import pytest

from myfasthtml.core.utils import flatten


@pytest.mark.parametrize("input_args,expected,test_description", [
    # Simple list without nesting
    (([1, 2, 3],), [1, 2, 3], "simple list"),
    
    # Nested list (one level)
    (([1, [2, 3], 4],), [1, 2, 3, 4], "nested list one level"),
    
    # Nested tuple
    (((1, (2, 3), 4),), [1, 2, 3, 4], "nested tuple"),
    
    # Mixed list and tuple
    (([1, (2, 3), [4, 5]],), [1, 2, 3, 4, 5], "mixed list and tuple"),
    
    # Deeply nested structure
    (([1, [2, [3, [4, 5]]]],), [1, 2, 3, 4, 5], "deeply nested structure"),
    
    # Empty list
    (([],), [], "empty list"),
    
    # Empty nested lists
    (([1, [], [2, []], 3],), [1, 2, 3], "empty nested lists"),
    
    # Preserves order
    (([[3, 1], [4, 2]],), [3, 1, 4, 2], "preserves order"),
    
    # Strings (should not be iterated)
    ((["hello", ["world"]],), ["hello", "world"], "strings not iterated"),
    
    # Mixed types
    (([1, "text", [2.5, True], None],), [1, "text", 2.5, True, None], "mixed types"),
    
    # Multiple arguments with lists
    (([1, 2], [3, 4], 5), [1, 2, 3, 4, 5], "multiple arguments with lists"),
    
    # Scalar values only
    ((1, 2, 3), [1, 2, 3], "scalar values only"),
    
    # Mixed scalars and lists
    ((1, [2, 3], 4, [5, 6]), [1, 2, 3, 4, 5, 6], "mixed scalars and lists"),
    
    # Multiple nested arguments
    (([1, [2]], [3, [4]], 5), [1, 2, 3, 4, 5], "multiple nested arguments"),
    
    # No arguments
    ((), [], "no arguments"),
    
    # Complex real-world example
    (([1, [2, 3], [[4, 5], [6, 7]], [[[8, 9]]], 10],), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], "complex nesting"),
])
def test_i_can_flatten(input_args, expected, test_description):
  """Test that flatten correctly handles various nested structures and arguments."""
  result = flatten(*input_args)
  assert result == expected, f"Failed for test case: {test_description}"