using ErrorOr;
using Musify.Application.Configuration;
using Musify.Application.Services;
using Musify.Application.Shared;
using Musify.Domain.Entities;
using Musify.Domain.ValueObjects;

namespace Musify.Application.Pictures;

/// <summary>What an album or playlist needs to switch to a freshly uploaded picture.</summary>
public sealed record PreparedPicture(UploadIntent Intent, EntityPictures Pictures, string FinalKey, ImageSizes Sizes);

public static class PictureSourceChange
{
    public static async Task<ErrorOr<PreparedPicture>> PrepareAsync(
        UploadIntentValidator uploadIntentValidator,
        Guid intentId,
        long userId,
        UploadIntentPurpose purpose,
        IPictureOwnerConfiguration owner,
        CancellationToken cancellationToken)
    {
        var validation = await uploadIntentValidator.ValidateAndLoadAsync(intentId, userId, purpose, cancellationToken);
        if (validation.IsError)
            return validation.Errors;

        var intent = validation.Value;

        return new PreparedPicture(
            intent,
            EntityPictures.Pending(intent.ObjectName),
            owner.Routes.BuildOriginalPicturePath(userId, intent.ObjectName),
            owner.PicturesSizes.ToImageSizes(owner.Routes));
    }
}