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#include <stdio.h>
#include <stdlib.h>

/**
 * homogenous strategy prototyping
 * two types of orders, market and limit.
 * strategy has target item, compares to the price,
 * then picks action
 */

typedef size_t PID;

typedef enum {
  COMP_LT,
  COMP_EQ,
  COMP_GT
} Comp;

typedef enum {
  ORDER_SELL_M,
  ORDER_SELL_L,
  ORDER_BUY_M,
  ORDER_BUY_L
} Order;

typedef struct {
  PID customer;
  PID item;
  Comp op;
  double amount;
  double cprice;
  Order act;
  double lprice; // not used for market orders.
} Strategy;

size_t Strategy_max_orders(const Strategy* sts, PID item, size_t n, int isbuy)
{
  size_t total = 0;
  const Strategy* endptr = sts + n;
  while(sts != endptr) {
    if (sts->item == item) {
      switch (sts->act) {
        case ORDER_BUY_L:
        case ORDER_BUY_M:
             if (isbuy) ++total;
             break;
        case ORDER_SELL_L:
        case ORDER_SELL_M:
             if (!isbuy) ++total;
             break;
      }
    }
    ++sts;
  }
  return total;
}

int main(void) {
  printf("Hello World\n");
  return 0;
}