// ### Send query functions ###

//function to get current queryData from a given queryFormElement
function getQueryData(queryFormElement) {
  // Get query form element and save its data on submit and send this data via
  formData = new FormData(queryFormElement);
  queryData = {"context": formData.get("context"), // global declaration
               "hits_per_page": formData.get("hits_per_page"),
               "query": formData.get("query")};
  return queryData
}

// Function to send a query to the CQP server using queryData gatherd with getQueryData
function sendQuery(event) {

  // checks if one query has been finished before
  // if true result download will be disabled again until query is finished
  // also shows progress bar again
  if (queryFinished) {
    exportQueryResultsElement.classList.add("disabled");
    queryResultsDeterminateElement.parentNode.parentNode.classList.remove("hide");
  }

  event.preventDefault();
  queryData = getQueryData(queryFormElement);
  nopaque.socket.emit("corpus_analysis_query", queryData.query);
  // full results object declaration, global declaration!
  // will always be reset if a query is sent, so that only the chunks of the
  // current query will be saved in it
  result = {};
  result["matches"] = [];
  result["cpos_lookup"] = {};
  result["text_lookup"] = {};
  result["loaded_match_count"] = 0;
  result["match_count"] = 0;
  result["query"] = "";
  // some hiding/showing for loading animation
  queryLoadingElement.classList.remove("hide");
  queryResultsTableElement.classList.add("hide");
  nopaque.toast("Query has been sent!");

  resultListOptions = {page: queryData["hits_per_page"],
    pagination: [{
      name: "paginationTop",
      paginationClass: "paginationTop",
      innerWindow: 8,
      outerWindow: 1
    }, {
      paginationClass: "paginationBottom",
      innerWindow: 8,
      outerWindow: 1
    }],
    valueNames: ["titles", "lc", "hit", "rc", {data: ["index"]}],
    item: `<span class="hidden"></span>`};
    resultList = new ResultList('result-list', resultListOptions);
    resultList.clear(); // empty list for new query
}

// ### Recieve results from sent query and display them in a list etc. ###

// Function used when CQP server sends back the query results using socketio
function recieveResults(response) {

  // ERROR code checking
  if (response["code"] === 0) {
    console.log("[SUCCESS] corpus_analysis_init");
    console.log("Code:" + response["code"]);
    // further code execution of this code block starting in line 342
  } else if (response["code"] === 1) {
    queryResultsTableElement.classList.add("hide");
    queryLoadingElement.classList.add("hide");
    nopaque.toast("Invalid query entered!", "red");
    console.log("[ERROR] corpus_analysis_init");
    console.log("Code:" + response["code"]);
    return; // no further code execution of this code block
  } else {
    console.log("[ERROR] corpus_analysis_init");
    console.log("Code:" + response["code"]);
    return; // no further code execution of this code block
  }
  // logs the current recieved chunk
  chunk = {};
  chunk = response["result"];
  console.log("### corpus_analysis chunk ###");
  console.log(chunk);
  // logs and extends/push/update the current recieved chunk to the
  // result Object
  console.log("### corpus analysis updated result json ###");
  result["matches"].push(...chunk["matches"]);
  Object.assign(result["cpos_lookup"], chunk["cpos_lookup"]);
  Object.assign(result["text_lookup"], chunk["text_lookup"]);
  result["match_count"] = chunk["match_count"];
  console.log("Before Current match count", result["loaded_match_count"]);
  result["query"] = queryData["query"];
  console.log(result);
  // Some hiding and showing of loading animations
  queryLoadingElement.classList.add("hide");
  queryResultsTableElement.classList.remove("hide");
  let queryResultsElement = document.getElementById("query-results");
  queryResultsElement.innerHTML = "";

  // check if query has any results
  if (chunk["matches"].length === 0) {
    queryResultsTableElement.classList.add("hide");
    nopaque.toast("No results for this query!");
    return;
  }

  // List building/appending the chunks when query had results
  match_count = chunk["match_count"];
  let count_corpus_files = Object.keys(result["text_lookup"]).length;

  let resultItems = []; // list for holding every row item
  // get infos for full match row
  for (let [index, match] of chunk["matches"].entries()) {
    resultItems.push({...match, ...{"index": index + result["loaded_match_count"]}});
  }
  resultList.add(resultItems, items => {
    for (let item of items) {
      item.elm = resultList.createResultRowElement(item, chunk);
    }
    resultList.update();
    changeContext(); // sets lr context on first result load
  });
  result["loaded_match_count"] += Object.keys(chunk["matches"]).length;
  console.log("After current match count", result["loaded_match_count"]);
  let queryResultsMetadataElement = document.getElementById("query-results-metadata");
  queryResultsMetadataElement.innerHTML = `<p>The query resulted in a total of ${chunk["match_count"]} matches. </p> <p> ${result["loaded_match_count"]} of ${result["match_count"]} matches in ${count_corpus_files} corpus files have been loaded.<i class="material-icons" id="tool-tip-info">help</i></p>`;
  let queryResultsInteractionElement = document.getElementById("interaction-elements");
  queryResultsInteractionElement.appendChild(exportQueryResultsElement);
  let queryResultsHeadElement = document.getElementById("query-results-head");
  queryResultsHeadElement.classList.remove("hide");
  queryStatus = result["loaded_match_count"] / result["match_count"] * 100;
  console.log(queryStatus);
  queryResultsDeterminateElement.style["width"] = `${queryStatus}%`;
  console.log(queryResultsDeterminateElement.style["width"]);
  let toolTipInfoElement = document.getElementById("tool-tip-info");
  toolTipInfoElement.addEventListener("mouseover", function(event) {
    M.Tooltip.init(toolTipInfoElement, {"html": `<p>The Server is still sending you your results. Functions like "Export Results" and "Match Inspect" will be available after all matches have been loaded.</p>`,
    "inDuration": 1500,
    "margin": 15,
    "position": "top",
    "transitionMovement": 0})
  });
  // enable download and inspect when query is finished
  // also sets queryFinished to true
  if (queryStatus === 100) {
    queryFinished = true; // global declaration to set downlaod button and inspects buttons back to disabled for new queries
    queryResultsDeterminateElement.parentNode.parentNode.classList.add("hide");
    exportQueryResultsElement.classList.remove("disabled");
    toolTipInfoElement.classList.add("hide");
    queryResultsMetadataElement.innerHTML = `<p>The query resulted in a total of ${chunk["match_count"]} matches. </p> <p> ${result["loaded_match_count"]} of ${result["match_count"]} matches in ${count_corpus_files} corpus files have been loaded.<i class="material-icons">check_circle</i></p>`;
    activateInspect();
  }
}


// ### Functions to inspect one match, to show more details ###

// activate inspect buttons if queryFinished is true
function activateInspect() {
  if (queryFinished) {
    let inspectBtnElements = document.getElementsByClassName("inspect");
    for (let inspectBtn of inspectBtnElements) {
      inspectBtn.classList.remove("disabled");
    }
  }
}

//gets result cpos infos for one dataIndex to send back to the server
function inspect(dataIndex) {
  console.log("Inspect!");
  console.log(result["matches"][dataIndex]["hit"]);
  contextModal.open();
  nopaque.socket.emit("inspect_match", {"cpos": result["matches"][dataIndex]["hit"]});
}

function showMatchContext(message) {
  console.log("### match_context ###");
  console.log("Incoming data:", message);
  contextResultsElement.innerHTML = "<p>&nbsp;</p>";
  document.getElementById("context-modal-loading").classList.add("hide");
  document.getElementById("context-modal-ready").classList.remove("hide");

  let sentenceElement, token, tokenElement;

  for (let [key, value] of Object.entries(message['context_s_cpos'])) {
    sentenceElement = document.createElement("p");
    for (cpos of value) {
      token = message["cpos_lookup"][cpos];
      tokenElement = document.createElement("span");
      tokenElement.classList.add("token");
      if (message["match_cpos_list"].includes(cpos)) {
        tokenElement.classList.add("bold");
        tokenElement.classList.add("light-green");
      }
      tokenElement.dataset.cpos = cpos;
      tokenElement.innerText = token["word"];
      var expertModeSwitchElement = document.getElementById("expert-mode-switch");
      if (expertModeSwitchElement.checked) {
        expertModeOn([tokenElement], message);
      }
      sentenceElement.append(tokenElement);
      sentenceElement.append(document.createTextNode(" "));
    }
    contextResultsElement.append(sentenceElement);
  }
}

// ### Display options changing live how the matches are being displayed ###

// Event function that changes the shown hits per page.
// Just alters the resultList.page property
function changeHitsPerPage(event) {
  try {
    resultList.page = event.target.value;
    resultList.update();
    nopaque.toast("Updated matches per page.")
  } catch (e) {
    console.log("resultList has no results right now. Live update of items per page is useless for now.");
  }
}

// Event function triggered on context select change and also if pagination is clicked
function changeContext(event) {
  // newValue = event.target.value;  // cannot use this anymore due to reuse of this function in the above paginationElements eventListener
  console.log("Event", event);
  try {
      if (event.type === "change") {
          nopaque.toast("Updated context per match!");
      }
  } catch (e) {
      console.log(e);
      console.log("This error is expected.");
  } finally {
      var contextPerItemElement = document.getElementById("context");
      newValue = contextPerItemElement.value;
      console.log(newValue);
      var lc = document.getElementsByClassName("left-context");
      var rc = document.getElementsByClassName("right-context");
      for (let element of lc) {
        array = Array.from(element.childNodes);
        for (let element of array.slice(newValue)) {
          element.classList.add("hide");
        }
        for (let element of array.slice(0, newValue)) {
          element.classList.remove("hide");
        }
      }
      for (let element of rc) {
        array = Array.from(element.childNodes);
        for (let element of array.slice(newValue)) {
          element.classList.add("hide");
        }
        for (let element of array.slice(0, newValue)) {
          element.classList.remove("hide");
        }
      }
  }
}

// ### Expert view event functions ###

// Event function to check if pagination is used and then look if
// expertModeSwitchElement is checked
// if checked than expertModeOn is executed
// if unchecked expertModeOff is executed
function eventHandlerCheck(event) {
  console.log("pagination used!");
  console.log(expertModeSwitchElement.checked);
  if (expertModeSwitchElement.checked) {
    expertModeOn(event.currentTarget.tokenElements, result);
  } else if (!expertModeSwitchElement.checked) {
    event.preventDefault();
    console.log("prevented! Destroy");
    expertModeOff(event.currentTarget.tokenElements);
  }
}

// function to apply extra information and animation to every token
function expertModeOn(tokenElements, result_lookup) {
  console.log("expertModeOn!");
  for (tokenElement of tokenElements) {
    tokenElement.classList.add("chip");
    tokenElement.classList.add("hoverable");
    tokenElement.classList.add("expert-view");
    token = result_lookup["cpos_lookup"][tokenElement.dataset.cpos];
    tokenElement.addEventListener("mouseover", function(event) {
      console.log("Mouseover!");
      console.log(event.target);
      token = result_lookup["cpos_lookup"][event.target.dataset.cpos];
      addToolTipToTokenElement(event.target, token);
    })
  }
}

// fuction that creates Tooltip for one token and extracts the corresponding
// infos from the result JSON
function addToolTipToTokenElement(tokenElement, token) {
  M.Tooltip.init(tokenElement,
                 {"html": `<table>
                             <tr>
                               <th>Token information</th>
                               <th>Source information</th>
                             </tr>
                             <tr>
                               <td class="left-align">
                                 Word: ${token["word"]}<br>
                                 Lemma: ${token["lemma"]}<br>
                                 POS: ${token["pos"]}<br>
                                 Simple POS: ${token["simple_pos"]}<br>
                                 NER: ${token["ner"]}
                               </td>
                               <td class="left-align">
                                 Title: ${result["text_lookup"][token["text"]]["title"]}<br>
                                 Author: ${result["text_lookup"][token["text"]]["author"]}<br>
                                 Publishing year: ${result["text_lookup"][token["text"]]["publishing_year"]}
                               </td>
                             </tr>
                           </table>`,
                 "inDuration": 1500,
                 "margin": 15,
                 "position": "top",
                 "transitionMovement": 0});
}

// function to remove extra informations and animations from tokens
function expertModeOff(tokenElements) {
  console.log("expertModeOff!");
  for (tokenElement of tokenElements) {
    tokenElement.classList.remove("chip");
    tokenElement.classList.remove("hoverable");
    tokenElement.classList.remove("expert-view");
    tokenElement.outerHTML = tokenElement.outerHTML; // this is actually a workaround, but it works pretty fast
  }
}


// ### Download results functions ###

// function creates a unique and safe filename for the download
function createDownloadFilename() {
  // get and create metadata
  console.log("Create Metadata!");
  var today = new Date();
  var currentDate = today.getUTCFullYear() + '-' + (today.getUTCMonth() +1) + '-' + today.getUTCDate();
  var currentTime = today.getUTCHours() + ":" + today.getUTCMinutes() + ":" + today.getUTCSeconds();
  var safeFilename = result['query'].replace(/[^a-z0-9_-]/gi, "_");
  var resultFilename = "UTC-" + currentDate + "_" + currentTime + "_" + safeFilename;
  return resultFilename
}

// function to download the results as JSON
function downloadJSONRessource(resultFilename) {
  // stringify JSON object for json download
  var dataStr = JSON.stringify(result, undefined, "\t"); // use tabs to save some space
  // get downloadResultsElement
  downloadElement = document.getElementById("download-results-json");
  // start actual download
  download(downloadElement, dataStr, resultFilename, "text/json", ".json")
}

// Function to download data as a Blob created from a string, should be multi purpose
function download(downloadElem, dataStr, filename, type, filenameSlug) {
  console.log("Start Download!");
  filename += filenameSlug;
  var file = new Blob([dataStr], {type: type});
  if (window.navigator.msSaveOrOpenBlob) // IE10+
      window.navigator.msSaveOrOpenBlob(file, filename);
  else { // Others
      var url = URL.createObjectURL(file);
      downloadElem.href = url;
      downloadElem.download = filename;
    }
}