package afero

import (
	"os"
	"path/filepath"
	"testing"
	"time"
)

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

	data := []test{
		{".", FilePathSeparator},
		{"./", FilePathSeparator},
		{"..", FilePathSeparator},
		{"../", FilePathSeparator},
		{"./..", FilePathSeparator},
		{"./../", FilePathSeparator},
	}

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

func TestPathErrors(t *testing.T) {
	path := filepath.Join(".", "some", "path")
	path2 := filepath.Join(".", "different", "path")
	fs := &MemMapFs{}
	perm := os.FileMode(0755)

	// relevant functions:
	// func (m *MemMapFs) Chmod(name string, mode os.FileMode) error
	// func (m *MemMapFs) Chtimes(name string, atime time.Time, mtime time.Time) error
	// func (m *MemMapFs) Create(name string) (File, error)
	// func (m *MemMapFs) Mkdir(name string, perm os.FileMode) error
	// func (m *MemMapFs) MkdirAll(path string, perm os.FileMode) error
	// func (m *MemMapFs) Open(name string) (File, error)
	// func (m *MemMapFs) OpenFile(name string, flag int, perm os.FileMode) (File, error)
	// func (m *MemMapFs) Remove(name string) error
	// func (m *MemMapFs) Rename(oldname, newname string) error
	// func (m *MemMapFs) Stat(name string) (os.FileInfo, error)

	err := fs.Chmod(path, perm)
	checkPathError(t, err, "Chmod")

	err = fs.Chtimes(path, time.Now(), time.Now())
	checkPathError(t, err, "Chtimes")

	// fs.Create doesn't return an error

	err = fs.Mkdir(path2, perm)
	if err != nil {
		t.Error(err)
	}
	err = fs.Mkdir(path2, perm)
	checkPathError(t, err, "Mkdir")

	err = fs.MkdirAll(path2, perm)
	if err != nil {
		t.Error("MkdirAll:", err)
	}

	_, err = fs.Open(path)
	checkPathError(t, err, "Open")

	_, err = fs.OpenFile(path, os.O_RDWR, perm)
	checkPathError(t, err, "OpenFile")

	err = fs.Remove(path)
	checkPathError(t, err, "Remove")

	err = fs.RemoveAll(path)
	if err != nil {
		t.Error("RemoveAll:", err)
	}

	err = fs.Rename(path, path2)
	checkPathError(t, err, "Rename")

	_, err = fs.Stat(path)
	checkPathError(t, err, "Stat")
}

func checkPathError(t *testing.T, err error, op string) {
	pathErr, ok := err.(*os.PathError)
	if !ok {
		t.Error(op+":", err, "is not a os.PathError")
		return
	}
	_, ok = pathErr.Err.(*os.PathError)
	if ok {
		t.Error(op+":", err, "contains another os.PathError")
	}
}

// Fails if multiple file objects use the same file.at counter in MemMapFs
func TestMultipleOpenFiles(t *testing.T) {
	defer removeAllTestFiles(t)
	const fileName = "./afero-demo2.txt"

	var fss = []Fs{&OsFs{}, &MemMapFs{}}
	var data = make([][]byte, len(fss))

	for i, fs := range fss {
		dir := testDir(fs)
		path := filepath.Join(dir, fileName)
		fh1, err := fs.Create(path)
		if err != nil {
			t.Error("os.Create failed: " + err.Error())
		}
		_, err = fh1.Write([]byte("test"))
		if err != nil {
			t.Error("fh.Write failed: " + err.Error())
		}
		fh1.Seek(0, os.SEEK_SET)

		fh2, err := fs.OpenFile(path, os.O_RDWR, 0777)
		if err != nil {
			t.Error("fs.OpenFile failed: " + err.Error())
		}
		fh2.Seek(0, os.SEEK_END)
		fh2.Write([]byte("data"))
		fh2.Close()

		fh1.Write([]byte("data"))
		fh1.Close()
		// the file now should contain "datadata"
		data[i], err = ReadFile(fs, path)
		if err != nil {
			t.Error(err)
		}
	}

	for i, fs := range fss {
		if i == 0 {
			continue
		}
		if string(data[0]) != string(data[i]) {
			t.Errorf("OsFs and %s don't behave the same\n"+
				"OsFs: \"%s\"\n%s: \"%s\"\n",
				fs.Name(), data[0], fs.Name(), data[i])
		}
	}
}