import { book_item_data } from '../data/data';
import { config } from '../config/config';
import { util } from '../framework/util';

export class ReadHistoryManager {
    private static book_list:book_item_data[] = null
	private static max_count = 20

   // 获取书列表
	public static getBookList():book_item_data[] {
		if(ReadHistoryManager.book_list) {
			return ReadHistoryManager.book_list
		}
		ReadHistoryManager.book_list = []
		let string = util.getStorage(config.storage_key.READ_HISTORY)
		if(string) {
			ReadHistoryManager.book_list = JSON.parse(string)
		}
		return ReadHistoryManager.book_list
	}
	
	// 保存本地书列表
	private static saveLocalBookList() {
		util.setStorage(config.storage_key.READ_HISTORY, JSON.stringify(ReadHistoryManager.book_list))
	}

    // 检查在阅读历史
	public static async checkBookOnReadHistory(book_id:number, cb:Function) {
		let index = -1
		let book_item = null
		for (let i = 0; i < ReadHistoryManager.getBookList().length; i++) {
			let element = ReadHistoryManager.getBookList()[i]
			if(element.book_id == book_id) {
				index = i
				book_item = element
				break
			}
		}
		cb && cb(index,book_item)
	}
	
	// 添加书
	public static async addBook(book_data:book_item_data, cb:Function) {
		let read_hisroty_time = util.timeFormat(new Date().getTime())
		book_data.read_hisroty_time = read_hisroty_time
		
		ReadHistoryManager.checkBookOnReadHistory(book_data.book_id, (index:number)=>{
			if(index>-1) {
				ReadHistoryManager.getBookList().splice(index,1)
			} else {
				if(ReadHistoryManager.getBookList().length >= ReadHistoryManager.max_count) {
					ReadHistoryManager.getBookList().pop()
				}
			}
			ReadHistoryManager.getBookList().unshift(book_data)
			// console.log('Readhistory-getBookList()=',ReadHistoryManager.getBookList())
			ReadHistoryManager.saveLocalBookList()
			cb && cb()
		})
	}
	
	// 删除书
    public static deleteBook(book_id_list:number[]) {
		for (let i = 0; i < book_id_list.length; i++) {
			let element = book_id_list[i]
			for (let j = 0; j < ReadHistoryManager.getBookList().length; j++) {
				let j_element = ReadHistoryManager.getBookList()[j]
				if(element==j_element.book_id) {
					ReadHistoryManager.getBookList().splice(j,1)
				}
			}
		}
		ReadHistoryManager.saveLocalBookList()
	}
	
	// 重置数据
	public static resetData(book_list:book_item_data[]) {
		ReadHistoryManager.book_list = book_list
		ReadHistoryManager.saveLocalBookList()
	}

}