using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using RudderSdk.Core.Models.Quests;

namespace RudderSdk.Core;

/// <summary>
/// Global quests (list + claim), distinct from scenario quest nodes which
/// advance through <see cref="QuestEffect"/>.
/// </summary>
public sealed class QuestsService
{
    private readonly RudderClient _client;

    internal QuestsService(RudderClient client) => _client = client;

    /// <summary>Lists the player's quests with per-objective progress and rewards.</summary>
    public async Task<IReadOnlyList<Quest>> ListAsync(CancellationToken cancellationToken = default)
    {
        var response = await _client.SendAsync<ListQuestsResponse>(
            "POST",
            "/sdk/v1/quests/list",
            cancellationToken).ConfigureAwait(false);

        return response?.Quests ?? new List<Quest>();
    }

    /// <summary>Claims a completed quest's rewards (idempotent server-side).</summary>
    public Task<ClaimQuestResponse> ClaimAsync(string questSlug, CancellationToken cancellationToken = default)
        => _client.SendAsync<ClaimQuestRequest, ClaimQuestResponse>(
            "POST",
            "/sdk/v1/quests/claim",
            new ClaimQuestRequest { QuestSlug = questSlug },
            cancellationToken);

    /// <summary>Reports progress for a metric and returns the ids of quests completed by this report.</summary>
    public async Task<IReadOnlyList<string>> ReportProgressAsync(string metric, long amount, CancellationToken cancellationToken = default)
    {
        var response = await _client.SendAsync<ReportQuestProgressRequest, ReportQuestProgressResponse>(
            "POST",
            "/sdk/v1/quests/progress",
            new ReportQuestProgressRequest { Metric = metric, Amount = amount },
            cancellationToken).ConfigureAwait(false);

        return response?.CompletedQuestSlugs ?? new List<string>();
    }
}