using LiteCharms.Features.Utilities.Commands;
using LiteCharms.Infrastructure.Database;

namespace LiteCharms.Features.Leads.Commands.Handlers;

public class CreateLeadCommandHandler(IDbContextFactory<ShopDbContext> contextFactory, ISender mediator) : IRequestHandler<CreateLeadCommand, Result<Guid>>
{
    public async ValueTask<Result<Guid>> Handle(CreateLeadCommand request, CancellationToken cancellationToken)
    {
        try
        {
            var hashCommand = ComputeHashCommand.Create($"{request.ClickId}{request.AppClickId}{request.WebClickId}");
            var hashResult = await mediator.Send(hashCommand, cancellationToken);

            if(hashResult.IsFailed)
                return Result.Fail<Guid>(new Error($"Failed to compute hash for lead -> Google ClickId: {request.ClickId}, App ClickId: {request.AppClickId}, Web ClickId: {request.WebClickId}")
                    .CausedBy(hashResult.Errors));

            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var newLead = context.Leads.Add(new Entities.Lead
            {
                WebClickId = request.WebClickId,
                AppClickId = request.AppClickId,
                Source = request.Source,
                ClickId = request.ClickId,
                AdGroupId = request.AdGroupId,
                AdName = request.AdName,
                CampaignId = request.CampaignId,
                ClickLocation = request.ClickLocation,
                CustomerId = request.CustomerId,
                FeedItemId = request.FeedItemId,
                Status = Models.LeadStatus.New,
                TargetId = request.TargetId,
                AttributionHash = hashResult.Value
            });

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok(newLead.Entity.Id)
                : Result.Fail<Guid>(new Error($"Failed to create lead -> Google ClickId: {request.ClickId}, App ClickId: {request.AppClickId}, Web ClickId: {request.WebClickId}"));
        }
        catch (Exception ex)
        {
            return Result.Fail<Guid>(new Error(ex.Message).CausedBy(ex));
        }
    }
}