basic module setup

src/utils/modifier-registry.ts

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+import type { Modifier, EstimateItem } from '../types';
+
+export interface ModifierModule {
+    id: string;
+    name: string;
+    description: string;
+    defaultLabel: string;
+    defaultValue: number;
+    defaultValueType: 'percent' | 'amount' | 'unit';
+    defaultUnitLabel?: string;
+    calculate: (modifier: Modifier, subScopeTotalWithMarkup: number, subScopeItems: EstimateItem[]) => number;
+    calculateDisplay?: (modifier: Modifier, subScopeTotalWithMarkup: number, subScopeItems: EstimateItem[]) => number;
+}
+
+const TaxModule: ModifierModule = {
+    id: 'tax',
+    name: 'Tax',
+    description: 'Calculates percentage tax on the sub-scope total.',
+    defaultLabel: 'Sales Tax',
+    defaultValue: 0,
+    defaultValueType: 'percent',
+    calculate: (m, base) => {
+        if (m.valueType === 'percent') return base * (m.value / 100);
+        return m.value;
+    }
+};
+
+const ManHoursModule: ModifierModule = {
+    id: 'man-hours',
+    name: 'Man-Hours',
+    description: 'Calculates estimated labor hours. Does not affect monetary total.',
+    defaultLabel: 'Estimated Hours',
+    defaultValue: 0,
+    defaultValueType: 'unit',
+    defaultUnitLabel: 'hrs',
+    calculate: () => 0,
+    calculateDisplay: (m, base) => {
+        if (m.valueType === 'percent') return base * (m.value / 100);
+        return m.value;
+    }
+};
+
+const SimpleAdjustmentModule: ModifierModule = {
+    id: 'adjustment',
+    name: 'Fixed adjustment',
+    description: 'Adds or subtracts a fixed amount or percentage.',
+    defaultLabel: 'Adjustment',
+    defaultValue: 0,
+    defaultValueType: 'amount',
+    calculate: (m, base) => {
+        if (m.valueType === 'percent') return base * (m.value / 100);
+        return m.value;
+    }
+};
+
+export const MODIFIER_MODULES: ModifierModule[] = [
+    TaxModule,
+    ManHoursModule,
+    SimpleAdjustmentModule
+];
+
+export const ModifierRegistry = {
+    getModule: (id: string) => MODIFIER_MODULES.find(m => m.id === id) || SimpleAdjustmentModule,
+    
+    calculate: (modifier: Modifier, baseTotal: number, items: EstimateItem[]) => {
+        const module = ModifierRegistry.getModule(modifier.moduleId);
+        return module.calculate(modifier, baseTotal, items);
+    },
+
+    calculateDisplay: (modifier: Modifier, baseTotal: number, items: EstimateItem[]) => {
+        const module = ModifierRegistry.getModule(modifier.moduleId);
+        if (module.calculateDisplay) return module.calculateDisplay(modifier, baseTotal, items);
+        return module.calculate(modifier, baseTotal, items);
+    }
+};