using System.Text.Json;
using HrynCo.NotificationService.DAL.Abstract.Templates;

namespace HrynCo.NotificationService.Web.Controllers.Api.Services;

public sealed class UpsertPushTemplateDefinitionRequest
{
    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web);
    public Guid? Revision { get; init; }
    public required IReadOnlyList<TemplateVariableRequest> Variables { get; init; }
    public required IReadOnlyList<PushTemplateTranslationRequest> Translations { get; init; }
    public IReadOnlyList<string>? RemoveLanguageCodes { get; init; }

    public PushTemplateDefinitionPatch ToPatch(Guid serviceId, string key)
    {
        if (Variables is null || Translations is null)
            throw new EmailTemplateWriteException("variables and translations must be JSON arrays, including when empty.", false);
        if (Variables.Any(v => v is null) || Translations.Any(t => t is null))
            throw new EmailTemplateWriteException("variables and translations cannot contain null elements.", false);
        return new PushTemplateDefinitionPatch
        {
            ServiceId = serviceId, Key = key, Revision = Revision,
            Variables = Variables.Select(v => new EmailTemplateVariable { Name = v.Name, Required = v.Required }).ToList(),
            Translations = Translations.Select(t => new PushTemplateTranslation
            {
                LanguageCode = t.LanguageCode, Title = t.Title, Body = t.Body,
                ActionsJson = JsonSerializer.Serialize(t.Actions, JsonOptions)
            }).ToList(),
            RemoveLanguageCodes = RemoveLanguageCodes ?? []
        };
    }
}