using System;
using System.Globalization;
using Erp.Platform;
using Volo.Abp.DependencyInjection;
using Volo.Abp.MultiTenancy;
using Volo.Abp.Timing;
using Volo.Abp.Users;

public class DefaultValueHelper : ITransientDependency
{
    private readonly ICurrentUser _currentUser;
    private readonly ICurrentTenant _currentTenant;
    private readonly IClock _clock;
    
    public DefaultValueHelper(
        ICurrentUser currentUser,
        ICurrentTenant currentTenant,
        IClock clock
    )
    {
        _currentUser = currentUser;
        _currentTenant = currentTenant;
        _clock = clock;
    }

    public string GetDefaultValue(string strValue)
    {
        if (string.IsNullOrEmpty(strValue))
        return strValue;

        var now = _clock.Now;

        var result = strValue
            .Replace(PlatformConsts.DefaultValues.UserId, _currentUser.Id?.ToString() ?? Guid.Empty.ToString())
            .Replace(PlatformConsts.DefaultValues.UserName, _currentUser.UserName ?? string.Empty)
            .Replace(PlatformConsts.DefaultValues.Roles, string.Join("','", _currentUser.Roles ?? []))
            .Replace(PlatformConsts.DefaultValues.Now, now.ToString("O", CultureInfo.InvariantCulture))
            .Replace(PlatformConsts.DefaultValues.Day, now.Day.ToString(CultureInfo.InvariantCulture))
            .Replace(PlatformConsts.DefaultValues.Month, now.Month.ToString(CultureInfo.InvariantCulture))
            .Replace(PlatformConsts.DefaultValues.Year, now.Year.ToString(CultureInfo.InvariantCulture));

        // 🔹 TenantId özel durumu: NULL => IS NULL, varsa => = 'GUID'
        if (_currentTenant?.Id.HasValue == true)
        {
            result = result.Replace(
                $"= '{PlatformConsts.DefaultValues.TenantId}'",
                $"= '{_currentTenant.Id}'"
            ).Replace(
                PlatformConsts.DefaultValues.TenantId,
                _currentTenant.Id.ToString()
            );
        }
        else
        {
            result = result.Replace(
                $"= '{PlatformConsts.DefaultValues.TenantId}'",
                "IS NULL"
            ).Replace(
                PlatformConsts.DefaultValues.TenantId,
                "NULL"
            );
        }

        return result;
    }
}