87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
# cost_calculator.py
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import os
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from PyPDF2 import PdfReader
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from pdf2image import convert_from_path
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import numpy as np
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UPLOAD_FOLDER = "data/uploads"
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ALLOWED_EXTENSIONS = {"pdf"}
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def allowed_file(filename: str) -> bool:
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return "." in filename and filename.rsplit(".", 1)[1].lower() in ALLOWED_EXTENSIONS
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def points_to_meters(points: float) -> float:
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return (points / 72.0) * 0.0254
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def get_rate_black() -> float:
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return float(os.environ.get("RATE_PER_M2_BLACK", "4.0"))
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def get_rate_color() -> float:
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return float(os.environ.get("RATE_PER_M2_COLOR", "5.0"))
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def analyze_pdf(path, compute_ink=True):
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reader = PdfReader(path)
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pages_info = []
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total_area_black = total_area_color = 0.0
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total_cost_black = total_cost_color = 0.0
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for i, page in enumerate(reader.pages):
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box = page.mediabox
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width_m = points_to_meters(float(box.width))
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height_m = points_to_meters(float(box.height))
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area = width_m * height_m
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ink_pct = None
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is_color = False
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if compute_ink:
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try:
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images = convert_from_path(path, first_page=i + 1, last_page=i + 1, dpi=150)
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img = images[0].convert("RGB")
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arr = np.array(img)
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# ink pixels: any channel < 240
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ink_mask = np.any(arr < 240, axis=2)
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ink_pct = float(np.count_nonzero(ink_mask)) / (arr.shape[0] * arr.shape[1]) * 100.0
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# simple color detection: if RGB channels differ significantly
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avg_rgb = arr.mean(axis=(0, 1))
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if np.ptp(avg_rgb) > 30:
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is_color = True
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except Exception as e:
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print(f"Page {i+1} ink/color calc failed: {e}")
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ink_pct = None
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if is_color:
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rate = get_rate_color()
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total_area_color += area
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total_cost_color += area * rate
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else:
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rate = get_rate_black()
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total_area_black += area
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total_cost_black += area * rate
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pages_info.append({
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"page": i + 1,
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"width_m": width_m,
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"height_m": height_m,
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"area_m2": area,
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"ink_pct": ink_pct,
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"is_color": is_color,
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"cost": round(area * rate, 2)
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})
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return {
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"filename": os.path.basename(path),
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"pages": pages_info,
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"total_area_black": total_area_black,
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"total_area_color": total_area_color,
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"total_cost_black": round(total_cost_black, 2),
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"total_cost_color": round(total_cost_color, 2),
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"grand_total": round(total_cost_black + total_cost_color, 2)
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}
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