package server

import (
	"errors"
	"fmt"
	"strconv"
	"strings"
	"time"
)

func parseOptionalInt64(raw string) (*int64, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil, nil
	}
	value, err := strconv.ParseInt(raw, 10, 64)
	if err != nil {
		return nil, errors.New("must be an integer")
	}
	if value < 0 {
		return nil, errors.New("must be at least 0")
	}
	return &value, nil
}

func parseCSVInt64(raw string) ([]int64, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil, nil
	}
	parts := strings.Split(raw, ",")
	values := make([]int64, 0, len(parts))
	for _, part := range parts {
		part = strings.TrimSpace(part)
		if part == "" {
			continue
		}
		value, err := strconv.ParseInt(part, 10, 64)
		if err != nil {
			return nil, fmt.Errorf("allowed expiry durations must be comma-separated seconds")
		}
		if value < 0 {
			return nil, fmt.Errorf("allowed expiry durations must be at least 0")
		}
		values = append(values, value)
	}
	return values, nil
}

func optionalInt64Label(value *int64) string {
	if value == nil {
		return "-"
	}
	return strconv.FormatInt(*value, 10)
}

func joinInt64s(values []int64) string {
	if len(values) == 0 {
		return "-"
	}
	parts := make([]string, 0, len(values))
	for _, value := range values {
		parts = append(parts, strconv.FormatInt(value, 10))
	}
	return strings.Join(parts, ", ")
}

func formatAdminTime(value time.Time) string {
	if value.IsZero() {
		return "-"
	}
	return value.Local().Format("2006-01-02 15:04:05")
}