// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package resource

import (
	"context"
	_ "encoding/json"
	"fmt"
	"github.com/stretchr/testify/assert"
	"gopkg.in/yaml.v3"
	"io"
	_ "log"
	_ "net/http"
	_ "net/http/httptest"
	_ "net/url"
	"os"
	"path/filepath"
	"strings"
	"syscall"
	"testing"
	"time"
	"os/user"
	"io/fs"
	"decl/internal/codec"
	"decl/internal/data"
	"log/slog"
)

func TestNewFileResource(t *testing.T) {
	f := NewFile()
	assert.NotEqual(t, nil, f)
}

func TestNewFileNormalized(t *testing.T) {
	file := fmt.Sprintf("%s/%s", TempDir, "bar/../fooread.txt")
	absFilePath,_ := filepath.Abs(file)
	f := NewNormalizedFile()
	assert.NotNil(t, f)
	assert.Nil(t, f.SetURI("file://" + file))

	assert.NotEqual(t, file, f.Path)
	assert.Equal(t, absFilePath, f.Path)

	assert.NotEqual(t, "file://" + file, f.URI())
	assert.Equal(t, "file://" + absFilePath, f.URI())
}

func TestApplyResourceTransformation(t *testing.T) {
	f := NewFile()
	assert.NotEqual(t, nil, f)

	//e := f.Apply()
	//assert.Equal(t, nil, e)
}

func TestReadFile(t *testing.T) {
	ctx := context.Background()
	file, _ := filepath.Abs(filepath.Join(TempDir, "fooread.txt"))

	expectedTime, timeErr := time.Parse(time.RFC3339Nano, "2001-12-15T01:01:01.000000001Z")
	assert.Nil(t, timeErr)
	expectedTimestamp := expectedTime.Local().Format(time.RFC3339Nano)

	declarationAttributes := `
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  atime: %s
  ctime: %s
  mtime: %s
  content: |-
    test line 1
    test line 2
  sha256: f2082f984f1bf1a7886e2af32ccc9ca474fbff3553d131204b070c438114dd51
  size: 23
  filetype: "regular"
  state: present
`

	decl := fmt.Sprintf(declarationAttributes, file, ProcessTestUserName, ProcessTestGroupName, expectedTimestamp, expectedTimestamp, expectedTimestamp)

	testFile := NewFile()
	e := testFile.LoadDecl(decl)
	assert.Nil(t, e)
	applyErr := testFile.Apply()
	assert.Nil(t, applyErr)

	f := NewFile()
	assert.NotEqual(t, nil, f)

	f.Path = file
	r, e := f.Read(ctx)
	assert.Nil(t, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)

	info, statErr := os.Stat(file)
	assert.Nil(t, statErr)
	stat, ok := info.Sys().(*syscall.Stat_t)
	assert.True(t, ok)
	cTime := time.Unix(int64(stat.Ctim.Sec), int64(stat.Ctim.Nsec))

	expected := fmt.Sprintf(declarationAttributes, file, ProcessTestUserName, ProcessTestGroupName, expectedTimestamp, cTime.Local().Format(time.RFC3339Nano), expectedTimestamp)
	assert.YAMLEq(t, expected, string(r))
}

func TestUseConfig(t *testing.T) {
	
	file, _ := filepath.Abs(filepath.Join(TempDir, "missingfile.txt"))

	f := NewFile()
	assert.NotNil(t, f)
	f.UseConfig(MockConfig(func(key string) (any, error) {
		if key == "prefix" {
			return "/tmp", nil
		}
		return nil, data.ErrUnknownConfigurationKey
	}))

	assert.Nil(t, f.SetURI(fmt.Sprintf("file://%s", file)))
	assert.Equal(t, filepath.Join("/tmp", file), f.FilePath())
}

func TestReadFileError(t *testing.T) {
	ctx := context.Background()
	file, _ := filepath.Abs(filepath.Join(TempDir, "missingfile.txt"))

	f := NewFile()
	assert.NotNil(t, f)
	f.Path = file
	_, e := f.Read(ctx)
	assert.ErrorIs(t, e, fs.ErrNotExist)
	assert.Equal(t, "absent", f.State)
}

func TestCreateFile(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "foo.txt"))

	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  content: |-
    test line 1
    test line 2
  state: present
`, file, ProcessTestUserName, ProcessTestGroupName)

	f := NewFile()
	e := f.LoadDecl(decl)
	assert.Nil(t, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)

	applyErr := f.Apply()
	assert.Equal(t, nil, applyErr)
	assert.FileExists(t, file, nil)
	s, e := os.Stat(file)
	assert.Equal(t, nil, e)

	assert.Greater(t, s.Size(), int64(0))

	f.State = "absent"
	assert.Nil(t, f.Apply())
	assert.NoFileExists(t, file, nil)
}

func TestLoadFile(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "foo.txt"))

	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  content: |-
    test line 1
    test line 2
  state: present
`, file, ProcessTestUserName, ProcessTestGroupName)

	f := NewFile()
	assert.Nil(t, f.Load([]byte(decl), codec.FormatYaml))
	assert.Equal(t, ProcessTestUserName, f.Owner)
	assert.Greater(t, f.Size, int64(0))

	reader := io.NopCloser(strings.NewReader(decl))
	fr := NewFile()
	assert.Nil(t, fr.LoadReader(reader, codec.FormatYaml))
	assert.Equal(t, ProcessTestUserName, f.Owner)
	assert.Greater(t, f.Size, int64(0))

	contentReaderTransport, trErr := fr.ContentReaderStream()
	assert.ErrorContains(t, trErr, "Cannot provide transport reader for string content")
	assert.Nil(t, contentReaderTransport)

	contentWriterTransport, trErr := fr.ContentWriterStream()
	assert.ErrorContains(t, trErr, "Cannot provide transport writer for string content")
	assert.Nil(t, contentWriterTransport)
}

func TestFileType(t *testing.T) {
	fileType := []byte(`
filetype: "directory"
`)
	var testFile File
	err := yaml.Unmarshal(fileType, &testFile)
	assert.Nil(t, err)

}

func TestFileDirectory(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "testdir"))

	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0700"
  filetype: "directory"
  state: present
`, file, ProcessTestUserName, ProcessTestGroupName)

	f := NewFile()
	e := f.LoadDecl(decl)
	assert.Equal(t, nil, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)

	applyErr := f.Apply()
	assert.Equal(t, nil, applyErr)
	assert.DirExists(t, file)

	f.State = "absent"
	deleteErr := f.Apply()
	assert.Nil(t, deleteErr)
	assert.NoDirExists(t, file)
}

func TestFileTimes(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "testtimes.txt"))
	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mtime: 2001-12-15T01:01:01.1Z
  mode: "0600"
  filtetype: "regular"
  state: "present"
`, file, ProcessTestUserName, ProcessTestGroupName)

	expectedTime, timeErr := time.Parse(time.RFC3339, "2001-12-15T01:01:01.1Z")
	assert.Nil(t, timeErr)

	f := NewFile()
	e := f.LoadDecl(decl)
	assert.Nil(t, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)
	assert.True(t, f.Mtime.Equal(expectedTime))
}

func TestFileSetURI(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "testuri.txt"))
	f := NewFile()
	assert.NotNil(t, f)
	e := f.SetURI("file://" + file)
	assert.Nil(t, e)
	assert.Equal(t, "file", f.Type())
	assert.Equal(t, file, f.Path)
}

func TestFileNormalizePath(t *testing.T) {
	absFile, absFilePathErr := filepath.Abs(filepath.Join(TempDir, "./testuri.txt"))
	assert.Nil(t, absFilePathErr)

	file := filepath.Join(TempDir, "./testuri.txt")

	f := NewFile()
	assert.NotNil(t, f)

	f.Path = file
	e := f.NormalizePath()
	assert.Nil(t, e)

	assert.Equal(t, absFile, f.Path)
}

func TestFileUpdateAttributesFromFileInfo(t *testing.T) {
	f := NewFile()
	assert.NotNil(t, f)

	info, e := os.Lstat(TempDir)
	assert.Nil(t, e)

	updateAttributesErr := f.UpdateAttributesFromFileInfo(info)
	assert.Nil(t, updateAttributesErr)
	assert.Equal(t, DirectoryFile, f.FileType)

	assert.ErrorIs(t, f.SetFileInfo(nil), ErrInvalidFileInfo)
	
}

func TestFileReadStat(t *testing.T) {
	ctx := context.Background()
	link := filepath.Join(TempDir, "link.txt")
	linkTargetFile := filepath.Join(TempDir, "testuri.txt")

	f := NewFile()
	assert.NotNil(t, f)

	f.Path = linkTargetFile
	e := f.NormalizePath()
	assert.Nil(t, e)

	statErr := f.ReadStat()
	assert.Error(t, statErr)

	f.Owner = ProcessTestUserName
	f.Group = ProcessTestGroupName
	f.State = "present"
	assert.Nil(t, f.Apply())

	assert.Nil(t, f.ReadStat())

	l := NewFile()
	assert.NotNil(t, l)

	assert.Nil(t, l.NormalizePath())
	l.FileType = SymbolicLinkFile
	l.Path = link
	l.Target = linkTargetFile
	l.State = "present"

	slog.Info("TestFileReadStat()", "file", f, "link", l)

	applyErr := l.Apply()
	assert.Nil(t, applyErr)
	readStatErr := l.ReadStat()
	assert.Nil(t, readStatErr)

	testRead := NewFile()
	testRead.Path = link
	_,testReadErr := testRead.Read(ctx)
	assert.Nil(t, testReadErr)
	assert.Equal(t, linkTargetFile, testRead.Target)
}

func TestFileResourceFileInfo(t *testing.T) {
	testFile := filepath.Join(TempDir, "testuri.txt")

	f := NewFile()
	assert.NotNil(t, f)

	f.Path = testFile
	f.Mode = "0600"
	f.Content = "some test data"
	f.State = "present"
	assert.Nil(t, f.Apply())

	_, readErr := f.Read(context.Background())
	assert.Nil(t, readErr)

	fi := f.FileInfo()
	assert.Equal(t, os.FileMode(0600), fi.Mode().Perm())
	assert.Equal(t, testFile, fi.Name())
	assert.False(t, fi.IsDir())
	assert.Nil(t, fi.Sys())
	assert.Greater(t, time.Now(), fi.ModTime())
	assert.Greater(t, fi.Size(), int64(0))
}

func TestFileClone(t *testing.T) {
	ctx := context.Background()
	testFile := filepath.Join(TempDir, "testorig.txt")
	testCloneFile := filepath.Join(TempDir, "testclone.txt")

	f := NewFile()
	assert.NotNil(t, f)

	f.Path = testFile
	f.Mode = "0600"
	f.State = "present"
	assert.Nil(t, f.Apply())
	
	_,readErr := f.Read(ctx)
	assert.Nil(t, readErr)

	time.Sleep(100 * time.Millisecond)

	clone := f.Clone().(*File)
	assert.Equal(t, f, clone)
	clone.Mtime = time.Time{}
	clone.Path = testCloneFile
	assert.Nil(t, clone.Apply())

	_,updateReadErr := f.Read(ctx)
	assert.Nil(t, updateReadErr)

	_, cloneReadErr := clone.Read(ctx)
	assert.Nil(t, cloneReadErr)

	fmt.Printf("file %#v\nclone %#v\n", f, clone) 
	assert.NotEqual(t, f.Mtime, clone.Mtime)
}

func TestFileErrors(t *testing.T) {
	//ctx := context.Background()
	testFile := filepath.Join(TempDir, "testerr.txt")

	f := NewFile()
	assert.NotNil(t, f)
	stater := f.StateMachine()

	f.Path = testFile
	f.Mode = "631"
	assert.Nil(t, stater.Trigger("create"))
	
	read := NewFile()
	readStater := read.StateMachine()
	read.Path = testFile
	assert.Nil(t, readStater.Trigger("read"))
	assert.Equal(t, FileMode("0631"), read.Mode)

	f.Mode = "900"
	assert.ErrorAs(t, stater.Trigger("create"), &ErrInvalidFileMode, "Apply should fail with NumError when converting invalid octal")
	
	assert.Nil(t, readStater.Trigger("read"))
	assert.Equal(t, FileMode("0631"), read.Mode)

	f.Mode = "0631"
	f.Owner = "bar"
	uidErr := f.Apply()
	var UnknownUser user.UnknownUserError
	assert.Error(t, uidErr, UnknownUser)
	
}

func TestFileDelete(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "foo.txt"))

	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  content: |-
    test line 1
    test line 2
  state: present
`, file, ProcessTestUserName, ProcessTestGroupName)

	f := NewFile()
	stater := f.StateMachine()
	e := f.LoadDecl(decl)
	assert.Nil(t, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)

	assert.Nil(t, stater.Trigger("create"))
	assert.FileExists(t, file, nil)
	s, e := os.Stat(file)
	assert.Nil(t, e)

	assert.Greater(t, s.Size(), int64(0))

	assert.Nil(t, stater.Trigger("delete"))
	assert.NoFileExists(t, file, nil)
}

func TestFileContentRef(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "src.txt"))
	copyFile, _ := filepath.Abs(filepath.Join(TempDir, "copy.txt"))
	
	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  content: |-
    test line 1
    test line 2
  state: present
`, file, ProcessTestUserName, ProcessTestGroupName)

	contentRef := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  sourceref: "file://%s"
  state: present
`, file, ProcessTestUserName, ProcessTestGroupName, copyFile)

	f := NewFile()
	stater := f.StateMachine()
	e := f.LoadDecl(decl)
	assert.Nil(t, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)

	assert.Nil(t, stater.Trigger("create"))
	assert.FileExists(t, file, nil)
	s, e := os.Stat(file)
	assert.Nil(t, e)

	assert.Greater(t, s.Size(), int64(0))

	fr := NewFile()
	loadErr := fr.LoadDecl(contentRef)
	assert.Nil(t, loadErr)
	assert.Equal(t, ProcessTestUserName, fr.Owner)

	assert.Nil(t, fr.StateMachine().Trigger("create"))
	assert.FileExists(t, file, nil)
	_, statErr := os.Stat(file)
	assert.Nil(t, statErr)
	
	assert.Nil(t, stater.Trigger("delete"))
	assert.NoFileExists(t, file, nil)
}

func TestFilePathURI(t *testing.T) {
//	file, _ := filepath.Abs(filepath.Join(TempDir, "foo.txt"))

	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  content: |-
    test line 1
    test line 2
`, "", ProcessTestUserName, ProcessTestGroupName)

	f := NewFile()
	e := f.LoadDecl(decl)
	assert.Nil(t, e)
	assert.Equal(t, "", f.FilePath())
	assert.ErrorContains(t, f.Validate(), "path: String length must be greater than or equal to 1")
}

func TestFileAbsent(t *testing.T) {
	file, _ := filepath.Abs(filepath.Join(TempDir, "testabsentstate.txt"))

	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  filetype: "regular"
`, file, ProcessTestUserName, ProcessTestGroupName)

	f := NewFile()
	stater := f.StateMachine()
	e := f.LoadDecl(decl)
	assert.Nil(t, e)
	assert.Equal(t, ProcessTestUserName, f.Owner)

	err := stater.Trigger("read")
	assert.Nil(t, err)

	assert.Equal(t, "absent", f.State)

}

func TestFileReader(t *testing.T) {
	expected := "datatoreadusinganio.readers"
	dataReader := strings.NewReader(expected)
	file, _ := filepath.Abs(filepath.Join(TempDir, "testabsentstate.txt"))
	decl := fmt.Sprintf(`
  path: "%s"
  owner: "%s"
  group: "%s"
  mode: "0600"
  content: "%s"
  filetype: "regular"
`, file, ProcessTestUserName, ProcessTestGroupName, expected)

	f := NewFile()
	assert.Nil(t, f.LoadString(decl, codec.FormatYaml))
	assert.Nil(t, f.SetContent(dataReader))
	reader, err := f.GetContent(nil)
	assert.Nil(t, err)
	value, ioErr := io.ReadAll(reader)
	assert.Nil(t, ioErr)
	assert.Equal(t, expected, string(value))

	var writer strings.Builder
	_, writerErr := f.GetContent(&writer)
	assert.Nil(t, writerErr)
	assert.Equal(t, expected, writer.String())
}

func TestFileSetURIError(t *testing.T) {
	file := fmt.Sprintf("%s/%s", TempDir, "fooread.txt")
	f := NewFile()
	assert.NotNil(t, f)
	e := f.SetURI("foo://" + file)
	assert.NotNil(t, e)
	assert.ErrorIs(t, e, ErrInvalidResourceURI)
}

func TestFileContentType(t *testing.T) {
	file := fmt.Sprintf("%s/%s", TempDir, "fooread.txt")
	f := NewFile()
	assert.NotNil(t, f)
	e := f.SetURI("file://" + file)
	assert.Nil(t, e)
	assert.Equal(t, "txt", f.ContentType())
}