# This file is Copyright (c) 2013 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD

import os, subprocess

from migen.fhdl.structure import _Fragment
from mibuild.generic_platform import *
from mibuild import tools

def _format_constraint(c):
	if isinstance(c, Pins):
		return "set_location_assignment PIN_" + c.identifiers[0]
	elif isinstance(c, IOStandard):
		return "set_instance_assignment -name IO_STANDARD " + "\"" + c.name + "\"" 
	elif isinstance(c, Misc):
		return c.misc

def _format_qsf(signame, pin, others, resname):
	fmt_c = [_format_constraint(c) for c in ([Pins(pin)] + others)]
	fmt_r = resname[0] + ":" + str(resname[1])
	if resname[2] is not None:
		fmt_r += "." + resname[2]
	r = ""
	for c in fmt_c:
		r += c + " -to " + signame + " # " + fmt_r + "\n"
	return r

def _build_qsf(named_sc, named_pc):
	r = ""
	for sig, pins, others, resname in named_sc:
		if len(pins) > 1:
			for i, p in enumerate(pins):
				r += _format_qsf(sig + "[" + str(i) + "]", p, others, resname)
		else:
			r += _format_qsf(sig, pins[0], others, resname)
	if named_pc:
		r += "\n" + "\n\n".join(named_pc)
	r += "set_global_assignment -name top_level_entity top\n"
	return r

def _build_files(device, sources, vincpaths, named_sc, named_pc, build_name):
	qsf_contents = ""
	for filename, language in sources:
		# Enforce use of SystemVerilog (Quartus does not support global parameters in Verilog)
		if language == "verilog":
			language = "systemverilog"
		qsf_contents += "set_global_assignment -name "+language.upper()+"_FILE " + filename.replace("\\","/") + "\n"

	for path in vincpaths:
		qsf_contents += "set_global_assignment -name SEARCH_PATH " + path.replace("\\","/") + "\n"

	qsf_contents += _build_qsf(named_sc, named_pc)
	qsf_contents += "set_global_assignment -name DEVICE " + device
	tools.write_to_file(build_name + ".qsf", qsf_contents)

def _run_quartus(build_name, quartus_path):
	build_script_contents = """# Autogenerated by mibuild

quartus_map --read_settings_files=on --write_settings_files=off {build_name} -c {build_name}
quartus_fit --read_settings_files=off --write_settings_files=off {build_name} -c {build_name}
quartus_asm --read_settings_files=off --write_settings_files=off {build_name} -c {build_name}
quartus_sta {build_name} -c {build_name}

""".format(build_name=build_name)
	build_script_file = "build_" + build_name + ".sh"
	tools.write_to_file(build_script_file, build_script_contents, force_unix=True)

	r = subprocess.call(["bash", build_script_file])
	if r != 0:
		raise OSError("Subprocess failed")

class AlteraQuartusPlatform(GenericPlatform):
	bitstream_ext = ".sof"
	def build(self, fragment, build_dir="build", build_name="top",
			quartus_path="/opt/Altera", run=True):
		tools.mkdir_noerror(build_dir)
		os.chdir(build_dir)

		if not isinstance(fragment, _Fragment):
			fragment = fragment.get_fragment()
		self.finalize(fragment)
		
		v_src, named_sc, named_pc = self.get_verilog(fragment)
		v_file = build_name + ".v"
		tools.write_to_file(v_file, v_src)
		sources = self.sources + [(v_file, "verilog")]
		_build_files(self.device, sources, self.verilog_include_paths, named_sc, named_pc, build_name)
		if run:
			_run_quartus(build_name, quartus_path)
		
		os.chdir("..")

	def add_period_constraint(self, clk, period):
		self.add_platform_command("""set_global_assignment -name DUTY_CYCLE 50 -section_id {clk}""", clk=clk)
		self.add_platform_command("""set_global_assignment -name FMAX_REQUIREMENT "{freq} MHz" -section_id {clk}\n""".format(freq=str(float(1/period)*1000), clk="{clk}"), clk=clk)