package operator

import (
	"io"
	"net/http"
	"path"
	"strconv"

	"mstore/app/descr"
	"mstore/pkg/auxtool"
	"mstore/pkg/auxuuid"
)

// File exists
type FileExistsParams struct {
	Filepath string
	Source   string
	Dest     string
}
type FileExistsResult struct {
	Descr *descr.File
}

func (oper *Operator) FileExists(param *FileExistsParams) (int, *FileExistsResult, error) {
	var err error
	code := http.StatusNotFound
	res := &FileExistsResult{}

	filename := path.Base(param.Filepath)
	collection := path.Dir(param.Filepath)

	exist, file, err := oper.mdb.GetFileByCollection(collection, filename)
	if exist {
		code = http.StatusOK
		res.Descr = file
	}
	return code, res, err
}

// Put file
type PutFileParams struct {
	ContentType   string
	ContentLength string
	Filepath      string
	Source        io.ReadCloser
}
type PutFileResult struct {
	Descr *descr.File
}

const defaultContentType = "application/octet-stream"

func (oper *Operator) PutFile(param *PutFileParams) (int, *PutFileResult, error) {
	var err error
	res := &PutFileResult{}

	size, err := strconv.ParseInt(param.ContentLength, 10, 64)
	if err != nil {
		code := http.StatusLengthRequired
		return code, res, err
	}
	contentType := param.ContentType
	if contentType == "" {
		contentType = defaultContentType
	}

	filename := path.Base(param.Filepath)
	collection := path.Dir(param.Filepath)
	oper.logg.Debugf("Put file %s %s", collection, filename)

	tmpname, size, checksum, err := oper.store.WriteTempFile(param.Source)
	if err != nil {
		code := http.StatusInternalServerError
		return code, res, err
	}

	exists, fileDescr, err := oper.mdb.GetFileByCollection(collection, filename)
	if err != nil {
		code := http.StatusInternalServerError
		return code, res, err
	}

	now := auxtool.TimeNow()
	if exists {
		fileDescr.Size = size
		fileDescr.Checksum = checksum
		fileDescr.UpdatedAt = now
		fileDescr.Type = contentType
		err = oper.mdb.UpdateFileByID(fileDescr.ID, fileDescr)
		if err != nil {
			code := http.StatusInternalServerError
			return code, res, err
		}
	} else {
		fileDescr = &descr.File{
			ID:         auxuuid.NewUUID(),
			Name:       filename,
			Collection: collection,
			Size:       size,
			Type:       contentType,
			Checksum:   checksum,
			CreatedAt:  now,
			UpdatedAt:  now,
		}
		err = oper.mdb.InsertFile(fileDescr)
		if err != nil {
			code := http.StatusInternalServerError
			return code, res, err
		}
	}

	err = oper.store.LinkFile(tmpname, collection, filename)
	if err != nil {
		code := http.StatusInternalServerError
		return code, res, err
	}

	res.Descr = fileDescr
	code := http.StatusOK
	return code, res, err
}

// Get file
type GetFileParams struct {
	Filepath string
}
type GetFileResult struct {
	ContentType   string
	ContentLength string
	Source        io.ReadCloser
}

func (oper *Operator) GetFile(param *GetFileParams) (int, *GetFileResult, error) {
	var err error
	res := &GetFileResult{}
	code := http.StatusOK
	return code, res, err
}

// Delete file
type DeleteFileParams struct {
	Filepath string
}
type DeleteFileResult struct{}

func (oper *Operator) DeleteFile(param *DeleteFileParams) (int, *DeleteFileResult, error) {
	var err error
	res := &DeleteFileResult{}
	code := http.StatusOK
	return code, res, err
}