package org.springside.bookstore.admin.web;

import org.extremecomponents.table.limit.Limit;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.util.WebUtils;
import org.springside.bookstore.admin.manager.BookManager;
import org.springside.bookstore.commons.domain.Book;
import org.springside.core.commons.BaseManageController;
import org.springside.core.commons.support.page.Page;
import org.springside.plugins.extremeTable.ExtremeTablePage;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;

/**
 * 图书管理的CRUD Controller.
 * 继承于对CRUD流程作了一定封装的{@link BaseManageController}，
 * 更灵活的MultiActionController请见继承于{@link org.springside.core.commons.BaseController}的BookStoreController和CustomerController
 *
 * @author Water Ye
 * @author Calvin
 * @author Kevin
 * @see BaseManageController
 * @see org.springside.core.commons.BaseController
 */
public class BookManageController extends BaseManageController {
    private BookManager bookManager;

    private static final int defaultPageSize = 3;
    protected static final String UPLOAD_DIR = "/images/book";

    //view 定义
    {
        listView = "/admin/book/listBook.jsp";
        editView = "/admin/book/editBook.jsp";
        successView = "redirect:/admin/book.do";
    }

    public void setBookManager(BookManager bookManager) {
        this.bookManager = bookManager;
    }

    /**
     * 回调函数，列出所有图书.
     * 采用extable的limit分页功能
     *
     * @see BaseManageController#list(HttpServletRequest, HttpServletResponse)
     */
    protected void onList(HttpServletRequest request,
                          HttpServletResponse response, ModelAndView mav) throws Exception {
        Limit limit = ExtremeTablePage.getLimit(request, defaultPageSize);
        Page page = bookManager.findBy(null, ExtremeTablePage.getSort(limit), limit.getPage(), limit.getCurrentRowsDisplayed());
        mav.addObject("books", page.getResult());
        mav.addObject("totalRows", page.getTotalCount());
    }

    /**
     * 回调函数，显示编辑图书界面.
     *
     * @see BaseManageController#edit(HttpServletRequest, HttpServletResponse)
     */
    protected void onEdit(HttpServletRequest request,
                          HttpServletResponse response, ModelAndView mav) throws Exception {
        Integer id = new Integer(request.getParameter("id"));
        mav.addObject(bookManager.get(id));
    }

    /**
     * 回调函数,保存图书.
     *
     * @param isNew 是否新增图书
     * @see BaseManageController#save(HttpServletRequest, HttpServletResponse)
     */
    protected void onSave(HttpServletRequest request,
                          HttpServletResponse response, ModelAndView mav, boolean isNew)
            throws Exception {
        Book book = null;

        if (isNew)
            book = new Book();
        else {
            Integer id = new Integer(request.getParameter("id"));
            book = bookManager.get(id);
        }

        BindingResult result = bindObject(request, book);
        if (bookManager.isNotUnique(book, "name"))
            result.reject(null, "书名不允许存在相同,请重新输入!");
        if (result.hasErrors()) {
            onBindError(request, result, mav, editView + "?method="
                    + (isNew ? "create" : "update"));
            return;
        }

        bookManager.save(book);
        saveMessage(request, "数据" + (isNew ? "新增" : "保存") + "成功!");
    }

    /**
     * 回调函数,查询图书.
     *
     * @see BaseManageController#query(HttpServletRequest, HttpServletResponse)
     */
    protected void onQuery(HttpServletRequest request,
                           HttpServletResponse response, ModelAndView mav) throws Exception {

        Limit limit = ExtremeTablePage.getLimit(request, defaultPageSize);
        Map filterMap = WebUtils.getParametersStartingWith(request, "search_");
        Page page = bookManager.findBy(filterMap, ExtremeTablePage.getSort(limit), limit.getPage(), limit.getCurrentRowsDisplayed());
        mav.addObject("books", page.getResult());
        mav.addObject("totalRows", page.getTotalCount());
    }

    /**
     * 回调函数,删除被选择的图书.
     *
     * @see BaseManageController#removeSelected(HttpServletRequest, HttpServletResponse)
     */
    protected void onRemoveSelected(HttpServletRequest request,
                                    HttpServletResponse response, ModelAndView mav) throws Exception {
        String[] ids = request.getParameterValues("itemlist");
        int success = 0;
        if (ids != null) {
            for (String id : ids) {
                try {
                    bookManager.removeById(new Integer(id));
                    success++;
                }
                catch (DataIntegrityViolationException e) {
                    saveMessage(request, "〈" + bookManager.get(new Integer(id)).getName() + "〉与其他数据关联，删除失败");
                }
            }
            saveMessage(request, "成功删除" + success + "条纪录!");
        }
    }

    /**
     * @see BaseManageController#referenceData(HttpServletRequest)
     */
    protected void referenceData(HttpServletRequest request, Map model) {
        model.put("categorys", bookManager.getAllCategorys());
    }

    /**
     * 预绑定,绑定Binder不能自动绑定的类别和图片信息.
     *
     * @see BaseManageController#preBind(HttpServletRequest, Object, ServletRequestDataBinder)
     */
    protected void preBind(HttpServletRequest request, Object object, ServletRequestDataBinder binder)
            throws IOException {
        binder.setDisallowedFields(new String[]{"image", "category"});

        Book book = (Book) object;

        //封面图片
        String fileName = uploadImageToFile(request, UPLOAD_DIR, "image");
        if (fileName != null)
            book.setImage(fileName);

        //图书分类
        Integer category_id = new Integer(request.getParameter("category.id"));
        book.setCategory(bookManager.getCategory(category_id));
    }
}