#!/usr/bin/env python
# encoding: utf-8


import unittest

from mapytex.calculus.render import tex, txt
from mapytex.calculus.fraction import Fraction
from mapytex.calculus.polynom import Polynom
from mapytex.calculus.operator import op
from mapytex.calculus.expression import Expression

from itertools import permutations


def mass_poly_test(operation, rg=5):
    """ @todo

    :op: the operation
    :rg: number of potential values for coefs
    :returns: @todo
    """
    coefs_p = [[(i - 2), (j - 2)] for i, j in permutations(range(rg), 2)]
    coefs_q = [[2 * (i - 2), 2 * (j - 2)]
               for i, j in permutations(range(rg), 2)]
    l_p = [Polynom(i) for i in coefs_p]
    l_q = [Polynom(i) for i in coefs_q]
    return [Expression([l_p[i], l_q[j], op.get_op(operation)])
            for i, j in permutations(range(len(coefs_p)), 2)]


class TestTexRender(unittest.TestCase):
    """Testing functions from mapytex.calculus.renders.tex"""

    def test_type_render_int(self):
        self.assertEqual(tex([2]), "2")

    def test_type_render_str(self):
        self.assertEqual(tex(["a"]), "a")

    def test_type_render_float(self):
        self.assertEqual(tex([12.345]), "12.345")

    def test_type_render_fraction(self):
        self.assertEqual(tex([Fraction(1, 2)]), "\\frac{ 1 }{ 2 }")

    def test_type_render_poly(self):
        P = Polynom([1, 2, 3])
        self.assertEqual(tex([P]), "3 x^{  2 } + 2 x + 1")

    def test_add_interger(self):
        exps = [[2, 3, op.add],
                [2, -3, op.add],
                [-2, 3, op.add],
                ]
        wanted_render = ["2 + 3",
                         "2 - 3",
                         "-2 + 3",
                         ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mass_add(self):
        permu = mass_poly_test("+", 5)
        from .mass_test import POLY_ADD_VALID_RESULTS
        for (i, v) in enumerate(permu):
            self.assertEqual(tex(v), POLY_ADD_VALID_RESULTS[i])

    def test_mass_sub(self):
        permu = mass_poly_test("-", 5)
        from .mass_test import POLY_SUB_VALID_RESULTS
        for (i, v) in enumerate(permu):
            self.assertEqual(tex(v), POLY_SUB_VALID_RESULTS[i])

    def test_mass_mul(self):
        permu = mass_poly_test("*", 5)
        from .mass_test import TEX_POLY_MUL_VALID_RESULTS
        for (i, v) in enumerate(permu):
            self.assertEqual(tex(v), TEX_POLY_MUL_VALID_RESULTS[i])

    def test_add_letter(self):
        exps = [[2, "a", op.add],
                ["a", 3, op.add],
                [-2, "a", op.add],
                ["a", -2, op.add],
                ]
        wanted_render = ["2 + a",
                         "a + 3",
                         "-2 + a",
                         "a - 2",
                         ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_add_fraction(self):
        exps = [[2, Fraction(1, 2), op.add],
                [Fraction(1, 2), 3, op.add],
                ]
        wanted_render = ["2 + \\frac{ 1 }{ 2 }",
                         "\\frac{ 1 }{ 2 } + 3",
                         ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_add_poly(self):
        exps = [[2, Polynom([1, 2, 3]), op.mul],
                [Polynom([1, 2, 3]), 2, op.mul],
                [Polynom([1, 2, 3]), Polynom([4, 5, 6]), op.mul],
                ]
        wanted_render = ["2 ( 3 x^{  2 } + 2 x + 1 )",
                         "( 3 x^{  2 } + 2 x + 1 ) \\times 2",
                         "( 3 x^{  2 } + 2 x + 1 ) ( 6 x^{  2 } + 5 x + 4 )",
                         ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mult_interger(self):
        exps = [[2, 3, op.mul],
                [2, -3, op.mul],
                [-2, 3, op.mul],
                ]
        wanted_render = ["2 \\times 3",
                         "2 \\times ( -3 )",
                         "-2 \\times 3",
                         ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mult_letter(self):
        exps = [[2, "a", op.mul],
                ["a", 3, op.mul],
                [-2, "a", op.mul],
                ["a", -2, op.mul],
                ]
        wanted_render = ["2 a", "a \\times 3", "-2 a", "a \\times ( -2 )"]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mult_fraction(self):
        exps = [[2, Fraction(1, 2), op.mul], [Fraction(1, 2), 3, op.mul]]
        wanted_render = [
            "2 \\times \\frac{ 1 }{ 2 }",
            "\\frac{ 1 }{ 2 } \\times 3"]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mult_poly(self):
        exps = [[2, Polynom([1, 2, 3]), op.mul],
                [Polynom([1, 2, 3]), 2, op.mul],
                [Polynom([1, 2, 3]), Polynom([4, 5, 6]), op.mul],
                ]
        wanted_render = ["2 ( 3 x^{  2 } + 2 x + 1 )",
                         "( 3 x^{  2 } + 2 x + 1 ) \\times 2",
                         "( 3 x^{  2 } + 2 x + 1 ) ( 6 x^{  2 } + 5 x + 4 )",
                         ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_parentheses_int(self):
        exps = [
            [2, 3, op.add, 4, op.mul],
            [2, 3, op.mul, 4, op.add],
            [2, 3, 4, op.mul, op.add],
            [2, 3, 4, op.add, op.add],
            [2, 3, 4, op.add, op.sub],
        ]
        wanted_render = [
            '( 2 + 3 ) \\times 4',
            '2 \\times 3 + 4',
            '2 + 3 \\times 4',
            '2 + 3 + 4',
            '2 - ( 3 + 4 )',
        ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_parentheses_poly(self):
        P = Polynom([1, 2, 3])
        Q = Polynom([4, 5, 6])
        exps = [
            [2, P, op.add],
            [2, P, op.sub],
            [2, P, P, op.mul, op.sub],
            [Q, P, op.add],
            [Q, P, op.sub],
        ]
        wanted_render = [
            '2 + 3 x^{  2 } + 2 x + 1',
            '2 - ( 3 x^{  2 } + 2 x + 1 )',
            '2 - ( 3 x^{  2 } + 2 x + 1 ) ( 3 x^{  2 } + 2 x + 1 )',
            '6 x^{  2 } + 5 x + 4 + 3 x^{  2 } + 2 x + 1',
            '6 x^{  2 } + 5 x + 4 - ( 3 x^{  2 } + 2 x + 1 )',
        ]
        for (i, e) in enumerate(exps):
            rend = tex(e)
            self.assertEqual(rend, wanted_render[i])

    def test_slash(self):
        pass


class TesttxtRender(unittest.TestCase):
    """Testing functions from mapytex.calculus.renders.txt"""

    def test_type_render_int(self):
        self.assertEqual(txt([2]), "2")

    def test_type_render_str(self):
        self.assertEqual(txt(["a"]), "a")

    def test_type_render_float(self):
        self.assertEqual(txt([12.345]), "12.345")

    def test_type_render_fraction(self):
        self.assertEqual(txt([Fraction(1, 2)]), "1 / 2")

    def test_mult_interger(self):
        exps = [[2, 3, op.mul],
                [2, -3, op.mul],
                [-2, 3, op.mul]]
        wanted_render = ["2 * 3", "2 * ( -3 )", "-2 * 3"]
        for (i, e) in enumerate(exps):
            rend = txt(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mult_letter(self):
        exps = [[2, "a", op.mul],
                ["a", 3, op.mul],
                [-2, "a", op.mul],
                ["a", -2, op.mul],
                ["a", -2, op.mul, -2, op.mul],
                ["a", -2, op.mul, "a", op.mul],
                ]
        wanted_render = ["2 a",
                         "a * 3",
                         "-2 a",
                         "a * ( -2 )",
                         "a * ( -2 ) * ( -2 )",
                         "a * ( -2 ) a",
                         ]
        for (i, e) in enumerate(exps):
            rend = txt(e)
            self.assertEqual(rend, wanted_render[i])

    def test_mult_fraction(self):
        exps = [[2, Fraction(1, 2), op.mul],
                [Fraction(1, 2), 3, op.mul]]
        wanted_render = ["2 * 1 / 2", "1 / 2 * 3"]
        for (i, e) in enumerate(exps):
            rend = txt(e)
            self.assertEqual(rend, wanted_render[i])

    def test_parentheses(self):
        mul = op.get_op("*", 2)
        add = op.get_op("+", 2)
        exps = [
            [2, 3, add, 4, mul],
            [2, 3, mul, 4, add],
            [2, 3, 4, mul, add],
            [2, 3, 4, add, add],
        ]
        wanted_render = [
            '( 2 + 3 ) * 4',
            '2 * 3 + 4',
            '2 + 3 * 4',
            '2 + 3 + 4',
        ]
        for (i, e) in enumerate(exps):
            rend = txt(e)
            self.assertEqual(rend, wanted_render[i])

    def test_slash(self):
        pass

    def test_mass_add(self):
        permu = mass_poly_test("+", 5)
        from .mass_test import POLY_ADD_VALID_RESULTS
        for (i, v) in enumerate(permu):
            self.assertEqual(txt(v), POLY_ADD_VALID_RESULTS[i])

    def test_mass_sub(self):
        permu = mass_poly_test("-", 5)
        from .mass_test import POLY_SUB_VALID_RESULTS
        for (i, v) in enumerate(permu):
            self.assertEqual(txt(v), POLY_SUB_VALID_RESULTS[i])

    def test_mass_mul(self):
        permu = mass_poly_test("*", 5)
        from .mass_test import TXT_POLY_MUL_VALID_RESULTS
        for (i, v) in enumerate(permu):
            self.assertEqual(txt(v), TXT_POLY_MUL_VALID_RESULTS[i])


if __name__ == '__main__':
    unittest.main()


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