/**
 * Application Constants and Type Definitions
 *
 * Defines TypeScript interfaces for application state, pharmacokinetic parameters,
 * and default values. Central configuration for localStorage keys and conversion factors.
 *
 * @author Andreas Weyer
 * @license MIT
 */

export const LOCAL_STORAGE_KEY = 'medPlanAssistantState_v6';
export const LDX_TO_DAMPH_CONVERSION_FACTOR = 0.2948;

// Type definitions
export interface PkParams {
  damph: { halfLife: string };
  ldx: { halfLife: string; absorptionRate: string };
}

export interface DayDose {
  id: string;
  time: string;
  ldx: string;
  damph?: string; // Optional, kept for backwards compatibility but not used in UI
}

export interface DayGroup {
  id: string;
  isTemplate: boolean;
  doses: DayDose[];
}

export interface SteadyStateConfig {
  daysOnMedication: string;
}

export interface TherapeuticRange {
  min: string;
  max: string;
}

export interface UiSettings {
  showDayTimeOnXAxis: boolean;
  showTemplateDay: boolean;
  chartView: 'ldx' | 'damph' | 'both';
  yAxisMin: string;
  yAxisMax: string;
  simulationDays: string;
  displayedDays: string;
}

export interface AppState {
  pkParams: PkParams;
  days: DayGroup[];
  steadyStateConfig: SteadyStateConfig;
  therapeuticRange: TherapeuticRange;
  doseIncrement: string;
  uiSettings: UiSettings;
}

// Legacy interfaces for backwards compatibility (will be removed later)
export interface Dose {
  time: string;
  dose: string;
  label: string;
}

export interface Deviation extends Dose {
  dayOffset?: number;
  isAdditional: boolean;
}

export interface ConcentrationPoint {
  timeHours: number;
  ldx: number;
  damph: number;
}

// Default application state
export const getDefaultState = (): AppState => ({
  pkParams: {
    damph: { halfLife: '11' },
    ldx: { halfLife: '0.8', absorptionRate: '1.5' },
  },
  days: [
    {
      id: 'day-template',
      isTemplate: true,
      doses: [
        { id: 'dose-1', time: '06:30', ldx: '25' },
        { id: 'dose-2', time: '12:30', ldx: '10' },
        { id: 'dose-3', time: '17:00', ldx: '10' },
        { id: 'dose-4', time: '22:00', ldx: '10' },
      ]
    }
  ],
  steadyStateConfig: { daysOnMedication: '7' },
  therapeuticRange: { min: '10.5', max: '11.5' },
  doseIncrement: '2.5',
  uiSettings: {
    showDayTimeOnXAxis: true,
    showTemplateDay: false,
    chartView: 'both',
    yAxisMin: '0',
    yAxisMax: '16',
    simulationDays: '3',
    displayedDays: '2',
  }
});