/***
 * Payment Cycle Generator
 *
 * @param gov
 * @constructor
 */
function PaymentCycle(gov, provider, prefix) {
    var self = this;

    this.network = gov.network;
    this.provider = provider;
    this.prefix = prefix;
    this.paymentCycle = 16616;
    this.proposalMaturity = 1662; // ~(60*24*3)/2.6 = about three days
    this.budgetCycles = 24;

    this.selectedStartIndex = 0;
    this.selectedPeriods = 1;

    if (this.network == 'testnet') this.paymentCycle = 23;
    if (this.network == 'testnet') this.proposalMaturity = 24; // a little more than one hour
    if (this.network == 'testnet') this.budgetCycles = 99;

    this.blockHeight = 0;

    this.startDate = [];
    this.endDate = [];

    this.Messages = {
        paymentCycle: {
            payment: "Payment",
            payments: "Payments",
            months: "Months",
            month: "Month",
            days: "Days",
            day: "Day",
            hours: "Hours",
            hour: "Hour",
            minutes: "Minutes",
            minute: "Minute",
            seconds: "Seconds",
            second: "Second"
        }
    };

    this.getInfo(function(err, res) {
        self.blockHeight = res.info.blocks;
        console.log("current blockheight: " + self.blockHeight);

        self.updateDropdowns();
    });
}

PaymentCycle.prototype.getNextSuperblock = function(block) {
    return (Math.floor((block/this.paymentCycle)) * this.paymentCycle + this.paymentCycle);
};

PaymentCycle.prototype.getBlockTimestamp = function(block) {
    var blocks = block - this.blockHeight;
    var now = Math.floor(Date.now());

    return (now + (blocks * (155 * 1000))); // 155 seconds per block x 1000 = ms per block
};

PaymentCycle.prototype.getTimeDifference = function(opts, start, end) {

    var precision = opts.precision;

    var millisec = end - start;

    var seconds = (millisec / 1000).toFixed(precision);

    var minutes = (millisec / (1000 * 60)).toFixed(precision);

    var hours = (millisec / (1000 * 60 * 60)).toFixed(precision);

    var days = (millisec / (1000 * 60 * 60 * 24)).toFixed(precision);

    var months = (millisec / (1000 * 60 * 60 * 24 * 30)).toFixed(precision);

    if (seconds < 60) {
        if (seconds <= 1) return seconds + " " + this.Messages.paymentCycle.second; // singular
        return seconds + " " + this.Messages.paymentCycle.seconds;
    } else if (minutes < 60) {
        if (minutes <= 1) return minutes + " " + this.Messages.paymentCycle.minute; // singular
        return minutes + " " + this.Messages.paymentCycle.minutes;
    } else if (hours < 24) {
        if (hours <= 1) return hours + " " + this.Messages.paymentCycle.hour; // singular
        return hours + " " + this.Messages.paymentCycle.hours;
    } else if (days < 30) {
        if (days <= 1) return days + " " + this.Messages.paymentCycle.day; // singular
        return days + " " + this.Messages.paymentCycle.days;
    } else {
        if (months <= 1) return months + " " + this.Messages.paymentCycle.month; // singular
        return months + " " + this.Messages.paymentCycle.months;
    }
};

PaymentCycle.prototype.updateDropdowns = function() {
    var self = this;

    var blockHeight = this.blockHeight;
    var now = Math.floor(Date.now());

    for (i = 0; i < this.budgetCycles + 1; i++) {

        var superblock = this.getNextSuperblock(blockHeight);
        var timestamp = this.getBlockTimestamp(superblock);

        var before = this.getBlockTimestamp((superblock-(this.paymentCycle/2))); // set start_epoch to halfway before superblock
        var after = this.getBlockTimestamp((superblock+(this.paymentCycle/2))); // set end_epoch to halfway after superblock

        var votingDeadline = this.getBlockTimestamp((superblock-this.proposalMaturity)); // if superblock is within ~3 days skip to the next one

        var label = new Date(timestamp).toLocaleDateString();
        if (this.network == 'testnet') label += " @ " + new Date(timestamp).toLocaleTimeString();

        var superblockDate = {
            superblock: superblock,
            timestamp: timestamp,
            before: before,
            after: after,
            label: label
        };

        // include superblock if proposal maturity date is later than now
        if (votingDeadline > now) {
            this.startDate.push(superblockDate);
            this.endDate.push(superblockDate);
        }

        blockHeight = superblock;

    }

    // this.endDate.shift(); // remove first element of endDate
    // this.startDate.pop(); // remove last element of startDate to keep length even

    var opts = {
        precision: 2
    }; // 2 unit of precision for eta formatting

    // calculate the amount of time between start and stop, show: e.g. 5 Months or 5 Hours

    var start_epoch = $("#start_epoch");
    start_epoch.find('option').remove();
    $.each(this.startDate, function(index) {

        var eta = self.getTimeDifference(opts, now, this.timestamp);
        var time = this.timestamp - now;
        var option = $("<option />").val((Math.floor(this.before / 1000))).text(this.label).attr('data-index', index).attr('data-time', time).attr('data-eta', eta).attr('data-block', this.superblock);
        start_epoch.append(option);

    });

    self.updateEndEpoch();

};

PaymentCycle.prototype.updateEndEpoch = function() {
    var self = this;

    var opts = {
        precision: null
    }; // 0 units of precision for eta formatting

    var end_epoch = $("#end_epoch");
    end_epoch.find('option').remove();

    var i = 1;
    var payments = self.Messages.paymentCycle.payment;

    $.each(this.endDate, function(index) {

        if(index >= self.selectedStartIndex) {

            if (i > 1) payments = self.Messages.paymentCycle.payments;

            var eta = self.getTimeDifference(opts, self.startDate[self.selectedStartIndex].timestamp, this.timestamp);
            var time = this.timestamp - self.startDate[self.selectedStartIndex].timestamp;

            var option = $("<option />").val((Math.floor(this.after / 1000))).text((i+" "+payments)).attr('data-index', index).attr('data-label', this.label).attr('data-time', time).attr('data-eta', eta).attr('data-block', this.superblock);
            end_epoch.append(option);

            i++;

        }



    });

};

PaymentCycle.prototype.getInfo = function(cb) {
    $.getJSON(this.provider + this.prefix + "/status?q=getinfo", function( data ) {
        cb(null, data);
    });
};