"use strict";

var optionResults;

$(document).ready(function() {

    $("#option-terms").on("submit", function(e) {
        //
        e.preventDefault();
        sendRequest();
    })
});

function serializeForm(id) {
    //
    return $(id).serializeArray()
        .reduce(function(a, x) { a[x.name] = x.value; return a; }, {});
}

function sendRequest() {
    //
    var inputData = serializeForm("#option-terms");
    // Get the right data-types
    inputData.ExpiryDate = new Date(inputData.ExpiryDate).toJSON();
    inputData.OptType = parseInt(inputData.OptType);
    inputData.Rfr = parseFloat(inputData.Rfr);
    inputData.Sims = parseInt(inputData.Sims);
    inputData.Spot = parseFloat(inputData.Spot);
    inputData.Strike = parseFloat(inputData.Strike);
    inputData.ValueDate = new Date(inputData.ValueDate).toJSON();
    inputData.Vol = parseFloat(inputData.impliedVol);

    // Send request
    var startTime;
    $.ajax({
        type:           "POST",
        url:            "http://localhost:8080",
        data:           JSON.stringify(inputData),
        beforeSend:     function(request, settings) {
            startTime = new Date().getTime();
        },
        success:        function(e) {
            optionResults = e;
            updateTable();
            updateGraph();
            let requestTime = new Date().getTime() - startTime;
            console.log("Request time(s):", requestTime / 1000);
        },
    });
}

function updateTable() {
    // TODO
    $("#results-table > tbody > tr").each(function(idx, el) {
        $($(el).children()[1])[0].innerText =
            optionResults["ClosedForm"][$($(el).children()[0]).text()].toFixed(4);
        $($(el).children()[2])[0].innerText =
            optionResults["MonteCarlo"][$($(el).children()[0]).text()].toFixed(4);
    });
}

function updateGraph() {
    // TODO
    var strippedData = optionResults.MonteCarlo.Levels.map(function(i) {
        return Number(i.toFixed(0));
    });

    // Count the elements
    var counts = {};
    var minY = 0;
    for (var i=0; i<strippedData.length; i++) {
        var num = strippedData[i];
        counts[num] = counts[num] ? counts[num] + 1 : 1;
    }

    var summaryData = [];
    Object.keys(counts).forEach( function(key) {
        summaryData.push({'key': key, 'value': counts[key]});
    });

    var margin = {top: 10, right: 20, bottom: 20, left: 40},
    width = 500 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;

    $("#right-upper").empty();
    var svg = d3.select("#right-upper").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
        .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    var x = d3.scaleLinear()
        .range([0, width]);

    var y = d3.scaleLinear()
        .range([height, 0]);

    x.domain([0, Math.max.apply(null, strippedData)]).nice();
    var maxY = Object.values(counts).sort((prev, next) => next - prev)[0];
    y.domain([0, maxY]).nice();

    svg.selectAll(".bin")
        .data(summaryData)
        .enter().append("line")
        .attr("class", "bin")
        .attr("x1", function(d) { return x(d.key) })
        .attr("x2", function(d) { return x(d.key) })
        .attr("y1", height)
        .attr("y2", function(d) { return y(d.value ) });

    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom()
                .scale(x));

    svg.append("g")
        .attr("class", "y axis")
        .call(d3.axisLeft()
                .scale(y));

    var logNormalLine = d3.line()
        .x(function(d, i) { return x(d); })
        .y(function(d) { return logNormal(d, 100, 0.4); })
        .curve(d3.curveBasis);

    svg.append("g")
        .attr("d", logNormalLine(d3.range(x.domain()[0], x.domain()[1], 1)))
        .attr("stroke", "blue")
        .attr("stroke-width", 2)
        .attr("fill", "none")

}

function logNormal(x, mean, stddev) {
    var y = (1 / (x * Math.sqrt(2 * Math.PI * Math.pow(stddev, 2)))) * Math.pow(Math.E, - (Math.pow(Math.log(x) - mean, 2) / (2 * Math.pow(stddev, 2))));
    // console.log('logNormal', x, mean, stddev, y);
    y = isFinite(y) ? y : 0;
    return y;
}