const rangeStringToArray = (str) => {
    // Split the string by hyphen
    const parts = str.split ("-");
    // Validate input format (two numbers separated by hyphen)
    if (parts.length !== 2 || isNaN (parts[0]) || isNaN (parts[1])) {
        return null; // Return null for invalid format
    }
    // Convert strings to numbers
    const start = parseInt (parts[0], 10);
    const end = parseInt (parts[1], 10);
    // Check if start is less than or equal to end (inclusive range)
    if (start > end) {
        return null; // Return null for invalid range
    }
    // Use Array.from() to create an array with sequence
    return Array.from ({ length: end - start + 1 }, (_, i) => start + i);
};

const resolveRange = (str) => {
    const numberSets = str.split (","); // Split by commas
    const numbers = [];
    for (const set of numberSets) {
        // Check if it's a range
        if (set.includes ("-")) {
            const range = rangeStringToArray (set); // Use the previous function
            if (range) {
                numbers.push(...range); // Spread operator to add elements from range array
            }
            else {
                const num = parseInt(set, 10);
                // Check if conversion is successful (valid number)
                if (!isNaN(num)) {
                    numbers.push(num);
                }
            }
        }
    }
    return numbers;
}

module.exports = {
    checkAuth: (rules = []) => {
        var authorised = false;
        if (rules.length > 0) {
            var now = new Date ();
            var minuteOfDay = (now.getHours () * 60) + now.getMinutes (); // 0 - 1439
            var day = now.getDay (); // 1 - 7
            var date = now.getDate (); // 1 - 31
            var month = now.getMonth () + 1; // 1 - 12
            var actions = [];
            rules.forEach ((rule) => {
                var valid = false;
                // Process rule
                var r = {
                    startMinute: parseInt (rule.startTime.split (":")[0] * 60) + parseInt (rule.startTime.split (":")[1]),
                    endMinute: parseInt (rule.endTime.split (":")[0] * 60) + parseInt (rule.endTime.split (":")[1]),
                    days: resolveRange (rule.weekdays),
                    dates: resolveRange (rule.dates),
                    months: resolveRange (rule.months)
                }
                if (
                    minuteOfDay >= r.startMinute && 
                    minuteOfDay <= r.endMinute &&
                    r.days.indexOf (day) !== -1 &&
                    r.dates.indexOf (date) !== -1 &&
                    r.months.indexOf (month) !== -1
                ) {
                    actions.push (rule.action.toLowerCase ());
                }
            });
            if (actions.indexOf ("allow")) {
                authorised = true;
            }
            if (actions.indexOf ("deny")) {
                authorised = false;
            }
        }
        return authorised;
    }
}