package agent

import (
	"fmt"
	"strconv"
	"strings"
)

func isEmmcBlockName(name string) bool {
	if !strings.HasPrefix(name, "mmcblk") {
		return false
	}
	suffix := strings.TrimPrefix(name, "mmcblk")
	if suffix == "" {
		return false
	}
	for _, c := range suffix {
		if c < '0' || c > '9' {
			return false
		}
	}
	return true
}

func parseHexOrDecByte(s string) (uint8, bool) {
	s = strings.TrimSpace(s)
	if s == "" {
		return 0, false
	}
	base := 10
	if strings.HasPrefix(s, "0x") || strings.HasPrefix(s, "0X") {
		base = 16
		s = s[2:]
	}
	parsed, err := strconv.ParseUint(s, base, 8)
	if err != nil {
		return 0, false
	}
	return uint8(parsed), true
}

func parseHexBytePair(s string) (uint8, uint8, bool) {
	fields := strings.Fields(s)
	if len(fields) < 2 {
		return 0, 0, false
	}
	a, okA := parseHexOrDecByte(fields[0])
	b, okB := parseHexOrDecByte(fields[1])
	if !okA && !okB {
		return 0, 0, false
	}
	return a, b, true
}

func emmcSmartStatus(preEOL uint8) string {
	switch preEOL {
	case 0x01:
		return "PASSED"
	case 0x02:
		return "WARNING"
	case 0x03:
		return "FAILED"
	default:
		return "UNKNOWN"
	}
}

func emmcPreEOLString(preEOL uint8) string {
	switch preEOL {
	case 0x01:
		return "0x01 (normal)"
	case 0x02:
		return "0x02 (warning)"
	case 0x03:
		return "0x03 (urgent)"
	default:
		return fmt.Sprintf("0x%02x", preEOL)
	}
}

func emmcLifeTimeString(v uint8) string {
	// JEDEC eMMC: 0x01..0x0A => 0-100% used in 10% steps, 0x0B => exceeded.
	switch {
	case v == 0:
		return "0x00 (not reported)"
	case v >= 0x01 && v <= 0x0A:
		low := int(v-1) * 10
		high := int(v) * 10
		return fmt.Sprintf("0x%02x (%d-%d%% used)", v, low, high)
	case v == 0x0B:
		return "0x0b (>100% used)"
	default:
		return fmt.Sprintf("0x%02x", v)
	}
}