using Fake.Application;
using Oms.Domain.CustomersAggregate.Entities;

namespace Oms.Application.Shared;

/// <summary>
/// 客户联系方式完整度（下单/揽收前必填手机+邮箱）。
/// </summary>
public static class CustomerContactHelper
{
    public const string ContactRequiredMessage = "请先完善手机号和邮箱后再下单";

    public static bool HasPhone(Customer? customer) =>
        !string.IsNullOrWhiteSpace(customer?.Phone);

    public static bool HasEmail(Customer? customer) =>
        !string.IsNullOrWhiteSpace(customer?.Email);

    public static bool NeedsContact(Customer? customer) =>
        customer == null || !HasPhone(customer) || !HasEmail(customer);

    public static void EnsureContactComplete(Customer? customer)
    {
        if (NeedsContact(customer))
        {
            throw new BusinessException(ContactRequiredMessage);
        }
    }

    public static string? NormalizeOptionalContact(string? value)
    {
        var trimmed = value?.Trim();
        if (string.IsNullOrWhiteSpace(trimmed)) return null;
        // 前端/第三方有时会把缺失值以字符串形式传过来（如 "null" / "undefined"）
        // 这类值应按“未填写”处理，否则会误触发“已被占用”校验。
        if (trimmed.Equals("null", StringComparison.OrdinalIgnoreCase)) return null;
        if (trimmed.Equals("undefined", StringComparison.OrdinalIgnoreCase)) return null;
        return trimmed;
    }

    /// <summary>
    /// RBAC <c>user.Email</c> 有唯一索引，空串会撞库。
    /// 无真实邮箱时用客户编号生成占位，禁止写入 <c>''</c>。
    /// </summary>
    public static string ResolveRbacEmailOrPlaceholder(string? email, string customerCode)
    {
        var normalized = NormalizeOptionalContact(email);
        if (normalized != null)
        {
            return normalized;
        }

        var code = (customerCode ?? string.Empty).Trim().ToLowerInvariant();
        if (string.IsNullOrEmpty(code))
        {
            code = Guid.NewGuid().ToString("N")[..12];
        }

        return $"{code}@noemail.local";
    }

    public static bool IsPlaceholderRbacEmail(string? email)
    {
        var value = email?.Trim();
        return !string.IsNullOrEmpty(value)
               && value.EndsWith("@noemail.local", StringComparison.OrdinalIgnoreCase);
    }
}