import traceback

from PyQt5.QtWidgets import QDialog, QCommandLinkButton, QListWidgetItem, QFileDialog, QWidget, QHBoxLayout, QLabel, QToolButton, QLayout
from PyQt5.QtGui import QPixmap, QResizeEvent, QFont
from PyQt5.QtCore import Qt, pyqtSignal

from ui.welcome.welcome_dialog_ui import Ui_WelcomeDialog
from model import RecentProject
from business import ProjectManager
from properties.config import PROJECT_EXTENSION


class RecentProjectListWidget(QWidget):
    
    deleted = pyqtSignal()
    pinned = pyqtSignal(bool)

    def __init__(self, recentProject : RecentProject):
        super().__init__()
        self.project = recentProject
        self.__selected = False
        self.setupUi()
        self.setupActions()
        self.__setProject(recentProject)
        self.setSelected(False)

    def setupUi(self):
        layout = QHBoxLayout()

        # label
        self.__text = QLabel()
        layout.addWidget(self.__text)

        # space
        layout.addStretch()

        # pin button
        self.__pin_button = QToolButton()
        self.__pin_button.setFont(QFont("Font Awesome 5 Free"))
        self.__pin_button.setText("\uf08d")
        self.__pin_button.setCheckable(True)
        layout.addWidget(self.__pin_button)

        # delete button
        self.__del_button = QToolButton()
        self.__del_button.setFont(QFont("Font Awesome 5 Free"))
        self.__del_button.setText("\uf2ed")
        layout.addWidget(self.__del_button)

        # pin indicator
        self.__pin_indicator = QLabel()
        self.__pin_indicator.setFont(QFont("Font Awesome 5 Free"))
        self.__pin_indicator.setText("\uf08d")
        layout.addWidget(self.__pin_indicator)

        # done
        layout.setSizeConstraint(QLayout.SetMinimumSize)
        self.setLayout(layout)

    def setupActions(self):
        self.__pin_button.toggled.connect(self.__pinnedToggled)
        self.__del_button.pressed.connect(self.deleted)
        
    def setSelected(self, selected : bool = True):
        self.__selected = selected
        self.__pin_button.setVisible(selected)
        self.__del_button.setVisible(selected)
        self.__pin_indicator.setVisible(not self.__selected and self.__pin_button.isChecked())

    def setPinned(self, isPinned : bool = True):
        self.__pin_button.setChecked(isPinned)

    def __setProject(self, project : RecentProject):
        self.__text = project.name
        self.setPinned(project.pinned)

    def __pinnedToggled(self, isPinned : bool):
        self.__pin_indicator.setVisible(not self.__selected and isPinned)
        if (isPinned != self.project.pinned):
            self.pinned.emit(isPinned)


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

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

    def setupUi(self) -> None:
        self.ui = Ui_WelcomeDialog()
        self.ui.setupUi(self)
        self.image = QPixmap(self.ui.picture.pixmap())

    def setupActions(self) -> None:
        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 : QResizeEvent) -> None:
        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) -> None:
        projects = list(self.__projectManager.getRecentProjects())
        projects = sorted(projects, key=lambda x: (x.pinned, x.dateAccessed), reverse=True)
        
        for project in projects:

            widget = RecentProjectListWidget(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) -> None:
        self.resultAction = WelcomeDialog.NEW_PROJECT
        self.accept()

    def openProjectPressed(self) -> None:
        proj = QFileDialog.getOpenFileName(
            self, 
            self.tr('Open project'), 
            '', 
            self.tr(f'Project files (*.{PROJECT_EXTENSION});;All files (*.*)'))

        if proj[0]:
            self.projectToOpen = proj[0]
            self.resultAction = WelcomeDialog.OPEN_PROJECT
            self.accept()

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

    def listRecentProjectsItemActivated(self, item : QListWidgetItem) -> None:
        project : RecentProject = item.data(Qt.UserRole)
        self.resultAction = WelcomeDialog.OPEN_PROJECT
        self.projectToOpen = project.path
        self.accept()

    def __projectPinned(self, isPinned : bool) -> None:
        project = self.ui.listRecentProjects.currentItem().data(Qt.UserRole)
        self.__projectManager.pinRecentProject(project, isPinned)

    def __projectDeleted(self) -> None:
        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()