Primera build enviada

PortfolioJournal/Models/InvestmentMetrics.swift

@@ -201,3 +201,49 @@ struct PortfolioSummary {
         )
     }
 }
+
+// MARK: - Portfolio Forecast
+
+struct PortfolioForecast {
+    let currentValue: Decimal
+    let forecastValue: Decimal
+    let forecastDate: Date
+    let confidenceLower: Decimal
+    let confidenceUpper: Decimal
+    let monthlyGrowthRate: Decimal
+    let annualizedGrowthRate: Decimal
+
+    var formattedForecastValue: String {
+        CurrencyFormatter.format(forecastValue, style: .currency, maximumFractionDigits: 0)
+    }
+
+    var formattedCurrentValue: String {
+        CurrencyFormatter.format(currentValue, style: .currency, maximumFractionDigits: 0)
+    }
+
+    var formattedConfidenceRange: String {
+        let lower = CurrencyFormatter.format(confidenceLower, style: .currency, maximumFractionDigits: 0)
+        let upper = CurrencyFormatter.format(confidenceUpper, style: .currency, maximumFractionDigits: 0)
+        return "\(lower) – \(upper)"
+    }
+
+    var formattedForecastDate: String {
+        forecastDate.monthYearString
+    }
+
+    var formattedGrowthPercentage: String {
+        guard currentValue > 0 else { return "+0%" }
+        let growthPct = ((forecastValue - currentValue) / currentValue) * 100
+        let prefix = growthPct >= 0 ? "+" : ""
+        return String(format: "\(prefix)%.1f%%", NSDecimalNumber(decimal: growthPct).doubleValue)
+    }
+
+    var formattedAnnualizedGrowthRate: String {
+        let prefix = annualizedGrowthRate >= 0 ? "+" : ""
+        return String(format: "\(prefix)%.1f%%", NSDecimalNumber(decimal: annualizedGrowthRate * 100).doubleValue)
+    }
+
+    var isPositiveGrowth: Bool {
+        forecastValue >= currentValue
+    }
+}