from PIL import Image, ImageDraw, ImageEnhance
from PyQt5 import QtGui, QtCore, QtWidgets
import os

from component import Component
from toolkit.frame import BlankFrame


class Component(Component):
    name = 'Image'
    version = '1.0.1'

    def widget(self, *args):
        super().widget(*args)
        self.page.pushButton_image.clicked.connect(self.pickImage)
        self.trackWidgets({
            'imagePath': self.page.lineEdit_image,
            'scale': self.page.spinBox_scale,
            'stretchScale': self.page.spinBox_scale_stretch,
            'rotate': self.page.spinBox_rotate,
            'color': self.page.spinBox_color,
            'xPosition': self.page.spinBox_x,
            'yPosition': self.page.spinBox_y,
            'stretched': self.page.checkBox_stretch,
            'mirror': self.page.checkBox_mirror,
        }, presetNames={
            'imagePath': 'image',
            'xPosition': 'x',
            'yPosition': 'y',
        }, relativeWidgets=[
            'xPosition', 'yPosition', 'scale'
        ])

    def previewRender(self):
        return self.drawFrame(self.width, self.height)

    def properties(self):
        props = ['static']
        if not os.path.exists(self.imagePath):
            props.append('error')
        return props

    def error(self):
        if not self.imagePath:
            return "There is no image selected."
        if not os.path.exists(self.imagePath):
            return "The image selected does not exist!"

    def frameRender(self, frameNo):
        return self.drawFrame(self.width, self.height)

    def drawFrame(self, width, height):
        frame = BlankFrame(width, height)
        if self.imagePath and os.path.exists(self.imagePath):
            scale = self.scale if not self.stretched else self.stretchScale
            image = Image.open(self.imagePath)

            # Modify image's appearance
            if self.color != 100:
                image = ImageEnhance.Color(image).enhance(
                    float(self.color / 100)
                )
            if self.mirror:
                image = image.transpose(Image.FLIP_LEFT_RIGHT)
            if self.stretched and image.size != (width, height):
                image = image.resize((width, height), Image.ANTIALIAS)
            if scale != 100:
                newHeight = int((image.height / 100) * scale)
                newWidth = int((image.width / 100) * scale)
                image = image.resize((newWidth, newHeight), Image.ANTIALIAS)

            # Paste image at correct position
            frame.paste(image, box=(self.xPosition, self.yPosition))
            if self.rotate != 0:
                frame = frame.rotate(self.rotate)

        return frame

    def pickImage(self):
        imgDir = self.settings.value("componentDir", os.path.expanduser("~"))
        filename, _ = QtWidgets.QFileDialog.getOpenFileName(
            self.page, "Choose Image", imgDir,
            "Image Files (%s)" % " ".join(self.core.imageFormats))
        if filename:
            self.settings.setValue("componentDir", os.path.dirname(filename))
            self.page.lineEdit_image.setText(filename)

    def command(self, arg):
        if '=' in arg:
            key, arg = arg.split('=', 1)
            if key == 'path' and os.path.exists(arg):
                try:
                    Image.open(arg)
                    self.page.lineEdit_image.setText(arg)
                    self.page.checkBox_stretch.setChecked(True)
                    return
                except OSError as e:
                    print("Not a supported image format")
                    quit(1)
        super().command(arg)

    def commandHelp(self):
        print('Load an image:\n    path=/filepath/to/image.png')

    def savePreset(self):
        # Maintain the illusion that the scale spinbox is one widget
        scaleBox = self.page.spinBox_scale
        stretchScaleBox = self.page.spinBox_scale_stretch
        if self.page.checkBox_stretch.isChecked():
            scaleBox.setValue(stretchScaleBox.value())
        else:
            stretchScaleBox.setValue(scaleBox.value())
        return super().savePreset()

    def update(self):
        # Maintain the illusion that the scale spinbox is one widget
        scaleBox = self.page.spinBox_scale
        stretchScaleBox = self.page.spinBox_scale_stretch
        if self.page.checkBox_stretch.isChecked():
            scaleBox.setVisible(False)
            stretchScaleBox.setVisible(True)
        else:
            scaleBox.setVisible(True)
            stretchScaleBox.setVisible(False)