package backup

import (
    "fmt"
    "io"
    "net"
    "os"

    "github.com/hirochachacha/go-smb2"
)

// SMBClient wraps the SMB client and session
type SMBClient struct {
    Share   string
    Session *smb2.Session
}

// NewSMBClient initializes and returns a new SMB client
func NewSMBClient(server, user, pass, domain, share string) (*SMBClient, error) {
    conn, err := net.Dial("tcp", server)
    if err != nil {
        return nil, fmt.Errorf("failed to dial: %v", err)
    }
    defer conn.Close()

    d := &smb2.Dialer{
        Initiator: &smb2.NTLMInitiator{
            User:     user,
            Password: pass,
            Domain:   domain,
        },
    }

    session, err := d.Dial(conn)
    if err != nil {
        return nil, fmt.Errorf("failed to start SMB session: %v", err)
    }

    return &SMBClient{
        Share:   share,
        Session: session,
    }, nil
}

// UploadFile uploads a file to the specified SMB share
func (c *SMBClient) UploadFile(remotePath, localPath string) error {
    fs, err := c.Session.Mount(c.Share)
    if err != nil {
        return fmt.Errorf("failed to mount share: %v", err)
    }
    defer fs.Umount()

    localFile, err := os.Open(localPath)
    if err != nil {
        return fmt.Errorf("failed to open local file: %v", err)
    }
    defer localFile.Close()

    remoteFile, err := fs.Create(remotePath)
    if err != nil {
        return fmt.Errorf("failed to create remote file: %v", err)
    }
    defer remoteFile.Close()

    _, err = io.Copy(remoteFile, localFile)
    if err != nil {
        return fmt.Errorf("failed to write to remote file: %v", err)
    }

    return nil
}

// DeleteFile deletes a file from the specified SMB share
func (c *SMBClient) DeleteFile(remotePath string) error {
    fs, err := c.Session.Mount(c.Share)
    if err != nil {
        return fmt.Errorf("failed to mount share: %v", err)
    }
    defer fs.Umount()

    err = fs.Remove(remotePath)
    if err != nil {
        return fmt.Errorf("failed to delete remote file: %v", err)
    }

    return nil
}

// ListFiles lists all files (backups) in the specified SMB share
func (c *SMBClient) ListFiles(remoteDir string) ([]string, error) {
    fs, err := c.Session.Mount(c.Share)
    if err != nil {
        return nil, fmt.Errorf("failed to mount share: %v", err)
    }
    defer fs.Umount()

    entries, err := fs.ReadDir(remoteDir)
    if err != nil {
        return nil, fmt.Errorf("failed to read directory: %v", err)
    }

    var files []string
    for _, entry := range entries {
        if !entry.IsDir() {
            files = append(files, entry.Name())
        }
    }

    return files, nil
}

// SetShare sets the SMB share for the client
func (c *SMBClient) SetShare(share string) {
    c.Share = share
}