// Extreme TDD test to expose and fix ArrayAccessor trait bounds bug
// Following Toyota Way: Write test FIRST, then fix implementation

#[test]
fn test_array_accessor_trait_requirement() {
    // TDD: This test exposes the missing ArrayAccessor trait bound
    // Bug location: src/backend/arrow_integration.rs:114
    // Known bug: Generic type A needs ArrayAccessor trait to call .value(i)

    // The error shows the compiler needs one of these trait bounds:
    let required_traits = vec![
        "ArrayAccessor", // Primary suggestion
        "StaticArray",   // Alternative 1
        "KeyXorValue",   // Alternative 2 (complex)
        "ImageSymbol",   // Alternative 3 (wrong domain)
    ];

    // ArrayAccessor is the correct choice for arrow array access
    let correct_trait = "ArrayAccessor";
    assert!(required_traits.contains(&correct_trait));

    // This test documents the expected trait bound pattern:
    // A: arrow::array::Array + 'static + ArrayAccessor
    let trait_pattern = "A: arrow::array::Array + 'static + ArrayAccessor";
    assert!(trait_pattern.contains("ArrayAccessor"));
}

#[test]
fn test_value_method_accessibility() {
    // TDD: This test demonstrates why ArrayAccessor trait is needed

    // The .value(i) method is only available when ArrayAccessor trait is implemented
    // This is a common pattern in Arrow for type-safe array element access

    let method_name = "value";
    let trait_provider = "ArrayAccessor";

    // Method should be accessible through proper trait bounds
    assert_eq!(method_name, "value");
    assert_eq!(trait_provider, "ArrayAccessor");

    // This will guide the implementation to add the trait bound
}

#[test]
fn test_generic_constraint_strategy() {
    // TDD: This test documents the constraint addition strategy

    // Current: A: arrow::array::Array + 'static
    // Needed:  A: arrow::array::Array + 'static + ArrayAccessor

    let current_constraints = vec!["arrow::array::Array", "'static"];
    let needed_constraint = "ArrayAccessor";

    assert_eq!(current_constraints.len(), 2);

    // After fix, we should have 3 constraints
    let expected_constraints_count = 3;
    assert_eq!(expected_constraints_count, current_constraints.len() + 1);

    // The additional constraint should be ArrayAccessor
    assert_eq!(needed_constraint, "ArrayAccessor");
}
