//===== Collection of small utilities

/*
 * Bind/Unbind events
 *
 * Usage:
 *   var el = document.getElementyById('#container');
 *   bnd(el, 'click', function() {
 *     console.log('clicked');
 *   });
 */

var bnd = function(
  d, // a DOM element
  e, // an event name such as "click"
  f  // a handler function
){
  d.addEventListener(e, f, false);
}

/*
 * Create DOM element
 *
 * Usage:
 *   var el = m('<h1>Hello</h1>');
 *   document.body.appendChild(el);
 *
 * Copyright (C) 2011 Jed Schmidt <http://jed.is> - WTFPL
 * More: https://gist.github.com/966233
 */

var m = function(
  a, // an HTML string
  b, // placeholder
  c  // placeholder
){
  b = document;                   // get the document,
  c = b.createElement("p");       // create a container element,
  c.innerHTML = a;                // write the HTML to it, and
  a = b.createDocumentFragment(); // create a fragment.

  while (                         // while
    b = c.firstChild              // the container element has a first child
  ) a.appendChild(b);             // append the child to the fragment,

  return a                        // and then return the fragment.
}

/*
 * DOM selector
 *
 * Usage:
 *   $('div');
 *   $('#name');
 *   $('.name');
 *
 * Copyright (C) 2011 Jed Schmidt <http://jed.is> - WTFPL
 * More: https://gist.github.com/991057
 */

var $ = function(
  a,                         // take a simple selector like "name", "#name", or ".name", and
  b                          // an optional context, and
){
  a = a.match(/^(\W)?(.*)/); // split the selector into name and symbol.
  return(                    // return an element or list, from within the scope of
    b                        // the passed context
    || document              // or document,
  )[
    "getElement" + (         // obtained by the appropriate method calculated by
      a[1]
        ? a[1] == "#"
          ? "ById"           // the node by ID,
          : "sByClassName"   // the nodes by class name, or
        : "sByTagName"       // the nodes by tag name,
    )
  ](
    a[2]                     // called with the name.
  )
}

/*
 * Get cross browser xhr object
 *
 * Copyright (C) 2011 Jed Schmidt <http://jed.is>
 * More: https://gist.github.com/993585
 */

var j = function(
  a // cursor placeholder
){
  for(                     // for all a
    a=0;                   // from 0
    a<4;                   // to 4,
    a++                    // incrementing
  ) try {                  // try
    return a               // returning
      ? new ActiveXObject( // a new ActiveXObject
          [                // reflecting
            ,              // (elided)
            "Msxml2",      // the various
            "Msxml3",      // working
            "Microsoft"    // options
          ][a] +           // for Microsoft implementations, and
          ".XMLHTTP"       // the appropriate suffix,
        )                  // but make sure to
      : new XMLHttpRequest // try the w3c standard first, and
  }

  catch(e){}               // ignore when it fails.
}

// dom element iterator: domForEach($(".some-class"), function(el) { ... });
function domForEach(els, fun) { return Array.prototype.forEach.call(els, fun); }

// createElement short-hand

e = function(a) { return document.createElement(a); }

// chain onload handlers

function onLoad(f) {
  var old = window.onload;
  if (typeof old != 'function') {
    window.onload = f;
  } else {
    window.onload = function() {
      old();
      f();
    }
  }
}

//===== helpers to add/remove/toggle HTML element classes

function addClass(el, cl) {
  el.className += ' ' + cl;
}
function removeClass(el, cl) {
  var cls = el.className.split(/\s+/),
      l = cls.length;
  for (var i=0; i<l; i++) {
    if (cls[i] === cl) cls.splice(i, 1);
  }
  el.className = cls.join(' ');
  return cls.length != l
}
function toggleClass(el, cl) {
  if (!removeClass(el, cl)) addClass(el, cl);
}

//===== AJAX

function ajaxReq(method, url, ok_cb, err_cb, data) {
  var xhr = j();
  xhr.open(method, url, true);
  var timeout = setTimeout(function() {
    xhr.abort();
    console.log("XHR abort:", method, url);
    xhr.status = 599;
    xhr.responseText = "request time-out";
  }, 9000);
  xhr.onreadystatechange = function() {
    if (xhr.readyState != 4) { return; }
    clearTimeout(timeout);
    if (xhr.status >= 200 && xhr.status < 300) {
//      console.log("XHR done:", method, url, "->", xhr.status);
      ok_cb(xhr.responseText);
    } else {
      console.log("XHR ERR :", method, url, "->", xhr.status, xhr.responseText, xhr);
      err_cb(xhr.status, xhr.responseText);
    }
  }
//  console.log("XHR send:", method, url);
  try {
    xhr.send(data);
  } catch(err) {
    console.log("XHR EXC :", method, url, "->", err);
    err_cb(599, err);
  }
}

function dispatchJson(resp, ok_cb, err_cb) {
  var j;
  try { j = JSON.parse(resp); }
  catch(err) {
    console.log("JSON parse error: " + err + ". In: " + resp);
    err_cb(500, "JSON parse error: " + err);
    return;
  }
  ok_cb(j);
}

function ajaxJson(method, url, ok_cb, err_cb) {
  ajaxReq(method, url, function(resp) { dispatchJson(resp, ok_cb, err_cb); }, err_cb);
}

function ajaxSpin(method, url, ok_cb, err_cb) {
  $("#spinner").removeAttribute('hidden');
  ajaxReq(method, url, function(resp) {
      $("#spinner").setAttribute('hidden', '');
      ok_cb(resp);
    }, function(status, statusText) {
      $("#spinner").setAttribute('hidden', '');
      //showWarning("Error: " + statusText);
      err_cb(status, statusText);
    });
}

function ajaxJsonSpin(method, url, ok_cb, err_cb) {
  ajaxSpin(method, url, function(resp) { dispatchJson(resp, ok_cb, err_cb); }, err_cb);
}

//===== main menu, header spinner and notification boxes

function hidePopup(el) {
    addClass(el, "popup-hidden");
    addClass(el.parentNode, "popup-target");
}

onLoad(function() {
  var l = $("#layout");
  var o = l.childNodes[0];
  // spinner
  l.insertBefore(m('<div id="spinner" class="spinner" hidden></div>'), o);
  // notification boxes
  l.insertBefore(m(
    '<div id="messages"><div id="warning" hidden></div><div id="notification" hidden></div></div>'), o);
  // menu hamburger button
  l.insertBefore(m('<a href="#menu" id="menuLink" class="menu-link"><span></span></a>'), o);
  // menu left-pane
  var mm = m(
   '<div id="menu">\
      <div class="pure-menu">\
        <a class="pure-menu-heading" href="https://github.com/jeelabs/esp-link">\
        <img src="/favicon.ico" height="32">&nbsp;esp-link</a>\
        <div class="pure-menu-heading system-name" style="padding: 0px 0.6em"></div>\
        <ul id="menu-list" class="pure-menu-list"></ul>\
      </div>\
    </div>\
    ');
  l.insertBefore(mm, o);

  // make hamburger button pull out menu
  var ml = $('#menuLink'), mm = $('#menu');
  bnd(ml, 'click', function (e) {
//    console.log("hamburger time");
      var active = 'active';
      e.preventDefault();
      toggleClass(l, active);
      toggleClass(mm, active);
      toggleClass(ml, active);
  });

  // hide pop-ups
  domForEach($(".popup"), function(el) {
    hidePopup(el);
  });

  // populate menu via ajax call
  var getMenu = function() {
    ajaxJson("GET", "/menu", function(data) {
      var html = "", path = window.location.pathname;
      for (var i=0; i<data.menu.length; i+=2) {
        var href = data.menu[i+1];
        html = html.concat(" <li class=\"pure-menu-item" +
            (path === href ? " pure-menu-selected" : "") + "\">" +
            "<a href=\"" + href + "\" class=\"pure-menu-link\">" +
            data.menu[i] + "</a></li>");
      }
      $("#menu-list").innerHTML = html;

      var v = $("#version");
      if (v != null) { v.innerHTML = data.version; }

      $('title')[0].innerHTML = data["name"];
      setEditToClick("system-name", data["name"]);
    }, function() { setTimeout(getMenu, 1000); });
  };
  getMenu();
});

//===== Wifi info

function showWifiInfo(data) {
  Object.keys(data).forEach(function(v) {
    el = $("#wifi-" + v);
    if (el != null) {
      if (el.nodeName === "INPUT") el.value = data[v];
      else el.innerHTML = data[v];
    }
  });
  var dhcp = $('#dhcp-r'+data.dhcp);
  if (dhcp) dhcp.click();
  $("#wifi-spinner").setAttribute("hidden", "");
  $("#wifi-table").removeAttribute("hidden");
  currAp = data.ssid;
}

function getWifiInfo() {
  ajaxJson('GET', "/wifi/info", showWifiInfo,
      function(s, st) { window.setTimeout(getWifiInfo, 1000); });
}

//===== Telnet info

function showTelnetInfo(data) {
  Object.keys(data).forEach(function(v) {
    setEditToClick("telnet-"+v, data[v]);
  });
  $("#telnet-spinner").setAttribute("hidden", "");
  $("#telnet-table").removeAttribute("hidden");
  currAp = data.ssid;
}

function getTelnetInfo() {
  ajaxJson('GET', "/telnet/info", showTelnetInfo,
      function(s, st) { window.setTimeout(getTelnetInfo, 1000); });
}

//===== System info

function showSystemInfo(data) {
  Object.keys(data).forEach(function(v) {
    setEditToClick("system-"+v, data[v]);
  });
  $("#system-spinner").setAttribute("hidden", "");
  $("#system-table").removeAttribute("hidden");
  currAp = data.ssid;
}

function getSystemInfo() {
  ajaxJson('GET', "/system/info", showSystemInfo,
      function(s, st) { window.setTimeout(getSystemInfo, 1000); });
}

function makeAjaxInput(klass, field) {
  domForEach($("."+klass+"-"+field), function(div) {
    var eon = $(".edit-on", div);
    var eoff = $(".edit-off", div)[0];
    var url = "/"+klass+"/update?"+field;

    if (eoff === undefined || eon == undefined) return;

    var enableEditToClick = function() {
      eoff.setAttribute('hidden','');
      domForEach(eon, function(el){ el.removeAttribute('hidden'); });
      eon[0].select();
      return false;
    }

    var submitEditToClick = function(v) {
//      console.log("Submit POST "+url+"="+v);
      ajaxSpin("POST", url+"="+v, function() {
        domForEach(eon, function(el){ el.setAttribute('hidden',''); });
        eoff.removeAttribute('hidden');
        setEditToClick(klass+"-"+field, v)
        showNotification(field + " changed to " + v);
      }, function() {
        showWarning(field + " change failed");
      });
      return false;
    }

    bnd(eoff, "click", function(){return enableEditToClick();});
    bnd(eon[0], "blur", function(){return submitEditToClick(eon[0].value);});
    bnd(eon[0], "keyup", function(ev){
      if ((ev||window.event).keyCode==13) return submitEditToClick(eon[0].value);
    });
  });
}

function setEditToClick(klass, value) {
  domForEach($("."+klass), function(div) {
    if (div.children.length > 0) {
      domForEach(div.children, function(el) {
        if (el.nodeName === "INPUT") el.value = value;
        else if (el.nodeName !== "DIV") el.innerHTML = value;
      });
    } else {
      div.innerHTML = value;
    }
  });
}

//===== Notifications

function showWarning(text) {
  var el = $("#warning");
  el.innerHTML = text;
  el.removeAttribute('hidden');
  window.scrollTo(0, 0);
}
function hideWarning() {
  el = $("#warning").setAttribute('hidden', '');
}
var notifTimeout = null;
function showNotification(text) {
  var el = $("#notification");
  el.innerHTML = text;
  el.removeAttribute('hidden');
  if (notifTimeout != null) clearTimeout(notifTimeout);
  notifTimout = setTimeout(function() {
      el.setAttribute('hidden', '');
      notifTimout = null;
    }, 4000);
}

//===== GPIO Pin mux card

var pinPresets = {
  // array: reset, isp, conn, ser, swap, rxpup
  "esp-01":       [  0, -1, 2, -1, 0, 1 ],
  "esp-12":       [ 12, 14, 0,  2, 0, 1 ],
  "esp-12 swap":  [  1,  3, 0,  2, 1, 1 ],
  "esp-bridge":   [ 12, 13, 0, 14, 0, 0 ],
  "wifi-link-12": [  1,  3, 0,  2, 1, 0 ],
};

function createPresets(sel) {
  for (var p in pinPresets) {
    var opt = m('<option value="' + p + '">' + p + '</option>');
    sel.appendChild(opt);
  }

  function applyPreset(v) {
    var pp = pinPresets[v];
    if (pp === undefined) return pp;
//    console.log("apply preset:", v, pp);
    function setPP(k, v) { $("#pin-"+k).value = v; };
    setPP("reset", pp[0]);
    setPP("isp",   pp[1]);
    setPP("conn",  pp[2]);
    setPP("ser",   pp[3]);
    setPP("swap",  pp[4]);
    $("#pin-rxpup").checked = !!pp[5];
    sel.value = 0;
  };

  bnd(sel, "change", function(ev) {
    ev.preventDefault();
    applyPreset(sel.value);
  });
}

function displayPins(resp) {
  function createSelectForPin(name, v) {
    var sel = $("#pin-"+name);
    addClass(sel, "pure-button");
    sel.innerHTML = "";
    [-1,0,1,2,3,4,5,12,13,14,15].forEach(function(i) {
      var opt = document.createElement("option");
      opt.value = i;
      if (i >= 0) opt.innerHTML = "gpio"+i;
      else opt.innerHTML = "disabled";
      if (i===1) opt.innerHTML += "/TX0";
      if (i===2) opt.innerHTML += "/TX1";
      if (i===3) opt.innerHTML += "/RX0";
      if (i==v) opt.selected = true;
      sel.appendChild(opt);
    });
    var pup = $(".popup", sel.parentNode);
    if (pup !== undefined) hidePopup(pup[0]);
  };

  createSelectForPin("reset", resp["reset"]);
  createSelectForPin("isp", resp["isp"]);
  createSelectForPin("conn", resp["conn"]);
  createSelectForPin("ser", resp["ser"]);
  $("#pin-swap").value = resp["swap"];
  $("#pin-rxpup").checked = !!resp["rxpup"];
  createPresets($("#pin-preset"));

  $("#pin-spinner").setAttribute("hidden", "");
  $("#pin-table").removeAttribute("hidden");
}

function fetchPins() {
  ajaxJson("GET", "/pins", displayPins, function() {
    window.setTimeout(fetchPins, 1000);
  });
}

function setPins(ev) {
  ev.preventDefault();
  var url = "/pins";
  var sep = "?";
  ["reset", "isp", "conn", "ser", "swap"].forEach(function(p) {
    url += sep + p + "=" + $("#pin-"+p).value;
    sep = "&";
  });
  url += "&rxpup=" + ($("#pin-rxpup").checked ? "1" : "0");
//  console.log("set pins: " + url);
  ajaxSpin("POST", url, function() {
    showNotification("Pin assignment changed");
  }, function(status, errMsg) {
    showWarning(errMsg);
    window.setTimeout(fetchPins, 100);
  });
}
