import unittest
import inspect

from cturmit import CTurmit as Turmit
from gte.rpnlib import _op_list

class TurmitTestCase(unittest.TestCase):
    
    def test_init(self):
        ''' Test Turmit class __init__ '''
        t = Turmit(42)
        self.assertEqual(len(t._stack), 42)
        self.assertEqual(t.shead, 0)
        self.assertEqual(len(t._stack) - 1 , t._cur)

    def test_init_args(self):
        ''' Test Turmit __init__ arguments '''
        t = Turmit()
        t = Turmit(prog = 'G R B 44 MOD ADD 43 MOD ADD 42 MOD')
        t = Turmit(prog = 'G R B ADD ADD 42 MOD', max_int = 0xFFFF,
                   stack_size=42)

    def test_call(self):
        ''' Test Turmit.__call__ '''
        t = Turmit(prog = 'G R B ADD ADD 42 MOD', max_int = 0xFFFF,
                   stack_size=42)
        r = t(x=1, y=2, r=255, g=255, b=255)
        self.assertEqual(r, 9)
        r = t(x=2, y=2, r=255, g=0, b=0)
        self.assertEqual(r, 3)

    def test_copy(self):
        t = Turmit(prog = 'G R B ADD ADD 42 MOD', max_int = 0xFFFF,
                   stack_size=42)
        t2 = Turmit(turmit=t)
        r = t2(x=1, y=2, r=255, g=255, b=255)
        self.assertEqual(r, 9)
        r = t2(x=2, y=2, r=255, g=0, b=0)
        self.assertEqual(r, 3)
        

    def test_init_badargs(self):
        ''' Test Turmit __init__ bad arguments '''
        with self.assertRaises(RuntimeError):
            t = Turmit(foobar=42)
        with self.assertRaises(ValueError):
            t = Turmit(prog='foobar')


class TurmitExprCompileTestCase(unittest.TestCase):
    ''' Tests compilatin capabilities of cturmit '''

    def test_values(self):
        progs = ('1', '0x1', '9', '0x9', '0xf', '0xF', '0x1FFF', '0xFFF1',
        '12345');
        for prog in progs:
            t = Turmit(prog=prog)

    def test_var(self):
        progs = ('x', 'y', 'r', 'g', 'b')
        for prog in progs:
            t = Turmit(prog=prog)


class TurmitOperationTestCase(unittest.TestCase):
    
    def test_push(self):
        ''' Test Turmit _push() method '''
        t = Turmit()
        t._push(1)
        self.assertEqual(t.shead, 1)
        t._push(2)
        self.assertEqual(t.shead, 2)

    def _rpn(self, rpn, narg = 2):
        if rpn not in _op_list:
            raise unittest.SkipTest('"%s" not implemented' % rpn)
        method, wrapped = _op_list[rpn]
        if narg != len(inspect.signature(method).parameters) - 1:
            self.fail('Expected %s to take %d arguments, but Turmit.%s() takes \
%d arguments' % (rpn, narg, rpn, len(inspect.signature(method).parameters) - 1))

    def test_add(self):
        ''' Test turmit add method '''
        self._rpn('add')

        t = Turmit()
        t._push(42)
        t._push(8)
        t.add()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 50)

        t._push(42)
        t._push(8)
        t.add()
        self.assertEqual(t._cur, 1)
        self.assertEqual(t.shead, 50)

        t.add()

        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 100)

    def test_mem_sz(self):
        ''' Test turmit mem_sz() operation '''
        self._rpn('mem_sz', 1)

        t = Turmit(8)
        self.assertEqual(len(t._stack), 8)

        t._push(42)
        t.mem_sz()
        self.assertEqual(len(t._stack), 42)
        self.assertEqual(t._cur, 7)

        t._push(42)
        t._push(8)
        t.mem_sz()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 42)

    def test_sub(self):
        ''' Test turmit sub() method '''
        self._rpn('sub')

        t = Turmit(max_int=0xFFFF)

        t._push(50)
        t._push(8)

        t.sub()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 42)

        t._push(50)
        t._push(8)
        t.sub()
        self.assertEqual(t._cur, 1)
        self.assertEqual(t.shead, 42)

        t.sub()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 0)

        t._push(8)
        t._push(50)
        t.sub()
        self.assertEqual(t._cur, 1)
        self.assertEqual(t.shead, 0xFFFF + (8 - 50))

    def test_mul(self):
        ''' Test turmit mul() method '''
        self._rpn('mul')

        t = Turmit()

        t._push(7)
        t._push(6)

        t.mul()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 42)

        t._push(7)
        t._push(6)
        t.mul()
        self.assertEqual(t._cur, 1)
        self.assertEqual(t.shead, 42)

        t.mul()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 42 *42)
    
    def test_div(self):
        ''' Test turmit division capabilities '''
        self._rpn('div')

        t = Turmit()

        t._push(43)
        t._push(7)

        t.div()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 6)

    def test_mod(self):
        ''' Test turmit mod() method '''
        self._rpn('mod')

        t = Turmit()
        t._push(42)
        t._push(4)

        t.mod()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 2)

    def test_pow(self):
        ''' Test turmit pow() method '''
        self._rpn('pow')

        t = Turmit()
        t._push(2)
        t._push(4)

        t.pow()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 16)

    def test_sqrt(self):
        ''' Test turmit sqrt() method '''
        self._rpn('sqrt', 1)

        t = Turmit()
        t._push(42)

        t.sqrt()

        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 6)

    def test_and(self):
        ''' Test turmit binary and() method '''
        self._rpn('bin_and')

        t = Turmit()
        t._push(10)
        t._push(42)

        t.bin_and()

        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 10)

    def test_or(self):
        ''' Test turmit binary or() method '''
        self._rpn('bin_or')

        t = Turmit()
        t._push(42)
        t._push(7)

        t.bin_or()
        
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 47)

    def test_xor(self):
        ''' Test turmit binary xor() method '''
        self._rpn('bin_xor')

        t = Turmit()
        t._push(42)
        t._push(11)

        t.bin_xor()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 33)

    def test_rshift(self):
        ''' Test turmit rshift method '''
        self._rpn('rshift')

        t = Turmit()
        t._push(42)
        t._push(2)

        t.rshift()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 10)

    def test_lshift(self):
        ''' Test turmit lshift method '''
        self._rpn('lshift')

        t = Turmit()
        t._push(10)
        t._push(2)
        t.lshift()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 40)

    def test_dup(self):
        ''' Test turmit dup() method '''
        self._rpn('dup', 1)

        t = Turmit()
        t._push(42)
        t.dup()
        self.assertEqual(t._cur, 1)
        self.assertEqual(t.shead, 42)

    def test_pop(self):
        ''' Test turmit pop() method '''
        self._rpn('pop', 1)

        t = Turmit()
        t._push(10)
        t._push(2)
        t.pop()
        self.assertEqual(t._cur, 0)
        self.assertEqual(t.shead, 10)
        t.pop()
        self.assertEqual(t._cur, len(t._stack) - 1)

    def test_swp(self):
        ''' Test turmit swp() method '''
        self._rpn('swp', 2)

        t = Turmit()
        t._push(42)
        t._push(1337)
        t.swp()
        self.assertEqual(t._cur, 1)
        self.assertEqual(t.shead, 42)
        t._pop()
        self.assertEqual(t.shead, 1337)