commit 8f379f3b6966db492cdc417829ca2300a75ceef9
Author: lukas <lukas.heiligenbrunner@gmail.com>
Date:   Thu Mar 17 19:12:52 2022 +0100

    init

diff --git a/ex2.py b/ex2.py
new file mode 100644
index 0000000..377466c
--- /dev/null
+++ b/ex2.py
@@ -0,0 +1,157 @@
+import os.path
+from enum import Enum
+from glob import glob
+from typing import TextIO
+
+import PIL
+from PIL import Image, ImageStat
+
+
+def mkdirIfNotExists(path: str):
+    if not os.path.isdir(path):
+        print(f"creating folder: {path}")
+        os.makedirs(path)
+
+
+def validSuffix(file: str) -> bool:
+    return file.endswith((".jpg", ".jpeg", ".JPG"))
+
+
+def validFileSize(file: str) -> bool:
+    return os.path.getsize(file) < 250_000
+
+
+class ErrorCodes(Enum):
+    Extension = 1
+    FileSize = 2
+    InvalidImage = 3
+    ImageShape = 4
+    VarianceLZero = 5
+    Duplicate = 6
+
+
+def log(filename: str, errorCode: ErrorCodes):
+    print(f"[{filename}] :: {errorCode}")
+
+
+class Singleton(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        if cls not in cls._instances:
+            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
+
+
+class FileLogger(metaclass=Singleton):
+    file: TextIO or None = None
+
+    def init(self, log_file_path: str):
+        self.file = open(log_file_path, 'a')
+
+    def close(self):
+        self.file.close()
+
+    def log(self, filename: str, errorcode: ErrorCodes):
+        self.file.write(f"{filename},{errorcode.value}\n")
+
+
+def openImage(path: str) -> PIL.Image.Image or None:
+    try:
+        return Image.open(path)
+    except (FileNotFoundError, PIL.UnidentifiedImageError, ValueError, TypeError) as e:
+        return None
+
+
+def validImageShape(img: PIL.Image.Image) -> bool:
+    # check read mode of channels
+    if img.mode != "RGB":
+        return False
+
+    # check if nr and order of channels is correct
+    if img.getbands() != ('R', 'G', 'B'):
+        return False
+
+    # check if file format is jepeg
+    if img.format != "JPEG":
+        return False
+
+    # check if height and length is > 96
+    if img.height <= 96 or img.width <= 96:
+        return False
+
+    return True
+
+
+def validVariance(img: PIL.Image.Image) -> bool:
+    variances = ImageStat.Stat(img).var
+    # variance cannot be negative!
+    return min(variances) > .0
+
+
+def processFile(f: str):
+    # check suffix
+    if not validSuffix(f):
+        log(f, ErrorCodes.Extension)
+        FileLogger().log(f, ErrorCodes.Extension)
+        return
+
+    # check file size
+    if not validFileSize(f):
+        log(f, ErrorCodes.FileSize)
+        FileLogger().log(f, ErrorCodes.FileSize)
+        return
+
+    img = openImage(f)
+    if img is None:
+        log(f, ErrorCodes.InvalidImage)
+        FileLogger().log(f, ErrorCodes.InvalidImage)
+        return
+
+    if not validImageShape(img):
+        log(f, ErrorCodes.ImageShape)
+        FileLogger().log(f, ErrorCodes.ImageShape)
+        return
+
+    if not validVariance(img):
+        log(f, ErrorCodes.VarianceLZero)
+        FileLogger().log(f, ErrorCodes.VarianceLZero)
+        return
+
+    # lets copy the image data
+    # todo check if image has already be copied
+
+    # close image
+    img.close()
+
+
+def findFiles(path: str) -> [str]:
+    files = glob(path + '/**/*', recursive=True)
+    print(files)
+
+    # sort filenames
+    files.sort()
+
+    for f in files:
+        processFile(f)
+
+
+def validate_images(input_dir: str, output_dir: str, log_file: str, formatter: str or None = None):
+    # check if out_put dir exists
+    mkdirIfNotExists(output_dir)
+
+    # check if logfile dir exists
+    logdir = os.path.dirname(log_file)
+    mkdirIfNotExists(logdir)
+
+    # init file logger
+    FileLogger().init(log_file)
+
+    # scan input dir for files
+    findFiles(input_dir)
+    pass
+
+
+# Press the green button in the gutter to run the script.
+if __name__ == '__main__':
+    validate_images("./input", "./output", "logs/1/log.txt")
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..142cf01
--- /dev/null
+++ b/main.py
@@ -0,0 +1,7 @@
+# This is a sample Python script.
+
+# Press Umschalt+F10 to execute it or replace it with your code.
+# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.
+
+
+# See PyCharm help at https://www.jetbrains.com/help/pycharm/