var matlab_javascript_epoch = 719529.0;


function matlab_to_date(days) { 
    days = days - matlab_javascript_epoch;
    return new Date(days*3600*24*1000) }
function date_to_matlab(date) {
    return date.getTime()/(3600.*24.*1000.) + matlab_javascript_epoch;}

//var lookup_table = [
//		    ["ADCP02_NW_Dep5_DA_023.mat", true, false, false, true, 735793.72222, 735794.0625], 
//		    ["ADCP02_NW_Dep5_DA_024.mat", true, true, false, false, 735794.72222, 735795.0625], 
//		    ["ADCP02_NW_Dep5_DA_025.mat", true, false, false, true, 735795.72222, 735796.0625], 
//		    ["ADCP02_NW_Dep5_DA_026.mat", false, true, false, false, 735796.72222, 735797.0625], 
//		    ];

function instrument(filename) {
    var inst = filename.substr(0,3);
    if (inst == "ADC") { return "ADCP";};
    if (inst == "SBD") { return "SBD";};
    if (inst == "CON") { return "CONT";};
    if (inst == "AWA") { return "AWAC";};
    return "";     
	};


function file_name(inst, file_number, product_type, format) {
	var filename = inst + "_" + product_type + "_" + file_number + format;
        return filename
	};                 

function file_url(inst_type, inst, file_number, product_type, format) {
    if (format == ".mat") {format_dir = "matlab_format"};
    if (format == ".nc") {format_dir = "netcdf_format"};
    //filename = "http://data.ukedc.rl.ac.uk/browse/edc/renewables/marine/redapt/matlab_format/QC/ADCP/ADCP01_NW_Dep0/ADCP01_NW_Dep0_QC_001.mat";
    filename = "http://data.ukedc.rl.ac.uk/browse/edc/renewables/marine/redapt/data/";
    filename += format_dir + "/" + product_type + "/" + inst_type + "/" + inst + "/";
    filename += file_name(inst, file_number, product_type, format);
    return filename
};

function report_error(message) {
    var errors_div = $( "#errors" );
    errors_div.empty();
    errors_div.html(message);
};

function search(){
    report_error("");
    var results_div = $( "#results" );
    results_div.empty();
    // get info from input fields
    // dates 
    // flags
    var startdate = $( "#startdate" ).val();
    var enddate = $( "#enddate" ).val();
    if (startdate) {startdate = date_to_matlab(new Date(startdate))};
    if (enddate) {enddate = date_to_matlab(new Date(enddate))};
    if (startdate && enddate && startdate > enddate) {report_error("Start date must be before end date"); return};
    var adcp = $( "#adcp" ).is(':checked');
    var sbd = $( "#sbd" ).is(':checked');
    var awac = $( "#awac" ).is(':checked');
    var cont = $( "#cont" ).is(':checked');
    var flood = $( "#flood" ).is(':checked');
    var ebb = $( "#ebb" ).is(':checked');
    var facing_flood = $( "#facing_flood" ).is(':checked');
    var facing_ebb = $( "#facing_ebb" ).is(':checked');
    var turbine_on = $( "#turbine_on" ).is(':checked');
    var turbine_off = $( "#turbine_off" ).is(':checked');
    if ($( "#matlab" ).is(':checked')) {var format = ".mat"} else {var format = ".nc"}; 
    if ($( "#RAW" ).is(':checked')) {var product_type = "RAW"}
    else if ($( "#DA" ).is(':checked')) {var product_type = "DA"}
    else {var product_type = "QC"}; 
    // examine each line in the table to see if it matches
    // print result
    var result = [];
    for (var i = 0; i < lookup_table.length; i++) {
	//       console.log(startdate, lookup_table[i][6]);
        //console.log(enddate, lookup_table[i][5])
	if (startdate && startdate > lookup_table[i][10]) { continue };  //skip if start date greater than rec end date
	if (enddate && enddate < lookup_table[i][9]) { continue };  //skip if end date less than rec start date
        if (flood && !lookup_table[i][3]) { continue };  //skip flood records
	if (ebb && !lookup_table[i][4]) { continue };  //skip ebb records
	if (facing_flood && !lookup_table[i][5]) { continue };  //skip facing flood records
        if (facing_ebb && !lookup_table[i][6]) { continue };  //skip facing ebb records
        if (turbine_on && !lookup_table[i][7]) { continue };  //skip turbine on records
        if (turbine_off && !lookup_table[i][8]) { continue };  //skip turbine off records
        if (!adcp && lookup_table[i][0] == "ADCP") {continue };   //skip if ADCP and box not ticked
        if (!cont && lookup_table[i][0] == "CONT") {continue };   //skip if CONT and box not ticked
        if (!sbd && lookup_table[i][0] == "SBD") {continue };   //skip if SBD and box not ticked
        if (!awac && lookup_table[i][0] == "AWAC") {continue };   //skip if AWAC and box not ticked
        
        result.push(lookup_table[i])
    };    
    var text = "Search results: "+ result.length +" files."
    text += ' <table class="table table-striped"><tr><th>File</th><th>Flood tide</th><th>Ebb tide</th><th>Turbine facing flood</th>';
    text += '<th>Turbine facing ebb</th><th>Trubine on</th><th>Trubine off</th><th>Start time</th><th>End time</th></tr>';
    for (i = 0; i < result.length; i++) {
        var filename = file_name(result[i][1], result[i][2], product_type, format);
        var url = file_url(result[i][0], result[i][1], result[i][2], product_type, format) 
        text += "<tr>";
        text += '<td><a href="' + url + '">' + filename + "</a></td>";
        text += "<td>" + result[i][3] + "</td>";
        text += "<td>" + result[i][4] + "</td>";
        text += "<td>" + result[i][5] + "</td>";
        text += "<td>" + result[i][6] + "</td>";
        text += "<td>" + result[i][7] + "</td>";
        text += "<td>" + result[i][8] + "</td>";
        text += "<td>" + matlab_to_date(result[i][9]).toISOString() + "</td>";
        text += "<td>" + matlab_to_date(result[i][10]).toISOString() + "</td>";
        text += "</tr>";
    };
    text += "</table>"
	console.log("Update search");
    results_div.html(text);
};

$(document).ready(search);