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#include <algorithm>
#include <cctype>
#include <functional>
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
#include <book_store/book.hh>
#include <book_store/book_count.hh>
#include <book_store/customer.hh>
#include <book_store/price.hh>
#include <book_store/purchase_error.hh>
#include <book_store/store.hh>
namespace book_store {
auto store::append_book(const product::book &book) -> void {
if (this->books_max_size() != 0 &&
this->_books.size() < this->books_max_size()) {
this->_books.push_back(book);
}
}
auto store::append_customer(const customer_type &person) -> void {
if (this->people_max_size() != 0 &&
this->_customers.size() < this->people_max_size()) {
this->_customers.push_back(person);
}
}
auto store::purchase_book(size_type person_id, std::string_view isbn,
product::book_count count)
-> std::optional<purchase_error> {
auto person = this->find_person_by_id(person_id);
if (!person) {
return purchase_error(
purchase_error::purchase_error_type::person_not_found);
}
auto book = this->find_book_by_isbn(isbn);
if (!book) {
return purchase_error(purchase_error::purchase_error_type::book_not_found);
}
if (book->get().copies() < count) {
return purchase_error(
purchase_error::purchase_error_type::not_enough_stock);
}
auto &customer = *person;
auto book_price = book.value().get().price_usd();
if (customer.is_member()) {
auto discount = 1.0 - (this->_membership_discount_percent * 0.01);
book_price =
static_cast<product::price::usd::price_type>(book_price * discount);
if (customer.books_bought() % 11 == 0) {
auto transaction_count = 0;
auto transaction_total = 0.0;
for (auto &transaction : this->_transactions) {
if (transaction.first == person_id) {
transaction_total += transaction.second.price_usd();
transaction_count += 1;
}
}
if (transaction_count >= 10) {
book_price = (transaction_total / transaction_count) * discount;
}
customer.amount_spent(0);
}
}
customer.books_bought(customer.books_bought() + count);
// There's some fun casting going on here. It's all safe, though ... probably.
customer.amount_spent(customer.amount_spent() +
static_cast<product::price::usd::price_type>(
(static_cast<product::book_count::book_count_type>(
book_price.value()) *
count.value())));
book.value().get().copies(book.value().get().copies() - count);
this->_transactions.emplace_back(
person_id, product::book{book.value().get().title().data(),
book.value().get().authors(),
book.value().get().publisher().data(),
book.value().get().isbn().data(), book_price,
product::book_count(count)});
return std::nullopt;
}
auto store::tick_year() -> void {
for (auto &customer : this->_customers) {
customer.amount_spent(customer.amount_spent() + this->_membership_fee);
}
}
auto store::membership_fee(product::price::usd fee) -> void {
this->_membership_fee = fee;
}
auto store::membership_discount_percent(discount_percent_type discount_percent)
-> void {
this->_membership_discount_percent = discount_percent;
}
auto store::books_max_size() const noexcept -> size_type {
return this->_books_max_size;
}
auto store::people_max_size() const noexcept -> size_type {
return this->_customers_max_size;
}
auto store::books_size() const noexcept -> size_type {
return this->_books.size();
}
auto store::people_size() const noexcept -> size_type {
return this->_customers.size();
}
auto store::membership_fee() const noexcept -> product::price::usd {
return this->_membership_fee;
}
auto store::membership_discount_percent() const noexcept
-> discount_percent_type {
return this->_membership_discount_percent;
}
auto store::find_person_by_id(size_type person_id)
-> std::optional<customer_type> {
for (auto &person : this->_customers) {
if (person.id() == person_id) {
return person;
}
}
return std::nullopt;
}
auto store::find_book_by_isbn(std::string_view isbn)
-> std::optional<std::reference_wrapper<product::book>> {
for (auto &book : this->_books) {
std::string book_isbn = book.isbn().data();
std::string search_isbn = isbn.data();
std::transform(
book_isbn.begin(), book_isbn.end(), book_isbn.begin(),
[](unsigned char character) { return std::tolower(character); });
std::transform(
search_isbn.begin(), search_isbn.end(), search_isbn.begin(),
[](unsigned char character) { return std::tolower(character); });
if (book_isbn == search_isbn) {
return book;
}
}
return std::nullopt;
}
auto store::find_books_by_title(std::string_view title)
-> std::vector<product::book> {
std::vector<product::book> books;
for (auto &book : this->_books) {
std::string book_title = book.title().data();
std::string search_title = title.data();
std::transform(
book_title.begin(), book_title.end(), book_title.begin(),
[](unsigned char character) { return std::tolower(character); });
std::transform(
search_title.begin(), search_title.end(), search_title.begin(),
[](unsigned char character) { return std::tolower(character); });
if (book_title.find(search_title) != std::string::npos) {
books.push_back(book);
}
}
return books;
}
auto store::find_books_by_author(std::string_view name)
-> std::vector<product::book> {
std::vector<product::book> books;
for (auto &book : this->_books) {
for (auto &author : book.authors()) {
std::string author_name = author.full_name();
std::string search_name = name.data();
std::transform(
author_name.begin(), author_name.end(), author_name.begin(),
[](unsigned char character) { return std::tolower(character); });
std::transform(
search_name.begin(), search_name.end(), search_name.begin(),
[](unsigned char character) { return std::tolower(character); });
if (author_name.find(search_name) != std::string::npos) {
books.push_back(book);
}
}
}
return books;
}
auto store::transactions_by_id(size_type person_id)
-> std::vector<product::book> {
std::vector<product::book> books;
for (auto &transaction : this->_transactions) {
if (transaction.first == person_id) {
books.push_back(transaction.second);
}
}
return books;
}
auto store::books() -> books_type & { return this->_books; }
auto store::people() -> customer_container & { return this->_customers; }
} // namespace book_store
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