#!/usr/bin/env python3
"""
Unit version.
"""
import re

from module import commands, example

find_temp = re.compile('(-?[0-9]*\.?[0-9]*)[ °]*(K|C|F)', re.IGNORECASE)

length = r"([0-9]*\.?[0-9]*)[ ]*(mile[s]?|mi|inch|in|foot|feet|ft|yard[s]?|yd|"\
	+ r"(?:milli|centi|kilo|)meter[s]?|[mkc]?m|ly|light-year[s]?|au|astronomic"\
	+ r"al unit[s]?|parsec[s]?|pc)"
find_length = re.compile(length, re.IGNORECASE)

mass = r"([0-9]*\.?[0-9]*)[ ]*(lb|lbm|pound[s]?|ounce|oz|(?:kilo|)gram(?:me|)["\
	+ r"s]?|[k]?g)"
find_mass = re.compile(mass, re.IGNORECASE)


def f_to_c(temp):
	return (float(temp) - 32) * 5 / 9


def c_to_k(temp):
	return temp + 273.15


def c_to_f(temp):
	return (9.0 / 5.0 * temp + 32)


def k_to_c(temp):
	return temp - 273.15


@commands('temp', 'temperature')
@example('.temp 100F', '37.78°C = 100.00°F = 310.93K')
@example('.temp 100C', '100.00°C = 212.00°F = 373.15K')
@example('.temp 100K', '-173.15°C = -279.67°F = 100.00K')
def temperature(bot, trigger):
	"""
	Convert temperatures
	"""
	try:
		source = find_temp.match(' '.join(trigger.args[1:])).groups()
	except (AttributeError, TypeError):
		return bot.reply("That's not a valid temperature.")
	unit = source[1].upper()
	numeric = float(source[0])
	celsius = 0
	if unit == 'C':
		celsius = numeric
	elif unit == 'F':
		celsius = f_to_c(numeric)
	elif unit == 'K':
		celsius = k_to_c(numeric)

	kelvin = c_to_k(celsius)
	fahrenheit = c_to_f(celsius)
	bot.reply("{:.2f}°C = {:.2f}°F = {:.2f}K".format(celsius,fahrenheit,kelvin))


@commands('dist', 'distance', 'length')
@example('.distance 3m', '3.00m = 9 feet, 10.11 inches')
@example('.distance 3km', '3.00km = 1.86 miles')
@example('.distance 3 miles', '4.83km = 3.00 miles')
@example('.distance 3 inch', '7.62cm = 3.00 inches')
@example('.distance 3 feet', '91.44cm = 3 feet, 0.00 inches')
@example('.distance 3 yards', '2.74m = 9 feet, 0.00 inches')
@example('.distance 155cm', '1.55m = 5 feet, 1.02 inches')
@example('.length 3 ly', '28382191417742.40km = 17635876112814.77 miles')
@example('.length 3 au', '448793612.10km = 278867421.71 miles')
@example('.length 3 parsec', '92570329129020.20km = 57520535754731.61 miles')
def distance(bot, trigger):
	"""
	Convert distances
	"""
	try:
		source = find_length.match(' '.join(trigger.args[1:])).groups()
	except (AttributeError, TypeError):
		return bot.reply("That's not a valid length unit.")
	unit = source[1].lower()
	numeric = float(source[0])
	meter = 0
	if unit in ("meters", "meter", "m"):
		meter = numeric
	elif unit in ("millimeters", "millimeter", "mm"):
		meter = numeric / 1000
	elif unit in ("kilometers", "kilometer", "km"):
		meter = numeric * 1000
	elif unit in ("miles", "mile", "mi"):
		meter = numeric / 0.00062137
	elif unit in ("inch", "in"):
		meter = numeric / 39.370
	elif unit in ("centimeters", "centimeter", "cm"):
		meter = numeric / 100
	elif unit in ("feet", "foot", "ft"):
		meter = numeric / 3.2808
	elif unit in ("yards", "yard", "yd"):
		meter = numeric / (3.2808 / 3)
	elif unit in ("light-year", "light-years", "ly"):
		meter = numeric * 9460730472580800
	elif unit in ("astronomical unit", "astronomical units", "au"):
		meter = numeric * 149597870700
	elif unit in ("parsec", "parsecs", "pc"):
		meter = numeric * 30856776376340068

	if meter >= 1000:
		metric_part = '{:.2f}km'.format(meter / 1000)
	elif meter < 0.01:
		metric_part = '{:.2f}mm'.format(meter * 1000)
	elif meter < 1:
		metric_part = '{:.2f}cm'.format(meter * 100)
	else:
		metric_part = '{:.2f}m'.format(meter)

	# Shit like this makes me hate being an American.
	inch = meter * 39.37
	foot = int(inch) // 12
	inch = inch - (foot * 12)
	yard = foot // 3
	mile = meter * 0.000621371192

	if yard > 500:
		stupid_part = '{:.2f} miles'.format(mile)
	else:
		parts = []
		if yard >= 100:
			parts.append('{} yards'.format(yard))
			foot -= (yard * 3)

		if foot == 1:
			parts.append('1 foot')
		elif foot != 0:
			parts.append('{:.0f} feet'.format(foot))

		parts.append('{:.2f} inches'.format(inch))

		stupid_part = ', '.join(parts)

	bot.reply('{} = {}'.format(metric_part, stupid_part))


@commands('weight', 'mass')
@example(".weight 56 g", "56.00g = 1.98 oz")
@example(".mass 78lb", "35.38kg = 78 pounds")
@example("mass 72kg", "72.00kg = 158 pounds 11.73 ounces")
def mass(bot, trigger):
	"""
	Convert mass
	"""
	try:
		source = find_mass.match(' '.join(trigger.args[1:])).groups()
	except (AttributeError, TypeError):
		return bot.reply("That's not a valid mass unit.")
	unit = source[1].lower()
	numeric = float(source[0])
	metric = 0
	if unit in ("gram", "grams", "gramme", "grammes", "g"):
		metric = numeric
	elif unit in ("kilogram", "kilograms", "kilogramme", "kilogrammes", "kg"):
		metric = numeric * 1000
	elif unit in ("lb", "lbm", "pound", "pounds"):
		metric = numeric * 453.59237
	elif unit in ("oz", "ounce"):
		metric = numeric * 28.35

	if metric >= 1000:
		metric_part = '{:.2f}kg'.format(metric / 1000)
	else:
		metric_part = '{:.2f}g'.format(metric)

	ounce = metric * .035274
	pound = int(ounce) // 16
	ounce = ounce - (pound * 16)

	if pound > 1:
		stupid_part = '{} pounds'.format(pound)
		if ounce > 0.01:
			stupid_part += ' {:.2f} ounces'.format(ounce)
	else:
		stupid_part = '{:.2f} oz'.format(ounce)

	bot.reply('{} = {}'.format(metric_part, stupid_part))