/*
 * Copyright 2011 Jacek Caban for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "initguid.h"

#include "vbscript.h"
#include "objsafe.h"
#include "mshtmhst.h"
#include "rpcproxy.h"
#include "vbscript_classes.h"
#include "vbsglobal.h"
#include "vbsregexp55.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(vbscript);
WINE_DECLARE_DEBUG_CHANNEL(heap);

DEFINE_GUID(GUID_NULL,0,0,0,0,0,0,0,0,0,0,0);

static HINSTANCE vbscript_hinstance;
static ITypeInfo *dispatch_typeinfo;

BSTR get_vbscript_string(int id)
{
    WCHAR buf[512];
    if(!LoadStringW(vbscript_hinstance, id, buf, ARRAY_SIZE(buf))) return NULL;
    return SysAllocString(buf);
}

BSTR get_vbscript_error_string(HRESULT error)
{
    BSTR ret;
    if(HRESULT_FACILITY(error) != FACILITY_VBS || !(ret = get_vbscript_string(HRESULT_CODE(error))))
        ret = get_vbscript_string(VBS_UNKNOWN_RUNTIME_ERROR);
    return ret;
}

#define MIN_BLOCK_SIZE  128
#define ARENA_FREE_FILLER  0xaa

static inline DWORD block_size(DWORD block)
{
    return MIN_BLOCK_SIZE << block;
}

void heap_pool_init(heap_pool_t *heap)
{
    memset(heap, 0, sizeof(*heap));
    list_init(&heap->custom_blocks);
}

void *heap_pool_alloc(heap_pool_t *heap, size_t size)
{
    struct list *list;
    void *tmp;

    size = (size+3)&~3;

    if(!heap->block_cnt) {
        if(!heap->blocks) {
            heap->blocks = heap_alloc(sizeof(void*));
            if(!heap->blocks)
                return NULL;
        }

        tmp = heap_alloc(block_size(0));
        if(!tmp)
            return NULL;

        heap->blocks[0] = tmp;
        heap->block_cnt = 1;
    }

    if(heap->offset + size <= block_size(heap->last_block)) {
        tmp = ((BYTE*)heap->blocks[heap->last_block])+heap->offset;
        heap->offset += size;
        return tmp;
    }

    if(size <= block_size(heap->last_block+1)) {
        if(heap->last_block+1 == heap->block_cnt) {
            tmp = heap_realloc(heap->blocks, (heap->block_cnt+1)*sizeof(void*));
            if(!tmp)
                return NULL;

            heap->blocks = tmp;
            heap->blocks[heap->block_cnt] = heap_alloc(block_size(heap->block_cnt));
            if(!heap->blocks[heap->block_cnt])
                return NULL;

            heap->block_cnt++;
        }

        heap->last_block++;
        heap->offset = size;
        return heap->blocks[heap->last_block];
    }

    list = heap_alloc(size + sizeof(struct list));
    if(!list)
        return NULL;

    list_add_head(&heap->custom_blocks, list);
    return list+1;
}

void *heap_pool_grow(heap_pool_t *heap, void *mem, DWORD size, DWORD inc)
{
    void *ret;

    if(mem == (BYTE*)heap->blocks[heap->last_block] + heap->offset-size
            && heap->offset+inc < block_size(heap->last_block)) {
        heap->offset += inc;
        return mem;
    }

    ret = heap_pool_alloc(heap, size+inc);
    if(ret) /* FIXME: avoid copying for custom blocks */
        memcpy(ret, mem, size);
    return ret;
}

void heap_pool_clear(heap_pool_t *heap)
{
    struct list *tmp;

    if(!heap)
        return;

    while((tmp = list_next(&heap->custom_blocks, &heap->custom_blocks))) {
        list_remove(tmp);
        heap_free(tmp);
    }

    if(WARN_ON(heap)) {
        DWORD i;

        for(i=0; i < heap->block_cnt; i++)
            memset(heap->blocks[i], ARENA_FREE_FILLER, block_size(i));
    }

    heap->last_block = heap->offset = 0;
    heap->mark = FALSE;
}

void heap_pool_free(heap_pool_t *heap)
{
    DWORD i;

    heap_pool_clear(heap);

    for(i=0; i < heap->block_cnt; i++)
        heap_free(heap->blocks[i]);
    heap_free(heap->blocks);

    heap_pool_init(heap);
}

heap_pool_t *heap_pool_mark(heap_pool_t *heap)
{
    if(heap->mark)
        return NULL;

    heap->mark = TRUE;
    return heap;
}

HRESULT get_dispatch_typeinfo(ITypeInfo **out)
{
    ITypeInfo *typeinfo;
    ITypeLib *typelib;
    HRESULT hr;

    if (!dispatch_typeinfo)
    {
        hr = LoadRegTypeLib(&IID_StdOle, STDOLE_MAJORVERNUM, STDOLE_MINORVERNUM, STDOLE_LCID, &typelib);
        if (FAILED(hr)) return hr;

        hr = ITypeLib_GetTypeInfoOfGuid(typelib, &IID_IDispatch, &typeinfo);
        ITypeLib_Release(typelib);
        if (FAILED(hr)) return hr;

        if (InterlockedCompareExchangePointer((void**)&dispatch_typeinfo, typeinfo, NULL))
            ITypeInfo_Release(typeinfo);
    }

    *out = dispatch_typeinfo;
    return S_OK;
}

static HRESULT WINAPI ClassFactory_QueryInterface(IClassFactory *iface, REFIID riid, void **ppv)
{
    *ppv = NULL;

    if(IsEqualGUID(&IID_IUnknown, riid)) {
        TRACE("(%p)->(IID_IUnknown %p)\n", iface, ppv);
        *ppv = iface;
    }else if(IsEqualGUID(&IID_IClassFactory, riid)) {
        TRACE("(%p)->(IID_IClassFactory %p)\n", iface, ppv);
        *ppv = iface;
    }

    if(*ppv) {
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    FIXME("(%p)->(%s %p)\n", iface, debugstr_guid(riid), ppv);
    return E_NOINTERFACE;
}

static ULONG WINAPI ClassFactory_AddRef(IClassFactory *iface)
{
    TRACE("(%p)\n", iface);
    return 2;
}

static ULONG WINAPI ClassFactory_Release(IClassFactory *iface)
{
    TRACE("(%p)\n", iface);
    return 1;
}

static HRESULT WINAPI ClassFactory_LockServer(IClassFactory *iface, BOOL fLock)
{
    TRACE("(%p)->(%x)\n", iface, fLock);
    return S_OK;
}

static const IClassFactoryVtbl VBScriptFactoryVtbl = {
    ClassFactory_QueryInterface,
    ClassFactory_AddRef,
    ClassFactory_Release,
    VBScriptFactory_CreateInstance,
    ClassFactory_LockServer
};

static IClassFactory VBScriptFactory = { &VBScriptFactoryVtbl };

static const IClassFactoryVtbl VBScriptRegExpFactoryVtbl = {
    ClassFactory_QueryInterface,
    ClassFactory_AddRef,
    ClassFactory_Release,
    VBScriptRegExpFactory_CreateInstance,
    ClassFactory_LockServer
};

static IClassFactory VBScriptRegExpFactory = { &VBScriptRegExpFactoryVtbl };

/******************************************************************
 *              DllMain (vbscript.@)
 */
BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
{
    TRACE("(%p %ld %p)\n", hInstDLL, fdwReason, lpv);

    switch(fdwReason)
    {
    case DLL_PROCESS_ATTACH:
        DisableThreadLibraryCalls(hInstDLL);
        vbscript_hinstance = hInstDLL;
        break;
    case DLL_PROCESS_DETACH:
        if (lpv) break;
        if (dispatch_typeinfo) ITypeInfo_Release(dispatch_typeinfo);
        release_regexp_typelib();
    }

    return TRUE;
}

/***********************************************************************
 *		DllGetClassObject	(vbscript.@)
 */
HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
{
    if(IsEqualGUID(&CLSID_VBScript, rclsid)) {
        TRACE("(CLSID_VBScript %s %p)\n", debugstr_guid(riid), ppv);
        return IClassFactory_QueryInterface(&VBScriptFactory, riid, ppv);
    }else if(IsEqualGUID(&CLSID_VBScriptRegExp, rclsid)) {
        TRACE("(CLSID_VBScriptRegExp %s %p)\n", debugstr_guid(riid), ppv);
        return IClassFactory_QueryInterface(&VBScriptRegExpFactory, riid, ppv);
    }

    FIXME("%s %s %p\n", debugstr_guid(rclsid), debugstr_guid(riid), ppv);
    return CLASS_E_CLASSNOTAVAILABLE;
}