import traceback

from PyQt5.QtWidgets import QDialog, QCommandLinkButton, QListWidgetItem
from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt

from ui.welcome.recent_project import RecentProjectWidget
from ui.welcome.welcome_dialog_ui import Ui_WelcomeDialog

class WelcomeDialog(QDialog):
    NEW_PROJECT = 0
    OPEN_PROJECT = 1

    def __init__(self, projectManager):
        super().__init__()
        self.__projectManager = projectManager
        self.resultAction = None
        self.projectToOpen = None
        self.setResult(QDialog.Rejected)
        self.setupUi()
        self.setupActions()
        self.populateRecentProjects()

    def setupUi(self):
        self.ui = Ui_WelcomeDialog()
        self.ui.setupUi(self)
        self.image = QPixmap(self.ui.picture.pixmap())

    def setupActions(self):
        self.ui.buttonNewProject.pressed.connect(self.newProjectPressed)
        self.ui.buttonOpenProject.pressed.connect(self.openProjectPressed)
        self.ui.listRecentProjects.currentItemChanged.connect(self.listRecentProjectsCurrentChanged)
        self.ui.listRecentProjects.itemActivated.connect(self.listRecentProjectsItemActivated)

    def resizeEvent(self, event):
        super().resizeEvent(event)
        
        picSize = self.ui.picture.size()
        pic = self.image.scaled(picSize, Qt.KeepAspectRatioByExpanding, Qt.SmoothTransformation)
        self.ui.picture.setPixmap(pic)

    def populateRecentProjects(self):
        projects = list(self.__projectManager.getRecentProjects())
        projects = sorted(projects, key=lambda x: (x['pinned'], x['date']), reverse=True)
        
        for project in projects:

            widget = RecentProjectWidget(project)
            widget.pinned.connect(self.__projectPinned)
            widget.deleted.connect(self.__projectDeleted)

            item = QListWidgetItem(project['name'])
            item.setData(Qt.UserRole, project)
            item.setSizeHint(widget.sizeHint())

            self.ui.listRecentProjects.addItem(item)
            self.ui.listRecentProjects.setItemWidget(item, widget)

    def newProjectPressed(self):
        self.resultAction = WelcomeDialog.NEW_PROJECT
        self.accept()

    def openProjectPressed(self):
        # TODO: show open dialog
        self.resultAction = WelcomeDialog.OPEN_PROJECT
        self.accept()

    def listRecentProjectsCurrentChanged(self, current, previous):
        if not current is None:
            recentProjectWidget = self.ui.listRecentProjects.itemWidget(current)
            recentProjectWidget.setSelected(True)
            
        if not previous is None:
            recentProjectWidget = self.ui.listRecentProjects.itemWidget(previous)
            if not recentProjectWidget is None:
                recentProjectWidget.setSelected(False)

    def listRecentProjectsItemActivated(self, item):
        project = item.data(Qt.UserRole)
        self.resultAction = WelcomeDialog.OPEN_PROJECT
        self.projectToOpen = project['path']
        self.accept()

    def __projectPinned(self, isPinned):
        project = self.ui.listRecentProjects.currentItem().data(Qt.UserRole)
        self.__projectManager.pinRecentProject(project, isPinned)

    def __projectDeleted(self):
        project = self.ui.listRecentProjects.currentItem().data(Qt.UserRole)
        try:
            self.__projectManager.deleteRecentProject(project)
            self.ui.listRecentProjects.takeItem(self.ui.listRecentProjects.currentRow())
        except:
            print("Error while deleting! ")
            traceback.print_exc()