import re


def extract_income_limit(text):
    """
    Extract income limit from eligibility text.
    Returns integer value in INR.
    """

    patterns = [
        r"family income.*?₹?\s*([\d,]+)",
        r"annual income.*?₹?\s*([\d,]+)",
        r"income should not exceed.*?₹?\s*([\d,]+)",
        r"income below.*?₹?\s*([\d,]+)",
        r"income less than.*?₹?\s*([\d,]+)",
        r"income.*?₹?\s*([\d,]+)"
    ]

    for pattern in patterns:

        match = re.search(
            pattern,
            text,
            re.IGNORECASE
        )

        if match:

            value = (
                match.group(1)
                .replace(",", "")
            )

            try:
                return int(value)
            except:
                pass

    return None


def extract_age_limit(text):
    """
    Extract age range if available.
    """

    patterns = [
        r'(\d+)\s*[-–]\s*(\d+)\s*years',
        r'age.*?between\s*(\d+)\s*and\s*(\d+)',
        r'(\d+)\s*to\s*(\d+)\s*years'
    ]

    for pattern in patterns:

        match = re.search(
            pattern,
            text,
            re.IGNORECASE
        )

        if match:

            return {
                "min": int(match.group(1)),
                "max": int(match.group(2))
            }

    return None


def extract_categories(text):
    """
    Detect reservation categories.
    """

    categories = [
        "SC",
        "ST",
        "OBC",
        "EWS",
        "Minority",
        "General",
        "PWD",
        "Disabled"
    ]

    found = []

    for category in categories:

        if category.lower() in text.lower():
            found.append(category)

    return found


def check_eligibility(
    master_json,
    income
):
    """
    Main eligibility checker.
    """

    eligibility_text = master_json.get(
        "eligibility",
        ""
    )

    income_limit = extract_income_limit(
        eligibility_text
    )

    age_rule = extract_age_limit(
        eligibility_text
    )

    categories = extract_categories(
        eligibility_text
    )

    result_lines = []

    result_lines.append(
        "📋 Eligibility Analysis"
    )

    result_lines.append("")

    if income_limit:

        result_lines.append(
            f"💰 Income Limit: ₹{income_limit:,}"
        )

    else:

        result_lines.append(
            "💰 Income Limit: Not Found"
        )

    if age_rule:

        result_lines.append(
            f"🎂 Age Requirement: {age_rule['min']} - {age_rule['max']} years"
        )

    else:

        result_lines.append(
            "🎂 Age Requirement: Not Found"
        )

    if categories:

        result_lines.append(
            f"🏷 Category: {', '.join(categories)}"
        )

    else:

        result_lines.append(
            "🏷 Category: Open"
        )

    result_lines.append("")
    result_lines.append("Result:")

    if income_limit:

        if income <= income_limit:

            result_lines.append(
                "✅ Eligible (Income Criteria Satisfied)"
            )

        else:

            result_lines.append(
                "❌ Not Eligible (Income Exceeds Limit)"
            )

    else:

        result_lines.append(
            "⚠ Unable to verify eligibility automatically."
        )

    return "\n".join(
        result_lines
    )