import math
import threading
from PySide2.QtWidgets import QWidget
from PySide2.QtGui import QImage, QColor, QPainter
from PySide2.QtCore import Qt, QSize, QTimer
import binaryninjaui
from binaryninjaui import ViewFrame, UIContext
from binaryninja.enums import ThemeColor

class EntropyThread(threading.Thread):
	def __init__(self, data, image, block_size):
		super(EntropyThread, self).__init__()
		self.data = data
		self.image = image
		self.block_size = block_size
		self.updated = False

	def run(self):
		width = self.image.width()
		for i in range(0, width):
			v = int(self.data.get_entropy(self.data.start + i * self.block_size, self.block_size)[0] * 255)
			if v >= 240:
				color = binaryninjaui.getThemeColor(ThemeColor.YellowStandardHighlightColor)
				self.image.setPixelColor(i, 0, color)
			else:
				baseColor = binaryninjaui.getThemeColor(ThemeColor.FeatureMapBaseColor)
				entropyColor = binaryninjaui.getThemeColor(ThemeColor.BlueStandardHighlightColor)
				color = binaryninjaui.mixColor(baseColor, entropyColor, v)
				self.image.setPixelColor(i, 0, color)
			self.updated = True


class EntropyWidget(QWidget):
	def __init__(self, parent, view, data):
		super(EntropyWidget, self).__init__(parent)
		self.view = view
		self.data = data
		self.raw_data = data.file.raw

		self.block_size = (len(self.raw_data) / 4096) + 1
		if self.block_size < 1024:
			self.block_size = 1024
		self.width = int(len(self.raw_data) / self.block_size)
		self.image = QImage(self.width, 1, QImage.Format_ARGB32)
		self.image.fill(QColor(0, 0, 0, 0))

		self.thread = EntropyThread(self.raw_data, self.image, self.block_size)
		self.started = False

		self.timer = QTimer()
		self.timer.timeout.connect(self.timerEvent)
		self.timer.setInterval(100)
		self.timer.setSingleShot(False)
		self.timer.start()

		self.setMinimumHeight(UIContext.getScaledWindowSize(32, 32).height())

	def paintEvent(self, event):
		p = QPainter(self)
		p.drawImage(self.rect(), self.image)
		p.drawRect(self.rect())

	def sizeHint(self):
		return QSize(640, 32)

	def timerEvent(self):
		if not self.started:
			self.thread.start()
			self.started = True
		if self.thread.updated:
			self.thread.updated = False
			self.update()

	def mousePressEvent(self, event):
		if event.button() != Qt.LeftButton:
			return
		frac = float(event.x()) / self.rect().width()
		offset = int(frac * self.width * self.block_size)
		self.view.navigateToFileOffset(offset)