/**********************************************************
 * ABAPGIT JS function library
 **********************************************************/

/**********************************************************
 * Polyfills
 **********************************************************/

// Bind polyfill (for IE7), taken from https://developer.mozilla.org/
if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== "function") {
      throw new TypeError("Function.prototype.bind - subject is not callable");
    }

    var aArgs   = Array.prototype.slice.call(arguments, 1),
        fToBind = this,
        fNOP    = function() {},
        fBound  = function() {
          return fToBind.apply(this instanceof fNOP
                 ? this
                 : oThis,
                 aArgs.concat(Array.prototype.slice.call(arguments)));
        };

    if (this.prototype) {
      fNOP.prototype = this.prototype; 
    }
    fBound.prototype = new fNOP();

    return fBound;
  };
}

/**********************************************************
 * Common functions
 **********************************************************/

// Output text to the debug div
function debugOutput(text, dstID) {
  var stdout       = document.getElementById(dstID || "debug-output");
  var wrapped      = "<p>" + text + "</p>";
  stdout.innerHTML = stdout.innerHTML + wrapped;
}

// Create hidden form and submit with sapevent
function submitSapeventForm(params, action) {
  var form = document.createElement("form");
  form.setAttribute("method", "post");
  form.setAttribute("action", "sapevent:" + action);
  
  for(var key in params) {
    var hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", key);
    hiddenField.setAttribute("value", params[key]);
    form.appendChild(hiddenField);
  }

  document.body.appendChild(form);
  form.submit();
}

// Set focus to a control
function setInitialFocus(id) {
  document.getElementById(id).focus();
}

// Submit an existing form
function submitFormById(id) {
  document.getElementById(id).submit();
}

// JS error stub
function errorStub(event) {
  var element    = event.target || event.srcElement;
  var targetName = element.id || element.name || "???";
  alert("JS Error, please log an issue (@" + targetName + ")");
}

// confirm JS initilization
function confirmInitialized() {
  var errorBanner = document.getElementById("js-error-banner");
  if (errorBanner) {
    errorBanner.style.display = "none";
  }
  debugOutput("js: OK"); // Final final confirmation :)
}

/**********************************************************
 * STAGE PAGE Logic
 **********************************************************/

// Stage helper constructor
function StageHelper(params) {
  this.pageSeed        = params.seed;
  this.formAction      = params.formAction;
  this.choiseCount     = 0;
  this.lastSearchValue = "";

  // DOM nodes
  this.dom = {
    stageTab:     document.getElementById(params.ids.stageTab),
    commitBtn:    document.getElementById(params.ids.commitBtn),
    commitAllBtn: document.getElementById(params.ids.commitAllBtn),
    objectSearch: document.getElementById(params.ids.objectSearch),
    fileCounter:  document.getElementById(params.ids.fileCounter)
  };
  
  // Table columns (autodetection)
  this.col = this.detectColumns();

  // Constants
  this.HIGHLIGHT_STYLE = "highlight";
  this.STATUS = {
    "add":    "A",
    "remove": "R",
    "ignore": "I",
    "reset":  "?"
  };
  
  this.setHooks();
}

// Hook global click listener on table, load/unload actions
StageHelper.prototype.setHooks = function() {
  this.dom.stageTab.onclick        = this.onTableClick.bind(this);
  this.dom.commitBtn.onclick       = this.submit.bind(this);
  this.dom.objectSearch.oninput    = this.onSearch.bind(this);
  this.dom.objectSearch.onkeypress = this.onSearch.bind(this);
  window.onbeforeunload            = this.onPageUnload.bind(this);
  window.onload                    = this.onPageLoad.bind(this);
}

// Detect column index
StageHelper.prototype.detectColumns = function() {
  var dataRow  = this.dom.stageTab.tBodies[0].rows[0];
  var cols     = {};

  for (var i = dataRow.cells.length - 1; i >= 0; i--) {
    if (dataRow.cells[i].className) cols[dataRow.cells[i].className] = i;
  }

  return cols;
}

// Store table state on leaving the page
StageHelper.prototype.onPageUnload = function() {
  if (!window.sessionStorage) return;

  var data = this.collectData();
  window.sessionStorage.setItem(this.pageSeed, JSON.stringify(data));
}

// Re-store table state on entering the page
StageHelper.prototype.onPageLoad = function() {

  var data = window.sessionStorage && JSON.parse(window.sessionStorage.getItem(this.pageSeed));

  if (data) {
    this.iterateStageTab(function (row) {
      var status = data[row.cells[this.col.name].innerText];
      this.updateRow(row, status || this.STATUS.reset);
    });
    debugOutput("StageHelper.onPageLoad from Storage");

  } else { // Render initial commands

    this.iterateStageTab(function (row) {
      this.updateRow(row, this.STATUS.reset);
    });
    debugOutput("StageHelper.onPageLoad initial state");
  }

  this.updateMenu();
}

// Table event handler, change status
StageHelper.prototype.onTableClick = function (event) {
  var target = event.target || event.srcElement;
  if (!target || target.tagName != "A") return;

  var td = target.parentNode;
  if (!td || ["TD","TH"].indexOf(td.tagName) == -1 || td.className != "cmd") return;
  
  var status    = this.STATUS[target.innerText]; // Convert anchor text to status
  var targetRow = td.parentNode;
  
  if (td.tagName === "TD") {
    this.updateRow(targetRow, status);
  } else { // TH
    this.iterateStageTab(function (row) {
      if (row.style.display !== "none"                      // Not filtered out
        && row.className === targetRow.className            // Same context as header
        ) {
        this.updateRow(row, status);
      }
    });
  }

  this.updateMenu();
}

// Search object
StageHelper.prototype.onSearch = function (e) {
  if ( // Enter hit or clear, IE SUCKS !
       e.type === "input" && !e.target.value && this.lastSearchValue
    || e.type === "keypress" && e.which === 13 ) { 

    this.lastSearchValue = e.target.value;
    this.iterateStageTab(this.applyFilterToRow, e.target.value);
  }
}

StageHelper.prototype.applyFilterToRow = function (row, filter) {
  var td      = row.cells[this.col.name];
  var origTxt = td.innerText; // without tags
  var newTxt  = "";

  if (filter) {
    newTxt = origTxt.replace(filter, "<mark>"+filter+"</mark>");
    if (newTxt !== origTxt) { // fits filter
      row.style.display = "table-row";
    } else {
      row.style.display = "none";
    }
  } else { // No filter -> just reset the value
    newTxt            = origTxt;
    row.style.display = "table-row";
  }

  if (td.firstChild.tagName === "A") {
    td.firstChild.innerHTML = newTxt;
  } else {
    td.innerHTML = newTxt;
  }
}

// Get how status should affect object counter
StageHelper.prototype.getStatusImpact = function (status) {
  if (typeof status !== "string" 
    || status.length !== 1 
    || "ARI?".indexOf(status) == -1) {
    alert("Unknown status");
  } else {
    return (status !== this.STATUS.reset) ? 1 : 0;
  }
}

// Update table line
StageHelper.prototype.updateRow = function (row, newStatus) {
  var oldStatus = row.cells[this.col.status].innerText;

  if (oldStatus !== newStatus) {
    row.cells[this.col.status].innerText = newStatus;
    if (newStatus === this.STATUS.reset) {
      row.cells[this.col.status].classList.remove(this.HIGHLIGHT_STYLE);
    } else {
      row.cells[this.col.status].classList.add(this.HIGHLIGHT_STYLE);
    }
    this.updateRowCommand(row, newStatus);
  } else if (!row.cells[this.col.cmd].innerText) {
    this.updateRowCommand(row, newStatus); // For initial run
  }

  this.choiseCount += this.getStatusImpact(newStatus) - this.getStatusImpact(oldStatus);
}

// Update command cell (render set of commands)
StageHelper.prototype.updateRowCommand = function (row, status) {
  var CMD_RESET  = "<a>reset</a>";
  var CMD_LOCAL  = "<a>add</a>";
  var CMD_REMOTE = "<a>ignore</a><a>remove</a>";

  if (status === this.STATUS.reset) {
    row.cells[this.col.cmd].innerHTML = (row.className == "local") ? CMD_LOCAL : CMD_REMOTE;
  } else {
    row.cells[this.col.cmd].innerHTML = CMD_RESET;
  }
}

// Update menu items visibility
StageHelper.prototype.updateMenu = function () {
  this.dom.commitBtn.style.display    = (this.choiseCount > 0) ? "inline" : "none";
  this.dom.commitAllBtn.style.display = (this.choiseCount > 0) ? "none" : "inline";
  this.dom.fileCounter.innerHTML      = this.choiseCount.toString();
}

// Submit stage state to the server
StageHelper.prototype.submit = function () {
  submitSapeventForm(this.collectData(), this.formAction);
}

// Extract data from the table
StageHelper.prototype.collectData = function () {
  var data  = {};
  this.iterateStageTab(function (row) {
    data[row.cells[this.col.name].innerText] = row.cells[this.col.status].innerText;
  });
  return data;
}

// table iteration helper
StageHelper.prototype.iterateStageTab = function (cb /*, ...*/) {
  for (var b = 0, bN = this.dom.stageTab.tBodies.length; b < bN; b++) {
    var tbody = this.dom.stageTab.tBodies[b];
    for (var r = 0, rN = tbody.rows.length; r < rN; r++) {
      args = [tbody.rows[r]].concat(Array.prototype.slice.call(arguments, 1));
      cb.apply(this, args); // callback
    }
  }
}