package storage

import (
	"bufio"
	"fmt"
	"log"
	"strings"
)

// FormatRequest holds parameters for formatting and mounting a disk.
type FormatRequest struct {
	DevicePath      string      // "/dev/sdb" or "/dev/sdb1"
	MountName       string      // "hdd_1" → mounts at /mnt/hdd_1
	Label           string      // Display label for the UI
	CreatePartition bool        // If true, create a single partition first (wipes disk)
	SetDefault      bool        // Register as default storage path
	Logger          *log.Logger // Optional logger for debug output
	Debug           bool        // Enable debug logging
}

// FormatProgress tracks the formatting/mounting progress.
type FormatProgress struct {
	Step    string // "validating","partitioning","formatting","mounting","permissions","done","error"
	Message string // Human-readable status
	Error   string // Non-empty if Step == "error"
	Percent int    // 0–100
}

// parseRsyncProgress parses a single line of rsync --info=progress2 output.
// Returns (bytesCopied, percent, ok).
func parseRsyncProgress(line string) (int64, int, bool) {
	// Format: "  45,678,901  49%   12.34MB/s    0:00:30"
	scanner := bufio.NewScanner(strings.NewReader(line))
	scanner.Split(bufio.ScanWords)
	var tokens []string
	for scanner.Scan() {
		tokens = append(tokens, scanner.Text())
	}
	if len(tokens) < 2 {
		return 0, 0, false
	}
	bytesStr := strings.ReplaceAll(tokens[0], ",", "")
	var bytesCopied int64
	if _, err := fmt.Sscanf(bytesStr, "%d", &bytesCopied); err != nil {
		return 0, 0, false
	}
	pctStr := strings.TrimSuffix(tokens[1], "%")
	var pct int
	if _, err := fmt.Sscanf(pctStr, "%d", &pct); err != nil {
		return 0, 0, false
	}
	return bytesCopied, pct, true
}