import os
import subprocess
import json
import ttkbootstrap as tb
from ttkbootstrap.constants import *
from tkinter import filedialog, messagebox, StringVar, BooleanVar
from ..core.core import convert_markdown

CONFIG_FILE = os.path.join(os.path.expanduser("~"), ".markdown_converter_config.json")

def save_config(font_name):
    # This function seems duplicated with config.py, consider centralizing
    with open(CONFIG_FILE, "w", encoding="utf-8") as f:
        json.dump({"font": font_name}, f)

def load_config():
    # This function seems duplicated with config.py, consider centralizing
    if os.path.exists(CONFIG_FILE):
        with open(CONFIG_FILE, "r", encoding="utf-8") as f:
            data = json.load(f)
            return data.get("font", "")
    return ""

def open_with_default_app(filepath):
    """Opens a file with the default registered application."""
    if not filepath:
        messagebox.showwarning("Warning", "No output file has been generated yet.")
        return
    try:
        os.startfile(filepath)  # Windows-specific
    except FileNotFoundError:
        messagebox.showerror("Error", f"File not found:\n{filepath}")
    except Exception as e:
        messagebox.showerror("Error", f"Could not open the file:\n{str(e)}")

def open_output_folder(filepath):
    """Opens the folder containing the specified file."""
    if not filepath:
        messagebox.showwarning("Warning", "No output file has been generated yet.")
        return
    try:
        folder = os.path.dirname(filepath)
        os.startfile(folder)
    except Exception as e:
        messagebox.showerror("Error", f"Could not open the folder:\n{str(e)}")

def run_app():
    """Initializes and runs the main application window."""
    app = tb.Window(themename="sandstone")
    app.title("Markdown Converter")
    app.geometry("680x280")  # Increased height for the new widget
    app.resizable(False, False)

    # --- Variables ---
    selected_file = StringVar()
    selected_font = StringVar(value=load_config())
    selected_template = StringVar()
    output_path = StringVar()
    add_toc_var = BooleanVar(value=True) # Variable for the TOC checkbox

    # --- Functions ---
    def browse_markdown():
        """Opens a file dialog to select a Markdown file."""
        path = filedialog.askopenfilename(
            title="Select a Markdown file",
            filetypes=[("Markdown files", "*.md"), ("All files", "*.*")]
        )
        if path:
            selected_file.set(path)

    def browse_template():
        """Opens a file dialog to select a DOCX or DOTX template file."""
        path = filedialog.askopenfilename(
            title="Select a template file",
            filetypes=[
                ("Word Documents", "*.docx"),
                ("Word Templates", "*.dotx"),
                ("All files", "*.*")
            ]
        )
        if path:
            selected_template.set(path)

    def convert(fmt):
        """Handles the conversion process when a button is clicked."""
        file_path = selected_file.get()
        font = selected_font.get()
        template = selected_template.get()
        add_toc = add_toc_var.get()

        if not file_path:
            messagebox.showerror("Error", "Please select a Markdown file.")
            return

        try:
            output = convert_markdown(file_path, fmt, add_toc, font, template)
            output_path.set(output)
            save_config(font) # Save font on successful conversion
            messagebox.showinfo("Success", f"File converted successfully:\n{output}")
        except Exception as e:
            messagebox.showerror("Error", f"An error occurred during conversion:\n{str(e)}")

    # --- Layout ---
    main_frame = tb.Frame(app, padding=10)
    main_frame.pack(fill=BOTH, expand=True)

    # Row 0: Input file
    tb.Label(main_frame, text="Markdown File:").grid(row=0, column=0, padx=(0, 10), pady=5, sticky="w")
    tb.Entry(main_frame, textvariable=selected_file, width=60).grid(row=0, column=1, padx=5, sticky="ew")
    tb.Button(main_frame, text="Browse...", command=browse_markdown, bootstyle=PRIMARY).grid(row=0, column=2, padx=5)

    # Row 1: Font (for PDF)
    tb.Label(main_frame, text="Font (PDF):").grid(row=1, column=0, padx=(0, 10), pady=5, sticky="w")
    fonts = ["Arial", "Times New Roman", "Verdana", "Calibri", "Courier New"]
    tb.Combobox(main_frame, values=fonts, textvariable=selected_font, width=30, bootstyle=INFO).grid(row=1, column=1, sticky="w", padx=5)

    # Row 2: Template (for DOCX)
    tb.Label(main_frame, text="Template (DOCX):").grid(row=2, column=0, padx=(0, 10), pady=5, sticky="w")
    tb.Entry(main_frame, textvariable=selected_template, width=60).grid(row=2, column=1, padx=5, sticky="ew")
    tb.Button(main_frame, text="Browse...", command=browse_template, bootstyle=SECONDARY).grid(row=2, column=2, padx=5)
    
    # Row 3: Options (TOC)
    tb.Checkbutton(
        main_frame,
        text="Add Table of Contents at the beginning",
        variable=add_toc_var,
        bootstyle="primary-round-toggle"
    ).grid(row=3, column=1, pady=10, sticky="w")

    # Row 4: Action Buttons
    action_frame = tb.Frame(main_frame)
    action_frame.grid(row=4, column=0, columnspan=3, pady=10)
    
    tb.Button(action_frame, text="Convert to PDF", command=lambda: convert("PDF"), bootstyle=SUCCESS).pack(side=LEFT, padx=5)
    tb.Button(action_frame, text="Convert to DOCX", command=lambda: convert("DOCX"), bootstyle=SUCCESS).pack(side=LEFT, padx=5)
    
    tb.Button(action_frame, text="Open File", command=lambda: open_with_default_app(output_path.get()), bootstyle=WARNING).pack(side=LEFT, padx=(20, 5))
    tb.Button(action_frame, text="Open Folder", command=lambda: open_output_folder(output_path.get()), bootstyle=WARNING).pack(side=LEFT, padx=5)
    
    main_frame.columnconfigure(1, weight=1)

    app.mainloop()