/*
www.sourceforge.net/projects/dfhack
Copyright (c) 2009 Petr Mrázek (peterix), Kenneth Ferland (Impaler[WrG]), dorf

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.

Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product documentation
would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source
distribution.
*/

#include "Internal.h"
#include "ContextShared.h"
#include "dfhack/DFTypes.h"
#include "dfhack/VersionInfo.h"
#include "dfhack/DFProcess.h"
#include "dfhack/DFVector.h"
#include "dfhack/modules/Materials.h"
#include "dfhack/modules/Items.h"

using namespace DFHack;

enum accessor_type {ACCESSOR_CONSTANT, ACCESSOR_INDIRECT, ACCESSOR_DOUBLE_INDIRECT};

/* this is used to store data about the way accessors work */
class DFHACK_EXPORT Accessor
{
private:
    accessor_type type;
    int32_t constant;
    uint32_t offset1;
    uint32_t offset2;
    Process * p;
    uint32_t dataWidth;
public:
    Accessor(uint32_t function, Process * p);
    Accessor(accessor_type type, int32_t constant, uint32_t offset1, uint32_t offset2, uint32_t dataWidth, Process * p);
    int32_t getValue(uint32_t objectPtr);
    bool isConstant();
};
class DFHACK_EXPORT ItemImprovementDesc
{
private:
    Accessor * AType;
    Process * p;
public:
    ItemImprovementDesc(uint32_t VTable, Process * p);
    bool getImprovement(uint32_t descptr, t_improvement & imp);
    uint32_t vtable;
    uint32_t maintype;
};

class DFHACK_EXPORT ItemDesc
{
private:
    Accessor * AMainType;
    Accessor * ASubType;
    Accessor * ASubIndex;
    Accessor * AIndex;
    Accessor * AQuality;
    Process * p;
    bool hasDecoration;
public:
    ItemDesc(uint32_t VTable, Process * p);
    bool getItem(uint32_t itemptr, t_item & item);
    std::string className;
    uint32_t vtable;
    uint32_t mainType;
    std::vector<ItemImprovementDesc> improvement;
};


// FIXME: this is crazy
Accessor::Accessor(uint32_t function, Process *p)
{
    this->p = p;
    this->constant = 0;
    this->offset1 = 0;
    this->offset2 = 0;
    this->type = ACCESSOR_CONSTANT;
    this->dataWidth = 2;
    uint64_t funcText = p->readQuad(function);
    if( funcText == 0xCCCCCCCCCCC3C033LL )
    {
        return;
    }
    if( funcText == 0xCCCCCCCCC3FFC883LL )
    {
        /* or eax,-1; ret; */
        this->constant = -1;
        return;
    }
    if( (funcText&0xFFFFFFFFFF0000FFLL) == 0xCCCCC300000000B8LL )
    {
        /* mov eax, xx; ret; */
        this->constant = (funcText>>8) & 0xffff;
        return;
    }
    if( (funcText&0xFFFFFF0000FFFFFFLL) == 0xC300000000818B66LL )
    {
        /* mov ax, [ecx+xx]; ret; */
        this->type = ACCESSOR_INDIRECT;
        this->offset1 = (funcText>>24) & 0xffff;
        return;
    }
    if( (funcText&0x000000FF00FFFFFFLL) == 0x000000C300418B66LL )
    {
        /* mov ax, [ecx+xx]; ret; (shorter instruction)*/
        this->type = ACCESSOR_INDIRECT;
        this->offset1 = (funcText>>24) & 0xff;
        return;
    }
    if( (funcText&0x00000000FF00FFFFLL) == 0x00000000C300418BLL )
    {
        /* mov eax, [ecx+xx]; ret; */
        this->type = ACCESSOR_INDIRECT;
        this->offset1 = (funcText>>16) & 0xff;
        this->dataWidth = 4;
        return;
    }
    if( (funcText&0xFFFFFFFF0000FFFFLL) == 0x8B6600000000818BLL )
    {
        uint64_t funcText2 = p->readQuad(function+8);
        if( (funcText2&0xFFFFFFFFFFFF00FFLL) == 0xCCCCCCCCCCC30040LL )
        {
            this->type = ACCESSOR_DOUBLE_INDIRECT;
            this->offset1 = (funcText>>16) & 0xffff;
            this->offset2 = (funcText2>>8) & 0xff;
            return;
        }
    }
    if( (funcText&0xFFFFFF0000FFFFFFLL) == 0xC30000000081BF0FLL )
    {
        /* movsx   eax, word ptr [ecx+xx]; ret */
        this->type = ACCESSOR_INDIRECT;
        this->offset1 = (funcText>>24) & 0xffff;
        return;
    }
    if( (funcText&0x000000FF00FFFFFFLL) == 0x000000C30041BF0FLL )
    {
        /* movsx   eax, word ptr [ecx+xx]; ret (shorter opcode)*/
        this->type = ACCESSOR_INDIRECT;
        this->offset1 = (funcText>>24) & 0xff;
        return;
    }
    if( (funcText&0xFFFFFFFF0000FFFFLL) == 0xCCC300000000818BLL )
    {
        /* mov eax, [ecx+xx]; ret; */
        this->type = ACCESSOR_INDIRECT;
        this->offset1 = (funcText>>16) & 0xffff;
        this->dataWidth = 4;
        return;
    }
    printf("bad accessor @0x%x\n", function);
}

bool Accessor::isConstant()
{
    if(this->type == ACCESSOR_CONSTANT)
        return true;
    else
        return false;
}

int32_t Accessor::getValue(uint32_t objectPtr)
{
    switch(this->type)
    {
    case ACCESSOR_CONSTANT:
        return this->constant;
        break;
    case ACCESSOR_INDIRECT:
        switch(this->dataWidth)
        {
        case 2:
            return (int16_t) p->readWord(objectPtr + this->offset1);
        case 4:
            return p->readDWord(objectPtr + this->offset1);
        default:
            return -1;
        }
        break;
    case ACCESSOR_DOUBLE_INDIRECT:
        switch(this->dataWidth)
        {
        case 2:
            return (int16_t) p->readWord(p->readDWord(objectPtr + this->offset1) + this->offset2);
        case 4:
            return p->readDWord(p->readDWord(objectPtr + this->offset1) + this->offset2);
        default:
            return -1;
        }
        break;
    default:
        return -1;
    }
}

ItemDesc::ItemDesc(uint32_t VTable, Process *p)
{
    OffsetGroup * Items = p->getDescriptor()->getGroup("Items");
    uint32_t funcOffsetA = Items->getOffset("item_type_accessor");
    uint32_t funcOffsetB = Items->getOffset("item_subtype_accessor");
    uint32_t funcOffsetC = Items->getOffset("item_subindex_accessor");
    uint32_t funcOffsetD = Items->getOffset("item_index_accessor");
    uint32_t funcOffsetQuality = Items->getOffset("item_quality_accessor");
    this->vtable = VTable;
    this->p = p;
    this->className = p->readClassName(VTable).substr(5);
    this->className.resize(this->className.size()-2);
    this->AMainType = new Accessor( p->readDWord( VTable + funcOffsetA ), p);
    this->ASubType = new Accessor( p->readDWord( VTable + funcOffsetB ), p);
    this->ASubIndex = new Accessor( p->readDWord( VTable + funcOffsetC ), p);
    this->AIndex = new Accessor( p->readDWord( VTable + funcOffsetD ), p);
    this->AQuality = new Accessor( p->readDWord( VTable + funcOffsetQuality ), p);
    this->hasDecoration = false;
    if(this->AMainType->isConstant())
        this->mainType = this->AMainType->getValue(0);
    else
    {
        fprintf(stderr, "Bad item main type at function %p\n", (void*) p->readDWord( VTable + funcOffsetA ));
        this->mainType = 0;
    }
}

bool ItemDesc::getItem(uint32_t itemptr, DFHack::t_item &item)
{
    item.matdesc.itemType = this->AMainType->getValue(itemptr);
    item.matdesc.subType = this->ASubType->getValue(itemptr);
    item.matdesc.subIndex = this->ASubIndex->getValue(itemptr);
    item.matdesc.index = this->AIndex->getValue(itemptr);
    item.quality = this->AQuality->getValue(itemptr);
    item.quantity = 1; /* TODO */
    return true;
}

class Items::Private
{
    public:
        DFContextShared *d;
        Process * owner;
        std::map<int32_t, ItemDesc *> descType;
        std::map<uint32_t, ItemDesc *> descVTable;
};

Items::Items(DFContextShared * d_)
{
    d = new Private;
    d->d = d_;
    d->owner = d_->p;
}
bool Items::Start(){return true;}
bool Items::Finish(){return true;}
Items::~Items()
{
    Finish();
    std::map<uint32_t, ItemDesc *>::iterator it;
    it = d->descVTable.begin();
    while (it != d->descVTable.end())
    {
        delete (*it).second;
    }
    d->descType.clear();
    d->descVTable.clear();
    delete d;
}

bool Items::getItemData(uint32_t itemptr, DFHack::t_item &item)
{
    std::map<uint32_t, ItemDesc *>::iterator it;
    Process * p = d->owner;
    ItemDesc * desc;

    it = d->descVTable.find(itemptr);
    if(it==d->descVTable.end())
    {
        uint32_t vtable = p->readDWord(itemptr);
        desc = new ItemDesc(vtable, p);
        d->descVTable[vtable] = desc;
        d->descType[desc->mainType] = desc;
    }
    else
        desc = it->second;

    return desc->getItem(itemptr, item);
}

std::string Items::getItemClass(int32_t index)
{
    std::map<int32_t, ItemDesc *>::iterator it;
    std::string out;

    it = d->descType.find(index);
    if(it==d->descType.end())
    {
        /* these are dummy values for mood decoding */
        switch(index)
        {
            case 0: return "bar";
            case 1: return "cut gem";
            case 2: return "block";
            case 3: return "raw gem";
            case 4: return "raw stone";
            case 5: return "log";
            case 54: return "leather";
            case 57: return "cloth";
            case -1: return "probably bone or shell, but I really don't know";
            default: return "unknown";
        }
    }
    out = it->second->className;
    return out;
}

std::string Items::getItemDescription(uint32_t itemptr, Materials * Materials)
{
    DFHack::t_item item;
    std::string out;

    if(!this->getItemData(itemptr, item))
        return "??";
    switch(item.quality)
    {
        case 0: break;
        case 1: out.append("Well crafted "); break;
        case 2: out.append("Finely crafted "); break;
        case 3: out.append("Superior quality "); break;
        case 4: out.append("Exceptionnal "); break;
        case 5: out.append("Masterful "); break;
        default: out.append("Crazy quality "); break;
    }
    out.append(Materials->getDescription(item.matdesc));
    out.append(" ");
    out.append(this->getItemClass(item.matdesc.itemType));
    return out;
}