helpers.hpp

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#pragma once
 
#include "kalshi/error.hpp"
#include "kalshi/fixed_point.hpp"
#include "kalshi/models.hpp"
 
#include <chrono>
#include <cstdint>
#include <string_view>
 
namespace kalshi {
 
[[nodiscard]] inline Result<std::int64_t> to_cents(std::string_view dollars) {
    Result<FixedPoint> value = FixedPoint::parse(dollars);
    if (!value) {
        return std::unexpected(std::move(value.error()));
    }
    return value->scaled_integer(2);
}
 
[[nodiscard]] inline Result<std::int64_t> to_contracts(std::string_view count) {
    Result<FixedPoint> value = FixedPoint::parse(count);
    if (!value) {
        return std::unexpected(std::move(value.error()));
    }
    return value->scaled_integer(0);
}
 
using Timestamp = std::chrono::sys_time<std::chrono::milliseconds>;
 
[[nodiscard]] Result<Timestamp> parse_timestamp(std::string_view text);
 
[[nodiscard]] constexpr OutcomeSide outcome_side(Side side, Action action) noexcept {
    if (side == Side::Unknown || action == Action::Unknown) {
        return OutcomeSide::Unknown;
    }
    const bool yes = (side == Side::Yes) == (action == Action::Buy);
    return yes ? OutcomeSide::Yes : OutcomeSide::No;
}
 
[[nodiscard]] constexpr BookSide book_side(Side side, Action action) noexcept {
    switch (outcome_side(side, action)) {
        case OutcomeSide::Yes:
            return BookSide::Bid;
        case OutcomeSide::No:
            return BookSide::Ask;
        case OutcomeSide::Unknown:
            break;
    }
    return BookSide::Unknown;
}
 
} // namespace kalshi