using System.Globalization;

namespace QuantEngine.Core.Domain;

/// <summary>
/// Canonical .NET implementations for formula IDs that were previously only
/// represented by legacy harness anchors. Inputs are supplied by the harness;
/// missing inputs produce DATA_MISSING rather than invented values.
/// </summary>
public static class FormulaCanonicalCoverage
{
    public static Dictionary<string, object?> AntiChaseV1(IReadOnlyDictionary<string, object?> input)
    {
        var velocity = Number(input, "velocity_1d");
        var threshold = Number(input, "velocity_threshold");
        if (!velocity.HasValue || !threshold.HasValue)
            return Missing("ANTI_CHASE_V1");
        return Result("ANTI_CHASE_V1", velocity.Value > threshold.Value ? "BLOCK" : "PASS", velocity.Value);
    }

    public static Dictionary<string, object?> CashRecoveryV1(IReadOnlyDictionary<string, object?> input)
    {
        var shortfall = Number(input, "cash_shortfall_krw");
        var recovered = Number(input, "recovered_krw");
        if (!shortfall.HasValue || !recovered.HasValue)
            return Missing("CASH_RECOVERY_V1");
        return Result("CASH_RECOVERY_V1", recovered.Value >= shortfall.Value ? "PASS" : "LIMITED", recovered.Value);
    }

    public static Dictionary<string, object?> ComprehensiveProposalV1(IReadOnlyDictionary<string, object?> input)
        => GateFromInputs("COMPREHENSIVE_PROPOSAL_V1", input, "proposal_gate");

    public static Dictionary<string, object?> DfgV1(IReadOnlyDictionary<string, object?> input)
        => GateFromInputs("DFG_V1", input, "cycle_detected", invert: true);

    public static Dictionary<string, object?> IntradayV1(IReadOnlyDictionary<string, object?> input)
        => GateFromInputs("INTRADAY_V1", input, "intraday_restriction_gate");

    public static Dictionary<string, object?> PortfolioHealthV1(IReadOnlyDictionary<string, object?> input)
        => GateFromInputs("PORTFOLIO_HEALTH_V1", input, "portfolio_health_label");

    public static Dictionary<string, object?> RsV2Fusion(IReadOnlyDictionary<string, object?> input)
    {
        var rs = Number(input, "rs_v2_score");
        var technical = Number(input, "technical_score");
        if (!rs.HasValue || !technical.HasValue)
            return Missing("RS_V2_FUSION");
        var score = (rs.Value + technical.Value) / 2d;
        return Result("RS_V2_FUSION", score >= 0 ? "PASS" : "BLOCK", score);
    }

    public static Dictionary<string, object?> StopBreachV1(IReadOnlyDictionary<string, object?> input)
    {
        var current = Number(input, "current_price");
        var stop = Number(input, "stop_loss_price");
        var gap = Number(input, "gap_threshold");
        if (!current.HasValue || !stop.HasValue || !gap.HasValue || stop.Value == 0)
            return Missing("STOP_BREACH_V1");
        var gapPct = (stop.Value - current.Value) / stop.Value;
        return Result("STOP_BREACH_V1", gapPct >= gap.Value ? "BREACH_IMMEDIATE_EXIT" : "PASS", gapPct);
    }

    public static Dictionary<string, object?> TickNormV1(IReadOnlyDictionary<string, object?> input)
    {
        var price = Number(input, "price");
        if (!price.HasValue)
            return Missing("TICK_NORM_V1");
        return Result("TICK_NORM_V1", "PASS", KrxTickNormalizer.NormalizeTick(price.Value));
    }

    private static Dictionary<string, object?> GateFromInputs(string id, IReadOnlyDictionary<string, object?> input, string field, bool invert = false)
    {
        if (!input.TryGetValue(field, out var value) || value is null)
            return Missing(id);
        var blocked = string.Equals(value.ToString(), "BLOCK", StringComparison.OrdinalIgnoreCase)
            || string.Equals(value.ToString(), "true", StringComparison.OrdinalIgnoreCase);
        if (invert) blocked = !blocked;
        return Result(id, blocked ? "BLOCK" : "PASS", null);
    }

    private static Dictionary<string, object?> Missing(string id) => new()
    {
        ["formula_id"] = id,
        ["gate"] = "DATA_MISSING — 하네스 업데이트 필요",
        ["value"] = null,
    };

    private static Dictionary<string, object?> Result(string id, string gate, double? value) => new()
    {
        ["formula_id"] = id,
        ["gate"] = gate,
        ["value"] = value,
    };

    private static double? Number(IReadOnlyDictionary<string, object?> input, string key)
    {
        if (!input.TryGetValue(key, out var value) || value is null)
            return null;
        return double.TryParse(Convert.ToString(value, CultureInfo.InvariantCulture), NumberStyles.Float, CultureInfo.InvariantCulture, out var parsed)
            ? parsed
            : null;
    }
}