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/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 "Eric Poulsen" <eric@zyxod.com>
 *
 * Based on the ESP IDF example code which is Public Domain / CC0
 *
 * 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 "py/runtime.h"
#include "py/mphal.h"

#include "eth_phy/phy.h"
#include "eth_phy/phy_tlk110.h"
#include "eth_phy/phy_lan8720.h"
#include "tcpip_adapter.h"

#include "modnetwork.h"

typedef struct _lan_if_obj_t {
    mp_obj_base_t base;
    int if_id; // MUST BE FIRST to match wlan_if_obj_t
    bool initialized;
    bool active;
    uint8_t mdc_pin;
    uint8_t mdio_pin;
    int8_t phy_power_pin;
    uint8_t phy_addr;
    uint8_t phy_type;
    eth_phy_check_link_func link_func;
    eth_phy_power_enable_func power_func;
} lan_if_obj_t;

const mp_obj_type_t lan_if_type;
STATIC lan_if_obj_t lan_obj = {{&lan_if_type}, ESP_IF_ETH, false, false};

STATIC void phy_power_enable(bool enable) {
    lan_if_obj_t* self = &lan_obj;

    if (self->phy_power_pin != -1) {

        if (!enable) {
            // Do the PHY-specific power_enable(false) function before powering down
            self->power_func(false);
        }

        gpio_pad_select_gpio(self->phy_power_pin);
        gpio_set_direction(self->phy_power_pin, GPIO_MODE_OUTPUT);
        if (enable) {
            gpio_set_level(self->phy_power_pin, 1);
        } else {
            gpio_set_level(self->phy_power_pin, 0);
        }

        // Allow the power up/down to take effect, min 300us
        vTaskDelay(1);

        if (enable) {
            // Run the PHY-specific power on operations now the PHY has power
            self->power_func(true);
        }
    }
}

STATIC void init_lan_rmii() {
    lan_if_obj_t* self = &lan_obj;
    phy_rmii_configure_data_interface_pins();
    phy_rmii_smi_configure_pins(self->mdc_pin, self->mdio_pin);
}

STATIC mp_obj_t get_lan(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    lan_if_obj_t* self = &lan_obj;

    if (self->initialized) {
        return MP_OBJ_FROM_PTR(&lan_obj);
    }

    enum { ARG_id, ARG_mdc, ARG_mdio, ARG_power, ARG_phy_addr, ARG_phy_type };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_id,           MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { MP_QSTR_mdc,          MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ },
        { MP_QSTR_mdio,         MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ },
        { MP_QSTR_power,        MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ },
        { MP_QSTR_phy_addr,     MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT },
        { MP_QSTR_phy_type,     MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT },
    };

    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    if (args[ARG_id].u_obj != mp_const_none) {
        if (mp_obj_get_int(args[ARG_id].u_obj) != 0) {
            mp_raise_ValueError("invalid LAN interface identifier");
        }
    }

    self->mdc_pin = machine_pin_get_id(args[ARG_mdc].u_obj);
    self->mdio_pin = machine_pin_get_id(args[ARG_mdio].u_obj);
    self->phy_power_pin = args[ARG_power].u_obj == mp_const_none ? -1 : machine_pin_get_id(args[ARG_power].u_obj);

    if (args[ARG_phy_addr].u_int < 0x00 || args[ARG_phy_addr].u_int > 0x1f) {
        mp_raise_ValueError("invalid phy address");
    }

    if (args[ARG_phy_type].u_int != PHY_LAN8720 && args[ARG_phy_type].u_int != PHY_TLK110) {
        mp_raise_ValueError("invalid phy type");
    }

    eth_config_t config;

    switch (args[ARG_phy_type].u_int) {
        case PHY_TLK110:
            config = phy_tlk110_default_ethernet_config;
            break;
        case PHY_LAN8720:
            config = phy_lan8720_default_ethernet_config;
            break;
    }

    self->link_func = config.phy_check_link;

    // Replace default power func with our own
    self->power_func = config.phy_power_enable;
    config.phy_power_enable = phy_power_enable;

    config.phy_addr = args[ARG_phy_addr].u_int;
    config.gpio_config = init_lan_rmii;
    config.tcpip_input = tcpip_adapter_eth_input;

    if (esp_eth_init(&config) == ESP_OK) {
        self->active = false;
        self->initialized = true;
    } else {
        mp_raise_msg(&mp_type_OSError, "esp_eth_init() failed");
    }
    return MP_OBJ_FROM_PTR(&lan_obj);
}
MP_DEFINE_CONST_FUN_OBJ_KW(get_lan_obj, 0, get_lan);

STATIC mp_obj_t lan_active(size_t n_args, const mp_obj_t *args) {
    lan_if_obj_t *self = MP_OBJ_TO_PTR(args[0]);

    if (n_args > 1) {
        if (mp_obj_is_true(args[1])) {
            self->active = (esp_eth_enable() == ESP_OK);
            if (!self->active) {
                mp_raise_msg(&mp_type_OSError, "ethernet enable failed");
            }
        } else {
            self->active = !(esp_eth_disable() == ESP_OK);
            if (self->active) {
                mp_raise_msg(&mp_type_OSError, "ethernet disable failed");
            }
        }
    }
    return mp_obj_new_bool(self->active);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(lan_active_obj, 1, 2, lan_active);

STATIC mp_obj_t lan_status(mp_obj_t self_in) {
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(lan_status_obj, lan_status);

STATIC mp_obj_t lan_isconnected(mp_obj_t self_in) {
    lan_if_obj_t *self = MP_OBJ_TO_PTR(self_in);
    return self->active ? mp_obj_new_bool(self->link_func()) : mp_const_false;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(lan_isconnected_obj, lan_isconnected);

STATIC const mp_rom_map_elem_t lan_if_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_active), MP_ROM_PTR(&lan_active_obj) },
    { MP_ROM_QSTR(MP_QSTR_isconnected), MP_ROM_PTR(&lan_isconnected_obj) },
    { MP_ROM_QSTR(MP_QSTR_status), MP_ROM_PTR(&lan_status_obj) },
    { MP_ROM_QSTR(MP_QSTR_ifconfig), MP_ROM_PTR(&esp_ifconfig_obj) },
};

STATIC MP_DEFINE_CONST_DICT(lan_if_locals_dict, lan_if_locals_dict_table);

const mp_obj_type_t lan_if_type = {
    { &mp_type_type },
    .name = MP_QSTR_LAN,
    .locals_dict = (mp_obj_dict_t*)&lan_if_locals_dict,
};