/*
 *  Baltisot
 *  Copyright (C) 1999-2003 Nicolas "Pixel" Noble
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* $Id: LuaHandle.cc,v 1.18 2006-02-02 14:09:48 pixel Exp $ */

#include "LuaHandle.h"

LuaInput::LuaInput(Input * h) : LuaHandle(h) { }
LuaOutput::LuaOutput(Output * h) : LuaHandle(h) { }
LuaBuffer::LuaBuffer(Buffer * h) : LuaHandle(h) { }
LuaHandle::LuaHandle(Handle * _h) : h(_h) { }

class sLuaHandle : public Base {
  public:
    static int newinput(lua_State * L);
    static int newoutput(lua_State * L);
    static int newbuffer(lua_State * L);
    static int read(lua_State * L);
    static int readstring(lua_State * L);
    static int readU8(lua_State * L);
    static int readU16(lua_State * L);
    static int readU32(lua_State * L);
    static int write(lua_State * L);
    static int writestring(lua_State * L);
    static int writeU8(lua_State * L);
    static int writeU16(lua_State * L);
    static int writeU32(lua_State * L);
    static int copyfrom(lua_State * L);
    static int copyto(lua_State * L);
    static int isclosed(lua_State * L);
    static int isnonblock(lua_State * L);
    static int canread(lua_State * L);
    static int canwrite(lua_State * L);
    static int canseek(lua_State * L);
    static int canwatch(lua_State * L);
    static int setnonblock(lua_State * L);
    static int tell(lua_State * L);
    static int getname(lua_State * L);
    static int getsize(lua_State * L);
    static int getmodif(lua_State * L);
    static int close(lua_State * L);
    static int flush(lua_State * L);
    static int seek(lua_State * L);
    static int setz(lua_State * L);
    static int bindex(lua_State * L);
    static int bnewindex(lua_State * L);
    static int bseek(lua_State * L);
    static int btell(lua_State * L);
    static int exists(lua_State * L);
  private:
    static int read(lua_State * L, int);
    static int write(lua_State * L, int);
    static int copy(lua_State * L, int);
    static int getcaps(lua_State * L, int);
    static int action(lua_State * L, int);
    enum {
	U8, U16, U32
    };
    enum {
	from, to
    };
    enum {
	capisclosed, capisnonblock, capcanread, capcanwrite, capcanseek, capcanwatch
    };
    enum {
	Asetnonblock, Atell, Agetname, Agetsize, Agetmodif, Aclose, Aflush
    };
};

void LuaInput::pushconstruct(Lua * L) {
    L->declarefunc("Input", sLuaHandle::newinput);
}

void LuaOutput::pushconstruct(Lua * L) {
    L->declarefunc("Output", sLuaHandle::newoutput);
}

void LuaBuffer::pushconstruct(Lua * L) {
    L->declarefunc("Buffer", sLuaHandle::newbuffer);
}

int sLuaHandle::newinput(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();

    if ((n != 1) || !L->isstring()) {
	L->error("Incorrect arguments to constructor `Input'");
    }

    LuaInput i(new Input(L->tostring()));
    i.pushdestruct(L);

    return 1;
}

int sLuaHandle::newoutput(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();

    if ((n != 1) || !L->isstring()) {
	L->error("Incorrect arguments to constructor `Input'");
    }

    LuaOutput o(new Output(L->tostring()));
    o.pushdestruct(L);

    return 1;
}

int sLuaHandle::newbuffer(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    bool seekable = false;

    if ((n > 1) || ((n == 1) && (!L->isboolean()))) {
	L->error("Incorrect arguments to constructor `Buffer'");
    }

    if (n == 1)
        seekable = L->toboolean();

    LuaBuffer o(new Buffer(seekable));
    o.pushdestruct(L);

    return 1;
}

int sLuaHandle::read(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop(), i;
    size_t t;
    ssize_t r;
    Handle * h;
    Byte * b;

    if (n == 1) {
	return readstring(__L);
    }

    if ((n != 2) || !L->isnumber()) {
	L->error("Incorrect arguments to method `Headle::read'");
    }

    t = L->tonumber();
    b = (Byte *) malloc(t);
    h = (Handle *) LuaObject::getme(L);

    L->newtable();

    r = h->read(b, t);

    for (i = 0; i < r; i++) {
	L->push((lua_Number) i);
	L->push((lua_Number) b[i]);
	L->settable();
    }

    free(b);

    L->push((lua_Number) r);

    return 2;
}

int sLuaHandle::readstring(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    Handle * h;
    String r;

    if (n != 1) {
	L->error("Incorrect arguments to method `Headle::readstring'");
    }

    h = (Handle *) LuaObject::getme(L);

    (*h) >> r;

    L->push(r);

    return 1;
}

int sLuaHandle::readU8(lua_State * L) {
    return read(L, U8);
}

int sLuaHandle::readU16(lua_State * L) {
    return read(L, U16);
}

int sLuaHandle::readU32(lua_State * L) {
    return read(L, U32);
}

int sLuaHandle::write(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop(), i;
    size_t t;
    ssize_t r;
    Handle * h;
    Byte * b;

    if ((n == 2) && L->isstring()) {
	return writestring(__L);
    }

    if ((n != 3) || !L->isnumber() || !L->istable(2)) {
	L->error("Incorrect arguments to method `Headle::write'");
    }

    t = L->tonumber();
    b = (Byte *) malloc(t);
    h = (Handle *) LuaObject::getme(L);

    for (i = 0; i < t; i++) {
	L->push((lua_Number) i);
	L->gettable(2);
	b[i] = L->tonumber();
	L->pop();
    }

    r = h->write(b, t);

    free(b);

    L->push((lua_Number) r);

    return 1;
}

int sLuaHandle::writestring(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    Handle * h;
    String r;

    if ((n != 2) || !L->isstring()) {
	L->error("Incorrect arguments to method `Headle::writestring'");
    }

    h = (Handle *) LuaObject::getme(L);
    r = L->tostring();

    (*h) << r;

    return 0;
}

int sLuaHandle::writeU8(lua_State * L) {
    return write(L, U8);
}

int sLuaHandle::writeU16(lua_State * L) {
    return write(L, U16);
}

int sLuaHandle::writeU32(lua_State * L) {
    return write(L, U32);
}

int sLuaHandle::read(lua_State * __L, int t) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    lua_Number r;
    Handle * h;

    if (n != 1) {
	L->error("Incorrect arguments to method `Headle::readUx'");
    }

    h = (Handle *) LuaObject::getme(L);

    switch (t) {
	case U8:  r = h->readU8(); break;
	case U16: r = h->readU16(); break;
	case U32: r = h->readU32(); break;
    }

    L->push(r);

    return 1;
}

int sLuaHandle::write(lua_State * __L, int t) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    lua_Number r;
    Handle * h;

    if ((n != 2) || !L->isnumber()) {
	L->error("Incorrect arguments to method `Headle::writeUx'");
    }

    h = (Handle *) LuaObject::getme(L);
    r = L->tonumber();

    switch (t) {
	case U8:  h->writeU8(r); break;
	case U16: h->writeU16(r); break;
	case U32: h->writeU32(r); break;
    }

    return 0;
}

int sLuaHandle::copyfrom(lua_State * L) {
    return copy(L, from);
}

int sLuaHandle::copyto(lua_State * L) {
    return copy(L, to);
}

int sLuaHandle::copy(lua_State * __L, int dir) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    lua_Number r;
    Handle * s, * d;

    if ((n < 2) || (n > 3) || ((n == 3) && !L->isnumber(3))) {
	L->error("Incorrect arguments to function `handlecopy'");
    }

    s = (Handle *) LuaObject::getme(L, 1);
    d = (Handle *) LuaObject::getme(L, 2);

    if (n == 3) {
	r = L->tonumber();
    } else {
	r = -1;
    }

    if (dir == from) {
	SWAP(s, d);
    }

    s->copyto(d, r);

    return 0;
}

int sLuaHandle::isclosed(lua_State * L) {
    return getcaps(L, capisclosed);
}

int sLuaHandle::isnonblock(lua_State * L) {
    return getcaps(L, capisnonblock);
}

int sLuaHandle::canread(lua_State * L) {
    return getcaps(L, capcanread);
}

int sLuaHandle::canwrite(lua_State * L) {
    return getcaps(L, capcanwrite);
}

int sLuaHandle::canseek(lua_State * L) {
    return getcaps(L, capcanseek);
}

int sLuaHandle::canwatch(lua_State * L) {
    return getcaps(L, capcanwatch);
}

int sLuaHandle::getcaps(lua_State * __L, int cap) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    bool r;
    Handle * h;

    if (n != 1) {
	L->error("Incorrect arguments to method `Handle::getcaps'");
    }

    h = (Handle *) LuaObject::getme(L);

    switch (cap) {
	case capisclosed: r = h->IsClosed(); break;
	case capisnonblock: r = h->IsNonBlock(); break;
	case capcanread: r = h->CanRead(); break;
	case capcanwrite: r = h->CanWrite(); break;
	case capcanseek: r = h->CanSeek(); break;
	case capcanwatch: r = h->CanWatch(); break;
    }

    L->push(r);

    return 1;
}

int sLuaHandle::setnonblock(lua_State * L) {
    return action(L, Asetnonblock);
}

int sLuaHandle::tell(lua_State * L) {
    return action(L, Atell);
}

int sLuaHandle::getname(lua_State * L) {
    return action(L, Agetname);
}

int sLuaHandle::getsize(lua_State * L) {
    return action(L, Agetsize);
}

int sLuaHandle::getmodif(lua_State * L) {
    return action(L, Agetmodif);
}

int sLuaHandle::close(lua_State * L) {
    return action(L, Aclose);
}

int sLuaHandle::flush(lua_State * L) {
    return action(L, Aflush);
}

int sLuaHandle::action(lua_State * __L, int act) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    int r = 1;
    Handle * h;

    if (n != 1) {
	L->error("Incorrect arguments to method `Handle::action'");
    }

    h = (Handle *) LuaObject::getme(L);
    
    switch (act) {
	case Asetnonblock: r = 0; h->SetNonBlock(); break;
	case Atell: L->push((lua_Number) h->tell()); break;
	case Agetname: L->push(h->GetName()); break;
	case Agetsize: L->push((lua_Number) h->GetSize()); break;
	case Agetmodif: L->push((lua_Number) h->GetModif()); break;
	case Aclose: r = 0; h->close(); break;
	case Aflush: r = 0; h->Flush(); break;
    }

    return r;
}

int sLuaHandle::setz(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    int z = 9;
    Handle * h;

    if ((n < 1) || (n > 2) || ((n == 2) && !L->isnumber(2))) {
	L->error("Incorrect arguments to method `Handle::setz'");
    }

    h = (Handle *) LuaObject::getme(L);

    if (n == 2) {
	z = L->tonumber(2);
    }

    h->SetZ(z);

    return 0;
}

int sLuaHandle::seek(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    off_t off;
    int wheel;
    Handle * h;

    if ((n < 2) || (n > 3) || !L->isnumber(2) || ((n == 3) && !L->isnumber(3))) {
	L->error("Incorrect arguments to method `Handle::seek'");
    }

    h = (Handle *) LuaObject::getme(L);

    off = L->tonumber(2);

    if (n == 3) {
	wheel = L->tonumber(3);
    } else {
        wheel = SEEK_SET;
    }

    L->push((lua_Number) h->seek(off, wheel));

    return 1;
}

int sLuaHandle::bindex(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    const Buffer * b;

    if (n != 2) {
        L->error("Inconsistant call to metamethod Buffer::index");
    }

    if (!L->isnumber()) {
        L->push();
        return 1;
    }

    b = (Buffer *) LuaObject::getme(L);

    L->push((lua_Number) (*b)[L->tonumber()]);

    return 1;
}

int sLuaHandle::bnewindex(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    Buffer * b;

    if (n != 3) {
        L->error("Inconsistant call to metamethod Buffer::newindex");
    }

    if (!L->isnumber(2)) {
        L->settable(1, true);
        return 0;
    }

    if (!L->isnumber(3)) {
        L->error("Can't write a non-number to buffer");
    }

    b = (Buffer *) LuaObject::getme(L);

    (*b)[L->tonumber(2)] = L->tonumber(3);

    return 0;
}

int sLuaHandle::btell(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    Buffer * h;

    if (n != 1) {
	L->error("Incorrect arguments to method `Buffer::wtell'");
    }

    h = (Buffer *) LuaObject::getme(L);    
    L->push((lua_Number) h->wtell());
    return 1;
}

int sLuaHandle::bseek(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    off_t off;
    int wheel;
    Buffer * h;

    if ((n < 2) || (n > 3) || !L->isnumber(2) || ((n == 3) && !L->isnumber(3))) {
	L->error("Incorrect arguments to method `Buffer::wseek'");
    }

    h = (Buffer *) LuaObject::getme(L);

    off = L->tonumber(2);

    if (n == 3) {
	wheel = L->tonumber(3);
    } else {
        wheel = SEEK_SET;
    }

    L->push((lua_Number) h->wseek(off, wheel));

    return 1;
}

int sLuaHandle::exists(lua_State * __L) {
    Lua * L = Lua::find(__L);
    int n = L->gettop();
    bool r = true;
    
    if (n != 1) {
	L->error("Incorrect number of arguments to function exists");
    }
    
    try {
	Input testing(L->tostring());
    }
    catch (IOGeneral &) {
	r = false;
    }
    
    L->push(r);
    
    return 1;
}

void LuaInput::pushmembers(Lua * L) {
    LuaHandle::pushmembers(L);
}

void LuaOutput::pushmembers(Lua * L) {
    LuaHandle::pushmembers(L);
}

void LuaBuffer::pushmembers(Lua * L) {
    LuaHandle::pushmembers(L);
    pushmeta(L, "__index", sLuaHandle::bindex);
    pushmeta(L, "__newindex", sLuaHandle::bnewindex);
    pushit(L, "wtell", sLuaHandle::btell);
    pushit(L, "wseek", sLuaHandle::bseek);
}

void LuaHandle::pushmembers(Lua * L) {
    pushme(L, h);

    pushit(L, "read", &sLuaHandle::read);
    pushit(L, "write", &sLuaHandle::write);

    pushit(L, "readstring", &sLuaHandle::readstring);
    pushit(L, "writestring", &sLuaHandle::writestring);

    pushit(L, "readU8", sLuaHandle::readU8);
    pushit(L, "readU16", sLuaHandle::readU16);
    pushit(L, "readU32", sLuaHandle::readU32);
    pushit(L, "writeU8", sLuaHandle::writeU8);
    pushit(L, "writeU16", sLuaHandle::writeU16);
    pushit(L, "writeU32", sLuaHandle::writeU32);

    pushit(L, "copyfrom", sLuaHandle::copyfrom);
    pushit(L, "copyto", sLuaHandle::copyto);

    pushit(L, "isclosed", sLuaHandle::isclosed);
    pushit(L, "isnonblock", sLuaHandle::isnonblock);
    pushit(L, "canread", sLuaHandle::canread);
    pushit(L, "canwrite", sLuaHandle::canwatch);
    pushit(L, "canseek", sLuaHandle::canseek);
    pushit(L, "canwatch", sLuaHandle::canwatch);

    pushit(L, "setnonblock", sLuaHandle::setnonblock);
    pushit(L, "tell", sLuaHandle::tell);
    pushit(L, "getname", sLuaHandle::getname);
    pushit(L, "getsize", sLuaHandle::getsize);
    pushit(L, "getmodif", sLuaHandle::getmodif);
    pushit(L, "close", sLuaHandle::close);
    pushit(L, "flush", sLuaHandle::flush);

    pushit(L, "seek", sLuaHandle::seek);
    pushit(L, "setz", sLuaHandle::setz);
}

void LuaHandle::pushconstruct(Lua * L) {
    L->declarefunc("handlecopy", sLuaHandle::copyfrom);
    L->declarefunc("exists", sLuaHandle::exists);

    L->push("SEEK_SET");
    L->push((lua_Number) SEEK_SET);
    L->settable(LUA_GLOBALSINDEX);

    L->push("SEEK_CUR");
    L->push((lua_Number) SEEK_CUR);
    L->settable(LUA_GLOBALSINDEX);

    L->push("SEEK_END");
    L->push((lua_Number) SEEK_END);
    L->settable(LUA_GLOBALSINDEX);
}