from pathlib import Path
from glob import glob

from PIL import Image
import matplotlib.pylab as plt
from matplotlib.widgets import Button

from image_preparing import fix_image_resolution
import transition


class ImageInterface:
	def __init__(self, base_dir=None):
		self.base_dir = Path(base_dir or Path(__file__).resolve().parent.parent)
		self.image_sets = {
			"source": self._load_images(str(self.base_dir / "images" / "source" / "*.png")),
			"goal": self._load_images(str(self.base_dir / "images" / "goal" / "*.png")),
			"shenanigans": self._load_images(str(self.base_dir / "images" / "shenanigans" / "*.png")),
		}
		self.current_category = None
		self.current_index = 0
		self.selected_indices = {"source": None, "goal": None}
		self.figure = None
		self.image_axis = None
		self.list_axis = None
		self.buttons = []
		self.key_connection_id = None
		self.colors = {
			"figure": "#111111",
			"panel": "#1a1a1a",
			"text": "#f2f2f2",
			"button": "#2b2b2b",
			"button_hover": "#3a3a3a",
		}
	def _load_images(self, pattern):
		return sorted(glob(pattern))
	def _ensure_figure(self):
		if self.figure is None:
			self.figure = plt.figure(figsize=(10, 6))
			self.key_connection_id = self.figure.canvas.mpl_connect("key_press_event", self._on_key_press)
	def _clear_layout(self):
		self._ensure_figure()
		self.figure.clf()
		self.image_axis = None
		self.list_axis = None
		self.buttons = []
	def _make_button(self, rect, label, callback):
		button_axis = self.figure.add_axes(rect)
		button_axis.set_facecolor(self.colors["button"])
		button_axis.tick_params(left=False, labelleft=False, bottom=False, labelbottom=False)
		button = Button(button_axis, label, color=self.colors["button"], hovercolor=self.colors["button_hover"])
		button.label.set_color(self.colors["text"])
		button.on_clicked(callback)
		self.buttons.append(button)
		return button
	def _open_image(self, image_paths, index):
		if not image_paths:
			return None
		safe_index = max(0, min(index, len(image_paths) - 1))
		return Image.open(image_paths[safe_index])
	def _draw_image_panel(self, axis, image, title):
		axis.clear()
		axis.set_title(title)
		axis.set_facecolor(self.colors["panel"])
		axis.axis("off")
		axis.title.set_color(self.colors["text"])
		if image is not None:
			axis.imshow(image)
		else:
			axis.text(0.5, 0.5, "No images found", ha="center", va="center", color=self.colors["text"])
	def _draw_list_panel(self, axis, image_paths, current_index):
		axis.clear()
		axis.set_facecolor(self.colors["panel"])
		axis.axis("off")
		axis.set_title("Images")
		axis.title.set_color(self.colors["text"])
		if not image_paths:
			axis.text(0.5, 0.5, "No images found", ha="center", va="center", color=self.colors["text"])
			return
		lines = []
		for index, image_path in enumerate(image_paths):
			name = Path(image_path).name
			prefix = "> " if index == current_index else "  "
			lines.append(f"{prefix}{name}")
		axis.text(0.02, 0.98, "\n".join(lines), ha="left", va="top", family="monospace", color=self.colors["text"])
		axis.title.set_color(self.colors["text"])
	def _show_menu(self):
		self.current_category = None
		self._clear_layout()
		self.figure.patch.set_facecolor(self.colors["figure"])
		self._menu_row(0.66, "Source Images", "source", lambda event: self._open_category("source"))
		self._menu_row(0.50, "Goal Images", "goal", lambda event: self._open_category("goal"))
		self._make_button([0.08, 0.34, 0.32, 0.12], "Shenanigans Image", lambda event: self._open_shenanigans())
		self.figure.canvas.draw_idle()
	def _open_category(self, category):
		self.current_category = category
		self.current_index = 0
		self._show_browser()
	def _open_shenanigans(self):
		src_paths = self.image_sets.get("source", [])
		goal_paths = self.image_sets.get("goal", [])
		if not src_paths or not goal_paths:
			return
		sel_src = self.selected_indices.get("source")
		sel_goal = self.selected_indices.get("goal")
		src_path = src_paths[sel_src] if sel_src is not None else src_paths[0]
		goal_path = goal_paths[sel_goal] if sel_goal is not None else goal_paths[0]
		try:
			import importlib
			importlib.reload(transition)
		except Exception:
			pass
		if not hasattr(transition, "transform_images"):
			return
		transition.transform_images(src_path, goal_path)
	def _selected_image_name(self, category):
		selected_index = self.selected_indices.get(category)
		image_paths = self.image_sets.get(category, [])
		if selected_index is None or not image_paths:
			return None
		safe_index = max(0, min(selected_index, len(image_paths) - 1))
		return Path(image_paths[safe_index]).name
	def _menu_label(self, base_label, category=None):
		if category is None:
			return base_label
		selected_name = self._selected_image_name(category)
		if selected_name is None:
			return base_label
		return f"{base_label} - {selected_name}"
	def _menu_row(self, y, label, category, callback):
		self._make_button([0.08, y, 0.32, 0.12], label, callback)
		selected_name = self._selected_image_name(category)
		if selected_name is not None:
			self.figure.text(0.44, y + 0.055, f"- {selected_name}", color=self.colors["text"], va="center", ha="left", fontsize=11)
	def _select_current_image(self):
		if self.current_category in ("source", "goal"):
			self.selected_indices[self.current_category] = self.current_index
			self._show_menu()
	def _close_interface(self):
		if self.figure is not None:
			plt.close(self.figure)
	def _show_browser(self):
		self._clear_layout()
		self.figure.patch.set_facecolor(self.colors["figure"])
		self.figure.suptitle(self.current_category.replace("_", " ").title(), fontsize=16, color=self.colors["text"])
		self.image_axis, self.list_axis = self.figure.subplots(1, 2, gridspec_kw={"width_ratios": [3, 1]})
		self._refresh_browser_view()
		self._make_button([0.02, 0.02, 0.12, 0.06], "Back", lambda event: self._show_menu())
		if self.current_category in ("source", "goal"):
			self._make_button([0.76, 0.10, 0.18, 0.06], "Select", lambda event: self._select_current_image())
			self._make_button([0.76, 0.02, 0.08, 0.06], "<", lambda event: self.previous_image())
			self._make_button([0.86, 0.02, 0.08, 0.06], ">", lambda event: self.next_image())
		self.figure.subplots_adjust(left=0.05, right=0.95, bottom=0.12, top=0.90, wspace=0.22)
		self.figure.canvas.draw_idle()
	def _refresh_browser_view(self):
		images = self.image_sets.get(self.current_category, [])
		current_image = self._open_image(images, self.current_index)
		category_title = self.current_category.replace("_", " ").title() if self.current_category else "Images"
		self._draw_image_panel(self.image_axis, current_image, f"{category_title} {self.current_index + 1}/{max(len(images), 1)}")
		self._draw_list_panel(self.list_axis, images, self.current_index)
		self.figure.canvas.draw_idle()
	def _step_image(self, delta):
		images = self.image_sets.get(self.current_category, [])
		if images:
			self.current_index = (self.current_index + delta) % len(images)
			self._refresh_browser_view()
	def next_image(self):
		self._step_image(1)
	def previous_image(self):
		self._step_image(-1)
	def _on_key_press(self, event):
		if self.current_category is None:
			if event.key in ("escape", "q"):
				self._close_interface()
			return
		if event.key in ("right", "d"):
			self.next_image()
		elif event.key in ("left", "a"):
			self.previous_image()
		elif event.key == "escape":
			self._show_menu()
	def render(self):
		self._show_menu()
		plt.show()

def launch_interface():
	interface = ImageInterface()
	interface.render()
