/*
 * Copyright (C) 2014 BlueKitchen GmbH
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 * modification, are permitted provided that the following conditions
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 *
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 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 */

// *****************************************************************************
//
// ANCS Client Demo
//
// TODO: query full text upon notification using control point
// TODO: present notifications in human readable form
//
// *****************************************************************************

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/uio.h>
#include <unistd.h>
#include <termios.h>

#include "btstack-config.h"

#include <btstack/run_loop.h>

#include "debug.h"
#include "btstack_memory.h"

#include "hci.h"
#include "hci_dump.h"

#include "l2cap.h"

#include "att.h"
#include "att_server.h"
#include "le_device_db.h"
#include "gap_le.h"
#include "gatt_client.h"
#include "sm.h"
#include "ancs_client_lib.h"

// ancs client profile
#include "ancs_client.h"

enum {
    SET_ADVERTISEMENT_PARAMS = 1 << 0,
    SET_ADVERTISEMENT_DATA   = 1 << 1,
    ENABLE_ADVERTISEMENTS    = 1 << 2,
};

const uint8_t adv_data[] = {
    // Flags general discoverable
    0x02, 0x01, 0x02, 
    // Name
    0x05, 0x09, 'A', 'N', 'C', 'S', 
    // Service Solicitation, 128-bit UUIDs - ANCS (little endian)
    0x11,0x15,0xD0,0x00,0x2D,0x12,0x1E,0x4B,0x0F,0xA4,0x99,0x4E,0xCE,0xB5,0x31,0xF4,0x05,0x79
};
uint8_t adv_data_len = sizeof(adv_data);

static uint16_t todos = 0;

static void app_run(){

    if (!hci_can_send_command_packet_now()) return;

    if (todos & SET_ADVERTISEMENT_DATA){
        printf("app_run: set advertisement data\n");
        todos &= ~SET_ADVERTISEMENT_DATA;
        hci_send_cmd(&hci_le_set_advertising_data, adv_data_len, adv_data);
        return;
    }    

    if (todos & SET_ADVERTISEMENT_PARAMS){
        todos &= ~SET_ADVERTISEMENT_PARAMS;
        uint8_t adv_type = 0;   // default
        bd_addr_t null_addr;
        memset(null_addr, 0, 6);
        uint16_t adv_int_min = 0x0030;
        uint16_t adv_int_max = 0x0030;
        hci_send_cmd(&hci_le_set_advertising_parameters, adv_int_min, adv_int_max, adv_type, 0, 0, &null_addr, 0x07, 0x00);
        return;
    }    

    if (todos & ENABLE_ADVERTISEMENTS){
        printf("app_run: enable advertisements\n");
        todos &= ~ENABLE_ADVERTISEMENTS;
        hci_send_cmd(&hci_le_set_advertise_enable, 1);
        return;
    }
}

static void app_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){

    ancs_client_hci_event_handler(packet_type, channel, packet, size);

    switch (packet_type) {
            
        case HCI_EVENT_PACKET:
            switch (packet[0]) {
                
                case BTSTACK_EVENT_STATE:
                    // bt stack activated, get started
                    if (packet[2] == HCI_STATE_WORKING) {
                        printf("SM Init completed\n");
                        todos = SET_ADVERTISEMENT_PARAMS | SET_ADVERTISEMENT_DATA | ENABLE_ADVERTISEMENTS;
                        app_run();
                    }
                    break;
                
                case HCI_EVENT_DISCONNECTION_COMPLETE:
                    todos = ENABLE_ADVERTISEMENTS;
                    break;
                    
                // case ATT_HANDLE_VALUE_INDICATION_COMPLETE:
                //     printf("ATT_HANDLE_VALUE_INDICATION_COMPLETE status %u\n", packet[2]);
                //     break;

                default:
                    break;
            }
    }
    app_run();
}

void ancs_callback(ancs_event_t * event){
    const char * attribute_name;
    switch (event->type){
        case ANCS_CLIENT_CONNECTED:
            printf("ANCS Client: Connected\n");
            break;
        case ANCS_CLIENT_DISCONNECTED:
            printf("ANCS Client: Disconnected\n");
            break;
        case ANCS_CLIENT_NOTIFICATION:
            attribute_name = ancs_client_attribute_name_for_id(event->attribute_id);
            if (!attribute_name) break;
            printf("Notification: %s - %s\n", attribute_name, event->text);
            break;
        default:
            break;
    }
}

int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
    
    printf("BTstack ANCS Client starting up...\n");

    // set up l2cap_le
    l2cap_init();
    
    // setup le device db
    le_device_db_init();

    // setup SM: Display only
    sm_init();
    sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY);
    sm_set_authentication_requirements( SM_AUTHREQ_BONDING ); 

    // setup ATT server
    att_server_init(profile_data, NULL, NULL);    
    att_server_register_packet_handler(app_packet_handler);

    // setup GATT client
    gatt_client_init();

    // setup ANCS Client
    ancs_client_init();
    ancs_client_register_callback(&ancs_callback);

    // turn on!
    hci_power_control(HCI_POWER_ON);
    
    return 0;
}