using NeonSprawl.Server.Game.Contracts;
using NeonSprawl.Server.Game.Factions;

namespace NeonSprawl.Server.Game.Rewards;

/// <summary>Id normalization and composite keys for reward delivery stores (NEO-126).</summary>
public static class RewardDeliveryIds
{
    /// <summary>Trim + lowercase; empty when input is null/whitespace.</summary>
    public static string NormalizePlayerId(string? playerId)
    {
        var trimmed = playerId?.Trim();
        if (string.IsNullOrEmpty(trimmed))
        {
            return string.Empty;
        }

        return trimmed.ToLowerInvariant();
    }

    /// <summary>Trim + lowercase; empty when input is null/whitespace.</summary>
    public static string NormalizeQuestId(string? questId) => NormalizePlayerId(questId);

    /// <summary>Trim + lowercase; empty when input is null/whitespace.</summary>
    public static string NormalizeContractInstanceId(string? contractInstanceId) =>
        ContractInstanceIds.NormalizeContractInstanceId(contractInstanceId);

    /// <summary>Stable idempotency key for quest completion delivery.</summary>
    public static string MakeIdempotencyKey(string? playerId, string? questId)
    {
        var p = NormalizePlayerId(playerId);
        var q = NormalizeQuestId(questId);
        if (p.Length == 0 || q.Length == 0)
        {
            return string.Empty;
        }

        return $"{p}:quest_complete:{q}";
    }

    /// <summary>Stable audit row id for one rep grant on a quest completion delivery (NEO-138).</summary>
    public static string MakeReputationDeltaId(string idempotencyKey, string? factionId)
    {
        var faction = FactionStandingIds.NormalizeFactionId(factionId);
        if (idempotencyKey.Length == 0 || faction.Length == 0)
        {
            return string.Empty;
        }

        return $"{idempotencyKey}:rep:{faction}";
    }

    /// <summary>Rollback audit row id for compensating rep revert (NEO-138).</summary>
    public static string MakeReputationRollbackDeltaId(string reputationDeltaId) =>
        reputationDeltaId.Length == 0 ? string.Empty : $"{reputationDeltaId}:rollback";

    /// <summary>Composite store key for quest completion delivery.</summary>
    public static string MakeStoreKey(string? playerId, string? questId) =>
        MakeStoreKey(playerId, RewardDeliverySourceKinds.QuestCompletion, questId);

    /// <summary>Composite store key for <paramref name="playerId"/> + <paramref name="sourceKind"/> + source id.</summary>
    public static string MakeStoreKey(string? playerId, string? sourceKind, string? sourceId)
    {
        var p = NormalizePlayerId(playerId);
        var kind = NormalizeSourceKind(sourceKind);
        var id = NormalizeSourceId(sourceKind, sourceId);
        if (p.Length == 0 || kind.Length == 0 || id.Length == 0)
        {
            return string.Empty;
        }

        return $"{p}\0{kind}\0{id}";
    }

    /// <summary>Resolves the source id field for a persisted delivery event.</summary>
    public static string GetSourceId(in RewardDeliveryEvent deliveryEvent) =>
        string.Equals(deliveryEvent.SourceKind, RewardDeliverySourceKinds.ContractCompletion, StringComparison.Ordinal)
            ? NormalizeContractInstanceId(deliveryEvent.ContractInstanceId)
            : NormalizeQuestId(deliveryEvent.QuestId);

    /// <summary>Composite store key for a persisted delivery event.</summary>
    public static string MakeStoreKey(in RewardDeliveryEvent deliveryEvent) =>
        MakeStoreKey(deliveryEvent.PlayerId, deliveryEvent.SourceKind, GetSourceId(deliveryEvent));

    private static string NormalizeSourceKind(string? sourceKind)
    {
        var trimmed = sourceKind?.Trim();
        if (string.IsNullOrEmpty(trimmed))
        {
            return string.Empty;
        }

        return trimmed.ToLowerInvariant();
    }

    private static string NormalizeSourceId(string? sourceKind, string? sourceId) =>
        string.Equals(sourceKind, RewardDeliverySourceKinds.ContractCompletion, StringComparison.OrdinalIgnoreCase)
            ? NormalizeContractInstanceId(sourceId)
            : NormalizeQuestId(sourceId);
}