#ifndef INCLUDED_C_FLOAT_H
#define INCLUDED_C_FLOAT_H

#ifndef INCLUDED_C_TYPES_H
#include <c_Types.h>
#endif /*INCLUDED_C_TYPES_H*/

#ifndef INCLUDED_MATH_H
#define INCLUDED_MATH_H
#include <math.h>
#endif /*INCLUDED_MATH_H*/

#ifndef INCLUDED_FLOAT_H
#define INCLUDED_FLOAT_H
#include <float.h>
#endif /*INCLUDED_FLOAT_H*/


/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

typedef union {
    float f;
    uint32_t raw;
    struct {
        uint32_t fraction : 23; // 尾数 (M)
        uint32_t exponent : 8;  // 指数 (E)
        uint32_t sign     : 1;  // 符号位 (S)
    } parts;
} c_Float_t;

typedef union {
    double d;
    uint64_t raw;
    struct {
        uint64_t fraction : 52; // 尾数
        uint64_t exponent : 11; // 指数
        uint64_t sign     : 1;  // 符号
    } parts;
} c_Double_t;

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

// 32位单精度常量定义
#define C_FLOAT_SIGN_MASK     0x80000000U
#define C_FLOAT_EXP_MASK      0x7F800000U
#define C_FLOAT_FRAC_MASK     0x007FFFFFU
#define C_FLOAT_HIDDEN_BIT    0x00800000U // 隐藏的最高位1
#define C_FLOAT_EXP_BIAS      127

#define C_FLOAT_NEG_INF       0xFF800000U
#define C_FLOAT_POS_INF       0x7F800000U

// 快捷提取宏
#define C_FLOAT_GET_SIGN(u)         (((u) & C_FLOAT_SIGN_MASK) >> 31)
#define C_FLOAT_GET_EXP(u)          (((u) & C_FLOAT_EXP_MASK) >> 23)
#define C_FLOAT_GET_FRAC(u)         ((u) & C_FLOAT_FRAC_MASK)

#define C_DOUBLE_SIGN_MASK    0x8000000000000000ULL
#define C_DOUBLE_EXP_MASK     0x7FF0000000000000ULL
#define C_DOUBLE_FRAC_MASK    0x000FFFFFFFFFFFFFULL
#define C_DOUBLE_HIDDEN_BIT   0x0010000000000000ULL // 第52位（从0开始算）

#define C_DOUBLE_POS_INF      0x7FF0000000000000ULL
#define C_DOUBLE_NEG_INF      0xFFF0000000000000ULL

#define C_DOUBLE_GET_SIGN(u)         (((u) & C_DOUBLE_SIGN_MASK) >> 63)
#define C_DOUBLE_GET_EXP(u)          (((u) & C_DOUBLE_EXP_MASK) >> 52)
#define C_DOUBLE_GET_FRAC(u)         ((u) & C_DOUBLE_FRAC_MASK)

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

C_STATIC_FORCE_INLINE
uint32_t c_Float_Pack(const uint32_t sign, const uint32_t exp, const uint32_t frac) {
    return ((sign << 31) & C_FLOAT_SIGN_MASK) |
           ((exp << 23) & C_FLOAT_EXP_MASK)  |
           (frac & C_FLOAT_FRAC_MASK);
}

C_STATIC_FORCE_INLINE
int c_Float_IsNAN(uint32_t raw) {
    return ((raw & C_FLOAT_EXP_MASK) == C_FLOAT_EXP_MASK) && ((raw & C_FLOAT_FRAC_MASK) != 0);
}

C_STATIC_FORCE_INLINE
int c_Double_IsNAN(uint64_t raw) {
    return ((raw & C_DOUBLE_EXP_MASK) == C_DOUBLE_EXP_MASK) && ((raw & C_DOUBLE_FRAC_MASK) != 0);
}

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

uint32_t c_Float_Add(uint32_t a, uint32_t b);

uint32_t c_Float_Mul(uint32_t a, uint32_t b);

uint32_t c_Float_Div(uint32_t a, uint32_t b);

int c_Float_Cmp(uint32_t a, uint32_t b);

C_STATIC_FORCE_INLINE
uint32_t c_Float_Sub(uint32_t a, uint32_t b) {
    // 透過與 0x80000000 進行 XOR，直接將 b 的符號位元取反 (0->1, 1->0)
    // 隨後將 A - B 轉換為 A + (-B) 傳入加法器
    return c_Float_Add(a, b ^ C_FLOAT_SIGN_MASK);
}

C_STATIC_FORCE_INLINE
bool c_Float_IsZero(uint32_t raw) {
    // Strip away the sign bit; check if the remaining 31 bits are 0
    return (raw & ~C_FLOAT_SIGN_MASK) == 0U;
}

C_STATIC_FORCE_INLINE
bool c_Float_IsInf(uint32_t raw) {
    // Strip the sign bit and check if it exactly matches the exponent mask.
    // If any fraction bits were set, it would be a NaN instead of Infinity.
    return (raw & ~0x80000000U) == C_FLOAT_EXP_MASK;
}

/**
 * @brief Determines if the float is specifically Negative Infinity (-Inf).
 */
C_STATIC_FORCE_INLINE
bool c_Float_IsNegInf(uint32_t raw) {
    return raw == C_FLOAT_NEG_INF;
}

/**
 * @brief Determines if the float is specifically Positive Infinity (+Inf).
 */
C_STATIC_FORCE_INLINE
bool c_Float_IsPosInf(uint32_t raw) {
    return raw == C_FLOAT_POS_INF;
}

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

uint64_t c_Double_Pack(uint32_t sign, int32_t exp, uint64_t frac64);

int c_Double_Cmp(uint64_t a, uint64_t b);

uint64_t c_Double_Add(uint64_t a, uint64_t b);

C_STATIC_FORCE_INLINE
uint64_t c_Double_Sub(uint64_t a, uint64_t b) {
    // A - B == A + (-B)
    return c_Double_Add(a, b ^ C_DOUBLE_SIGN_MASK);
}

uint64_t c_Double_Mul(uint64_t a, uint64_t b);

uint64_t c_Double_Div(uint64_t a, uint64_t b);


C_STATIC_FORCE_INLINE
bool c_Double_IsZero(const uint64_t raw) {
    // Strip away the sign bit; check if the remaining 63 bits are 0
    return (raw & ~C_DOUBLE_SIGN_MASK) == 0ULL;
}

C_STATIC_FORCE_INLINE
bool c_Double_IsInf(uint64_t raw) {
    // Strip the sign bit and check if it exactly matches the exponent mask.
    // If any fraction bits were set, it would be a NaN instead of Infinity.
    return (raw & ~C_DOUBLE_SIGN_MASK) == C_DOUBLE_EXP_MASK;
}

/**
 * @brief Determines if the double is specifically Negative Infinity (-Inf).
 */
C_STATIC_FORCE_INLINE
bool c_Double_IsNegInf(uint64_t raw) {
    return raw == C_DOUBLE_NEG_INF;
}

/**
 * @brief Determines if the double is specifically Positive Infinity (+Inf).
 */
C_STATIC_FORCE_INLINE
bool c_Double_IsPosInf(uint64_t raw) {
    return raw == C_DOUBLE_POS_INF;
}

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

C_STATIC_FORCE_INLINE
int c_float_cmp(const float a, const float b) {
    c_Float_t va;
    c_Float_t vb;
    va.f = a;
    vb.f = b;
    return c_Float_Cmp(va.raw, vb.raw);
}

C_STATIC_FORCE_INLINE
int c_double_cmp(const double a, const double b) {
    c_Double_t va;
    c_Double_t vb;
    va.d = a;
    vb.d = b;
    return c_Double_Cmp(va.raw, vb.raw);
}



#endif /*INCLUDED_C_FLOAT_H*/