using Easy.DDD.Domain.Entities;
using Identity.Api.Clean.Shared.Consts;
using System.Collections.ObjectModel;

namespace Identity.Api.Clean.Domain.Entites;

public class OrganizationUnit : AggregateRoot<Guid>
{
    public virtual Guid? TenantId { get; protected set; }


    /// <summary>
    /// 父 <see cref="OrganizationUnit"/> Id.
    /// Null，如果此 OU 是根。
    /// </summary>
    public virtual Guid? ParentId { get; internal set; }

    /// <summary>
    /// 此组织单位的层次代码。
    /// 示例：“00001.00042.00005”。
    /// 这是组织单位的唯一代码。
    /// 如果OU层次结构改变，它是可变的。
    /// </summary>
    public virtual string Code { get; internal set; }

    /// <summary>
    /// 此组织单位的显示名称。
    /// </summary>
    public virtual string DisplayName { get; set; }

    /// <summary>
    /// 此 OU 的角色。
    /// </summary>
    public virtual ICollection<OrganizationUnitRole> Roles { get; protected set; }

    /// <summary>
    /// Initializes a new instance of the <see cref="OrganizationUnit"/> class.
    /// </summary>
    public OrganizationUnit()
    {

    }

    /// <summary>
    /// Initializes a new instance of the <see cref="OrganizationUnit"/> class.
    /// </summary>
    /// <param name="id">id</param>
    /// <param name="displayName">显示名称.</param>
    /// <param name="parentId">如果 OU 是根，则为父 ID 或 null.</param>
    /// <param name="tenantId">主机的租户 ID 或 null.</param>
    public OrganizationUnit(Guid id, string displayName, Guid? parentId = null, Guid? tenantId = null)
        : base(id)
    {
        TenantId = tenantId;
        DisplayName = displayName;
        ParentId = parentId;
        Roles = new Collection<OrganizationUnitRole>();
    }

    public static string CreateCode(params int[] numbers)
    {
        if (numbers == null)
        {
            return null;
        }

        return string.Join(".", numbers.Select(number => number.ToString(new string('0', OrganizationUnitConsts.CodeUnitLength))));
    }

    public static string AppendCode(string parentCode, string childCode)
    {
        if (string.IsNullOrEmpty(parentCode))
        {
            return childCode;
        }

        return parentCode + "." + childCode;
    }

    public static string CalculateNextCode(string code)
    {
        var parentCode = GetParentCode(code);
        var lastUnitCode = GetLastUnitCode(code);

        return AppendCode(parentCode, CreateCode(Convert.ToInt32(lastUnitCode) + 1));

        static string GetLastUnitCode(string code)
        {
            var splittedCode = code.Split('.');
            return splittedCode[^1];
        }

        static string GetParentCode(string code)
        {
            var splittedCode = code.Split('.');
            if (splittedCode.Length == 1)
            {
                return null;
            }

            return string.Join(".", splittedCode.Take(splittedCode.Length - 1));
        }
    }


    public virtual void AddRole(Guid roleId)
    {
        if (!Roles.Any(r => r.RoleId == roleId))
        {
            Roles.Add(new OrganizationUnitRole(roleId, Id, TenantId));
        }
    }

    public virtual void RemoveRole(Guid roleId)
    {
        var item = Roles.FirstOrDefault(r => r.RoleId == roleId);

        if (item != null)
            Roles.Remove(item);
    }

}