from django.shortcuts import render,redirect

# Create your views here.

from .models import *

from django import forms
from django.forms import widgets



from django.forms import ModelForm

'''
class BookForm(forms.Form):
        # 原生form
        email=forms.EmailField()
        title = forms.CharField(max_length=32,label="書籍名稱")
        price = forms.DecimalField(max_digits=8, decimal_places=2,label="價格")  # 999999.99
        date = forms.DateField(label="日期",
            widget=widgets.TextInput(attrs={"type":"date"})
        )
        #gender=forms.ChoiceField(choices=((1,"男"),(2,"女"),(3,"其他")))
        #publish=forms.ChoiceField(choices=Publish.objects.all().values_list("pk","title"))
        publish=forms.ModelChoiceField(queryset=Publish.objects.all())  # select
        authors=forms.ModelMultipleChoiceField(queryset=Author.objects.all())  # select
 
'''

from django.forms import widgets as wid
class BookForm(ModelForm):
    class Meta:
        model=Book
        fields="__all__"  # 部分欄位寫列表
        labels={"title":"書籍名稱", "price":"價格"}  # 字典 指明欄位
        
        # 設定樣式
        widgets={
            "title":wid.TextInput(attrs={"class
 
":"form-control"}),
            "price":wid.TextInput(attrs={"class":"form-control"}),
            "date":wid.TextInput(attrs={"class":"form-control","type":"date"}),
            "publish":wid.Select(attrs={"class":"form-control"}),
            "authors":wid.SelectMultiple(attrs={"class":"form-control
 
"}),
        }
        # 錯誤資訊
        error_messages={
            "title":{"required":"不能為空"}
        }


def books(request):
    book_list=Book.objects.all()
    return render(request,"books.html",locals())


def addbook(request):
    if request.method=="POST":
        #  新增操作 create
        form = BookForm(request.POST)
        if form.is_valid():
            # 直接儲存資料 包括跨表操作都已完成
            form.save()    # form.model.objects.create(request.POST)
            return redirect("/books/")
        else:
            return render(request, "add.html", locals())
    form=BookForm()
    return render(request,"add.html",locals())


def editbook(request,edit_book_id):
    edit_book = Book.objects.filter(pk=edit_book_id).first()
    if request.method=="POST":
        # 修改操作 對instance 這個物件進行update
        form = BookForm(request.POST,instance=edit_book)
        if form.is_valid():
            form.save()  # edit_book.update(request.POST)
            return redirect("/books/")
    
    
    # get 請求同樣帶著資料過去
    # 引數為 instance 物件
    form=BookForm(instance=edit_book)
    return render(request,"edit.html",locals())

form.html

<div class="col-md-4 col-md-offset-2">
        <form action="" method="post" novalidate>
            {% csrf_token %}
            {% for field in form %}
                <div>
                    {{ field.label }}
                    {{ field }} <span class="has-error">{{ field.errors.0 }}</span>
                </div>
            {% endfor %}
            <input type="submit" class="pull-right btn-success btn">
        </form>
    </div>