import subprocess
import os

class Programmer:
	def __init__(self, platform_name, flash_proxy_dir):
		self.platform_name = platform_name
		self.flash_proxy_dir = flash_proxy_dir

	def find_flash_proxy(self, name):
		if self.flash_proxy_dir is not None:
			search_dirs = [self.flash_proxy_dir]
		else:
			search_dirs = ["~/.mlabs", "/usr/local/share/mlabs", "/usr/share/mlabs"]
		for d in search_dirs:
			fulldir = os.path.abspath(os.path.expanduser(d))
			fullname = os.path.join(fulldir, name)
			if os.path.exists(fullname):
				return fullname
		raise OSError("Failed to find flash proxy bitstream")

def _run_urjtag(cmds):
	with subprocess.Popen("jtag", stdin=subprocess.PIPE) as process:
		process.stdin.write(cmds.encode("ASCII"))
		process.communicate()

class UrJTAG(Programmer):
	needs_bitreverse = True

	def load_bitstream(self, bitstream_file):
		cmds = """cable milkymist
detect
pld load {bitstream}
quit
""".format(bitstream=bitstream_file)
		_run_urjtag(cmds)

	def flash(self, address, data_file):
		flash_proxy = self.find_flash_proxy("fjmem-" + self.platform_name + ".bit")
		cmds = """cable milkymist
detect
pld load "{flash_proxy}"
initbus fjmem opcode=000010
frequency 6000000
detectflash 0
endian big
flashmem "{address}" "{data_file}" noverify
""".format(flash_proxy=flash_proxy, address=address, data_file=data_file)
		_run_urjtag(cmds)

class XC3SProg(Programmer):
	needs_bitreverse = False

	def load_bitstream(self, bitstream_file):
		subprocess.call(["xc3sprog", "-c", "papilio", bitstream_file])

	def flash(self, address, data_file):
		flash_proxy = self.find_flash_proxy("bscan_spi_lx9_papilio.bit")
		subprocess.call(["xc3sprog", "-c", "papilio", "-I"+flash_proxy, "{}:w:0x{:x}:BIN".format(data_file, address)])

def create_programmer(platform_name, *args, **kwargs):
	return {
		"mixxeo":		UrJTAG,
		"m1":			UrJTAG,
		"papilio_pro":	XC3SProg
	}[platform_name](platform_name, *args, **kwargs)