using Application.Abstractions.Data;
using Web.Api.Common;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace Web.Api.Endpoints.Widget;

/// <summary>WidgetToken + configID 기반 후원 목표 진행 상태 (위젯 초기 로드용, 인증 불필요).
/// configID 미지정 시 활성 첫 번째 자동 선택.</summary>
internal sealed class GoalProgressByToken : IEndpoint
{
    public void MapEndpoint(IEndpointRouteBuilder app)
    {
        app.MapGet("api/widget/goal/by-token/{widgetToken}", async (
            string widgetToken,
            int? configID,
            IAppDbContext db,
            ISender sender,
            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((object?)null);
            }

            int? targetGoalConfigID;
            if (configID.HasValue)
            {
                targetGoalConfigID = await db.DonationGoalConfig.AsNoTracking()
                    .Where(g => g.ChannelID == channelID && g.ID == configID.Value)
                    .Select(g => (int?)g.ID)
                    .FirstOrDefaultAsync(ct);
            }
            else
            {
                targetGoalConfigID = await db.DonationGoalConfig.AsNoTracking()
                    .Where(g => g.ChannelID == channelID && g.IsActive)
                    .OrderByDescending(g => g.ID)
                    .Select(g => (int?)g.ID)
                    .FirstOrDefaultAsync(ct);
            }

            if (targetGoalConfigID is null)
            {
                return ApiResponse.Ok((object?)null);
            }

            var result = await sender.Send(new Application.Features.Api.DonationGoal.GetProgress.Query(channelID, targetGoalConfigID.Value), ct);
            if (result.IsFailure)
            {
                return ApiResponse.Ok((object?)null);
            }

            var data = result.Value;
            return ApiResponse.Ok(new
            {
                goalConfigID = data.GoalConfigID,
                title = data.Title,
                startAmount = data.StartAmount,
                targetAmount = data.TargetAmount,
                currentAmount = data.CurrentAmount,
                percent = data.Percent
            });
        })
        .WithTags("Widget")
        .AllowAnonymous();
    }
}