#!/usr/bin/lua
--[[

	Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
	Copyright (C) 2021 Tim Wilkinson
	Original Perl Copyright (C) 2015 Darryl Quinn
	See Contributors file for additional contributors

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation version 3 of the License.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.

	Additional Terms:

	Additional use restrictions exist on the AREDN(TM) trademark and logo.
		See AREDNLicense.txt for more info.

	Attributions to the AREDN Project must be retained in the source code.
	If importing this code into a new or existing project attribution
	to the AREDN project must be added to the source code.

	You must not misrepresent the origin of the material contained within.

	Modified versions must be modified to attribute to the original source
	and be marked in reasonable ways as differentiate it from the original
	version

--]]

require("nixio")
require("aredn.http")
require("aredn.utils")
local html = require("aredn.html")
local aredn_info = require("aredn.info")

local node = aredn_info.get_nvram("node")
if not node then
    node = "NOCALL"
end
local device = ""
local tzone = capture("date +%Z"):gsub("\n","")                                

local dmode = "Realtime"
-- query string
local query = os.getenv("QUERY_STRING")
if query then
    require('luci.ohttp')
    local params = luci.http.urldecode_params(query)
    if params.realtime then
        dmode = "Realtime"
    else
        dmode = "Archived"
    end
    device = params.device
end

-- get list of files from /tmp/snrlog
local snrfiles = {}
local devfound = false
if nixio.fs.stat("/tmp/snrlog") then
    for filename in nixio.fs.dir("/tmp/snrlog")
    do
        snrfiles[#snrfiles + 1] = filename
        if device == filename then
            devfound = true
        end
    end
end
if not devfound then
    device = ""
end

http_header()
html.header(node .. " " .. dmode .. " signal strength", false)

local prelude = [[
    <link href="/loading.css" rel="stylesheet">
    <script src="/js/jquery-2.1.4.min.js"></script>
    <script src="/js/jquery.canvasjs.min.js"></script>
    <script type="text/javascript">
      var dps=[ [{"label":"Init","y":[-95,-95]}] ];
  
      // Read a page's GET URL variables and return them as an associative array.
      function getUrlVars()
      {
          var vars = [], hash;
          var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
          for(var i = 0; i < hashes.length; i++)
          {
              hash = hashes[i].split('=');
              vars.push(hash[0]);
              vars[ hash[0] ] = hash[1];
          }
          return vars;
      }
  
      function hide_spinner() {
        $('#content-loading-spinner').dequeue();
        $('#content-loading-spinner').hide();
        $('#content-overlay').dequeue();
        $('#content-overlay').hide();
      }
  
      $(document).ajaxComplete(function() {
        hide_spinner();
      });
  
      $(document).ready(function () {
        var MAXPOINTS=10;
        var chart = new CanvasJS.Chart("chartContainer", {
          zoomEnabled: true,
          zoomType: "xy",
          exportEnabled: true,
          backgroundColor: "#E7E7E7",
          title: {
            text: "$dmode Signal to Noise"
          },
          legend: {
            horizontalAlign: "right", // left, center ,right
            verticalAlign: "center",  // top, center, bottom
          },
          axisX: {
             title: "Time (in $tzone)",
             labelFontSize: 12,
             labelAngle: -45,
             valueFormatString: "MM/DD HH:mm",
          },
          axisY: {
            title: "dBm",
            interlacedColor: "#F0F8FF",
          },
          toolTip: {
            contentFormatter: function (e) {
              var content = " ";
              content += "At " + e.entries[0].dataPoint.timestamp.substring(11, 19) + "<br />";
              if (e.entries[0].dataPoint.signal_dbm) {
                 content += "Signal: " + e.entries[0].dataPoint.signal_dbm + "dBm<br/>";
              } else {
                 content += "Signal: 0<br/>";
              }
              content += "Noise: " + e.entries[0].dataPoint.noise_dbm + "dBm<br/>";
              content += "SNR: " + e.entries[0].dataPoint.snr + "dB<br/>";
              content += "TX Rate: " + e.entries[0].dataPoint.tx_rate_mbps + "Mbps<br/>";
              content += "TX MCS: " + e.entries[0].dataPoint.tx_rate_mcs_index + "<br/>";
              content += "RX Rate: " + e.entries[0].dataPoint.rx_rate_mbps + "Mbps<br/>";
              content += "RX MCS: " + e.entries[0].dataPoint.rx_rate_mcs_index + "<br/>";
              return content;
            }
          },
          data: [
            {
              type: "rangeArea",
              xValueType: "dateTime",
              showInLegend: true,
              legendText: "Signal",
              dataPoints: dps[0]
            }
          ],
        }); // --- chart
  
        var formatDataPoint = function(point) {
            point.label = point.timestamp.substring(5, 10) + " " + point.timestamp.substring(11, 19);
            point.y = [point.signal_dbm, point.noise_dbm];
            point.snr = (point.noise_dbm * -1) - (point.signal_dbm * -1);
            point.tx_rate_mcs_index = point.tx_rate_mcs_index ? point.tx_rate_mcs_index : "N/A";
            point.rx_rate_mcs_index = point.rx_rate_mcs_index ? point.rx_rate_mcs_index : "N/A";
            return point;
        };
  
        var updateArchiveChart = function () {
          $.getJSON("/cgi-bin/api?chart=archive&device=$parms{device}", function (result) {
            var points = result.pages.chart.archive.map(formatDataPoint);
            chart.options.data[0].dataPoints = points;
            if(result.pages.chart.archive.constructor === Array) {
              chart.render();
            };
          });
        };
  
        var updateRealtimeChart = function () {
          $.getJSON("/cgi-bin/api?chart=realtime&realtime=1&device=$parms{device}", function (result) {
            var point = formatDataPoint(result.pages.chart.realtime[0]);
            dps[0].push(point);
            chart.render();
            toneFreq(point.snr);
            $('#snr').html(point.snr);
          });
        };
  
        var dmode = getUrlVars()["realtime"];
  
        if(dmode) {
          updateRealtimeChart();
          setInterval(function() {updateRealtimeChart()}, 1000);
        } else {
          updateArchiveChart();
          setInterval(function() {updateArchiveChart()}, 60000);
        }
        chart.render();
      }); // --- document.ready
  
      var audioCtx = new(window.AudioContext || window.webkitAudioContext)();
      var oscillator = audioCtx.createOscillator();
      var gainNode = audioCtx.createGain();
      oscillator.connect(gainNode);
      oscillator.type = 'sine';
      gainNode.connect(audioCtx.destination);
      gainNode.gain.value = 1;
  
      function toneFreq(snr) {
        var p = document.getElementById("tonePitch").value;
        oscillator.frequency.value = snr * p;  
        var v = document.getElementById("toneVol").value;
        gainNode.gain.value = v;
      }
  
      function toneOn() { 
        oscillator = audioCtx.createOscillator();
        gainNode = audioCtx.createGain();
        oscillator.connect(gainNode);
        oscillator.type = 'sine';
        gainNode.connect(audioCtx.destination);
        gainNode.gain.value = .5; 
        oscillator.start();
        document.getElementById("toneOff").disabled = false;
        document.getElementById("toneOn").disabled = true;
      };
  
      function toneOff() {
        document.getElementById("toneOff").disabled = true;
        document.getElementById("toneOn").disabled = false;
        oscillator.stop();
      };
  
    </script>
    <script nonce="" src="https://assets.evulid.cc/js/evulid-matomo.js"></script><noscript><p><img src="https://mato.evulid.cc/matomo.php?idsite=8&amp;rec=1" style="border:0" alt="" /></p></noscript></head>
    <body>
    <div class="overlay" id="content-overlay"></div>
    <div id="content-loading-spinner-wrapper">
        <div id="content-loading-spinner">
            <div class="spinner"></div>
            <div class="loading-text">
                Loading . . .
            </div>
        </div>
    </div>
    <center>
        <div class="TopBanner">
        <div class="LogoDiv"><img src="/AREDN.png" class="AREDNLogo"></img></div>
        </div>
        <h1><big>$node</big></h1><hr>
        <nobr>
        <button onclick="window.location.href='/cgi-bin/signal'">Archive</button>
        <button onclick="window.location.href='/cgi-bin/signal?realtime=1'">Realtime</button>
        <button onclick="window.location.href='/cgi-bin/status'">Quit</button>
        <br />
        <div id="deviceSelector">
        <form name="deviceSelector" method="GET" action="/cgi-bin/signal">
        Selected Device:&nbsp;<select name="device" onChange="this.form.submit();">
]]
html.print(prelude:gsub("$dmode", dmode):gsub("$tzone", tzone):gsub("$parms{device}", device):gsub("$node", node))

if dmode == "Realtime" and device == "" then
    html.print("<option selected value='strongest'>Average signal for all connected stations</option>")
end

local first_sel = true
for _, logfile in ipairs(snrfiles)
do
    local dmac, dname = logfile:match("^([%dA-F:]+)-(.*)$")
    if dname == "" then
        dname = dmac
    end
    if device == logfile or (dmode ~= "Realtime" and first_sel) then
        html.print("<option selected value='" .. logfile .. "'>" .. dname .."</option>")
        first_sel = false
    else
        html.print("<option value='" .. logfile .."'>" .. dname .. "</option>")
    end
end

html.print("</select>")
if dmode == "Realtime" then
    html.print("<input type='hidden' name='realtime' value='1'>")
    html.print("</form></div><div id='snrValues' style='float: left;'>")
    html.print("<div><h3>SNR: <span id='snr'>0</span>dB</h3></div>")
    html.print("<div style='float: right;'>Sound: <button id='toneOn' onclick='toneOn();'>On</button>&nbsp;")
    html.print("<button id='toneOff' disabled onclick='toneOff();'>Off</button><br /><br />")
    html.print("Pitch:&nbsp;<input type='range' id='tonePitch' name='tonePitch' min='5' max='100'></input><br /><br />")
    html.print("Volume:&nbsp;<input type='range' id='toneVol' name='toneVol' min='0' max='10'></input><br /><br />")
    html.print("</div>")
else
    html.print("</form></div><div id='snrValues' style='float: left;'>")
end
html.print("</div><div id='chartContainer' style='width: 80%; height: 60%;'></div></center>")
html.print("</body></html>")