using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json.Linq;

namespace RudderSdk.Core;

/// <summary>A scenario store-offer node. Resolve it with <see cref="PurchaseAsync"/> or <see cref="DeclineAsync"/>.</summary>
public sealed class StoreOfferEffect
{
    private readonly EffectHandle _handle;

    internal StoreOfferEffect(EffectHandle handle) => _handle = handle;

    /// <summary>Run id.</summary>
    public string RunId => _handle.RunId;

    /// <summary>Scenario id.</summary>
    public string ScenarioSlug => _handle.ScenarioSlug;

    /// <summary>Node id.</summary>
    public string NodeId => _handle.NodeId;

    /// <summary>Store slug from the node data, if present.</summary>
    public string StoreSlug => _handle.Get("storeSlug", string.Empty);

    /// <summary>Optional message from the node data.</summary>
    public string? Message
    {
        get
        {
            var value = _handle.Get<string?>("message", null);
            return string.IsNullOrEmpty(value) ? null : value;
        }
    }

    /// <summary>Node data payload.</summary>
    public JObject Data => _handle.Data;

    /// <summary>True after the offer was resolved once.</summary>
    public bool IsResolved { get; private set; }

    /// <summary>Reads a typed value from the node data.</summary>
    public T Get<T>(string key, T defaultValue = default!) => _handle.Get(key, defaultValue);

    /// <summary>Posts the <c>onPurchase</c> callback.</summary>
    public Task PurchaseAsync(CancellationToken cancellationToken = default) => ResolveAsync("onPurchase", cancellationToken);

    /// <summary>Posts the <c>onPurchase</c> callback (fire-and-forget).</summary>
    public void Purchase() => Resolve("onPurchase");

    /// <summary>Posts the <c>onDecline</c> callback.</summary>
    public Task DeclineAsync(CancellationToken cancellationToken = default) => ResolveAsync("onDecline", cancellationToken);

    /// <summary>Posts the <c>onDecline</c> callback (fire-and-forget).</summary>
    public void Decline() => Resolve("onDecline");

    private async Task ResolveAsync(string handle, CancellationToken cancellationToken)
    {
        if (IsResolved)
            return;

        IsResolved = true;
        await _handle.CompleteAsync(handle, cancellationToken).ConfigureAwait(false);
    }

    private void Resolve(string handle)
    {
        if (IsResolved)
            return;

        IsResolved = true;
        _handle.Complete(handle);
    }
}