#!/usr/bin/python3

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


# units.pyw
#
# This is a GUI which lets you run python expression to calculate numbers,
# which are then used to convert from/to many common measurement units.
#
# Updates happen automatically, each time the main input changes.


import math
from math import \
    acos, acosh, asin, asinh, atan, atan2, atanh, ceil, comb, \
    copysign, cos, cosh, degrees, dist, e, erf, erfc, exp, expm1, \
    fabs, factorial, floor, fmod, frexp, fsum, gamma, gcd, hypot, inf, \
    isclose, isfinite, isinf, isnan, isqrt, lcm, ldexp, lgamma, log, \
    log10, log1p, log2, modf, nan, nextafter, perm, pi, pow, prod, \
    radians, remainder, sin, sinh, sqrt, tan, tanh, tau, trunc, ulp
try:
    from math import cbrt, exp2
except Exception:
    pass

from random import \
    betavariate, choice, choices, expovariate, gammavariate, gauss, \
    getrandbits, getstate, lognormvariate, normalvariate, paretovariate, \
    randbytes, randint, random, randrange, sample, seed, setstate, \
    shuffle, triangular, uniform, vonmisesvariate, weibullvariate

from statistics import \
    bisect_left, bisect_right, fmean, \
    geometric_mean, harmonic_mean, mean, median, \
    median_grouped, median_high, median_low, mode, multimode, pstdev, \
    pvariance, quantiles, stdev, variance
try:
    from statistics import \
        correlation, covariance, linear_regression, mul, reduce
except Exception:
    pass

from tkinter import Tk, Entry, Label, TOP, BOTTOM, LEFT, Event
from typing import List, Tuple, Union, Any


# some occasionally-useful values
kb = 1024
mb = 1024 * kb
gb = 1024 * mb
tb = 1024 * gb
pb = 1024 * tb
mole = 602214076000000000000000
mol = mole


def check_shortcuts(event: Any) -> None:
    char: str = event.char
    if char == '':
        return
    # copy formula and result to clipboard when enter is pressed
    if ord(char) == 13:
        copy(output['text'])
    # quit when esc key is pressed
    if ord(char) == 27:
        win.quit()


def update_result(event: Event) -> None:
    try:
        expr = input.get()
        if expr == '':
            return
        # square brackets are easier to type and are valid math
        expr = expr.replace('[', '(').replace(']', ')')
        output['text'] = convert(eval(expr))
    except Exception as e:
        output['text'] = e


def copy(s: str) -> None:
    # tkinter's clipboard functionality isn't working
    from subprocess import run
    for p in ['xclip -i', 'wclip -i', 'clip.exe', 'pbcopy']:
        try:
            run(p, input=s, text=True)
            # copy successful, so return
            return
        except Exception:
            pass


def convert(x: float) -> str:
    t = []
    for e in table:
        if e is None:
            t.append('')
        else:
            y = e[1] * x + e[2]
            t.append('{:,} {:<3} = {:,.4f} {}'.format(x, e[0], y, e[3]))
    return '\n'.join(t)


# unit conversion table
table: List[Union[Tuple[str, float, float, str], None]] = [
    # from, multiplier, offset, to
    # none values mark where to put empty lines in the output
    ('ft', 0.3048, 0, 'm'),
    ('m', 3.28084, 0, 'ft'),
    ('in', 2.54, 0, 'cm'),
    ('cm', 0.393701, 0, 'in'),
    ('mi', 1.60934, 0, 'km'),
    ('km', 0.621371, 0, 'mi'),
    ('yd', 0.9144, 0, 'm'),
    ('m', 1.09361, 0, 'yd'),
    None,
    ('f', 5/9, -32*5/9, 'c'),
    ('c', 9/5, 32, 'f'),
    None,
    ('lb', 0.453592, 0, 'kg'),
    ('kg', 2.20462, 0, 'lb'),
    ('oz', 28.3495, 0, 'g'),
    ('g', 0.035274, 0, 'oz'),
    None,
    ('gal', 3.78541, 0, 'l'),
    ('l', 0.264172, 0, 'gal'),
    None,
    ('in2', 6.4516, 0, 'cm2'),
    ('cm2', 0.15500031, 0, 'in2'),
    ('ft2', 0.092903, 0, 'm2'),
    ('m2', 10.7639, 0, 'ft2'),
    ('mi2', 2.58999, 0, 'km2'),
    ('km2', 0.386102, 0, 'mi2'),
    ('ac', 0.00404686, 0, 'km2'),
    ('km2', 247.105, 0, 'ac'),
]

win = Tk()
win.title('Unit-conversion Calculator')
input = Entry(font=20, width=35)
input.pack(side=TOP, padx=5)
input.bind('<KeyPress>', check_shortcuts)
input.bind('<KeyRelease>', update_result)
input.focus()

font = ('Lucida Console', 12)
output = Label(text='esc\tquits\nenter\tcopies to clipboard', font=font)
output.config(justify=LEFT)
output.pack(side=BOTTOM, padx=10, pady=5)
win.mainloop()