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use libc::{c_char, c_int, c_void};

use crate::object::*;
use crate::pyport::Py_ssize_t;

#[repr(C)]
#[derive(Copy, Clone)]
pub struct PyCodeObject {
    #[cfg(py_sys_config = "Py_TRACE_REFS")]
    pub _ob_next: *mut PyObject,
    #[cfg(py_sys_config = "Py_TRACE_REFS")]
    pub _ob_prev: *mut PyObject,
    pub ob_refcnt: Py_ssize_t,
    pub ob_type: *mut PyTypeObject,
    pub co_argcount: c_int,
    pub co_nlocals: c_int,
    pub co_stacksize: c_int,
    pub co_flags: c_int,
    pub co_code: *mut PyObject,
    pub co_consts: *mut PyObject,
    pub co_names: *mut PyObject,
    pub co_varnames: *mut PyObject,
    pub co_freevars: *mut PyObject,
    pub co_cellvars: *mut PyObject,
    pub co_filename: *mut PyObject,
    pub co_name: *mut PyObject,
    pub co_firstlineno: c_int,
    pub co_lnotab: *mut PyObject,
    pub co_zombieframe: *mut c_void,
    pub co_weakreflist: *mut PyObject,
}

/* Masks for co_flags */
pub const CO_OPTIMIZED: c_int = 0x0001;
pub const CO_NEWLOCALS: c_int = 0x0002;
pub const CO_VARARGS: c_int = 0x0004;
pub const CO_VARKEYWORDS: c_int = 0x0008;
pub const CO_NESTED: c_int = 0x0010;
pub const CO_GENERATOR: c_int = 0x0020;
/* The CO_NOFREE flag is set if there are no free or cell variables.
   This information is redundant, but it allows a single flag test
   to determine whether there is any extra work to be done when the
   call frame it setup.
*/
pub const CO_NOFREE: c_int = 0x0040;

pub const CO_FUTURE_DIVISION: c_int = 0x2000;
pub const CO_FUTURE_ABSOLUTE_IMPORT: c_int = 0x4000; /* do absolute imports by default */
pub const CO_FUTURE_WITH_STATEMENT: c_int = 0x8000;
pub const CO_FUTURE_PRINT_FUNCTION: c_int = 0x10000;
pub const CO_FUTURE_UNICODE_LITERALS: c_int = 0x20000;

pub const CO_MAXBLOCKS: usize = 20;

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub static mut PyCode_Type: PyTypeObject;

    pub fn PyCode_New(
        arg1: c_int,
        arg2: c_int,
        arg3: c_int,
        arg4: c_int,
        arg5: *mut PyObject,
        arg6: *mut PyObject,
        arg7: *mut PyObject,
        arg8: *mut PyObject,
        arg9: *mut PyObject,
        arg10: *mut PyObject,
        arg11: *mut PyObject,
        arg12: *mut PyObject,
        arg13: c_int,
        arg14: *mut PyObject,
    ) -> *mut PyCodeObject;
    pub fn PyCode_NewEmpty(
        filename: *const c_char,
        funcname: *const c_char,
        firstlineno: c_int,
    ) -> *mut PyCodeObject;
    pub fn PyCode_Addr2Line(arg1: *mut PyCodeObject, arg2: c_int) -> c_int;
    //fn _PyCode_CheckLineNumber(co: *mut PyCodeObject,
    //                               lasti: c_int,
    //                               bounds: *mut PyAddrPair) -> c_int;
    pub fn PyCode_Optimize(
        code: *mut PyObject,
        consts: *mut PyObject,
        names: *mut PyObject,
        lineno_obj: *mut PyObject,
    ) -> *mut PyObject;
}

#[inline(always)]
pub unsafe fn PyCode_Check(op: *mut PyObject) -> c_int {
    (Py_TYPE(op) == &mut PyCode_Type) as c_int
}

#[inline]
pub unsafe fn PyCode_GetNumFree(op: *mut PyCodeObject) -> Py_ssize_t {
    crate::tupleobject::PyTuple_GET_SIZE((*op).co_freevars)
}