import csv
import argparse

import numpy as np
from PIL import Image
from sklearn.svm import SVC
from joblib import dump, load


def load_image_as_vector(path):
    img = Image.open(path).convert('L')
    arr = np.array(img)
    return arr.flatten()



parser = argparse.ArgumentParser()

parser.add_argument("--mode", required=True)
parser.add_argument("--dataset")
parser.add_argument("--model", required=True)
parser.add_argument("--input")
parser.add_argument("--output")


args = parser.parse_args()

if args.mode == "train":
    dataset_csv = args.dataset
    model_path = args.model

    paths = []
    labels = []

    with open(dataset_csv, newline="") as f:
        reader = csv.reader(f)
        header = next(reader)

        for row in reader:
            path = row[0]
            label = row[1]
            paths.append(path)
            labels.append(label)


    X_list = []
    Y_list = []


    for path, label in zip(paths, labels):
        vec = load_image_as_vector(path)
        X_list.append(vec)
        Y_list.append(label)

    X = np.array(X_list)
    Y = np.array(Y_list)


    model = SVC(kernel="rbf", gamma="scale")
    model.fit(X, Y)


    dump(model, model_path)

elif args.mode == "inference":
    model_path = args.model
    input_csv = args.input
    output_csv = args.output

    model = load(model_path)

    paths = []

    with open(input_csv, newline="") as f:
        reader = csv.reader(f)
        header = next(reader)

        for row in reader:
            path = row[0]
            paths.append(path)

    X_list = []

    for path in paths:
        vec = load_image_as_vector(path)
        X_list.append(vec)

    X = np.array(X_list)

    preds = model.predict(X)

    with open(output_csv, 'w', newline="") as f:
        writer = csv.writer(f)
        writer.writerow(['path', 'label'])
        for path, label in zip(paths, preds):
            writer.writerow([path, label])