using HrynCo.NotificationService.DAL.Abstract;
using HrynCo.NotificationService.DAL.Abstract.Repositories;
using HrynCo.NotificationService.Services.Core;
using HrynCo.NotificationService.Services.Logging;
using static HrynCo.NotificationService.Services.Core.ServiceResultHelper;

namespace HrynCo.NotificationService.Services.EmailChannels.GetUsageSummary;

internal sealed class GetChannelUsageSummaryHandler
    : RequestHandler<GetChannelUsageSummaryQuery, ServiceResult<IReadOnlyList<ChannelUsageEntry>>>
{
    private readonly IEmailChannelRepository _channelsRepository;

    public GetChannelUsageSummaryHandler(
        IContextualSerilogLogger<GetChannelUsageSummaryQuery> logger,
        IUnitOfWork unitOfWork,
        IEmailChannelRepository channelsRepository)
        : base(logger, unitOfWork)
    {
        _channelsRepository = channelsRepository;
    }

    protected override async Task<ServiceResult<IReadOnlyList<ChannelUsageEntry>>> DoOnHandle(
        GetChannelUsageSummaryQuery request, CancellationToken cancellationToken)
    {
        var today = DateOnly.FromDateTime(DateTime.UtcNow);

        var rows = await _channelsRepository.GetAllWithUsageSummaryAsync(today, cancellationToken);

        var entries = rows
            .Select(r => new ChannelUsageEntry(
                ChannelId:    r.Channel.Id,
                ServiceName:  r.Channel.ServiceName,
                ChannelType:  r.Channel.EmailChannelType.ToString(),
                IsActive:     r.Channel.IsActive,
                Priority:     r.Channel.Priority,
                DailyLimit:   r.Channel.DailyLimit,
                MonthlyLimit: r.Channel.MonthlyLimit,
                DailySent:    r.DailySent,
                MonthlySent:  r.MonthlySent))
            .ToList();

        return Success<IReadOnlyList<ChannelUsageEntry>>(entries);
    }
}