#!/usr/bin/env python

"""NewProjectWizard:  Wizard to create new projects."""

import os

from PyQt5 import QtWidgets, QtGui


class NewProjectWizard(QtWidgets.QWizard):
    def _get_project_config(self):
        return self._project_config

    project_config = property(_get_project_config)

    def _get_project_root(self):
        return self._project_root

    project_root = property(_get_project_root)

    def __init__(self, parent=None):
        self._project_config = None
        self._project_root = None
        QtWidgets.QWizard.__init__(self, parent=parent)

        self.addPage(IntroductionPage(self))
        self.addPage(ProjectFolderPage(self))
        self.addPage(ModelPage(self))
        self.addPage(DonePage(self))

        self.setPixmap(QtWidgets.QWizard.LogoPixmap, QtGui.QPixmap(':/icons/banner.jpg'))
        self.setWindowTitle('New Project')


# (0) Introduction
class IntroductionPage(QtWidgets.QWizardPage):
    def __init__(self, parent=None):
        QtWidgets.QWizardPage.__init__(self, parent=parent)

        self.setTitle('Introduction')
        self.setPixmap(QtWidgets.QWizard.WatermarkPixmap, QtGui.QPixmap(':/icons/banner.jpg'))

        label = QtWidgets.QLabel('This wizard will create a new project. Please verify that the '
                                 'following prerequisites are available to you: <ul>'
                                 '<li>Carpe Simiam Model Distribution v1.0</li></ul>')
        label.setWordWrap(True)

        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(label)

        self.setLayout(layout)


# (1) Project Folder
class ProjectFolderPage(QtWidgets.QWizardPage):
    def __init__(self, parent=None):
        QtWidgets.QWizardPage.__init__(self, parent=parent)

        self._valid = False

        self.setTitle('Project Details')
        self.setSubTitle('')

        projectNameLabel = QtWidgets.QLabel("Project name:")
        projectNameLineEdit = QtWidgets.QLineEdit()
        projectNameLabel.setBuddy(projectNameLineEdit)

        projectDescriptionLabel = QtWidgets.QLabel("Project description:")
        projectDescriptionLineEdit = QtWidgets.QLineEdit()
        projectDescriptionLabel.setBuddy(projectDescriptionLineEdit)

        projectFolderLabel = QtWidgets.QLabel("Project folder:")
        self.projectFolderLineEdit = QtWidgets.QLineEdit()
        projectFolderLabel.setBuddy(self.projectFolderLineEdit)
        self.validationLabel = QtWidgets.QLabel()
        self.validationLabel.setStyleSheet("QLabel{ color: red }")

        projectFolderButton = QtWidgets.QPushButton("Browse...")
        projectFolderButton.clicked.connect(self.onProjectFolderBrowse)
        self.projectFolderLineEdit.textChanged.connect(self.onProjectFolderChanged)

        layout = QtWidgets.QVBoxLayout()
        folderLine = QtWidgets.QHBoxLayout()

        layout.addWidget(projectNameLabel)
        layout.addWidget(projectNameLineEdit)
        layout.addWidget(projectDescriptionLabel)
        layout.addWidget(projectDescriptionLineEdit)

        layout.addWidget(projectFolderLabel)
        layout.addLayout(folderLine)
        layout.addWidget(self.validationLabel)
        folderLine.addWidget(self.projectFolderLineEdit)
        folderLine.addWidget(projectFolderButton)

        self.setLayout(layout)
        self.registerField("projectFolder*", self.projectFolderLineEdit)
        self.registerField("projectName*", projectNameLineEdit)
        self.registerField("projectDescription", projectDescriptionLineEdit)

    def onProjectFolderBrowse(self):
        selection = QtWidgets.QFileDialog.getExistingDirectory(self, 'Select Project Folder')
        if len(selection) > 0:
            self.projectFolderLineEdit.setText(selection)

    def onProjectFolderChanged(self):
        def validate(text):
            if len(text) == 0:
                return 'Please enter a valid destination for your project.'
            elif not os.path.exists(text):
                return 'The specified folder does not exist.'
            elif len(os.listdir(text)) > 0:
                return 'The specified folder is not empty.'
            return None

        result = validate(self.projectFolderLineEdit.text())
        self._valid = result is None
        if result is not None:
            self.validationLabel.setText(str(result))
        else:
            self.validationLabel.setText('')

    def validatePage(self):
        self.onProjectFolderChanged()
        return self._valid and QtWidgets.QWizardPage.validatePage(self)


# (2) Model Distribution
class ModelPage(QtWidgets.QWizardPage):
    def __init__(self, parent=None):
        QtWidgets.QWizardPage.__init__(self, parent=parent)
        self._valid = False

        self.setTitle("Model Distribution")
        self.setSubTitle("Specify the folder where the Carpe Simiam Model Distribution v1.0 is located.")

        # self.setCommitPage(True)

        modelFolderLabel = QtWidgets.QLabel("Model distribution folder:")
        modelFolderLineEdit = QtWidgets.QLineEdit()
        modelFolderLabel.setBuddy(modelFolderLineEdit)
        validationLabel = QtWidgets.QLabel("")
        validationLabel.setStyleSheet("QLabel{ color: red }")

        modelFolderButton = QtWidgets.QPushButton("Browse...")
        modelFolderButton.clicked.connect(self.onModelFolderBrowse)
        modelFolderLineEdit.textChanged.connect(self.onModelFolderChanged)

        layout = QtWidgets.QVBoxLayout()
        folderLine = QtWidgets.QHBoxLayout()
        layout.addWidget(modelFolderLabel)
        layout.addLayout(folderLine)
        layout.addWidget(validationLabel)
        folderLine.addWidget(modelFolderLineEdit)
        folderLine.addWidget(modelFolderButton)

        self.setLayout(layout)
        self.registerField("modelFolder*", modelFolderLineEdit)

        self.modelFolderLineEdit = modelFolderLineEdit
        self.validationLabel = validationLabel

    def onModelFolderBrowse(self):
        selection = QtWidgets.QFileDialog.getExistingDirectory(self, 'Select Model Distribution Folder')
        if len(selection) > 0:
            self.modelFolderLineEdit.setText(selection)

    def onModelFolderChanged(self):
        def validate(text):
            if len(text) == 0:
                return 'Please enter a valid model distribution location.'
            if not os.path.exists(text):
                return 'The specified folder does not exist.'
            if "distribution.json" not in os.listdir(text):
                return 'The specified folder does not contain a model distribution'
            return None

        result = validate(self.modelFolderLineEdit.text())
        self._valid = result is None
        if result is not None:
            self.validationLabel.setText(str(result))
        else:
            self.validationLabel.setText('')

    def validatePage(self):
        return self._valid and QtWidgets.QWizardPage.validatePage(self)


# (4) Done
class DonePage(QtWidgets.QWizardPage):
    def initializePage(self):
        # Collect fields
        w = self.wizard()
        w._project_config = {
            'description': self.field('projectDescription'),
            'name': self.field('projectName'),
            'pipeline': {
                'model-distribution': self.field('modelFolder')
            }
        }
        w._project_root = self.field('projectFolder')

        # TODO insert summary of project here
        done_message = "" \
                       "<p>You can now take the following steps to get started:" \
                       "<ul><li>Add individuals to the population. To do this, " \
                       "select <em>Data</em> &gt; <em>Manage Individuals...</em></li>" \
                       "<li>Import labeled data for training. Choose the appropriate " \
                       "entry from the <em>Data</em> menu.</li>" \
                       "<li>Run prediction on images using the <em>Predict Images...</em> button.</li>" \
                       "</ul></p><p>Configuration:<br>" + str(w._project_config) + "</p>"

        self.doneLabel.setText(done_message)

    def __init__(self, parent=None):
        QtWidgets.QWizardPage.__init__(self, parent=parent)

        self.doneLabel = QtWidgets.QLabel('Done.')
        self.doneLabel.setWordWrap(True)

        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(self.doneLabel)

        self.setLayout(layout)