using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Domain.Entities.Members;

namespace Domain.Entities.Donations;

/// <summary>
/// 크리에이터가 직접 설정한 채널 전용 칭호 (투네이션 방식).
/// 누적 후원 금액을 달성한 후원자에게 자동 부여됨.
/// </summary>
public sealed class ChannelTitle
{
    [ForeignKey(nameof(ChannelID))]
    public Channel Channel { get; private set; } = null!;

    [Key]
    public int ID { get; private set; }

    public int ChannelID { get; private set; }

    public string Name { get; private set; } = default!;

    public string? Description { get; private set; }

    public long MinAmount { get; private set; }

    public string Color { get; private set; } = "#A855F7";

    public string? IconUrl { get; private set; }

    public int SortOrder { get; private set; }

    public bool IsActive { get; private set; } = true;

    public DateTime? UpdatedAt { get; private set; }

    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;

    private ChannelTitle() { }

    private ChannelTitle(int channelID, string name, long minAmount, string color)
    {
        if (channelID <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(channelID));
        }

        if (string.IsNullOrWhiteSpace(name))
        {
            throw new ArgumentException("Name is required.", nameof(name));
        }

        if (name.Length > 20)
        {
            throw new ArgumentOutOfRangeException(nameof(name));
        }

        if (minAmount < 0)
        {
            throw new ArgumentOutOfRangeException(nameof(minAmount));
        }

        ChannelID = channelID;
        Name = name;
        MinAmount = minAmount;
        Color = string.IsNullOrWhiteSpace(color) ? "#A855F7" : color;
    }

    public static ChannelTitle Create(int channelID, string name, long minAmount, string color)
    {
        return new(channelID, name, minAmount, color);
    }

    public void Update(string name, string? description, long minAmount, string color, string? iconUrl, bool isActive)
    {
        if (string.IsNullOrWhiteSpace(name))
        {
            throw new ArgumentException("Name is required.", nameof(name));
        }

        if (name.Length > 20)
        {
            throw new ArgumentOutOfRangeException(nameof(name));
        }

        if (description != null && description.Length > 100)
        {
            throw new ArgumentOutOfRangeException(nameof(description));
        }

        if (minAmount < 0)
        {
            throw new ArgumentOutOfRangeException(nameof(minAmount));
        }

        Name = name;
        Description = description;
        MinAmount = minAmount;
        Color = string.IsNullOrWhiteSpace(color) ? Color : color;
        IconUrl = iconUrl;
        IsActive = isActive;
        UpdatedAt = DateTime.UtcNow;
    }

    public void SetOrder(int order)
    {
        SortOrder = order;
        UpdatedAt = DateTime.UtcNow;
    }
}