/*
 * Copyright (C) 2014 BlueKitchen GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    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
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Please inquire about commercial licensing options at 
 * contact@bluekitchen-gmbh.com
 *
 */

#define BTSTACK_FILE__ "main.c"

// *****************************************************************************
//
// minimal setup for HCI code
//
// *****************************************************************************

#include <getopt.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <hci_dump_posix_stdout.h>

#include <btstack_config.h>

#include "ble/le_device_db_tlv.h"
#include "bluetooth_company_id.h"
#include "btstack_audio.h"
#include "btstack_chipset_realtek.h"
#include "btstack_chipset_zephyr.h"
#include "btstack_debug.h"
#include "btstack_event.h"
#include "btstack_memory.h"
#include "btstack_run_loop.h"
#include "btstack_run_loop_posix.h"
#include "btstack_signal.h"
#include "btstack_stdin.h"
#include "btstack_tlv_posix.h"
#include "classic/btstack_link_key_db_tlv.h"
#include "hal_led.h"
#include "hci.h"
#include "hci_dump.h"
#include "hci_dump_posix_fs.h"
#include "hci_transport.h"
#include "hci_transport_usb.h"

#define USB_VENDOR_ID_REALTEK 0x0bda

#define TLV_DB_PATH_PREFIX "/tmp/btstack_"
#define TLV_DB_PATH_POSTFIX ".tlv"
static char tlv_db_path[100];
static bool tlv_reset;
static const btstack_tlv_t * tlv_impl;
static btstack_tlv_posix_t   tlv_context;
static bd_addr_t             local_addr;

int btstack_main(int argc, const char * argv[]);

static bd_addr_t static_address;
static int using_static_address;

static btstack_packet_callback_registration_t hci_event_callback_registration;

// shutdown
static bool shutdown_triggered;

static void local_version_information_handler(uint8_t * packet){
    printf("Local version information:\n");
    uint16_t hci_version    = packet[6];
    uint16_t hci_revision   = little_endian_read_16(packet, 7);
    uint16_t lmp_version    = packet[9];
    uint16_t manufacturer   = little_endian_read_16(packet, 10);
    uint16_t lmp_subversion = little_endian_read_16(packet, 12);
    printf("- HCI Version    0x%04x\n", hci_version);
    printf("- HCI Revision   0x%04x\n", hci_revision);
    printf("- LMP Version    0x%04x\n", lmp_version);
    printf("- LMP Subversion 0x%04x\n", lmp_subversion);
    printf("- Manufacturer   0x%04x\n", manufacturer);
    switch (manufacturer){
        case BLUETOOTH_COMPANY_ID_THE_LINUX_FOUNDATION:
            printf("- Linux Foundation - assume Zephyr hci_usb firmware running on nRF52xx\n");
            // setup Zephyr chipset support
            hci_set_chipset(btstack_chipset_zephyr_instance());
            // sm required to setup static random Bluetooth address
            sm_init();
            break;
        default:
            break;
    }
}

static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    UNUSED(channel);
    UNUSED(size);
    uint8_t i;
    uint8_t usb_path_len;
    const uint8_t * usb_path;
    uint16_t product_id;
    uint16_t vendor_id;
    const uint8_t * params;

    if (packet_type != HCI_EVENT_PACKET) return;

    switch (hci_event_packet_get_type(packet)){
        case HCI_EVENT_TRANSPORT_USB_INFO:
            usb_path_len = hci_event_transport_usb_info_get_path_len(packet);
            usb_path = hci_event_transport_usb_info_get_path(packet);
            // print device path
            product_id = hci_event_transport_usb_info_get_product_id(packet);
            vendor_id = hci_event_transport_usb_info_get_vendor_id(packet);
            printf("USB device 0x%04x/0x%04x, path: %u:",
                vendor_id, product_id, hci_event_transport_usb_info_get_bus(packet));
            for (i=0;i<usb_path_len;i++){
                if (i) printf(".");
                printf("%u", usb_path[i]);
            }
            printf("\n");

            // set Product ID for Realtek Controllers and use Realtek-specific stack startup
            if (vendor_id == USB_VENDOR_ID_REALTEK) {
                printf("Realtek Controller - requires firmware and config download\n");
                btstack_chipset_realtek_set_product_id(product_id);
                hci_set_chipset(btstack_chipset_realtek_instance());
                hci_enable_custom_pre_init();
            }
            break;
        case BTSTACK_EVENT_STATE:
            switch (btstack_event_state_get_state(packet)){
                case HCI_STATE_WORKING:
                    gap_local_bd_addr(local_addr);
                    if (using_static_address){
                        memcpy(local_addr, static_address, 6);
                    }
                    btstack_strcpy(tlv_db_path, sizeof(tlv_db_path), TLV_DB_PATH_PREFIX);
                    btstack_strcat(tlv_db_path, sizeof(tlv_db_path), bd_addr_to_str_with_delimiter(local_addr, '-'));
                    btstack_strcat(tlv_db_path, sizeof(tlv_db_path), TLV_DB_PATH_POSTFIX);
                    printf("TLV path: %s", tlv_db_path);
                    if (tlv_reset){
                        int rc = unlink(tlv_db_path);
                        if (rc == 0) {
                            printf(", reset ok");
                        } else {
                            printf(", reset failed with result = %d", rc);
                        }
                    }
                    printf("\n");
                    tlv_impl = btstack_tlv_posix_init_instance(&tlv_context, tlv_db_path);
                    btstack_tlv_set_instance(tlv_impl, &tlv_context);
#ifdef ENABLE_CLASSIC
                    hci_set_link_key_db(btstack_link_key_db_tlv_get_instance(tlv_impl, &tlv_context));
#endif
#ifdef ENABLE_BLE
                    le_device_db_tlv_configure(tlv_impl, &tlv_context);
#endif
                    printf("BTstack up and running on %s.\n", bd_addr_to_str(local_addr));
                    break;
                case HCI_STATE_OFF:
                    btstack_tlv_posix_deinit(&tlv_context);
                    if (!shutdown_triggered) break;
                    // reset stdin
                    btstack_stdin_reset();
                    log_info("Good bye, see you.\n");
                    exit(0);
                    break;
                default:
                    break;
            }
            break;
        case HCI_EVENT_COMMAND_COMPLETE:
            switch (hci_event_command_complete_get_command_opcode(packet)){
                case HCI_OPCODE_HCI_READ_LOCAL_VERSION_INFORMATION:
                    local_version_information_handler(packet);
                    break;
                case HCI_OPCODE_HCI_ZEPHYR_READ_STATIC_ADDRESS:
                    params = hci_event_command_complete_get_return_parameters(packet);
                    if(params[0] != 0)
                        break;
                    if(size < 13)
                        break;
                    reverse_48(&params[2], static_address);
                    gap_random_address_set(static_address);
                    using_static_address = 1;
                    break;
                default:
                    break;
            }
            break;
        default:
            break;
    }
}

static void trigger_shutdown(void){
    printf("CTRL-C - SIGINT received, shutting down..\n");
    log_info("sigint_handler: shutting down");
    shutdown_triggered = true;
    hci_power_control(HCI_POWER_OFF);
}

static int led_state = 0;

void hal_led_toggle(void){
    led_state = 1 - led_state;
    printf("LED State %u\n", led_state);
}

static char short_options[] = "hu:l:r:b:";

static struct option long_options[] = {
    {"help",        no_argument,        NULL,   'h'},
    {"logfile",    required_argument,  NULL,   'l'},
    {"reset-tlv",    no_argument,       NULL,   'r'},
    {"usbpath",    required_argument,  NULL,   'u'},
    {0, 0, 0, 0}
};

static char *help_options[] = {
    "print (this) help.",
    "set file to store debug output and HCI trace.",
    "reset bonding information stored in TLV.",
    "set USB path, format BUS:PORT-PORT-PORT, e.g. 1:1.2.3 of Bluetooth Controller.",
};

static char *option_arg_name[] = {
    "",
    "LOGFILE",
    "",
    "USBPATH",
};

static void usage(const char *name){
    unsigned int i;
    printf( "usage:\n\t%s [options]\n", name );
    printf("valid options:\n");
    for( i=0; long_options[i].name != 0; i++) {
        printf("--%-10s| -%c  %-10s\t\t%s\n", long_options[i].name, long_options[i].val, option_arg_name[i], help_options[i] );
    }
}

#define USB_MAX_PATH_LEN 7
int main(int argc, const char * argv[]){

    uint8_t usb_path[USB_MAX_PATH_LEN];
    uint8_t usb_bus = 0;
    int usb_path_len = 0;
    const char * usb_path_string = NULL;
    const char * log_file_path = NULL;

    // parse command line parameters
    while(true){
        int c = getopt_long(argc, (char* const*)argv, short_options, long_options, NULL);
        if (c < 0) {
            break;
        }
        if (c == '?'){
            break;
        }
        switch (c) {
            case 'u':
                usb_path_string = optarg;
                break;
            case 'l':
                log_file_path = optarg;
                break;
            case 'r':
                tlv_reset = true;
                break;
            case 'h':
            default:
                usage(argv[0]);
                return EXIT_FAILURE;
        }
    }

    if (usb_path_string != NULL){
        // parse command line options for "-u 1:1-2-3"
        printf("Specified USB ");
        bool have_bus = false;
        while (1){
            char * delimiter;
            int number = (int) strtol(usb_path_string, &delimiter, 16);
            if (have_bus == false && *delimiter == ':') {
                usb_bus = number;
                have_bus = true;
                printf("Bus %u and ", usb_bus);
                usb_path_string = delimiter+1;
                continue;
            }
            if (usb_path_len == 0) {
                printf("Path ");
            }
            usb_path[usb_path_len] = number;
            usb_path_len++;
            printf("%u ", number);
            if (!delimiter) break;
            if ((*delimiter != '-') && (*delimiter != '.')) break;
            usb_path_string = delimiter+1;
        }
        printf("\n");
    }

	/// GET STARTED with BTstack ///
	btstack_memory_init();
    btstack_run_loop_init(btstack_run_loop_posix_get_instance());
	    
    if (usb_path_len){
        // Note: if usb_bus was not set, has the same effect as calling 
        // hci_transport_usb_set_bus.
        hci_transport_usb_set_bus_and_path(usb_bus, usb_path_len, usb_path);
    }

    // log into file using HCI_DUMP_PACKETLOGGER format
    char pklg_path[100];
    if (log_file_path == NULL){
        btstack_strcpy(pklg_path, sizeof(pklg_path),  "/tmp/hci_dump");
        if (usb_path_len){
            btstack_strcat(pklg_path, sizeof(pklg_path),  "_");
            btstack_strcat(pklg_path, sizeof(pklg_path),  usb_path_string);
        }
        btstack_strcat(pklg_path, sizeof(pklg_path), ".pklg");
        log_file_path = pklg_path;
    }

    hci_dump_posix_fs_open(log_file_path, HCI_DUMP_PACKETLOGGER);
    const hci_dump_t * hci_dump_impl = hci_dump_posix_fs_get_instance();
    hci_dump_init(hci_dump_impl);
    printf("Packet Log: %s\n", log_file_path);

    // init HCI
	hci_init(hci_transport_usb_instance(), NULL);

#ifdef HAVE_PORTAUDIO
    btstack_audio_sink_set_instance(btstack_audio_portaudio_sink_get_instance());
    btstack_audio_source_set_instance(btstack_audio_portaudio_source_get_instance());
#endif

    // inform about BTstack state
    hci_event_callback_registration.callback = &packet_handler;
    hci_add_event_handler(&hci_event_callback_registration);

    // register callback for CTRL-c
    btstack_signal_register_callback(SIGINT, &trigger_shutdown);

    // register known Realtek USB Controllers
    uint16_t realtek_num_controllers = btstack_chipset_realtek_get_num_usb_controllers();
    uint16_t i;
    for (i=0;i<realtek_num_controllers;i++){
        uint16_t vendor_id;
        uint16_t product_id;
        btstack_chipset_realtek_get_vendor_product_id(i, &vendor_id, &product_id);
        hci_transport_usb_add_device(vendor_id, product_id);
    }

    // setup app
    btstack_main(argc, argv);

    // go
    btstack_run_loop_execute();    

    return 0;
}
