import sys
import os
import re
import time
import subprocess
from datetime import datetime
from utils.utility import Utilities
from utils.image_handler import ImageProcessor, ExifHandler

from ui.main_window import Ui_MainWindow
from ui.exif_handler_window import ExifEditor

from PySide6 import QtWidgets
from PySide6.QtWidgets import (
    QMessageBox,
    QApplication,
    QMainWindow,
    QWidget,
    QVBoxLayout,
    QLabel,
    QLineEdit,
    QPushButton,
    QCheckBox,
    QFileDialog,
    QHBoxLayout,
    QSpinBox,
)

class Optima35QT6(QMainWindow, Ui_MainWindow):
    def __init__(self, exif_file, version):
        super(Optima35QT6, self).__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        self.define_settings(exif_file, version)
        self.setWindowTitle(f"{self.name} v{self.version}")
        self.default_ui_layout()
        self.define_gui_interaction()
# GUI
    def default_ui_layout(self):
        self.ui.png_quality_spinBox.setVisible(False)

    def define_gui_interaction(self):
        self.ui.input_folder_button.clicked.connect(self.browse_input_folder)
        self.ui.output_folder_button.clicked.connect(self.browse_output_folder)
        self.ui.start_button.clicked.connect(self.process)
        self.ui.image_type.currentIndexChanged.connect(self.update_quality_options)

        self.ui.exif_checkbox.stateChanged.connect(
            lambda state: self.handle_checkbox_state(state, 2, self.populate_exif)
        )

        self.ui.tabWidget.currentChanged.connect(self.on_tab_changed)
        self.ui.edit_exif_button.clicked.connect(self.open_exif_editor)
        self.ui.restart_button.clicked.connect(self.restart_app)

    def open_exif_editor(self):
        """Open the EXIF Editor."""
        self.exif_editor = ExifEditor(self.exif_data)
        self.exif_editor.exif_data_updated.connect(self.update_exif_data)
        self.exif_editor.show()

    def update_exif_data(self, updated_exif_data):
        """Update the EXIF data."""
        self.exif_data = updated_exif_data
        self.populate_exif()

    def handle_checkbox_state(self, state, desired_state, action):
        """Perform an action based on the checkbox state and a desired state. Have to use lambda when calling."""
        # improved by chatGPT
        if state == desired_state:
            action()

    def on_tab_changed(self, index):
        """Handle tab changes."""
        # chatgpt
        if index == 1:  # EXIF Tab
            self.handle_exif_file("read")
        elif index == 0:  # Main Tab
            self.handle_exif_file("write")

    def handle_exif_file(self, do):
        if do == "read":
            self.exif_data = self.utilities.read_yaml(self.exif_file)
        elif do == "write":
            self.utilities.write_yaml(self.exif_file, self.exif_data)

    def populate_exif(self):
        # partly chatGPT
        # Mapping of EXIF fields to comboboxes in the UI
        combo_mapping = {
            "make": self.ui.make_comboBox,
            "model": self.ui.model_comboBox,
            "lens": self.ui.lens_comboBox,
            "iso": self.ui.iso_comboBox,
            "image_description": self.ui.image_description_comboBox,
            "user_comment": self.ui.user_comment_comboBox,
            "artist": self.ui.artist_comboBox,
            "copyright_info": self.ui.copyright_info_comboBox,
        }
        self.populate_comboboxes(combo_mapping)

    def populate_comboboxes(self, combo_mapping):
        """Populate comboboxes with EXIF data."""
        # ChatGPT
        for field, comboBox in combo_mapping.items():
            comboBox.clear()  # Clear existing items
            comboBox.addItems(map(str, self.exif_data.get(field, [])))

    def update_quality_options(self):
            """Update visibility of quality settings based on selected format."""
            # ChatGPT
            selected_format = self.ui.image_type.currentText()
            # Hide all quality settings
            self.ui.png_quality_spinBox.setVisible(False)
            self.ui.jpg_quality_spinBox.setVisible(False)
            # Show relevant settings
            if selected_format == "jpg":
                self.ui.jpg_quality_spinBox.setVisible(True)
            elif selected_format == "webp":
                self.ui.jpg_quality_spinBox.setVisible(True)
            elif selected_format == "png":
                self.ui.png_quality_spinBox.setVisible(True)

    def browse_input_folder(self):
        folder = QFileDialog.getExistingDirectory(self, "Select Input Folder")
        if folder:
            self.ui.input_path.setText(folder)

    def browse_output_folder(self):
        folder = QFileDialog.getExistingDirectory(self, "Select Output Folder")
        if folder:
            self.ui.output_path.setText(folder)

    def change_statusbar(self, msg, timeout = 500):
        self.ui.statusBar.showMessage(msg, timeout)

    def handle_qprogressbar(self, current, total):
        progress = int((100 / total) * current)
        self.ui.progressBar.setValue(progress)

    def check_options(self):
        try:
            self.settings["input_folder"] = self.ui.input_path.text()
            self.settings["output_folder"] = self.ui.output_path.text()
            self.settings["file_format"] = self.ui.image_type.currentText()
            self.settings["jpg_quality"] = int(self.ui.jpg_quality_spinBox.text())
            self.settings["png_compression"] = int(self.ui.png_quality_spinBox.text())
            self.settings["invert_image_order"] = self.ui.revert_checkbox.isChecked()
            self.settings["grayscale"] = self.ui.grayscale_checkBox.isChecked()
            self.settings["copy_exif"] = self.ui.exif_copy_checkBox.isChecked()
            self.settings["own_exif"] = self.ui.exif_checkbox.isChecked()
            self.settings["font_size"] = self.ui.font_size_comboBox.currentIndex() + 1
            self.settings["optimize"] = self.ui.optimize_checkBox.isChecked()
            self.settings["own_date"] = self.ui.add_date_checkBox.isChecked()

            if self.ui.resize_checkbox.isChecked():
                self.settings["resize_percentage"] = int(self.ui.resize_spinBox.text())

            if self.ui.brightness_checkbox.isChecked():
                self.settings["brightness_percentage"] = int(self.ui.brightness_spinBox.text())

            if self.ui.contrast_checkbox.isChecked():
                self.settings["contrast_percentage"] = int(self.ui.contrast_spinBox.text())

            if self.ui.rename_checkbox.isChecked() and self.ui.filename.text() != "":
                self.settings["new_file_names"] = self.ui.filename.text()

            if self.ui.watermark_checkbox.isChecked() and self.ui.watermark_lineEdit.text() != "":
                self.settings["watermark"] = self.ui.watermark_lineEdit.text()

            if self.settings["own_exif"]:
                self.selected_exif = self.collect_selected_exif()
                if self.ui.add_date_checkBox.isChecked():
                    self.selected_exif["date_time_original"] = self.get_date()
                if self.ui.gps_checkBox.isChecked():
                    self.settings["gps"] = [self.ui.lat_lineEdit.text(), self.ui.long_lineEdit.text()]
                else:
                    self.settings["gps"] = False

        except Exception as e:
            print(f"Whoops: {e}")

    def get_date(self):
        date_input = self.ui.dateEdit.date().toString("yyyy-MM-dd")
        new_date = datetime.strptime(date_input, "%Y-%m-%d")
        return new_date.strftime("%Y:%m:%d 00:00:00")

    def collect_selected_exif(self):
        user_data = {}
        user_data["make"] = self.ui.make_comboBox.currentText()
        user_data["model"] = self.ui.model_comboBox.currentText()
        user_data["lens"] = self.ui.lens_comboBox.currentText()
        user_data["iso"] = self.ui.iso_comboBox.currentText()
        user_data["image_description"] = self.ui.image_description_comboBox.currentText()
        user_data["user_comment"] = self.ui.user_comment_comboBox.currentText()
        user_data["artist"] = self.ui.artist_comboBox.currentText()
        user_data["copyright_info"] = self.ui.copyright_info_comboBox.currentText()
        user_data["software"] = f"OPTIMA-35 {self.version}"
        return user_data

    def rebuild_ui(self):
        # Define the bash script to execute
        print("Rebuild function disabled")
        return
        bash_script = "rebuild_ui.sh"
        os.system(bash_script)

    def restart_app(self):
        """Restarts the application."""
        self.rebuild_ui()
        # chatGPT
        python = sys.executable  # Path to the Python interpreter
        os.execv(python, [python] + sys.argv)

# core
    def define_settings(self, exif_file, version):
        self.name = "OPTIMA-35"
        self.version = version
        self.utilities = Utilities()
        self.image_processor = ImageProcessor()
        self.exif_handler = ExifHandler()
        self.exif_file = exif_file
        self.settings = {
            "input_folder": None,
            "output_folder": None,
            "file_format": None,
            "resize_percentage": False,
            "contrast_percentage": False,
            "brightness_percentage": False,
            "new_file_names": False,
            "invert_image_order": False,
            "copy_exif": False,
            "own_exif": False,
            "watermark": False,
            "grayscale": False,
            "jpg_quality": None,
            "png_compression": None,
            "font_size": None,
            "optimize": False,
            "gps": False
        }
        self.exif_data = None

    def modify_timestamp_in_exif(self, exif_data, filename):
            """"Takes exif data and adjust time to fit ending of filename."""
            try:
                last_tree = filename[-3:len(filename)]
                total_seconds = int(re.sub(r'\D+', '', last_tree))
                minutes = total_seconds // 60
                seconds = total_seconds % 60
                time = datetime.strptime(exif_data["date_time_original"], "%Y:%m:%d %H:%M:%S") # change date time string back to an time object for modification
                new_time = time.replace(hour=12, minute=minutes, second=seconds)
                exif_data["date_time_original"] = new_time.strftime("%Y:%m:%d %H:%M:%S")
                return exif_data

            except ValueError:
                print("Modifying date went wrong, exiting...")
                exit()

    def process(self):
        self.ui.start_button.setEnabled(False)
        self.ui.restart_button.setEnabled(False)
        self.check_options() # Get all user selected data
        input_folder_valid = os.path.exists(self.settings["input_folder"])
        output_folder_valid = os.path.exists(self.settings["output_folder"])
        if not input_folder_valid or not output_folder_valid:
            QMessageBox.warning(self, "Warning", f"Input location {input_folder_valid}\nOutput folder {output_folder_valid}...")
            return

        input_folder = self.settings["input_folder"]
        output_folder = self.settings["output_folder"]

        image_files = [
            f for f in os.listdir(input_folder) if f.lower().endswith((".png", ".jpg", ".jpeg", ".webp"))
        ]

        i = 1
        for image_file in image_files:
            input_path = os.path.join(input_folder, image_file)

            if self.settings["new_file_names"] != False:
                image_name = self.name_images(self.settings["new_file_names"], i, len(image_files), self.settings["invert_image_order"])
            else:
                image_name = os.path.splitext(image_file)[0]

            output_path = os.path.join(output_folder, image_name)

            with self.image_processor.open_image(input_path) as img:
                processed_img = img

                if self.settings["resize_percentage"] != False:
                    processed_img = self.image_processor.resize_image(
                        image = processed_img, percent = self.settings["resize_percentage"]
                    )
                if self.settings["watermark"] != False:
                    processed_img = self.image_processor.add_watermark(processed_img, self.settings["watermark"], int(self.settings["font_size"]))
                if self.settings["grayscale"] != False: # There is a problem, if we first to grayscale and then watermark it braeks
                    processed_img = self.image_processor.grayscale(processed_img)
                if self.settings["brightness_percentage"] != False: # Does the order of brightness and contrast matter?
                    processed_img = self.image_processor.change_brightness(processed_img, self.settings["brightness_percentage"])
                if self.settings["contrast_percentage"] != False: # Does the order of brightness and contrast matter?
                    processed_img = self.image_processor.change_contrast(processed_img, self.settings["contrast_percentage"])

                if self.settings["own_exif"] != False:
                    selected_exif = self.selected_exif
                    if "date_time_original" in self.selected_exif:
                        selected_exif = self.modify_timestamp_in_exif(selected_exif, image_name)
                    exif_data = self.exif_handler.build_exif_dict(selected_exif, self.image_processor.get_image_size(processed_img))
                    if self.settings["gps"] != False:
                        latitude = float(self.settings["gps"][0])
                        longitude = float(self.settings["gps"][1])
                        exif_data = self.exif_handler.add_geolocation_to_exif(exif_data, latitude, longitude)

                elif self.settings["copy_exif"] == True:
                    # When copying exif from original, make sure to change Piexel X & Y Dimension to fit new size
                    try:
                        og_exif = self.exif_handler.get_exif_info(img)
                        og_exif["Exif"][40962], og_exif["Exif"][40963] = self.image_processor.get_image_size(processed_img)
                        exif_data = og_exif
                    except Exception:
                        # If an error happends it is because the picture does not have exif data
                        self.change_statusbar("Copying EXIF data selected, but no EXIF data is available in the original image file.")
                        exif_data = None
                elif self.settings["copy_exif"] == False:
                    exif_data = None
                    self.change_statusbar(f"exif data: {exif_data}")

                self.image_processor.save_image(
                    image = processed_img,
                    path = output_path,
                    exif_data = exif_data,
                    file_type = self.settings["file_format"],
                    jpg_quality = self.settings["jpg_quality"],
                    png_compressing = self.settings["png_compression"],
                    optimize = self.settings["optimize"]
                )

            self.handle_qprogressbar(i, len(image_files))
            i += 1
        QMessageBox.information(self, "Information", "Finished")
        self.ui.start_button.setEnabled(True)
        self.ui.restart_button.setEnabled(True)
        self.ui.progressBar.setValue(0)

    def name_images(self, base_name, current_image, total_images, invert):
            """"Returns name, combination of base_name and ending number."""
            total_digits = len(str(total_images))
            if invert:
                ending_number = total_images - (current_image - 1)
            else:
                ending_number = current_image
            ending = f"{ending_number:0{total_digits}}"
            return f"{base_name}_{ending}"

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)

    window = Optima35QT6(exif_file = "local_files/exif.yaml", version = "0.3.4")
    window.show()
    app.exec()