// Copyright 2015-2016 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.
#ifndef __DHCPS_H__
#define __DHCPS_H__

#include "lwip/ip_addr.h"
//#include "esp_common.h"
#define USE_DNS

typedef struct dhcps_state{
        s16_t state;
} dhcps_state;

typedef struct dhcps_msg {
        u8_t op, htype, hlen, hops;
        u8_t xid[4];
        u16_t secs, flags;
        u8_t ciaddr[4];
        u8_t yiaddr[4];
        u8_t siaddr[4];
        u8_t giaddr[4];
        u8_t chaddr[16];
        u8_t sname[64];
        u8_t file[128];
        u8_t options[312];
}dhcps_msg;

/** DHCP OPTIONS CODE **/
typedef enum
{
    /* RFC 1497 Vendor Extensions */

    PAD = 0,
    END = 255,

    SUBNET_MASK = 1,
    TIME_OFFSET = 2,
    ROUTER = 3,
    TIME_SERVER = 4,
    NAME_SERVER = 5,
    DOMAIN_NAME_SERVER = 6,
    LOG_SERVER = 7,
    COOKIE_SERVER = 8,
    LPR_SERVER = 9,
    IMPRESS_SERVER = 10,
    RESOURCE_LOCATION_SERVER = 11,
    HOST_NAME = 12,
    BOOT_FILE_SIZE = 13,
    MERIT_DUMP_FILE = 14,
    DOMAIN_NAME = 15,
    SWAP_SERVER = 16,
    ROOT_PATH = 17,
    EXTENSIONS_PATH = 18,

    /* IP Layer Parameters per Host */

    IP_FORWARDING = 19,
    NON_LOCAL_SOURCE_ROUTING = 20,
    POLICY_FILTER = 21,
    MAXIMUM_DATAGRAM_REASSEMBLY_SIZE = 22,
    DEFAULT_IP_TIME_TO_LIVE = 23,
    PATH_MTU_AGING_TIMEOUT = 24,
    PATH_MTU_PLATEAU_TABLE = 25,

    /* IP Layer Parameters per Interface */

    INTERFACE_MTU = 26,
    ALL_SUBNETS_ARE_LOCAL = 27,
    BROADCAST_ADDRESS = 28,
    PERFORM_MASK_DISCOVERY = 29,
    MASK_SUPPLIER = 30,
    PERFORM_ROUTER_DISCOVERY = 31,
    ROUTER_SOLICITATION_ADDRESS = 32,
    STATIC_ROUTE = 33,

    /* Link Layer Parameters per Interface */

    TRAILER_ENCAPSULATION = 34,
    ARP_CACHE_TIMEOUT = 35,
    ETHERNET_ENCAPSULATION = 36,

    /* TCP Parameters */

    TCP_DEFAULT_TTL = 37,
    TCP_KEEPALIVE_INTERVAL = 38,
    TCP_KEEPALIVE_GARBAGE = 39,

    /* Application and Service Parameters */

    NETWORK_INFORMATION_SERVICE_DOMAIN = 40,
    NETWORK_INFORMATION_SERVERS = 41,
    NETWORK_TIME_PROTOCOL_SERVERS = 42,
    VENDOR_SPECIFIC_INFORMATION = 43,
    NETBIOS_OVER_TCP_IP_NAME_SERVER = 44,
    NETBIOS_OVER_TCP_IP_DATAGRAM_DISTRIBUTION_SERVER = 45,
    NETBIOS_OVER_TCP_IP_NODE_TYPE = 46,
    NETBIOS_OVER_TCP_IP_SCOPE = 47,
    X_WINDOW_SYSTEM_FONT_SERVER = 48,
    X_WINDOW_SYSTEM_DISPLAY_MANAGER = 49,
    NETWORK_INFORMATION_SERVICE_PLUS_DOMAIN = 64,
    NETWORK_INFORMATION_SERVICE_PLUS_SERVERS = 65,
    MOBILE_IP_HOME_AGENT = 68,
    SMTP_SERVER = 69,
    POP3_SERVER = 70,
    NNTP_SERVER = 71,
    DEFAULT_WWW_SERVER = 72,
    DEFAULT_FINGER_SERVER = 73,
    DEFAULT_IRC_SERVER = 74,
    STREETTALK_SERVER = 75,
    STREETTALK_DIRECTORY_ASSISTANCE_SERVER = 76,

    /* DHCP Extensions */

    REQUESTED_IP_ADDRESS = 50,
    IP_ADDRESS_LEASE_TIME = 51,
    OPTION_OVERLOAD = 52,
    TFTP_SERVER_NAME = 66,
    BOOTFILE_NAME = 67,
    DHCP_MESSAGE_TYPE = 53,
    SERVER_IDENTIFIER = 54,
    PARAMETER_REQUEST_LIST = 55,
    MESSAGE = 56,
    MAXIMUM_DHCP_MESSAGE_SIZE = 57,
    RENEWAL_T1_TIME_VALUE = 58,
    REBINDING_T2_TIME_VALUE = 59,
    VENDOR_CLASS_IDENTIFIER = 60,
    CLIENT_IDENTIFIER = 61,

    USER_CLASS = 77,
    FQDN = 81,
    DHCP_AGENT_OPTIONS = 82,
    NDS_SERVERS = 85,
    NDS_TREE_NAME = 86,
    NDS_CONTEXT = 87,
    CLIENT_LAST_TRANSACTION_TIME = 91,
    ASSOCIATED_IP = 92,
    USER_AUTHENTICATION_PROTOCOL = 98,
    AUTO_CONFIGURE = 116,
    NAME_SERVICE_SEARCH = 117,
    SUBNET_SELECTION = 118,
    DOMAIN_SEARCH = 119,
    CLASSLESS_ROUTE = 121,
} dhcp_msg_option;

/*   Defined in esp_misc.h */
typedef struct {
	bool enable;
	ip4_addr_t start_ip;
	ip4_addr_t end_ip;
} dhcps_lease_t;

enum dhcps_offer_option{
	OFFER_START = 0x00,
	OFFER_ROUTER = 0x01,
	OFFER_END
};

#define DHCPS_MAX_LEASE 0x64
#define DHCPS_LEASE_TIME_DEF	(120)

struct dhcps_pool{
	ip4_addr_t ip;
	u8_t mac[6];
	u32_t lease_timer;
};

typedef struct _list_node{
	void *pnode;
	struct _list_node *pnext;
}list_node;

typedef u32_t dhcps_time_t;
typedef u8_t dhcps_offer_t;

typedef struct {
	dhcps_offer_t dhcps_offer;
	dhcps_time_t  dhcps_time;
	dhcps_lease_t dhcps_poll;
} dhcps_options_t;

#define dhcps_router_enabled(offer) ((offer & OFFER_ROUTER) != 0)

void dhcps_start(struct netif *netif, ip4_addr_t ip);
void dhcps_stop(struct netif *netif);
void *dhcps_option_info(u8_t op_id, u32_t opt_len);
bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip);

#endif