using Application.Abstractions.Data;
using Domain.Entities.Forum.ValueObject;
using Microsoft.EntityFrameworkCore;
using BoardEntity = Domain.Entities.Forum.Boards.Board;
using BoardGroupEntity = Domain.Entities.Forum.Boards.BoardGroup;
using BoardMetaEntity = Domain.Entities.Forum.Boards.BoardMeta;

namespace Application.Helpers;

/// <summary>
/// 물리 게시판 lazy 시드 (d2 §③ M3) — 코드별 물리 Board 행이 없으면 BoardGroup+Board+BoardMeta 를 생성하고 Board.ID 를 반환한다.
/// 종목 가상보드(CreatePost 의 ResolveStockBoardID)와 동일한 패턴이며, 수익인증(proof)/장전브리핑(briefing) 처럼
/// 물리 보드가 필요한 곳에서 재사용한다. 마이그레이션 데이터 시드 대신 최초 사용 시점 provisioning 을 택해
/// (예측 채점처럼) 시드 여부와 무관하게 항상 존재를 보장한다.
/// </summary>
public static class BoardSeeder
{
    /// <summary>수익인증 게시판 코드 — 이미지 필수(RequireImage), 사진/동영상 레이아웃.</summary>
    public const string ProofBoardCode = "proof";

    /// <summary>장전 브리핑 게시판 코드 — 공지 리스트(IsNotice 발행).</summary>
    public const string BriefingBoardCode = "briefing";

    /// <summary>고객지원(공지) 게시판 코드 — 상단 네비 "고객지원" 대상.</summary>
    public const string NoticeBoardCode = "notice";

    /// <summary>고객지원 게시판(Code="notice")을 해석 — 없으면 기본 리스트로 lazy 시드하고 Board.ID 반환.</summary>
    public static Task<int> ResolveNoticeBoardIDAsync(IAppDbContext db, CancellationToken ct)
    {
        return ResolveAsync(db, NoticeBoardCode, "고객지원", meta =>
        {
            meta.List = new Domain.Entities.Forum.Boards.BoardMetaList { Layout = BoardLayout.Default, PerPage = 20 };
            meta.View = new Domain.Entities.Forum.Boards.BoardMetaView { AllowLike = true, AllowBookmark = true };
            meta.Write = new Domain.Entities.Forum.Boards.BoardMetaWrite { AllowEditor = true, AllowImage = true };
            meta.Comment = new Domain.Entities.Forum.Boards.BoardMetaComment { EnableComment = true, AllowLike = true };
        }, ct);
    }

    /// <summary>피드 게시판 코드 — 피드 시스템 대상(SeedFeedBoard 마이그레이션과 동일 코드).</summary>
    public const string FeedBoardCode = "feed";

    /// <summary>피드 게시판(Code="feed")을 해석 — 없으면 Feed 레이아웃으로 lazy 시드. BoardGroup 만 남은 재빌드 상태를 복구.</summary>
    public static Task<int> ResolveFeedBoardIDAsync(IAppDbContext db, CancellationToken ct)
    {
        return ResolveAsync(db, FeedBoardCode, "피드", meta =>
        {
            meta.List = new Domain.Entities.Forum.Boards.BoardMetaList { Layout = BoardLayout.Feed, PerPage = 20 };
            meta.View = new Domain.Entities.Forum.Boards.BoardMetaView { AllowLike = true, AllowBookmark = true };
            meta.Write = new Domain.Entities.Forum.Boards.BoardMetaWrite { AllowEditor = true, AllowImage = true };
            meta.Comment = new Domain.Entities.Forum.Boards.BoardMetaComment { EnableComment = true, AllowLike = true };
        }, ct);
    }

    /// <summary>수익인증 게시판(Code="proof")을 해석 — 없으면 이미지 필수·사진/동영상 레이아웃으로 lazy 시드하고 Board.ID 반환.</summary>
    public static Task<int> ResolveProofBoardIDAsync(IAppDbContext db, CancellationToken ct)
    {
        return ResolveAsync(db, ProofBoardCode, "수익인증", meta =>
        {
            meta.List = new Domain.Entities.Forum.Boards.BoardMetaList { Layout = BoardLayout.Media, PerPage = 20 };
            meta.View = new Domain.Entities.Forum.Boards.BoardMetaView { AllowLike = true, AllowBookmark = true, ShowMemberThumb = true };
            meta.Write = new Domain.Entities.Forum.Boards.BoardMetaWrite { AllowEditor = true, AllowImage = true, RequireImage = true };
            meta.Comment = new Domain.Entities.Forum.Boards.BoardMetaComment { EnableComment = true, AllowLike = true };
        }, ct);
    }

    /// <summary>장전 브리핑 게시판(Code="briefing")을 해석 — 없으면 공지 리스트로 lazy 시드하고 Board.ID 반환.</summary>
    public static Task<int> ResolveBriefingBoardIDAsync(IAppDbContext db, CancellationToken ct)
    {
        return ResolveAsync(db, BriefingBoardCode, "장전 시황", meta =>
        {
            meta.List = new Domain.Entities.Forum.Boards.BoardMetaList { Layout = BoardLayout.Default, PerPage = 20 };
            meta.View = new Domain.Entities.Forum.Boards.BoardMetaView { AllowLike = true, AllowBookmark = true };
            meta.Write = new Domain.Entities.Forum.Boards.BoardMetaWrite { AllowEditor = true, AllowImage = true };
            meta.Comment = new Domain.Entities.Forum.Boards.BoardMetaComment { EnableComment = true, AllowLike = true };
        }, ct);
    }

    private static async Task<int> ResolveAsync(IAppDbContext db, string code, string name, Action<BoardMetaEntity> configureMeta, CancellationToken ct)
    {
        var existing = await db.Board.AsNoTracking().Where(c => c.Code == code).Select(c => (int?)c.ID).FirstOrDefaultAsync(ct);
        if (existing is int id)
        {
            return id;
        }

        var group = await db.BoardGroup.FirstOrDefaultAsync(c => c.Code == code, ct);
        if (group is null)
        {
            group = new BoardGroupEntity { Code = code, Name = name };
            await db.BoardGroup.AddAsync(group, ct);
            await db.SaveChangesAsync(ct);
        }

        var board = new BoardEntity
        {
            BoardGroupID = group.ID,
            Code = code,
            Name = name,
            IsActive = true,
            IsSearch = true
        };
        await db.Board.AddAsync(board, ct);
        await db.SaveChangesAsync(ct);

        var meta = new BoardMetaEntity { BoardID = board.ID };
        configureMeta(meta);
        await db.BoardMeta.AddAsync(meta, ct);
        await db.SaveChangesAsync(ct);

        return board.ID;
    }
}