using NeonSprawl.Server.Game.Items;
using NeonSprawl.Server.Game.PositionState;

namespace NeonSprawl.Server.Game.Quests;

/// <summary>Maps <c>GET /game/players/{{id}}/quest-progress</c> (NEO-119).</summary>
public static class QuestProgressApi
{
    public const string StatusNotStarted = "not_started";
    public const string StatusActive = "active";
    public const string StatusCompleted = "completed";

    public static WebApplication MapQuestProgressApi(this WebApplication app)
    {
        app.MapGet(
            "/game/players/{id}/quest-progress",
            (string id, IPositionStateStore positions, IQuestDefinitionRegistry questRegistry,
                IPlayerQuestStateStore progressStore, IPlayerInventoryStore inventoryStore,
                IItemDefinitionRegistry itemRegistry, TimeProvider timeProvider, ILogger<Program>? logger) =>
            {
                var trimmedId = id.Trim();
                if (trimmedId.Length == 0 || !positions.TryGetPosition(trimmedId, out _))
                {
                    return Results.NotFound();
                }

                QuestObjectiveWiring.TryRefreshInventoryProgressForPlayer(
                    trimmedId,
                    questRegistry,
                    progressStore,
                    inventoryStore,
                    itemRegistry,
                    timeProvider,
                    logger);

                return Results.Json(BuildSnapshot(trimmedId, questRegistry, progressStore));
            });

        return app;
    }

    internal static QuestProgressListResponse BuildSnapshot(
        string playerId,
        IQuestDefinitionRegistry questRegistry,
        IPlayerQuestStateStore progressStore)
    {
        var defs = questRegistry.GetDefinitionsInIdOrder();
        var rows = new List<QuestProgressRowJson>(defs.Count);
        foreach (var def in defs)
        {
            rows.Add(MapQuestProgressRow(playerId, def.Id, progressStore));
        }

        return new QuestProgressListResponse
        {
            PlayerId = playerId,
            Quests = rows,
            SchemaVersion = QuestProgressListResponse.CurrentSchemaVersion,
        };
    }

    internal static QuestProgressRowJson MapQuestProgressRow(
        string playerId,
        string questId,
        IPlayerQuestStateStore progressStore)
    {
        if (!progressStore.TryGetProgress(playerId, questId, out var snapshot))
        {
            return NotStartedRow(questId);
        }

        return MapQuestProgressRow(snapshot);
    }

    internal static QuestProgressRowJson MapQuestProgressRow(QuestStepState snapshot)
    {
        var counters = new Dictionary<string, int>(snapshot.ObjectiveCounters, StringComparer.Ordinal);
        return snapshot.Status switch
        {
            QuestProgressStatus.Active => new QuestProgressRowJson
            {
                QuestId = snapshot.QuestId,
                Status = StatusActive,
                CurrentStepIndex = snapshot.CurrentStepIndex,
                ObjectiveCounters = counters,
            },
            QuestProgressStatus.Completed => new QuestProgressRowJson
            {
                QuestId = snapshot.QuestId,
                Status = StatusCompleted,
                CurrentStepIndex = snapshot.CurrentStepIndex,
                ObjectiveCounters = counters,
                CompletedAt = snapshot.CompletedAt,
            },
            _ => throw new InvalidOperationException($"Unknown quest progress status '{snapshot.Status}'."),
        };
    }

    private static QuestProgressRowJson NotStartedRow(string questId) =>
        new()
        {
            QuestId = questId,
            Status = StatusNotStarted,
            CurrentStepIndex = 0,
            ObjectiveCounters = new Dictionary<string, int>(StringComparer.Ordinal),
        };
}