using System.ComponentModel.DataAnnotations;

namespace Domain.Entities.Store;

/// <summary>
/// 게임사 제휴 마스터. 상품/쿠폰의 필수 FK.
/// CommissionRate(게임사 몫) % 만 정의. 채널 보상률은 Channel.StoreCommissionRate 에서 채널별로 동적으로 결정.
/// antooza 몫 = 100 - Game.CommissionRate (채널 미선택) 또는 100 - Game.CommissionRate - Channel.StoreCommissionRate (채널 선택).
/// </summary>
public class Game
{
    [Key]
    public int ID { get; private set; }

    /// <summary>게임 코드 (예: "LOL", "BG3"). UNIQUE. 외부 연동/내부 식별자.</summary>
    public string? Code { get; private set; }

    /// <summary>게임 한글명 (필수, UNIQUE) — 예: "리그 오브 레전드"</summary>
    public string KorName { get; private set; } = default!;

    /// <summary>게임 영문명 (선택) — 예: "League of Legends"</summary>
    public string? EngName { get; private set; }

    /// <summary>게임사/퍼블리셔 (예: "Riot Games Korea")</summary>
    public string Publisher { get; private set; } = default!;

    /// <summary>작은 이미지 (목록 카드/썸네일용)</summary>
    public string? Thumbnail { get; private set; }

    /// <summary>큰 이미지 (상품 상세 페이지 배너, 상점 메인 배너용)</summary>
    public string? BigImage { get; private set; }

    /// <summary>게임 소개 (HTML — CKEditor)</summary>
    public string? Description { get; private set; }

    /// <summary>게임사 수익률(커미션) % — 0~100. 주문 금액의 이 비율을 게임사 정산 큐에 적재.</summary>
    public decimal CommissionRate { get; private set; }

    /// <summary>게임 다운로드 또는 공식 사이트 주소 (선택)</summary>
    public string? Link { get; private set; }

    /// <summary>YouTube 예고편 URL (선택). 렌더 시 embed 로 정규화.</summary>
    public string? TrailerUrl { get; private set; }

    /// <summary>최소 사양 (자유 텍스트).</summary>
    public string? MinSpec { get; private set; }

    /// <summary>권장 사양 (자유 텍스트).</summary>
    public string? RecommendedSpec { get; private set; }

    /// <summary>게임 출시일 (선택).</summary>
    public DateOnly? ReleaseDate { get; private set; }

    public virtual List<GameImage> GameImage { get; private set; } = [];

    public virtual List<GameGenreMap> GameGenreMap { get; private set; } = [];

    public virtual List<GameCategoryMap> GameCategoryMap { get; private set; } = [];

    public virtual List<GameLanguageSupport> GameLanguageSupport { get; private set; } = [];

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

    public int Order { get; private set; }

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

    public DateTime? UpdatedAt { get; private set; }

    private Game() { }

    public static Game Create(
        string korName,
        string publisher,
        decimal commissionRate,
        string? code = null,
        string? engName = null,
        string? thumbnail = null,
        string? bigImage = null,
        string? description = null,
        string? link = null,
        int order = 0
    ) {
        ValidateRate(commissionRate);
        ValidateNames(korName, engName);
        ValidatePublisher(publisher);
        ValidateCode(code);
        ValidateLink(link);

        return new Game
        {
            Code = NormalizeOptional(code),
            KorName = korName.Trim(),
            EngName = NormalizeOptional(engName),
            Publisher = publisher.Trim(),
            CommissionRate = commissionRate,
            Thumbnail = thumbnail,
            BigImage = bigImage,
            Description = description,
            Link = NormalizeOptional(link),
            Order = order
        };
    }

    public void Update(
        string korName,
        string publisher,
        decimal commissionRate,
        string? code,
        string? engName,
        string? thumbnail,
        string? bigImage,
        string? description,
        string? link,
        int order,
        bool isActive
    ) {
        ValidateRate(commissionRate);
        ValidateNames(korName, engName);
        ValidatePublisher(publisher);
        ValidateCode(code);
        ValidateLink(link);

        Code = NormalizeOptional(code);
        KorName = korName.Trim();
        EngName = NormalizeOptional(engName);
        Publisher = publisher.Trim();
        CommissionRate = commissionRate;
        Thumbnail = thumbnail;
        BigImage = bigImage;
        Description = description;
        Link = NormalizeOptional(link);
        Order = order;
        IsActive = isActive;
        UpdatedAt = DateTime.UtcNow;
    }

    public void Deactivate()
    {
        IsActive = false;
        UpdatedAt = DateTime.UtcNow;
    }

    /// <summary>상세 미디어/사양 설정 (Admin 게임 상세 폼 전용). Create/Update 시그니처 변경 회피.</summary>
    public void SetDetail(string? trailerUrl, string? minSpec, string? recommendedSpec, DateOnly? releaseDate)
    {
        if (trailerUrl is not null && trailerUrl.Length > 500)
        {
            throw new ArgumentOutOfRangeException(nameof(trailerUrl), "TrailerUrl 은 500자 이하로 입력하세요.");
        }

        TrailerUrl = NormalizeOptional(trailerUrl);
        MinSpec = NormalizeOptional(minSpec);
        RecommendedSpec = NormalizeOptional(recommendedSpec);
        ReleaseDate = releaseDate;
        UpdatedAt = DateTime.UtcNow;
    }

    private static void ValidateRate(decimal commissionRate)
    {
        if (commissionRate < 0 || commissionRate > 100)
        {
            throw new ArgumentOutOfRangeException(nameof(commissionRate), "0~100 사이의 값이어야 합니다.");
        }
    }

    private static void ValidateNames(string korName, string? engName)
    {
        if (string.IsNullOrWhiteSpace(korName))
        {
            throw new ArgumentException("KorName is required.", nameof(korName));
        }

        if (korName.Length > 255)
        {
            throw new ArgumentOutOfRangeException(nameof(korName), "KorName 은 255자 이하로 입력하세요.");
        }

        if (engName is not null && engName.Length > 255)
        {
            throw new ArgumentOutOfRangeException(nameof(engName), "EngName 은 255자 이하로 입력하세요.");
        }
    }

    private static void ValidatePublisher(string publisher)
    {
        if (string.IsNullOrWhiteSpace(publisher))
        {
            throw new ArgumentException("Publisher is required.", nameof(publisher));
        }

        if (publisher.Length > 100)
        {
            throw new ArgumentOutOfRangeException(nameof(publisher), "Publisher 는 100자 이하로 입력하세요.");
        }
    }

    private static void ValidateCode(string? code)
    {
        if (code is not null && code.Length > 6)
        {
            throw new ArgumentOutOfRangeException(nameof(code), "Code 는 6자 이하로 입력하세요.");
        }
    }

    private static void ValidateLink(string? link)
    {
        if (link is not null && link.Length > 255)
        {
            throw new ArgumentOutOfRangeException(nameof(link), "Link 는 255자 이하로 입력하세요.");
        }
    }

    private static string? NormalizeOptional(string? value)
    {
        if (string.IsNullOrWhiteSpace(value))
        {
            return null;
        }

        return value.Trim();
    }
}