/**
 * This fake database generates and returns randomised data of objects with time, price and quantity. If you are a
 * frontend developer you can safely ignore this part of the example.
 */
export const Database = {
  get: () => data,
};

export const minute = 1000 * 60;
export const hour = minute * 60;
export const day = hour * 24;
export const week = day * 7;
export const month = day * 30;

export const dataStart = new Date("2019-01-01 00:00:00").getTime();
export const dataEnd = new Date("2024-12-30 23:59:59").getTime();

let seed = 1;
function random() {
  seed = (seed * 16807) % 2147483647;
  return (seed - 1) / 2147483646;
}

// Generate data for the fake database
const data: Array<Datum> = [];
for (let time = dataStart; time < dataEnd; time += hour) {
  let price;
  if (data.length === 0) {
    price = 1000 + random() * 100;
  } else if (data.length < 5) {
    price = data[data.length - 1].price + random() * 20 - 10;
  } else {
    // Take the average to ensure the coarser data doesn't fluctuate too much
    const avg =
      data.slice(data.length - 5).reduce((a, v) => a + v.price, 0) / 5;
    price = avg + (random() * 50 - 25);
  }
  data.push({ time, price });
}

export type Datum = { time: number; price: number };