//
//  main.c
//  H64E-2
//
//  Created by dianshi on 3/13/20.
//  Copyright © 2020 dianshi. All rights reserved.
//

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <getopt.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include "h64e.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int file_open( const char *fname )
{
    int fd;

    fd = open( fname, O_RDONLY );
    if ( fd == -1 )
    {
        printf("Couldn open file %s\n", fname);
        return -1;
    }

    return fd;
}

int file_read( int fd, char *buf, int size )
{
    int ret;

    if ( size < 1 )
        return -1;

    ret = (int)read( fd, buf, size );

    return ret;
}

int file_seek( int fd, off_t pos )
{
    off_t rc;

    if (fd<1)
    {
        return -1;
    }

    rc = lseek( fd, pos, SEEK_SET );
    if (rc == -1)
        return -1;
    return 0;

}

int file_close( int fd )
{

    close( fd );

    return 0;
}

int group_name2int( char *name )
{
    if ( 0 == strncmp( name, "byte", 4 ) )
    {
        return H64E_G_BYTE;
    }
    if ( 0 == strncmp( name, "word", 4 ) )
    {
        return H64E_G_WORD;
    }
    if ( 0 == strncmp( name, "dword", 5 ) )
    {
        return H64E_G_DWORD;
    }
    if ( 0 == strncmp( name, "qword", 5 ) )
    {
        return H64E_G_QWORD;
    }

    return 1;
}

int output_name2int( char *name )
{
    if ( 0 == strncmp( name, "str", 3) )
    {
        return H64E_O_STRING;
    }
    if ( 0 == strncmp( name, "i8", 2) )
    {
        return H64E_O_INT8;
    }
    if ( 0 == strncmp( name, "u8", 2) )
    {
        return H64E_O_UINT8;
    }
    if ( 0 == strncmp( name, "i16", 3) )
    {
        return H64E_O_INT16;
    }
    if ( 0 == strncmp( name, "u16", 3) )
    {
        return H64E_O_UINT16;
    }
    if ( 0 == strncmp( name, "i32", 3) )
    {
        return H64E_O_INT32;
    }
    if ( 0 == strncmp( name, "u32", 3) )
    {
        return H64E_O_UINT32;
    }
    if ( 0 == strncmp( name, "i64", 3) )
    {
        return H64E_O_INT64;
    }
    if ( 0 == strncmp( name, "u64", 3) )
    {
        return H64E_O_UINT64;
    }
    return 0;
}

void helper( char *progname )
{
    printf("Usage: %s [OPTS] <filename>\n\n"
        " -a - asciimode\n"
        " -b - show offset adress\n"
        " -o - file offset\n"
        " -i - output hex\n"
        " -l - length of output\n"
        " -c - column size in byts\n"
        " -g - datatype output: byte,word,dword\n"
        " -e - interp data: u8,i8,u16,i16,u32,i32,u64,i64"
        "\nVersion: 0.1 \n"
        "\n"
        , progname);
}

void version()
{
    printf("???\n");
}


int main(int argc, const char * argv[]) {
    // insert code here...
    int c;
    int param_length = -1;
    int param_offset = -1;
    char *fname = NULL;
    int fd;
    
    printf("H64E-2 Project started 1\n");
    
    //initialise structure
    H64E_t h64e;
    h64e_init(&h64e);
    
    
    //set all params from arguments
    /*get cmd args and set options */
    while ( (c = getopt(argc, argv, "abo:il:vc:g:e:")) != -1 )
    {
        switch(c)
        {
        case 'a':
            h64e.fmt.group = H64E_G_BYTE;
            h64e.fmt.flag_output = 1;
            h64e.fmt.output_type = H64E_O_STRING;
            break;
        case 'b':
            h64e.fmt.flag_offset = 1;
            break;
        case 'o':
            param_offset = atoi( optarg );
            break;
        case 'i':
            h64e.fmt.group = H64E_G_BYTE;
            h64e.fmt.flag_output = 0;
            h64e.fmt.flag_offset = 1;
            break;
        case 'l':
            param_length = atoi( optarg );
            break;
        case 'c':
            h64e.fmt.column_size = atoi(optarg);
            break;
        case 'g':
            h64e.fmt.group = group_name2int(optarg);
            break;
        case 'e':
            h64e.fmt.flag_output = 1;
            h64e.fmt.output_type = output_name2int(optarg);
            break;
        case 'v':
            version();
            exit(1);
            break;
        default:
            helper( argv[0] );
            exit(1);
        }
    }

    if ( argc < 2 )
    {
        printf("At least one argument needed now\n");
        helper( argv[0] );
        return 1;
    }

    /* last argument is file name */
    fname = argv[argc-1];

    /* check params */
    h64e_check_param( &h64e );

    /* open file */
    fd = file_open( fname );
    if ( fd == -1 )
    {
        printf("Cannot open file %s\n", fname);
        return -1;
    }
    
    //register formats
    
    //do conversation, reading input and outputing
    
    //deinit all structures
    h64e_destroy(&h64e);
    
    printf("Ending Execution\n");
    return 0;
}