package eu.dnetlib.uoaadmintools.services;

import eu.dnetlib.uoaadmintools.dao.MenuItemDAO;
import eu.dnetlib.uoaadmintools.entities.menu.MenuItem;
import eu.dnetlib.uoaadmintools.entities.menu.MenuItemFull;
import eu.dnetlib.uoaadmintoolslibrary.handlers.MismatchingContentException;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class MenuItemService {
    private final Logger log = Logger.getLogger(this.getClass());

    @Autowired
    private MenuItemDAO menuItemDAO;

    public MenuItem getMenuItem(String id) {
        return menuItemDAO.findById(id);
    }

    public MenuItemFull getMenuItemFull(String id) {
            return this.getMenuItemFull(id, 1);
    }

    public MenuItemFull getMenuItemFull(String id, int maxDepth) {
        MenuItem menuItem = menuItemDAO.findById(id);
        MenuItemFull menuItemFull = new MenuItemFull(menuItem);
        if(maxDepth == 0) {
            menuItemFull.setItems(new ArrayList<>());
            return menuItemFull;
        }

        List<MenuItemFull> menuItemsFull = new ArrayList<>();
        for(String menuItemString : menuItem.getItems()) {
            menuItemsFull.add(this.getMenuItemFull(menuItemString, maxDepth-1));
        }
        menuItemFull.setItems(menuItemsFull);

        return menuItemFull;
    }

    public List<MenuItem> getMenuItems(String portalPid) {
        if(portalPid != null) {
            return menuItemDAO.findByPortalPid(portalPid);
        } else {
            return menuItemDAO.findAll();
        }
    }

    public List<MenuItem> getMenuItemsByParent(String parentId, String portalPid) {
        if(portalPid != null) {
            return menuItemDAO.findByParentItemIdAndPortalPid(parentId, portalPid);
        } else {
            return menuItemDAO.findByParentItemId(parentId);
        }
    }

    public List<MenuItemFull> getRootMenuItemsFull(String portalPid) {
        List<MenuItem> rootMenuItems = this.getMenuItemsByParent(null, portalPid);
        List<MenuItemFull> rootMenuItemsFull = new ArrayList<>();
        for(MenuItem rootMenuItem : rootMenuItems) {
            MenuItemFull rootMenuItemFull = new MenuItemFull(rootMenuItem);

            List<MenuItemFull> childrenMenuItemsFull = new ArrayList<>();
            for(String childMenuItemString : rootMenuItem.getItems()) {
                childrenMenuItemsFull.add(this.getMenuItemFull(childMenuItemString));
            }
            rootMenuItemFull.setItems(childrenMenuItemsFull);
            rootMenuItemsFull.add(rootMenuItemFull);
        }

        return rootMenuItemsFull;
    }

//    public MenuItemFull saveAndReturn(MenuItemFull menuItemFull) {
//        menuItemFull.setId(save(menuItemFull));
//        return menuItemFull;
//    }

    public MenuItemFull insertMenuItem(MenuItem menuItem, String portalPid) {
//        for(MenuItemFull childMenuItemFull : menuItemFull.getItems()) {
//            childMenuItemFull.setId(this.save(childMenuItemFull));
//        }

//        MenuItem menuItem = getMenuItemByMenuItemFull(menuItemFull);
//        menuItemDAO.save(menuItem);
//
//        return menuItem.getId();

        MenuItem parent = null;
        if(menuItem.getParentItemId() != null && !menuItem.getParentItemId().equals("")) {
            parent = getMenuItem(menuItem.getParentItemId());
            if (!parent.getPortalPid().equals(portalPid)) {
                // EXCEPTION - MismatchingContent
                throw new MismatchingContentException("insertMenuItem: parent ("+parent.getParentItemId()+") of MenuItem has portalPid: " + parent.getPortalPid() + " instead of " + portalPid);
            }
        } else {
            menuItem.setParentItemId(null);
        }

//        MenuItem menuItem = getMenuItemByMenuItemFull(menuItemFull);
        if(menuItem.getItems() == null) {
            List<String> menuItems = new ArrayList<String>();
            menuItem.setItems(menuItems);
        }
        menuItemDAO.save(menuItem);

        if(parent != null) {
            List<String> siblingsOfNew = parent.getItems();
            siblingsOfNew.add(menuItem.getId());
            parent.setItems(siblingsOfNew);
            menuItemDAO.save(parent);
        }

        MenuItemFull menuItemFull  = new MenuItemFull(menuItem);
        menuItemFull.setItems(new ArrayList<>());

        return menuItemFull;
    }

    public MenuItemFull updateMenuItem(MenuItemFull menuItemFull) {
        MenuItem menuItem = getMenuItemByMenuItemFull(menuItemFull);

        // Update should not affect parent or children - only basic info can be updated
        MenuItem oldMenuItem = getMenuItem(menuItemFull.getId());
        menuItem.setItems(oldMenuItem.getItems());
        menuItem.setParentItemId(oldMenuItem.getParentItemId());

        menuItemDAO.save(menuItem);
        menuItemFull = getMenuItemFull(menuItem.getId());

        return menuItemFull;
    }

    public Boolean deleteMenuItem(String id, String portalPid) throws Exception {
//        menuItemDAO.delete(id);
        log.debug("delete menu item; "+id);
        List<String> menuItems = new ArrayList<>();
        menuItems.add(id);
        return deleteMenuItems(menuItems, portalPid);
    }

    public Boolean deleteMenuItems(List<String> menuItems, String portalPid) throws Exception {
        if(menuItems == null) {
            return true;
        }
        for (String id: menuItems) {
            MenuItem menuItem = menuItemDAO.findById(id);

            if(!portalPid.equals(menuItem.getPortalPid())) {
                // EXCEPTION - MismatchingContent
                throw new MismatchingContentException("Delete Menu Items: MenuItem with id: "+id+" has portalPid: "+menuItem.getPortalPid()+" instead of "+portalPid);
            }

            deleteMenuItems(menuItem.getItems(), portalPid);

            if(menuItem.getParentItemId() != null && !menuItem.getParentItemId().equals("")) {
                MenuItem parent = menuItemDAO.findById(menuItem.getParentItemId());
                List<String> siblingsOfDeleted = parent.getItems();
                siblingsOfDeleted.remove(id);
                parent.setItems(siblingsOfDeleted);
                menuItemDAO.save(parent);
            }

            menuItemDAO.delete(id);
        }

        return true;
    }


    private MenuItem getMenuItemByMenuItemFull(MenuItemFull menuItemFull) {
        MenuItem menuItem = new MenuItem();
        menuItem.setId(menuItemFull.getId());
        menuItem.setTitle(menuItemFull.getTitle());
        menuItem.setUrl(menuItemFull.getUrl());
        menuItem.setType(menuItemFull.getType());
        menuItem.setRoute(menuItemFull.getRoute());
        menuItem.setPortalPid(menuItemFull.getPortalPid());
        menuItem.setParentItemId(menuItemFull.getParentItemId());

        List<MenuItemFull> menuItemsFull = menuItemFull.getItems();
        List<String> menuItems = new ArrayList<String>();
        if(menuItemsFull != null) {
            for (MenuItemFull childMenuItemFull : menuItemsFull) {
                menuItems.add(childMenuItemFull.getId());
            }
        }
        menuItem.setItems(menuItems);

        return menuItem;
    }
}