/*
 * Copyright (C) 2009-2012 by Matthias Ringwald
 *
 * 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 MATTHIAS RINGWALD 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 MATTHIAS
 * RINGWALD 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
 *
 */

/*
 *  bt_control_bcm.c
 *
 *  Adapter to use Broadcom-based chipsets with BTstack
 */


#include "btstack_config.h"

#include <stddef.h>   /* NULL */
#include <stdio.h> 
#include <string.h>   /* memcpy */

#include "btstack_control.h"
#include "btstack_debug.h"
#include "btstack_chipset_bcm.h"

#ifdef HAVE_POSIX_FILE_IO
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#endif

#ifdef _WIN32
#include <Windows.h>
#endif

static int send_download_command;
static uint32_t init_script_offset;

// Embedded == non posix systems

// actual init script provided by separate bt_firmware_image.c from WICED SDK
extern const uint8_t brcm_patchram_buf[];
extern const int     brcm_patch_ram_length;
extern const char    brcm_patch_version[];

//
// @note: Broadcom chips require higher UART clock for baud rate > 3000000 -> limit baud rate in hci.c
static void chipset_set_baudrate_command(uint32_t baudrate, uint8_t *hci_cmd_buffer){
    hci_cmd_buffer[0] = 0x18;
    hci_cmd_buffer[1] = 0xfc;
    hci_cmd_buffer[2] = 0x06;
    hci_cmd_buffer[3] = 0x00;
    hci_cmd_buffer[4] = 0x00;
    little_endian_store_32(hci_cmd_buffer, 5, baudrate);
}

// @note: bd addr has to be set after sending init script (it might just get re-set)
static void chipset_set_bd_addr_command(bd_addr_t addr, uint8_t *hci_cmd_buffer){
    hci_cmd_buffer[0] = 0x01;
    hci_cmd_buffer[1] = 0xfc;
    hci_cmd_buffer[2] = 0x06;
    reverse_bd_addr(addr, &hci_cmd_buffer[3]);
}

#ifdef HAVE_POSIX_FILE_IO

static const char * hcd_file_path;
static const char * hcd_folder_path = ".";
static int hcd_fd;
static char matched_file[1000];


static void chipset_init(const void * config){
    if (hcd_file_path){
        log_info("chipset-bcm: init file %s", hcd_file_path);
    } else {
        log_info("chipset-bcm: init folder %s", hcd_folder_path);
    }
    send_download_command = 1;
    init_script_offset = 0;
    hcd_fd = -1;
}

static const uint8_t download_command[] = {0x2e, 0xfc, 0x00};

static btstack_chipset_result_t chipset_next_command(uint8_t * hci_cmd_buffer){
    if (hcd_fd < 0){
        log_info("chipset-bcm: open file %s", hcd_file_path);
        hcd_fd = open(hcd_file_path, O_RDONLY);
        if (hcd_fd < 0){
            log_error("chipset-bcm: can't open file %s", hcd_file_path);
            return BTSTACK_CHIPSET_DONE;
        }
    }

    // send download firmware command
    if (send_download_command){
        send_download_command = 0;
        memcpy(hci_cmd_buffer, download_command, sizeof(download_command));
        return BTSTACK_CHIPSET_VALID_COMMAND;
    }

    // read next command, but skip download command
    do {
        // read command
        int res = read(hcd_fd, hci_cmd_buffer, 3);
        if (res == 0){
            log_info("chipset-bcm: end of file, size %u", init_script_offset);
            close(hcd_fd);

            // wait for firmware patch to be applied - shorter delay possible
#ifdef _WIN32
            Sleep(1000);
#else
            sleep(1);
#endif
            return BTSTACK_CHIPSET_DONE;
        }
        if (res < 0){
            log_error("chipset-bcm: read error at %u", init_script_offset);
            return BTSTACK_CHIPSET_DONE;
        }
        init_script_offset += 3;

        // read parameters
        int param_len = hci_cmd_buffer[2];
        if (param_len){
            res = read(hcd_fd, &hci_cmd_buffer[3], param_len);
        }
        if (res < 0){
            log_error("chipset-bcm: read error at %u", init_script_offset);
            return BTSTACK_CHIPSET_DONE;
        }
        init_script_offset += param_len;

    } while (memcmp(hci_cmd_buffer, download_command, sizeof(download_command)) == 1);
    return BTSTACK_CHIPSET_VALID_COMMAND;
}

void btstack_chipset_bcm_set_hcd_file_path(const char * path){
    hcd_file_path = path;
}

void btstack_chipset_bcm_set_hcd_folder_path(const char * path){
    hcd_folder_path = path;
}

static int equal_ignore_case(const char *str1, const char *str2){
    if (!str1 || !str2) return (1);
    int i = 0;
    while (1){
        if (!str1[i] && !str2[i]) return 1;
        if (tolower(str1[i]) != tolower(str2[i])) return 0;
        if (!str1[i] || !str2[i]) return 0;
        i++;
    }
}

// assumption starts with BCM or bcm
#define MAX_DEVICE_NAME_LEN 15
void btstack_chipset_bcm_set_device_name(const char * device_name){
    // ignore if file path already set
    if (hcd_file_path) {
        log_error("chipset-bcm: set device name called %s although path %s already set", device_name, hcd_file_path);
        return;
    } 
    // construct filename for long variant
    if (strlen(device_name) > MAX_DEVICE_NAME_LEN){
        log_error("chipset-bcm: device name %s too long", device_name);
        return;
    }
    char filename_complete[MAX_DEVICE_NAME_LEN+5];
    strcpy(filename_complete, device_name);
    strcat(filename_complete, ".hcd");

    // construct short variant without revision info
    char filename_short[MAX_DEVICE_NAME_LEN+5];
    strcpy(filename_short, device_name);
    int len = strlen(filename_short);
    while (len > 3){
        char c = filename_short[len-1];
        if (isdigit(c) == 0) break;
        len--;
    }    
    if (len > 3){
        filename_short[len-1] = 0;
    }
    strcat(filename_short, ".hcd");
    log_info("chipset-bcm: looking for %s and %s", filename_short, filename_complete);

    // find in folder
    DIR *dirp = opendir(hcd_folder_path);
    int match_short = 0;
    int match_complete = 0;
    if (!dirp){
        log_error("chipset-bcm: could not get directory for %s", hcd_folder_path);
        return;
    }
    while (1){
        struct dirent *dp = readdir(dirp);
        if (!dp) break;
        if (equal_ignore_case(filename_complete, dp->d_name)){
            match_complete = 1;
            continue;
        }
        if (equal_ignore_case(filename_short, dp->d_name)){
            match_short = 1;            
        }
    }
    closedir(dirp);
    if (match_complete){
        sprintf(matched_file, "%s/%s", hcd_folder_path, filename_complete);
        hcd_file_path = matched_file;
        return;
    }
    if (match_short){
        sprintf(matched_file, "%s/%s", hcd_folder_path, filename_short);
        hcd_file_path = matched_file;
        return;
    }
    log_error("chipset-bcm: could not find %s or %s, please provide .hcd file in %s", filename_complete, filename_short, hcd_folder_path);
}

#else

static void chipset_init(const void * config){
    log_info("chipset-bcm: init script %s, len %u", brcm_patch_version, brcm_patch_ram_length);
    init_script_offset = 0;
    send_download_command = 1;
}

static btstack_chipset_result_t chipset_next_command(uint8_t * hci_cmd_buffer){
    // send download firmware command
    if (send_download_command){
        send_download_command = 0;
        hci_cmd_buffer[0] = 0x2e;
        hci_cmd_buffer[1] = 0xfc;
        hci_cmd_buffer[2] = 0x00;
        return BTSTACK_CHIPSET_VALID_COMMAND;
    }

    if (init_script_offset >= brcm_patch_ram_length) {
        return BTSTACK_CHIPSET_DONE;
    }

    int cmd_len = 3 + brcm_patchram_buf[init_script_offset+2];
    memcpy(&hci_cmd_buffer[0], &brcm_patchram_buf[init_script_offset], cmd_len); 
    init_script_offset += cmd_len;
    return BTSTACK_CHIPSET_VALID_COMMAND;     
}
#endif


static const btstack_chipset_t btstack_chipset_bcm = {
    "BCM",
    chipset_init,
    chipset_next_command,
    chipset_set_baudrate_command,
    chipset_set_bd_addr_command,
};

// MARK: public API
const btstack_chipset_t * btstack_chipset_bcm_instance(void){
    return &btstack_chipset_bcm;
}