refactor: refactor task logic for better scalability (#76)

* refactor: a big refactor. wip

* refactor: port handle file

* refactor: place all handlers

* fix: task info nil pointer

* feat: enhance task progress tracking and context management

* feat: cancel task

* feat: stream mode

* feat: silent mode

* feat: dir cmd

* refactor: remove unused old file

* feat: rule cmd

* feat: handle silent mode

* feat: batch task

* fix: batch task progress and temp file cleanup

* refactor: update file creation and cleanup methods for better resource management

* feat: add save command with silent mode handling

* feat: message link

* feat: update message prompts to include file count in storage selection

* feat: slient save links

* refactor: reduce dup code

* feat: rule type

* feat: chose dir

* feat: refactor file handling and storage rules, improve error handling and logging

* feat: rule mode

* feat: telegraph pics

* fix: tphpics nil pointer and inaccurate dirpath

* feat: silent save telegraph

* feat: add suffix to avoid file overwrite

* feat: new storage telegram

* chore: tidy go mod

core/tftask/execute.go

@@ -0,0 +1,82 @@
+package tftask
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path"
+	"time"
+
+	"github.com/charmbracelet/log"
+	"github.com/krau/SaveAny-Bot/common/tdler"
+	"github.com/krau/SaveAny-Bot/common/utils/fsutil"
+	"github.com/krau/SaveAny-Bot/config"
+	"github.com/krau/SaveAny-Bot/pkg/enums/key"
+)
+
+func (t *TGFileTask) Execute(ctx context.Context) error {
+	logger := log.FromContext(ctx).WithPrefix(fmt.Sprintf("file[%s]", t.File.Name()))
+	t.Progress.OnStart(ctx, t)
+	if t.stream {
+		return executeStream(ctx, t)
+	}
+
+	logger.Info("Starting file download")
+	localFile, err := fsutil.CreateFile(t.localPath)
+	if err != nil {
+		return fmt.Errorf("failed to create local file: %w", err)
+	}
+	defer func() {
+		if err := localFile.CloseAndRemove(); err != nil {
+			logger.Errorf("Failed to close local file: %v", err)
+		}
+	}()
+	wrAt := newWriterAt(ctx, localFile, t.Progress, t)
+
+	defer func() {
+		t.Progress.OnDone(ctx, t, err)
+	}()
+	_, err = tdler.NewDownloader(t.client, t.File).Parallel(ctx, wrAt)
+	if err != nil {
+		return fmt.Errorf("failed to download file: %w", err)
+	}
+	logger.Infof("File downloaded successfully")
+	if path.Ext(t.File.Name()) == "" {
+		ext := fsutil.DetectFileExt(t.localPath)
+		if ext != "" {
+			t.Path = t.Path + ext
+		}
+	}
+	var fileStat os.FileInfo
+	fileStat, err = os.Stat(t.localPath)
+	if err != nil {
+		return fmt.Errorf("failed to get file stat: %w", err)
+	}
+	vctx := context.WithValue(ctx, key.ContextKeyContentLength, fileStat.Size())
+	for i := range config.Cfg.Retry + 1 {
+		if err = vctx.Err(); err != nil {
+			return fmt.Errorf("context canceled while saving file: %w", err)
+		}
+		var file *os.File
+		file, err = os.Open(t.localPath)
+		if err != nil {
+			return fmt.Errorf("failed to open cache file: %w", err)
+		}
+		defer file.Close()
+		if err = t.Storage.Save(vctx, file, t.Path); err != nil {
+			if i == config.Cfg.Retry {
+				return fmt.Errorf("failed to save file: %w", err)
+			}
+			logger.Errorf("Failed to save file: %s, retrying...", err)
+			select {
+			case <-vctx.Done():
+				return fmt.Errorf("context canceled during retry delay: %w", vctx.Err())
+			case <-time.After(time.Duration(i*500) * time.Millisecond):
+			}
+			continue
+		}
+		return nil
+	}
+	return fmt.Errorf("failed to save file after retries")
+
+}