namespace Gateway.Models;

// ════════════════════════════════════════════════
// Request: Client → Gateway
// ════════════════════════════════════════════════

public sealed class ChannelForecastRequest
{
    /// <summary>Advertising objective: awareness, traffic, leads, sales</summary>
    public string Objective { get; set; } = "traffic";

    /// <summary>Business category from wizard Step 1</summary>
    public string? BusinessCategory { get; set; }

    /// <summary>Keywords from URL analysis (Step 1)</summary>
    public List<string> Keywords { get; set; } = new();

    /// <summary>Geo targeting from audience step</summary>
    public ForecastGeoTargeting? GeoTargeting { get; set; }

    /// <summary>Audience parameters from Step 2</summary>
    public ForecastAudience? Audience { get; set; }

    /// <summary>Monthly budget in whole dollars</summary>
    public decimal MonthlyBudget { get; set; }

    /// <summary>Channels to estimate (defaults to all selected)</summary>
    public List<string>? Channels { get; set; }
}

public sealed class ForecastGeoTargeting
{
    public List<string>? ZipCodes { get; set; }
    public double? RadiusMiles { get; set; }
    public List<long>? GeoTargetIds { get; set; }
}

public sealed class ForecastAudience
{
    public int? AgeMin { get; set; }
    public int? AgeMax { get; set; }
    public List<string>? Genders { get; set; }
    public List<string>? Interests { get; set; }
}

// ════════════════════════════════════════════════
// Response: Gateway → Client (normalized)
// ════════════════════════════════════════════════

public sealed class ChannelForecastResponse
{
    public bool Ok { get; set; } = true;
    public string Objective { get; set; } = string.Empty;
    public decimal TotalBudget { get; set; }
    public List<ChannelEstimate> Channels { get; set; } = new();
    public ForecastRecommendation? Recommendation { get; set; }
    public ForecastMeta Metadata { get; set; } = new();
}

public sealed class ChannelEstimate
{
    public string Provider { get; set; } = string.Empty;
    public int AllocationPercent { get; set; }
    public decimal AllocatedBudget { get; set; }
    public ChannelEstimateMetrics Estimates { get; set; } = new();
    public double EfficiencyScore { get; set; }
    public string StrengthLabel { get; set; } = string.Empty;
    public string Confidence { get; set; } = "none";
    public string DataSource { get; set; } = "none";
}

public sealed class ChannelEstimateMetrics
{
    public double Impressions { get; set; }
    public double? Reach { get; set; }
    public double Clicks { get; set; }
    public double Conversions { get; set; }
    public decimal AvgCpc { get; set; }
    public decimal AvgCpm { get; set; }
    public decimal? EstimatedCpa { get; set; }
    public double Ctr { get; set; }
}

public sealed class ForecastRecommendation
{
    public string Summary { get; set; } = string.Empty;
    public List<string> Highlights { get; set; } = new();
}

public sealed class ForecastMeta
{
    public DateTimeOffset GeneratedAt { get; set; } = DateTimeOffset.UtcNow;
    public string ForecastPeriod { get; set; } = "30 days";
}

// ════════════════════════════════════════════════
// Objective-weighted scoring
// ════════════════════════════════════════════════

public sealed class MetricWeights
{
    public double Reach { get; }
    public double Impressions { get; }
    public double Cpm { get; }
    public double Clicks { get; }
    public double Cpc { get; }
    public double Ctr { get; }
    public double Conversions { get; }
    public double Cpa { get; }

    public MetricWeights(double reach, double impressions, double cpm,
        double clicks, double cpc, double ctr, double conversions, double cpa)
    {
        Reach = reach; Impressions = impressions; Cpm = cpm;
        Clicks = clicks; Cpc = cpc; Ctr = ctr;
        Conversions = conversions; Cpa = cpa;
    }
}

public static class ObjectiveWeights
{
    public static readonly Dictionary<string, MetricWeights> Weights = new(StringComparer.OrdinalIgnoreCase)
    {
        //                            reach  imp    cpm    clicks cpc    ctr    conv   cpa
        ["awareness"]  = new MetricWeights(0.35, 0.25, 0.20, 0.05, 0.05, 0.05, 0.00, 0.00),
        ["traffic"]    = new MetricWeights(0.05, 0.10, 0.10, 0.30, 0.30, 0.15, 0.00, 0.00),
        ["leads"]      = new MetricWeights(0.05, 0.05, 0.05, 0.15, 0.15, 0.10, 0.25, 0.20),
        ["sales"]      = new MetricWeights(0.05, 0.05, 0.05, 0.10, 0.10, 0.10, 0.30, 0.25),
    };

    /// <summary>Fallback: balanced weights if objective not recognized</summary>
    public static readonly MetricWeights Default =
        new(0.10, 0.10, 0.10, 0.20, 0.20, 0.10, 0.10, 0.10);

    public static MetricWeights For(string objective)
        => Weights.TryGetValue(objective, out var w) ? w : Default;
}