/// Simple dumper UI, no interactive input.
/// Copyright: dd86k <dd@dax.moe>
/// License: MIT
/// Authors: $(LINK2 https://github.com/dd86k, dd86k)
module dumper.app;

import std.stdio;
import std.file;
import core.stdc.stdlib : malloc;
import ddhx.common;
import ddhx.transcoder;
import ddhx.utils.math;
import ddhx.os.terminal;
import ddhx.display;

private enum CHUNKSIZE = 16 * 1024;

// NOTE: if path is null, then stdin is used
int dump(string path)
{
    scope buffer = new ubyte[CHUNKSIZE];
    
    // opAssign is bugged on ldc with optimizations
    File file;
    if (path)
    {
        file = File(path, "rb");
        
        if (_opos) file.seek(_opos);
    }
    else
    {
        file = stdin;
        
        // Read blocks until length
        if (_opos)
        {
        Lskip:
            size_t rdsz = min(_opos, CHUNKSIZE);
            if (file.rawRead(buffer[0..rdsz]).length == CHUNKSIZE)
                goto Lskip;
        }
    }
    
    disp_init(false);
    
    BUFFER *dispbuf = disp_create(CHUNKSIZE / _ocolumns, _ocolumns, 0);
    if (dispbuf == null)
    {
        stderr.writeln("error: Unknown error creating display");
        return 10;
    }
    
    disp_header(_ocolumns);
    long address;
    foreach (chunk; file.byChunk(CHUNKSIZE))
    {
        //disp_update(address, chunk, _ocolumns);
        disp_render_buffer(dispbuf, address, chunk, _ocolumns,
            _odatafmt, _oaddrfmt, _ofillchar, _ocharset, _oaddrpad, 1);
        disp_print_buffer(dispbuf);
        
        address += chunk.length;
    }
    
    return 0;
}