#ifndef BETTERSTL_BIG_DECIMAL_H
#define BETTERSTL_BIG_DECIMAL_H

#include <string>
#include <bstl/big_integer.hpp>

namespace bstl {
    class BigDecimal {
public:
    BigDecimal();
    BigDecimal(int value);
    BigDecimal(long long value);
    BigDecimal(double value);
    explicit BigDecimal(const std::string& value);
    explicit BigDecimal(const char* value);
    BigDecimal(const BigInteger& unscaledValue, int scale);
    BigDecimal(const BigDecimal& other) = default;
    BigDecimal& operator=(const BigDecimal& other) = default;

    bool isZero() const;
    int sign() const;
    int getScale() const;
    BigInteger getUnscaledValue() const;
    std::string toString() const;

    // Comparison operators
    bool operator==(const BigDecimal& other) const;
    bool operator!=(const BigDecimal& other) const;
    bool operator<(const BigDecimal& other) const;
    bool operator>(const BigDecimal& other) const;
    bool operator<=(const BigDecimal& other) const;
    bool operator>=(const BigDecimal& other) const;

    bool operator==(int value) const;
    bool operator!=(int value) const;
    bool operator<(int value) const;
    bool operator>(int value) const;
    bool operator<=(int value) const;
    bool operator>=(int value) const;

    bool operator==(double value) const;
    bool operator!=(double value) const;
    bool operator<(double value) const;
    bool operator>(double value) const;
    bool operator<=(double value) const;
    bool operator>=(double value) const;

    // Arithmetic operators
    BigDecimal operator+() const;
    BigDecimal operator-() const;
    BigDecimal& operator+=(const BigDecimal& other);
    BigDecimal& operator-=(const BigDecimal& other);
    BigDecimal& operator*=(const BigDecimal& other);
    BigDecimal& operator/=(const BigDecimal& other);

    BigDecimal operator+(const BigDecimal& other) const;
    BigDecimal operator-(const BigDecimal& other) const;
    BigDecimal operator*(const BigDecimal& other) const;
    BigDecimal operator/(const BigDecimal& other) const;

    BigDecimal abs() const;
    BigDecimal round(int scale) const;

private:
    BigInteger unscaledValue_;  // 去掉小数点后的值
    int scale_;                 // 小数点后的位数

    static void alignScale(BigInteger& lhs, int& lhsScale,
                          BigInteger& rhs, int& rhsScale);
};

} // namespace bstl

#endif //BETTERSTL_BIG_DECIMAL_H