#pragma once

#include <cstdint>
#include <iterator>
#include <string>
#include <vector>

#include "adsDataCursor.h"

using adsDataCursor::DatatypeId;

class AdsVarData;

class AdsData
{
public:
    using SizeType = std::uint32_t;

    class SymbolInfo;
    class SubSymbolInfo;
    class DatatypeInfo;
    class ArrayInfo;

    class iterator;
    using const_iterator = iterator;

    AdsData() noexcept;
    AdsData(const std::vector<char>& symData, const std::vector<char>& dtData);

    AdsData(const AdsData&) = delete;
    AdsData& operator=(const AdsData&) = delete;

    AdsData(AdsData&&) noexcept;
    AdsData& operator=(AdsData&&) noexcept;

    ~AdsData() noexcept;

    AdsVarData maybe(std::string_view name) const;
    AdsVarData operator[](std::string_view name) const;

    iterator begin() const noexcept;
    iterator end() const noexcept;
    iterator cbegin() const noexcept;
    iterator cend() const noexcept;

private:
    std::vector<SymbolInfo>   symbols_;
    std::vector<DatatypeInfo> types_;
};

class AdsVarData
{
public:
    using SizeType = AdsData::SizeType;
    class iterator;
    using const_iterator = iterator;

    std::string        name(std::string prefix) const;
    std::string        shortName() const;
    const std::string& type() const noexcept;
    DatatypeId         typeId() const noexcept;
    SizeType           group() const noexcept;
    SizeType           offset() const noexcept;
    SizeType           size() const noexcept;

    bool isPointer() const noexcept;
    bool isReference() const noexcept;

    bool isStatic() const noexcept;

    bool empty() const noexcept;

    SizeType subElements() const noexcept;

    AdsVarData deref(SizeType address) const;

    AdsVarData maybe(std::string_view name) const;
    AdsVarData operator[](std::string_view name) const;

    iterator begin() const noexcept;
    iterator end() const noexcept;
    iterator cbegin() const noexcept;
    iterator cend() const noexcept;

    bool     good() const noexcept;
    explicit operator bool() const noexcept;

private:
    AdsVarData() noexcept;
    AdsVarData(const AdsData::SubSymbolInfo* info, SizeType group, SizeType offset, SizeType index);
    const AdsData::SubSymbolInfo* info_;
    SizeType                      group_;
    SizeType                      offset_;
    SizeType                      index_;

    friend class AdsData;
    friend class AdsData::iterator;
};

class AdsData::iterator
{
public:
    using value_type        = AdsVarData;
    using reference         = AdsVarData;
    using pointer           = AdsVarData;
    using difference_type   = std::ptrdiff_t;
    using iterator_category = std::input_iterator_tag;

    reference operator*() const noexcept;
    pointer   operator->() const noexcept;

    friend bool operator==(iterator lhs, iterator rhs) noexcept;
    friend bool operator!=(iterator lhs, iterator rhs) noexcept;

    iterator& operator++() noexcept;
    iterator  operator++(int) noexcept;

private:
    explicit iterator(std::vector<AdsData::SymbolInfo>::const_iterator it) noexcept;
    std::vector<AdsData::SymbolInfo>::const_iterator iter_;

    friend class AdsData;
};

class AdsVarData::iterator
{
public:
    using value_type        = AdsVarData;
    using reference         = AdsVarData;
    using pointer           = AdsVarData;
    using difference_type   = std::ptrdiff_t;
    using iterator_category = std::input_iterator_tag;

    reference operator*() const noexcept;
    pointer   operator->() const noexcept;

    friend bool operator==(const iterator& lhs, const iterator& rhs) noexcept;
    friend bool operator!=(const iterator& lhs, const iterator& rhs) noexcept;

    iterator& operator++() noexcept;
    iterator  operator++(int) noexcept;

private:
    explicit iterator(const AdsData::SubSymbolInfo* info, SizeType group, SizeType offset, SizeType index) noexcept;
    const AdsData::SubSymbolInfo* info_;
    SizeType                      group_;
    SizeType                      offset_;
    SizeType                      index_;

    friend class AdsVarData;
};