package swampfile

import (
	"time"
	"os"
	"path"
	"caj-larsson/bog/dataswamp/swampfile"
)

type FileSystemSwampFileData struct {
	path string
	size int64
	mod_time time.Time
	file *os.File
}

func (f FileSystemSwampFileData) Read(p []byte) (int, error) {
	return f.file.Read(p)
}

func (f FileSystemSwampFileData) Write(p []byte) (int, error) {
	return f.file.Write(p)
}

func (f FileSystemSwampFileData) Close() error {
	return f.file.Close()
}

func (f FileSystemSwampFileData) Seek(offset int64, whence int) (int64, error) {
	return f.file.Seek(offset, whence)
}

func (f FileSystemSwampFileData) Path() string {
	return f.path
}

func (f FileSystemSwampFileData) Size() int64 {
	return f.size
}

func (f FileSystemSwampFileData) Modified() time.Time{
	return time.Now()
}

type Repository struct {
	Root string
}

func (f Repository) absPath(filename string, namespace_ns string) string {
	return path.Join(f.Root, namespace_ns, filename)
}

func (f Repository) Create(filename string, namespace_ns string) (swampfile.SwampInFile, error) {
	abs_path := f.absPath(filename, namespace_ns)

	dir := path.Dir(abs_path)
	os.MkdirAll(dir, 0750)
	file, err := os.OpenFile(abs_path, os.O_RDWR|os.O_CREATE, 0644)

	if err != nil {
		panic(err)
	}

	stat_info, err := file.Stat()
	if err != nil {
		panic(err)
	}

	bfd := FileSystemSwampFileData {filename, stat_info.Size(), stat_info.ModTime(), file}

	return bfd, nil
}

func (f Repository) Open(filename string, namespace_ns string) (swampfile.SwampOutFile, error) {
	abs_path := f.absPath(filename, namespace_ns)

	dir := path.Dir(abs_path)
	os.MkdirAll(dir, 0750)
	file, err := os.OpenFile(abs_path, os.O_RDONLY, 0644)

	if err != nil {
		return nil, swampfile.ErrNotExists
	}

	bfd := FileSystemSwampFileData {filename, 0, time.Now(), file}

	return bfd, nil
}

func (f Repository) Delete(filename string, namespace_ns string) {
	abs_path := f.absPath(filename, namespace_ns)
	os.Remove(abs_path)
}