import { ICalendarConfig } from './ICalendarConfig';
import { IGridSettings } from './GridSettings';
import { IDateViewSettings } from './DateViewSettings';
import { ITimeFormatConfig } from './TimeFormatConfig';
import { IWorkWeekSettings } from './WorkWeekSettings';
import { CalendarView } from '../types/CalendarTypes';

/**
 * All-day event layout constants
 */
export const ALL_DAY_CONSTANTS = {
  EVENT_HEIGHT: 22,
  EVENT_GAP: 2,
  CONTAINER_PADDING: 4,
  MAX_COLLAPSED_ROWS: 4,
  get SINGLE_ROW_HEIGHT() {
    return this.EVENT_HEIGHT + this.EVENT_GAP; // 28px
  }
} as const;

/**
 * Work week presets - Configuration data
 */
export const WORK_WEEK_PRESETS: { [key: string]: IWorkWeekSettings } = {
  'standard': {
    id: 'standard',
    workDays: [1, 2, 3, 4, 5],
    totalDays: 5,
    firstWorkDay: 1
  },
  'compressed': {
    id: 'compressed',
    workDays: [1, 2, 3, 4],
    totalDays: 4,
    firstWorkDay: 1
  },
  'midweek': {
    id: 'midweek',
    workDays: [3, 4, 5],
    totalDays: 3,
    firstWorkDay: 3
  },
  'weekend': {
    id: 'weekend',
    workDays: [6, 7],
    totalDays: 2,
    firstWorkDay: 6
  },
  'fullweek': {
    id: 'fullweek',
    workDays: [1, 2, 3, 4, 5, 6, 7],
    totalDays: 7,
    firstWorkDay: 1
  }
};

/**
 * Configuration - DTO container for all configuration
 * Pure data object loaded from JSON via ConfigManager
 */
export class Configuration {
  private static _instance: Configuration | null = null;

  public config: ICalendarConfig;
  public gridSettings: IGridSettings;
  public dateViewSettings: IDateViewSettings;
  public timeFormatConfig: ITimeFormatConfig;
  public currentWorkWeek: string;
  public currentView: CalendarView;
  public selectedDate: Date;
  public apiEndpoint: string = '/api';

  constructor(
    config: ICalendarConfig,
    gridSettings: IGridSettings,
    dateViewSettings: IDateViewSettings,
    timeFormatConfig: ITimeFormatConfig,
    currentWorkWeek: string,
    currentView: CalendarView,
    selectedDate: Date = new Date()
  ) {
    this.config = config;
    this.gridSettings = gridSettings;
    this.dateViewSettings = dateViewSettings;
    this.timeFormatConfig = timeFormatConfig;
    this.currentWorkWeek = currentWorkWeek;
    this.currentView = currentView;
    this.selectedDate = selectedDate;

    // Store as singleton instance for web components
    Configuration._instance = this;
  }

  /**
   * Get the current Configuration instance
   * Used by web components that can't use dependency injection
   */
  public static getInstance(): Configuration {
    if (!Configuration._instance) {
      throw new Error('Configuration has not been initialized. Call ConfigManager.load() first.');
    }
    return Configuration._instance;
  }

  setSelectedDate(date: Date): void {
    this.selectedDate = date;
  }

  getWorkWeekSettings(): IWorkWeekSettings {
    return WORK_WEEK_PRESETS[this.currentWorkWeek] || WORK_WEEK_PRESETS['standard'];
  }
}

// Backward compatibility alias
export { Configuration as CalendarConfig };