package repair

import (
	"fmt"
	"github.com/sirrobot01/decypharr/pkg/arr"
	"os"
	"path/filepath"
)

func fileIsSymlinked(file string) bool {
	info, err := os.Lstat(file)
	if err != nil {
		return false
	}
	return info.Mode()&os.ModeSymlink != 0
}

func getSymlinkTarget(file string) string {
	if fileIsSymlinked(file) {
		target, err := os.Readlink(file)
		if err != nil {
			return ""
		}
		if !filepath.IsAbs(target) {
			dir := filepath.Dir(file)
			target = filepath.Join(dir, target)
		}
		return target
	}
	return ""
}

func fileIsReadable(filePath string) error {
	// First check if file exists and is accessible
	info, err := os.Stat(filePath)
	if err != nil {
		return err
	}

	// Check if it's a regular file
	if !info.Mode().IsRegular() {
		return fmt.Errorf("not a regular file")
	}

	// Try to read the first 1024 bytes
	err = checkFileStart(filePath)
	if err != nil {
		return err
	}

	return nil
}

func checkFileStart(filePath string) error {
	f, err := os.Open(filePath)
	if err != nil {
		return err
	}
	defer f.Close()
	// Read first 1kb
	buffer := make([]byte, 1024)
	_, err = f.Read(buffer)
	if err != nil {
		return err
	}
	return nil
}

func collectFiles(media arr.Content) map[string][]arr.ContentFile {
	uniqueParents := make(map[string][]arr.ContentFile)
	files := media.Files
	for _, file := range files {
		target := getSymlinkTarget(file.Path)
		if target != "" {
			file.IsSymlink = true
			dir, f := filepath.Split(target)
			torrentNamePath := filepath.Clean(dir)
			// Set target path folder/file.mkv
			file.TargetPath = f
			uniqueParents[torrentNamePath] = append(uniqueParents[torrentNamePath], file)
		}
	}
	return uniqueParents
}