/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Glenn Ruben Bakke
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <string.h>
#include "py/obj.h"
#include "py/runtime.h"
#include "py/objstr.h"
#include "py/objlist.h"

#if MICROPY_PY_UBLUEPY

#include "ble_drv.h"

STATIC void ubluepy_peripheral_print(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind) {
    ubluepy_peripheral_obj_t * self = (ubluepy_peripheral_obj_t *)o;
    (void)self;
    mp_printf(print, "Peripheral(conn_handle: " HEX2_FMT ")",
              self->conn_handle);
}

STATIC void gap_event_handler(mp_obj_t self_in, uint16_t event_id, uint16_t conn_handle, uint16_t length, uint8_t * data) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    if (event_id == 16) {                // connect event
        self->conn_handle = conn_handle;
    } else if (event_id == 17) {         // disconnect event
        self->conn_handle = 0xFFFF;      // invalid connection handle
    }

    if (self->conn_handler != mp_const_none) {
        mp_obj_t args[3];
        mp_uint_t num_of_args = 3;
        args[0] = MP_OBJ_NEW_SMALL_INT(event_id);
        args[1] = MP_OBJ_NEW_SMALL_INT(conn_handle);
        if (data != NULL) {
            args[2] = mp_obj_new_bytearray_by_ref(length, data);
        } else {
            args[2] = mp_const_none;
        }

        // for now hard-code all events to conn_handler
        mp_call_function_n_kw(self->conn_handler, num_of_args, 0, args);
    }

    (void)self;
}

STATIC void gatts_event_handler(mp_obj_t self_in, uint16_t event_id, uint16_t attr_handle, uint16_t length, uint8_t * data) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    if (self->conn_handler != mp_const_none) {
        mp_obj_t args[3];
        mp_uint_t num_of_args = 3;
        args[0] = MP_OBJ_NEW_SMALL_INT(event_id);
        args[1] = MP_OBJ_NEW_SMALL_INT(attr_handle);
        if (data != NULL) {
            args[2] = mp_obj_new_bytearray_by_ref(length, data);
        } else {
            args[2] = mp_const_none;
        }

        // for now hard-code all events to conn_handler
        mp_call_function_n_kw(self->conn_handler, num_of_args, 0, args);
    }

}

#if MICROPY_PY_UBLUEPY_CENTRAL

static volatile bool m_disc_evt_received;

STATIC void gattc_event_handler(mp_obj_t self_in, uint16_t event_id, uint16_t attr_handle, uint16_t length, uint8_t * data) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);
    (void)self;
    m_disc_evt_received = true;
}
#endif

STATIC mp_obj_t ubluepy_peripheral_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
    enum {
        ARG_NEW_DEVICE_ADDR,
        ARG_NEW_ADDR_TYPE
    };

    static const mp_arg_t allowed_args[] = {
        { ARG_NEW_DEVICE_ADDR, MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { ARG_NEW_ADDR_TYPE,   MP_ARG_OBJ, {.u_obj = mp_const_none} },
    };

    // parse args
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    ubluepy_peripheral_obj_t *s = mp_obj_malloc(ubluepy_peripheral_obj_t, type);

    s->delegate      = mp_const_none;
    s->conn_handler  = mp_const_none;
    s->notif_handler = mp_const_none;
    s->conn_handle   = 0xFFFF;

    s->service_list = mp_obj_new_list(0, NULL);

    return MP_OBJ_FROM_PTR(s);
}

/// \method withDelegate(DefaultDelegate)
/// Set delegate instance for handling Bluetooth LE events.
///
STATIC mp_obj_t peripheral_with_delegate(mp_obj_t self_in, mp_obj_t delegate) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    self->delegate = delegate;

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(ubluepy_peripheral_with_delegate_obj, peripheral_with_delegate);

/// \method setNotificationHandler(func)
/// Set handler for Bluetooth LE notification events.
///
STATIC mp_obj_t peripheral_set_notif_handler(mp_obj_t self_in, mp_obj_t func) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    self->notif_handler = func;

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(ubluepy_peripheral_set_notif_handler_obj, peripheral_set_notif_handler);

/// \method setConnectionHandler(func)
/// Set handler for Bluetooth LE connection events.
///
STATIC mp_obj_t peripheral_set_conn_handler(mp_obj_t self_in, mp_obj_t func) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    self->conn_handler = func;

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(ubluepy_peripheral_set_conn_handler_obj, peripheral_set_conn_handler);

#if MICROPY_PY_UBLUEPY_PERIPHERAL

/// \method advertise(device_name, [service=[service1, service2, ...]], [data=bytearray], [connectable=True])
/// Start advertising. Connectable advertisement type by default.
///
STATIC mp_obj_t peripheral_advertise(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_device_name, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { MP_QSTR_services,    MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { MP_QSTR_data,        MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { MP_QSTR_connectable, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
    };

    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);

    self->role = UBLUEPY_ROLE_PERIPHERAL;

    // parse args
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    // ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
    mp_obj_t device_name_obj = args[0].u_obj;
    mp_obj_t service_obj     = args[1].u_obj;
    mp_obj_t data_obj        = args[2].u_obj;
    mp_obj_t connectable_obj = args[3].u_obj;

    ubluepy_advertise_data_t adv_data;
    memset(&adv_data, 0, sizeof(ubluepy_advertise_data_t));

    if (device_name_obj != mp_const_none && mp_obj_is_str(device_name_obj)) {
        size_t str_len;
        adv_data.p_device_name = (uint8_t *)mp_obj_str_get_data(device_name_obj, &str_len);
        adv_data.device_name_len = str_len;
    }

    if (service_obj != mp_const_none) {
        mp_obj_t * services = NULL;
        mp_uint_t  num_services;
        mp_obj_get_array(service_obj, &num_services, &services);

        if (num_services > 0) {
            adv_data.p_services      = services;
            adv_data.num_of_services = num_services;
        }
    }

    if (data_obj != mp_const_none) {
        mp_buffer_info_t bufinfo;
        mp_get_buffer_raise(data_obj, &bufinfo, MP_BUFFER_READ);

        if (bufinfo.len > 0) {
            adv_data.p_data   = bufinfo.buf;
            adv_data.data_len = bufinfo.len;
        }
    }

    adv_data.connectable = true;
    if (connectable_obj != mp_const_none && !(mp_obj_is_true(connectable_obj))) {
        adv_data.connectable = false;
    } else {
        ble_drv_gap_event_handler_set(MP_OBJ_FROM_PTR(self), gap_event_handler);
        ble_drv_gatts_event_handler_set(MP_OBJ_FROM_PTR(self), gatts_event_handler);
    }

    (void)ble_drv_advertise_data(&adv_data);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(ubluepy_peripheral_advertise_obj, 0, peripheral_advertise);

/// \method advertise_stop()
/// Stop advertisement if any onging advertisement.
///
STATIC mp_obj_t peripheral_advertise_stop(mp_obj_t self_in) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    (void)self;

    ble_drv_advertise_stop();

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(ubluepy_peripheral_advertise_stop_obj, peripheral_advertise_stop);

#endif // MICROPY_PY_UBLUEPY_PERIPHERAL

/// \method disconnect()
/// disconnect connection.
///
STATIC mp_obj_t peripheral_disconnect(mp_obj_t self_in) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(self_in);

    (void)self;

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(ubluepy_peripheral_disconnect_obj, peripheral_disconnect);

/// \method addService(Service)
/// Add service to the Peripheral.
///
STATIC mp_obj_t peripheral_add_service(mp_obj_t self_in, mp_obj_t service) {
    ubluepy_peripheral_obj_t * self = MP_OBJ_TO_PTR(self_in);
    ubluepy_service_obj_t    * p_service = MP_OBJ_TO_PTR(service);

    p_service->p_periph = self;

    mp_obj_list_append(self->service_list, service);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(ubluepy_peripheral_add_service_obj, peripheral_add_service);

/// \method getServices()
/// Return list with all service registered in the Peripheral.
///
STATIC mp_obj_t peripheral_get_services(mp_obj_t self_in) {
    ubluepy_peripheral_obj_t * self = MP_OBJ_TO_PTR(self_in);

    return self->service_list;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(ubluepy_peripheral_get_services_obj, peripheral_get_services);

#if MICROPY_PY_UBLUEPY_CENTRAL

void static disc_add_service(mp_obj_t self, ble_drv_service_data_t * p_service_data) {
    ubluepy_service_obj_t * p_service = mp_obj_malloc(ubluepy_service_obj_t, &ubluepy_service_type);

    ubluepy_uuid_obj_t * p_uuid = mp_obj_malloc(ubluepy_uuid_obj_t, &ubluepy_uuid_type);

    p_service->p_uuid = p_uuid;

    p_uuid->type = p_service_data->uuid_type;
    p_uuid->value[0] = p_service_data->uuid & 0xFF;
    p_uuid->value[1] = p_service_data->uuid >> 8;

    p_service->handle       = p_service_data->start_handle;
    p_service->start_handle = p_service_data->start_handle;
    p_service->end_handle   = p_service_data->end_handle;

    p_service->char_list = mp_obj_new_list(0, NULL);

    peripheral_add_service(self, MP_OBJ_FROM_PTR(p_service));
}

void static disc_add_char(mp_obj_t service_in, ble_drv_char_data_t * p_desc_data) {
    ubluepy_service_obj_t        * p_service   = MP_OBJ_TO_PTR(service_in);
    ubluepy_characteristic_obj_t * p_char = mp_obj_malloc(ubluepy_characteristic_obj_t, &ubluepy_characteristic_type);

    ubluepy_uuid_obj_t * p_uuid = mp_obj_malloc(ubluepy_uuid_obj_t, &ubluepy_uuid_type);

    p_char->p_uuid = p_uuid;

    p_uuid->type = p_desc_data->uuid_type;
    p_uuid->value[0] = p_desc_data->uuid & 0xFF;
    p_uuid->value[1] = p_desc_data->uuid >> 8;

    // add characteristic specific data from discovery
    p_char->props  = p_desc_data->props;
    p_char->handle = p_desc_data->value_handle;

    // equivalent to ubluepy_service.c - service_add_characteristic()
    // except the registration of the characteristic towards the bluetooth stack
    p_char->service_handle = p_service->handle;
    p_char->p_service      = p_service;

    mp_obj_list_append(p_service->char_list, MP_OBJ_FROM_PTR(p_char));
}

/// \method connect(device_address [, addr_type=ADDR_TYPE_PUBLIC])
/// Connect to device peripheral with the given device address.
/// addr_type can be either ADDR_TYPE_PUBLIC (default) or
/// ADDR_TYPE_RANDOM_STATIC.
///
STATIC mp_obj_t peripheral_connect(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    ubluepy_peripheral_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
    mp_obj_t dev_addr              = pos_args[1];

    self->role = UBLUEPY_ROLE_CENTRAL;

    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_addr_type, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UBLUEPY_ADDR_TYPE_PUBLIC } },
    };

    // parse args
    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args - 2, pos_args + 2, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    uint8_t addr_type = args[0].u_int;

    ble_drv_gap_event_handler_set(MP_OBJ_FROM_PTR(self), gap_event_handler);

    if (mp_obj_is_str(dev_addr)) {
        size_t str_len;
        const byte *str_data = (const byte *)mp_obj_str_get_data(dev_addr, &str_len);
        if (str_len == 17) { // Example "11:22:33:aa:bb:cc"

            uint8_t * p_addr = m_new(uint8_t, 6);

            p_addr[0]  = unichar_xdigit_value(str_data[16]);
            p_addr[0] += unichar_xdigit_value(str_data[15]) << 4;
            p_addr[1]  = unichar_xdigit_value(str_data[13]);
            p_addr[1] += unichar_xdigit_value(str_data[12]) << 4;
            p_addr[2]  = unichar_xdigit_value(str_data[10]);
            p_addr[2] += unichar_xdigit_value(str_data[9]) << 4;
            p_addr[3]  = unichar_xdigit_value(str_data[7]);
            p_addr[3] += unichar_xdigit_value(str_data[6]) << 4;
            p_addr[4]  = unichar_xdigit_value(str_data[4]);
            p_addr[4] += unichar_xdigit_value(str_data[3]) << 4;
            p_addr[5]  = unichar_xdigit_value(str_data[1]);
            p_addr[5] += unichar_xdigit_value(str_data[0]) << 4;

            ble_drv_connect(p_addr, addr_type);

            m_del(uint8_t, p_addr, 6);
        }
    }

    // block until connected
    while (self->conn_handle == 0xFFFF) {
        ;
    }

    ble_drv_gattc_event_handler_set(MP_OBJ_FROM_PTR(self), gattc_event_handler);

    bool service_disc_retval = ble_drv_discover_services(self, self->conn_handle, 0x0001, disc_add_service);

    // continue discovery of primary services ...
    while (service_disc_retval) {
        // locate the last added service
        mp_obj_t * services = NULL;
        mp_uint_t  num_services;
        mp_obj_get_array(self->service_list, &num_services, &services);

        ubluepy_service_obj_t * p_service = (ubluepy_service_obj_t *)services[num_services - 1];

        service_disc_retval = ble_drv_discover_services(self,
                                                        self->conn_handle,
                                                        p_service->end_handle + 1,
                                                        disc_add_service);
    }

    // For each service perform a characteristic discovery
    mp_obj_t * services = NULL;
    mp_uint_t  num_services;
    mp_obj_get_array(self->service_list, &num_services, &services);

    for (uint16_t s = 0; s < num_services; s++) {
        ubluepy_service_obj_t * p_service = (ubluepy_service_obj_t *)services[s];
        bool char_disc_retval = ble_drv_discover_characteristic(p_service,
                                                                self->conn_handle,
                                                                p_service->start_handle,
                                                                p_service->end_handle,
                                                                disc_add_char);
        // continue discovery of characteristics ...
        while (char_disc_retval) {
            mp_obj_t * characteristics = NULL;
            mp_uint_t  num_chars;
            mp_obj_get_array(p_service->char_list, &num_chars, &characteristics);

            ubluepy_characteristic_obj_t * p_char = (ubluepy_characteristic_obj_t *)characteristics[num_chars - 1];
            uint16_t next_handle = p_char->handle + 1;
            if ((next_handle) < p_service->end_handle) {
                char_disc_retval = ble_drv_discover_characteristic(p_service,
                                                                   self->conn_handle,
                                                                   next_handle,
                                                                   p_service->end_handle,
                                                                   disc_add_char);
            } else {
                break;
            }
        }
    }

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(ubluepy_peripheral_connect_obj, 2, peripheral_connect);

#endif

STATIC const mp_rom_map_elem_t ubluepy_peripheral_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_withDelegate),           MP_ROM_PTR(&ubluepy_peripheral_with_delegate_obj) },
    { MP_ROM_QSTR(MP_QSTR_setNotificationHandler), MP_ROM_PTR(&ubluepy_peripheral_set_notif_handler_obj) },
    { MP_ROM_QSTR(MP_QSTR_setConnectionHandler),   MP_ROM_PTR(&ubluepy_peripheral_set_conn_handler_obj) },
    { MP_ROM_QSTR(MP_QSTR_getServices),            MP_ROM_PTR(&ubluepy_peripheral_get_services_obj) },
#if MICROPY_PY_UBLUEPY_CENTRAL
    { MP_ROM_QSTR(MP_QSTR_connect),                MP_ROM_PTR(&ubluepy_peripheral_connect_obj) },
#if 0
    { MP_ROM_QSTR(MP_QSTR_disconnect),             MP_ROM_PTR(&ubluepy_peripheral_disconnect_obj) },
    { MP_ROM_QSTR(MP_QSTR_getServiceByUUID),       MP_ROM_PTR(&ubluepy_peripheral_get_service_by_uuid_obj) },
    { MP_ROM_QSTR(MP_QSTR_getCharacteristics),     MP_ROM_PTR(&ubluepy_peripheral_get_chars_obj) },
    { MP_ROM_QSTR(MP_QSTR_getDescriptors),         MP_ROM_PTR(&ubluepy_peripheral_get_descs_obj) },
    { MP_ROM_QSTR(MP_QSTR_waitForNotifications),   MP_ROM_PTR(&ubluepy_peripheral_wait_for_notif_obj) },
    { MP_ROM_QSTR(MP_QSTR_writeCharacteristic),    MP_ROM_PTR(&ubluepy_peripheral_write_char_obj) },
    { MP_ROM_QSTR(MP_QSTR_readCharacteristic),     MP_ROM_PTR(&ubluepy_peripheral_read_char_obj) },
#endif // 0
#endif // MICROPY_PY_UBLUEPY_CENTRAL
#if MICROPY_PY_UBLUEPY_PERIPHERAL
    { MP_ROM_QSTR(MP_QSTR_advertise),              MP_ROM_PTR(&ubluepy_peripheral_advertise_obj) },
    { MP_ROM_QSTR(MP_QSTR_advertise_stop),         MP_ROM_PTR(&ubluepy_peripheral_advertise_stop_obj) },
    { MP_ROM_QSTR(MP_QSTR_disconnect),             MP_ROM_PTR(&ubluepy_peripheral_disconnect_obj) },
    { MP_ROM_QSTR(MP_QSTR_addService),             MP_ROM_PTR(&ubluepy_peripheral_add_service_obj) },
#if 0
    { MP_ROM_QSTR(MP_QSTR_addCharacteristic),      MP_ROM_PTR(&ubluepy_peripheral_add_char_obj) },
    { MP_ROM_QSTR(MP_QSTR_addDescriptor),          MP_ROM_PTR(&ubluepy_peripheral_add_desc_obj) },
    { MP_ROM_QSTR(MP_QSTR_writeCharacteristic),    MP_ROM_PTR(&ubluepy_peripheral_write_char_obj) },
    { MP_ROM_QSTR(MP_QSTR_readCharacteristic),     MP_ROM_PTR(&ubluepy_peripheral_read_char_obj) },
#endif
#endif
#if MICROPY_PY_UBLUEPY_BROADCASTER
    { MP_ROM_QSTR(MP_QSTR_advertise),              MP_ROM_PTR(&ubluepy_peripheral_advertise_obj) },
#endif
#if MICROPY_PY_UBLUEPY_OBSERVER
    // Nothing yet.
#endif
};

STATIC MP_DEFINE_CONST_DICT(ubluepy_peripheral_locals_dict, ubluepy_peripheral_locals_dict_table);

MP_DEFINE_CONST_OBJ_TYPE(
    ubluepy_peripheral_type,
    MP_QSTR_Peripheral,
    MP_TYPE_FLAG_NONE,
    make_new, ubluepy_peripheral_make_new,
    print, ubluepy_peripheral_print,
    locals_dict, &ubluepy_peripheral_locals_dict
    );

#endif // MICROPY_PY_UBLUEPY