package util

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"time"

	"github.com/klauspost/compress/zstd"
	"github.com/minio/minio-go/v7"
)

func ExpandShellString(s string) (string, error) {
	if strings.Contains(s, "$") {
		// Start a shell to expand the environment variables
		cmd := exec.Command("sh", "-c", "echo "+s)
		out, err := cmd.Output()
		if err != nil {
			return "", err
		}
		s = strings.TrimSpace(string(out))
	}
	return s, nil
}

func ExpandShellStringInfallible(s string) string {
	expanded, err := ExpandShellString(s)
	if err != nil {
		return s
	}
	return expanded
}

func DecompressZstdBuffer(input []byte) ([]byte, error) {
	decoder, err := zstd.NewReader(nil)
	if err != nil {
		return nil, err
	}
	defer decoder.Close()
	return decoder.DecodeAll(input, nil)
}

func FmtMyTime(t time.Time) string {
	return t.Format("2006-01-02 15:04:05.000")
}

func FmtMyDate(t time.Time) string {
	return t.Format("2006-01-02")
}

func LastElem[T any](s []T) T {
	return s[len(s)-1]
}

func MinioUploadFolder(minioClient *minio.Client, bucketName string, objPath string, localPath string) error {
	// Walk the local folder
	err := filepath.WalkDir(localPath, func(path string, d os.DirEntry, err error) error {
		if err != nil {
			return fmt.Errorf("walk dir failed: %w", err)
		}

		if d.IsDir() {
			return nil
		}

		relPath, err := filepath.Rel(localPath, path)
		if err != nil {
			return fmt.Errorf("get relative path failed: %w", err)
		}

		targetPath := filepath.Join(objPath, relPath)
		_, err = minioClient.FPutObject(context.Background(), bucketName, targetPath, path,
			minio.PutObjectOptions{ContentType: "application/octet-stream"})
		if err != nil {
			return fmt.Errorf("fput object failed: %w", err)
		}

		return nil
	})
	return err
}

func GetCurrentNanoTimestampUTC() int64 {
	return time.Now().UnixNano()
}

func ExtractNumberFromString(filename string) (int64, error) {
	re := regexp.MustCompile(`(\d+)`)
	match := re.FindStringSubmatch(filename)
	if len(match) < 2 {
		return 0, fmt.Errorf("number not found in filename `%s`", filename)
	}
	return strconv.ParseInt(match[1], 10, 64)
}