/*
   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 system

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

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

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

	fn := "foo"
	fullPath := path.Join(dir, fn)

	wf := File{config.File{
		Path:               fn,
		Content:            "bar",
		RawFilePermissions: "0644",
	}}

	path, err := WriteFile(&wf, dir)
	if err != nil {
		t.Fatalf("Processing of WriteFile failed: %v", err)
	} else if path != fullPath {
		t.Fatalf("WriteFile returned bad path: want %s, got %s", fullPath, path)
	}

	fi, err := os.Stat(fullPath)
	if err != nil {
		t.Fatalf("Unable to stat file: %v", err)
	}

	if fi.Mode() != os.FileMode(0644) {
		t.Errorf("File has incorrect mode: %v", fi.Mode())
	}

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

	if string(contents) != "bar" {
		t.Fatalf("File has incorrect contents")
	}
}

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

	wf := File{config.File{
		Path:               path.Join(dir, "tmp", "foo"),
		Content:            "bar",
		RawFilePermissions: "pants",
	}}

	if _, err := WriteFile(&wf, dir); err == nil {
		t.Fatalf("Expected error to be raised when writing file with invalid permission")
	}
}

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

	fn := "foo"
	fullPath := path.Join(dir, fn)

	wf := File{config.File{
		Path:               fn,
		RawFilePermissions: "744",
	}}

	path, err := WriteFile(&wf, dir)
	if err != nil {
		t.Fatalf("Processing of WriteFile failed: %v", err)
	} else if path != fullPath {
		t.Fatalf("WriteFile returned bad path: want %s, got %s", fullPath, path)
	}

	fi, err := os.Stat(fullPath)
	if err != nil {
		t.Fatalf("Unable to stat file: %v", err)
	}

	if fi.Mode() != os.FileMode(0744) {
		t.Errorf("File has incorrect mode: %v", fi.Mode())
	}
}

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

	fn := "foo"
	fullPath := path.Join(dir, fn)

	wf := File{config.File{
		Path:               fn,
		RawFilePermissions: "0755",
	}}

	path, err := WriteFile(&wf, dir)
	if err != nil {
		t.Fatalf("Processing of WriteFile failed: %v", err)
	} else if path != fullPath {
		t.Fatalf("WriteFile returned bad path: want %s, got %s", fullPath, path)
	}

	fi, err := os.Stat(fullPath)
	if err != nil {
		t.Fatalf("Unable to stat file: %v", err)
	}

	if fi.Mode() != os.FileMode(0755) {
		t.Errorf("File has incorrect mode: %v", fi.Mode())
	}
}

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

	//all of these decode to "bar"
	content_tests := map[string]string{
		"base64":      "YmFy",
		"b64":         "YmFy",
		"gz":          "\x1f\x8b\x08\x08w\x14\x87T\x02\xffok\x00KJ,\x02\x00\xaa\x8c\xffv\x03\x00\x00\x00",
		"gzip":        "\x1f\x8b\x08\x08w\x14\x87T\x02\xffok\x00KJ,\x02\x00\xaa\x8c\xffv\x03\x00\x00\x00",
		"gz+base64":   "H4sIABMVh1QAA0tKLAIAqoz/dgMAAAA=",
		"gzip+base64": "H4sIABMVh1QAA0tKLAIAqoz/dgMAAAA=",
		"gz+b64":      "H4sIABMVh1QAA0tKLAIAqoz/dgMAAAA=",
		"gzip+b64":    "H4sIABMVh1QAA0tKLAIAqoz/dgMAAAA=",
	}

	for encoding, content := range content_tests {
		fullPath := path.Join(dir, encoding)

		wf := File{config.File{
			Path:               encoding,
			Encoding:           encoding,
			Content:            content,
			RawFilePermissions: "0644",
		}}

		path, err := WriteFile(&wf, dir)
		if err != nil {
			t.Fatalf("Processing of WriteFile failed: %v", err)
		} else if path != fullPath {
			t.Fatalf("WriteFile returned bad path: want %s, got %s", fullPath, path)
		}

		fi, err := os.Stat(fullPath)
		if err != nil {
			t.Fatalf("Unable to stat file: %v", err)
		}

		if fi.Mode() != os.FileMode(0644) {
			t.Errorf("File has incorrect mode: %v", fi.Mode())
		}

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

		if string(contents) != "bar" {
			t.Fatalf("File has incorrect contents: '%s'", contents)
		}
	}
}

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

	content_encodings := []string{
		"base64",
		"b64",
		"gz",
		"gzip",
		"gz+base64",
		"gzip+base64",
		"gz+b64",
		"gzip+b64",
	}

	for _, encoding := range content_encodings {
		wf := File{config.File{
			Path:     path.Join(dir, "tmp", "foo"),
			Content:  "@&*#%invalid data*@&^#*&",
			Encoding: encoding,
		}}

		if _, err := WriteFile(&wf, dir); err == nil {
			t.Fatalf("Expected error to be raised when writing file with encoding")
		}
	}
}

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

	wf := File{config.File{
		Path:     path.Join(dir, "tmp", "foo"),
		Content:  "",
		Encoding: "no-such-encoding",
	}}

	if _, err := WriteFile(&wf, dir); err == nil {
		t.Fatalf("Expected error to be raised when writing file with encoding")
	}
}