#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from typing import List

awg_equiv_table = {
    '0.09': '28',
    '0.14': '26',
    '0.25': '24',
    '0.34': '22',
    '0.5': '21',
    '0.75': '20',
    '1': '18',
    '1.5': '16',
    '2.5': '14',
    '4': '12',
    '6': '10',
    '10': '8',
    '16': '6',
    '25': '4',
    '35': '2',
    '50': '1',
}

mm2_equiv_table = {v:k for k,v in awg_equiv_table.items()}

def awg_equiv(mm2):
    return awg_equiv_table.get(str(mm2), 'Unknown')

def mm2_equiv(awg):
    return mm2_equiv_table.get(str(awg), 'Unknown')

def nested_html_table(rows):
    # input: list, each item may be scalar or list
    # output: a parent table with one child table per parent item that is list, and one cell per parent item that is scalar
    # purpose: create the appearance of one table, where cell widths are independent between rows
    html = '<table border="0" cellspacing="0" cellpadding="0">'
    for row in rows:
        if isinstance(row, List):
            if len(row) > 0 and any(row):
                html = f'{html}<tr><td><table border="0" cellspacing="0" cellpadding="3" cellborder="1"><tr>'
                for cell in row:
                    if cell is not None:
                        html = f'{html}<td balign="left">{cell}</td>'
                html = f'{html}</tr></table></td></tr>'
        elif row is not None:
            html = f'{html}<tr><td>{row}</td></tr>'
    html = f'{html}</table>'
    return html


def expand(yaml_data):
    # yaml_data can be:
    # - a singleton (normally str or int)
    # - a list of str or int
    # if str is of the format '#-#', it is treated as a range (inclusive) and expanded
    output = []
    if not isinstance(yaml_data, list):
        yaml_data = [yaml_data]
    for e in yaml_data:
        e = str(e)
        if '-' in e:  # list of pins
            a, b = tuple(map(int, e.split('-')))
            if a < b:
                for x in range(a, b + 1):
                    output.append(x)
            elif a > b:
                for x in range(a, b - 1, -1):
                    output.append(x)
            elif a == b:
                output.append(a)
        else:
            try:
                x = int(e)
            except Exception:
                x = e
            output.append(x)
    return output


def int2tuple(inp):
    if isinstance(inp, tuple):
        output = inp
    else:
        output = (inp,)
    return output


def flatten2d(inp):
    return [[str(item) if not isinstance(item, List) else ', '.join(item) for item in row] for row in inp]


def tuplelist2tsv(inp, header=None):
    output = ''
    if header is not None:
        inp.insert(0, header)
    inp = flatten2d(inp)
    for row in inp:
        output = output + '\t'.join(str(item) for item in row) + '\n'
    return output

# Return the value indexed if it is a list, or simply the value otherwise.
def index_if_list(value, index):
    return value[index] if isinstance(value, list) else value

def html_line_breaks(inp):
    return inp.replace('\n', '<br />') if isinstance(inp, str) else inp

def graphviz_line_breaks(inp):
    return inp.replace('\n', '\\n') if isinstance(inp, str) else inp # \n generates centered new lines. http://www.graphviz.org/doc/info/attrs.html#k:escString

def remove_line_breaks(inp):
    return inp.replace('\n', ' ').rstrip() if isinstance(inp, str) else inp

def open_file_read(filename):
    # TODO: Intelligently determine encoding
    return open(filename, 'r', encoding='UTF-8')

def open_file_write(filename):
    return open(filename, 'w', encoding='UTF-8')