#include <gtest/gtest.h>

#include "uint256_t.h"

TEST(BitShift, left){
    // operator<<
    uint256_t val(0x1);
    uint64_t exp_val = 1;
    for(uint8_t i = 0; i < 64; i++){
        EXPECT_EQ(val << i, exp_val << i);
    }

    uint256_t zero(0);
    for(uint8_t i = 0; i < 64; i++){
        EXPECT_EQ(zero << i, 0);
    }

    // operator<<=
    for(uint8_t i = 0; i < 63; i++){ // 1 is already a bit
        EXPECT_EQ(val  <<= 1, exp_val <<= 1);
    }

    for(uint8_t i = 0; i < 63; i++){
        EXPECT_EQ(zero <<= 1, 0);
    }
}

TEST(External, shift_left){
    bool      t    = true;
    bool      f    = false;
    uint8_t   u8   = 0xffULL;
    uint16_t  u16  = 0xffffULL;
    uint32_t  u32  = 0xffffffffULL;
    uint64_t  u64  = 0xffffffffffffffffULL;
    uint128_t u128  (0xffffffffffffffffULL, 0xffffffffffffffffULL);

    const uint256_t zero(0);
    const uint256_t one(1);

    EXPECT_EQ(t    << zero, t);
    EXPECT_EQ(f    << zero, f);
    EXPECT_EQ(u8   << zero, u8);
    EXPECT_EQ(u16  << zero, u16);
    EXPECT_EQ(u32  << zero, u32);
    EXPECT_EQ(u64  << zero, u64);
    EXPECT_EQ(u128 << zero, u128);

    EXPECT_EQ(t    <<= zero, t);
    EXPECT_EQ(f    <<= zero, f);
    EXPECT_EQ(u8   <<= zero, u8);
    EXPECT_EQ(u16  <<= zero, u16);
    EXPECT_EQ(u32  <<= zero, u32);
    EXPECT_EQ(u64  <<= zero, u64);
    EXPECT_EQ(u128 <<= zero, u128);

    EXPECT_EQ(t    << one, uint256_t(t)    << 1);
    EXPECT_EQ(f    << one, uint256_t(f)    << 1);
    EXPECT_EQ(u8   << one, uint256_t(u8)   << 1);
    EXPECT_EQ(u16  << one, uint256_t(u16)  << 1);
    EXPECT_EQ(u32  << one, uint256_t(u32)  << 1);
    EXPECT_EQ(u64  << one, uint256_t(u64)  << 1);
    EXPECT_EQ(u128 << one, uint256_t(u128) << 1);

    EXPECT_EQ(t    <<= one, true);
    EXPECT_EQ(f    <<= one, false);
    EXPECT_EQ(u8   <<= one, (uint8_t)  0xfeULL);
    EXPECT_EQ(u16  <<= one, (uint16_t) 0xfffeULL);
    EXPECT_EQ(u32  <<= one, (uint32_t) 0xfffffffeULL);
    EXPECT_EQ(u64  <<= one, (uint64_t) 0xfffffffffffffffeULL);
    EXPECT_EQ(u128 <<= one, uint128_t (0xffffffffffffffffULL, 0xfffffffffffffffeULL));

    EXPECT_EQ(u8   << uint256_t(7),   uint256_t(0x7f00ULL));
    EXPECT_EQ(u16  << uint256_t(15),  uint256_t(0x7fff0000ULL));
    EXPECT_EQ(u32  << uint256_t(31),  uint256_t(0x7fffffff00000000ULL));
    EXPECT_EQ(u64  << uint256_t(63),  uint256_t(0x0000000000000000ULL, 0x0000000000000000ULL, 0x7fffffffffffffffULL, 0x0000000000000000ULL));
    EXPECT_EQ(u128 << uint256_t(127), uint256_t(0x7fffffffffffffffULL, 0xffffffffffffffffULL, 0x0000000000000000ULL, 0x0000000000000000ULL));

    EXPECT_EQ(u8   <<= uint256_t(7),   (uint8_t)   0);
    EXPECT_EQ(u16  <<= uint256_t(15),  (uint16_t)  0);
    EXPECT_EQ(u32  <<= uint256_t(31),  (uint32_t)  0);
    EXPECT_EQ(u64  <<= uint256_t(63),  (uint64_t)  0);
    EXPECT_EQ(u128 <<= uint256_t(127), (uint128_t) 0);
}