package store

import (
	mystore "awesomeProject/store"
	factory "awesomeProject/store/factory"
	"errors"
	"sync"
)

func init() {
	factory.Register("mem", &MemStore{
		books: make(map[string]*mystore.Book),
	})
}

type MemStore struct {
	sync.RWMutex
	books map[string]*mystore.Book
}

func (m *MemStore) Create(book *mystore.Book) error {
	if _, ok := m.books[book.Id]; ok {
		return errors.New("book is existed")
	}
	m.books[book.Id] = book
	return nil
}

func (m *MemStore) Update(book *mystore.Book) error {
	oldBook, ok := m.books[book.Id]
	if !ok {
		return errors.New("book not found")
	}
	oldBook.Name = book.Name
	oldBook.Authors = book.Authors
	oldBook.Press = book.Press
	return nil
}

func (m *MemStore) Get(s string) (mystore.Book, error) {
	oldBook, ok := m.books[s]
	if !ok {
		return mystore.Book{}, errors.New("book not found")
	} else {
		return *oldBook, nil
	}
}

func (m *MemStore) GetAll() ([]mystore.Book, error) {
	books := make([]mystore.Book, 0, len(m.books)) // 初始化切片，预分配容量
	for _, book := range m.books {
		books = append(books, *book) // 解引用并添加到切片中
	}
	return books, nil // 返回所有书籍
}

func (m *MemStore) Delete(s string) error {
	if _, ok := m.books[s]; !ok {
		return errors.New("book not found") // 如果书籍未找到，返回错误
	}
	delete(m.books, s) // 从 map 中删除书籍
	return nil         // 删除成功，返回 nil
}