const path = require('path')
const {
    ipcRenderer
} = require('electron')
const {
    v4: uuidv4
} = require('uuid');
// https://stackoverflow.com/a/26227660
var appDataFolder = process.env.APPDATA || (process.platform == 'darwin' ? process.env.HOME + '/Library/Application Support' : process.env.HOME + "/.config")
var configFolder = path.join(appDataFolder, "FreeDATA");
var configPath = path.join(configFolder, 'config.json')
const config = require(configPath);
// set date format
const dateFormat = new Intl.DateTimeFormat('en-GB', {
    timeStyle: 'long',
    dateStyle: 'full'
});
// set date format information
const dateFormatShort = new Intl.DateTimeFormat('en-GB', {
    year: 'numeric',
    month: 'numeric',
    day: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
    second: 'numeric',
    hour12: false,
});

const dateFormatHours = new Intl.DateTimeFormat('en-GB', {
    hour: 'numeric',
    minute: 'numeric',
    hour12: false,
});
// split character
const split_char = '\0;\1;'
// global for our selected file we want to transmit
// ----------------- some chat globals
var filetype = '';
var file = '';
var filename = '';
var callsign_counter = 0;
var selected_callsign = '';
// -----------------------------------

var chatDB = path.join(configFolder, 'chatDB')
// ---- MessageDB
try{
    var PouchDB = require('pouchdb');
} catch(err){
    console.log(err);

    /*
    This is a fix for raspberryPi where we get an error when loading pouchdb because of
    leveldown package isnt running on ARM devices.
    pouchdb-browser does not depend on leveldb and seems to be working.
    */
    console.log("using pouchdb-browser fallback")
    var PouchDB = require('pouchdb-browser');
}

PouchDB.plugin(require('pouchdb-find'));
//PouchDB.plugin(require('pouchdb-replication'));

var db = new PouchDB(chatDB);

/*
// REMOTE SYNC ATTEMPTS


var remoteDB = new PouchDB('http://172.20.10.4:5984/chatDB')

// we need express packages for running pouchdb sync "express-pouchdb"
var express = require('express');
var app = express();
//app.use('/chatDB', require('express-pouchdb')(PouchDB));
//app.listen(5984);

app.use('/chatDB', require('pouchdb-express-router')(PouchDB));
app.listen(5984);



db.sync('http://172.20.10.4:5984/jojo', {
//var sync = PouchDB.sync('chatDB', 'http://172.20.10.4:5984/chatDB', {
  live: true,
  retry: false
}).on('change', function (change) {
  // yo, something changed!
  console.log(change)
}).on('paused', function (err) {
  // replication was paused, usually because of a lost connection
  console.log(err)
}).on('active', function (info) {
  // replication was resumed
  console.log(info)
}).on('error', function (err) {
  // totally unhandled error (shouldn't happen)
  console.log(err)
}).on('denied', function (err) {
  // a document failed to replicate (e.g. due to permissions)
  console.log(err)
}).on('complete', function (info) {
  // handle complete;
  console.log(info)
});
*/

var dxcallsigns = new Set();
db.createIndex({
    index: {
        fields: ['timestamp', 'uuid', 'dxcallsign', 'dxgrid', 'msg', 'checksum', 'type', 'command', 'status', 'percent', 'bytesperminute', '_attachments']
    }
}).then(function(result) {
    // handle result
    console.log(result)
}).catch(function(err) {
    console.log(err);
});

db.find({
    selector: {
        timestamp: {
            $exists: true
        }
    },
    sort: [{
        'timestamp': 'asc'
    }]
}).then(function(result) {
    // handle result
    if (typeof(result) !== 'undefined') {
        result.docs.forEach(function(item) {
            //console.log(item)
            // another query with attachments
            db.get(item._id, {
                attachments: true
            }).then(function(item_with_attachments){
                update_chat(item_with_attachments);
            });



        });
    }
}).catch(function(err) {
    console.log(err);
});
// WINDOW LISTENER
window.addEventListener('DOMContentLoaded', () => {


    // theme selector
    if(config.theme != 'default'){
        var theme_path = "../node_modules/bootswatch/dist/"+ config.theme +"/bootstrap.min.css";
        document.getElementById("bootstrap_theme").href = theme_path;
    } else {    
        var theme_path = "../node_modules/bootstrap/dist/css/bootstrap.min.css";
        document.getElementById("bootstrap_theme").href = theme_path;
    }


    document.querySelector('emoji-picker').addEventListener("emoji-click", (event) => {
        var msg = document.getElementById('chatModuleMessage');
        //Convert to utf-8--so we can just use utf-8 everywhere
        msg.setRangeText(event.detail.emoji.unicode.toString('utf-8'));
        //console.log(event.detail);
        //msg.focus();
    })
    document.getElementById("emojipickerbutton").addEventListener("click", () => {
        var element = document.getElementById("emojipickercontainer")
        console.log(element.style.display);
        if (element.style.display === "none") {
            element.style.display = "block";
        } else {
            element.style.display = "none";
        }
    })
    document.getElementById("delete_selected_chat").addEventListener("click", () => {
        db.find({
            selector: {
                dxcallsign: selected_callsign
            }
        }).then(function(result) {
            // handle result
            if (typeof(result) !== 'undefined') {
                result.docs.forEach(function(item) {
                    console.log(item)
                    db.get(item._id).then(function(doc) {
                        db.remove(doc).then(function(doc) {
                            return location.reload();
                        }).catch(function(err) {
                            console.log(err);
                        });
                    }).catch(function(err) {
                        console.log(err);
                    });

                });
            }
        }).catch(function(err) {
            console.log(err);
        });
    })
    document.getElementById("selectFilesButton").addEventListener("click", () => {
        //document.getElementById('selectFiles').click();
        ipcRenderer.send('select-file', {
            title: 'Title',
        }); 
    })    
    
    document.getElementById("ping").addEventListener("click", () => {
        ipcRenderer.send('run-tnc-command', {
            command: 'ping', dxcallsign: selected_callsign
        }); 
    })
    
    
    document.addEventListener("keyup", function(event) {
    // Number 13 == Enter
        if (event.keyCode === 13 && !event.shiftKey) {
            // Cancel the default action, if needed
            event.preventDefault();
            // Trigger the button element with a click
            document.getElementById("sendMessage").click();
        }
    }); 

    // ADJUST TEXTAREA SIZE
    document.getElementById("chatModuleMessage").addEventListener("input", () => {
        var textarea = document.getElementById("chatModuleMessage");
        var text = textarea.value;

        if(document.getElementById("expand_textarea").checked){
        var lines = 6
        } else {
        var lines = text.split("\n").length

        if (lines >= 6){
         lines = 6;
        }

        }
        var message_container_height_offset = 130 + (20*lines);
        var message_container_height = `calc(100% - ${message_container_height_offset}px)`;
        document.getElementById("message-container").style.height = message_container_height;
        textarea.rows = lines;

        console.log(textarea.value)


    })

 document.getElementById("expand_textarea").addEventListener("click", () => {
  var textarea = document.getElementById("chatModuleMessage");

if(document.getElementById("expand_textarea").checked){
    var lines=6
    document.getElementById("expand_textarea_button").className = "bi bi-chevron-compact-down";

} else {
    var lines=1
    document.getElementById("expand_textarea_button").className = "bi bi-chevron-compact-up";
}

 var message_container_height_offset = 130 + (20*lines);
 //var message_container_height_offset = 90 + (23*lines);
        var message_container_height = `calc(100% - ${message_container_height_offset}px)`;
 document.getElementById("message-container").style.height = message_container_height;
 textarea.rows = lines;
 console.log(textarea.rows)

   })


    // NEW CHAT

    document.getElementById("createNewChatButton").addEventListener("click", () => {
        var dxcallsign = document.getElementById('chatModuleNewDxCall').value;
        var uuid = uuidv4()
db.post({
            
            _id: uuid,
            timestamp: Math.floor(Date.now() / 1000),
            dxcallsign: dxcallsign.toUpperCase(),
            dxgrid: '---',
            msg: 'null',
            checksum: 'null',
            type: 'newchat',
            status: 'null',
            uuid: uuid
            
        }).then(function(response) {
            // handle response
            console.log("new database entry");
            console.log(response);
        }).catch(function(err) {
            console.log(err);
        });
        update_chat_obj_by_uuid(uuid);

    });
    
    // SEND MSG
    document.getElementById("sendMessage").addEventListener("click", () => {
        document.getElementById('emojipickercontainer').style.display = "none";
        
        var dxcallsign = selected_callsign.toUpperCase();
        var textarea = document.getElementById('chatModuleMessage')
        var chatmessage = textarea.value;
        //Remove non-printable chars from begining and end of string--should save us a byte here and there
        chatmessage = chatmessage.toString().trim();
        // reset textarea size
        var message_container_height_offset = 150;
        var message_container_height = `calc(100% - ${message_container_height_offset}px)`;
        document.getElementById("message-container").style.height = message_container_height;
        textarea.rows = 1
        document.getElementById("expand_textarea_button").className = "bi bi-chevron-compact-up";
        document.getElementById("expand_textarea").checked = false;

        console.log(file);
        console.log(filename);
        console.log(filetype);
        if (filetype == ''){
            filetype = 'plain/text'
        }
        var timestamp = Math.floor(Date.now() / 1000);

        var file_checksum = crc32(file).toString(16).toUpperCase();
        console.log(file_checksum)
        var data_with_attachment = timestamp + split_char + chatmessage + split_char + filename + split_char + filetype + split_char + file;

        document.getElementById('selectFilesButton').innerHTML = ``;
        var uuid = uuidv4();
        console.log(data_with_attachment)
        let Data = {
            command: "send_message",
            dxcallsign: dxcallsign,
            mode: 255,
            frames: 1,
            data: data_with_attachment,
            checksum: file_checksum,
            uuid: uuid
        };
        ipcRenderer.send('run-tnc-command', Data);
        db.post({
            _id: uuid,
            timestamp: timestamp,
            dxcallsign: dxcallsign,
            dxgrid: 'null',
            msg: chatmessage,
            checksum: file_checksum,
            type: "transmit",
            status: 'transmit',
            uuid: uuid,
            _attachments: {
                [filename]: {
                    content_type: filetype,
                    //data: btoa(file)
                    data: btoa_FD(file)
                }
            }
        }).then(function(response) {
            // handle response
            console.log("new database entry");
            console.log(response);
        }).catch(function(err) {
            console.log(err);
        });
        update_chat_obj_by_uuid(uuid);

        // clear input
        document.getElementById('chatModuleMessage').value = ''
                
        // after adding file data to our attachment variable, delete it from global
        filetype = '';
        file = '';
        filename = '';
        
        
    })
    // cleanup after transmission
    filetype = '';
    file = '';
    filename = '';
});
ipcRenderer.on('return-selected-files', (event, arg) => {
    filetype = arg.mime;
    console.log(filetype)

    file = arg.data;
    filename = arg.filename;
    document.getElementById('selectFilesButton').innerHTML = `
     <span class="position-absolute top-0 start-85 translate-middle p-2 bg-danger border border-light rounded-circle">
        <span class="visually-hidden">New file selected</span>
     </span>   
    `;
});
ipcRenderer.on('action-update-transmission-status', (event, arg) => {
    var data = arg["data"][0]
    console.log(data.status);
    db.get(data.uuid, {
        attachments: true
    }).then(function(doc) {
        return db.put({
            _id: data.uuid,
            _rev: doc._rev,
            timestamp: doc.timestamp,
            dxcallsign: doc.dxcallsign,
            dxgrid: doc.dxgrid,
            msg: doc.msg,
            checksum: doc.checksum,
            type: "transmit",
            status: data.status,
            percent: data.percent,
            bytesperminute: data.bytesperminute,
            uuid: doc.uuid,
            _attachments: doc._attachments
        });
    }).then(function(response) {
            update_chat_obj_by_uuid(data.uuid);

    }).catch(function(err) {
        console.log(err);
        console.log(data)
    });
});
ipcRenderer.on('action-new-msg-received', (event, arg) => {
    console.log(arg.data)

    var new_msg = arg.data;
    new_msg.forEach(function(item) {
        console.log(item.status)
        let obj = new Object();

        //handle ping
        if (item.ping == 'received') {
            obj.timestamp = parseInt(item.timestamp);
            obj.dxcallsign = item.dxcallsign;
            obj.dxgrid = item.dxgrid;
            obj.uuid = item.uuid;
            obj.command = 'ping';
            obj.checksum = 'null';
            obj.msg = 'null';
            obj.status = item.status;
            obj.snr = item.snr;
            obj.type = 'ping';
            obj.filename = 'null';
            obj.filetype = 'null';
            obj.file = 'null';

            add_obj_to_database(obj)
            update_chat_obj_by_uuid(obj.uuid);

        // handle beacon
        } else if (item.beacon == 'received') {
            obj.timestamp = parseInt(item.timestamp);
            obj.dxcallsign = item.dxcallsign;
            obj.dxgrid = item.dxgrid;
            obj.uuid = item.uuid;
            obj.command = 'beacon';
            obj.checksum = 'null';
            obj.msg = 'null';
            obj.status = item.status;
            obj.snr = item.snr;
            obj.type = 'beacon';
            obj.filename = 'null';
            obj.filetype = 'null';
            obj.file = 'null';

            add_obj_to_database(obj);
            update_chat_obj_by_uuid(obj.uuid);


        // handle ARQ transmission
        } else if (item.arq == 'transmission' && item.status == 'received') {
            //var encoded_data = atob(item.data);
            //var encoded_data = Buffer.from(item.data,'base64').toString('utf-8');
            var encoded_data = atob_FD(item.data);
            var splitted_data = encoded_data.split(split_char);

            console.log(splitted_data)

            obj.timestamp = parseInt(splitted_data[4]);
            obj.dxcallsign = item.dxcallsign;
            obj.dxgrid = item.dxgrid;
            obj.command = splitted_data[1];
            obj.checksum = splitted_data[2];
            // convert message to unicode from utf8 because of emojis
            //No, don't convert; we're already UTF-8!!!!!
            obj.uuid = splitted_data[3];
            obj.msg = splitted_data[5];
            obj.status = 'null';
            obj.snr = 'null';
            obj.type = 'received';
            obj.filename = splitted_data[6];
            obj.filetype = splitted_data[7];
            //obj.file = btoa(splitted_data[8]);
            obj.file = btoa_FD(splitted_data[8]);

            add_obj_to_database(obj);
            update_chat_obj_by_uuid(obj.uuid);

        }
    });
    //window.location = window.location;
});




// Update chat list
update_chat = function(obj) {
    var dxcallsign = obj.dxcallsign;
    var timestamp = dateFormat.format(obj.timestamp * 1000);
    var timestampShort = dateFormatShort.format(obj.timestamp * 1000);
    var timestampHours = dateFormatHours.format(obj.timestamp * 1000);

    var dxgrid = obj.dxgrid;
    
    // define shortmessage
    if (obj.msg == 'null' || obj.msg == 'NULL'){
        var shortmsg = obj.type;
    } else {
        var shortmsg = obj.msg;
        var maxlength = 30;
        var shortmsg = shortmsg.length > maxlength ? shortmsg.substring(0, maxlength - 3) + "..." : shortmsg;
  
    }
    try {
        //console.log(Object.keys(obj._attachments)[0].length)
        if (typeof(obj._attachments) !== 'undefined' && Object.keys(obj._attachments)[0].length > 0) {
            //var filename = obj._attachments;
            var filename = Object.keys(obj._attachments)[0]
            var filetype = filename.split('.')[1]
            var filesize = obj._attachments[filename]["length"] + " Bytes";
            if (filesize == 'undefined Bytes'){
                // get filesize of new submitted data
                // not that nice....
                // we really should avoid converting back from base64 for performance reasons...
                //var filesize = Math.ceil(atob(obj._attachments[filename]["data"]).length) + "Bytes";
                var filesize = Math.ceil(atob_FD(obj._attachments[filename]["data"]).length) + " Bytes";
            }

            // check if image, then display it
            if(filetype == 'image/png' || filetype =="png"){
                        var fileheader = `
        <div class="card-header border-0 bg-transparent text-end p-0 mb-0 hover-overlay">
        <img class="w-100 rounded-2" src="data:image/png;base64,${obj._attachments[filename]["data"]}">
       <p class="text-right mb-0 p-1 text-black" style="text-align: right; font-size : 1rem">
                    <span class="p-1" style="text-align: right; font-size : 0.8rem">${filename}</span>
                    <span class="p-1" style="text-align: right; font-size : 0.8rem">${filesize}</span>
                            <i class="bi bi-filetype-${filetype}" style="font-size: 2rem;"></i>
                        </p>
        </div>
        <hr class="m-0 p-0">
        `;

            }else{

            var fileheader = `
        <div class="card-header border-0 bg-transparent text-end p-0 mb-0 hover-overlay">
       <p class="text-right mb-0 p-1 text-black" style="text-align: right; font-size : 1rem">
                    <span class="p-1" style="text-align: right; font-size : 0.8rem">${filename}</span>
                    <span class="p-1" style="text-align: right; font-size : 0.8rem">${filesize}</span>
                            <i class="bi bi-filetype-${filetype}" style="font-size: 2rem;"></i>
                        </p>
        </div>
        <hr class="m-0 p-0">
        `;
        }


        
        var controlarea_transmit = `
        <div class="ms-auto" id="msg-${obj._id}-control-area">
                <button class="btn bg-transparent p-1 m-1"><i class="bi bi-arrow-repeat" id="retransmit-msg-${obj._id}" style="font-size: 1.2rem; color: grey;"></i></button>
                <button class="btn bg-transparent p-1 m-1"><i class="bi bi-download" id="save-file-msg-${obj._id}" style="font-size: 1.2rem; color: grey;"></i></button>
             </div>

        `;

        var controlarea_receive = `
        
             <div class="me-auto" id="msg-${obj._id}-control-area">
                <button class="btn bg-transparent p-1 m-1"><i class="bi bi-download" id="save-file-msg-${obj._id}" style="font-size: 1.2rem; color: grey;"></i></button>
             </div>

        `;        
        
        } else {
            var filename = '';
            var fileheader = '';
            var filetype = 'text/plain';
            var controlarea_transmit = `
<div class="ms-auto" id="msg-${obj._id}-control-area">
                <button class="btn bg-transparent p-1 m-1"><i class="bi bi-arrow-repeat" id="retransmit-msg-${obj._id}" style="font-size: 1.2rem; color: grey;"></i></button>
             </div>
        `;
                    var controlarea_receive = '';
        }
    } catch (err) {
        console.log("error with database parsing...")
        console.log(err)
    }
    // CALLSIGN LIST
    if (!(document.getElementById('chat-' + dxcallsign + '-list'))) {
        // increment callsign counter
        callsign_counter++;
        if (callsign_counter == 1) {
            var callsign_selected = 'active show'
            //document.getElementById('chatModuleDxCall').value = dxcallsign;
            selected_callsign = dxcallsign;
        }
 
        var new_callsign = `
            <a class="list-group-item list-group-item-action rounded-4 rounded-top rounded-bottom border-1 mb-2 ${callsign_selected}" id="chat-${dxcallsign}-list" data-bs-toggle="list" href="#chat-${dxcallsign}" role="tab" aria-controls="chat-${dxcallsign}">
                      
                      <div class="d-flex w-100 justify-content-between">
                          <div class="rounded-circle p-0">
                            <i class="bi bi-person-circle p-1" style="font-size:2rem;"></i>
                          </div>

                        <h5 class="mb-1">${dxcallsign}</h5>
                        <span class="badge bg-secondary text-white p-1 h-100" id="chat-${dxcallsign}-list-dxgrid"><small>${dxgrid}</small></span>                        
                        <span style="font-size:0.8rem;" id="chat-${dxcallsign}-list-time">${timestampHours}</span>
                        <span class="position-absolute m-2 bottom-0 end-0" style="font-size:0.8rem;" id="chat-${dxcallsign}-list-shortmsg">${shortmsg}</span>
                      </div>

                  </a>

            `;
        document.getElementById('list-tab').insertAdjacentHTML("beforeend", new_callsign);
        var message_area = `
            <div class="tab-pane fade ${callsign_selected}" id="chat-${dxcallsign}" role="tabpanel" aria-labelledby="chat-${dxcallsign}-list"></div>  
            `;
        document.getElementById('nav-tabContent').insertAdjacentHTML("beforeend", message_area);
        // create eventlistener for listening on clicking on a callsign
        document.getElementById('chat-' + dxcallsign + '-list').addEventListener('click', function() {
            //document.getElementById('chatModuleDxCall').value = dxcallsign;
            selected_callsign = dxcallsign;


            setTimeout(scrollMessagesToBottom, 200);




        });
    
    // if callsign entry already exists - update
    } else {
    
        // gridsquare - update only on receive
        if (obj.type !== 'transmit'){
            document.getElementById('chat-' + dxcallsign +'-list-dxgrid').innerHTML = dxgrid;
        }
        // time
        document.getElementById('chat-' + dxcallsign +'-list-time').innerHTML = timestampHours;
        // short message
        document.getElementById('chat-' + dxcallsign +'-list-shortmsg').innerHTML = shortmsg;

        
    }
    // APPEND MESSAGES TO CALLSIGN
    
    if (!(document.getElementById('msg-' + obj._id))) {
        if (obj.type == 'ping') {
            var new_message = `
                <div class="m-auto mt-1 p-0 w-50 rounded bg-secondary bg-gradient" id="msg-${obj._id}">         
                    <p class="text-small text-white mb-0 text-break" style="font-size: 0.7rem;"><i class="m-3 bi bi-arrow-left-right"></i>snr: ${obj.snr} - ${timestamp}     </p>
                    
                </div>
            `;
        }
        if (obj.type == 'beacon') {
            var new_message = `
                <div class="p-0 rounded m-auto mt-1 w-50 bg-info bg-gradient" id="msg-${obj._id}">         
                    <p class="text-small text-white text-break" style="font-size: 0.7rem;"><i class="m-3 bi bi-broadcast"></i>snr: ${obj.snr} - ${timestamp}     </p>
                </div>
            `;
        }
        
        if (obj.type == 'newchat') {
            var new_message = `
                <div class="p-0 rounded m-auto mt-1 w-50 bg-light bg-gradient" id="msg-${obj._id}">         
                    <p class="text-small text-dark text-break" style="font-size: 0.7rem;"><i class="m-3 bi bi-file-earmark-plus"></i> new chat opened - ${timestamp}     </p>
                </div>
            `;
        }
        
        
        // CHECK FOR NEW LINE AND REPLACE WITH <br>
        var message_html = obj.msg.replaceAll(/\n/g, "<br>");
        
        
        if (obj.type == 'received') {
            var new_message = `
             <div class="d-flex align-items-center" style="margin-left: auto;"> <!-- max-width: 75%;  -->
    
                    <div class="mt-3 rounded-3 mb-0" style="max-width: 75%;" id="msg-${obj._id}">            
                    <!--<p class="font-monospace text-small mb-0 text-muted text-break">${timestamp}</p>-->
                    <div class="card border-light bg-light" id="msg-${obj._id}">
                      ${fileheader}
                                            
                      <div class="card-body rounded-3 p-0">
                        <p class="card-text p-2 mb-0 text-break text-wrap">${message_html}</p>
                        <p class="text-right mb-0 p-1 text-white" style="text-align: left; font-size : 0.9rem">
                            <span class="badge bg-light text-muted">${timestamp}</span>  
                            
                        </p>
                      </div>
                    </div>
                </div>
                
                
                
                  ${controlarea_receive}
                
                
                </div>
                `;
        }

        if (obj.type == 'transmit') {
        
            //console.log('msg-' + obj._id + '-status')

            if (obj.status == 'failed'){
                var progressbar_bg = 'bg-danger';
            } else {
                var progressbar_bg = 'bg-primary';
            }
           
            //Sneak in low graphics mode if so enabled for progress bars
            if (config.high_graphics.toString().toUpperCase() !="TRUE")
            {
                progressbar_bg += " disable-effects";
                //console.log("Low graphics enabled for chat module");
            }
            var new_message = `

            <div class="d-flex align-items-center"> <!-- max-width: 75%;  w-75 -->
            
            ${controlarea_transmit}
               
            <div class="rounded-3 mt-2 mb-0" style="max-width: 75%;" > <!-- w-100 style="margin-left: auto;"-->

                    <!--<p class="font-monospace text-right mb-0 text-muted" style="text-align: right;">${timestamp}</p>-->
                    <div class="card border-primary  bg-primary" id="msg-${obj._id}">
                    ${fileheader}
                    
                      <div class="card-body rounded-3 p-0 text-right bg-primary">
                        <p class="card-text p-1 mb-0 text-white text-break text-wrap">${message_html}</p>
                        <p class="text-right mb-0 p-1 text-white" style="text-align: right; font-size : 0.9rem">
                            <span class="text-light" style="font-size: 0.7rem;">${timestamp} - </span>
                            
                            <span class="text-white" id="msg-${obj._id}-status" style="font-size:0.8rem;">${get_icon_for_state(obj.status)}</span>

                            <!--<button type="button" id="retransmit-msg-${obj._id}" class="btn btn-sm btn-light p-0" style="height:20px;width:30px"><i class="bi bi-arrow-repeat" style="font-size: 0.9rem; color: black;"></i></button>-->
                            
                        </p>
                        
                       <div class="progress p-0 m-0 rounded-0 rounded-bottom bg-secondary" style="height: 10px;">
                            <div class="progress-bar progress-bar-striped ${progressbar_bg} p-0 m-0 rounded-0 force-gpu" id="msg-${obj._id}-progress" role="progressbar" style="width: ${obj.percent}%;" aria-valuenow="${obj.percent}" aria-valuemin="0" aria-valuemax="100">
							 </div>
							 

							<p class="justify-content-center d-flex position-absolute m-0 p-0 w-100 text-white" style="font-size: xx-small" id="msg-${obj._id}-progress-information">
							    ${obj.percent} % - ${obj.bytesperminute} Bpm
							    
							</p>

                            
                            
                           
                            </div>
                      </div>
                    </div>
                    
                </div>
                
                </div>

                `;
        }
        // CHECK CHECK CHECK --> This could be done better
        var id = "chat-" + obj.dxcallsign
        document.getElementById(id).insertAdjacentHTML("beforeend", new_message);

    /* UPDATE EXISTING ELEMENTS */
    } else if (document.getElementById('msg-' + obj._id)) {
        console.log("element already exists......")
        console.log(obj)

        console.log(document.getElementById('msg-' + obj._id + '-progress').getAttribute("aria-valuenow"))
        
        document.getElementById('msg-' + obj._id + '-status').innerHTML = get_icon_for_state(obj.status);
        
        document.getElementById('msg-' + obj._id + '-progress').setAttribute("aria-valuenow", obj.percent);
        document.getElementById('msg-' + obj._id + '-progress').setAttribute("style", "width:" + obj.percent + "%;");
        document.getElementById('msg-' + obj._id + '-progress-information').innerHTML = obj.percent + "% - " + obj.bytesperminute + " Bpm";

        if (obj.percent >= 100){
            //document.getElementById('msg-' + obj._id + '-progress').classList.remove("progress-bar-striped");
            document.getElementById('msg-' + obj._id + '-progress').classList.remove("progress-bar-animated");
            document.getElementById('msg-' + obj._id + '-progress').classList.remove("bg-danger");
            document.getElementById('msg-' + obj._id + '-progress').classList.add("bg-primary");

            document.getElementById('msg-' + obj._id + '-progress').innerHTML = '';
        } else {       
            document.getElementById('msg-' + obj._id + '-progress').classList.add("progress-bar-striped");
            document.getElementById('msg-' + obj._id + '-progress').classList.add("progress-bar-animated");
        }

        if (obj.status == 'failed'){
            //document.getElementById('msg-' + obj._id + '-progress').classList.remove("progress-bar-striped");
            document.getElementById('msg-' + obj._id + '-progress').classList.remove("progress-bar-animated");
            document.getElementById('msg-' + obj._id + '-progress').classList.remove("bg-primary");
            document.getElementById('msg-' + obj._id + '-progress').classList.add("bg-danger");
        }
        
        
        
        //document.getElementById(id).className = message_class;
    }
    
    
    
    
    // CREATE SAVE TO FOLDER EVENT LISTENER
    if (document.getElementById('save-file-msg-' + obj._id) && !document.getElementById('save-file-msg-' + obj._id).hasAttribute('listenerOnClick')) {
    
        // set Attribute to determine if we already created an EventListener for this element
        document.getElementById('save-file-msg-' + obj._id).setAttribute('listenerOnClick', 'true');
        
        document.getElementById('save-file-msg-' + obj._id).addEventListener("click", () => {
            saveFileToFolder(obj._id)
        });
        
        
    }
    // CREATE RESEND MSG EVENT LISTENER
    
    // check if element exists and if we already created NOT created an event listener
    if (document.getElementById('retransmit-msg-' + obj._id) && !document.getElementById('retransmit-msg-' + obj._id).hasAttribute('listenerOnClick')) {

        // set Attribute to determine if we already created an EventListener for this element
        document.getElementById('retransmit-msg-' + obj._id).setAttribute('listenerOnClick', 'true');
        document.getElementById('retransmit-msg-' + obj._id).addEventListener("click", () => {

            db.get(obj._id, {
                attachments: true
            }).then(function(doc) {
                // handle doc
                console.log(doc)

                var filename = Object.keys(obj._attachments)[0]
                var filetype = filename.content_type

                console.log(filename)
                console.log(filetype)
                var file = obj._attachments[filename].data
                console.log(file)
                console.log(Object.keys(obj._attachments)[0].data)
                
                //var file = atob(obj._attachments[filename]["data"])
                db.getAttachment(obj._id, filename).then(function(data) {
                    console.log(data)
                    //Rewrote this part to use buffers to ensure encoding is corect -- n1qm
                    var binaryString = atob_FD(data);
                    
                    console.log(binaryString);
                    var data_with_attachment = doc.timestamp + split_char + doc.msg + split_char + filename + split_char + filetype + split_char + binaryString;
                    let Data = {
                        command: "send_message",
                        dxcallsign: doc.dxcallsign,
                        mode: 255,
                        frames: 1,
                        data: data_with_attachment,
                        checksum: doc.checksum,
                        uuid: doc.uuid
                    };
                    console.log(Data)
                    ipcRenderer.send('run-tnc-command', Data);
                });
                /*
                    // convert blob data to binary string
                    blobUtil.blobToBinaryString(data).then(function (binaryString) {
                        console.log(binaryString)
                    }).catch(function (err) {
                      // error
                      console.log(err);
                      binaryString = blobUtil.arrayBufferToBinaryString(data);
                      
                    }).then(function(){

                        console.log(binaryString)
                        console.log(binaryString.length)

                        var data_with_attachment = doc.timestamp + split_char + utf8.encode(doc.msg) + split_char + filename + split_char + filetype + split_char + binaryString;
                            let Data = {
                                command: "send_message",
                                dxcallsign: doc.dxcallsign,
                                mode: 255,
                                frames: 1,
                                data: data_with_attachment,
                                checksum: doc.checksum,
                                uuid: doc.uuid
                            };
                            console.log(Data)
                            ipcRenderer.send('run-tnc-command', Data);

                    });
                });
                */
            }).catch(function(err) {
                console.log(err);
            });
        });

    }
    //window.location = window.location

    // scroll to bottom on new message
    scrollMessagesToBottom();

}



function saveFileToFolder(id) {
    db.get(id, {
        attachments: true
    }).then(function(obj) {
        console.log(obj)
        console.log(Object.keys(obj._attachments)[0].content_type)
        var filename = Object.keys(obj._attachments)[0]
        var filetype = filename.content_type
        var file = filename.data
        console.log(file)
        console.log(filename.data)
        db.getAttachment(id, filename).then(function(data) {
            // handle result
            console.log(data.length)
            //data = new Blob([data.buffer], { type: 'image/png' } /* (1) */) 
            console.log(data)
            // we need to encode data because of error "an object could not be cloned"
            let Data = {
                file: data,
                filename: filename,
                filetype: filetype,
            }
            console.log(Data)
            ipcRenderer.send('save-file-to-folder', Data);
        }).catch(function(err) {
            console.log(err);
            return false
        });
    }).catch(function(err) {
        console.log(err);
    });
}


// function for setting an ICON to the corresponding state
function get_icon_for_state(state) {
    if (state == 'transmit') {
        var status_icon = '<i class="bi bi-check" style="font-size:1rem;"></i>';
    } else if (state == 'transmitting') {
        //var status_icon = '<i class="bi bi-arrow-left-right" style="font-size:0.8rem;"></i>';
        var status_icon = `
            <i class="spinner-border ms-auto" style="width: 0.8rem; height: 0.8rem;" role="status" aria-hidden="true"></i>
        `;
    } else if (state == 'failed') {
        var status_icon = '<i class="bi bi-exclamation-circle" style="font-size:1rem;"></i>';
    } else if (state == 'transmitted') {
        var status_icon = '<i class="bi bi-check-all" style="font-size:1rem;"></i>';
    } else {
        var status_icon = '<i class="bi bi-question" style="font-size:1rem;"></i>';
    }
    return status_icon;
}



update_chat_obj_by_uuid = function(uuid) {
    db.get(uuid, {
        attachments: true
    }).then(function(doc) {
        update_chat(doc)
        //return doc
    }).catch(function(err) {
        console.log(err);
    });
}


add_obj_to_database = function(obj){
    db.put({
        _id: obj.uuid,
        timestamp: parseInt(obj.timestamp),
        uuid: obj.uuid,
        dxcallsign: obj.dxcallsign,
        dxgrid: obj.dxgrid,
        msg: obj.msg,
        checksum: obj.checksum,
        type: obj.type,
        command: obj.command,
        status: obj.status,
        snr: obj.snr,
        _attachments: {
            [obj.filename]: {
                content_type: obj.filetype,
                data: obj.file
            }
        }
    }).then(function(response) {
        console.log("new database entry");
        console.log(response);
    }).catch(function(err) {
        console.log(err);
    });
}


// Scroll to bottom of message-container
function scrollMessagesToBottom() {
    var messageBody = document.getElementById('message-container');
    messageBody.scrollTop = messageBody.scrollHeight - messageBody.clientHeight;
}



// CRC CHECKSUMS
// https://stackoverflow.com/a/50579690
// crc32 calculation
//console.log(crc32('abc'));
//var crc32=function(r){for(var a,o=[],c=0;c<256;c++){a=c;for(var f=0;f<8;f++)a=1&a?3988292384^a>>>1:a>>>1;o[c]=a}for(var n=-1,t=0;t<r.length;t++)n=n>>>8^o[255&(n^r.charCodeAt(t))];return(-1^n)>>>0};
//console.log(crc32('abc').toString(16).toUpperCase()); // hex

var makeCRCTable = function(){
    var c;
    var crcTable = [];
    for(var n =0; n < 256; n++){
        c = n;
        for(var k =0; k < 8; k++){
            c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
        }
        crcTable[n] = c;
    }
    return crcTable;
}

var crc32 = function(str) {
    var crcTable = window.crcTable || (window.crcTable = makeCRCTable());
    var crc = 0 ^ (-1);

    for (var i = 0; i < str.length; i++ ) {
        crc = (crc >>> 8) ^ crcTable[(crc ^ str.charCodeAt(i)) & 0xFF];
    }

    return (crc ^ (-1)) >>> 0;
};
/**
 * Binary to ASCII replacement
 * @param {string} data in normal/usual utf-8 format
 * @returns base64 encoded string
 */
function btoa_FD(data)
{
    return Buffer.from(data,'utf-8').toString('base64');
}
/**
 * ASCII to Binary replacement
 * @param {string} data in base64 encoding
 * @returns utf-8 normal/usual string
 */
function atob_FD(data)
{
    return Buffer.from(data,'base64').toString('utf-8');
}