/*
 *  hci.c
 *
 *  Created by Matthias Ringwald on 4/29/09.
 *
 */

#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include "hci.h"

// calculate combined ogf/ocf value
#define OPCODE(ogf, ocf) (ocf | ogf << 10)
#define OGF_LINK_CONTROL 0x01
#define OGF_CONTROLLER_BASEBAND 0x03

hci_cmd_t hci_inquiry = {
    OPCODE(OGF_LINK_CONTROL, 0x01), "311"
    // LAP, Inquiry length, Num_responses
};

hci_cmd_t hci_link_key_request_negative_reply = {
    OPCODE(OGF_LINK_CONTROL, 0x0c), "B"
};

hci_cmd_t hci_pin_code_request_reply = {
    OPCODE(OGF_LINK_CONTROL, 0x0d), "B1P"
    // BD_ADDR, pin length, PIN: c-string
};

hci_cmd_t hci_reset = {
    OPCODE(OGF_CONTROLLER_BASEBAND, 0x03), ""
};

hci_cmd_t hci_create_connection = {
    OPCODE(OGF_LINK_CONTROL, 0x05), "B21121"
    // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch
};

hci_cmd_t hci_write_page_timeout = {
    OPCODE(OGF_CONTROLLER_BASEBAND, 0x18), "2"
    // Page_Timeout * 0.625 ms
};

hci_cmd_t hci_write_authentication_enable = {
    OPCODE(OGF_CONTROLLER_BASEBAND, 0x20), "1"
    // Authentication_Enable
};

hci_cmd_t hci_host_buffer_size = {
    OPCODE(OGF_CONTROLLER_BASEBAND, 0x33), "2122"
    // Host_ACL_Data_Packet_Length:, Host_Synchronous_Data_Packet_Length:, Host_Total_Num_ACL_Data_Packets:, Host_Total_Num_Synchronous_Data_Packets:
};


static hci_transport_t * hci_transport;
static uint8_t         * hci_cmd_buffer;

void hexdump(uint8_t *data, int size){
    int i;
    for (i=0; i<size;i++){
        printf("%02X ", data[i]);
    }
    printf("\n");
}

#if 0
static void *hci_daemon_thread(void *arg){
    printf("HCI Daemon started\n");
    hci_run(transport, &config);
    return NULL;
}
#endif

void hci_init(hci_transport_t *transport, void *config){
    
    // reference to use transport layer implementation
    hci_transport = transport;
    
    // empty cmd buffer
    hci_cmd_buffer = malloc(3+255);
    
    // open unix socket
    
    // wait for connections
    
    // enter loop
    
    // handle events
}

int hci_power_control(HCI_POWER_MODE power_mode){
    return 0;
}

void hci_run(){
    while (1) {
        //  construct file descriptor set to wait for
        //  select
        
        // for each ready file in FD - call handle_data
        sleep(1);
    }
}

int hci_send_cmd(hci_cmd_t *cmd, ...){
    hci_cmd_buffer[0] = cmd->opcode & 0xff;
    hci_cmd_buffer[1] = cmd->opcode >> 8;
    int pos = 3;

    va_list argptr;
    va_start(argptr, cmd);
    const char *format = cmd->format;
    uint16_t word;
    uint32_t longword;
    uint8_t * ptr;
    while (*format) {
        switch(*format) {
            case '1': //  8 bit value
            case '2': // 16 bit value
            case 'H': // hci_handle
                word = va_arg(argptr, int);  // minimal va_arg is int: 2 bytes on 8+16 bit CPUs
                hci_cmd_buffer[pos++] = word & 0xff;
                if (*format == '2') {
                    hci_cmd_buffer[pos++] = word >> 8;
                } else if (*format == 'H') {
                    // TODO
                } 
                break;
            case '3':
            case '4':
                longword = va_arg(argptr, uint32_t);
                // longword = va_arg(argptr, int);
                hci_cmd_buffer[pos++] = longword;
                hci_cmd_buffer[pos++] = longword >> 8;
                hci_cmd_buffer[pos++] = longword >> 16;
                if (*format == '4'){
                    hci_cmd_buffer[pos++] = longword >> 24;
                }
                break;
            case 'B': // bt-addr
                ptr = va_arg(argptr, uint8_t *);
                hci_cmd_buffer[pos++] = ptr[5];
                hci_cmd_buffer[pos++] = ptr[4];
                hci_cmd_buffer[pos++] = ptr[3];
                hci_cmd_buffer[pos++] = ptr[2];
                hci_cmd_buffer[pos++] = ptr[1];
                hci_cmd_buffer[pos++] = ptr[0];
                break;
            case 'P': // c string passed as pascal string with leading 1-byte len
                ptr = va_arg(argptr, uint8_t *);
                memcpy(&hci_cmd_buffer[pos], ptr, 16);
                pos += 16;
                break;
            default:
                break;
        }
        format++;
    };
    va_end(argptr);
    hci_cmd_buffer[2] = pos - 3;
    // send packet
    return hci_transport->send_cmd_packet(hci_cmd_buffer, pos);
}