// This code is licensed under the same terms as Habitica:
  // https://raw.githubusercontent.com/HabitRPG/habitrpg/develop/LICENSE

/* ========================================== */
/* [Users] Required script data to fill in    */
/* ========================================== */
const USER_ID = "PasteYourUserIdHere";
const API_TOKEN = "PasteYourApiTokenHere"; // Do not share this to anyone
const WEB_APP_URL = "PasteGeneratedWebAppUrlHere";

/* ========================================== */
/* [Users] Required customizations to fill in */
/* ========================================== */

// Which version do you want to use?
// If you want to heal a set number when leveling up (such as 4.5 HP), select 2.
// If you want to heal a percent of your remaining health (such as 25%), select 3.
const VERSION = 2;

// How much HP do you want to gain each level-up? Fill in the correct one (set value or percent of remaining health)
const HP_SET_VALUE_PER_LEVEL = 4.5; // Enter a number between 0 and 50.
const HP_PERCENT_PER_LEVEL = 50.0; // Do not put a percent sign after the number here. Enter a number between 0 and 100.

/* ========================================== */
/* [Users] Optional customizations to fill in */
/* ========================================== */

/* ========================================== */
/* [Users] Do not edit code below this line   */
/* ========================================== */
const AUTHOR_ID = "0034eb14-b4d8-494e-8386-d3f33cff7922";
const SCRIPT_NAME = "Partial Healing";
const HEADERS = {
  "x-client" : AUTHOR_ID + " - " + SCRIPT_NAME,
  "x-api-user" : USER_ID,
  "x-api-key" : API_TOKEN,
}

const scriptProperties = PropertiesService.getScriptProperties(); // Constants can have properties changed

const HP_KEY = "HP_KEY";
const LVL_KEY = "LVL_KEY";
const TIMESTAMP_KEY = "TIMESTAMP_KEY";

var hpKey = "";
var lvlKey = "";
var timestampKey = "";

function doOneTimeSetup() { 
  // create the webhook
  const options = {
    "scored" : true,
  }
  const payload = {
    "url" : WEB_APP_URL,
    "label" : SCRIPT_NAME + " Webhook",
    "type" : "taskActivity",
    "options" : options,
  }
  apiMult_createNewWebhookNoDuplicates(payload);
  
  // set script properties so they carry over to next session
  initScriptProperties();
}

// do things when the webhook runs
function doPost(e) {
  const dataContents = JSON.parse(e.postData.contents);
  const type = dataContents.type;
  
  if (type == "scored") {
    var timestampKey = TIMESTAMP_KEY;
    var timeStart = Number(scriptProperties.getProperty(timestampKey));
    if ( (timeStart == 0) || (timeStart == "") || (timeStart == undefined) || (timeStart == null) ) {
      timeStart = Date.now();
    }
    var timeEnd = Date.now();
    
    // Rate limiting: only grab HP and LVL if it's been 5 seconds between clicks
    if ( (timeEnd - timeStart) >= 5000 ) {
    
      var hpKey = HP_KEY;
      var lvlKey = LVL_KEY;
    
      var prevHp = Number(scriptProperties.getProperty(hpKey));
      var prevLvl = Number(scriptProperties.getProperty(lvlKey));
    
      const response = api_getAuthenticatedUserProfile("stats");
      user = JSON.parse(response).data;
    
      var currentHp = user.stats.hp;
      var currentLvl = user.stats.lvl;
    
      // See if they've leveled up
      if (currentLvl > prevLvl) {
        if ( VERSION == 2 ) {
          var valueToHeal = sanitizeInput (HP_SET_VALUE_PER_LEVEL, 0, 50);
          var newHp = valueToHeal + prevHp;
        
          if (newHp >= 50) { api_updateUser({"stats.hp" : 50}); }
          else { api_updateUser({"stats.hp" : newHp}); }
      
          prevHp = newHp;        
          prevLvl = currentLvl;
        }
        else if ( VERSION == 3 ) {
          var percentToHeal = sanitizeInput (HP_PERCENT_PER_LEVEL, 0, 100);
          var healing = ( percentToHeal / 100 ) * ( 50 - prevHp );
          var newHpPercent = healing + prevHp;
        
          if (newHpPercent >= 50) { api_updateUser({"stats.hp" : 50}); }
          else { api_updateUser({"stats.hp" : newHpPercent}); }
      
          prevHp = newHp;        
          prevLvl = currentLvl;
        }
      }
      else {
        // If previous and current HP are the same, no need to re-save
        if (prevHp != currentHp) {
          prevHp = currentHp;
        }
      }
      // Save values to non-volatile memory
      timeStart = timeEnd;
      scriptProperties.setProperty(hpKey, prevHp);
      scriptProperties.setProperty(lvlKey, prevLvl);
      scriptProperties.setProperty(timestampKey, timeStart);
      
      return HtmlService.createHtmlOutput();
    }
  }
}

// Create a webhook if no duplicate exists
function apiMult_createNewWebhookNoDuplicates(payload) {
  const response = api_getWebhooks();
  const webhooks = JSON.parse(response).data;
  var duplicateExists = 0;
    
  for (var i in webhooks) {
    if (webhooks[i].label == payload.label) {
      duplicateExists = 1;
    }
  }
  // If webhook to be created doesn't exist yet
  if (!duplicateExists) {
    api_createNewWebhook(payload);
  }
}

// Used to see existing webhooks, and therefore if there's a duplicate
function api_getWebhooks() {
  const params = {
    "method" : "get",
    "headers" : HEADERS,
    "muteHttpExceptions" : true,
  }
  
  const url = "https://habitica.com/api/v3/user/webhook";
  return UrlFetchApp.fetch(url, params);
}

// Creates a webhook (as part of the "don't make it if there's a duplicate" function)
function api_createNewWebhook(payload) {
  const params = {
    "method" : "post",
    "headers" : HEADERS,
    "contentType" : "application/json",
    "payload" : JSON.stringify(payload),
    "muteHttpExceptions" : true,
  }
   
  const url = "https://habitica.com/api/v3/user/webhook";
  return UrlFetchApp.fetch(url, params);
}

// Gets user info so I can use it, especially stats like mana, experience, and level
function api_getAuthenticatedUserProfile(userFields) {
  const params = {
    "method" : "get",
    "headers" : HEADERS,
    "muteHttpExceptions" : true,
  }
  
  var url = "https://habitica.com/api/v3/user";
  if (userFields != "") {
    url += "?userFields=" + userFields;
  }

  return UrlFetchApp.fetch(url, params);
}

// Sets initial properties that will be used/saved later.
function initScriptProperties() {
  const responseInit = api_getAuthenticatedUserProfile("stats");
  user = JSON.parse(responseInit).data;
    
  var currentHp = user.stats.hp;
  var currentLvl = user.stats.lvl;
  var timestampInit = Date.now();
  
  scriptProperties.setProperty(HP_KEY, currentHp);
  scriptProperties.setProperty(LVL_KEY, currentLvl);
  scriptProperties.setProperty(TIMESTAMP_KEY, timestampInit);
}

function sanitizeInput (input, minimum, maximum) {
  if ( input < minimum ) {
    return minimum;
  }
  else if ( input > maximum ) {
    return maximum;
  }
  else { return input; }
}

function api_updateUser(payload) { 
  const params = {
    "method" : "put",
    "headers" : HEADERS,
    "contentType" : "application/json",
    "payload" : JSON.stringify(payload),
    "muteHttpExceptions" : true,
  }
  
  const url = "https://habitica.com/api/v3/user";
  return UrlFetchApp.fetch(url, params);
}