/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 "Eric Poulsen" <eric@zyxod.com>
 * Copyright (c) 2021 "Tobias Eydam" <tobiaseydam@hotmail.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 "esp_idf_version.h"

// LAN only for ESP32 (not ESP32S2) and only for ESP-IDF v4.1 and higher
#if (ESP_IDF_VERSION_MAJOR == 4) && (ESP_IDF_VERSION_MINOR >= 1) && (CONFIG_IDF_TARGET_ESP32)

#include "esp_eth.h"
#include "esp_eth_mac.h"
#include "esp_event.h"
#include "esp_log.h"
#include "esp_netif.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;
    esp_eth_phy_t *phy;
    esp_netif_t *eth_netif;
    esp_eth_handle_t eth_handle;
} 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 uint8_t eth_status = 0;

static void eth_event_handler(void *arg, esp_event_base_t event_base,
    int32_t event_id, void *event_data) {
    switch (event_id) {
        case ETHERNET_EVENT_CONNECTED:
            eth_status = ETH_CONNECTED;
            ESP_LOGI("ethernet", "Ethernet Link Up");
            break;
        case ETHERNET_EVENT_DISCONNECTED:
            eth_status = ETH_DISCONNECTED;
            ESP_LOGI("ethernet", "Ethernet Link Down");
            break;
        case ETHERNET_EVENT_START:
            eth_status = ETH_STARTED;
            ESP_LOGI("ethernet", "Ethernet Started");
            break;
        case ETHERNET_EVENT_STOP:
            eth_status = ETH_STOPPED;
            ESP_LOGI("ethernet", "Ethernet Stopped");
            break;
        case IP_EVENT_ETH_GOT_IP:
            eth_status = ETH_GOT_IP;
            ESP_LOGI("ethernet", "Ethernet Got IP");
            break;
        default:
            break;
    }
}

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_OBJ, {.u_obj = mp_const_none} },
        { 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(MP_ERROR_TEXT("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(MP_ERROR_TEXT("invalid phy address"));
    }
    self->phy_addr = args[ARG_phy_addr].u_int;

    if (args[ARG_phy_type].u_int != PHY_LAN8720 &&
        args[ARG_phy_type].u_int != PHY_IP101 &&
        args[ARG_phy_type].u_int != PHY_RTL8201 &&
        #if ESP_IDF_VERSION_MINOR >= 3      // KSZ8041 is new in ESP-IDF v4.3
        args[ARG_phy_type].u_int != PHY_KSZ8041 &&
        #endif
        args[ARG_phy_type].u_int != PHY_DP83848) {
        mp_raise_ValueError(MP_ERROR_TEXT("invalid phy type"));
    }

    eth_mac_config_t mac_config = ETH_MAC_DEFAULT_CONFIG();
    mac_config.smi_mdc_gpio_num = self->mdc_pin;
    mac_config.smi_mdio_gpio_num = self->mdio_pin;
    esp_eth_mac_t *mac = esp_eth_mac_new_esp32(&mac_config);

    eth_phy_config_t phy_config = ETH_PHY_DEFAULT_CONFIG();
    phy_config.phy_addr = self->phy_addr;
    phy_config.reset_gpio_num = self->phy_power_pin;
    self->phy = NULL;

    switch (args[ARG_phy_type].u_int) {
        case PHY_LAN8720:
            self->phy = esp_eth_phy_new_lan8720(&phy_config);
            break;
        case PHY_IP101:
            self->phy = esp_eth_phy_new_ip101(&phy_config);
            break;
        case PHY_RTL8201:
            self->phy = esp_eth_phy_new_rtl8201(&phy_config);
            break;
        case PHY_DP83848:
            self->phy = esp_eth_phy_new_dp83848(&phy_config);
            break;
        case PHY_KSZ8041:
            #if ESP_IDF_VERSION_MINOR >= 3      // KSZ8041 is new in ESP-IDF v4.3
            self->phy = esp_eth_phy_new_ksz8041(&phy_config);
            break;
            #endif
        default:
            mp_raise_ValueError(MP_ERROR_TEXT("unknown phy"));
    }

    if (esp_netif_init() != ESP_OK) {
        mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_netif_init failed"));
    }

    esp_netif_config_t cfg = ESP_NETIF_DEFAULT_ETH();
    self->eth_netif = esp_netif_new(&cfg);

    if (esp_eth_set_default_handlers(self->eth_netif) != ESP_OK) {
        mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_eth_set_default_handlers failed (invalid parameter)"));
    }

    if (esp_event_handler_register(ETH_EVENT, ESP_EVENT_ANY_ID, &eth_event_handler, NULL) != ESP_OK) {
        mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_event_handler_register failed"));
    }

    if (esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, &eth_event_handler, NULL) != ESP_OK) {
        mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_event_handler_register failed"));
    }

    esp_eth_config_t config = ETH_DEFAULT_CONFIG(mac, self->phy);

    esp_err_t esp_err = esp_eth_driver_install(&config, &self->eth_handle);
    if (esp_err == ESP_OK) {
        self->active = false;
        self->initialized = true;
    } else {
        if (esp_err == ESP_ERR_INVALID_ARG) {
            mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_eth_driver_install failed with invalid argument"));
        } else if (esp_err == ESP_ERR_NO_MEM) {
            mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_eth_driver_install failed with no memory for driver"));
        } else {
            mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_eth_driver_install failed"));
        }
    }

    if (esp_netif_attach(self->eth_netif, esp_eth_new_netif_glue(self->eth_handle)) != ESP_OK) {
        mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("esp_netif_attach failed"));
    }

    eth_status = ETH_INITIALIZED;

    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_start(self->eth_handle) == ESP_OK);
            if (!self->active) {
                mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("ethernet enable failed"));
            }
        } else {
            self->active = !(esp_eth_stop(self->eth_handle) == ESP_OK);
            if (self->active) {
                mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("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_OBJ_NEW_SMALL_INT(eth_status);
}
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->phy->get_link(self->phy) == ETH_LINK_UP) : mp_const_false;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(lan_isconnected_obj, lan_isconnected);

STATIC mp_obj_t lan_config(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    if (n_args != 1 && kwargs->used != 0) {
        mp_raise_TypeError(MP_ERROR_TEXT("either pos or kw args are allowed"));
    }
    lan_if_obj_t *self = MP_OBJ_TO_PTR(args[0]);

    if (kwargs->used != 0) {

        for (size_t i = 0; i < kwargs->alloc; i++) {
            if (mp_map_slot_is_filled(kwargs, i)) {
                switch (mp_obj_str_get_qstr(kwargs->table[i].key)) {
                    case MP_QSTR_mac: {
                        mp_buffer_info_t bufinfo;
                        mp_get_buffer_raise(kwargs->table[i].value, &bufinfo, MP_BUFFER_READ);
                        if (bufinfo.len != 6) {
                            mp_raise_ValueError(MP_ERROR_TEXT("invalid buffer length"));
                        }
                        esp_eth_ioctl(self->eth_handle, ETH_CMD_S_MAC_ADDR, bufinfo.buf);
                        break;
                    }
                    default:
                        break;
                }
            }
        }
        return mp_const_none;
    }

    if (n_args != 2) {
        mp_raise_TypeError(MP_ERROR_TEXT("can query only one param"));
    }

    mp_obj_t val = mp_const_none;

    switch (mp_obj_str_get_qstr(args[1])) {
        case MP_QSTR_mac: {
            uint8_t mac[6];
            esp_eth_ioctl(self->eth_handle, ETH_CMD_G_MAC_ADDR, mac);
            return mp_obj_new_bytes(mac, sizeof(mac));
        }
        default:
            mp_raise_ValueError(MP_ERROR_TEXT("unknown config param"));
    }

    return val;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(lan_config_obj, 1, lan_config);

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_config), MP_ROM_PTR(&lan_config_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);

MP_DEFINE_CONST_OBJ_TYPE(
    lan_if_type,
    MP_QSTR_LAN,
    MP_TYPE_FLAG_NONE,
    locals_dict, &lan_if_locals_dict
    );

#endif