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from io import StringIO

import pytest

from .writer import Writer, SkipEvent
from .layout import *
from .keyboard import defaultKeyboards

def toButtonComb (keyboard, data):
    lookupButton = lambda x: keyboard.find (x)
    return ButtonCombination (*map (lambda y: frozenset (lookupButton (z) for z in y), data))
    
def test_writer ():
    keyboard = defaultKeyboards['ibmpc105']
    layout = defaultLayouts['ar-linux'].specialize (keyboard)
    w = Writer (layout)

    f = w[LEFT][RING]
    assert f.number == RING
    assert f.hand.position == LEFT

typeData = [
    ('شسضص', [
        ('ش', (tuple (), ('Dl1', ))),
        ('س', (tuple (), ('Dl2', ))),
        ('ض', (tuple (), ('Cl1', ))),
        ('ص', (tuple (), ('Cl2', ))),
        ]),
    ('aصb', [
        (None, SkipEvent ('a')),
        ('ص', (tuple (), ('Cl2', ))),
        (None, SkipEvent ('b')),
        ]),
    ]

@pytest.mark.parametrize("s, expect", typeData)
def test_writer_type (s, expect):
    keyboard = defaultKeyboards['ibmpc105']
    layout = defaultLayouts['ar-linux'].specialize (keyboard)
    w = Writer (layout)

    data = StringIO (s)
    result = list (w.type (data))

    newExpect = []
    for char, comb in expect:
        if isinstance (comb, SkipEvent):
            newExpect.append ((char, comb))
        else:
            newExpect.append ((char, toButtonComb (keyboard, comb)))
    expect = newExpect
    assert result == expect

testCombs = [
    ([
        (('El_shift', ), ('Dr7', )),
        (('Er_shift', ), ('Dr7', )),
    ], 0, None
    ), ([
        (('El_shift', ), ('Dl5', )),
        (('Er_shift', ), ('Dl5', )),
    ], 1, None
    ), ([
        (tuple (), ('Fl_space', )),
        (tuple (), ('Fr_space', )),
    ], 0, (tuple (), ('Dr7', ))
    ), ([
        (tuple (), ('Fl_space', )),
        (tuple (), ('Fr_space', )),
    ], 1, (tuple (), ('Dl5', ))
    ), ([
        (tuple (), ('Fl_space', )),
        (tuple (), ('Fr_space', )),
    ], 1, (('El_shift', ), ('Dr7', ))
    ), ([
        (tuple (), ('Fl_space', )),
        (tuple (), ('Fr_space', )),
    ], 0, (('Er_shift', ), ('Dl5', ))
    ), ([
        # choose the shortest combination if there’s two available
        (tuple (), ('CD_ret', )),
        (('Er_shift', ), ('CD_ret', )),
        (('El_shift', ), ('CD_ret', )),
    ], 0, None),
    ([
        (('El_shift', ), ('Cl4', )),
        (('Er_shift', ), ('Cl4', )),
    ], 1, (tuple (), ('Fr_space', ))),
    ]

@pytest.mark.parametrize("combs, expect, prev", testCombs)
def test_writer_chooseComb (combs, expect, prev):
    keyboard = defaultKeyboards['ibmpc105']
    layout = defaultLayouts['ar-linux'].specialize (keyboard)
    w = Writer (layout)

    if prev:
        prev = toButtonComb (keyboard, prev)
        w.press (prev)
    combs = [toButtonComb (keyboard, x) for x in combs]
    result = w.chooseCombination (combs)
    assert result == combs[expect]

    if len (result) == 2:
        assert w.getHandFinger (first (result.modifier))[0] != w.getHandFinger (first (result.buttons))[0]