using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Application.Helpers;
using Domain.Entities.Developers;
using SharedKernel.Results;

namespace Application.Features.Api.Developers.Apps.CreateApp;

internal sealed class Handler(IAppDbContext db) : ICommandHandler<Command, Result<Response>>
{
    public async Task<Result<Response>> Handle(Command request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request.Name) || request.Name.Length > 100)
        {
            return Result.Failure<Response>(Error.Problem("App.NameInvalid", "Name is required (1-100 chars)."));
        }

        var app = ApiApplication.Create(request.OwnerMemberID, request.Name, request.Description, request.HomepageUrl);
        app.Approve();

        var clientID = ApiTokenGenerator.GenerateClientID();
        var secret = ApiTokenGenerator.GenerateClientSecret();

        await db.ApiApplication.AddAsync(app, ct);
        await db.SaveChangesAsync(ct);

        var credential = ApiCredential.Create(app.ID, clientID, ApiTokenGenerator.Hash(secret), ApiTokenGenerator.Hint(secret));
        await db.ApiCredential.AddAsync(credential, ct);

        foreach (var scope in request.Scopes ?? [])
        {
            if (string.IsNullOrWhiteSpace(scope)) { continue; }
            await db.ApiApplicationScope.AddAsync(ApiApplicationScope.Create(app.ID, scope.Trim()), ct);
        }

        await db.SaveChangesAsync(ct);

        return Result.Success(new Response(app.ID, clientID, secret));
    }
}