import { v4 as uuidv4 } from 'uuid';

export interface WeightedOption<T> {
  value: T;
  weight: number;
}

export function weightedRandom<T>(options: WeightedOption<T>[]): T {
  const totalWeight = options.reduce((sum, opt) => sum + opt.weight, 0);
  let random = Math.random() * totalWeight;

  for (const option of options) {
    random -= option.weight;
    if (random <= 0) {
      return option.value;
    }
  }

  return options[options.length - 1].value;
}

export function randomInt(min: number, max: number): number {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

export function randomFloat(min: number, max: number): number {
  return Math.random() * (max - min) + min;
}

export function pickRandom<T>(array: T[]): T {
  return array[Math.floor(Math.random() * array.length)];
}

export function shuffleArray<T>(array: T[]): T[] {
  const result = [...array];
  for (let i = result.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [result[i], result[j]] = [result[j], result[i]];
  }
  return result;
}

export function uuid(): string {
  return uuidv4();
}

export function generateDatesBetween(startDate: Date, endDate: Date): Date[] {
  const dates: Date[] = [];
  const current = new Date(startDate);
  current.setHours(0, 0, 0, 0);

  while (current <= endDate) {
    dates.push(new Date(current));
    current.setDate(current.getDate() + 1);
  }

  return dates;
}

export function addHours(date: Date, hours: number): Date {
  return new Date(date.getTime() + hours * 60 * 60 * 1000);
}

export function addMinutes(date: Date, minutes: number): Date {
  return new Date(date.getTime() + minutes * 60 * 1000);
}

export function addSeconds(date: Date, seconds: number): Date {
  return new Date(date.getTime() + seconds * 1000);
}

export function subDays(date: Date, days: number): Date {
  return new Date(date.getTime() - days * 24 * 60 * 60 * 1000);
}

export function formatNumber(num: number): string {
  return num.toLocaleString();
}

export function progressBar(current: number, total: number, width = 30): string {
  const percent = current / total;
  const filled = Math.round(width * percent);
  const empty = width - filled;
  return `[${'█'.repeat(filled)}${'░'.repeat(empty)}] ${Math.round(percent * 100)}%`;
}