データ転送速度コンバーター

# Data Transfer Speed Converter
# Bits vs Bytes: 1 byte = 8 bits

def mbps_to_mbs(mbps: float) -> float:
    """Megabits/s → Megabytes/s (divide by 8)."""
    return mbps / 8

def mbs_to_mbps(mbs: float) -> float:
    """Megabytes/s → Megabits/s (multiply by 8)."""
    return mbs * 8

def gbps_to_tbh(gbps: float) -> float:
    """Gigabits/s → Terabytes/hour."""
    # 1 Gbps = 0.125 GB/s = 0.125 * 3600 GB/h = 450 GB/h = 0.439 TB/h
    gb_per_hour = gbps * 0.125 * 3600
    return gb_per_hour / 1024  # Convert GB to TB

def download_time_seconds(file_size_mb: float, speed_mbps: float) -> float:
    """Calculate download time given file size (MB) and connection speed (Mbps)."""
    speed_mbs = mbps_to_mbs(speed_mbps)
    return file_size_mb / speed_mbs

def format_time(seconds: float) -> str:
    if seconds < 60:
        return f"{seconds:.1f} seconds"
    elif seconds < 3600:
        return f"{seconds / 60:.1f} minutes"
    else:
        return f"{seconds / 3600:.2f} hours"

# Examples
speed_mbps = 100  # 100 Mbps connection

print(f"{speed_mbps} Mbps = {mbps_to_mbs(speed_mbps)} MB/s")
# 100 Mbps = 12.5 MB/s

# Download time for common file sizes
files = [
    ("1 GB movie", 1024),
    ("4 GB game", 4096),
    ("50 GB game", 51200),
]
for name, size_mb in files:
    t = download_time_seconds(size_mb, speed_mbps)
    print(f"  {name}: {format_time(t)}")
# 1 GB movie: 1.4 minutes
# 4 GB game: 5.5 minutes
# 50 GB game: 1.14 hours