#ifndef __DNA_COMMON_HPP__
#define __DNA_COMMON_HPP__

#include <cstdio>
#include "logvisor/logvisor.hpp"
#include "athena/DNAYaml.hpp"
#include "hecl/Database.hpp"
#include "../SpecBase.hpp"
#include "boo/ThreadLocalPtr.hpp"
#include "zeus/CColor.hpp"

namespace DataSpec
{
struct SpecBase;

extern logvisor::Module LogDNACommon;
extern ThreadLocalPtr<SpecBase> g_curSpec;
extern ThreadLocalPtr<class PAKRouterBase> g_PakRouter;
extern ThreadLocalPtr<hecl::blender::Token> g_ThreadBlenderToken;

/* This comes up a great deal */
typedef athena::io::DNA<athena::Big> BigDNA;
typedef athena::io::DNAV<athena::Big> BigDNAV;
typedef athena::io::DNAVYaml<athena::Big> BigDNAVYaml;

/** FourCC with DNA read/write */
class DNAFourCC final : public BigDNA, public hecl::FourCC
{
public:
    DNAFourCC() : hecl::FourCC() {}
    DNAFourCC(const hecl::FourCC& other)
    : hecl::FourCC() {num = other.toUint32();}
    DNAFourCC(const char* name)
    : hecl::FourCC(name) {}
    DNAFourCC(uint32_t n)
    : hecl::FourCC(n) {}
    AT_DECL_EXPLICIT_DNA_YAML
};
template <> inline void DNAFourCC::Enumerate<BigDNA::Read>(typename Read::StreamT& r)
{ r.readUBytesToBuf(fcc, 4); }
template <> inline void DNAFourCC::Enumerate<BigDNA::Write>(typename Write::StreamT& w)
{ w.writeUBytes((atUint8*)fcc, 4); }
template <> inline void DNAFourCC::Enumerate<BigDNA::ReadYaml>(typename ReadYaml::StreamT& r)
{ std::string rs = r.readString(nullptr); strncpy(fcc, rs.c_str(), 4); }
template <> inline void DNAFourCC::Enumerate<BigDNA::WriteYaml>(typename WriteYaml::StreamT& w)
{ w.writeString(nullptr, std::string(fcc, 4)); }
template <> inline void DNAFourCC::Enumerate<BigDNA::BinarySize>(typename BinarySize::StreamT& s)
{ s += 4; }

class DNAColor final : public BigDNA, public zeus::CColor
{
public:
    DNAColor() = default;
    DNAColor(const zeus::CColor& color) : zeus::CColor(color) {}
    AT_DECL_EXPLICIT_DNA_YAML
};
template <> inline void DNAColor::Enumerate<BigDNA::Read>(typename Read::StreamT& _r)
{ zeus::CColor::readRGBABig(_r); }
template <> inline void DNAColor::Enumerate<BigDNA::Write>(typename Write::StreamT& _w)
{ zeus::CColor::writeRGBABig(_w); }
template <> inline void DNAColor::Enumerate<BigDNA::ReadYaml>(typename ReadYaml::StreamT& _r)
{
    size_t count;
    if (auto v = _r.enterSubVector(nullptr, count))
    {
        r = (count >= 1) ? _r.readFloat(nullptr) : 0.f;
        g = (count >= 2) ? _r.readFloat(nullptr) : 0.f;
        b = (count >= 3) ? _r.readFloat(nullptr) : 0.f;
        a = (count >= 4) ? _r.readFloat(nullptr) : 0.f;
    }
}
template <> inline void DNAColor::Enumerate<BigDNA::WriteYaml>(typename WriteYaml::StreamT& _w)
{
    if (auto v = _w.enterSubVector(nullptr))
    {
        _w.writeFloat(nullptr, r);
        _w.writeFloat(nullptr, g);
        _w.writeFloat(nullptr, b);
        _w.writeFloat(nullptr, a);
    }
}
template <> inline void DNAColor::Enumerate<BigDNA::BinarySize>(typename BinarySize::StreamT& _s)
{ _s += 16; }

using FourCC = hecl::FourCC;
class UniqueID32;
class UniqueID64;
class UniqueID128;

/** Common virtual interface for runtime ambiguity resolution */
class PAKRouterBase
{
protected:
    const SpecBase& m_dataSpec;
public:
    PAKRouterBase(const SpecBase& dataSpec) : m_dataSpec(dataSpec) {}
    hecl::Database::Project& getProject() const {return m_dataSpec.getProject();}
    virtual hecl::ProjectPath getWorking(const UniqueID32&, bool silenceWarnings=false) const
    {
        LogDNACommon.report(logvisor::Fatal,
        "PAKRouter IDType mismatch; expected UniqueID32 specialization");
        return hecl::ProjectPath();
    }
    virtual hecl::ProjectPath getWorking(const UniqueID64&, bool silenceWarnings=false) const
    {
        LogDNACommon.report(logvisor::Fatal,
        "PAKRouter IDType mismatch; expected UniqueID64 specialization");
        return hecl::ProjectPath();
    }
    virtual hecl::ProjectPath getWorking(const UniqueID128&, bool silenceWarnings=false) const
    {
        LogDNACommon.report(logvisor::Fatal,
        "PAKRouter IDType mismatch; expected UniqueID128 specialization");
        return hecl::ProjectPath();
    }
};

/** Globally-accessed manager allowing UniqueID* classes to directly
 *  lookup destination paths of resources */
class UniqueIDBridge
{
    friend class UniqueID32;
    friend class UniqueID64;

    static ThreadLocalPtr<hecl::Database::Project> s_Project;
public:
    template <class IDType>
    static hecl::ProjectPath TranslatePakIdToPath(const IDType& id, bool silenceWarnings=false);
    template <class IDType>
    static hecl::ProjectPath MakePathFromString(std::string_view str);
    template <class IDType>
    static void TransformOldHashToNewHash(IDType& id);

    static void setThreadProject(hecl::Database::Project& project);
};

/** PAK 32-bit Unique ID */
class UniqueID32 : public BigDNA
{
protected:
    uint32_t m_id = 0xffffffff;
public:
    static UniqueID32 kInvalidId;
    AT_DECL_EXPLICIT_DNA_YAML
    operator bool() const {return m_id != 0xffffffff && m_id != 0;}
    void assign(uint32_t id) { m_id = id ? id : 0xffffffff; }

    UniqueID32& operator=(const hecl::ProjectPath& path)
    {assign(path.hash().val32()); return *this;}

    bool operator!=(const UniqueID32& other) const {return m_id != other.m_id;}
    bool operator==(const UniqueID32& other) const {return m_id == other.m_id;}
    bool operator<(const UniqueID32& other) const {return m_id < other.m_id;}
    uint32_t toUint32() const {return m_id;}
    uint64_t toUint64() const {return m_id;}
    std::string toString() const;
    void clear() {m_id = 0xffffffff;}

    UniqueID32() = default;
    UniqueID32(uint32_t idin) {assign(idin);}
    UniqueID32(athena::io::IStreamReader& reader) {read(reader);}
    UniqueID32(const hecl::ProjectPath& path) {*this = path;}
    UniqueID32(const char* hexStr)
    {
        char copy[9];
        strncpy(copy, hexStr, 8);
        copy[8] = '\0';
        assign(strtoul(copy, nullptr, 16));
    }
    UniqueID32(const wchar_t* hexStr)
    {
        wchar_t copy[9];
        wcsncpy(copy, hexStr, 8);
        copy[8] = L'\0';
        assign(wcstoul(copy, nullptr, 16));
    }

    static constexpr size_t BinarySize() {return 4;}
};

class AuxiliaryID32 : public UniqueID32
{
    const hecl::SystemChar* m_auxStr;
    const hecl::SystemChar* m_addExtension;
    UniqueID32 m_baseId;
public:
    AT_DECL_DNA
    Delete __d2;
    AuxiliaryID32(const hecl::SystemChar* auxStr,
                  const hecl::SystemChar* addExtension=nullptr)
    : m_auxStr(auxStr), m_addExtension(addExtension) {}

    AuxiliaryID32& operator=(const hecl::ProjectPath& path);
    AuxiliaryID32& operator=(const UniqueID32& id);
    const UniqueID32& getBaseId() const {return m_baseId;}
};

/** PAK 64-bit Unique ID */
class UniqueID64 : public BigDNA
{
    uint64_t m_id = 0xffffffffffffffff;
public:
    AT_DECL_EXPLICIT_DNA_YAML
    operator bool() const {return m_id != 0xffffffffffffffff && m_id != 0;}
    void assign(uint64_t id) { m_id = id ? id : 0xffffffffffffffff; }

    UniqueID64& operator=(const hecl::ProjectPath& path)
    {assign(path.hash().val64()); return *this;}

    bool operator!=(const UniqueID64& other) const {return m_id != other.m_id;}
    bool operator==(const UniqueID64& other) const {return m_id == other.m_id;}
    bool operator<(const UniqueID64& other) const {return m_id < other.m_id;}
    uint64_t toUint64() const {return m_id;}
    std::string toString() const;
    void clear() {m_id = 0xffffffffffffffff;}

    UniqueID64() = default;
    UniqueID64(uint64_t idin) {assign(idin);}
    UniqueID64(athena::io::IStreamReader& reader) {read(reader);}
    UniqueID64(const hecl::ProjectPath& path) {*this = path;}
    UniqueID64(const char* hexStr)
    {
        char copy[17];
        strncpy(copy, hexStr, 16);
        copy[16] = '\0';
#if _WIN32
        assign(_strtoui64(copy, nullptr, 16));
#else
        assign(strtouq(copy, nullptr, 16));
#endif
    }
    UniqueID64(const wchar_t* hexStr)
    {
        wchar_t copy[17];
        wcsncpy(copy, hexStr, 16);
        copy[16] = L'\0';
#if _WIN32
        assign(_wcstoui64(copy, nullptr, 16));
#else
        assign(wcstoull(copy, nullptr, 16));
#endif
    }

    static constexpr size_t BinarySize() {return 8;}
};

/** PAK 128-bit Unique ID */
class UniqueID128 : public BigDNA
{
    union
    {
        uint64_t m_id[2];
#if __SSE__
        __m128i m_id128;
#endif
    };
public:
    AT_DECL_EXPLICIT_DNA_YAML
    UniqueID128() {m_id[0]=0xffffffffffffffff; m_id[1]=0xffffffffffffffff;}
    operator bool() const
    {return m_id[0] != 0xffffffffffffffff && m_id[0] != 0 && m_id[1] != 0xffffffffffffffff && m_id[1] != 0;}

    UniqueID128& operator=(const hecl::ProjectPath& path)
    {
        m_id[0] = path.hash().val64();
        m_id[1] = 0;
        return *this;
    }
    UniqueID128(const hecl::ProjectPath& path) {*this = path;}

    bool operator!=(const UniqueID128& other) const
    {
#if __SSE__
        __m128i vcmp = _mm_cmpeq_epi32(m_id128, other.m_id128);
        int vmask = _mm_movemask_epi8(vcmp);
        return vmask != 0xffff;
#else
        return (m_id[0] != other.m_id[0]) || (m_id[1] != other.m_id[1]);
#endif
    }
    bool operator==(const UniqueID128& other) const
    {
#if __SSE__
        __m128i vcmp = _mm_cmpeq_epi32(m_id128, other.m_id128);
        int vmask = _mm_movemask_epi8(vcmp);
        return vmask == 0xffff;
#else
        return (m_id[0] == other.m_id[0]) && (m_id[1] == other.m_id[1]);
#endif
    }
    void clear() {m_id[0] = 0xffffffffffffffff; m_id[1] = 0xffffffffffffffff;}
    uint64_t toUint64() const {return m_id[0];}
    uint64_t toHighUint64() const {return m_id[0];}
    uint64_t toLowUint64() const {return m_id[1];}
    std::string toString() const;

    static constexpr size_t BinarySize() {return 16;}
};

/** Word Bitmap reader/writer */
class WordBitmap
{
    std::vector<atUint32> m_words;
    size_t m_bitCount = 0;
public:
    void read(athena::io::IStreamReader& reader, size_t bitCount);
    void write(athena::io::IStreamWriter& writer) const;
    void reserve(size_t bitCount) { m_words.reserve((bitCount + 31) / 32); }
    size_t binarySize(size_t __isz) const;
    size_t getBitCount() const {return m_bitCount;}
    bool getBit(size_t idx) const
    {
        size_t wordIdx = idx / 32;
        if (wordIdx >= m_words.size())
            return false;
        size_t wordCur = idx % 32;
        return (m_words[wordIdx] >> wordCur) & 0x1;
    }
    void setBit(size_t idx)
    {
        size_t wordIdx = idx / 32;
        while (wordIdx >= m_words.size())
            m_words.push_back(0);
        size_t wordCur = idx % 32;
        m_words[wordIdx] |= (1 << wordCur);
        m_bitCount = std::max(m_bitCount, idx + 1);
    }
    void unsetBit(size_t idx)
    {
        size_t wordIdx = idx / 32;
        while (wordIdx >= m_words.size())
            m_words.push_back(0);
        size_t wordCur = idx % 32;
        m_words[wordIdx] &= ~(1 << wordCur);
        m_bitCount = std::max(m_bitCount, idx + 1);
    }
    void clear() { m_words.clear(); m_bitCount = 0; }

    class Iterator
    {
        friend class WordBitmap;
        const WordBitmap& m_bmp;
        size_t m_idx = 0;
        Iterator(const WordBitmap& bmp, size_t idx) : m_bmp(bmp), m_idx(idx) {}
    public:
        using iterator_category = std::forward_iterator_tag;
        using value_type = bool;
        using difference_type = std::ptrdiff_t;
        using pointer = bool*;
        using reference = bool&;

        Iterator& operator++() {++m_idx; return *this;}
        bool operator*() {return m_bmp.getBit(m_idx);}
        bool operator!=(const Iterator& other) const {return m_idx != other.m_idx;}
    };
    Iterator begin() const {return Iterator(*this, 0);}
    Iterator end() const {return Iterator(*this, m_bitCount);}
};

/** Resource cooker function */
typedef std::function<bool(const hecl::ProjectPath&, const hecl::ProjectPath&)> ResCooker;

}

/* Hash template-specializations for UniqueID types */
namespace std
{
template<>
struct hash<DataSpec::DNAFourCC>
{
    size_t operator()(const DataSpec::DNAFourCC& fcc) const
    {return fcc.toUint32();}
};

template<>
struct hash<DataSpec::UniqueID32>
{
    size_t operator()(const DataSpec::UniqueID32& id) const
    {return id.toUint32();}
};

template<>
struct hash<DataSpec::UniqueID64>
{
    size_t operator()(const DataSpec::UniqueID64& id) const
    {return id.toUint64();}
};

template<>
struct hash<DataSpec::UniqueID128>
{
    size_t operator()(const DataSpec::UniqueID128& id) const
    {return id.toHighUint64() ^ id.toLowUint64();}
};
}

#endif // __DNA_COMMON_HPP__