use pyo3::prelude::*;
use pyo3::{types::PyType, wrap_pyfunction, wrap_pymodule, PyCell};

mod common;

#[test]
fn class_without_docs_or_signature() {
    #[pyclass]
    struct MyClass {}

    let gil = Python::acquire_gil();
    let py = gil.python();
    let typeobj = py.get_type::<MyClass>();

    py_assert!(py, typeobj, "typeobj.__doc__ is None");
    py_assert!(py, typeobj, "typeobj.__text_signature__ is None");
}

#[test]
fn class_with_docs() {
    /// docs line1
    #[pyclass]
    /// docs line2
    struct MyClass {}

    let gil = Python::acquire_gil();
    let py = gil.python();
    let typeobj = py.get_type::<MyClass>();

    py_assert!(py, typeobj, "typeobj.__doc__ == 'docs line1\\ndocs line2'");
    py_assert!(py, typeobj, "typeobj.__text_signature__ is None");
}

// Ignored because heap types don't have working __text_signature__:
// https://github.com/python/cpython/blob/master/Objects/typeobject.c#L864-L870
#[test]
#[ignore]
fn class_with_docs_and_signature() {
    /// docs line1
    #[pyclass]
    /// docs line2
    #[text_signature = "(a, b=None, *, c=42)"]
    /// docs line3
    struct MyClass {}

    #[pymethods]
    impl MyClass {
        #[new]
        #[args(a, b = "None", "*", c = 42)]
        fn __new__(a: i32, b: Option<i32>, c: i32) -> Self {
            let _ = (a, b, c);
            Self {}
        }
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let typeobj = py.get_type::<MyClass>();

    py_assert!(
        py,
        typeobj,
        "typeobj.__doc__ == 'docs line1\\ndocs line2\\ndocs line3'"
    );
    py_assert!(
        py,
        typeobj,
        "typeobj.__text_signature__ == '(a, b=None, *, c=42)'"
    );
}

// Ignored because heap types don't have working __text_signature__:
// https://github.com/python/cpython/blob/master/Objects/typeobject.c#L864-L870
#[test]
#[ignore]
fn class_with_signature() {
    #[pyclass]
    #[text_signature = "(a, b=None, *, c=42)"]
    struct MyClass {}

    #[pymethods]
    impl MyClass {
        #[new]
        #[args(a, b = "None", "*", c = 42)]
        fn __new__(a: i32, b: Option<i32>, c: i32) -> Self {
            let _ = (a, b, c);
            Self {}
        }
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let typeobj = py.get_type::<MyClass>();

    py_assert!(py, typeobj, "typeobj.__doc__ is None");
    py_assert!(
        py,
        typeobj,
        "typeobj.__text_signature__ == '(a, b=None, *, c=42)'"
    );
}

#[test]
fn test_function() {
    #[pyfunction(a, b = "None", "*", c = 42)]
    #[text_signature = "(a, b=None, *, c=42)"]
    fn my_function(a: i32, b: Option<i32>, c: i32) {
        let _ = (a, b, c);
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let f = wrap_pyfunction!(my_function)(py).unwrap();

    py_assert!(py, f, "f.__text_signature__ == '(a, b=None, *, c=42)'");
}

#[test]
fn test_pyfn() {
    #[pymodule]
    fn my_module(_py: Python, m: &PyModule) -> PyResult<()> {
        #[pyfn(m, "my_function", a, b = "None", "*", c = 42)]
        #[text_signature = "(a, b=None, *, c=42)"]
        fn my_function(a: i32, b: Option<i32>, c: i32) {
            let _ = (a, b, c);
        }
        Ok(())
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let m = wrap_pymodule!(my_module)(py);

    py_assert!(
        py,
        m,
        "m.my_function.__text_signature__ == '(a, b=None, *, c=42)'"
    );
}

#[test]
fn test_methods() {
    #[pyclass]
    struct MyClass {}

    #[pymethods]
    impl MyClass {
        #[text_signature = "($self, a)"]
        fn method(&self, a: i32) {
            let _ = a;
        }
        #[text_signature = "($self, b)"]
        fn pyself_method(_this: &PyCell<Self>, b: i32) {
            let _ = b;
        }
        #[classmethod]
        #[text_signature = "($cls, c)"]
        fn class_method(_cls: &PyType, c: i32) {
            let _ = c;
        }
        #[staticmethod]
        #[text_signature = "(d)"]
        fn static_method(d: i32) {
            let _ = d;
        }
    }

    let gil = Python::acquire_gil();
    let py = gil.python();
    let typeobj = py.get_type::<MyClass>();

    py_assert!(
        py,
        typeobj,
        "typeobj.method.__text_signature__ == '($self, a)'"
    );
    py_assert!(
        py,
        typeobj,
        "typeobj.pyself_method.__text_signature__ == '($self, b)'"
    );
    py_assert!(
        py,
        typeobj,
        "typeobj.class_method.__text_signature__ == '($cls, c)'"
    );
    py_assert!(
        py,
        typeobj,
        "typeobj.static_method.__text_signature__ == '(d)'"
    );
}