import os

FONT_FILE = "/Users/jeremygan/Desktop/python_dev/epaper2/websocket_server/GB2312-16.bin"

def test_font():
    if not os.path.exists(FONT_FILE):
        print(f"Error: File not found at {FONT_FILE}")
        return

    file_size = os.path.getsize(FONT_FILE)
    print(f"Font file size: {file_size} bytes")
    
    # Expected size for GB2312-16 (94x94 chars * 32 bytes)
    expected_size = 94 * 94 * 32
    print(f"Expected size: {expected_size} bytes")
    
    if file_size != expected_size:
        print(f"Warning: File size mismatch! (Diff: {file_size - expected_size})")

    # Try to render '中' (0xD6D0)
    # Area: 0xD6 - 0xA0 = 54
    # Index: 0xD0 - 0xA0 = 48
    area = 0xD6 - 0xA0
    index = 0xD0 - 0xA0
    offset = ((area - 1) * 94 + (index - 1)) * 32
    
    print(f"Testing character '中' (0xD6D0)")
    print(f"Area: {area}, Index: {index}, Offset: {offset}")
    
    with open(FONT_FILE, "rb") as f:
        f.seek(offset)
        data = f.read(32)
        
        if len(data) != 32:
            print("Error: Could not read 32 bytes")
            return
            
        print("Bitmap data:")
        for i in range(16):
            # Each row is 2 bytes (16 bits)
            byte1 = data[i*2]
            byte2 = data[i*2+1]
            
            # Print as bits
            line = ""
            for b in range(8):
                if (byte1 >> (7-b)) & 1: line += "##"
                else: line += ".."
            for b in range(8):
                if (byte2 >> (7-b)) & 1: line += "##"
                else: line += ".."
            print(line)

if __name__ == "__main__":
    test_font()