# encoding: utf-8
"""
Internal utility functions. They're intended to be used only by the methods within nodes,
so they might expect the input arguments to already be pre-validated.
"""

import typing as _t

from math import sqrt as _sqrt

from server import PromptServer as _PromptServer


_t_number = _t.Union[int, float]


def aspect_ratios_sorted(aspect_a: float, aspect_b: float, min_clamp: float = 1.0):
	"""Return aspect ratio in a standard form: 2 floats, both 1+, in descending order (16:9, not 9:16)."""
	aspect_a = float(max(abs(aspect_a), min_clamp))
	aspect_b = float(max(abs(aspect_b), min_clamp))
	return (aspect_b, aspect_a) if aspect_b > aspect_a else (aspect_a, aspect_b)


def number_to_int(value: _t.Union[int, float], min: int = 1) -> int:
	if not isinstance(value, int):
		if isinstance(value, float):
			sign = -1 if value < 0.0 else 1
			value = int(value * sign + 0.5) * sign
		else:
			value = int(value)
	return max(value, min)


def round_abs(abs_value: _t_number, step: int):
	"""
	Assuming both args are positive and ``step`` is already an int, detect the closest positive (non-zero) value
	which is also divisible by step.
	"""
	n_steps = int(float(abs_value) / step + 0.5)
	n_steps = max(n_steps, 1)
	return step * n_steps, n_steps


def round_width_and_height_closest_to_the_ratio(width_f: _t_number, height_f: _t_number, step: int):
	"""3-pass detection of the best rounded resolution. Best = closest to the desired ratio."""
	desired_width_to_height_ratio = float(width_f) / height_f

	# First pass: directly from width_f and height_f
	width, n_steps_x = round_abs(width_f, step)
	height, n_steps_y = round_abs(height_f, step)

	# Second pass: try calculating one side from already rounded another one:
	height_from_width, n_steps_y_from_x = round_abs(float(width) / desired_width_to_height_ratio, step)
	width_from_height, n_steps_x_from_y = round_abs(float(height) * desired_width_to_height_ratio, step)

	# ... and select one of three options, closest to the perfect ratio:
	closest_delta = abs((float(width) / height) - desired_width_to_height_ratio)
	for w, n_x, h, n_y in [
		(width, n_steps_x, height_from_width, n_steps_y_from_x),
		(width_from_height, n_steps_x_from_y, height, n_steps_y),
	]:
		cur_delta = abs((float(w) / h) - desired_width_to_height_ratio)
		if cur_delta < closest_delta:
			closest_delta = cur_delta
			width, n_steps_x = w, n_x
			height, n_steps_y = h, n_y

	return width, n_steps_x, height, n_steps_y


def simple_result_from_approx_wh(width_f: float, height_f: _t_number, step: int, unique_id: str = None):
	"""Final part of the main func for simple (non-upscale) nodes - when desired float/height are already calculated"""
	step = number_to_int(step)
	width, n_steps_x, height, n_steps_y = round_width_and_height_closest_to_the_ratio(width_f, height_f, step)

	square_side_f = _sqrt(float(width * height))
	square_side = int(square_side_f + 0.5)
	square_side_text = (
		f"✅={square_side}x{square_side}"
		if (square_side * square_side == width * height)
		else f"~{square_side}x{square_side}"
	)

	ar_desired = width_f / height_f
	ar_real = float(width) / height
	ar_text = (
		"AR: ✅ perfect match"
		if abs(ar_desired - ar_real) < 0.0005
		else f"AR goal/real: {ar_desired:.3f}/{ar_real:.3f}"
	)

	text = (
		f"{width} x {height} ({square_side_text})\n"
		f"{n_steps_x} * {step} x {n_steps_y} * {step}\n"
		f"{ar_text}"
	)

	if unique_id:
		# Snatched from: https://github.com/comfyanonymous/ComfyUI/blob/27870ec3c30e56be9707d89a120eb7f0e2836be1/comfy_extras/nodes_images.py#L581-L582
		_PromptServer.instance.send_progress_text(text, unique_id)

	return width, height