from dataclasses import dataclass
import tkinter as tk
from tkinter import ttk, messagebox


@dataclass
class ExportSettings:
    orientation: str = "horizontal"
    spacing: int = 0
    margin: int = 0
    rows: int = 0
    columns: int = 0
    output_name: str = "flipbook.png"


class ExportSettingsDialog(tk.Toplevel):
    def __init__(self, parent: tk.Misc, initial_settings: ExportSettings | None = None) -> None:
        super().__init__(parent)
        self.title("Default Export Settings")
        self.resizable(False, False)
        self.transient(parent)
        self.grab_set()
        self.result: ExportSettings | None = None

        settings = initial_settings or ExportSettings()
        self.orientation_var = tk.StringVar(value=settings.orientation)
        self.spacing_var = tk.StringVar(value=str(settings.spacing))
        self.margin_var = tk.StringVar(value=str(settings.margin))
        self.rows_var = tk.StringVar(value=str(settings.rows))
        self.columns_var = tk.StringVar(value=str(settings.columns))
        self.output_name_var = tk.StringVar(value=settings.output_name)

        container = ttk.Frame(self, padding=10)
        container.grid(row=0, column=0, sticky="nsew")
        container.columnconfigure(1, weight=1)

        ttk.Label(container, text="Orientation").grid(row=0, column=0, sticky="w", pady=4)
        orientation_combo = ttk.Combobox(
            container,
            state="readonly",
            values=["horizontal", "vertical"],
            textvariable=self.orientation_var,
            width=20,
        )
        orientation_combo.grid(row=0, column=1, sticky="ew", pady=4)

        ttk.Label(container, text="Frame Spacing (px)").grid(row=1, column=0, sticky="w", pady=4)
        ttk.Spinbox(container, from_=0, to=999, textvariable=self.spacing_var, width=10).grid(
            row=1, column=1, sticky="w", pady=4
        )

        ttk.Label(container, text="Margin (px)").grid(row=2, column=0, sticky="w", pady=4)
        ttk.Spinbox(container, from_=0, to=999, textvariable=self.margin_var, width=10).grid(
            row=2, column=1, sticky="w", pady=4
        )

        ttk.Label(container, text="Rows (0 = auto)").grid(row=3, column=0, sticky="w", pady=4)
        ttk.Spinbox(container, from_=0, to=999, textvariable=self.rows_var, width=10).grid(
            row=3, column=1, sticky="w", pady=4
        )

        ttk.Label(container, text="Columns (0 = auto)").grid(row=4, column=0, sticky="w", pady=4)
        ttk.Spinbox(container, from_=0, to=999, textvariable=self.columns_var, width=10).grid(
            row=4, column=1, sticky="w", pady=4
        )

        ttk.Label(container, text="Default File Name").grid(row=5, column=0, sticky="w", pady=4)
        ttk.Entry(container, textvariable=self.output_name_var, width=24).grid(row=5, column=1, sticky="ew", pady=4)

        actions = ttk.Frame(container)
        actions.grid(row=6, column=0, columnspan=2, sticky="e", pady=(10, 0))
        ttk.Button(actions, text="Cancel", command=self._cancel).grid(row=0, column=0, padx=4)
        ttk.Button(actions, text="Apply", command=self._apply).grid(row=0, column=1, padx=4)

        self.protocol("WM_DELETE_WINDOW", self._cancel)

    def show(self) -> ExportSettings | None:
        self.wait_window(self)
        return self.result

    def _apply(self) -> None:
        try:
            spacing = int(self.spacing_var.get())
            margin = int(self.margin_var.get())
            rows = int(self.rows_var.get())
            columns = int(self.columns_var.get())
        except ValueError:
            messagebox.showerror(
                "Invalid settings",
                "Spacing, margin, rows, and columns must be valid whole numbers.",
                parent=self,
            )
            return

        if spacing < 0 or margin < 0 or rows < 0 or columns < 0:
            messagebox.showerror("Invalid settings", "Spacing, margin, rows, and columns cannot be negative.", parent=self)
            return

        orientation = self.orientation_var.get()
        if orientation not in {"horizontal", "vertical"}:
            messagebox.showerror("Invalid settings", "Orientation must be horizontal or vertical.", parent=self)
            return

        output_name = self.output_name_var.get().strip() or "flipbook.png"
        if not output_name.lower().endswith(".png"):
            output_name = f"{output_name}.png"

        self.result = ExportSettings(
            orientation=orientation,
            spacing=spacing,
            margin=margin,
            rows=rows,
            columns=columns,
            output_name=output_name,
        )
        self.destroy()

    def _cancel(self) -> None:
        self.result = None
        self.destroy()