// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "lwip/netif.h"
#include "lwip/tcpip.h"
#include "lwip/dhcp.h"
#include "netif/etharp.h"
#include "esp_wifi.h"
#include "esp_timer.h"
#include "esp_misc.h"
#include "tcpip_adapter.h"
#include "dhcpserver/dhcpserver.h"

/* Avoid warning. No header file has include these function */
err_t ethernetif_init(struct netif* netif);
void system_station_got_ip_set();
void netif_create_ip4_linklocal_address(struct netif* netif);

static os_timer_t* get_ip_timer;
static uint8_t dhcp_fail_time;
static bool dhcps_flag = true;
static bool dhcpc_flag = true;
static struct ip_info esp_ip[TCPIP_ADAPTER_IF_MAX];

void esp_wifi_station_dhcpc_event(uint8_t netif_index)
{
    if (TCPIP_ADAPTER_IF_VALID(netif_index)) {
        TCPIP_ATAPTER_LOG("wifi station dhcpc start\n");
        dhcp_stop(esp_netif[netif_index]);
        dhcp_cleanup(esp_netif[netif_index]);
        dhcp_inform(esp_netif[netif_index]);
    } else {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
    }
}

static void tcpip_adapter_dhcpc_done()
{
#define DHCP_BOUND        10
    os_timer_disarm(get_ip_timer);

    if (esp_netif[TCPIP_ADAPTER_IF_STA]->dhcp->state == DHCP_BOUND) {
        /*send event here*/
        system_station_got_ip_set();
        printf("ip:" IPSTR ",mask:" IPSTR ",gw:" IPSTR "\n", IP2STR(&(esp_netif[0]->ip_addr)),
               IP2STR(&(esp_netif[0]->netmask)), IP2STR(&(esp_netif[0]->gw)));
    } else if (dhcp_fail_time < 30) {
        TCPIP_ATAPTER_LOG("dhcpc time(ms): %d\n", dhcp_fail_time * 200);
        dhcp_fail_time ++;
        os_timer_setfn(get_ip_timer, tcpip_adapter_dhcpc_done, NULL);
        os_timer_arm(get_ip_timer, 200, 1);
    } else {
        TCPIP_ATAPTER_LOG("ERROR dhcp get ip error\n");
        free(get_ip_timer);
    }
}

static void tcpip_adapter_station_dhcp_start()
{
    err_t ret;
    get_ip_timer = (os_timer_t*)malloc(sizeof(*get_ip_timer));

    if (get_ip_timer == NULL) {
        TCPIP_ATAPTER_LOG("ERROR NO MEMORY\n");
    }

    TCPIP_ATAPTER_LOG("dhcpc start\n");
    ret = dhcp_start(esp_netif[TCPIP_ADAPTER_IF_STA]);
    dhcp_fail_time = 0;

    if (ret == 0) {
        os_timer_disarm(get_ip_timer);
        os_timer_setfn(get_ip_timer, tcpip_adapter_dhcpc_done, NULL);
        os_timer_arm(get_ip_timer, 100, 1);
    }
}

void tcpip_adapter_start(uint8_t netif_index, bool authed)
{
    if (!TCPIP_ADAPTER_IF_VALID(netif_index)) {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return;
    }

    TCPIP_ATAPTER_LOG("start netif[%d]\n", netif_index);

    if (netif_index == TCPIP_ADAPTER_IF_STA) {
        if (authed == 0) {
            if (esp_netif[netif_index] == NULL) {
                esp_netif[netif_index] = (struct netif*)os_zalloc(sizeof(*esp_netif[netif_index]));
                TCPIP_ATAPTER_LOG("Malloc netif:%d\n", netif_index);
                TCPIP_ATAPTER_LOG("Add netif:%d\n", netif_index);
                netif_add(esp_netif[netif_index], NULL, NULL, NULL, NULL, ethernetif_init, tcpip_input);
            }
        } else {
            if ((esp_netif[netif_index]->flags & NETIF_FLAG_DHCP) == 0) {
                if (dhcpc_flag) {
                    printf("dhcp client start...\n");
                    tcpip_adapter_station_dhcp_start();
                } else {
                    if (esp_ip[TCPIP_ADAPTER_IF_STA].ip.addr != 0) {
                        netif_set_addr(esp_netif[netif_index], &esp_ip[TCPIP_ADAPTER_IF_STA].ip,
                                       &esp_ip[TCPIP_ADAPTER_IF_STA].netmask, &esp_ip[TCPIP_ADAPTER_IF_STA].gw);
                        netif_set_up(esp_netif[netif_index]);
                        system_station_got_ip_set();
                        printf("ip: 0.0.0.0,mask: 0.0.0.0,gw: 0.0.0.0\n");
                    } else {
                        printf("check your static ip\n");
                    }
                }

            }

        }
    } else if (netif_index == TCPIP_ADAPTER_IF_AP) {
        if (dhcps_flag) {
            IP4_ADDR(&esp_ip[TCPIP_ADAPTER_IF_AP].ip, 192, 168 , 4, 1);
            IP4_ADDR(&esp_ip[TCPIP_ADAPTER_IF_AP].gw, 192, 168 , 4, 1);
            IP4_ADDR(&esp_ip[TCPIP_ADAPTER_IF_AP].netmask, 255, 255 , 255, 0);
        }

        if (esp_netif[netif_index] == NULL) {
            TCPIP_ATAPTER_LOG("Malloc netif:%d\n", netif_index);
            esp_netif[netif_index] = (struct netif*)os_zalloc(sizeof(*esp_netif[netif_index]));
            netif_add(esp_netif[netif_index], &esp_ip[TCPIP_ADAPTER_IF_AP].ip,
                      &esp_ip[TCPIP_ADAPTER_IF_AP].netmask, &esp_ip[TCPIP_ADAPTER_IF_AP].gw, NULL, ethernetif_init, tcpip_input);
        }

        if (dhcps_flag) {
            dhcps_start(&esp_ip[TCPIP_ADAPTER_IF_AP]);
            printf("dhcp server start:(");
            printf("ip:" IPSTR ",mask:" IPSTR ",gw:" IPSTR, IP2STR(&(esp_netif[TCPIP_ADAPTER_IF_AP]->ip_addr)),
                   IP2STR(&(esp_netif[TCPIP_ADAPTER_IF_AP]->netmask)), IP2STR(&(esp_netif[TCPIP_ADAPTER_IF_AP]->gw)));
            printf(")\n");
        }

        netif_set_up(esp_netif[netif_index]);
        netif_set_default(esp_netif[netif_index]);
    }

    uint8_t opmode = wifi_get_opmode();

    if (opmode == STATION_MODE) {
        netif_set_default(esp_netif[netif_index]);
    }
}

void tcpip_adapter_stop(uint8_t netif_index)
{
    if (!TCPIP_ADAPTER_IF_VALID(netif_index)) {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return;
    }
    if (esp_netif[netif_index] == NULL)
        return;

    if (netif_index == TCPIP_ADAPTER_IF_STA) {
        TCPIP_ATAPTER_LOG("dhcp stop netif index:%d\n", netif_index);
        dhcp_stop(esp_netif[netif_index]);
    }

    if (netif_index == TCPIP_ADAPTER_IF_AP) {
        if(dhcps_flag){
            TCPIP_ATAPTER_LOG("dhcp stop netif index:%d\n", netif_index);
            dhcps_stop();
        }
    }

    TCPIP_ATAPTER_LOG("stop netif[%d]\n", netif_index);
    netif_remove(esp_netif[netif_index]);
    os_free(esp_netif[netif_index]);
    esp_netif[netif_index] = NULL;
}

void ieee80211_input(uint8_t netif_index, uint8_t* input, uint16_t len)
{
    struct pbuf* pb;

    if (!TCPIP_ADAPTER_IF_VALID(netif_index)) {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return;
    }

    pb = pbuf_alloc(PBUF_MAC, len, PBUF_RAM);

    if (pb == NULL) {
        TCPIP_ATAPTER_LOG("ERROR NO MEMORY\n");
        return;
    }

    memcpy((uint8_t*)(pb->payload), (uint8_t*)input, len);
    ethernet_input(pb, esp_netif[netif_index]);
}

bool wifi_set_ip_info(WIFI_INTERFACE netif_index, struct ip_info* if_ip)
{
    if (!TCPIP_ADAPTER_IF_VALID((uint8_t)netif_index)) {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return false;
    }

    TCPIP_ATAPTER_LOG("Set netif[%d] ip info\n", netif_index);
    netif_set_addr(esp_netif[netif_index], &if_ip->ip,  &if_ip->netmask, &if_ip->gw);
    return true;
}

bool wifi_get_ip_info(WIFI_INTERFACE netif_index, struct ip_info* if_ip)
{
    if (!TCPIP_ADAPTER_IF_VALID((uint8_t)netif_index)) {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return false;
    }

    TCPIP_ATAPTER_LOG("Get netif[%d] ip info\n", netif_index);
    if_ip->ip = esp_netif[netif_index]->ip_addr;
    if_ip->netmask = esp_netif[netif_index]->netmask;
    if_ip->gw = esp_netif[netif_index]->gw;
    return true;
}

bool wifi_create_linklocal_ip(uint8_t netif_index, bool ipv6)
{
    if (!TCPIP_ADAPTER_IF_VALID(netif_index)) {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return false;
    }

    netif_create_ip4_linklocal_address(esp_netif[netif_index]);
    return true;
}

bool wifi_get_linklocal_ip(uint8_t netif_index, ipX_addr_t* linklocal)
{
    if (TCPIP_ADAPTER_IF_VALID(netif_index)) {
        memcpy(linklocal, &esp_netif[netif_index]->link_local_addr, sizeof(*linklocal));
    } else {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return false;
    }

    return true;
}

bool wifi_get_ipinfo_v6(uint8_t netif_index, uint8_t ip_index, ipX_addr_t* ipv6)
{
#if LWIP_IPV6

    if (TCPIP_ADAPTER_IF_VALID(netif_index)) {
        memcpy(ipv6, &esp_netif[netif_index]->ip6_addr[ip_index], sizeof(ip6_addr_t));
    } else {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return false;
    }

#endif
    return true;
}

bool wifi_softap_dhcps_start(void)
{
    uint8_t opmode = NULL_MODE;
    TCPIP_ATAPTER_LOG("start softap dhcps\n");
    taskENTER_CRITICAL();
    opmode = wifi_get_opmode();

    if ((opmode == STATION_MODE) || (opmode == NULL_MODE)) {
        taskEXIT_CRITICAL();
        TCPIP_ATAPTER_LOG("ERROR you shoud enable wifi softap before start dhcp server\n");
        return false;
    }

    if (dhcps_flag == false) {
        struct ip_info ipinfo;
        wifi_get_ip_info(SOFTAP_IF, &ipinfo);
        TCPIP_ATAPTER_LOG("start softap dhcpserver\n");
        dhcps_start(&ipinfo);
    }

    dhcps_flag = true;
    taskEXIT_CRITICAL();
    return true;
}

enum dhcp_status wifi_softap_dhcps_status()
{
    return dhcps_flag;
}

void tcpip_adapter_sta_leave()
{
    TCPIP_ATAPTER_LOG("station leave\n");

    if (esp_netif[TCPIP_ADAPTER_IF_STA] == NULL) {
        return;
    }

    netif_set_down(esp_netif[TCPIP_ADAPTER_IF_STA]);

    if (esp_netif[TCPIP_ADAPTER_IF_STA]->flags & NETIF_FLAG_DHCP) {
        dhcp_release(esp_netif[TCPIP_ADAPTER_IF_STA]);
        dhcp_stop(esp_netif[TCPIP_ADAPTER_IF_STA]);
        dhcp_cleanup(esp_netif[TCPIP_ADAPTER_IF_STA]);
    }

    ip_addr_set_zero(&esp_netif[TCPIP_ADAPTER_IF_STA]->ip_addr);
    ip_addr_set_zero(&esp_netif[TCPIP_ADAPTER_IF_STA]->netmask);
    ip_addr_set_zero(&esp_netif[TCPIP_ADAPTER_IF_STA]->gw);
}

bool wifi_softap_dhcps_stop()
{
    uint8_t opmode = NULL_MODE;
    taskENTER_CRITICAL();
    opmode = wifi_get_opmode();

    if ((opmode == STATION_MODE) || (opmode == NULL_MODE)) {
        taskEXIT_CRITICAL();
        TCPIP_ATAPTER_LOG("ERROR you shoud enable wifi softap before start dhcp server\n");
        return false;
    }

    if (dhcps_flag == true) {
        TCPIP_ATAPTER_LOG("dhcps stop\n");
        dhcps_stop();
    }

    dhcps_flag = false;
    taskEXIT_CRITICAL();
    return true;

}

bool wifi_station_dhcpc_start()
{
    uint8_t opmode = NULL_MODE;
    s8 ret;
    taskENTER_CRITICAL();
    opmode = wifi_get_opmode();

    if ((opmode == SOFTAP_MODE) || (opmode == NULL_MODE)) {
        taskEXIT_CRITICAL();
        TCPIP_ATAPTER_LOG("ERROR you shoud enable wifi station mode before start dhcp client\n");
        return false;
    }

    if (dhcpc_flag == false) {
        if (netif_is_up(esp_netif[TCPIP_ADAPTER_IF_STA])) {
            ip_addr_set_zero(&esp_netif[TCPIP_ADAPTER_IF_STA]->ip_addr);
            ip_addr_set_zero(&esp_netif[TCPIP_ADAPTER_IF_STA]->netmask);
            ip_addr_set_zero(&esp_netif[TCPIP_ADAPTER_IF_STA]->gw);
        } else {
            taskEXIT_CRITICAL();
            TCPIP_ATAPTER_LOG("ERROR please init station netif\n");
            return false;
        }

        ret = dhcp_start(esp_netif[TCPIP_ADAPTER_IF_STA]);

        if (ret != ERR_OK) {
            taskEXIT_CRITICAL();
            TCPIP_ATAPTER_LOG("ERROR start dhcp client failed.ret=%d\n", ret);
            return false;
        }
    }

    dhcps_flag = true;
    taskEXIT_CRITICAL();
    TCPIP_ATAPTER_LOG("dhcp client start\n");
    return true;
}

bool wifi_station_dhcpc_stop()
{
    uint8_t opmode = NULL_MODE;
    taskENTER_CRITICAL();
    opmode = wifi_get_opmode();

    if ((opmode == SOFTAP_MODE) || (opmode == NULL_MODE)) {
        taskEXIT_CRITICAL();
        TCPIP_ATAPTER_LOG("ERROR you shoud enable wifi station mode before stop dhcp client\n");
        return false;
    }

    if (dhcpc_flag == true) {
        dhcp_stop(esp_netif[TCPIP_ADAPTER_IF_STA]);
    } else {
        TCPIP_ATAPTER_LOG("WARING dhcp client have not start yet\n");
    }

    dhcpc_flag = false;
    taskEXIT_CRITICAL();
    TCPIP_ATAPTER_LOG("stop dhcp client\n");
    return true;
}

enum dhcp_status wifi_station_dhcpc_status()
{
    return dhcpc_flag;
}

bool wifi_station_dhcpc_set_maxtry(uint8_t num)
{
    DHCP_MAXRTX = num;
    return true;
}

bool tcpip_adapter_set_macaddr(uint8_t netif_index, uint8_t* macaddr)
{
    if (esp_netif[netif_index] == NULL || macaddr == NULL) {
        TCPIP_ATAPTER_LOG("set macaddr fail\n");
        return false;
    }

    memcpy(esp_netif[netif_index]->hwaddr, macaddr, 6);
    TCPIP_ATAPTER_LOG("set macaddr ok\n");
    return true;
}

bool tcpip_adapter_get_macaddr(uint8_t netif_index, uint8_t* macaddr)
{
    if (esp_netif[netif_index] == NULL || macaddr == NULL) {
        return false;
    }

    if (esp_netif[netif_index]->hwaddr[0] == 0 && esp_netif[netif_index]->hwaddr[1] == 0
            && esp_netif[netif_index]->hwaddr[2] == 0 && esp_netif[netif_index]->hwaddr[3] == 0
            && esp_netif[netif_index]->hwaddr[4] == 0 && esp_netif[netif_index]->hwaddr[5] == 0)
    return false;
    
    memcpy(macaddr, esp_netif[netif_index]->hwaddr, 6);
    return true;
}


bool wifi_station_set_hostname(char* name)
{
    if (name == NULL) {
        return false;
    }

    uint32 len = strlen(name);

    if (len > 32) {
        return false;
    }

    uint8_t opmode = wifi_get_opmode();

    if (opmode == STATION_MODE || opmode == STATIONAP_MODE) {
        default_hostname = 0;

        if (hostname != NULL) {
            free(hostname);
            hostname = NULL;
        }

        hostname = (char*)malloc(len + 1);

        if (hostname != NULL) {
            strcpy(hostname, name);
            esp_netif[opmode - 1]->hostname = hostname;
        } else {
            return false;
        }
    } else {
        return false;
    }

    return true;
}

struct netif* eagle_lwip_getif(uint8_t netif_index)
{
    if (TCPIP_ADAPTER_IF_VALID(netif_index)) {
        return esp_netif[netif_index];
    } else {
        TCPIP_ATAPTER_LOG("ERROR bad netif index:%d\n", netif_index);
        return NULL;
    }
}