import matplotlib.pyplot as plt
from collections import Counter

def frequency(input_file: str):
    data = []
    frequencies = {}

    # Step 1: Read the CSV file manually
    with open(input_file, 'r') as file:
        lines = file.readlines()

    # Step 2: Parse the first line to get the headers
    headers = lines[0].strip().split(';')

    # Step 3: Parse the subsequent lines to get the data
    for line in lines[1:]:
        values = line.strip().split(';')
        row_dict = {headers[i]: values[i] for i in range(len(headers))}
        data.append(row_dict)

    # Step 4: Compute frequencies for each discrete variable
    discrete_variables = ['Street', 'Neighborhood', 'Bldg Type', 'House Style',
                          'Overall Qual', 'Overall Cond', 'Mo Sold', 'Yr Sold',
                          'Sale Type', 'Sale Condition']

    for var in discrete_variables:
        var_values = [row[var] for row in data]
        frequencies[var] = Counter(var_values)

    # Step 5: Print the frequency counts to the console
    for var, freq_dict in frequencies.items():
        print(f'Frequencies for {var}:')
        for value, count in freq_dict.items():
            print(f'{value}: {count}')
        print()  # Blank line for readability





def plot_frequency(input_file: str):
    data = []
    frequencies = {}

    # Step 1: Read the CSV file manually
    with open(input_file, 'r') as file:
        lines = file.readlines()

    # Step 2: Parse the first line to get the headers
    headers = lines[0].strip().split(';')

    # Step 3: Parse the subsequent lines to get the data
    for line in lines[1:]:
        values = line.strip().split(';')
        row_dict = {headers[i]: values[i] for i in range(len(headers))}
        data.append(row_dict)

    # Step 4: Compute frequencies for each discrete variable
    discrete_variables = ['Street', 'Neighborhood', 'Bldg Type', 'House Style',
                          'Overall Qual', 'Overall Cond', 'Mo Sold', 'Yr Sold',
                          'Sale Type', 'Sale Condition']

    for var in discrete_variables:
        var_values = [row[var] for row in data]
        frequencies[var] = Counter(var_values)

    # Step 5: Plot the frequencies using bar charts and pie charts
    for var, freq_dict in frequencies.items():
        labels = list(freq_dict.keys())
        counts = list(freq_dict.values())

        # Bar chart
        plt.figure(figsize=(10, 6))
        plt.bar(labels, counts, color='skyblue')
        plt.title(f'Bar Chart for {var}')
        plt.xlabel(var)
        plt.ylabel('Frequency')
        plt.xticks(rotation=45, ha='right')
        plt.tight_layout()
        plt.show()

        # Pie chart
        plt.figure(figsize=(8, 8))
        plt.pie(counts, labels=labels, autopct='%1.1f%%', colors=plt.cm.Paired.colors)
        plt.title(f'Pie Chart for {var}')
        plt.show()

def plot_histogram(input_file: str):
    data = []

    # Step 1: Read the CSV file manually
    with open(input_file, 'r') as file:
        lines = file.readlines()

    # Step 2: Parse the first line to get the headers
    headers = lines[0].strip().split(';')

    # Step 3: Parse the subsequent lines to get the data
    for line in lines[1:]:
        values = line.strip().split(';')
        row_dict = {headers[i]: values[i] for i in range(len(headers))}
        data.append(row_dict)

    # Step 4: Extract the "SalePrice" variable and convert it to numeric values
    sale_prices = [int(row['SalePrice']) for row in data]

    # Step 5: Plot the histogram for the "SalePrice" variable
    plt.figure(figsize=(10, 6))
    plt.hist(sale_prices, bins=20, color='skyblue', edgecolor='black')
    plt.title('Histogram of SalePrice')
    plt.xlabel('SalePrice')
    plt.ylabel('Frequency')
    plt.grid(axis='y', alpha=0.75)
    plt.tight_layout()
    plt.show()


# Example usage
#frequency('AmesHousing.csv')

# Example usage 2
#plot_frequency('AmesHousing.csv')

# Example usage 3
plot_histogram('AmesHousing.csv')