#!/usr/bin/env python3
"""
WImageEditTk.py

Tkinter-based GUI for WImageEdit, using wimage_core for:
  - ImageMagick command building (including rotation and parametric settings).
  - "Actions" (Color Pos/Neg, BW Pos/Neg).
  - Granite background with adjustable scale.
  - Simple per-file save/load of settings (imgedit_proc.json).
  - Directory defaults.

Layout:
  - Left panel: directory selection, file list, navigation, info.
  - Right panel: top canvas = Original, bottom canvas = Preview, controls on the right.

This version:
  - Shows TWO views stacked vertically:
      Top    = original (rotated, no processing except resize)
      Bottom = preview with current options applied (Pillow approximation).
  - Includes parametric controls for:
      - Sigmoidal contrast (contrast, midpoint)
      - Sharpen (radius, amount, threshold)
  - Includes rotation controls:
      - None / 90 / 180 / 270 / Custom
  - Displays a live ImageMagick command string based on current options.
"""
import sys, os
import subprocess
from pathlib import Path
from dataclasses import dataclass, field
from typing import Optional, Tuple, List

import tkinter as tk
from tkinter import ttk, filedialog, messagebox

from PIL import (
    Image,
    ImageTk,
    ExifTags,
    ImageOps,
    ImageFilter,
    ImageDraw,
    ImageFont,
)

from wimage_core import (
    EditOptions,
    build_imagemagick_cmd,
    build_granite_background_cmd,
    apply_action_preset,
    load_options_for_file,
    save_options_for_file,
    load_directory_defaults,
    save_directory_defaults,
)

import tempfile


# ---------------------- helpers / file listing / EXIF ----------------------


def get_exif_datetime_original(path: Path) -> Optional[str]:
    try:
        img = Image.open(path)
        exif = img._getexif()
        if not exif:
            return None
        rev = {v: k for k, v in ExifTags.TAGS.items()}
        dto_tag = rev.get("DateTimeOriginal")
        if not dto_tag:
            return None
        return exif.get(dto_tag)
    except Exception:
        return None


def list_image_files(directory: Path) -> List[Path]:
    """
    List files that are likely to be images.

    Includes common RAW extensions so directories with only RAWs won't appear empty.
    """
    exts = {
        ".jpg", ".jpeg", ".png", ".gif", ".tif", ".tiff", ".bmp",
        ".nef", ".cr2", ".cr3", ".arw", ".rw2", ".orf", ".dng", ".pef", ".srw",
    }
    return [p for p in sorted(directory.iterdir()) if p.suffix.lower() in exts]


# ----------------------------- app state ------------------------------------


@dataclass
class AppState:
    directory: Optional[Path] = None
    files: List[Path] = field(default_factory=list)
    current_index: int = 0
    base_image: Optional[Image.Image] = None    # unrotated full-res PIL image
    current_image: Optional[Image.Image] = None  # rotated version used for crop/preview
    current_photo_orig: Optional[ImageTk.PhotoImage] = None
    current_photo_prev: Optional[ImageTk.PhotoImage] = None
    crop_start: Optional[Tuple[int, int]] = None
    crop_rect_id: Optional[int] = None
    crop_box_canvas: Optional[Tuple[int, int, int, int]] = None
    image_size: Optional[Tuple[int, int]] = None
    canvas_size_orig: Optional[Tuple[int, int]] = None
    canvas_size_prev: Optional[Tuple[int, int]] = None


# ----------------------------- main GUI -------------------------------------


class WImageEditTk(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("WImageEditTk (Tkinter)")

        self.state = AppState()

        # IM command string (for display/copy)
        self.current_cmd_str: str = ""

        # UI variables
        self.dir_var = tk.StringVar(value="~/Downloads")

        self.color_var = tk.BooleanVar(value=True)
        self.sigmoidal_var = tk.BooleanVar(value=True)
        self.sig_contrast_var = tk.DoubleVar(value=6.0)
        self.sig_midpoint_var = tk.DoubleVar(value=0.5)

        self.sharpen_var = tk.BooleanVar(value=True)
        self.sharp_radius_var = tk.DoubleVar(value=0.0)
        self.sharp_amount_var = tk.DoubleVar(value=0.5)
        self.sharp_thresh_var = tk.DoubleVar(value=0.02)

        self.gray_var = tk.BooleanVar(value=False)
        self.invert_var = tk.BooleanVar(value=False)

        self.background_var = tk.BooleanVar(value=False)
        self.background_scale_var = tk.DoubleVar(value=1.1)

        # Rotation
        self.rotation_mode_var = tk.StringVar(value="None")  # None/90/180/270/Custom
        self.rotation_custom_var = tk.DoubleVar(value=0.0)

        # Annotation
        self.annot_size_var = tk.IntVar(value=32)
        self.annot_pos_var = tk.StringVar(value="Bottom")

        self.info_var = tk.StringVar(value="Select a directory to begin.")

        self._build_ui()

    # --------------------------- UI building ---------------------------------

    def _build_ui(self):
        # Main frame splits left (files) and right (images + controls)
        main = ttk.Frame(self, padding=5)
        main.pack(fill=tk.BOTH, expand=True)

        # LEFT PANEL: directory picker + file list + nav + info
        left = ttk.Frame(main, padding=5)
        left.pack(side=tk.LEFT, fill=tk.Y)

        # Directory picker at top *within* left panel
        dir_frame = ttk.Frame(left)
        dir_frame.pack(fill=tk.X, pady=(0, 5))
        ttk.Label(dir_frame, text="Directory:").pack(side=tk.LEFT)
        ttk.Entry(dir_frame, textvariable=self.dir_var, width=30).pack(side=tk.LEFT, padx=4)
        ttk.Button(dir_frame, text="...", width=3, command=self.select_directory).pack(side=tk.LEFT)

        ttk.Label(left, text="Files:").pack(anchor=tk.W)
        self.file_listbox = tk.Listbox(left, width=35, height=24)
        self.file_listbox.pack(fill=tk.BOTH, expand=True)
        self.file_listbox.bind("<<ListboxSelect>>", self.on_file_select)

        nav_frame = ttk.Frame(left)
        nav_frame.pack(fill=tk.X, pady=4)
        ttk.Button(nav_frame, text="Prev", command=self.prev_image).pack(side=tk.LEFT, expand=True, fill=tk.X)
        ttk.Button(nav_frame, text="Next", command=self.next_image).pack(side=tk.LEFT, expand=True, fill=tk.X)

        ttk.Label(left, textvariable=self.info_var, wraplength=260, justify=tk.LEFT).pack(fill=tk.X, pady=5)

        # RIGHT PANEL: top canvas (original), bottom canvas (preview), controls on the right
        right = ttk.Frame(main, padding=5)
        right.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)

        # Right is split: left area = canvases (stacked), right area = controls
        right_canvases = ttk.Frame(right)
        right_canvases.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)

        right_controls = ttk.Frame(right, padding=(5, 0))
        right_controls.pack(side=tk.LEFT, fill=tk.Y)

        # Canvases stacked: Original (top) and Preview (bottom)
        orig_label = ttk.Label(right_canvases, text="Original")
        orig_label.pack(anchor=tk.W)
        self.canvas_orig = tk.Canvas(right_canvases, bg="gray", width=600, height=300)
        self.canvas_orig.pack(fill=tk.BOTH, expand=True, pady=(0, 4))

        prev_label = ttk.Label(right_canvases, text="Preview")
        prev_label.pack(anchor=tk.W)
        self.canvas_prev = tk.Canvas(right_canvases, bg="gray", width=600, height=300)
        self.canvas_prev.pack(fill=tk.BOTH, expand=True)

        # Crop is defined by dragging on the ORIGINAL canvas
        self.canvas_orig.bind("<ButtonPress-1>", self.on_canvas_press)
        self.canvas_orig.bind("<B1-Motion>", self.on_canvas_drag)
        self.canvas_orig.bind("<ButtonRelease-1>", self.on_canvas_release)

        # Controls on the right
        # Actions frame
        actions_frame = ttk.LabelFrame(right_controls, text="Actions", padding=5)
        actions_frame.pack(fill=tk.X)

        ttk.Button(actions_frame, text="Color Pos",
                   command=lambda: self.apply_action("Color Pos")).pack(fill=tk.X, pady=1)
        ttk.Button(actions_frame, text="Color Neg",
                   command=lambda: self.apply_action("Color Neg")).pack(fill=tk.X, pady=1)
        ttk.Button(actions_frame, text="BW Pos",
                   command=lambda: self.apply_action("BW Pos")).pack(fill=tk.X, pady=1)
        ttk.Button(actions_frame, text="BW Neg",
                   command=lambda: self.apply_action("BW Neg")).pack(fill=tk.X, pady=1)

        # Processing options
        opts_frame = ttk.LabelFrame(right_controls, text="Processing", padding=5)
        opts_frame.pack(fill=tk.X, pady=(5, 0))

        ttk.Checkbutton(
            opts_frame, text="Color correction",
            variable=self.color_var, command=self.options_changed
        ).pack(anchor=tk.W)

        # Sigmoidal contrast + params
        ttk.Checkbutton(
            opts_frame, text="Sigmoidal contrast",
            variable=self.sigmoidal_var, command=self.options_changed
        ).pack(anchor=tk.W)

        sig_frame = ttk.Frame(opts_frame)
        sig_frame.pack(fill=tk.X, pady=(2, 0))
        ttk.Label(sig_frame, text="C:").pack(side=tk.LEFT)
        ttk.Spinbox(
            sig_frame, from_=0.0, to=20.0, increment=0.5,
            textvariable=self.sig_contrast_var, width=5,
            command=self.options_changed
        ).pack(side=tk.LEFT)
        ttk.Label(sig_frame, text="M:").pack(side=tk.LEFT, padx=(4, 0))
        ttk.Spinbox(
            sig_frame, from_=0.0, to=1.0, increment=0.05,
            textvariable=self.sig_midpoint_var, width=5,
            command=self.options_changed
        ).pack(side=tk.LEFT)

        # Sharpen + params
        ttk.Checkbutton(
            opts_frame, text="Sharpen",
            variable=self.sharpen_var, command=self.options_changed
        ).pack(anchor=tk.W)

        sharp_frame = ttk.Frame(opts_frame)
        sharp_frame.pack(fill=tk.X, pady=(2, 0))
        ttk.Label(sharp_frame, text="R:").pack(side=tk.LEFT)
        ttk.Spinbox(
            sharp_frame, from_=0.0, to=5.0, increment=0.1,
            textvariable=self.sharp_radius_var, width=5,
            command=self.options_changed
        ).pack(side=tk.LEFT)
        ttk.Label(sharp_frame, text="Amt:").pack(side=tk.LEFT, padx=(4, 0))
        ttk.Spinbox(
            sharp_frame, from_=0.0, to=5.0, increment=0.1,
            textvariable=self.sharp_amount_var, width=5,
            command=self.options_changed
        ).pack(side=tk.LEFT)
        ttk.Label(sharp_frame, text="Thr:").pack(side=tk.LEFT, padx=(4, 0))
        ttk.Spinbox(
            sharp_frame, from_=0.0, to=1.0, increment=0.01,
            textvariable=self.sharp_thresh_var, width=5,
            command=self.options_changed
        ).pack(side=tk.LEFT)

        ttk.Checkbutton(
            opts_frame, text="Grayscale",
            variable=self.gray_var, command=self.options_changed
        ).pack(anchor=tk.W)
        ttk.Checkbutton(
            opts_frame, text="Invert (neg)",
            variable=self.invert_var, command=self.options_changed
        ).pack(anchor=tk.W)

        ttk.Checkbutton(
            opts_frame, text="Granite background",
            variable=self.background_var, command=self.options_changed
        ).pack(anchor=tk.W)
        scale_row = ttk.Frame(opts_frame)
        scale_row.pack(fill=tk.X, pady=(4, 0))
        ttk.Label(scale_row, text="Background scale:").pack(side=tk.LEFT)
        ttk.Spinbox(
            scale_row,
            from_=1.0,
            to=2.0,
            increment=0.05,
            textvariable=self.background_scale_var,
            width=6,
            format="%.2f",
            command=self.options_changed,
        ).pack(side=tk.LEFT, padx=4)
        ttk.Label(scale_row, text="(1.1 ≈ 10% border)").pack(side=tk.LEFT)

        # Rotation controls
        rot_frame = ttk.LabelFrame(right_controls, text="Rotation", padding=5)
        rot_frame.pack(fill=tk.X, pady=5)

        def rot_rb(text, value):
            return ttk.Radiobutton(
                rot_frame, text=text, value=value,
                variable=self.rotation_mode_var, command=self.rotation_changed
            )

        rot_rb("None", "None").pack(anchor=tk.W)
        rot_rb("90°", "90").pack(anchor=tk.W)
        rot_rb("180°", "180").pack(anchor=tk.W)
        rot_rb("270°", "270").pack(anchor=tk.W)

        custom_row = ttk.Frame(rot_frame)
        custom_row.pack(fill=tk.X, pady=(2, 0))
        ttk.Radiobutton(
            custom_row, text="Custom:", value="Custom",
            variable=self.rotation_mode_var, command=self.rotation_changed
        ).pack(side=tk.LEFT)
        ttk.Spinbox(
            custom_row, from_=-360.0, to=360.0, increment=1.0,
            textvariable=self.rotation_custom_var, width=6,
            command=self.rotation_changed,
        ).pack(side=tk.LEFT, padx=4)

        # Annotation
        annot_frame = ttk.LabelFrame(right_controls, text="Text annotation", padding=5)
        annot_frame.pack(fill=tk.X, pady=5)

        ttk.Label(annot_frame, text="Text:").pack(anchor=tk.W)
        self.annot_text = tk.Text(annot_frame, width=30, height=3)
        self.annot_text.pack(fill=tk.X)
        self.annot_text.bind("<<Modified>>", self.on_annot_modified)

        ttk.Label(annot_frame, text="Font size:").pack(anchor=tk.W)
        ttk.Spinbox(
            annot_frame,
            from_=8,
            to=120,
            textvariable=self.annot_size_var,
            width=5,
            command=self.options_changed,
        ).pack(anchor=tk.W)

        ttk.Label(annot_frame, text="Position:").pack(anchor=tk.W)
        ttk.Radiobutton(
            annot_frame, text="Top", value="Top",
            variable=self.annot_pos_var, command=self.options_changed
        ).pack(anchor=tk.W)
        ttk.Radiobutton(
            annot_frame, text="Center", value="Center",
            variable=self.annot_pos_var, command=self.options_changed
        ).pack(anchor=tk.W)
        ttk.Radiobutton(
            annot_frame, text="Bottom", value="Bottom",
            variable=self.annot_pos_var, command=self.options_changed
        ).pack(anchor=tk.W)

        # Directory defaults
        defaults_frame = ttk.LabelFrame(right_controls, text="Directory defaults", padding=5)
        defaults_frame.pack(fill=tk.X, pady=5)
        ttk.Button(
            defaults_frame, text="Set from current image",
            command=self.set_directory_defaults_from_current
        ).pack(fill=tk.X)

        # IM command display
        cmd_frame = ttk.LabelFrame(right_controls, text="Current IM command", padding=5)
        cmd_frame.pack(fill=tk.BOTH, expand=True, pady=5)

        self.cmd_text = tk.Text(cmd_frame, width=40, height=6, wrap="word")
        self.cmd_text.pack(fill=tk.BOTH, expand=True)
        self.cmd_text.configure(state="disabled")

        btn_row = ttk.Frame(cmd_frame)
        btn_row.pack(fill=tk.X, pady=(4, 0))
        ttk.Button(btn_row, text="Copy IM Cmd", command=self.copy_cmd_to_clipboard).pack(side=tk.LEFT, expand=True, fill=tk.X)
        ttk.Button(btn_row, text="IM Preview", command=self.run_im_preview).pack(side=tk.LEFT, expand=True, fill=tk.X, padx=(4, 0))

        ttk.Label(
            cmd_frame,
            text="Note: if 'Granite background' is checked, two IM\n"
            "commands are used (subject + background).",
            justify=tk.LEFT,
            wraplength=260,
        ).pack(fill=tk.X, pady=(4, 0))


        # Actions buttons (bottom)
        action_frame = ttk.Frame(right_controls)
        action_frame.pack(fill=tk.X, pady=10)
        ttk.Button(action_frame, text="Process", command=self.process_current).pack(fill=tk.X)
        ttk.Button(action_frame, text="Quit", command=self.destroy).pack(fill=tk.X, pady=(5, 0))

        # Initial action
        # print(dir(self.dir_var))
        if os.path.exists(self.dir_var.get()):
            self.state.directory = Path(self.dir_var.get())
            self.load_files()
        
    # ------------------------------ directory & files ------------------------

    def select_directory(self):
        dirname = filedialog.askdirectory(title="Select image directory")
        if not dirname:
            return
        self.dir_var.set(dirname)
        self.state.directory = Path(dirname)
        self.load_files()

    def load_files(self):
        if not self.state.directory:
            return
        self.state.files = list_image_files(self.state.directory)
        self.file_listbox.delete(0, tk.END)
        for p in self.state.files:
            self.file_listbox.insert(tk.END, p.name)
        if self.state.files:
            self.state.current_index = 0
            self.file_listbox.selection_set(0)
            self.load_image(0)
        else:
            self.state.current_index = 0
            self.canvas_orig.delete("all")
            self.canvas_prev.delete("all")
            self.info_var.set("No image files found in directory.")
            self.update_cmd_display(clear=True)

    def on_file_select(self, event=None):
        sel = self.file_listbox.curselection()
        if not sel:
            return
        self.load_image(sel[0])

    def load_image(self, index: int):
        if index < 0 or index >= len(self.state.files):
            return
        self.state.current_index = index
        path = self.state.files[index]
        try:
            img = Image.open(path)
            self.state.base_image = img
            self.state.image_size = img.size

            # Reset crop
            self.state.crop_rect_id = None
            self.state.crop_box_canvas = None

            dto = get_exif_datetime_original(path)
            info = f"{path.name}\n{img.size[0]}x{img.size[1]}"
            if dto:
                info += f"\nEXIF DateTimeOriginal: {dto}"

            # Attempt to restore saved options or directory defaults
            self.restore_options_for_file(path)

            # Build rotated original + preview
            self.rebuild_original_and_preview(reset_crop=True)

            self.info_var.set(info)

        except Exception as e:
            messagebox.showerror("Error", f"Failed to load image:\n{e}")

    def display_on_canvas(self, canvas: tk.Canvas, img: Image.Image, is_original: bool):
        """Scale and display img on the given canvas, center it."""
        canvas_w = canvas.winfo_width() or 600
        canvas_h = canvas.winfo_height() or 300
        scale = min(canvas_w / img.size[0], canvas_h / img.size[1])
        new_size = (max(1, int(img.size[0] * scale)), max(1, int(img.size[1] * scale)))
        disp_img = img.resize(new_size, Image.LANCZOS)

        x0 = (canvas_w - new_size[0]) // 2
        y0 = (canvas_h - new_size[1]) // 2

        photo = ImageTk.PhotoImage(disp_img)
        canvas.delete("all")
        canvas.create_image(x0, y0, anchor=tk.NW, image=photo)
        canvas.image = photo  # prevent GC

        if is_original:
            self.state.canvas_size_orig = new_size
            self.state.current_photo_orig = photo
        else:
            self.state.canvas_size_prev = new_size
            self.state.current_photo_prev = photo

    def prev_image(self):
        if not self.state.files:
            return
        idx = (self.state.current_index - 1) % len(self.state.files)
        self.file_listbox.selection_clear(0, tk.END)
        self.file_listbox.selection_set(idx)
        self.load_image(idx)

    def next_image(self):
        if not self.state.files:
            return
        idx = (self.state.current_index + 1) % len(self.state.files)
        self.file_listbox.selection_clear(0, tk.END)
        self.file_listbox.selection_set(idx)
        self.load_image(idx)

    # ----------------------------- canvas / cropping -------------------------

    def on_canvas_press(self, event):
        self.state.crop_start = (event.x, event.y)
        if self.state.crop_rect_id is not None:
            self.canvas_orig.delete(self.state.crop_rect_id)
            self.state.crop_rect_id = None

    def on_canvas_drag(self, event):
        if not self.state.crop_start:
            return
        x0, y0 = self.state.crop_start
        x1, y1 = event.x, event.y
        if self.state.crop_rect_id is None:
            self.state.crop_rect_id = self.canvas_orig.create_rectangle(
                x0, y0, x1, y1, outline="yellow", width=2
            )
        else:
            self.canvas_orig.coords(self.state.crop_rect_id, x0, y0, x1, y1)
        self.state.crop_box_canvas = (x0, y0, x1, y1)
        self.update_preview()

    def on_canvas_release(self, event):
        pass

    def canvas_to_image_coords(self, x, y) -> Tuple[int, int]:
        if not self.state.current_image or not self.state.canvas_size_orig:
            return 0, 0
        img_w, img_h = self.state.current_image.size
        disp_w, disp_h = self.state.canvas_size_orig
        canvas_w = self.canvas_orig.winfo_width() or disp_w
        canvas_h = self.canvas_orig.winfo_height() or disp_h

        x0 = (canvas_w - disp_w) // 2
        y0 = (canvas_h - disp_h) // 2

        x_clamped = min(max(x, x0), x0 + disp_w)
        y_clamped = min(max(y, y0), y0 + disp_h)

        rel_x = x_clamped - x0
        rel_y = y_clamped - y0
        scale_x = img_w / disp_w
        scale_y = img_h / disp_h
        img_x = int(rel_x * scale_x)
        img_y = int(rel_y * scale_y)
        return img_x, img_y

    def get_crop_box_image_coords(self) -> Optional[Tuple[int, int, int, int]]:
        if not self.state.crop_box_canvas:
            return None
        x0c, y0c, x1c, y1c = self.state.crop_box_canvas
        x0i, y0i = self.canvas_to_image_coords(x0c, y0c)
        x1i, y1i = self.canvas_to_image_coords(x1c, y1c)
        x1i, x2i = sorted((x0i, x1i))
        y1i, y2i = sorted((y0i, y1i))
        if x2i <= x1i or y2i <= y1i:
            return None
        return (x1i, y1i, x2i, y2i)

    # -------------------------- rotation helpers -----------------------------

    def get_rotation_degrees(self) -> float:
        mode = self.rotation_mode_var.get()
        if mode == "None":
            return 0.0
        if mode == "90":
            return 90.0
        if mode == "180":
            return 180.0
        if mode == "270":
            return 270.0
        # Custom
        try:
            return float(self.rotation_custom_var.get())
        except Exception:
            return 0.0

    def set_rotation_ui_from_degrees(self, deg: float):
        # Normalize to [0,360)
        d = deg % 360
        if abs(d) < 0.01 or abs(d - 360) < 0.01:
            self.rotation_mode_var.set("None")
            self.rotation_custom_var.set(0.0)
        elif abs(d - 90) < 0.01:
            self.rotation_mode_var.set("90")
        elif abs(d - 180) < 0.01:
            self.rotation_mode_var.set("180")
        elif abs(d - 270) < 0.01:
            self.rotation_mode_var.set("270")
        else:
            self.rotation_mode_var.set("Custom")
            self.rotation_custom_var.set(deg)

    def rotation_changed(self):
        """
        When rotation changes, we need to rebuild the original and preview,
        and reset the crop (since the coordinates are no longer valid).
        """
        self.state.crop_start = None
        if self.state.crop_rect_id is not None:
            self.canvas_orig.delete(self.state.crop_rect_id)
            self.state.crop_rect_id = None
        self.state.crop_box_canvas = None
        self.rebuild_original_and_preview(reset_crop=True)

    # -------------------------- actions & options ----------------------------

    def apply_action(self, action_name: str):
        """
        Apply an action preset by updating the checkboxes/params to match.
        """
        opts = self.gather_options_from_ui(include_crop=False)
        apply_action_preset(opts, action_name)

        # Sync UI from modified options (except crop)
        self.color_var.set(opts.color_correction)

        self.sigmoidal_var.set(opts.sigmoidal)
        self.sig_contrast_var.set(opts.sigmoidal_contrast)
        self.sig_midpoint_var.set(opts.sigmoidal_midpoint)

        self.sharpen_var.set(opts.sharpen)
        self.sharp_radius_var.set(opts.sharpen_radius)
        self.sharp_amount_var.set(opts.sharpen_amount)
        self.sharp_thresh_var.set(opts.sharpen_threshold)

        self.gray_var.set(opts.grayscale)
        self.invert_var.set(opts.invert)
        self.background_var.set(opts.use_background)
        self.background_scale_var.set(opts.background_scale)

        self.rebuild_original_and_preview(reset_crop=False)

    def gather_options_from_ui(self, include_crop: bool = True) -> EditOptions:
        """
        Construct an EditOptions instance from current UI state.
        """
        crop_box = self.get_crop_box_image_coords() if include_crop else None

        opts = EditOptions(
            crop_box=crop_box,
            rotation_degrees=self.get_rotation_degrees(),
            color_correction=self.color_var.get(),
            sigmoidal=self.sigmoidal_var.get(),
            sigmoidal_contrast=self.sig_contrast_var.get(),
            sigmoidal_midpoint=self.sig_midpoint_var.get(),
            sharpen=self.sharpen_var.get(),
            sharpen_radius=self.sharp_radius_var.get(),
            sharpen_amount=self.sharp_amount_var.get(),
            sharpen_threshold=self.sharp_thresh_var.get(),
            grayscale=self.gray_var.get(),
            invert=self.invert_var.get(),
            use_background=self.background_var.get(),
            background_scale=self.background_scale_var.get(),
            annotation_text=self.annot_text.get("1.0", tk.END).strip(),
            annotation_pos=self.annot_pos_var.get(),
            annotation_size=self.annot_size_var.get(),
        )
        return opts

    def restore_options_for_file(self, path: Path) -> None:
        """
        Try to load saved options for the given file, else fall back to
        directory defaults, and update the UI.
        """
        if not self.state.directory:
            return

        saved = load_options_for_file(self.state.directory, path)
        if not saved:
            saved = load_directory_defaults(self.state.directory)
        if not saved:
            # No prior settings; leave UI as-is.
            return

        self.color_var.set(saved.color_correction)

        self.sigmoidal_var.set(saved.sigmoidal)
        self.sig_contrast_var.set(saved.sigmoidal_contrast)
        self.sig_midpoint_var.set(saved.sigmoidal_midpoint)

        self.sharpen_var.set(saved.sharpen)
        self.sharp_radius_var.set(saved.sharpen_radius)
        self.sharp_amount_var.set(saved.sharpen_amount)
        self.sharp_thresh_var.set(saved.sharpen_threshold)

        self.gray_var.set(saved.grayscale)
        self.invert_var.set(saved.invert)
        self.background_var.set(saved.use_background)
        self.background_scale_var.set(saved.background_scale)

        self.set_rotation_ui_from_degrees(saved.rotation_degrees)

        self.annot_pos_var.set(saved.annotation_pos)
        self.annot_size_var.set(saved.annotation_size)
        self.annot_text.delete("1.0", tk.END)
        if saved.annotation_text:
            self.annot_text.insert("1.0", saved.annotation_text)

    def set_directory_defaults_from_current(self):
        """
        Save the current UI options as directory defaults.
        """
        if not self.state.directory:
            messagebox.showerror("Error", "No directory selected.")
            return
        opts = self.gather_options_from_ui(include_crop=False)
        save_directory_defaults(self.state.directory, opts)
        messagebox.showinfo("Directory defaults", "Defaults saved for this directory.")

    # ---------------------- preview rendering (Pillow) -----------------------

    def rebuild_original_and_preview(self, reset_crop: bool = False):
        """
        Rebuild the rotated original and the preview from base_image + options.
        """
        if self.state.base_image is None:
            self.update_cmd_display(clear=True)
            return
        opts = self.gather_options_from_ui(include_crop=False)
        # Rotate base image according to opts
        rotated = self.state.base_image.rotate(opts.rotation_degrees, expand=True)
        self.state.current_image = rotated

        # Original view: rotated, no processing except resize
        self.display_on_canvas(self.canvas_orig, rotated, is_original=True)

        # Reset crop if asked
        if reset_crop:
            self.state.crop_box_canvas = None
            self.state.crop_start = None
            if self.state.crop_rect_id is not None:
                self.canvas_orig.delete(self.state.crop_rect_id)
                self.state.crop_rect_id = None

        # Preview: rotated + processing (including crop if present)
        self.update_preview()

    def apply_preview_effects(self, base_img: Image.Image, opts: EditOptions) -> Image.Image:
        """
        Apply a subset of the edit options in-memory to generate a preview image.
        This approximates the IM pipeline but doesn't have to be pixel-identical.

        NOTE: Rotation is already baked into base_img; we do NOT apply it again here.
        """
        img = base_img

        # Crop
        if opts.crop_box is not None:
            x1, y1, x2, y2 = opts.crop_box
            img = img.crop((x1, y1, x2, y2))

        # Grayscale
        if opts.grayscale:
            img = img.convert("L").convert("RGB")

        # Invert
        if opts.invert:
            img = ImageOps.invert(img)

        # Sharpen (approximate IM unsharp)
        if opts.sharpen:
            radius = max(0.0, float(opts.sharpen_radius))
            amount = max(0.0, float(opts.sharpen_amount))
            thresh = max(0.0, float(opts.sharpen_threshold))
            percent = int(amount * 100.0)
            threshold = int(thresh * 255.0)
            img = img.filter(ImageFilter.UnsharpMask(radius=radius or 1.0,
                                                     percent=percent or 150,
                                                     threshold=threshold))

        # Simple annotation
        if opts.annotation_text.strip():
            draw = ImageDraw.Draw(img)
            text = opts.annotation_text
            try:
                font = ImageFont.truetype("DejaVuSans.ttf", opts.annotation_size)
            except Exception:
                font = ImageFont.load_default()

            # Measure text size compatible with older Pillow
            try:
                bbox = draw.textbbox((0, 0), text, font=font)
                text_w = bbox[2] - bbox[0]
                text_h = bbox[3] - bbox[1]
            except AttributeError:
                text_w, text_h = font.getsize(text)

            w, h = img.size

            pos_name = opts.annotation_pos
            if pos_name == "Top":
                x = (w - text_w) // 2
                y = int(0.02 * h)
            elif pos_name == "Center":
                x = (w - text_w) // 2
                y = (h - text_h) // 2
            else:  # Bottom
                x = (w - text_w) // 2
                y = int(h - text_h - 0.02 * h)

            # simple text with outline
            outline = 2
            for dx in (-outline, outline):
                for dy in (-outline, outline):
                    draw.text((x + dx, y + dy), text, font=font, fill="black")
            draw.text((x, y), text, font=font, fill="white")

        # Simple granite-like background preview
        if opts.use_background:
            subject = img
            scale = max(1.0, float(opts.background_scale))
            bg_w = max(1, int(subject.width * scale))
            bg_h = max(1, int(subject.height * scale))
            try:
                noise = Image.effect_noise((bg_w, bg_h), 64)
                bg = noise.filter(ImageFilter.GaussianBlur(radius=1))
            except Exception:
                bg = Image.new("L", (bg_w, bg_h), 128)
            if opts.grayscale:
                bg = bg.convert("L")
            bg = bg.convert("RGB")
            x = (bg_w - subject.width) // 2
            y = (bg_h - subject.height) // 2
            bg.paste(subject, (x, y))
            img = bg

        return img

    def update_preview(self):
        """
        Recompute and display the preview image (processed) on the bottom canvas.
        Also updates the IM command text.
        """
        if not self.state.current_image:
            self.update_cmd_display(clear=True)
            return
        opts = self.gather_options_from_ui(include_crop=True)
        preview_img = self.apply_preview_effects(self.state.current_image.copy(), opts)
        self.display_on_canvas(self.canvas_prev, preview_img, is_original=False)
        self.update_cmd_display(clear=False)

    def options_changed(self):
        """Callback used by various controls to trigger preview update."""
        self.update_preview()

    def on_annot_modified(self, event):
        """Handle <<Modified>> event from the annotation Text widget."""
        self.annot_text.edit_modified(False)
        self.update_preview()

    # ----------------------- IM command display / copy -----------------------

    def update_cmd_display(self, clear: bool = False):
        """
        Build and show the current main ImageMagick command.

        For directories with no image selected, or clear=True, the display is emptied.

        If 'Granite background' is checked, note that a second command
        will be run on Process, but we don't synthesize that here.
        """
        if clear or not self.state.files:
            self.current_cmd_str = ""
            self.cmd_text.configure(state="normal")
            self.cmd_text.delete("1.0", tk.END)
            self.cmd_text.configure(state="disabled")
            return

        path = self.state.files[self.state.current_index]
        opts = self.gather_options_from_ui(include_crop=True)

        # Destination name (same as Process)
        dest = path.with_name(path.stem + "_edit.jpg")

        # For background, we still show the main command (first pass).
        if opts.use_background:
            tmp_subject = path.with_name(path.stem + "_tmp_subject.jpg")
            opts_main = EditOptions(
                crop_box=opts.crop_box,
                rotation_degrees=opts.rotation_degrees,
                color_correction=opts.color_correction,
                sigmoidal=opts.sigmoidal,
                sigmoidal_contrast=opts.sigmoidal_contrast,
                sigmoidal_midpoint=opts.sigmoidal_midpoint,
                sharpen=opts.sharpen,
                sharpen_radius=opts.sharpen_radius,
                sharpen_amount=opts.sharpen_amount,
                sharpen_threshold=opts.sharpen_threshold,
                grayscale=opts.grayscale,
                invert=opts.invert,
                use_background=False,
                background_scale=opts.background_scale,
                annotation_text=opts.annotation_text,
                annotation_pos=opts.annotation_pos,
                annotation_size=opts.annotation_size,
                extra_args=opts.extra_args,
            )
            cmd = build_imagemagick_cmd(path, tmp_subject, opts_main)
            cmd_str = " ".join(cmd)
            cmd_str += "\n# Note: Granite background compositing is run as a second IM command on Process."
        else:
            cmd = build_imagemagick_cmd(path, dest, opts)
            cmd_str = " ".join(cmd)

        self.current_cmd_str = cmd_str
        self.cmd_text.configure(state="normal")
        self.cmd_text.delete("1.0", tk.END)
        self.cmd_text.insert("1.0", cmd_str)
        self.cmd_text.configure(state="disabled")

    def run_im_preview(self):
        """
        Generate a preview using the *actual* ImageMagick pipeline,
        but resized down to roughly the preview canvas size for speed.

        It uses the same options as Process (including crop, rotation, etc.),
        writes to a temporary JPEG, and displays that in the Preview canvas.
        """
        if not self.state.files or self.state.base_image is None:
            return
        if not self.state.directory:
            messagebox.showerror("Error", "No directory selected.")
            return

        path = self.state.files[self.state.current_index]
        opts = self.gather_options_from_ui(include_crop=True)

        # Determine preview size from preview canvas
        canvas_w = self.canvas_prev.winfo_width() or 800
        canvas_h = self.canvas_prev.winfo_height() or 450
        resize_arg = f"{canvas_w}x{canvas_h}"

        # We'll add a "-resize WxH" at the end of the main subject command.
        # That way, all IM operations are done at preview resolution.
        opts_preview = EditOptions(
            crop_box=opts.crop_box,
            rotation_degrees=opts.rotation_degrees,
            color_correction=opts.color_correction,
            sigmoidal=opts.sigmoidal,
            sigmoidal_contrast=opts.sigmoidal_contrast,
            sigmoidal_midpoint=opts.sigmoidal_midpoint,
            sharpen=opts.sharpen,
            sharpen_radius=opts.sharpen_radius,
            sharpen_amount=opts.sharpen_amount,
            sharpen_threshold=opts.sharpen_threshold,
            grayscale=opts.grayscale,
            invert=opts.invert,
            use_background=False,  # background handled separately below
            background_scale=opts.background_scale,
            annotation_text=opts.annotation_text,
            annotation_pos=opts.annotation_pos,
            annotation_size=opts.annotation_size,
            extra_args=["-resize", resize_arg],
        )

        # Temporary files for subject and final preview
        tmp_subject = None
        tmp_preview = None
        try:
            if not opts.use_background:
                # Single-command preview
                with tempfile.NamedTemporaryFile(suffix="_impreview.jpg", delete=False) as tf:
                    tmp_preview = Path(tf.name)
                cmd = build_imagemagick_cmd(path, tmp_preview, opts_preview)
                try:
                    subprocess.run(cmd, check=True)
                except subprocess.CalledProcessError as e:
                    messagebox.showerror("IM Preview error", f"IM preview failed:\n{e}")
                    return

            else:
                # Two-step: subject + granite background
                with tempfile.NamedTemporaryFile(suffix="_subject_impreview.jpg", delete=False) as tf1:
                    tmp_subject = Path(tf1.name)
                with tempfile.NamedTemporaryFile(suffix="_impreview.jpg", delete=False) as tf2:
                    tmp_preview = Path(tf2.name)

                # 1) Subject at preview resolution
                cmd1 = build_imagemagick_cmd(path, tmp_subject, opts_preview)
                try:
                    subprocess.run(cmd1, check=True)
                except subprocess.CalledProcessError as e:
                    messagebox.showerror("IM Preview error", f"IM subject preview failed:\n{e}")
                    return

                # 2) Background + subject composite
                try:
                    with Image.open(tmp_subject) as s_img:
                        subject_size = s_img.size
                except Exception as e:
                    messagebox.showerror("IM Preview error", f"Failed to open subject preview:\n{e}")
                    return

                cmd2 = build_granite_background_cmd(tmp_subject, tmp_preview, opts, subject_size)
                try:
                    subprocess.run(cmd2, check=True)
                except subprocess.CalledProcessError as e:
                    messagebox.showerror("IM Preview error", f"IM background preview failed:\n{e}")
                    return

            # Load and display the resulting preview JPEG
            if tmp_preview and tmp_preview.exists():
                try:
                    with Image.open(tmp_preview) as im_prev:
                        im_prev = im_prev.convert("RGB")
                        self.display_on_canvas(self.canvas_prev, im_prev, is_original=False)
                except Exception as e:
                    messagebox.showerror("IM Preview error", f"Failed to load preview image:\n{e}")

        finally:
            # Clean up temp files
            try:
                if tmp_subject and tmp_subject.exists():
                    tmp_subject.unlink()
            except Exception:
                pass
            try:
                if tmp_preview and tmp_preview.exists():
                    tmp_preview.unlink()
            except Exception:
                pass

        
    def copy_cmd_to_clipboard(self):
        if not self.current_cmd_str:
            return
        self.clipboard_clear()
        self.clipboard_append(self.current_cmd_str)
        self.update()  # make sure clipboard is updated

    # -------------------------- processing (IM) ------------------------------

    def process_current(self):
        if not self.state.files:
            return
        path = self.state.files[self.state.current_index]
        if not self.state.directory:
            messagebox.showerror("Error", "Internal error: no directory set.")
            return

        opts = self.gather_options_from_ui(include_crop=True)
        dest = path.with_name(path.stem + "_edit.jpg")

        use_bg = opts.use_background
        if not use_bg:
            cmd = build_imagemagick_cmd(path, dest, opts)
            if not self.confirm_and_run(cmd):
                return
        else:
            tmp_subject = path.with_name(path.stem + "_tmp_subject.jpg")

            # First pass: main edits, no background
            opts_main = EditOptions(
                crop_box=opts.crop_box,
                rotation_degrees=opts.rotation_degrees,
                color_correction=opts.color_correction,
                sigmoidal=opts.sigmoidal,
                sigmoidal_contrast=opts.sigmoidal_contrast,
                sigmoidal_midpoint=opts.sigmoidal_midpoint,
                sharpen=opts.sharpen,
                sharpen_radius=opts.sharpen_radius,
                sharpen_amount=opts.sharpen_amount,
                sharpen_threshold=opts.sharpen_threshold,
                grayscale=opts.grayscale,
                invert=opts.invert,
                use_background=False,
                background_scale=opts.background_scale,
                annotation_text=opts.annotation_text,
                annotation_pos=opts.annotation_pos,
                annotation_size=opts.annotation_size,
                extra_args=opts.extra_args,
            )

            cmd1 = build_imagemagick_cmd(path, tmp_subject, opts_main)
            if not self.confirm_and_run(cmd1):
                return

            # Determine subject size for background scaling
            try:
                with Image.open(tmp_subject) as s_img:
                    subject_size = s_img.size
            except Exception as e:
                messagebox.showerror("Error", f"Failed to open temp subject:\n{e}")
                return

            cmd2 = build_granite_background_cmd(tmp_subject, dest, opts, subject_size)
            if not self.confirm_and_run(cmd2):
                return

            # Optionally clean up tmp_subject
            try:
                tmp_subject.unlink()
            except Exception:
                pass

        # On success, save the options for this file
        save_options_for_file(self.state.directory, path, opts)
        messagebox.showinfo("Done", f"Created {dest.name}")

    def confirm_and_run(self, cmd: List[str]) -> bool:
        """
        Ask for confirmation, then run the given command.
        Returns True on success, False on failure or cancel.
        """
        if not messagebox.askyesno(
            "Run ImageMagick",
            "About to run:\n\n" + " ".join(cmd) + "\n\nProceed?",
        ):
            return False
        try:
            subprocess.run(cmd, check=True)
            return True
        except subprocess.CalledProcessError as e:
            messagebox.showerror("Error", f"Processing failed:\n{e}")
            return False


# ------------------------------- main ---------------------------------------


def main():
    app = WImageEditTk()
    app.mainloop()


if __name__ == "__main__":
    main()