import os  # OS module for interacting with the operating system (file management, etc.)
import re
import sys  # Provides access to system-specific parameters and functions
import tkinter as tk  # GUI module for creating desktop applications
from tkinter import filedialog, messagebox  # Additional tkinter components for file dialogs and message boxes
import subprocess  # Module to run system commands
import threading  # Threading module to run tasks concurrently
import json  # JSON module for working with JSON data
import logging  # Logging module for tracking events and errors
import pdfplumber  # Library for extracting text and tables from PDFs
#from pdfplumber.utils import get_bbox_overlap, obj_to_bbox  # Helper functions from pdfplumber for working with bounding boxes
from pdfplumber.utils.exceptions import PdfminerException  # Exception related to PDF processing
from joblib import delayed, cpu_count, parallel_backend, Parallel  # Joblib for parallel processing and optimization
import customtkinter as ctk
import tkinter.font as tkfont



# ========================
# Parser Configuration
# ========================

# Function to suppress PDFMiner logging, reducing verbosity
def suppress_pdfminer_logging():
    for logger_name in [
        #"pdfminer",  # Various pdfminer modules to suppress logging from
        #"pdfminer.pdfparser",
        #"pdfminer.pdfdocument",
        "pdfminer.pdfpage",
        #"pdfminer.converter",
        #"pdfminer.layout",
        #"pdfminer.cmapdb",
        #"pdfminer.utils"
    ]:
        logging.getLogger(logger_name).setLevel(logging.ERROR)  # Set logging level to ERROR to suppress lower levels


PARALLEL_THRESHOLD = 16  # Number of pages to use for deciding between serial or parallel processing


TEXT_EXTRACTION_SETTINGS = {
    "x_tolerance": 1.5,  # Horizontal tolerance for text extraction
    "y_tolerance": 2.5,  # Vertical tolerance for text extraction
    "char_dir": "ltr",
    "keep_blank_chars": False,  # Option to retain blank characters in the extracted text
    "use_text_flow": True,  # Option to use text flow for better structure
}

# Regex zur Entfernung unerwünschter Zeichen:
EUROPEAN_PRINTABLES_PATTERN = re.compile(r"[^\n\r\t \w\u0000-\uFFFF]")
# EUROPEAN_PRINTABLES_PATTERN = re.compile(r"[^ \t\n\r0-9a-zA-ZäöüÄÖÜßÀ-ÿ.,;:!?(){}\[\]„“‚‘\"'´`\-_/+*=%^~|&§#@€$£<>\\]")

CID_PATTERN = re.compile(r"\(cid:\d+\)")

# Function to clean up text by removing unwanted hyphenations and newlines
def clean_cell_text(text):
    if not isinstance(text, str):
        return ""

    # Entferne Silbentrennzeichen am Zeilenende
    text = text.replace("-\n", "")
    text = text.replace("\n", " ")
    text = CID_PATTERN.sub("", text)
    
    # Entferne alle Zeichen, die nicht zu den definierten druckbaren Zeichen gehören
    cleaned_text = EUROPEAN_PRINTABLES_PATTERN.sub("", text)

    return cleaned_text

# Function to safely clean and join row cell data
def safe_join(row):
    return [clean_cell_text(str(cell)) if cell is not None else "" for cell in row]  # Clean each cell in the row, or return empty if None


# Function to clamp bounding box coordinates within page boundaries
def clamp_bbox(bbox, page_width, page_height, precision=3):
    x0, top, x1, bottom = bbox
    x0 = max(0, min(x0, page_width))
    x1 = max(0, min(x1, page_width))
    top = max(0, min(top, page_height))
    bottom = max(0, min(bottom, page_height))
    
    # Hier runden
    return (
        round(x0, precision),
        round(top, precision),
        round(x1, precision),
        round(bottom, precision)
    )

# Hauptfunktion zur Verarbeitung einer einzelnen PDF-Seite
def process_page(args):
#    suppress_pdfminer_logging()
    try:
        page_number, pdf_path, TEXT_EXTRACTION_SETTINGS = args
        with pdfplumber.open(pdf_path) as pdf:
            page = pdf.pages[page_number]
            output = f"\n\nPage {page_number + 1}\n"
            width, height = page.width, page.height

            # Seitenränder (5 %) abschneiden
            margin_x = width * 0.05
            margin_y = height * 0.05
            content_bbox = (margin_x, margin_y, width - margin_x, height - margin_y)
            cropped_page = page.crop(content_bbox)


            # 1. Bounding Boxes aus find_tables(für späteres ausschließen der fließtexterkennung)
            table_bboxes = []
            for table in cropped_page.find_tables():
                bbox = clamp_bbox(table.bbox, width, height)
#                if cropped_page.crop(bbox).chars:
#                    table_bboxes.append(bbox)
                cropped_chars = cropped_page.crop(bbox).chars
                valid_chars = [
                    c for c in cropped_chars
                    if not EUROPEAN_PRINTABLES_PATTERN.search(c["text"])
                ]
                if valid_chars:
                    table_bboxes.append(bbox)



            # 2. Tabelleninhalt unabhängig extrahieren
            table_json_outputs = []

            for table_data_raw in cropped_page.extract_tables({"text_x_tolerance": 1.5}):
                if table_data_raw and len(table_data_raw) >= 1:
                    # Bereinige bereits hier alle Zellen der rohen Tabelle
                    table_data = [[clean_cell_text(cell) for cell in row] for row in table_data_raw]

                    headers = table_data[0]
                    rows = table_data[1:]
                    json_table = [dict(zip(headers, row)) for row in rows]
                    table_json_outputs.append(json.dumps(json_table, indent=1, ensure_ascii=False))




            # fließtexterkennunf ohne tabellenbereiche
            words_outside_tables = [
                word for word in cropped_page.extract_words(**TEXT_EXTRACTION_SETTINGS)
                if not any(
                    bbox[0] <= float(word['x0']) <= bbox[2] and
                    bbox[1] <= float(word['top']) <= bbox[3]
                    for bbox in table_bboxes
                ) and not EUROPEAN_PRINTABLES_PATTERN.search(word['text'])  # <== Filter auf gültige Zeichen
            ]

            # alle buchstaben je seite
            characters = [
                c for c in cropped_page.chars
                if not any(
                    bbox[0] <= float(c['x0']) <= bbox[2] and
                    bbox[1] <= float(c['top']) <= bbox[3]
                    for bbox in table_bboxes
                ) and not EUROPEAN_PRINTABLES_PATTERN.search(c['text'])  # <== Filter auf gültige Zeichen
            ]


            # durchschnittliche schriftgröße je seite
            letter_chars = [c for c in characters if c.get('text', '').isalpha()]
            average_font_size = (
                sum(float(c.get('size', 0)) for c in letter_chars) / len(letter_chars)
                if letter_chars else 0
            )

            # wann ist ein wort bold oder groß-geschrieben, um das label wichtig oder kapitel zu erhalten
            def classify_word(word, is_first_word_in_line):
                """Klassifiziere ein Wort individuell mit Stil, nur beim ersten Wort der Zeile."""
                word_top = float(word['top'])
                word_mid = (float(word['x0']) + float(word['x1'])) / 2

                # Alle Zeichen in Zeilenhöhe
                line_chars = sorted([
                    c for c in characters
                    if abs(c['top'] - word_top) < 2
                ], key=lambda c: c['x0'])

                # Funktion: Finde mind. 3 aufeinanderfolgende fettgedruckte Zeichen
                def has_consecutive_bold(chars):
                    count = 0
                    for c in chars:
                        if "bold" in c.get("fontname", "").lower() and float(c.get("size", 0)) >= average_font_size:
                            count += 1
                            if count >= 3:
                                return True
                        else:
                            count = 0
                    return False

                # Funktion: Finde mind. 3 aufeinanderfolgende große Buchstaben
                def has_consecutive_large_alpha(chars):
                    count = 0
                    for c in chars:
                        if c.get('text', '').isalpha() and float(c.get("size", 0)) >= average_font_size * 1.16:
                            count += 1
                            if count >= 3:
                                return True
                        else:
                            count = 0
                    return False

                prefix = ""
                if is_first_word_in_line:
                    if has_consecutive_bold(line_chars):
                        prefix += "important: "
                    if has_consecutive_large_alpha(line_chars):
                        prefix += "chapter: "

                return prefix + word['text']


            # Gruppierung in Zeilen mit Wortbasierter Analyse
            current_y = None
            line = []
            text_content = ""

            for word in words_outside_tables:
                word_y = float(word['top'])
                if current_y is None or abs(word_y - current_y) > 10:
                    if line:
                        text_content += " ".join(line).strip() + "\n"
                    current_y = word_y
                    line = [classify_word(word, is_first_word_in_line=True)]
                else:
                    line.append(classify_word(word, is_first_word_in_line=False))


            if line:
                text_content += " ".join(line).strip() + "\n"

            output += text_content.strip() + "\n"

            # Add table JSON outputs to the page output
            for idx, table in enumerate(table_json_outputs, start=1):
                output += f'"table {idx}":\n{table}\n'

            return page_number, output  # Return the processed page number and output content

#    except Exception as e:
#        return args[0], f"[ERROR] Page {args[0]+1} ({args[1]}): {str(e)}"  # Return an error message if an exception occurs

    except Exception as e:
        error_msg = str(e)
        if "Cannot set gray non-stroke color because" in error_msg and "invalid float value" in error_msg:
            friendly_msg = f"[ERROR] Seite {args[0]+1} ({args[1]}): Ungültiger Farbwert in PDF-Inhalt erkannt (möglicherweise beschädigte Farbdefinition). Verarbeitung nicht möglich."
            return args[0], friendly_msg
        else:
            return args[0], f"[ERROR] Seite {args[0]+1} ({args[1]}): {error_msg}"




# Function to process the entire PDF document
def process_pdf(pdf_path):
    suppress_pdfminer_logging()  # Suppress unnecessary logging
    try:
        if not os.path.exists(pdf_path):  # Check if the file exists
            return f"[ERROR] File not found: {pdf_path}"  # Return error message if file does not exist

        print(f"[INFO] Starting processing: {pdf_path}")  # Log the start of processing
        try:
            with pdfplumber.open(pdf_path) as pdf:  # Open the PDF using pdfplumber
                num_pages = len(pdf.pages)  # Get the number of pages in the PDF
        except PdfminerException as e:
            return f"[ERROR] Cannot open PDF: {pdf_path} – {str(e)}"  # Return error if the PDF cannot be opened
        except Exception as e:
            return f"[ERROR] General error opening PDF: {pdf_path} – {str(e)}"  # Return general error if any exception occurs

        pages = [(i, pdf_path, TEXT_EXTRACTION_SETTINGS) for i in range(num_pages)]  # Prepare the pages for processing

        try:
            results = run_serial(pages) if num_pages <= PARALLEL_THRESHOLD else run_parallel(pages)  # Run serial or parallel processing
        except (EOFError, BrokenPipeError, KeyboardInterrupt):
            return "[INFO] Processing was interrupted."  # Handle interruptions during processing

        sorted_results = sorted(results, key=lambda x: x[0])  # Sort results by page number
        final_output = "\n".join(text for _, text in sorted_results)  # Combine all page results into a single string

        base_name = os.path.splitext(os.path.basename(pdf_path))[0]  # Get the base name of the PDF file
        output_dir = os.path.dirname(pdf_path)  # Get the directory of the PDF file
        output_path = os.path.join(output_dir, f"{base_name}.txt")  # Generate the output file path

        with open(output_path, "w", encoding="utf-8", errors="ignore") as f:  # Open the output file for writing
            f.write(final_output)  # Write the final output to the file

        print(f"[INFO] Processing complete: {output_path}")  # Log the successful processing completion
        return "complete" 
        
    except (EOFError, BrokenPipeError, KeyboardInterrupt):
        return "[INFO] Processing interrupted by user."  # Handle user interruptions
    except Exception as e:
        return f"[ERROR] Unexpected error with '{pdf_path}': {str(e)}"  # Handle unexpected errors during processing

# Function to run the PDF processing serially (one page at a time)
def run_serial(pages):
    return [process_page(args) for args in pages]  # Process each page in sequence

# Function to run the PDF processing in parallel (across multiple cores)
def run_parallel(pages):
    available_cores = max(1, cpu_count() - 2)
    num_cores = min(available_cores, len(pages))
    print(f"Starting parallel processing with {num_cores} cores...")
    with parallel_backend('loky'):  # 'loky' ist der Standard-Backend bei joblib
        return Parallel(n_jobs=num_cores)(
            delayed(process_page)(args) for args in pages
        )

# Main function to process a list of PDFs
def process_pdfs_main():
    suppress_pdfminer_logging()  # Suppress unnecessary logging
    pdf_files = sys.argv[1:]  # Get PDF file paths from command-line arguments
    if not pdf_files:  # Check if any PDFs are provided
        print("No PDF files provided.")  # Log message if no PDFs are provided
        return

    small_pdfs = []  # List to store small PDFs (less than the parallel threshold)
    large_pdfs = []  # List to store large PDFs (greater than the parallel threshold)

    # Categorize PDFs into small and large based on the number of pages
    for path in pdf_files:
        if not os.path.exists(path):  # Check if the file exists
            print(f"File not found: {path}")  # Log error if file does not exist
            continue
        try:
            with pdfplumber.open(path) as pdf:  # Open the PDF
                if len(pdf.pages) <= PARALLEL_THRESHOLD:  # If the PDF has fewer pages than the threshold
                    small_pdfs.append(path)  # Add to small PDFs list
                else:
                    large_pdfs.append(path)  # Add to large PDFs list
        except PdfminerException:
            print(f"[ERROR] Password-protected PDF skipped: {path}")  # Log if the PDF is password-protected
        except Exception as e:
            print(f"[ERROR] Error opening {path}: {str(e)}")  # Log any other errors when opening the PDF

    # Process small PDFs in parallel (each on one core)
    if small_pdfs:
        available_cores = max(1, cpu_count() - 2)  # Determine the number of available cores
        num_cores = min(available_cores, len(small_pdfs))  # Use the lesser of available cores or small PDFs count
        print(f"\n[Phase 1] Starting parallel processing of small PDFs with {num_cores} cores, 2 leaving for system processes...")  # Log processing start
        results = Parallel(n_jobs=num_cores)(  # Run parallel processing for small PDFs
            delayed(process_pdf)(path) for path in small_pdfs
        )
        for r in results:
            print(r)  # Print the results for each small PDF

    # Process large PDFs one by one (in serial on all cores)
    for path in large_pdfs:
        print(f"\n[Phase 2] Processing large PDF: {os.path.basename(path)}")  # Log processing of large PDF
        print(process_pdf(path))  # Process the large PDF


# GUI


ctk.set_appearance_mode("System")
ctk.set_default_color_theme("dark-blue")

class FileManager:
    def __init__(self, master):
        self.master = master
        self.master.protocol("WM_DELETE_WINDOW", self.on_close)
        self.master.title("Parser-Sevenof9")
        self.master.geometry("1000x800+200+100")
        self.master.minsize(1000, 800)
        custom_font = tkfont.Font(family="Courier New", size=14)
        self.files = []
        self.last_selected_index = None
        self.parser_process = None

        self.master.grid_rowconfigure(1, weight=0)
        self.master.grid_columnconfigure(0, weight=1)

        # Label: "Selected PDF files"
        self.label = ctk.CTkLabel(master, text="Selected PDF files: (right mouse, you can copy path or open PDF)", height=30)
        self.label.grid(row=0, column=0, sticky="nw", padx=10, pady=(10, 0))

        # Listbox Frame
        listbox_frame = ctk.CTkFrame(master, height=200)
        listbox_frame.grid(row=1, column=0, sticky="nsew", padx=10)
        listbox_frame.grid_propagate(False)
        listbox_frame.grid_rowconfigure(0, weight=1)
        listbox_frame.grid_columnconfigure(0, weight=1)

        self.listbox = tk.Listbox(listbox_frame, selectmode=tk.MULTIPLE, font=custom_font,)
        scrollbar_listbox = tk.Scrollbar(listbox_frame, command=self.listbox.yview)
        self.listbox.config(yscrollcommand=scrollbar_listbox.set)

        self.listbox.grid(row=0, column=0, sticky="nsew")
        scrollbar_listbox.grid(row=0, column=1, sticky="ns")

        # Context Menu
        self.context_menu = tk.Menu(master, tearoff=0)
        self.context_menu.add_command(label="Remove selected", command=self.remove_file)
        self.context_menu.add_separator()
        self.context_menu.add_command(label="Copy file location", command=self.copy_file_location)
        self.context_menu.add_command(label="Open in default PDF app", command=self.open_file_in_default_app)
        self.listbox.bind("<Button-3>", self.show_context_menu)

        self.listbox.bind("<<ListboxSelect>>", self.show_text_file)
        self.listbox.bind("<Button-1>", self.on_listbox_click)
        self.listbox.bind("<Shift-Button-1>", self.on_listbox_shift_click)

        # Button Frame
        button_frame = ctk.CTkFrame(master, height=40)
        button_frame.grid(row=2, column=0, sticky="nsew", padx=10, pady=5)
        button_frame.grid_propagate(False)

        button_frame.grid_columnconfigure((0, 1, 2, 3, 4, 5), weight=1)

        ctk.CTkButton(button_frame, text="Add Folder", command=self.add_folder).grid(row=0, column=0, padx=5, pady=5)
        ctk.CTkButton(button_frame, text="Select Files", command=self.add_file).grid(row=0, column=1, padx=5, pady=5)
        ctk.CTkButton(button_frame, text="Remove Selected", command=self.remove_file).grid(row=0, column=2, padx=5, pady=5)
        ctk.CTkButton(button_frame, text="Remove All", command=self.remove_all).grid(row=0, column=3, padx=5, pady=5)
        ctk.CTkButton(button_frame, text="Stop", command=self.stop_parser, fg_color="darkred", hover_color="red").grid(row=0, column=4, padx=5, pady=5)
        ctk.CTkButton(button_frame, text="Start Parser", command=self.start_parser, fg_color="darkgreen", hover_color="green").grid(row=0, column=5, padx=5, pady=5)

        # Label: "Text Frame"
        self.progress_label = ctk.CTkLabel(master, text="Text Frame: (select a PDF, you can copy text parts)", height=30)
        self.progress_label.grid(row=3, column=0, sticky="nw", padx=10)

        # Text Frame
        text_frame = ctk.CTkFrame(master, height=250)
        text_frame.grid(row=4, column=0, sticky="nsew", padx=10, pady=5)
        text_frame.grid_propagate(False)
        text_frame.grid_rowconfigure(0, weight=1)
        text_frame.grid_columnconfigure(0, weight=1)

        self.text_widget = tk.Text(text_frame, wrap=tk.WORD, font=custom_font,)
        scrollbar_text = tk.Scrollbar(text_frame, command=self.text_widget.yview)
        self.text_widget.config(yscrollcommand=scrollbar_text.set)

        self.text_widget.grid(row=0, column=0, sticky="nsew")
        scrollbar_text.grid(row=0, column=1, sticky="ns")

        # Label: "Progress"
        self.progress_label = ctk.CTkLabel(master, text="Progress: (Error and success messages are not always correct)", height=30)
        self.progress_label.grid(row=5, column=0, sticky="nw", padx=10)

        # Progress Frame
        progress_frame = ctk.CTkFrame(master, height=160)
        progress_frame.grid(row=6, column=0, sticky="nsew", padx=10, pady=(0, 10))
        progress_frame.grid_propagate(False)
        progress_frame.grid_rowconfigure(0, weight=1)
        progress_frame.grid_columnconfigure(0, weight=1)

        self.progress_text = tk.Text(progress_frame, state=tk.DISABLED)
        scrollbar_progress = tk.Scrollbar(progress_frame, command=self.progress_text.yview)
        self.progress_text.config(yscrollcommand=scrollbar_progress.set)

        self.progress_text.grid(row=0, column=0, sticky="nsew")
        scrollbar_progress.grid(row=0, column=1, sticky="ns")

    def on_close(self):
        if self.parser_process:
            self.stop_parser()
        # ggf. geplante after-Aufrufe canceln
        if hasattr(self, 'after_id'):
            self.master.after_cancel(self.after_id)
        self.master.destroy()


    def on_listbox_click(self, event):
        # Handle single left-click selection; clear previous selection
        index = self.listbox.nearest(event.y)
        self.listbox.selection_clear(0, tk.END)
        self.listbox.selection_set(index)
        self.last_selected_index = index
        self.show_text_file(None)
        return "break"  # Prevent default event propagation

    def on_listbox_shift_click(self, event):
        # Handle shift-click for range selection
        index = self.listbox.nearest(event.y)
        if self.last_selected_index is None:
            self.last_selected_index = index
        start, end = sorted((self.last_selected_index, index))
        self.listbox.selection_clear(0, tk.END)
        for i in range(start, end + 1):
            self.listbox.selection_set(i)
        return "break"

    def show_context_menu(self, event):
        # Show right-click context menu if any item is selected
        if self.listbox.curselection():
            self.context_menu.tk_popup(event.x_root, event.y_root)

    def add_folder(self):
        # Add all PDFs from a selected folder
        folder = filedialog.askdirectory(title="Select Folder")
        if not folder:
            return
        for root, _, files in os.walk(folder):
            for file in files:
                if file.lower().endswith(".pdf"):
                    path = os.path.normpath(os.path.join(root, file))
                    if path not in self.files:
                        self.files.append(path)
                        self.listbox.insert(tk.END, path)

    def add_file(self):
        # Add selected individual PDF files
        paths = filedialog.askopenfilenames(title="Select PDF Files", filetypes=[("PDF Files", "*.pdf")])
        for path in paths:
            path = os.path.normpath(path) 
            if path not in self.files:
                self.files.append(path)
                self.listbox.insert(tk.END, path)

    def remove_file(self):
        # Remove selected files from list and internal storage
        selection = self.listbox.curselection()
        if not selection:
            messagebox.showwarning("Notice", "Please select an entry to remove.")
            return
        for index in reversed(selection):  # Reverse to avoid index shifting
            self.listbox.delete(index)
            del self.files[index]
        self.text_widget.delete(1.0, tk.END)

    def copy_file_location(self):
        selection = self.listbox.curselection()
        if not selection:
            return
        index = selection[0]
        path = self.files[index]
        self.master.clipboard_clear()
        self.master.clipboard_append(path)
        self.master.update()  # erforderlich, um Inhalt im Clipboard zu halten

    def open_file_in_default_app(self):
        selection = self.listbox.curselection()
        if not selection:
            return
        index = selection[0]
        path = self.files[index]
        if os.path.exists(path):
            try:
                os.startfile(path)
            except Exception as e:
                messagebox.showerror("Error", f"Cannot open file:\n{e}")
        else:
            messagebox.showwarning("File not found", "The selected file could not be found.")

    def remove_all(self):
        # Remove all files from the list
        self.listbox.delete(0, tk.END)
        self.files.clear()
        self.text_widget.delete(1.0, tk.END)

    def start_parser(self):
        # Validate input and launch parser in separate thread
        if not self.files:
            messagebox.showinfo("No Files", "Please select at least one file.")
            return
        self.progress_text.config(state=tk.NORMAL)
        self.progress_text.delete(1.0, tk.END)
        self.progress_text.insert(tk.END, "Starting parser...\n")
        self.progress_text.config(state=tk.DISABLED)

        # Launch parsing in background to avoid UI freeze
        thread = threading.Thread(target=self.run_parser)
        thread.start()

    def stop_parser(self):
        # Terminate running parser process if active
        if self.parser_process and self.parser_process.poll() is None:
            self.parser_process.terminate()
            self.append_progress_text("Parser process was stopped.\n")
        else:
            self.append_progress_text("No active parser process to stop.\n")

    def run_parser(self):
        # Internal method to run the external parser script
        try:
            self.parser_process = subprocess.Popen(
                [sys.executable, __file__] + self.files,
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
                text=True,
                encoding='utf-8',
                errors='ignore',
                bufsize=4096
            )
            for line in self.parser_process.stdout:
                self.append_progress_text(line)
            self.parser_process.stdout.close()
            self.parser_process.wait()

            if self.parser_process.returncode == 0:
                self.append_progress_text("\nParser finished successfully.\n")
                self.show_messagebox_threadsafe("Parser Done", "The parser was executed successfully.")
            else:
                self.append_progress_text("\nError while running the parser.\n")
                self.show_messagebox_threadsafe("Error", "Error while running the parser.")
        except Exception as e:
            self.append_progress_text(f"Error: {e}\n")
            self.show_messagebox_threadsafe("Error", f"Error during execution:\n{e}")
        finally:
            self.parser_process = None

    def append_progress_text(self, text):
        # Thread-safe method to append text to the progress view
        self.progress_text.after(0, lambda: self._insert_text(text))

    def _insert_text(self, text):
        # Append text and scroll to bottom
        self.progress_text.config(state=tk.NORMAL)
        self.progress_text.insert(tk.END, text)
        self.progress_text.see(tk.END)
        self.progress_text.config(state=tk.DISABLED)

    def show_messagebox_threadsafe(self, title, message):
        # Display a messagebox from a background thread
        self.master.after(0, lambda: messagebox.showinfo(title, message))

    def show_text_file(self, event):
        # Load and show the content of the corresponding .txt file (if available)
        selection = self.listbox.curselection()
        if not selection:
            return
        index = selection[0]
        path = self.files[index]
        txt_path = os.path.splitext(path)[0] + ".txt"
        self.text_widget.delete(1.0, tk.END)
        if os.path.exists(txt_path):
            try:
                with open(txt_path, "r", encoding="utf-8", errors="ignore") as f:
                    self.text_widget.insert(tk.END, f.read())
            except Exception as e:
                self.text_widget.insert(tk.END, f"Error loading text file:\n{e}")
        else:
            self.text_widget.insert(tk.END, "[No corresponding .txt file found]")





def main():
    if len(sys.argv) > 1:
        process_pdfs_main()
    else:
        launch_gui()

def launch_gui():
    root = ctk.CTk()
    app = FileManager(root)
    root.mainloop()

# MAIN

if __name__ == "__main__":
    main()