/**
# Copyright (c) 2025, NVIDIA CORPORATION.  All rights reserved.
#
# 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 generate

import (
	"bytes"
	"path/filepath"
	"strings"
	"testing"

	"github.com/NVIDIA/go-nvml/pkg/nvml"
	"github.com/NVIDIA/go-nvml/pkg/nvml/mock/dgxa100"
	testlog "github.com/sirupsen/logrus/hooks/test"
	"github.com/stretchr/testify/require"

	"github.com/NVIDIA/nvidia-container-toolkit/internal/test"
)

func TestGenerateSpec(t *testing.T) {
	t.Setenv("__NVCT_TESTING_DEVICES_ARE_FILES", "true")
	moduleRoot, err := test.GetModuleRoot()
	require.NoError(t, err)

	driverRoot := filepath.Join(moduleRoot, "testdata", "lookup", "rootfs-1")

	logger, _ := testlog.NewNullLogger()
	testCases := []struct {
		description           string
		options               options
		expectedValidateError error
		expectedOptions       options
		expectedError         error
		expectedSpec          string
	}{
		{
			description: "default",
			options: options{
				format:     "yaml",
				mode:       "nvml",
				vendor:     "example.com",
				class:      "device",
				driverRoot: driverRoot,
			},
			expectedOptions: options{
				format:            "yaml",
				mode:              "nvml",
				vendor:            "example.com",
				class:             "device",
				nvidiaCDIHookPath: "/usr/bin/nvidia-cdi-hook",
				driverRoot:        driverRoot,
			},
			expectedSpec: `---
cdiVersion: 0.5.0
containerEdits:
  deviceNodes:
  - hostPath: {{ .driverRoot }}/dev/nvidiactl
    path: /dev/nvidiactl
  env:
  - NVIDIA_VISIBLE_DEVICES=void
  hooks:
  - args:
    - nvidia-cdi-hook
    - create-symlinks
    - --link
    - libcuda.so.1::/lib/x86_64-linux-gnu/libcuda.so
    hookName: createContainer
    path: /usr/bin/nvidia-cdi-hook
  - args:
    - nvidia-cdi-hook
    - enable-cuda-compat
    - --host-driver-version=999.88.77
    hookName: createContainer
    path: /usr/bin/nvidia-cdi-hook
  - args:
    - nvidia-cdi-hook
    - create-soname-symlinks
    - --folder
    - /lib/x86_64-linux-gnu
    hookName: createContainer
    path: /usr/bin/nvidia-cdi-hook
  - args:
    - nvidia-cdi-hook
    - update-ldcache
    - --folder
    - /lib/x86_64-linux-gnu
    hookName: createContainer
    path: /usr/bin/nvidia-cdi-hook
  mounts:
  - containerPath: /lib/x86_64-linux-gnu/libcuda.so.999.88.77
    hostPath: {{ .driverRoot }}/lib/x86_64-linux-gnu/libcuda.so.999.88.77
    options:
    - ro
    - nosuid
    - nodev
    - bind
devices:
- containerEdits:
    deviceNodes:
    - hostPath: {{ .driverRoot }}/dev/nvidia0
      path: /dev/nvidia0
  name: "0"
- containerEdits:
    deviceNodes:
    - hostPath: {{ .driverRoot }}/dev/nvidia0
      path: /dev/nvidia0
  name: all
kind: example.com/device
`,
		},
	}

	for _, tc := range testCases {
		t.Run(tc.description, func(t *testing.T) {
			c := command{
				logger: logger,
			}

			err := c.validateFlags(nil, &tc.options)
			require.ErrorIs(t, err, tc.expectedValidateError)
			require.EqualValues(t, tc.expectedOptions, tc.options)

			// Set up a mock server, reusing the DGX A100 mock.
			server := dgxa100.New()
			// Override the driver version to match the version in our mock filesystem.
			server.SystemGetDriverVersionFunc = func() (string, nvml.Return) {
				return "999.88.77", nvml.SUCCESS
			}
			// Set the device count to 1 explicitly since we only have a single device node.
			server.DeviceGetCountFunc = func() (int, nvml.Return) {
				return 1, nvml.SUCCESS
			}
			for _, d := range server.Devices {
				// TODO: This is not implemented in the mock.
				(d.(*dgxa100.Device)).GetMaxMigDeviceCountFunc = func() (int, nvml.Return) {
					return 0, nvml.SUCCESS
				}
			}
			tc.options.nvmllib = server

			spec, err := c.generateSpec(&tc.options)
			require.ErrorIs(t, err, tc.expectedError)

			var buf bytes.Buffer
			_, err = spec.WriteTo(&buf)
			require.NoError(t, err)

			require.Equal(t, strings.ReplaceAll(tc.expectedSpec, "{{ .driverRoot }}", driverRoot), buf.String())
		})
	}
}