import xlwt
import xlrd


def read_old_data(row0_len):
    try:
        filename=".\圖書.xls"
        old_data = []#讀取表格已有內容
        data = xlrd.open_workbook(filename)
        sheet0 = data.sheet_by_index(0)
        nrows = sheet0.nrows  #獲取該sheet中的有效行數
        print("Info:讀取到已有數據表格")
        print("有效行數：",nrows)
        for i in range(nrows):
            for j in range(row0_len):
                old_data.append(sheet0.cell(i,j).value)
        print("共有舊的數據：",len(old_data))
    except IOError:
        print("Info: 沒有找到文件或讀取文件失敗/n1 =>新建圖書.xls文件")
        nrows=0
    return old_data,nrows

def new_book():

    book = []
    print_value=("書名","作者","編號","位置","數量")
    row0_len=len(print_value)#列數
    input_value=''
    '''
    try:

    '''
    (old_data,nrows)=read_old_data(row0_len)
    
    #打開存儲
    book_excel = xlwt.Workbook()
    sheet1 = book_excel.add_sheet("books",cell_overwrite_ok=0)

    #寫入舊數據：
    for i in range(nrows):
        for j in range(row0_len):
            sheet1.write(i,j,old_data[(i*row0_len)+j])

    while(1):
        print("添加新書")
        #輸入
        for i in range(row0_len):
            print("請輸入："+print_value[i])
            input_value = input()

            #判斷是否輸出
            if(input_value == 'q'):
                book_excel.save("圖書.xls")
                return
            book.append(input_value)
        #保存到硬盤
        for i in range(row0_len):
            sheet1.write(nrows,i,book[i])
        nrows=nrows+1
        book=[]#清空book緩存
    return


def search():
    #打開excel
    book_excel = xlrd.open_workbook("圖書.xls")
    sheet1 = book_excel.sheets()[0]
    book_num =sheet1.nrows
    #while(1):
    #輸入書名
    bookname = input("請輸入書名：")
    find_flag=0
    #查找
    for i in range(book_num):
        if(bookname == sheet1.cell_value(i,0)):
            if(int(sheet1.cell_value(i,4))>0):
                find_flag=1
                print("書名：",sheet1.cell_value(i,0))
                print("作者：",sheet1.cell_value(i,1))
                print("位置：",sheet1.cell_value(i,3))
                print("庫存（本）：",sheet1.cell_value(i,4))
                return
    if(find_flag==1):
        print("查無此書。")
    return

def borrow():
    #打開excel
    book_excel =xlrd.open_workbook("圖書.xls")
    sheet1 = book_excel.sheets()[0]
    book_num = sheet1.nrows
    row0_len=5#5列
    while(1):
        #輸入書名
        bookname = input("請輸入書名：")
        if(bookname == 'q'):
            return
        #查找
        for i in range(0,book_num):
            if(bookname == sheet1.cell(i,0).value):

                kucun=int(sheet1.cell_value(i,4))
                
                if(kucun>0):
                    (old_data,nrows)=read_old_data(row0_len)#5列
                    book_excel_w = xlwt.Workbook("圖書.xls")
                    sheet2 = book_excel_w.add_sheet("books",cell_overwrite_ok=True)
                    #寫入舊數據：
                    for n in range(nrows):
                        for j in range(row0_len):
                            sheet2.write(n,j,old_data[(n*row0_len)+j])
                    
                    print("借到了！")
                    sheet2.write(i,4,str(kucun-1))
                    print("剩余庫存：",kucun-1)
                    book_excel_w.save("圖書.xls")
                    break
    return


def main_window():
    while(1):
        print("\n====圖書管理系統====")
        print("1.新書加入")
        print("2.書籍查詢")
        print("3.圖書借閱")
        print("========4退出=======")
        x= (input("請輸入你的操作"))
        print('\n')
        if(x == '1'):
            new_book()
        elif(x=='2'):
            search()
        elif(x=='3'):
            borrow()
            
        elif(x=='4'):
            break
        else:
            print("輸入無效")

    return


main_window()