"""! @file main.py
@brief Main file for the application
@author xlanro00
"""

# Import libraries
import argparse as ap
import json
import numpy as np
import matplotlib.pyplot as plt

# Import custom image filter library
import filters as flt

class app:
    def __init__(self):
        self.parse_arguments()
        self.input_file = self.args.input_file
        self.output_file = self.args.output_file
        self.img = plt.imread(self.input_file)
        self.dpi = self.args.dpi
        self.filters = self.args.filters
        self.apply_filters()

    def parse_arguments(self):
        parser = ap.ArgumentParser(prog='main.py', description='loads and stores image')
        parser.add_argument("-i", "--input_file", help="Input file", required=True)
        parser.add_argument("-o", "--output_file", help="Output file", required=True)
        parser.add_argument('-d', "--dpi", type=int, required=True)
        #parser.add_argument( '-s', '--size')
        parser.add_argument('filters', type=str, nargs='*')
        self.args = parser.parse_args()

    def filter_factory(self, filter_name):
        if filter_name == "average":
            return flt.filter_average
        elif filter_name == "blur":
            return flt.filter_blur
        elif filter_name == "gaussian":
            return flt.filter_gaussian
        else:
            raise ValueError("Invalid filter name")

    def apply_filters(self):
        for filter in self.filters:
            filter = self.filter_factory(filter)
            filter.apply(self)
        self.save_image()

    def save_image(self):
        # Save processed image
        plt.savefig(self.output_file)

app = app()