package helpers

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/spf13/afero"
	"github.com/spf13/viper"
)

func TestMakePath(t *testing.T) {
	tests := []struct {
		input    string
		expected string
	}{
		{"  Foo bar  ", "Foo-bar"},
		{"Foo.Bar/foo_Bar-Foo", "Foo.Bar/foo_Bar-Foo"},
		{"fOO,bar:foo%bAR", "fOObarfoobAR"},
		{"FOo/BaR.html", "FOo/BaR.html"},
		{"трям/трям", "трям/трям"},
		{"은행", "은행"},
		{"Банковский кассир", "Банковский-кассир"},
	}

	for _, test := range tests {
		output := MakePath(test.input)
		if output != test.expected {
			t.Errorf("Expected %#v, got %#v\n", test.expected, output)
		}
	}
}

func TestMakePathToLower(t *testing.T) {
	tests := []struct {
		input    string
		expected string
	}{
		{"  FOO bar  ", "foo-bar"},
		{"Foo.Bar/fOO_bAr-Foo", "foo.bar/foo_bar-foo"},
		{"FOO,bar:Foo%Bar", "foobarfoobar"},
		{"foo/BAR.HTML", "foo/bar.html"},
		{"трям/трям", "трям/трям"},
		{"은행", "은행"},
	}
	for _, test := range tests {
		output := MakePathToLower(test.input)
		if output != test.expected {
			t.Errorf("Expected %#v, got %#v\n", test.expected, output)
		}
	}
}

func TestGetRelativePath(t *testing.T) {
	tests := []struct {
		path   string
		base   string
		expect interface{}
	}{
		{filepath.FromSlash("/a/b"), filepath.FromSlash("/a"), filepath.FromSlash("b")},
		{filepath.FromSlash("/a/b/c/"), filepath.FromSlash("/a"), filepath.FromSlash("b/c/")},
		{filepath.FromSlash("/c"), filepath.FromSlash("/a/b"), filepath.FromSlash("../../c")},
		{filepath.FromSlash("/c"), "", false},
	}
	for i, this := range tests {
		// ultimately a fancy wrapper around filepath.Rel
		result, err := GetRelativePath(this.path, this.base)

		if b, ok := this.expect.(bool); ok && !b {
			if err == nil {
				t.Errorf("[%d] GetRelativePath didn't return an expected error", i)
			}
		} else {
			if err != nil {
				t.Errorf("[%d] GetRelativePath failed: %s", i, err)
				continue
			}
			if result != this.expect {
				t.Errorf("[%d] GetRelativePath got %v but expected %v", i, result, this.expect)
			}
		}

	}
}

func TestMakePathRelative(t *testing.T) {
	type test struct {
		inPath, path1, path2, output string
	}

	data := []test{
		{"/abc/bcd/ab.css", "/abc/bcd", "/bbc/bcd", "/ab.css"},
		{"/abc/bcd/ab.css", "/abcd/bcd", "/abc/bcd", "/ab.css"},
	}

	for i, d := range data {
		output, _ := MakePathRelative(d.inPath, d.path1, d.path2)
		if d.output != output {
			t.Errorf("Test #%d failed. Expected %q got %q", i, d.output, output)
		}
	}
	_, error := MakePathRelative("a/b/c.ss", "/a/c", "/d/c", "/e/f")

	if error == nil {
		t.Errorf("Test failed, expected error")
	}
}

func TestGetDottedRelativePath(t *testing.T) {
	// on Windows this will receive both kinds, both country and western ...
	for _, f := range []func(string) string{filepath.FromSlash, func(s string) string { return s }} {
		doTestGetDottedRelativePath(f, t)
	}

}

func doTestGetDottedRelativePath(urlFixer func(string) string, t *testing.T) {
	type test struct {
		input, expected string
	}
	data := []test{
		{"", "./"},
		{urlFixer("/"), "./"},
		{urlFixer("post"), "../"},
		{urlFixer("/post"), "../"},
		{urlFixer("post/"), "../"},
		{urlFixer("tags/foo.html"), "../"},
		{urlFixer("/tags/foo.html"), "../"},
		{urlFixer("/post/"), "../"},
		{urlFixer("////post/////"), "../"},
		{urlFixer("/foo/bar/index.html"), "../../"},
		{urlFixer("/foo/bar/foo/"), "../../../"},
		{urlFixer("/foo/bar/foo"), "../../../"},
		{urlFixer("foo/bar/foo/"), "../../../"},
		{urlFixer("foo/bar/foo/bar"), "../../../../"},
		{"404.html", "./"},
		{"404.xml", "./"},
		{"/404.html", "./"},
	}
	for i, d := range data {
		output := GetDottedRelativePath(d.input)
		if d.expected != output {
			t.Errorf("Test %d failed. Expected %q got %q", i, d.expected, output)
		}
	}
}

func TestMakeTitle(t *testing.T) {
	type test struct {
		input, expected string
	}
	data := []test{
		{"Make-Title", "Make Title"},
		{"MakeTitle", "MakeTitle"},
		{"make_title", "make_title"},
	}
	for i, d := range data {
		output := MakeTitle(d.input)
		if d.expected != output {
			t.Errorf("Test %d failed. Expected %q got %q", i, d.expected, output)
		}
	}
}

// Replace Extension is probably poorly named, but the intent of the
// function is to accept a path and return only the file name with a
// new extension. It's intentionally designed to strip out the path
// and only provide the name. We should probably rename the function to
// be more explicit at some point.
func TestReplaceExtension(t *testing.T) {
	type test struct {
		input, newext, expected string
	}
	data := []test{
		// These work according to the above defination
		{"/some/random/path/file.xml", "html", "file.html"},
		{"/banana.html", "xml", "banana.xml"},
		{"./banana.html", "xml", "banana.xml"},
		{"banana/pie/index.html", "xml", "index.xml"},
		{"../pies/fish/index.html", "xml", "index.xml"},
		// but these all fail
		{"filename-without-an-ext", "ext", "filename-without-an-ext.ext"},
		{"/filename-without-an-ext", "ext", "filename-without-an-ext.ext"},
		{"/directory/mydir/", "ext", ".ext"},
		{"mydir/", "ext", ".ext"},
	}

	for i, d := range data {
		output := ReplaceExtension(filepath.FromSlash(d.input), d.newext)
		if d.expected != output {
			t.Errorf("Test %d failed. Expected %q got %q", i, d.expected, output)
		}
	}
}

func TestDirExists(t *testing.T) {
	type test struct {
		input    string
		expected bool
	}

	data := []test{
		{".", true},
		{"./", true},
		{"..", true},
		{"../", true},
		{"./..", true},
		{"./../", true},
		{os.TempDir(), true},
		{os.TempDir() + FilePathSeparator, true},
		{"/", true},
		{"/some-really-random-directory-name", false},
		{"/some/really/random/directory/name", false},
		{"./some-really-random-local-directory-name", false},
		{"./some/really/random/local/directory/name", false},
	}

	for i, d := range data {
		exists, _ := DirExists(filepath.FromSlash(d.input), new(afero.OsFs))
		if d.expected != exists {
			t.Errorf("Test %d failed. Expected %t got %t", i, d.expected, exists)
		}
	}
}

func TestIsDir(t *testing.T) {
	type test struct {
		input    string
		expected bool
	}
	data := []test{
		{"./", true},
		{"/", true},
		{"./this-directory-does-not-existi", false},
		{"/this-absolute-directory/does-not-exist", false},
	}

	for i, d := range data {

		exists, _ := IsDir(d.input, new(afero.OsFs))
		if d.expected != exists {
			t.Errorf("Test %d failed. Expected %t got %t", i, d.expected, exists)
		}
	}
}

func TestIsEmpty(t *testing.T) {
	zeroSizedFile, _ := createZeroSizedFileInTempDir()
	defer deleteFileInTempDir(zeroSizedFile)
	nonZeroSizedFile, _ := createNonZeroSizedFileInTempDir()
	defer deleteFileInTempDir(nonZeroSizedFile)
	emptyDirectory, _ := createEmptyTempDir()
	defer deleteTempDir(emptyDirectory)
	nonEmptyZeroLengthFilesDirectory, _ := createTempDirWithZeroLengthFiles()
	defer deleteTempDir(nonEmptyZeroLengthFilesDirectory)
	nonEmptyNonZeroLengthFilesDirectory, _ := createTempDirWithNonZeroLengthFiles()
	defer deleteTempDir(nonEmptyNonZeroLengthFilesDirectory)
	nonExistentFile := os.TempDir() + "/this-file-does-not-exist.txt"
	nonExistentDir := os.TempDir() + "/this/direcotry/does/not/exist/"

	fileDoesNotExist := fmt.Errorf("%q path does not exist", nonExistentFile)
	dirDoesNotExist := fmt.Errorf("%q path does not exist", nonExistentDir)

	type test struct {
		input          string
		expectedResult bool
		expectedErr    error
	}

	data := []test{
		{zeroSizedFile.Name(), true, nil},
		{nonZeroSizedFile.Name(), false, nil},
		{emptyDirectory, true, nil},
		{nonEmptyZeroLengthFilesDirectory, false, nil},
		{nonEmptyNonZeroLengthFilesDirectory, false, nil},
		{nonExistentFile, false, fileDoesNotExist},
		{nonExistentDir, false, dirDoesNotExist},
	}
	for i, d := range data {
		exists, err := IsEmpty(d.input, new(afero.OsFs))
		if d.expectedResult != exists {
			t.Errorf("Test %d failed. Expected result %t got %t", i, d.expectedResult, exists)
		}
		if d.expectedErr != nil {
			if d.expectedErr.Error() != err.Error() {
				t.Errorf("Test %d failed. Expected %q(%#v) got %q(%#v)", i, d.expectedErr, d.expectedErr, err, err)
			}
		} else {
			if d.expectedErr != err {
				t.Errorf("Test %d failed. Expected %q(%#v) got %q(%#v)", i, d.expectedErr, d.expectedErr, err, err)
			}
		}
	}
}

func createZeroSizedFileInTempDir() (*os.File, error) {
	filePrefix := "_path_test_"
	f, e := ioutil.TempFile("", filePrefix) // dir is os.TempDir()
	if e != nil {
		// if there was an error no file was created.
		// => no requirement to delete the file
		return nil, e
	}
	return f, nil
}

func createNonZeroSizedFileInTempDir() (*os.File, error) {
	f, err := createZeroSizedFileInTempDir()
	if err != nil {
		// no file ??
	}
	byteString := []byte("byteString")
	err = ioutil.WriteFile(f.Name(), byteString, 0644)
	if err != nil {
		// delete the file
		deleteFileInTempDir(f)
		return nil, err
	}
	return f, nil
}

func deleteFileInTempDir(f *os.File) {
	err := os.Remove(f.Name())
	if err != nil {
		// now what?
	}
}

func createEmptyTempDir() (string, error) {
	dirPrefix := "_dir_prefix_"
	d, e := ioutil.TempDir("", dirPrefix) // will be in os.TempDir()
	if e != nil {
		// no directory to delete - it was never created
		return "", e
	}
	return d, nil
}

func createTempDirWithZeroLengthFiles() (string, error) {
	d, dirErr := createEmptyTempDir()
	if dirErr != nil {
		//now what?
	}
	filePrefix := "_path_test_"
	_, fileErr := ioutil.TempFile(d, filePrefix) // dir is os.TempDir()
	if fileErr != nil {
		// if there was an error no file was created.
		// but we need to remove the directory to clean-up
		deleteTempDir(d)
		return "", fileErr
	}
	// the dir now has one, zero length file in it
	return d, nil

}

func createTempDirWithNonZeroLengthFiles() (string, error) {
	d, dirErr := createEmptyTempDir()
	if dirErr != nil {
		//now what?
	}
	filePrefix := "_path_test_"
	f, fileErr := ioutil.TempFile(d, filePrefix) // dir is os.TempDir()
	if fileErr != nil {
		// if there was an error no file was created.
		// but we need to remove the directory to clean-up
		deleteTempDir(d)
		return "", fileErr
	}
	byteString := []byte("byteString")
	fileErr = ioutil.WriteFile(f.Name(), byteString, 0644)
	if fileErr != nil {
		// delete the file
		deleteFileInTempDir(f)
		// also delete the directory
		deleteTempDir(d)
		return "", fileErr
	}

	// the dir now has one, zero length file in it
	return d, nil

}

func deleteTempDir(d string) {
	err := os.RemoveAll(d)
	if err != nil {
		// now what?
	}
}

func TestExists(t *testing.T) {
	zeroSizedFile, _ := createZeroSizedFileInTempDir()
	defer deleteFileInTempDir(zeroSizedFile)
	nonZeroSizedFile, _ := createNonZeroSizedFileInTempDir()
	defer deleteFileInTempDir(nonZeroSizedFile)
	emptyDirectory, _ := createEmptyTempDir()
	defer deleteTempDir(emptyDirectory)
	nonExistentFile := os.TempDir() + "/this-file-does-not-exist.txt"
	nonExistentDir := os.TempDir() + "/this/direcotry/does/not/exist/"

	type test struct {
		input          string
		expectedResult bool
		expectedErr    error
	}

	data := []test{
		{zeroSizedFile.Name(), true, nil},
		{nonZeroSizedFile.Name(), true, nil},
		{emptyDirectory, true, nil},
		{nonExistentFile, false, nil},
		{nonExistentDir, false, nil},
	}
	for i, d := range data {
		exists, err := Exists(d.input, new(afero.OsFs))
		if d.expectedResult != exists {
			t.Errorf("Test %d failed. Expected result %t got %t", i, d.expectedResult, exists)
		}
		if d.expectedErr != err {
			t.Errorf("Test %d failed. Expected %q got %q", i, d.expectedErr, err)
		}
	}

}

func TestAbsPathify(t *testing.T) {
	defer viper.Reset()

	type test struct {
		inPath, workingDir, expected string
	}
	data := []test{
		{os.TempDir(), filepath.FromSlash("/work"), filepath.Clean(os.TempDir())}, // TempDir has trailing slash
		{"dir", filepath.FromSlash("/work"), filepath.FromSlash("/work/dir")},
	}

	windowsData := []test{
		{"c:\\banana\\..\\dir", "c:\\foo", "c:\\dir"},
		{"\\dir", "c:\\foo", "c:\\foo\\dir"},
		{"c:\\", "c:\\foo", "c:\\"},
	}

	unixData := []test{
		{"/banana/../dir/", "/work", "/dir"},
	}

	for i, d := range data {
		viper.Reset()
		// todo see comment in AbsPathify
		viper.Set("WorkingDir", d.workingDir)

		expected := AbsPathify(d.inPath)
		if d.expected != expected {
			t.Errorf("Test %d failed. Expected %q but got %q", i, d.expected, expected)
		}
	}
	t.Logf("Running platform specific path tests for %s", runtime.GOOS)
	if runtime.GOOS == "windows" {
		for i, d := range windowsData {
			viper.Set("WorkingDir", d.workingDir)

			expected := AbsPathify(d.inPath)
			if d.expected != expected {
				t.Errorf("Test %d failed. Expected %q but got %q", i, d.expected, expected)
			}
		}
	} else {
		for i, d := range unixData {
			viper.Set("WorkingDir", d.workingDir)

			expected := AbsPathify(d.inPath)
			if d.expected != expected {
				t.Errorf("Test %d failed. Expected %q but got %q", i, d.expected, expected)
			}
		}
	}

}

func TestFilename(t *testing.T) {
	type test struct {
		input, expected string
	}
	data := []test{
		{"index.html", "index"},
		{"./index.html", "index"},
		{"/index.html", "index"},
		{"index", "index"},
		{"/tmp/index.html", "index"},
		{"./filename-no-ext", "filename-no-ext"},
		{"/filename-no-ext", "filename-no-ext"},
		{"filename-no-ext", "filename-no-ext"},
		{"directoy/", ""}, // no filename case??
		{"directory/.hidden.ext", ".hidden"},
		{"./directory/../~/banana/gold.fish", "gold"},
		{"../directory/banana.man", "banana"},
		{"~/mydir/filename.ext", "filename"},
		{"./directory//tmp/filename.ext", "filename"},
	}

	for i, d := range data {
		output := Filename(filepath.FromSlash(d.input))
		if d.expected != output {
			t.Errorf("Test %d failed. Expected %q got %q", i, d.expected, output)
		}
	}
}

func TestFileAndExt(t *testing.T) {
	type test struct {
		input, expectedFile, expectedExt string
	}
	data := []test{
		{"index.html", "index", ".html"},
		{"./index.html", "index", ".html"},
		{"/index.html", "index", ".html"},
		{"index", "index", ""},
		{"/tmp/index.html", "index", ".html"},
		{"./filename-no-ext", "filename-no-ext", ""},
		{"/filename-no-ext", "filename-no-ext", ""},
		{"filename-no-ext", "filename-no-ext", ""},
		{"directoy/", "", ""}, // no filename case??
		{"directory/.hidden.ext", ".hidden", ".ext"},
		{"./directory/../~/banana/gold.fish", "gold", ".fish"},
		{"../directory/banana.man", "banana", ".man"},
		{"~/mydir/filename.ext", "filename", ".ext"},
		{"./directory//tmp/filename.ext", "filename", ".ext"},
	}

	for i, d := range data {
		file, ext := FileAndExt(filepath.FromSlash(d.input), fpb)
		if d.expectedFile != file {
			t.Errorf("Test %d failed. Expected filename %q got %q.", i, d.expectedFile, file)
		}
		if d.expectedExt != ext {
			t.Errorf("Test %d failed. Expected extension %q got %q.", i, d.expectedExt, ext)
		}
	}

}

func TestGuessSection(t *testing.T) {
	type test struct {
		input, expected string
	}

	data := []test{
		{"/", ""},
		{"", ""},
		{"/content", ""},
		{"content/", ""},
		{"/content/", ""}, // /content/ is a special case. It will never be the section
		{"/blog", ""},
		{"/blog/", "blog"},
		{"blog", ""},
		{"content/blog", ""},
		{"/content/blog/", "blog"},
		{"/content/blog", ""}, // Lack of trailing slash indicates 'blog' is not a directory.
		{"content/blog/", "blog"},
		{"/contents/myblog/", "contents"},
		{"/contents/yourblog", "contents"},
		{"/contents/ourblog/", "contents"},
		{"/content/myblog/", "myblog"},
		{"/content/yourblog", ""},
		{"/content/ourblog/", "ourblog"},
	}

	for i, d := range data {
		expected := GuessSection(filepath.FromSlash(d.input))
		if d.expected != expected {
			t.Errorf("Test %d failed. Expected %q got %q", i, d.expected, expected)
		}
	}
}

func TestPathPrep(t *testing.T) {

}

func TestPrettifyPath(t *testing.T) {

}

func TestRemoveSubpaths(t *testing.T) {
	got := RemoveSubpaths([]string{"hello", "hello/world", "foo/bar", ""})
	expect := []string{"hello", "foo/bar"}
	if !reflect.DeepEqual(got, expect) {
		t.Errorf("Expected %q but got %q", expect, got)
	}
}

func TestFindCWD(t *testing.T) {
	type test struct {
		expectedDir string
		expectedErr error
	}

	//cwd, _ := os.Getwd()
	data := []test{
	//{cwd, nil},
	// Commenting this out. It doesn't work properly.
	// There's a good reason why we don't use os.Getwd(), it doesn't actually work the way we want it to.
	// I really don't know a better way to test this function. - SPF 2014.11.04
	}
	for i, d := range data {
		dir, err := FindCWD()
		if d.expectedDir != dir {
			t.Errorf("Test %d failed. Expected %q but got %q", i, d.expectedDir, dir)
		}
		if d.expectedErr != err {
			t.Errorf("Test %d failed. Expected %q but got %q", i, d.expectedErr, err)
		}
	}
}

func TestSafeWriteToDisk(t *testing.T) {
	emptyFile, _ := createZeroSizedFileInTempDir()
	defer deleteFileInTempDir(emptyFile)
	tmpDir, _ := createEmptyTempDir()
	defer deleteTempDir(tmpDir)

	randomString := "This is a random string!"
	reader := strings.NewReader(randomString)

	fileExists := fmt.Errorf("%v already exists", emptyFile.Name())

	type test struct {
		filename    string
		expectedErr error
	}

	now := time.Now().Unix()
	nowStr := strconv.FormatInt(now, 10)
	data := []test{
		{emptyFile.Name(), fileExists},
		{tmpDir + "/" + nowStr, nil},
	}

	for i, d := range data {
		e := SafeWriteToDisk(d.filename, reader, new(afero.OsFs))
		if d.expectedErr != nil {
			if d.expectedErr.Error() != e.Error() {
				t.Errorf("Test %d failed. Expected error %q but got %q", i, d.expectedErr.Error(), e.Error())
			}
		} else {
			if d.expectedErr != e {
				t.Errorf("Test %d failed. Expected %q but got %q", i, d.expectedErr, e)
			}
			contents, _ := ioutil.ReadFile(d.filename)
			if randomString != string(contents) {
				t.Errorf("Test %d failed. Expected contents %q but got %q", i, randomString, string(contents))
			}
		}
		reader.Seek(0, 0)
	}
}

func TestWriteToDisk(t *testing.T) {
	emptyFile, _ := createZeroSizedFileInTempDir()
	defer deleteFileInTempDir(emptyFile)
	tmpDir, _ := createEmptyTempDir()
	defer deleteTempDir(tmpDir)

	randomString := "This is a random string!"
	reader := strings.NewReader(randomString)

	type test struct {
		filename    string
		expectedErr error
	}

	now := time.Now().Unix()
	nowStr := strconv.FormatInt(now, 10)
	data := []test{
		{emptyFile.Name(), nil},
		{tmpDir + "/" + nowStr, nil},
	}

	for i, d := range data {
		e := WriteToDisk(d.filename, reader, new(afero.OsFs))
		if d.expectedErr != e {
			t.Errorf("Test %d failed. WriteToDisk Error Expected %q but got %q", i, d.expectedErr, e)
		}
		contents, e := ioutil.ReadFile(d.filename)
		if e != nil {
			t.Errorf("Test %d failed. Could not read file %s. Reason: %s\n", i, d.filename, e)
		}
		if randomString != string(contents) {
			t.Errorf("Test %d failed. Expected contents %q but got %q", i, randomString, string(contents))
		}
		reader.Seek(0, 0)
	}
}

func TestGetTempDir(t *testing.T) {
	dir := os.TempDir()
	if FilePathSeparator != dir[len(dir)-1:] {
		dir = dir + FilePathSeparator
	}
	testDir := "hugoTestFolder" + FilePathSeparator
	tests := []struct {
		input    string
		expected string
	}{
		{"", dir},
		{testDir + "  Foo bar  ", dir + testDir + "--Foo-bar" + FilePathSeparator},
		{testDir + "Foo.Bar/foo_Bar-Foo", dir + testDir + "Foo.Bar/foo_Bar-Foo" + FilePathSeparator},
		{testDir + "fOO,bar:foo%bAR", dir + testDir + "fOObarfoobAR" + FilePathSeparator},
		{testDir + "FOo/BaR.html", dir + testDir + "FOo/BaR.html" + FilePathSeparator},
		{testDir + "трям/трям", dir + testDir + "трям/трям" + FilePathSeparator},
		{testDir + "은행", dir + testDir + "은행" + FilePathSeparator},
		{testDir + "Банковский кассир", dir + testDir + "Банковский-кассир" + FilePathSeparator},
	}

	for _, test := range tests {
		output := GetTempDir(test.input, new(afero.MemMapFs))
		if output != test.expected {
			t.Errorf("Expected %#v, got %#v\n", test.expected, output)
		}
	}
}