#!/usr/bin/env python
"""Generates the pins file for the CC3200."""

from __future__ import print_function

import argparse
import sys
import csv


SUPPORTED_AFS = { 'UART': ('TX', 'RX', 'RTS', 'CTS'),
                  'SPI': ('CLK', 'MOSI', 'MISO', 'CS0'),
                  #'I2S': ('CLK', 'FS', 'DAT0', 'DAT1'),
                  'I2C': ('SDA', 'SCL'),
                  'TIM': ('PWM'),
                  'SD': ('CLK', 'CMD', 'DAT0'),
                  'ADC': ('CH0', 'CH1', 'CH2', 'CH3')
                }

def parse_port_pin(name_str):
    """Parses a string and returns a (port, gpio_bit) tuple."""
    if len(name_str) < 3:
        raise ValueError("Expecting pin name to be at least 3 characters")
    if name_str[:2] != 'GP':
        raise ValueError("Expecting pin name to start with GP")
    if not name_str[2:].isdigit():
        raise ValueError("Expecting numeric GPIO number")
    port = int(int(name_str[2:]) / 8)
    gpio_bit = 1 << int(int(name_str[2:]) % 8)
    return (port, gpio_bit)


class AF:
    """Holds the description of an alternate function"""
    def __init__(self, name, idx, fn, unit, type):
        self.name = name
        self.idx = idx
        if self.idx > 15:
            self.idx = -1
        self.fn = fn
        self.unit = unit
        self.type = type

    def print(self):
        print ('    AF({:16s}, {:4d}, {:8s}, {:4d}, {:8s}),    // {}'.format(self.name, self.idx, self.fn, self.unit, self.type, self.name))


class Pin:
    """Holds the information associated with a pin."""
    def __init__(self, name, port, gpio_bit, pin_num):
        self.name = name
        self.port = port
        self.gpio_bit = gpio_bit
        self.pin_num = pin_num
        self.board_pin = False
        self.afs = []

    def add_af(self, af):
        self.afs.append(af)

    def print(self):
        print('// {}'.format(self.name))
        if len(self.afs):
            print('const pin_af_t pin_{}_af[] = {{'.format(self.name))
            for af in self.afs:
                af.print()
            print('};')
            print('pin_obj_t pin_{:4s} = PIN({:6s}, {:1d}, {:3d}, {:2d}, pin_{}_af, {});\n'.format(
                   self.name, self.name, self.port, self.gpio_bit, self.pin_num, self.name, len(self.afs)))
        else:
            print('pin_obj_t pin_{:4s} = PIN({:6s}, {:1d}, {:3d}, {:2d}, NULL, 0);\n'.format(
                   self.name, self.name, self.port, self.gpio_bit, self.pin_num))

    def print_header(self, hdr_file):
        hdr_file.write('extern pin_obj_t pin_{:s};\n'.format(self.name))


class Pins:
    def __init__(self):
        self.board_pins = []   # list of pin objects

    def find_pin(self, port, gpio_bit):
        for pin in self.board_pins:
            if pin.port == port and pin.gpio_bit == gpio_bit:
                return pin

    def find_pin_by_num(self, pin_num):
        for pin in self.board_pins:
            if pin.pin_num == pin_num:
                return pin

    def find_pin_by_name(self, name):
        for pin in self.board_pins:
            if pin.name == name:
                return pin

    def parse_af_file(self, filename, pin_col, pinname_col, af_start_col):
        with open(filename, 'r') as csvfile:
            rows = csv.reader(csvfile)
            for row in rows:
                try:
                    (port_num, gpio_bit) = parse_port_pin(row[pinname_col])
                except:
                    continue
                if not row[pin_col].isdigit():
                    raise ValueError("Invalid pin number {:s} in row {:s}".format(row[pin_col]), row)
                # Pin numbers must start from 0 when used with the TI API
                pin_num = int(row[pin_col]) - 1;        
                pin = Pin(row[pinname_col], port_num, gpio_bit, pin_num)
                self.board_pins.append(pin)
                af_idx = 0
                for af in row[af_start_col:]:
                    af_splitted = af.split('_')
                    fn_name = af_splitted[0].rstrip('0123456789')
                    if  fn_name in SUPPORTED_AFS:
                        type_name = af_splitted[1]
                        if type_name in SUPPORTED_AFS[fn_name]:
                            unit_idx = af_splitted[0][-1]
                            pin.add_af(AF(af, af_idx, fn_name, int(unit_idx), type_name))
                    af_idx += 1

    def parse_board_file(self, filename, cpu_pin_col):
        with open(filename, 'r') as csvfile:
            rows = csv.reader(csvfile)
            for row in rows:
                # Pin numbers must start from 0 when used with the TI API
                if row[cpu_pin_col].isdigit():
                    pin = self.find_pin_by_num(int(row[cpu_pin_col]) - 1)
                else:
                    pin = self.find_pin_by_name(row[cpu_pin_col])
                if pin:
                    pin.board_pin = True

    def print_named(self, label, pins):
        print('')
        print('STATIC const mp_rom_map_elem_t pin_{:s}_pins_locals_dict_table[] = {{'.format(label))
        for pin in pins:
            if pin.board_pin:
                print('    {{ MP_ROM_QSTR(MP_QSTR_{:6s}), MP_ROM_PTR(&pin_{:6s}) }},'.format(pin.name, pin.name))
        print('};')
        print('MP_DEFINE_CONST_DICT(pin_{:s}_pins_locals_dict, pin_{:s}_pins_locals_dict_table);'.format(label, label));

    def print(self):
        for pin in self.board_pins:
            if pin.board_pin:
                pin.print()
        self.print_named('board', self.board_pins)
        print('')

    def print_header(self, hdr_filename):
        with open(hdr_filename, 'wt') as hdr_file:
            for pin in self.board_pins:
                if pin.board_pin:
                    pin.print_header(hdr_file)

    def print_qstr(self, qstr_filename):
        with open(qstr_filename, 'wt') as qstr_file:
            pin_qstr_set = set([])
            af_qstr_set = set([])
            for pin in self.board_pins:
                if pin.board_pin:
                    pin_qstr_set |= set([pin.name])
                    for af in pin.afs:
                        af_qstr_set |= set([af.name])
            print('// Board pins', file=qstr_file)
            for qstr in sorted(pin_qstr_set):
                print('Q({})'.format(qstr), file=qstr_file)
            print('\n// Pin AFs', file=qstr_file)
            for qstr in sorted(af_qstr_set):
                print('Q({})'.format(qstr), file=qstr_file)


def main():
    parser = argparse.ArgumentParser(
        prog="make-pins.py",
        usage="%(prog)s [options] [command]",
        description="Generate board specific pin file"
    )
    parser.add_argument(
        "-a", "--af",
        dest="af_filename",
        help="Specifies the alternate function file for the chip",
        default="cc3200_af.csv"
    )
    parser.add_argument(
        "-b", "--board",
        dest="board_filename",
        help="Specifies the board file",
    )
    parser.add_argument(
        "-p", "--prefix",
        dest="prefix_filename",
        help="Specifies beginning portion of generated pins file",
        default="cc3200_prefix.c"
    )
    parser.add_argument(
        "-q", "--qstr",
        dest="qstr_filename",
        help="Specifies name of generated qstr header file",
        default="build/pins_qstr.h"
    )
    parser.add_argument(
        "-r", "--hdr",
        dest="hdr_filename",
        help="Specifies name of generated pin header file",
        default="build/pins.h"
    )
    args = parser.parse_args(sys.argv[1:])

    pins = Pins()

    print('// This file was automatically generated by make-pins.py')
    print('//')
    if args.af_filename:
        print('// --af {:s}'.format(args.af_filename))
        pins.parse_af_file(args.af_filename, 0, 1, 3)

    if args.board_filename:
        print('// --board {:s}'.format(args.board_filename))
        pins.parse_board_file(args.board_filename, 1)

    if args.prefix_filename:
        print('// --prefix {:s}'.format(args.prefix_filename))
        print('')
        with open(args.prefix_filename, 'r') as prefix_file:
            print(prefix_file.read())
    pins.print()
    pins.print_qstr(args.qstr_filename)
    pins.print_header(args.hdr_filename)


if __name__ == "__main__":
    main()
