gen_grid.php

<?php

function gen_grid(float $total_value, float $total_amount,
		  int $nr_sell_grid, float $sell_percent_interval,
		  float $sell_percent_init_margin,
		  float $total_prep_value, int $nr_buy_grid,
		  float $buy_percent_interval, float $buy_percent_init_margin)
{
	$sell_lines = [];
	$avg_price = $total_value / $total_amount;

	if ($total_value > 0 && $total_amount > 0 && $nr_sell_grid > 0) {

		$pos_amt = $total_amount;
		$out_acc = 0;
		$tmp_total_amount = $total_amount;
		$sell_interval = $sell_percent_interval / 100;
		$sell_amount_per_line = round($total_amount / $nr_sell_grid);
		$price_to_sell = $avg_price + ($avg_price * ($sell_percent_init_margin / 100));

		for ($i = 0; $i < $nr_sell_grid; $i++) {
			$amount_to_sell = min($sell_amount_per_line, $tmp_total_amount);

			$out_val = $price_to_sell * $amount_to_sell;
			$tmp_total_amount -= $amount_to_sell;
			$out_acc += $out_val;
			$pos_amt -= $amount_to_sell;

			$sell_lines[] = [
				"price"    => $price_to_sell,
				"amount"   => $amount_to_sell,
				"pos_amt"  => $pos_amt,
				"out_val"  => $out_val,
				"out_acc"  => $out_acc,
				"per_favg" => (($price_to_sell - $avg_price) / $avg_price) * 100
			];

			$price_to_sell += $price_to_sell * $sell_interval;
			if ($tmp_total_amount <= 0)
				break;
		}
	}

	$buy_lines = [];
	if ($total_prep_value > 0 && $nr_buy_grid > 0) {

		$amt_acc = 0;
		$spend_acc = 0;
		$buy_interval = $buy_percent_interval / 100;
		$spend_per_line = $total_prep_value / $nr_buy_grid;
		$price_to_buy = $avg_price - ($avg_price * ($buy_percent_init_margin / 100));

		for ($i = 0; $i < $nr_buy_grid; $i++) {
			$amount_to_buy = $spend_per_line / $price_to_buy;
			$spend_acc += $spend_per_line;
			$amt_acc += $amount_to_buy;

			$buy_lines[] = [
				"price"     => $price_to_buy,
				"amount"    => $amount_to_buy,
				"spend"     => $spend_per_line,
				"spend_acc" => $spend_acc,
				"amt_acc"   => $amt_acc,
				"per_favg"  => (($price_to_buy - $avg_price) / $avg_price) * 100,
			];

			$price_to_buy -= $price_to_buy * $buy_interval;
		}
	}

	return [
		"sell_lines" => $sell_lines,
		"buy_lines"  => $buy_lines
	];
}

$total_usdt               = 398;
$total_mew                = 74127;
$nr_sell_grid             = 12;
$sell_percent_interval    = 1;
$sell_percent_init_margin = 10;

$total_prep_usdt          = 100;
$nr_buy_grid              = 10;
$buy_percent_interval     = 1;
$buy_percent_init_margin  = 10;

$ret = gen_grid($total_usdt, $total_mew,
		$nr_sell_grid, $sell_percent_interval,
		$sell_percent_init_margin,
		$total_prep_usdt, $nr_buy_grid,
		$buy_percent_interval,
		$buy_percent_init_margin);

foreach ($ret["sell_lines"] as $key => $grid) {
	printf("p = %.6f; amt = %.2f; out = %.2f; out_acc = %.2f; per_favg = %.2f; pos_amt = %.2f;\n",
		$grid["price"], $grid["amount"], $grid["out_val"],
		$grid["out_acc"], $grid["per_favg"], $grid["pos_amt"]);
}

printf("\n================================================================================\n\n");

foreach ($ret["buy_lines"] as $key => $grid) {
	printf("p = %.6f; amt = %.2f; spend = %.2f; spend_acc = %.2f; per_favg = %.2f; amt_acc = %.2f;\n",
		$grid["price"], $grid["amount"], $grid["spend"],
		$grid["spend_acc"], $grid["per_favg"], $grid["amt_acc"]);
}