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

namespace HrynCo.NotificationService.Services.EmailTemplates.Create;

internal sealed class CreateEmailTemplateHandler
    : RequestHandler<CreateEmailTemplateCommand, ServiceResult<Guid>>
{
    private readonly IEmailTemplateRepository _templates;

    public CreateEmailTemplateHandler(
        IContextualSerilogLogger<CreateEmailTemplateCommand> logger,
        IUnitOfWork unitOfWork,
        IEmailTemplateRepository templates)
        : base(logger, unitOfWork)
    {
        _templates = templates;
    }

    protected override async Task<ServiceResult<Guid>> DoOnHandle(
        CreateEmailTemplateCommand request, CancellationToken cancellationToken)
    {
        var existing = await _templates.GetAsync(
            request.ServiceName, request.Key, request.LanguageCode, cancellationToken);

        if (existing is not null)
            return Failure<Guid>("Template already exists.", ServiceErrorCode.Conflict);

        var template = new EmailTemplate
        {
            ServiceName = request.ServiceName,
            Key = request.Key,
            LanguageCode = request.LanguageCode,
            Subject = request.Subject,
            HtmlBody = request.HtmlBody,
            TextBody = request.TextBody,
            Variables = request.Variables
        };

        await _templates.AddAsync(template, cancellationToken);

        return Success(template.Id);
    }
}