# Modules/data_collector.py

import threading
import time
import re
import sys
import numpy as np
import cv2
import pytesseract
from PIL import Image, ImageGrab, ImageFilter

from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtCore import QRect, QPoint, Qt, QMutex, QTimer
from PyQt5.QtGui import QPainter, QPen, QColor, QFont

pytesseract.pytesseract.tesseract_cmd = r"C:\Program Files\Tesseract-OCR\tesseract.exe"

DEFAULT_WIDTH = 180
DEFAULT_HEIGHT = 130
HANDLE_SIZE = 8
LABEL_HEIGHT = 20

collector_mutex = QMutex()
regions = {}

app_instance = None

def _ensure_qapplication():
    """
    Ensures that QApplication is initialized before creating widgets.
    """
    global app_instance
    if QApplication.instance() is None:
        app_instance = QApplication(sys.argv)
        threading.Thread(target=app_instance.exec_, daemon=True).start()

def create_ocr_region(region_id, x=250, y=50, w=DEFAULT_WIDTH, h=DEFAULT_HEIGHT):
    """
    Creates an OCR region with a visible, resizable box on the screen.
    """
    
    _ensure_qapplication()  # Ensure QApplication is running first

    collector_mutex.lock()
    if region_id in regions:
        collector_mutex.unlock()
        return
    regions[region_id] = {
        'bbox': [x, y, w, h],
        'raw_text': "",
        'widget': OCRRegionWidget(x, y, w, h, region_id)
    }
    collector_mutex.unlock()

def get_raw_text(region_id):
    collector_mutex.lock()
    if region_id not in regions:
        collector_mutex.unlock()
        return ""
    text = regions[region_id]['raw_text']
    collector_mutex.unlock()
    return text

def start_collector():
    t = threading.Thread(target=_update_ocr_loop, daemon=True)
    t.start()

def _update_ocr_loop():
    while True:
        collector_mutex.lock()
        region_ids = list(regions.keys())
        collector_mutex.unlock()

        for rid in region_ids:
            collector_mutex.lock()
            bbox = regions[rid]['bbox'][:]
            collector_mutex.unlock()

            x, y, w, h = bbox
            screenshot = ImageGrab.grab(bbox=(x, y, x + w, y + h))
            processed = _preprocess_image(screenshot)
            raw_text = pytesseract.image_to_string(processed, config='--psm 4 --oem 1')

            collector_mutex.lock()
            if rid in regions:
                regions[rid]['raw_text'] = raw_text
            collector_mutex.unlock()

#            print(f"OCR Text for {rid}: {raw_text}") # SHOW RAW OCR OUTPUT IN TERMINAL FOR DEBUGGING

        time.sleep(0.7)

def _preprocess_image(image):
    gray = image.convert("L")
    scaled = gray.resize((gray.width * 3, gray.height * 3))
    thresh = scaled.point(lambda p: 255 if p > 200 else 0)
    return thresh.filter(ImageFilter.MedianFilter(3))

class OCRRegionWidget(QWidget):
    def __init__(self, x, y, w, h, region_id):
        super().__init__()

        self.setGeometry(x, y, w, h)
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.Tool)
        self.setAttribute(Qt.WA_TranslucentBackground, True)
        self.setAttribute(Qt.WA_TransparentForMouseEvents, False)

        self.drag_offset = None
        self.selected_handle = None
        self.region_id = region_id

        self.show()

    def paintEvent(self, event):
        painter = QPainter(self)
        pen = QPen(QColor(0, 0, 255))
        pen.setWidth(3)
        painter.setPen(pen)

        # Draw main rectangle
        painter.drawRect(0, 0, self.width(), self.height())

        # Draw resize handles
        painter.setBrush(QColor(0, 0, 255))
        for handle in self._resize_handles():
            painter.drawRect(handle)

    def _resize_handles(self):
        w, h = self.width(), self.height()
        return [
            QRect(0, 0, HANDLE_SIZE, HANDLE_SIZE),  # Top-left
            QRect(w - HANDLE_SIZE, h - HANDLE_SIZE, HANDLE_SIZE, HANDLE_SIZE)  # Bottom-right
        ]

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            for i, handle in enumerate(self._resize_handles()):
                if handle.contains(event.pos()):
                    self.selected_handle = i
                    return

            self.drag_offset = event.pos()

    def mouseMoveEvent(self, event):
        if self.selected_handle is not None:
            w, h = self.width(), self.height()
            if self.selected_handle == 0:  # Top-left
                new_w = w + (self.x() - event.globalX())
                new_h = h + (self.y() - event.globalY())
                new_x = event.globalX()
                new_y = event.globalY()
                if new_w < 20: new_w = 20
                if new_h < 20: new_h = 20
                self.setGeometry(new_x, new_y, new_w, new_h)
            elif self.selected_handle == 1:  # Bottom-right
                new_w = event.globalX() - self.x()
                new_h = event.globalY() - self.y()
                if new_w < 20: new_w = 20
                if new_h < 20: new_h = 20
                self.setGeometry(self.x(), self.y(), new_w, new_h)

            collector_mutex.lock()
            if self.region_id in regions:
                regions[self.region_id]['bbox'] = [self.x(), self.y(), self.width(), self.height()]
            collector_mutex.unlock()

            self.update()
        elif self.drag_offset:
            new_x = event.globalX() - self.drag_offset.x()
            new_y = event.globalY() - self.drag_offset.y()
            self.move(new_x, new_y)

            collector_mutex.lock()
            if self.region_id in regions:
                regions[self.region_id]['bbox'] = [new_x, new_y, self.width(), self.height()]
            collector_mutex.unlock()

    def mouseReleaseEvent(self, event):
        self.selected_handle = None
        self.drag_offset = None