvme0n1 disk nvme\nsda disk usb\nloop0 loop\nsdb disk sata\n"
	got := parseStorageDevices(raw)
	want := []string{"/dev/nvme0n1", "/dev/sdb"}
	if len(got) != len(want) {
		t.Fatalf("len(devices)=%d want %d (%v)", len(got), len(want), got)
	}
	for i := range want {
		if got[i] != want[i] {
			t.Fatalf("devices[%d]=%q want %q", i, got[i], want[i])
		}
	}
}

func TestResolveROCmSMICommandFromPATH(t *testing.T) {
	t.Setenv("PATH", t.TempDir())

	toolPath := filepath.Join(os.Getenv("PATH"), "rocm-smi")
	if err := os.WriteFile(toolPath, []byte("#!/bin/sh\nexit 0\n"), 0755); err != nil {
		t.Fatalf("write rocm-smi: %v", err)
	}

	cmd, err := resolveROCmSMICommand("--showproductname")
	if err != nil {
		t.Fatalf("resolveROCmSMICommand error: %v", err)
	}
	if len(cmd) != 2 {
		t.Fatalf("cmd len=%d want 2 (%v)", len(cmd), cmd)
	}
	if cmd[0] != toolPath {
		t.Fatalf("cmd[0]=%q want %q", cmd[0], toolPath)
	}
}

func TestResolveSATCommandUsesLookPathForGenericTools(t *testing.T) {
	oldLookPath := satLookPath
	satLookPath = func(file string) (string, error) {
		if file == "stress-ng" {
			return "/usr/bin/stress-ng", nil
		}
		return "", exec.ErrNotFound
	}
	t.Cleanup(func() { satLookPath = oldLookPath })

	cmd, err := resolveSATCommand([]string{"stress-ng", "--cpu", "0"})
	if err != nil {
		t.Fatalf("resolveSATCommand error: %v", err)
	}
	if len(cmd) != 3 {
		t.Fatalf("cmd len=%d want 3 (%v)", len(cmd), cmd)
	}
	if cmd[0] != "/usr/bin/stress-ng" {
		t.Fatalf("cmd[0]=%q want /usr/bin/stress-ng", cmd[0])
	}
}

func TestResolveSATCommandFailsForMissingGenericTool(t *testing.T) {
	oldLookPath := satLookPath
	satLookPath = func(file string) (string, error) {
		return "", exec.ErrNotFound
	}
	t.Cleanup(func() { satLookPath = oldLookPath })

	_, err := resolveSATCommand([]string{"stress-ng", "--cpu", "0"})
	if err == nil {
		t.Fatal("expected error")
	}
	if !strings.Contains(err.Error(), "stress-ng not found in PATH") {
		t.Fatalf("error=%q", err)
	}
}

func TestResolveROCmSMICommandFallsBackToROCmTree(t *testing.T) {
	tmp := t.TempDir()
	execPath := filepath.Join(tmp, "opt", "rocm", "bin", "rocm-smi")
	if err := os.MkdirAll(filepath.Dir(execPath), 0755); err != nil {
		t.Fatalf("mkdir: %v", err)
	}
	if err := os.WriteFile(execPath, []byte("#!/bin/sh\nexit 0\n"), 0755); err != nil {
		t.Fatalf("write rocm-smi: %v", err)
	}

	oldGlob := rocmSMIExecutableGlobs
	oldScriptGlobs := rocmSMIScriptGlobs
	rocmSMIExecutableGlobs = []string{execPath}
	rocmSMIScriptGlobs = nil
	t.Cleanup(func() {
		rocmSMIExecutableGlobs = oldGlob
		rocmSMIScriptGlobs = oldScriptGlobs
	})

	t.Setenv("PATH", "")

	cmd, err := resolveROCmSMICommand("--showallinfo")
	if err != nil {
		t.Fatalf("resolveROCmSMICommand error: %v", err)
	}
	if len(cmd) != 2 {
		t.Fatalf("cmd len=%d want 2 (%v)", len(cmd), cmd)
	}
	if cmd[0] != execPath {
		t.Fatalf("cmd[0]=%q want %q", cmd[0], execPath)
	}
}

func TestRunROCmSMIReportsMissingCommand(t *testing.T) {
	oldLookPath := satLookPath
	oldExecGlobs := rocmSMIExecutableGlobs
	oldScriptGlobs := rocmSMIScriptGlobs
	satLookPath = func(string) (string, error) { return "", exec.ErrNotFound }
	rocmSMIExecutableGlobs = nil
	rocmSMIScriptGlobs = nil
	t.Cleanup(func() {
		satLookPath = oldLookPath
		rocmSMIExecutableGlobs = oldExecGlobs
		rocmSMIScriptGlobs = oldScriptGlobs
	})

	if _, err := runROCmSMI("--showproductname"); err == nil {
		t.Fatal("expected missing rocm-smi error")
	}
}