import sympy as sp

from pystencils import Assignment, AssignmentCollection
from pystencils.simp.assignment_collection import SymbolGen


def test_assignment_collection():
    x, y, z, t = sp.symbols("x y z t")
    symbol_gen = SymbolGen("a")

    ac = AssignmentCollection([Assignment(z, x + y)],
                              [], subexpression_symbol_generator=symbol_gen)

    lhs = ac.add_subexpression(t)
    assert lhs == sp.Symbol("a_0")
    ac.subexpressions.append(Assignment(t, 3))
    ac.topological_sort(sort_main_assignments=False, sort_subexpressions=True)
    assert ac.subexpressions[0].lhs == t

    assert ac.new_with_inserted_subexpression(sp.Symbol("not_defined")) == ac
    ac_inserted = ac.new_with_inserted_subexpression(t)
    ac_inserted2 = ac.new_without_subexpressions({lhs})
    assert all(a == b for a, b in zip(ac_inserted.all_assignments, ac_inserted2.all_assignments))

    print(ac_inserted)
    assert ac_inserted.subexpressions[0] == Assignment(lhs, 3)

    assert 'a_0' in str(ac_inserted)
    assert '<table' in ac_inserted._repr_html_()