import evdev,sys
import pandas as pd
from socket import *
import time

NULL_CHAR = chr(0)
zero = NULL_CHAR*8
serHost = '192.168.0.111'
serPort = 50009

data = pd.read_csv("./scan-code.csv")
list = data.values.tolist()

def read_line(code):
	code_hex = code.replace("0x","")
	#print("code_hex=",code_hex)
	for i in range(len(list)):
		lkc = str(list[i][2])
		if lkc[-1] == "0":
			if code_hex ==  lkc.replace("0x00",""):
				return int(list[i][0].replace("0x07 0x00",""),16)
		else:
			if code_hex ==  lkc[lkc.rfind("0")+1:]:
				return int(list[i][0].replace("0x07 0x00",""),16)

def send_report(report):
	sockobj.send(report.encode())

print(zero.encode())

sockobj = socket(AF_INET, SOCK_STREAM)
sockobj.connect((serHost,serPort))
sockobj.send(b'hid open')
data = sockobj.recv(1024)
print(data)


time.sleep(5)
while True:
	for i in range(4,34):
		send_report(NULL_CHAR*2+chr(i)+NULL_CHAR*5)
		data = sockobj.recv(1024)
		print(data)
		send_report(NULL_CHAR*8)
		data = sockobj.recv(1024)
		i = i+1
		if i == 35:
			i = 4
			send_report(NULL_CHAR*2+chr(40)+NULL_CHAR*5)
			data = sockobj.recv(1024)
			print(data)
			send_report(NULL_CHAR*8)
			data = sockobj.recv(1024)
	time.sleep(0.1)

device = evdev.InputDevice('/dev/input/event1')

print(device)
tmp = 0
tmp_code = 0
hang = 0
caps = 0
for event in device.read_loop():
	if event.type == evdev.ecodes.EV_KEY :          
		k = evdev.events.KeyEvent(event)

		#print(k) #完整事件
		#print(event.code) ##键盘code --按键的hex code(如28---enter)
		hid_code = read_line(hex(event.code))
		#print("hid_code=",hid_code)##完成scan code到hid code的转换
		#print("hid_code_type=",type(hid_code))
		#print(event.value) ##键盘状态 0，1,2 --0为release, 1为down , 2hold

		if event.value == 1:
			#print(NULL_CHAR*2+chr(event.code)+NULL_CHAR*5)
			if hid_code == 224 or hid_code == 225 or hid_code == 226 or hid_code == 227 or hid_code == 228 or hid_code == 229 or hid_code == 230 or hid_code == 231 or hid_code == 58:
				tmp_code = hid_code
				hang = 1
				match hid_code:
					case 224:
						tmp = 1
					case 225:
						tmp = 2
					case 226:
						tmp = 4
					case 227:
						tmp = 8					
					case 228:
						tmp = 16
					case 229:
						tmp = 32
					case 230:
						tmp = 64
					case 231:
						tmp = 128
					case 58:
						if caps == 1:
							caps = 0
						else:
							caps = 1
						hang = 0
						tmp_code = 0
			else:
				if tmp != 0:    ##按住ctrl等然后按字母等
					hang = 2	##可以认定为没有单次敲击shift
					print("caps=",caps)
					if caps == 1 and (tmp_code == 225 or tmp_code == 229):
						send_report(NULL_CHAR*2+chr(hid_code)+NULL_CHAR*5)
					else:
						send_report(chr(tmp)+NULL_CHAR+chr(hid_code)+NULL_CHAR*5)
				else:
					if caps == 1 :
						send_report(chr(32)+NULL_CHAR+chr(hid_code)+NULL_CHAR*5)
					else:
						send_report(NULL_CHAR*2+chr(hid_code)+NULL_CHAR*5)
					data = sockobj.recv(1024)
					#print(data)

		if event.value == 2:
			#print(NULL_CHAR*2+chr(event.code)+NULL_CHAR*5)
			if hid_code == 224 or hid_code == 225 or hid_code == 226 or hid_code == 227 or hid_code == 228 or hid_code == 229 or hid_code == 230 or hid_code == 231 :
				tmp_code = hid_code
				match hid_code:
					case 224:
						tmp = 1
					case 225:
						tmp = 2
					case 226:
						tmp = 4
					case 227:
						tmp = 8					
					case 228:
						tmp = 16
					case 229:
						tmp = 32
					case 230:
						tmp = 64
					case 231:
						tmp = 128
			else:
				if tmp != 0:
					hang = 2
					if caps == 1 and (tmp_code == 225 or tmp_code == 229):
						send_report(NULL_CHAR*2+chr(hid_code)+NULL_CHAR*5)
					else:
						send_report(chr(tmp)+NULL_CHAR+chr(hid_code)+NULL_CHAR*5)
				else:
					if caps == 1 :
						send_report(chr(32)+NULL_CHAR+chr(hid_code)+NULL_CHAR*5)
						data = sockobj.recv(1024)
						#print(data)
					else:
						send_report(NULL_CHAR*2+chr(hid_code)+NULL_CHAR*5)
						data = sockobj.recv(1024)
						#print(data)

		if event.value == 0:
			if hid_code == tmp_code and hang == 1:
				send_report(chr(tmp)+NULL_CHAR*7)
				send_report(NULL_CHAR*8)
				tmp = 0
				tmp_code = 0
				hang = 0
			elif hid_code == tmp_code:
				send_report(NULL_CHAR*8)
				tmp = 0
				tmp_code = 0
				hang = 0				
			else:
				send_report(NULL_CHAR*8)
			data = sockobj.recv(1024)
			#print(data)
'''
This article provided the answer. 

Input reports (sent from keyboard to computer) have the following structure for a total of 8 bytes:

1 byte: modifier keys (Control, Shift, Alt, etc.), where each bit corresponds to a key
1 byte: unused/reserved for OEM
6 bytes: pressed key codes
Further into the article, there is a list of the modifiers, each represented by a bit:

Left Control: 224 (0x00e0)-------0x01
Left Shift: 225 (0x00e1)-------0x02
Left Alt: 226 (0x00e2)-------0x04
Left Meta (Windows key): 227 (0x00e3)-------0x08
Right Control: 228 (0x00e4)-------0x10
Right Shift: 229 (0x00e5)-------0x20
Right Alt: 230 (0x00e6)-------0x40
Right Meta (Windows key): 231 (0x00e7)-------0x80

For firing my screenshot app, I need CMD-SHIFT-5, so I need to set the 2nd and 4th bits on.
0b01010000
'''