package cmd

import (
	"io"
	"io/ioutil"
	"strings"
	"testing"

	"github.com/SAP/jenkins-library/pkg/config"
	"github.com/spf13/cobra"
	flag "github.com/spf13/pflag"
	"github.com/stretchr/testify/assert"
)

type execMockRunner struct {
	dir            []string
	calls          []execCall
	stdout         io.Writer
	stderr         io.Writer
	shouldFailWith error
}

type execCall struct {
	exec   string
	params []string
}

type shellMockRunner struct {
	dir            string
	calls          []string
	stdout         io.Writer
	stderr         io.Writer
	shouldFailWith error
}

func (m *execMockRunner) Dir(d string) {
	m.dir = append(m.dir, d)
}

func (m *execMockRunner) RunExecutable(e string, p ...string) error {
	if m.shouldFailWith != nil {
		return m.shouldFailWith
	}
	exec := execCall{exec: e, params: p}
	m.calls = append(m.calls, exec)
	return nil
}

func (m *execMockRunner) Stdout(out io.Writer) {
	m.stdout = out
}

func (m *execMockRunner) Stderr(err io.Writer) {
	m.stderr = err
}

func (m *shellMockRunner) Dir(d string) {
	m.dir = d
}

func (m *shellMockRunner) RunShell(s string, c string) error {

	if m.shouldFailWith != nil {
		return m.shouldFailWith
	}

	m.calls = append(m.calls, c)
	return nil
}

func (m *shellMockRunner) Stdout(out io.Writer) {
	m.stdout = out
}

func (m *shellMockRunner) Stderr(err io.Writer) {
	m.stderr = err
}

type stepOptions struct {
	TestParam string `json:"testParam,omitempty"`
}

func openFileMock(name string) (io.ReadCloser, error) {
	var r string
	switch name {
	case "testDefaults.yml":
		r = "general:\n  testParam: testValue"
	case "testDefaultsInvalid.yml":
		r = "invalid yaml"
	default:
		r = ""
	}
	return ioutil.NopCloser(strings.NewReader(r)), nil
}

func TestAddRootFlags(t *testing.T) {
	var testRootCmd = &cobra.Command{Use: "test", Short: "This is just a test"}
	addRootFlags(testRootCmd)

	assert.NotNil(t, testRootCmd.Flag("customConfig"), "expected flag not available")
	assert.NotNil(t, testRootCmd.Flag("defaultConfig"), "expected flag not available")
	assert.NotNil(t, testRootCmd.Flag("parametersJSON"), "expected flag not available")
	assert.NotNil(t, testRootCmd.Flag("stageName"), "expected flag not available")
	assert.NotNil(t, testRootCmd.Flag("stepConfigJSON"), "expected flag not available")
	assert.NotNil(t, testRootCmd.Flag("verbose"), "expected flag not available")

}

func TestPrepareConfig(t *testing.T) {
	defaultsBak := GeneralConfig.DefaultConfig
	GeneralConfig.DefaultConfig = []string{"testDefaults.yml"}
	defer func() { GeneralConfig.DefaultConfig = defaultsBak }()

	t.Run("using stepConfigJSON", func(t *testing.T) {
		stepConfigJSONBak := GeneralConfig.StepConfigJSON
		GeneralConfig.StepConfigJSON = `{"testParam": "testValueJSON"}`
		defer func() { GeneralConfig.StepConfigJSON = stepConfigJSONBak }()
		testOptions := stepOptions{}
		var testCmd = &cobra.Command{Use: "test", Short: "This is just a test"}
		testCmd.Flags().StringVar(&testOptions.TestParam, "testParam", "", "test usage")
		metadata := config.StepData{
			Spec: config.StepSpec{
				Inputs: config.StepInputs{
					Parameters: []config.StepParameters{
						{Name: "testParam", Scope: []string{"GENERAL"}},
					},
				},
			},
		}

		PrepareConfig(testCmd, &metadata, "testStep", &testOptions, openFileMock)
		assert.Equal(t, "testValueJSON", testOptions.TestParam, "wrong value retrieved from config")
	})

	t.Run("using config files", func(t *testing.T) {
		t.Run("success case", func(t *testing.T) {
			testOptions := stepOptions{}
			var testCmd = &cobra.Command{Use: "test", Short: "This is just a test"}
			testCmd.Flags().StringVar(&testOptions.TestParam, "testParam", "", "test usage")
			metadata := config.StepData{
				Spec: config.StepSpec{
					Inputs: config.StepInputs{
						Parameters: []config.StepParameters{
							{Name: "testParam", Scope: []string{"GENERAL"}},
						},
					},
				},
			}

			err := PrepareConfig(testCmd, &metadata, "testStep", &testOptions, openFileMock)
			assert.NoError(t, err, "no error expected but error occured")

			//assert config
			assert.Equal(t, "testValue", testOptions.TestParam, "wrong value retrieved from config")

			//assert that flag has been marked as changed
			testCmd.Flags().VisitAll(func(pflag *flag.Flag) {
				if pflag.Name == "testParam" {
					assert.True(t, pflag.Changed, "flag should be marked as changed")
				}
			})
		})

		t.Run("error case", func(t *testing.T) {
			GeneralConfig.DefaultConfig = []string{"testDefaultsInvalid.yml"}
			testOptions := stepOptions{}
			var testCmd = &cobra.Command{Use: "test", Short: "This is just a test"}
			metadata := config.StepData{}

			err := PrepareConfig(testCmd, &metadata, "testStep", &testOptions, openFileMock)
			assert.Error(t, err, "error expected but none occured")
		})
	})
}