using System;
using System.Threading;
using System.Threading.Tasks;
using RudderSdk.Core.Models.BattlePass;

namespace RudderSdk.Core;

/// <summary>
/// Session of a scenario battle-pass node. Exposes the battle pass operations
/// bound to this node's scenario/node/run ids, plus explicit boundary crossings
/// the game drives from its UI; the server validates each crossing.
/// </summary>
public sealed class BattlePassSession
{
    private readonly BattlePassService _battlePass;

    internal BattlePassSession(ScenarioNodeContext context, BattlePassService battlePass)
    {
        Context = context;
        _battlePass = battlePass;
    }

    /// <summary>Underlying node context.</summary>
    public ScenarioNodeContext Context { get; }

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

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

    /// <summary>Reads current progress (xp, level, premium ownership, claimed tiers) for this node.</summary>
    public Task<GetBattlePassProgressResponse> GetProgressAsync(CancellationToken cancellationToken = default)
        => _battlePass.GetProgressAsync(Context.ScenarioId, Context.NodeId, cancellationToken);

    /// <summary>Credits xp from a configured source.</summary>
    public Task<AddBattlePassXpResponse> AddXpAsync(string source, long amount, CancellationToken cancellationToken = default)
        => _battlePass.AddXpAsync(new AddBattlePassXpRequest
        {
            ScenarioId = Context.ScenarioId,
            NodeId = Context.NodeId,
            RunId = Context.RunId,
            Source = source,
            Amount = amount
        }, cancellationToken);

    /// <summary>
    /// Claims a tier reward at a reached level.
    /// <paramref name="track"/> is <see cref="BattlePassService.TrackFree"/> or <see cref="BattlePassService.TrackPremium"/>.
    /// </summary>
    public Task<ClaimBattlePassRewardResponse> ClaimRewardAsync(int level, string track, CancellationToken cancellationToken = default)
        => _battlePass.ClaimRewardAsync(new ClaimBattlePassRewardRequest
        {
            ScenarioId = Context.ScenarioId,
            NodeId = Context.NodeId,
            RunId = Context.RunId,
            Level = level,
            Track = track
        }, cancellationToken);

    /// <summary>Purchases the premium track, then crosses onPremiumPurchase on success.</summary>
    public async Task<PurchaseBattlePassPremiumResponse> PurchasePremiumAsync(CancellationToken cancellationToken = default)
    {
        var response = await _battlePass.PurchasePremiumAsync(new PurchaseBattlePassPremiumRequest
        {
            ScenarioId = Context.ScenarioId,
            NodeId = Context.NodeId,
            RunId = Context.RunId,
            IdempotencyKey = Guid.NewGuid().ToString()
        }, cancellationToken).ConfigureAwait(false);

        if (response != null && response.Success)
            await Context.CompleteAsync("onPremiumPurchase", cancellationToken).ConfigureAwait(false);

        return response!;
    }

    /// <summary>Advances the run through the onLevelUp handle.</summary>
    public Task LevelUpAsync(CancellationToken cancellationToken = default) => Context.CompleteAsync("onLevelUp", cancellationToken);

    /// <summary>Advances the run through the onLevelUp handle (fire-and-forget).</summary>
    public void LevelUp() => Context.Complete("onLevelUp");

    /// <summary>Advances the run through the onMaxLevel handle.</summary>
    public Task MaxLevelAsync(CancellationToken cancellationToken = default) => Context.CompleteAsync("onMaxLevel", cancellationToken);

    /// <summary>Advances the run through the onMaxLevel handle (fire-and-forget).</summary>
    public void MaxLevel() => Context.Complete("onMaxLevel");

    /// <summary>Advances the run through the onComplete handle.</summary>
    public Task CompleteAsync(CancellationToken cancellationToken = default) => Context.CompleteAsync("onComplete", cancellationToken);

    /// <summary>Advances the run through the onComplete handle (fire-and-forget).</summary>
    public void Complete() => Context.Complete("onComplete");
}