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#pragma once
#include "cplt_fwd.hpp"
#include <json/reader.h>
#include <json/value.h>
#include <json/writer.h>
#include <tsl/array_map.h>
#include <cstddef>
#include <limits>
#include <stdexcept>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
template <class T>
class ItemList {
private:
std::vector<T> mStorage;
tsl::array_map<char, size_t> mNameLookup;
public:
template <class... Args>
T& Insert(std::string name, Args... args) {
auto iter = mNameLookup.find(name);
if (iter != mNameLookup.end()) {
throw std::runtime_error("Duplicate key.");
}
for (size_t i = 0; i < mStorage.size(); ++i) {
if (mStorage[i].IsInvalid()) {
mStorage[i] = T(*this, i, std::move(name), std::forward<Args>(args)...);
mNameLookup.insert(name, i);
return mStorage[i];
}
}
size_t id = mStorage.size();
mNameLookup.insert(name, id);
mStorage.emplace_back(*this, id, std::move(name), std::forward<Args>(args)...);
return mStorage[id];
}
void Remove(size_t index) {
auto& item = mStorage[index];
mNameLookup.erase(item.GetName());
mStorage[index] = T(*this);
}
T* Find(size_t id) {
return &mStorage[id];
}
const T* Find(size_t id) const {
return &mStorage[id];
}
const T* Find(std::string_view name) const {
auto iter = mNameLookup.find(name);
if (iter != mNameLookup.end()) {
return &mStorage[iter.value()];
} else {
return nullptr;
}
}
Json::Value Serialize() const {
Json::Value items(Json::arrayValue);
for (auto& item : mStorage) {
if (!item.IsInvalid()) {
auto elm = item.Serialize();
elm["Id"] = item.GetId();
elm["Name"] = item.GetName();
items.append(elm);
}
}
Json::Value root;
root["MaxItemId"] = mStorage.size();
root["Items"] = std::move(items);
return root;
}
ItemList() = default;
ItemList(const Json::Value& root) {
constexpr const char* kMessage = "Failed to load item list from JSON.";
auto& itemCount = root["MaxItemId"];
if (!itemCount.isIntegral()) throw std::runtime_error(kMessage);
mStorage.resize(itemCount.asInt64(), T(*this));
auto& items = root["Items"];
if (!items.isArray()) throw std::runtime_error(kMessage);
for (auto& elm : items) {
if (!elm.isObject()) throw std::runtime_error(kMessage);
auto& id = elm["Id"];
if (!id.isIntegral()) throw std::runtime_error(kMessage);
auto& name = elm["Name"];
if (!name.isString()) throw std::runtime_error(kMessage);
size_t iid = id.asInt64();
mStorage[iid] = T(*this, iid, name.asString());
mStorage[iid].Deserialize(elm);
}
}
typename decltype(mStorage)::iterator begin() {
return mStorage.begin();
}
typename decltype(mStorage)::iterator end() {
return mStorage.end();
}
typename decltype(mStorage)::const_iterator begin() const {
return mStorage.begin();
}
typename decltype(mStorage)::const_iterator end() const {
return mStorage.end();
}
private:
template <class TSelf>
friend class ItemBase;
void UpdateItemName(const T& item, const std::string& newName) {
mNameLookup.erase(item.GetName());
mNameLookup.insert(newName, item.GetId());
}
};
template <class TSelf>
class ItemBase {
private:
ItemList<TSelf>* mList;
size_t mId;
std::string mName;
public:
ItemBase(ItemList<TSelf>& list, size_t id = std::numeric_limits<size_t>::max(), std::string name = "")
: mList{ &list }
, mId{ id }
, mName{ std::move(name) } {
}
bool IsInvalid() const {
return mId == std::numeric_limits<size_t>::max();
}
ItemList<TSelf>& GetList() const {
return *mList;
}
size_t GetId() const {
return mId;
}
const std::string& GetName() const {
return mName;
}
void SetName(std::string name) {
mList->UpdateItemName(static_cast<TSelf&>(*this), name);
mName = std::move(name);
}
};
class ProductItem : public ItemBase<ProductItem> {
private:
std::string mDescription;
int mStock = 0;
public:
using ItemBase::ItemBase;
const std::string& GetDescription() const;
void SetDescription(std::string description);
int GetStock() const;
void SetStock(int stock);
Json::Value Serialize() const;
void Deserialize(const Json::Value& elm);
};
class FactoryItem : public ItemBase<FactoryItem> {
private:
std::string mDescription;
std::string mEmail;
public:
using ItemBase::ItemBase;
const std::string& GetDescription() const;
void SetDescription(std::string description);
const std::string& GetEmail() const;
void SetEmail(std::string email);
Json::Value Serialize() const;
void Deserialize(const Json::Value& elm);
};
class CustomerItem : public ItemBase<CustomerItem> {
private:
std::string mDescription;
std::string mEmail;
public:
using ItemBase::ItemBase;
const std::string& GetDescription() const;
void SetDescription(std::string description);
const std::string& GetEmail() const;
void SetEmail(std::string email);
Json::Value Serialize() const;
void Deserialize(const Json::Value& elm);
};
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