"""
Copied from Pandas: https://github.com/pydata/pandas/blob/master/pandas/src/khash.pxd
"""
from cpython cimport PyObject
from numpy cimport int64_t, int32_t, uint32_t, float64_t, float32_t

cdef extern from "khash.h":
    ctypedef uint32_t khint_t
    ctypedef khint_t khiter_t

    # ctypedef struct kh_pymap_t:
    #     khint_t n_buckets, size, n_occupied, upper_bound
    #     uint32_t *flags
    #     PyObject **keys
    #     Py_ssize_t *vals

    # inline kh_pymap_t* kh_init_pymap()
    # inline void kh_destroy_pymap(kh_pymap_t*)
    # inline void kh_clear_pymap(kh_pymap_t*)
    # inline khint_t kh_get_pymap(kh_pymap_t*, PyObject*)
    # inline void kh_resize_pymap(kh_pymap_t*, khint_t)
    # inline khint_t kh_put_pymap(kh_pymap_t*, PyObject*, int*)
    # inline void kh_del_pymap(kh_pymap_t*, khint_t)

    # bint kh_exist_pymap(kh_pymap_t*, khiter_t)

    # ctypedef struct kh_pyset_t:
    #     khint_t n_buckets, size, n_occupied, upper_bound
    #     uint32_t *flags
    #     PyObject **keys
    #     Py_ssize_t *vals

    # inline kh_pyset_t* kh_init_pyset()
    # inline void kh_destroy_pyset(kh_pyset_t*)
    # inline void kh_clear_pyset(kh_pyset_t*)
    # inline khint_t kh_get_pyset(kh_pyset_t*, PyObject*)
    # inline void kh_resize_pyset(kh_pyset_t*, khint_t)
    # inline khint_t kh_put_pyset(kh_pyset_t*, PyObject*, int*)
    # inline void kh_del_pyset(kh_pyset_t*, khint_t)

    # bint kh_exist_pyset(kh_pyset_t*, khiter_t)

    # ctypedef char* kh_cstr_t

    # ctypedef struct kh_str_t:
    #     khint_t n_buckets, size, n_occupied, upper_bound
    #     uint32_t *flags
    #     kh_cstr_t *keys
    #     Py_ssize_t *vals

    # inline kh_str_t* kh_init_str()
    # inline void kh_destroy_str(kh_str_t*)
    # inline void kh_clear_str(kh_str_t*)
    # inline khint_t kh_get_str(kh_str_t*, kh_cstr_t)
    # inline void kh_resize_str(kh_str_t*, khint_t)
    # inline khint_t kh_put_str(kh_str_t*, kh_cstr_t, int*)
    # inline void kh_del_str(kh_str_t*, khint_t)

    # bint kh_exist_str(kh_str_t*, khiter_t)

    ctypedef struct kh_int64_t:
        khint_t n_buckets, size, n_occupied, upper_bound
        uint32_t *flags
        int64_t *keys
        float64_t *vals                 # values in hashtable are in float64 type

    inline kh_int64_t* kh_init_int64()
    inline void kh_destroy_int64(kh_int64_t*)
    inline void kh_clear_int64(kh_int64_t*)
    inline khint_t kh_get_int64(kh_int64_t*, int64_t)
    inline void kh_resize_int64(kh_int64_t*, khint_t)
    inline khint_t kh_put_int64(kh_int64_t*, int64_t, int*)
    inline void kh_del_int64(kh_int64_t*, khint_t)

    bint kh_exist_int64(kh_int64_t*, khiter_t)

    ctypedef struct kh_float64_t:
        khint_t n_buckets, size, n_occupied, upper_bound
        uint32_t *flags
        float64_t *keys
        float64_t *vals
        
    inline kh_float64_t* kh_init_float64()
    inline void kh_destroy_float64(kh_float64_t*)
    inline void kh_clear_float64(kh_float64_t*)
    inline khint_t kh_get_float64(kh_float64_t*, float64_t)
    inline void kh_resize_float64(kh_float64_t*, khint_t)
    inline khint_t kh_put_float64(kh_float64_t*, float64_t, int*)
    inline void kh_del_float64(kh_float64_t*, khint_t)

    bint kh_exist_float64(kh_float64_t*, khiter_t)