/*
   Copyright 2014 CoreOS, Inc.

   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 initialize

import (
	"io/ioutil"
	"os"
	"path"
	"testing"

	"github.com/coreos/coreos-cloudinit/system"
)

func TestEnvironmentApply(t *testing.T) {
	os.Setenv("COREOS_PUBLIC_IPV4", "1.2.3.4")
	os.Setenv("COREOS_PRIVATE_IPV4", "5.6.7.8")
	os.Setenv("COREOS_PUBLIC_IPV6", "1234::")
	os.Setenv("COREOS_PRIVATE_IPV6", "5678::")
	for _, tt := range []struct {
		subs  map[string]string
		input string
		out   string
	}{
		{
			// Substituting both values directly should always take precedence
			// over environment variables
			map[string]string{
				"$public_ipv4":  "192.0.2.3",
				"$private_ipv4": "192.0.2.203",
				"$public_ipv6":  "fe00:1234::",
				"$private_ipv6": "fe00:5678::",
			},
			`[Service]
ExecStart=/usr/bin/echo "$public_ipv4 $public_ipv6"
ExecStop=/usr/bin/echo $private_ipv4 $private_ipv6
ExecStop=/usr/bin/echo $unknown`,
			`[Service]
ExecStart=/usr/bin/echo "192.0.2.3 fe00:1234::"
ExecStop=/usr/bin/echo 192.0.2.203 fe00:5678::
ExecStop=/usr/bin/echo $unknown`,
		},
		{
			// Substituting one value directly while falling back with the other
			map[string]string{"$private_ipv4": "127.0.0.1"},
			"$private_ipv4\n$public_ipv4",
			"127.0.0.1\n1.2.3.4",
		},
		{
			// Falling back to environment variables for both values
			map[string]string{"foo": "bar"},
			"$private_ipv4\n$public_ipv4",
			"5.6.7.8\n1.2.3.4",
		},
		{
			// No substitutions
			nil,
			"$private_ipv4\nfoobar",
			"5.6.7.8\nfoobar",
		},
		{
			// Escaping substitutions
			map[string]string{"$private_ipv4": "127.0.0.1"},
			`\$private_ipv4
$private_ipv4
addr: \$private_ipv4
\\$private_ipv4`,
			`$private_ipv4
127.0.0.1
addr: $private_ipv4
\$private_ipv4`,
		},
		{
			// No substitutions with escaping
			nil,
			"\\$test\n$test",
			"\\$test\n$test",
		},
	} {

		env := NewEnvironment("./", "./", "./", "", "", tt.subs)
		got := env.Apply(tt.input)
		if got != tt.out {
			t.Fatalf("Environment incorrectly applied.\ngot:\n%s\nwant:\n%s", got, tt.out)
		}
	}
}

func TestEnvironmentFile(t *testing.T) {
	subs := map[string]string{
		"$public_ipv4":  "1.2.3.4",
		"$private_ipv4": "5.6.7.8",
		"$public_ipv6":  "1234::",
		"$private_ipv6": "5678::",
	}
	expect := "COREOS_PRIVATE_IPV4=5.6.7.8\nCOREOS_PRIVATE_IPV6=5678::\nCOREOS_PUBLIC_IPV4=1.2.3.4\nCOREOS_PUBLIC_IPV6=1234::\n"

	dir, err := ioutil.TempDir(os.TempDir(), "coreos-cloudinit-")
	if err != nil {
		t.Fatalf("Unable to create tempdir: %v", err)
	}
	defer os.RemoveAll(dir)

	env := NewEnvironment("./", "./", "./", "", "", subs)
	ef := env.DefaultEnvironmentFile()
	err = system.WriteEnvFile(ef, dir)
	if err != nil {
		t.Fatalf("WriteEnvFile failed: %v", err)
	}

	fullPath := path.Join(dir, "etc", "environment")
	contents, err := ioutil.ReadFile(fullPath)
	if err != nil {
		t.Fatalf("Unable to read expected file: %v", err)
	}

	if string(contents) != expect {
		t.Fatalf("File has incorrect contents: %q", contents)
	}
}

func TestEnvironmentFileNil(t *testing.T) {
	subs := map[string]string{
		"$public_ipv4":  "",
		"$private_ipv4": "",
		"$public_ipv6":  "",
		"$private_ipv6": "",
	}

	env := NewEnvironment("./", "./", "./", "", "", subs)
	ef := env.DefaultEnvironmentFile()
	if ef != nil {
		t.Fatalf("Environment file not nil: %v", ef)
	}
}