package provider

import (
	"io/ioutil"
	"os"
	"strings"
	"testing"
	"text/template"

	"github.com/containous/traefik/types"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

type myProvider struct {
	BaseProvider
	TLS *types.ClientTLS
}

func (p *myProvider) Foo() string {
	return "bar"
}

func TestConfigurationErrors(t *testing.T) {
	templateErrorFile, err := ioutil.TempFile("", "provider-configuration-error")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(templateErrorFile.Name())
	data := []byte("Not a valid template {{ Bar }}")
	err = ioutil.WriteFile(templateErrorFile.Name(), data, 0700)
	if err != nil {
		t.Fatal(err)
	}

	templateInvalidTOMLFile, err := ioutil.TempFile("", "provider-configuration-error")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(templateInvalidTOMLFile.Name())
	data = []byte(`Hello {{ .Name }}
{{ Foo }}`)
	err = ioutil.WriteFile(templateInvalidTOMLFile.Name(), data, 0700)
	if err != nil {
		t.Fatal(err)
	}

	invalids := []struct {
		provider        *myProvider
		defaultTemplate string
		expectedError   string
		funcMap         template.FuncMap
		templateObjects interface{}
	}{
		{
			provider: &myProvider{
				BaseProvider{
					Filename: "/non/existent/template.tmpl",
				},
				nil,
			},
			expectedError: "open /non/existent/template.tmpl: no such file or directory",
		},
		{
			provider:        &myProvider{},
			defaultTemplate: "non/existent/template.tmpl",
			expectedError:   "Asset non/existent/template.tmpl not found",
		},
		{
			provider: &myProvider{
				BaseProvider{
					Filename: templateErrorFile.Name(),
				},
				nil,
			},
			expectedError: `function "Bar" not defined`,
		},
		{
			provider: &myProvider{
				BaseProvider{
					Filename: templateInvalidTOMLFile.Name(),
				},
				nil,
			},
			expectedError: "Near line 1 (last key parsed 'Hello'): expected key separator '=', but got '<' instead",
			funcMap: template.FuncMap{
				"Foo": func() string {
					return "bar"
				},
			},
			templateObjects: struct{ Name string }{Name: "bar"},
		},
	}

	for _, invalid := range invalids {
		configuration, err := invalid.provider.GetConfiguration(invalid.defaultTemplate, invalid.funcMap, nil)
		if err == nil || !strings.Contains(err.Error(), invalid.expectedError) {
			t.Fatalf("should have generate an error with %q, got %v", invalid.expectedError, err)
		}
		if configuration != nil {
			t.Fatalf("shouldn't have return a configuration object : %v", configuration)
		}
	}
}

func TestGetConfiguration(t *testing.T) {
	templateFile, err := ioutil.TempFile("", "provider-configuration")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(templateFile.Name())
	data := []byte(`[backends]
  [backends.backend1]
    [backends.backend1.circuitbreaker]
      expression = "NetworkErrorRatio() > 0.5"
    [backends.backend1.servers.server1]
    url = "http://172.17.0.2:80"
    weight = 10
    [backends.backend1.servers.server2]
    url = "http://172.17.0.3:80"
    weight = 1

[frontends]
  [frontends.frontend1]
  backend = "backend1"
  passHostHeader = true
    [frontends.frontend11.routes.test_2]
    rule = "Path"
    value = "/test"`)
	err = ioutil.WriteFile(templateFile.Name(), data, 0700)
	if err != nil {
		t.Fatal(err)
	}

	provider := &myProvider{
		BaseProvider{
			Filename: templateFile.Name(),
		},
		nil,
	}
	configuration, err := provider.GetConfiguration(templateFile.Name(), nil, nil)
	if err != nil {
		t.Fatalf("Shouldn't have error out, got %v", err)
	}
	if configuration == nil {
		t.Fatal("Configuration should not be nil, but was")
	}
}

func TestGetConfigurationReturnsCorrectMaxConnConfiguration(t *testing.T) {
	templateFile, err := ioutil.TempFile("", "provider-configuration")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(templateFile.Name())
	data := []byte(`[backends]
  [backends.backend1]
    [backends.backend1.maxconn]
      amount = 10
      extractorFunc = "request.host"`)
	err = ioutil.WriteFile(templateFile.Name(), data, 0700)
	if err != nil {
		t.Fatal(err)
	}

	provider := &myProvider{
		BaseProvider{
			Filename: templateFile.Name(),
		},
		nil,
	}
	configuration, err := provider.GetConfiguration(templateFile.Name(), nil, nil)
	if err != nil {
		t.Fatalf("Shouldn't have error out, got %v", err)
	}
	if configuration == nil {
		t.Fatal("Configuration should not be nil, but was")
	}

	if configuration.Backends["backend1"].MaxConn.Amount != 10 {
		t.Fatal("Configuration did not parse MaxConn.Amount properly")
	}

	if configuration.Backends["backend1"].MaxConn.ExtractorFunc != "request.host" {
		t.Fatal("Configuration did not parse MaxConn.ExtractorFunc properly")
	}
}

func TestNilClientTLS(t *testing.T) {
	provider := &myProvider{
		BaseProvider{
			Filename: "",
		},
		nil,
	}
	_, err := provider.TLS.CreateTLSConfig()
	if err != nil {
		t.Fatal("CreateTLSConfig should assume that consumer does not want a TLS configuration if input is nil")
	}
}

func TestInsecureSkipVerifyClientTLS(t *testing.T) {
	provider := &myProvider{
		BaseProvider{
			Filename: "",
		},
		&types.ClientTLS{
			InsecureSkipVerify: true,
		},
	}
	config, err := provider.TLS.CreateTLSConfig()
	if err != nil {
		t.Fatal("CreateTLSConfig should assume that consumer does not want a TLS configuration if input is nil")
	}
	if !config.InsecureSkipVerify {
		t.Fatal("CreateTLSConfig should support setting only InsecureSkipVerify property")
	}
}

func TestInsecureSkipVerifyFalseClientTLS(t *testing.T) {
	provider := &myProvider{
		BaseProvider{
			Filename: "",
		},
		&types.ClientTLS{
			InsecureSkipVerify: false,
		},
	}
	_, err := provider.TLS.CreateTLSConfig()
	if err == nil {
		t.Fatal("CreateTLSConfig should error if consumer does not set a TLS cert or key configuration and not chooses InsecureSkipVerify to be true")
	}
	t.Log(err)
}

func TestMatchingConstraints(t *testing.T) {
	cases := []struct {
		constraints types.Constraints
		tags        []string
		expected    bool
	}{
		// simple test: must match
		{
			constraints: types.Constraints{
				{
					Key:       "tag",
					MustMatch: true,
					Regex:     "us-east-1",
				},
			},
			tags: []string{
				"us-east-1",
			},
			expected: true,
		},
		// simple test: must match but does not match
		{
			constraints: types.Constraints{
				{
					Key:       "tag",
					MustMatch: true,
					Regex:     "us-east-1",
				},
			},
			tags: []string{
				"us-east-2",
			},
			expected: false,
		},
		// simple test: must not match
		{
			constraints: types.Constraints{
				{
					Key:       "tag",
					MustMatch: false,
					Regex:     "us-east-1",
				},
			},
			tags: []string{
				"us-east-1",
			},
			expected: false,
		},
		// complex test: globbing
		{
			constraints: types.Constraints{
				{
					Key:       "tag",
					MustMatch: true,
					Regex:     "us-east-*",
				},
			},
			tags: []string{
				"us-east-1",
			},
			expected: true,
		},
		// complex test: multiple constraints
		{
			constraints: types.Constraints{
				{
					Key:       "tag",
					MustMatch: true,
					Regex:     "us-east-*",
				},
				{
					Key:       "tag",
					MustMatch: false,
					Regex:     "api",
				},
			},
			tags: []string{
				"api",
				"us-east-1",
			},
			expected: false,
		},
	}

	for i, c := range cases {
		provider := myProvider{
			BaseProvider{
				Constraints: c.constraints,
			},
			nil,
		}
		actual, _ := provider.MatchConstraints(c.tags)
		if actual != c.expected {
			t.Fatalf("test #%v: expected %t, got %t, for %#v", i, c.expected, actual, c.constraints)
		}
	}
}

func TestDefaultFuncMap(t *testing.T) {
	templateFile, err := ioutil.TempFile("", "provider-configuration")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(templateFile.Name())
	data := []byte(`
  [backends]
  [backends.{{ "backend-1" | replace  "-" "" }}]
    [backends.{{ "BACKEND1" | tolower }}.circuitbreaker]
      expression = "NetworkErrorRatio() > 0.5"
    [backends.servers.server1]
    url = "http://172.17.0.2:80"
    weight = 10
    [backends.backend1.servers.server2]
    url = "http://172.17.0.3:80"
    weight = 1

[frontends]
  [frontends.{{normalize "frontend/1"}}]
  {{ $backend := "backend1/test/value" | split  "/" }}
  {{ $backendid := index $backend 1 }}
  {{ if "backend1" | contains "backend" }}
  backend = "backend1"
  {{end}}
  passHostHeader = true
    [frontends.frontend-1.routes.test_2]
    rule = "Path"
    value = "/test"`)
	err = ioutil.WriteFile(templateFile.Name(), data, 0700)
	if err != nil {
		t.Fatal(err)
	}

	provider := &myProvider{
		BaseProvider{
			Filename: templateFile.Name(),
		},
		nil,
	}
	configuration, err := provider.GetConfiguration(templateFile.Name(), nil, nil)
	if err != nil {
		t.Fatalf("Shouldn't have error out, got %v", err)
	}
	if configuration == nil {
		t.Fatal("Configuration should not be nil, but was")
	}
	if _, ok := configuration.Backends["backend1"]; !ok {
		t.Fatal("backend1 should exists, but it not")
	}
	if _, ok := configuration.Frontends["frontend-1"]; !ok {
		t.Fatal("Frontend frontend-1 should exists, but it not")
	}
}

func TestSprigFunctions(t *testing.T) {
	templateFile, err := ioutil.TempFile("", "provider-configuration")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(templateFile.Name())
	data := []byte(`
  {{$backend_name := trimAll "-" uuidv4}}
  [backends]
  [backends.{{$backend_name}}]
    [backends.{{$backend_name}}.circuitbreaker]
    [backends.{{$backend_name}}.servers.server2]
    url = "http://172.17.0.3:80"
    weight = 1

[frontends]
  [frontends.{{normalize "frontend/1"}}]
  backend = "{{$backend_name}}"
  passHostHeader = true
    [frontends.frontend-1.routes.test_2]
    rule = "Path"
    value = "/test"`)
	err = ioutil.WriteFile(templateFile.Name(), data, 0700)
	if err != nil {
		t.Fatal(err)
	}

	provider := &myProvider{
		BaseProvider{
			Filename: templateFile.Name(),
		},
		nil,
	}
	configuration, err := provider.GetConfiguration(templateFile.Name(), nil, nil)
	if err != nil {
		t.Fatalf("Shouldn't have error out, got %v", err)
	}
	if configuration == nil {
		t.Fatal("Configuration should not be nil, but was")
	}
	if len(configuration.Backends) != 1 {
		t.Fatal("one backend should be defined, but it's not")
	}
	if _, ok := configuration.Frontends["frontend-1"]; !ok {
		t.Fatal("Frontend frontend-1 should exists, but it not")
	}
}

func TestBaseProvider_GetConfiguration(t *testing.T) {
	baseProvider := BaseProvider{}

	testCases := []struct {
		name                string
		defaultTemplateFile string
		expectedContent     string
	}{
		{
			defaultTemplateFile: "templates/docker.tmpl",
			expectedContent:     readTemplateFile(t, "./../templates/docker.tmpl"),
		},
		{
			defaultTemplateFile: `template content`,
			expectedContent:     `template content`,
		},
	}

	for _, test := range testCases {
		test := test
		t.Run(test.name, func(t *testing.T) {

			content, err := baseProvider.getTemplateContent(test.defaultTemplateFile)
			require.NoError(t, err)

			assert.Equal(t, test.expectedContent, content)
		})
	}
}

func readTemplateFile(t *testing.T, path string) string {
	t.Helper()
	expectedContent, err := ioutil.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	return string(expectedContent)
}