using Application.Abstractions.Data;
using Domain.Entities.Donations.ValueObject;
using Web.Api.Common;
using Microsoft.EntityFrameworkCore;

namespace Web.Api.Endpoints.Widget;

/// <summary>WidgetToken + configID 기반 크루 리더보드 (위젯 초기 로드용, 인증 불필요).
/// configID로 CrewWidgetConfig → Crew 식별 → CrewMember 기반 base ranking + CrewDonationSummary로 수치 갱신.
/// 후원 없는 크루원도 0원으로 표시.</summary>
internal sealed class CrewRankingByToken : IEndpoint
{
    public void MapEndpoint(IEndpointRouteBuilder app)
    {
        app.MapGet("api/widget/crew/by-token/{widgetToken}", async (
            string widgetToken,
            int? configID,
            IAppDbContext db,
            CancellationToken ct
        ) => {
            var channelID = await db.Channel.AsNoTracking()
                .Where(c => c.WidgetToken == widgetToken && c.IsActive)
                .Select(c => c.ID)
                .FirstOrDefaultAsync(ct);

            if (channelID == 0)
            {
                return ApiResponse.Ok(new { list = Array.Empty<object>(), totalAmount = 0 });
            }

            // CrewWidgetConfig 조회
            var widgetCfgQuery = db.CrewWidgetConfig.AsNoTracking()
                .Where(w => w.ChannelID == channelID);

            if (configID.HasValue)
            {
                widgetCfgQuery = widgetCfgQuery.Where(w => w.ID == configID.Value);
            }
            else
            {
                widgetCfgQuery = widgetCfgQuery.Where(w => w.IsActive);
            }

            var widgetCfg = await widgetCfgQuery
                .OrderByDescending(w => w.ID)
                .Select(w => new { w.CrewID, w.MaxDisplayCount })
                .FirstOrDefaultAsync(ct);

            if (widgetCfg is null)
            {
                return ApiResponse.Ok(new { list = Array.Empty<object>(), totalAmount = 0 });
            }

            // Base: 크루의 모든 active 크루원 (Channel.ThumbnailUrl 우선)
            var baseMembers = await db.CrewMember.AsNoTracking()
                .Where(m => m.CrewID == widgetCfg.CrewID && m.IsActive)
                .OrderBy(m => m.SortOrder).ThenBy(m => m.JoinedAt)
                .Select(m => new
                {
                    ID = m.ID,
                    Nickname = m.Nickname,
                    Icon = m.Channel != null && m.Channel.ThumbnailUrl != null
                        ? m.Channel.ThumbnailUrl
                        : (m.Member != null ? m.Member.Thumb : null),
                    ChannelName = m.Channel != null ? m.Channel.Name : null
                })
                .ToListAsync(ct);

            // 가장 최근 CrewSession (active 우선, 없으면 ended)
            var sessionID = await db.CrewSession.AsNoTracking()
                .Where(s => s.CrewID == widgetCfg.CrewID && s.Status == CrewSessionStatus.Active)
                .OrderByDescending(s => s.CreatedAt)
                .Select(s => (int?)s.ID)
                .FirstOrDefaultAsync(ct);

            if (sessionID is null)
            {
                sessionID = await db.CrewSession.AsNoTracking()
                    .Where(s => s.CrewID == widgetCfg.CrewID)
                    .OrderByDescending(s => s.CreatedAt)
                    .Select(s => (int?)s.ID)
                    .FirstOrDefaultAsync(ct);
            }

            // CrewDonationSummary 데이터 (있으면)
            var summaryDict = sessionID.HasValue
                ? (await db.CrewDonationSummary.AsNoTracking()
                    .Where(s => s.CrewSessionID == sessionID.Value)
                    .Select(s => new { s.CrewMemberID, s.TotalAmount, s.DonationCount, s.ContributionRate })
                    .ToListAsync(ct)).ToDictionary(s => s.CrewMemberID)
                : new();

            var sessionTotal = sessionID.HasValue
                ? await db.CrewSession.AsNoTracking()
                    .Where(s => s.ID == sessionID.Value)
                    .Select(s => s.TotalAmount)
                    .FirstOrDefaultAsync(ct)
                : 0;

            // base + summary merge
            var merged = baseMembers.Select(m =>
            {
                var s = summaryDict.GetValueOrDefault(m.ID);
                return new
                {
                    crewMemberID = m.ID,
                    nickname = m.Nickname,
                    icon = m.Icon,
                    channelName = m.ChannelName,
                    totalAmount = s?.TotalAmount ?? 0,
                    donationCount = s?.DonationCount ?? 0,
                    contributionRate = s?.ContributionRate ?? 0m
                };
            })
            .OrderByDescending(x => x.totalAmount)
            .Take(widgetCfg.MaxDisplayCount)
            .ToList();

            var list = merged.Select((x, i) => new
            {
                rank = i + 1,
                crewMemberID = x.crewMemberID,
                nickname = x.nickname,
                icon = x.icon,
                channelName = x.channelName,
                totalAmount = x.totalAmount,
                donationCount = x.donationCount,
                contributionRate = x.contributionRate
            }).ToList();

            return ApiResponse.Ok(new { list, totalAmount = sessionTotal });
        })
        .WithTags("Widget")
        .AllowAnonymous();
    }
}