import math, copy

from liteeth.common import *
from liteeth.test.common import *

from liteeth.test.model import udp

def print_etherbone(s):
	print_with_prefix(s, "[ETHERBONE]")

# Etherbone model
class EtherboneWrite:
	def __init__(self, data):
		self.data = data

	def __repr__(self):
		return "WR32 0x{:08x}".format(self.data)

class EtherboneRead:
	def __init__(self, addr):
		self.addr = addr

	def __repr__(self):
		return "RD32 @ 0x{:08x}".format(self.addr)

class EtherboneWrites(Packet):
	def __init__(self, init=[], base_addr=0):
		Packet.__init__(self, init)
		self.base_addr = base_addr
		self.writes = []
		self.encoded = init != []

	def add(self, write):
		self.writes.append(write)

	def encode(self):
		if self.encoded:
			raise ValueError
		for byte in split_bytes(self.base_addr, 4):
			self.append(byte)
		for write in self.writes:
			for byte in split_bytes(write.data, 4):
				self.append(byte)
		self.encoded = True

	def decode(self):
		if not self.encoded:
			raise ValueError
		base_addr = []
		for i in range(4):
			base_addr.append(self.pop(0))
		self.base_addr = merge_bytes(base_addr)
		self.writes = []
		while len(self) != 0:
			write = []
			for i in range(4):
				write.append(self.pop(0))
			self.writes.append(EtherboneWrite(merge_bytes(write)))
		self.encoded = False

	def __repr__(self):
		r = "Writes\n"
		r += "--------\n"
		r += "BaseAddr @ 0x{:08x}\n".format(self.base_addr)
		for write in self.writes:
			r += write.__repr__() + "\n"
		return r

class EtherboneReads(Packet):
	def __init__(self, init=[], base_ret_addr=0):
		Packet.__init__(self, init)
		self.base_ret_addr = base_ret_addr
		self.reads = []
		self.encoded = init != []

	def add(self, read):
		self.reads.append(read)

	def encode(self):
		if self.encoded:
			raise ValueError
		for byte in split_bytes(self.base_ret_addr, 4):
			self.append(byte)
		for read in self.reads:
			for byte in split_bytes(read.addr, 4):
				self.append(byte)
		self.encoded = True

	def decode(self):
		if not self.encoded:
			raise ValueError
		base_ret_addr = []
		for i in range(4):
			base_ret_addr.append(self.pop(0))
		self.base_ret_addr = merge_bytes(base_ret_addr)
		self.reads = []
		while len(self) != 0:
			read = []
			for i in range(4):
				read.append(self.pop(0))
			self.reads.append(EtherboneRead(merge_bytes(read)))
		self.encoded = False

	def __repr__(self):
		r = "Reads\n"
		r += "--------\n"
		r += "BaseRetAddr @ 0x{:08x}\n".format(self.base_ret_addr)
		for read in self.reads:
			r += read.__repr__() + "\n"
		return r

class EtherboneRecord(Packet):
	def __init__(self, init=[]):
		Packet.__init__(self, init)
		self.writes = None
		self.reads = None
		self.encoded = init != []

	def get_writes(self):
		if self.wcount == 0:
			return None
		else:
			writes = []
			for i in range((self.wcount+1)*4):
				writes.append(self.pop(0))
			return EtherboneWrites(writes)

	def get_reads(self):
		if self.rcount == 0:
			return None
		else:
			reads = []
			for i in range((self.rcount+1)*4):
				reads.append(self.pop(0))
			return EtherboneReads(reads)

	def decode(self):
		if not self.encoded:
			raise ValueError
		header = []
		for byte in self[:etherbone_record_header_len]:
			header.append(self.pop(0))
		for k, v in sorted(etherbone_record_header.items()):
			setattr(self, k, get_field_data(v, header))
		self.writes = self.get_writes()
		if self.writes is not None:
			self.writes.decode()
		self.reads = self.get_reads()
		if self.reads is not None:
			self.reads.decode()
		self.encoded = False

	def set_writes(self, writes):
		self.wcount = len(writes.writes)
		writes.encode()
		for byte in writes:
			self.append(byte)

	def set_reads(self, reads):
		self.rcount = len(reads.reads)
		reads.encode()
		for byte in reads:
			self.append(byte)

	def encode(self):
		if self.encoded:
			raise ValueError
		if self.writes is not None:
			self.set_writes(self.writes)
		if self.reads is not None:
			self.set_reads(self.reads)
		header = 0
		for k, v in sorted(etherbone_record_header.items()):
			value = merge_bytes(split_bytes(getattr(self, k), math.ceil(v.width/8)), "little")
			header += (value << v.offset+(v.byte*8))
		for d in split_bytes(header, etherbone_record_header_len):
			self.insert(0, d)
		self.encoded = True

	def __repr__(self, n=0):
		r = "Record {}\n".format(n)
		r += "--------\n"
		if self.encoded:
			for d in self:
				r += "{:02x}".format(d)
		else:
			for k in sorted(etherbone_record_header.keys()):
				r += k + " : 0x{:0x}\n".format(getattr(self,k))
			if self.wcount != 0:
				r += self.writes.__repr__()
			if self.rcount != 0:
				r += self.reads.__repr__()
		return r

class EtherbonePacket(Packet):
	def __init__(self, init=[]):
		Packet.__init__(self, init)
		self.encoded = init != []
		self.records = []

		self.magic = etherbone_magic
		self.version = etherbone_version
		self.addr_size = 32//8
		self.port_size = 32//8
		self.nr = 0
		self.pr = 0
		self.pf = 0

	def get_records(self):
		records = []
		done = False
		payload = self
		while len(payload) != 0:
			record = EtherboneRecord(payload)
			record.decode()
			records.append(copy.deepcopy(record))
			payload = record
		return records

	def decode(self):
		if not self.encoded:
			raise ValueError
		header = []
		for byte in self[:etherbone_packet_header_len]:
			header.append(self.pop(0))
		for k, v in sorted(etherbone_packet_header.items()):
			setattr(self, k, get_field_data(v, header))
		self.records = self.get_records()
		self.encoded = False

	def set_records(self, records):
		for record in records:
			record.encode()
			for byte in record:
				self.append(byte)

	def encode(self):
		if self.encoded:
			raise ValueError
		self.set_records(self.records)
		header = 0
		for k, v in sorted(etherbone_packet_header.items()):
			value = merge_bytes(split_bytes(getattr(self, k), math.ceil(v.width/8)), "little")
			header += (value << v.offset+(v.byte*8))
		for d in split_bytes(header, etherbone_packet_header_len):
			self.insert(0, d)
		self.encoded = True

	def __repr__(self):
		r = "Packet\n"
		r += "--------\n"
		if self.encoded:
			for d in self:
				r += "{:02x}".format(d)
		else:
			for k in sorted(etherbone_packet_header.keys()):
				r += k + " : 0x{:0x}\n".format(getattr(self,k))
			for i, record in enumerate(self.records):
				r += record.__repr__(i)
		return r

class Etherbone(Module):
	def  __init__(self, udp, debug=False):
		self.udp = udp
		self.debug = debug
		self.tx_packets = []
		self.tx_packet = EtherbonePacket()
		self.rx_packet = EtherbonePacket()

		udp.set_etherbone_callback(self.callback)

	def send(self, packet):
		packet.encode()
		if self.debug:
			print_etherbone(">>>>>>>>")
			print_etherbone(packet)
		udp_packet = udp.UDPPacket(packet)
		udp_packet.src_port = 0x1234  # XXX
		udp_packet.dst_port = 20000 # XXX
		udp_packet.length = len(packet)
		udp_packet.checksum = 0
		self.udp.send(udp_packet)

	def callback(self, packet):
		packet = EtherbonePacket(packet)
		packet.decode()
		if self.debug:
			print_etherbone("<<<<<<<<")
			print_etherbone(packet)
		self.process(packet)

	def process(self, packet):
		pass

if __name__ == "__main__":
	# Writes/Reads
	writes = EtherboneWrites(base_addr=0x1000)
	for i in range(16):
		writes.add(EtherboneWrite(i))
	reads = EtherboneReads(base_ret_addr=0x2000)
	for i in range(16):
		reads.add(EtherboneRead(i))

	# Record
	record = EtherboneRecord()
	record.writes = writes
	record.reads = reads
	record.bca = 0
	record.rca = 0
	record.rff = 0
	record.cyc = 0
	record.wca = 0
	record.wff = 0
	record.byte_enable = 0
	record.wcount = 16
	record.rcount = 16

	# Packet
	packet = EtherbonePacket()
	packet.records = [copy.deepcopy(record) for i in range(8)]
	packet.nr = 0
	packet.pr = 0
	packet.pf = 0
	#print(packet)
	packet.encode()
	#print(packet)

	# Send packet over UDP to check against Wireshark dissector
	import socket
	sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
	sock.sendto(bytes(packet), ("192.168.1.1", 20000))

	packet = EtherbonePacket(packet)
	packet.decode()
	print(packet)