From 0936802758e79372f1482f55a5268a2b2bcd44bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Szymon=20Parafin=CC=81ski?= <sparafinski@fandom.com>
Date: Sun, 22 Jan 2023 17:33:49 +0100
Subject: [PATCH] Add main.py

---
 main.py | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 main.py

diff --git a/main.py b/main.py
new file mode 100644
index 0000000..9782fa5
--- /dev/null
+++ b/main.py
@@ -0,0 +1,90 @@
+import cv2
+import pytesseract
+import fitz
+import re
+from fastapi import FastAPI, File
+
+
+DPI = 300
+ZOOM = DPI / 72
+app = FastAPI()
+
+def save_pdf(pdf_bytes):
+    file_name = "invoice.pdf"
+    binary_file = open(file_name, "wb")
+    binary_file.write(pdf_bytes)
+    binary_file.close()
+    return file_name
+
+
+def convert_pdf_to_png(file):
+    file_name = "invoice.png"
+    magnify = fitz.Matrix(ZOOM, ZOOM)
+    doc = fitz.open(file)
+    pix = doc[0].get_pixmap(matrix=magnify)
+    pix.save(file_name)
+    return file_name
+
+
+def ocr_png_file(image_name):
+    image = cv2.imread(image_name)
+    custom_config = r'-l pol --oem 3 --psm 6'
+    ocr_string = pytesseract.image_to_string(image, config=custom_config)
+    return ocr_string
+
+
+def find_vat_id(invoice_text):
+    pattern = "NIP: ([0-9])+ "
+    result = re.search(pattern, invoice_text)
+    vat_id = result.group()
+    vat_id = vat_id.replace("NIP: ", "")
+    return vat_id.strip()
+
+
+def find_seller_name(invoice_text):
+    pattern = "Nabywca:\n.*((?=sp.|spółka|S.A.|S.K.A.))"
+    result = re.search(pattern, invoice_text)
+    seller_name = result.group()
+    seller_name = seller_name.replace("Nabywca:\n", "")
+    return seller_name.strip() + " sp.z.o.o"
+
+
+def find_total_sum(invoice_text):
+    pattern_afv = "(?<=Wartość brutto )[0-9]{1,}.[0-9]{1,}(?= PLN\n)"
+    pattern_bfv = "(?<=PLN )[0-9]{1,}.[0-9]{1,}(?= PLN\n)"
+    regex_pattern = pattern_afv + "|" + pattern_bfv
+    result = re.search(regex_pattern, invoice_text)
+    total_sum = result.group()
+    total_sum = total_sum.replace("Do zapłaty:", "")
+    sum_string = total_sum.strip()
+    return float(sum_string)
+
+
+@app.post("/invoice")
+async def create_file(file: bytes = File()):
+    pdf_file = save_pdf(pdf_bytes=file)
+    png_file = convert_pdf_to_png(file=pdf_file)
+    invoice_text = ocr_png_file(image_name=png_file)
+    vat_id = find_vat_id(invoice_text=invoice_text)
+    seller_name = find_seller_name(invoice_text=invoice_text)
+    total_sum = find_total_sum(invoice_text=invoice_text)
+    json = {
+        "vat_id": vat_id,
+        "seller_name": seller_name,
+        "total": total_sum
+    }
+    return json
+
+# if __name__ == '__main__':
+#     file = "train/CFV 1_05_2021.pdf"
+#     png_file = convert_pdf_to_png(file)
+#     invoice_text = ocr_png_file(image_name=png_file)
+#     vat_id = find_vat_id(invoice_text=invoice_text)
+#     seller_name = find_seller_name(invoice_text=invoice_text)
+#     total_sum = find_total_sum(invoice_text=invoice_text)
+#     json = {
+#         "vat_id": vat_id,
+#         "seller_name": seller_name,
+#         "total": total_sum
+#     }
+#     print(json)
\ No newline at end of file