import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk
from newlensdialog import NewlensDialog

pages = {}

class Notebook:
    __instance = None
    def __new__(cls, *args, **kwargs):
        if (cls.__instance is None):
            cls.__instance = super(Notebook, cls).__new__(cls)
        return cls.__instance
    
    def __init__(self, builder, db):
        self.builder = builder
        self.db = db
        self.nb = self.builder.get_object("lens_maker_notebook")

    def setDB(self, db):
        self.db = db

    def addPage(self, name):
        if pages.get(name) is not None:
            raise Exception("{page}: Page exists".format(page = name))
        label = Gtk.Label()
        label.set_text(name)
        liststore = Gtk.ListStore(int, str, str, int)
        treeview = Gtk.TreeView()
        treeview.connect("row-activated", self.on_row_activated)
        treeview.set_model(liststore)
        for i,  title in enumerate(["Serial No", "Lens", "Notes"]):
            renderer = Gtk.CellRendererText()
            column = Gtk.TreeViewColumn(title, renderer, text=i)
            treeview.append_column(column)
        scrollable_treelist = Gtk.ScrolledWindow()
        scrollable_treelist.set_vexpand(True)
        scrollable_treelist.add(treeview)
        index = self.nb.append_page(scrollable_treelist, label)
        if index < 0:
            raise Exception("{page}: Page not added".format(page = name))
        if self.db is not None:
            self.db.addMaker(name)
        pages[name] = liststore
        self.nb.show_all()
        
    def addRow(self, tab, tuple):
        page = pages.get(tab)
        if page is None:
            raise Exception("{name}: Page does not exist".format(name = tab))
        try:
            if self.db is not None:
                id = self.db.addLens(tab, tuple)
                page.append(tuple + (id, ))
            else:
                page.append(tuple)
        except Exception as err:
            print(err)
            raise

    def updateRow(self, path, tuple):
        try:
            model = path[0]
            row = path[1]
            for i in range(0, len(tuple)):
                model[row][i] = tuple[i]
            if self.db is not None:
                self.db.updateLens(tuple)
        except Exception as err:
            print(err)
            raise
            
    def deleteRow(self, path, id):
        try:
            model = path[0]
            iter = model.get_iter(path[1])
            model.remove(iter)
            if self.db is not None:
                self.db.deleteLens(id)
        except Exception as err:
            print(err)
            raise

    def deletePage(self, pagenum):
        self.nb.remove_page(pagenum)
    
    def getCurrentPage(self):
        return self.nb.get_current_page()
        
    def getCurrentPageLabel(self):
        page = self.nb.get_nth_page(self.getCurrentPage())
        label = self.nb.get_tab_label_text(page)
        return label

    def on_row_activated(self, widget, row, col):
        model = widget.get_model()
        lensdata = []
        for i in range(0, 4):
            lensdata.append(model[row][i])
        lensDialog = NewlensDialog(self.builder, self.db, (model, row))
        lensDialog.setText(lensdata)