/*
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 (
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"testing"

	"k8s.io/helm/pkg/repo/repotest"
)

func TestFetchCmd(t *testing.T) {
	hh, err := tempHelmHome(t)
	if err != nil {
		t.Fatal(err)
	}
	cleanup := resetEnv()
	defer func() {
		os.RemoveAll(hh.String())
		cleanup()
	}()
	srv := repotest.NewServer(hh.String())
	defer srv.Stop()

	settings.Home = hh

	// all flags will get "--home=TMDIR -d outdir" appended.
	tests := []struct {
		name         string
		chart        string
		flags        []string
		fail         bool
		wantErrorMsg string
		existFile    string
		existDir     string
		failExpect   string
		expectFile   string
		expectDir    bool
		expectVerify bool
	}{
		{
			name:       "Basic chart fetch",
			chart:      "test/signtest",
			expectFile: "./signtest-0.1.0.tgz",
		},
		{
			name:       "Chart fetch with version",
			chart:      "test/signtest",
			flags:      []string{"--version", "0.1.0"},
			expectFile: "./signtest-0.1.0.tgz",
		},
		{
			name:       "Fail chart fetch with non-existent version",
			chart:      "test/signtest",
			flags:      []string{"--version", "99.1.0"},
			fail:       true,
			failExpect: "no such chart",
		},
		{
			name:       "Fail fetching non-existent chart",
			chart:      "test/nosuchthing",
			failExpect: "Failed to fetch",
			fail:       true,
		},
		{
			name:         "Fetch and verify",
			chart:        "test/signtest",
			flags:        []string{"--verify", "--keyring", "testdata/helm-test-key.pub"},
			expectFile:   "./signtest-0.1.0.tgz",
			expectVerify: true,
		},
		{
			name:       "Fetch and fail verify",
			chart:      "test/reqtest",
			flags:      []string{"--verify", "--keyring", "testdata/helm-test-key.pub"},
			failExpect: "Failed to fetch provenance",
			fail:       true,
		},
		{
			name:       "Fetch and untar",
			chart:      "test/signtest",
			flags:      []string{"--untar", "--untardir", "signtest"},
			expectFile: "./signtest",
			expectDir:  true,
		},
		{
			name:         "Fetch untar when file with same name existed",
			flags:        []string{"test/test1 --untar --untardir test1"},
			existFile:    "test1",
			fail:         true,
			wantErrorMsg: "failed to untar",
		},
		{
			name:         "Fetch untar when dir with same name existed",
			flags:        []string{"test/test2 --untar --untardir test2"},
			existDir:     "test2",
			fail:         true,
			wantErrorMsg: "failed to untar",
		},
		{
			name:         "Fetch, verify, untar",
			chart:        "test/signtest",
			flags:        []string{"--verify", "--keyring", "testdata/helm-test-key.pub", "--untar", "--untardir", "signtest2"},
			expectFile:   "./signtest2",
			expectDir:    true,
			expectVerify: true,
			failExpect:   "Failed to untar signtest",
			fail:         true,
		},
		{
			name:       "Chart fetch using repo URL",
			chart:      "signtest",
			expectFile: "./signtest-0.1.0.tgz",
			flags:      []string{"--repo", srv.URL()},
		},
		{
			name:       "Fail fetching non-existent chart on repo URL",
			chart:      "someChart",
			flags:      []string{"--repo", srv.URL()},
			failExpect: "Failed to fetch chart",
			fail:       true,
		},
		{
			name:       "Specific version chart fetch using repo URL",
			chart:      "signtest",
			expectFile: "./signtest-0.1.0.tgz",
			flags:      []string{"--repo", srv.URL(), "--version", "0.1.0"},
		},
		{
			name:       "Specific version chart fetch using repo URL",
			chart:      "signtest",
			flags:      []string{"--repo", srv.URL(), "--version", "0.2.0"},
			failExpect: "Failed to fetch chart version",
			fail:       true,
		},
	}

	if _, err := srv.CopyCharts("testdata/testcharts/*.tgz*"); err != nil {
		t.Fatal(err)
	}
	if err := srv.LinkIndices(); err != nil {
		t.Fatal(err)
	}

	for _, tt := range tests {
		outdir := filepath.Join(hh.String(), "testout")
		os.RemoveAll(outdir)
		os.Mkdir(outdir, 0755)

		// Create file or Dir before helm pull --untar, see: https://github.com/helm/helm/issues/7182
		if tt.existFile != "" {
			file := filepath.Join(outdir, tt.existFile)
			_, err := os.Create(file)
			if err != nil {
				t.Fatal("err")
			}
		}
		if tt.existDir != "" {
			file := filepath.Join(outdir, tt.existDir)
			err := os.Mkdir(file, 0755)
			if err != nil {
				t.Fatal(err)
			}
		}
		buf := bytes.NewBuffer(nil)
		cmd := newFetchCmd(buf)
		tt.flags = append(tt.flags, "-d", outdir)
		cmd.ParseFlags(tt.flags)
		if err := cmd.RunE(cmd, []string{tt.chart}); err != nil {
			if tt.fail {
				if tt.wantErrorMsg != "" && strings.Contains(tt.wantErrorMsg, err.Error()) {
					t.Fatalf("Actual error %s, not equal to expected error %s", err, tt.wantErrorMsg)
				}
				return
			}
			t.Errorf("%q reported error: %s", tt.name, err)
			continue
		}
		if tt.expectVerify {
			pointerAddressPattern := "0[xX][A-Fa-f0-9]+"
			sha256Pattern := "[A-Fa-f0-9]{64}"
			verificationRegex := regexp.MustCompile(
				fmt.Sprintf("Verification: &{%s sha256:%s signtest-0.1.0.tgz}\n", pointerAddressPattern, sha256Pattern))
			if !verificationRegex.MatchString(buf.String()) {
				t.Errorf("%q: expected match for regex %s, got %s", tt.name, verificationRegex, buf.String())
			}
		}

		ef := filepath.Join(outdir, tt.expectFile)
		fi, err := os.Stat(ef)
		if err != nil {
			t.Errorf("%q: expected a file at %s. %s", tt.name, ef, err)
		}
		if fi.IsDir() != tt.expectDir {
			t.Errorf("%q: expected directory=%t, but it's not.", tt.name, tt.expectDir)
		}
	}
}