/*
Copyright The Helm 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.
*/

package main

import (
	"bufio"
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

var (
	subchart1ChartPath = "./../../pkg/chartutil/testdata/subpop/charts/subchart1"
	frobnitzChartPath  = "./../../pkg/chartutil/testdata/frobnitz"
)

func TestTemplateCmd(t *testing.T) {
	subchart1AbsChartPath, err := filepath.Abs(subchart1ChartPath)
	if err != nil {
		t.Fatal(err)
	}
	tests := []struct {
		name        string
		desc        string
		args        []string
		expectKey   string
		expectValue string
		expectError string
	}{
		{
			name:        "check_name",
			desc:        "check for a known name in chart",
			args:        []string{subchart1ChartPath},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "protocol: TCP\n    name: nginx",
		},
		{
			name:        "check_set_name",
			desc:        "verify --set values exist",
			args:        []string{subchart1ChartPath, "-x", "templates/service.yaml", "--set", "service.name=apache"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "protocol: TCP\n    name: apache",
		},
		{
			name:        "check_execute",
			desc:        "verify --execute single template",
			args:        []string{subchart1ChartPath, "-x", "templates/service.yaml", "--set", "service.name=apache"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "protocol: TCP\n    name: apache",
		},
		{
			name:        "check_execute_non_existent",
			desc:        "verify --execute fails on a template that doesn't exist",
			args:        []string{subchart1ChartPath, "-x", "templates/thisdoesn'texist.yaml"},
			expectError: "could not find template",
		},
		{
			name:        "check_execute_absolute",
			desc:        "verify --execute single template",
			args:        []string{subchart1ChartPath, "-x", filepath.Join(subchart1AbsChartPath, "templates", "service.yaml"), "--set", "service.name=apache"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "protocol: TCP\n    name: apache",
		},
		{
			name:        "check_execute_subchart_template",
			desc:        "verify --execute single template on a subchart template",
			args:        []string{subchart1ChartPath, "-x", "charts/subcharta/templates/service.yaml", "--set", "subcharta.service.name=foobar"},
			expectKey:   "subchart1/charts/subcharta/templates/service.yaml",
			expectValue: "protocol: TCP\n    name: foobar",
		},
		{
			name:        "check_execute_subchart_template_for_tgz_subchart",
			desc:        "verify --execute single template on a subchart template where the subchart is a .tgz in the chart directory",
			args:        []string{frobnitzChartPath, "-x", "charts/mariner/templates/placeholder.tpl", "--set", "mariner.name=moon"},
			expectKey:   "frobnitz/charts/mariner/templates/placeholder.tpl",
			expectValue: "Goodbye moon",
		},
		{
			name:        "check_namespace",
			desc:        "verify --namespace",
			args:        []string{subchart1ChartPath, "--namespace", "test"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "namespace: \"test\"",
		},
		{
			name:        "check_release_name",
			desc:        "verify --release exists",
			args:        []string{subchart1ChartPath, "--name", "test"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "release-name: \"test\"",
		},
		{
			name:        "check_invalid_name_uppercase",
			desc:        "verify the release name using capitals is invalid",
			args:        []string{subchart1ChartPath, "--name", "FOO"},
			expectKey:   "subchart1/templates/service.yaml",
			expectError: "is invalid",
		},
		{
			name:        "check_invalid_name_uppercase",
			desc:        "verify the release name using periods is invalid",
			args:        []string{subchart1ChartPath, "--name", "foo.bar"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "release-name: \"foo.bar\"",
		},
		{
			name:        "check_invalid_name_uppercase",
			desc:        "verify the release name using underscores is invalid",
			args:        []string{subchart1ChartPath, "--name", "foo_bar"},
			expectKey:   "subchart1/templates/service.yaml",
			expectError: "is invalid",
		},
		{
			name:        "check_release_is_install",
			desc:        "verify --is-upgrade toggles .Release.IsInstall",
			args:        []string{subchart1ChartPath, "--is-upgrade=false"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "release-is-install: \"true\"",
		},
		{
			name:        "check_release_is_upgrade",
			desc:        "verify --is-upgrade toggles .Release.IsUpgrade",
			args:        []string{subchart1ChartPath, "--is-upgrade", "true"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "release-is-upgrade: \"true\"",
		},
		{
			name:        "check_notes",
			desc:        "verify --notes shows notes",
			args:        []string{subchart1ChartPath, "--notes", "true"},
			expectKey:   "subchart1/templates/NOTES.txt",
			expectValue: "Sample notes for subchart1",
		},
		{
			name:        "check_values_files",
			desc:        "verify --values files values exist",
			args:        []string{subchart1ChartPath, "--values", subchart1ChartPath + "/charts/subchartA/values.yaml"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "name: apache",
		},
		{
			name:        "check_invalid_name_template",
			desc:        "verify the release name generate by template is invalid",
			args:        []string{subchart1ChartPath, "--name-template", "foobar-{{ b64enc \"abc\" }}-baz"},
			expectError: "is invalid",
		},
		{
			name:        "check_name_template",
			desc:        "verify --name-template result exists",
			args:        []string{subchart1ChartPath, "--name-template", "foobar-{{ lower \"ABC\" }}-baz"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "release-name: \"foobar-abc-baz\"",
		},
		{
			name:        "check_kube_version",
			desc:        "verify --kube-version overrides the kubernetes version",
			args:        []string{subchart1ChartPath, "--kube-version", "1.6"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "kube-version/major: \"1\"\n    kube-version/minor: \"6\"\n    kube-version/gitversion: \"v1.6.0\"",
		},
		{
			name:        "check_kube_api_versions",
			desc:        "verify --api-versions overrides kubernetes api versions",
			args:        []string{subchart1ChartPath, "--api-versions", "helm.k8s.io/test"},
			expectKey:   "subchart1/templates/service.yaml",
			expectValue: "kube-api-version/test: v1",
		},
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			// execute template command
			out := bytes.NewBuffer(nil)
			cmd := newTemplateCmd(out)
			cmd.SetArgs(tt.args)
			err := cmd.Execute()

			if tt.expectError != "" {
				if err == nil {
					t.Errorf("expected err: %s, but no error occurred", tt.expectError)
				}
				// non nil error, check if it contains the expected error
				if strings.Contains(err.Error(), tt.expectError) {
					// had the error we were looking for, this test case is
					// done
					return
				}
				t.Fatalf("expected err: %q, got: %q", tt.expectError, err)
			} else if err != nil {
				t.Errorf("expected no error, got %v", err)
			}
			// scan yaml into map[<path>]yaml
			scanner := bufio.NewScanner(out)
			next := false
			lastKey := ""
			m := map[string]string{}
			for scanner.Scan() {
				if scanner.Text() == "---" {
					next = true
				} else if next {
					// remove '# Source: '
					head := "# Source: "
					lastKey = scanner.Text()[len(head):]
					next = false
				} else {
					m[lastKey] = m[lastKey] + scanner.Text() + "\n"
				}
			}
			if err := scanner.Err(); err != nil {
				fmt.Fprintln(os.Stderr, "reading standard input:", err)
			}
			if v, ok := m[tt.expectKey]; ok {
				if !strings.Contains(v, tt.expectValue) {
					t.Errorf("failed to match expected value %s in %s", tt.expectValue, v)
				}
			} else {
				t.Errorf("could not find key %s", tt.expectKey)
			}
		})
	}
}