// GLOBAL ICON array
ICON={}
ICON["Import"]="import"
ICON["Storage"]="db"
ICON["Bin"]="trash"

// function called when we get another page from inside the files view
function getPageFigures(res, viewingIdx)
{
    // add all the figures to files_div
    drawPageOfFigures()
}

// grab all selected thumbnails and return a <div> containing the thumbnails
// with extra yr and date attached as attributes so we can set the default
// dir name for a move directory - not used in del, but no harm to include them
function GetSelnAsDiv()
{
    seln=''
    $('.highlight').each(function( index ) { 
        seln+='<div fname="' + $(this).attr('fname') + '" yr="' + $(this).attr('yr') +
            '" date="' + $(this).attr('date') +
            '" class="px-1 col col-auto">' + $(this).children().parent().html() + '</div>'
        seln+='<input type="hidden" name="eid-'+index+'" value="'+$(this).attr('id')+'">'
        } )
    return '<div class="row col-12">'+seln+'</div>'
}

// return a list of eid=<id> for each selected thumbnail
function GetSelnAsData()
{
    to_del=''
    $('.highlight').each(function( index ) { to_del+='&eid-'+index+'='+$(this).attr('id') } )
    return to_del
}

// use an ajax POST to force an AI scan on the selected image(s)
function RunAIOnSeln(person)
{
    post_data = GetSelnAsData()
    post_data += '&person='+person.replace('ai-','')
    $.ajax({ type: 'POST', data: post_data, url: '/run_ai_on', success: function(data){ CheckForJobs() } })
}

// code to change the associated image/icon when the move to selection box (import or storage paths) is changed
function change_rp_sel()
{
    icon_url = $('option:selected', '#rp_sel').attr('icon_url')
    $('#move_path_icon').html( '<svg id="move_path_icon" width="20" height="20" fill="currentColor"><use xlink:href="'
        + icon_url + '"></svg>' )
    seld_ptype=$('option:selected', '#rp_sel').attr('path_type')
    $('#move_path_type').val( seld_ptype )
    // clear all 'existing' buttons
    $('.move_Import').addClass('d-none')
    $('.move_Storage').addClass('d-none')
    // show just selected path's (relevant) buttons
    $('.move_'+seld_ptype).removeClass('d-none')
}

// POST to see if there are any other existing directories named around this date
// (if so display them as options for a move)
function GetExistingDirsAsDiv( dt, divname, ptype )
{
    $.ajax({
        type: 'POST', data: null, url: '/get_existing_paths/'+dt,
        success: function(data) {
            $('#'+divname).html(data)
            dirs = JSON.parse(data)
            s=''
            dirs.forEach( function(item, index) {
                if( item.ptype != ptype )
                    vis = 'd-none '
                else
                    vis = ''
                s+= '<button class="btn btn-outline-primary move_'+item.ptype+ ' ' + vis + '" '
                    s+= 'onClick="$(\'#prefix\').val(\''+item.prefix.replace("\'","\\\'")+'\'); '
                        s+='$(\'#suffix\').val(\''+item.suffix.replace("\'","\\\'")+'\');return false;">'
                    s+=item.prefix+item.suffix
                    s+='</button>'
            } )
            if( s == '' )
                $('#existing').html('')
            else
                $('#move_'+ptype).removeClass('invisible')
            $('#'+divname).html(s)
        }
    } )
}

// show the DBox for a move file, includes all thumbnails of selected files to move
// and a pre-populated folder to move them into, with text field to add a suffix
function MoveDBox(path_details)
{
    $('#dbox-title').html('Move Selected File(s) to new directory in Storage Path')  
    div =`
        <div class="form-row col-12">
        <p class="col">Moving the following files?</p>
        </div>
        <form id="mv_fm" class="form form-control-inline col-12">
        <input id="move_path_type" name="move_path_type" type="hidden"
        `
    div += ' value="' + path_details[0].type.name + '"></input>'
    div+=GetSelnAsDiv()
    yr=$('.highlight').first().attr('yr')
    dt=$('.highlight').first().attr('date')
    div+='<div class="row">Use Existing Directory (in the chosen path):</div><div id="existing"></div>'
    GetExistingDirsAsDiv( dt, "existing", 'Storage' )
    div+=`
        <div class="input-group my-3">
        <alert class="alert alert-primary my-auto py-1">
        `
    // NB: alert-primary here is a hack to get the bg the same color as the alert primary by
    div+= '<svg id="move_path_icon" width="20" height="20" fill="currentColor"><use xlink:href="' + path_details[0].icon_url + '"></svg>'
    div+= '<select id="rp_sel" name="rel_path" class="text-primary alert-primary py-1 border border-primary rounded" onChange="change_rp_sel()">'
    for(p of path_details) {
        div+= `<option path_type="${p.type.name}" icon_url="${p.icon_url}" ${(p.type.name=='Storage') ? "selected" : ""}>${p.root_dir}</option>`
    }
    div+= '</select>'
    div+=`
        </alert>
        <input id="prefix" type="text" name="prefix" class="text-primary text-right form-control"
        `
    div+="value="+yr+'/'+dt+"-"
    div+=`
        "></input>
        <input id="suffix" type="text" name="suffix" class="form-control" placeholder="name"> </input>
        </div>
        <div class="form-row col-12 mt-2">
            <button onClick="$('#dbox').modal('hide'); return false;" class="btn btn-outline-secondary offset-1 col-2">Cancel</button>
            <button onClick="
                $.ajax({ type: 'POST', data: $('#mv_fm').serialize(), url: '/move_files',
                        success: function(data) {
                            processAmendments( data.job.amendments )
                            checkForAmendmentJobToComplete(data.job.id)
                        }
                });
                $('#dbox').modal('hide')
                return false"
                class="btn btn-outline-secondary col-2">Ok</button>
        </div>
        </form>
    `

    $('#dbox-content').html(div)
    $('#dbox').modal('show')
    $("#prefix").keypress(function (e) { if (e.which == 13) { $("#move_submit").click(); return false; } } )
    $("#suffix").keypress(function (e) { if (e.which == 13) { $("#move_submit").click(); return false; } } )
}

// This function is called anytime we have a job that returns amendments
// (visually we want to show this entry is being amended by a job)
// as we check for a job to end every second, we can call this multiple times
// during the runtime of a job, so only redraw/react to a new amendment
// NOTE: we update all views, as we might go into one via jscript before the job ends
function processAmendments( ams )
{
    for (const am of ams)
    {
        // if we return anything here, we already have this amendment, so continue to next
        if( document.amendments.filter(obj => obj.eid === am.eid).length > 0 )
            continue

        document.amendments.push(am)

        if( document.viewing && document.viewing.id == am.eid )
        {
            im.src=im.src + '?t=' + new Date().getTime();
            DrawImg()
        }

        // find where in the page this image is being viewed
        idx = pageList.indexOf(am.eid)
        // createFigureHtml uses matching document.amendments to show thobber, etc
        html = createFigureHtml( document.entries[idx] )
        $('#'+am.eid).replaceWith( html )
    }
}

// function to add data for document.amendment based on id and amt
// used when we transform several images in files_*, or single image in viewer
// show the DBox for a delete/restore file, includes all thumbnails of selected files 
// with appropriate coloured button to Delete or Restore files
function DelDBox(del_or_undel)
{
    to_del = GetSelnAsData()
    $('#dbox-title').html(del_or_undel+' Selected File(s)')
    div ='<div class="row col-12"><p class="col">' + del_or_undel + ' the following files?</p></div>'
    div+=GetSelnAsDiv()
    if( del_or_undel == "Delete" )
    {
        which="delete"
        col="danger"
    }
    else
    {
        which="restore"
        col="sucess"
    }

    document.ents_to_del=[]
    $('.highlight').each(function( cnt ) { document.ents_to_del[cnt]=parseInt($(this).attr('id')) } )
    div+=`<div class="row col-12 mt-3">
            <button onClick="$('#dbox').modal('hide')" class="btn btn-outline-secondary col-2">Cancel</button>
            <button onClick="
                $.ajax({ type: 'POST', data: to_del, url: '/${which}_files',
                        success: function(data) {
                            processAmendments( data.job.amendments )
                            checkForAmendmentJobToComplete(data.job.id)
                        }
                });
                $('#dbox').modal('hide')
                return false"
                class="btn btn-outline-${col} col-2">Ok</button>
        </div>`
    $('#dbox-content').html(div)
    $('#dbox').modal('show')
}

// show the DBox for a lame quick version of file details 
function DetailsDBox()
{
    $('#dbox-title').html('Details of Selected File(s)')  
    var div ='<div class="row col-12">'
    $('.highlight').each(function( index ) { 
            div += "<div class='col-3' style='background-color:lightgray'>Name:</div><div class='col-9' style='background-color:lightgray'>" + $(this).attr('fname') + "</div>"
            div += "<div class='col-3'>Date:</div><div class='col-9'>" + $(this).attr('pretty_date') + "</div>"
            dir = $(this).attr('in_dir')
            if( dir.slice(-1) != "/" )
                dir=dir.concat('/')
            div += "<div class='col-3'>Dir:</div><div class='col-9'>" + dir + "</div>"
            div += "<div class='col-3'>Size:</div><div class='col-9'>" + $(this).attr('size') + " MB</div>"
            div += "<div class='col-3'>Hash:</div><div class='col-9'>" + $(this).attr('hash') + "</div>"
            div += "<div class='col-3'>Path Type:</div><div class='col-9'>" + $(this).attr('path_type') + "</div>"
        } )
        div += `
            </div>
            <br>
            <div class="form-row col-12">
                <button onClick="$('#dbox').modal('hide'); return false;" class="btn btn-outline-secondary offset-1 col-2">Cancel</button>
            </div>
        `
    $('#dbox-content').html(div)
    $('#dbox').modal('show')
}


// DoSel is called when a click event occurs, and sets the selection via adding 
// 'highlight' to the class of the appropriate thumbnails
// e == event (can see if shift/ctrl held down while left-clicking
// el == element the click is on
// this allows single-click to select, ctrl-click to (de)select 1 item, and
// shift-click to add all elements between highlighted area and clicked el,
// whether you click before highlight or after, or inside a gap and then back
// or forward to the closest higlighted entry - also, only works on entry class,
// so it ignores figures that we take entry off while we transform, etc it
function DoSel(e, el) {
    const id = $(el).attr('id');
    const entries = $('.entry');

    // Collect currently highlighted entries
    const currentHighlights = $('.highlight');
    const highlighted = new Set();
    currentHighlights.each(function() {
        highlighted.add($(this).attr('id'));
    });

    // Ctrl+click: toggle highlight for the clicked entry
    if (e.ctrlKey || document.fake_ctrl === 1) {
        $(el).toggleClass('highlight');
        if (highlighted.has(id)) {
            highlighted.delete(id);
        } else {
            highlighted.add(id);
        }
        if (document.fake_ctrl === 1) {
            document.fake_ctrl = 0;
        }
        return;
    }
    // Shift+click: select a range
    else if (e.shiftKey || document.fake_shift === 1) {
        if (currentHighlights.length === 0) {
            // If no highlights, just highlight the clicked entry
            $(el).addClass('highlight');
            highlighted.add(id);
        } else {
            // Find the nearest highlighted entry
            const clickedIndex = entries.index($(el));
            let nearestHighlightIndex = -1;
            let minDistance = Infinity;

            currentHighlights.each(function() {
                const highlightIndex = entries.index($(this));
                const distance = Math.abs(highlightIndex - clickedIndex);
                if (distance < minDistance) {
                    minDistance = distance;
                    nearestHighlightIndex = highlightIndex;
                }
            });

            // Highlight the range between the nearest highlighted entry and the clicked entry
            const from = Math.min(clickedIndex, nearestHighlightIndex);
            const to = Math.max(clickedIndex, nearestHighlightIndex);

            for (let i = from; i <= to; i++) {
                const entryId = entries.eq(i).attr('id');
                highlighted.add(entryId);
                entries.eq(i).addClass('highlight');
            }
        }
        if (document.fake_shift === 1) {
            document.fake_shift = 0;
        }
        return;
    }
    // Single click: clear all highlights and highlight the clicked entry
    else {
        $('.highlight').removeClass('highlight');
        highlighted.clear();
        $(el).addClass('highlight');
        highlighted.add(id);
    }
}

// if a selection exists, enable move & del/restore buttons otherwise disable them
function SetButtonState() {
    var sel=false
    $('.highlight').each(function( index ) { sel=true } )
    if( sel ) {
        $('#move').attr('disabled', false )
        $('#del').attr('disabled', false )
    } else {
        $('#move').attr('disabled', true )
        $('#del').attr('disabled', true )
    }
}

// Check if the set of highlights are either only figures, dirs or both
// used to work out what options are shown in the file context menu
function FiguresOrDirsOrBoth() {
    var figure=false
    var dir=false
    $('.highlight').each(function( index ) { 
        if( $(this).hasClass('figure') ) {
            figure=true
        } 
        if( $(this).hasClass('dir') ) {
            dir=true
        } 
    } )
    if( figure & ! dir )
        return "figure"
    if( ! figure & dir )
        return "dir"
    return "both"
}

// Check if the set of highlights contain Bin and Not Bin...
// if its both, then no del/restore is possible in context menu
// otherwise can either set del or restore appropriately
function SelContainsBinAndNotBin() {
    var bin=false
    var not_bin=false
    $('.highlight').each(function( index ) { 
        if( $(this).attr('path_type') == "Bin" ) {
            bin=true
        } else {
            not_bin=true
        }
    } )
    if( bin && not_bin )
        return true
    else
        return false
}

// checks to see if there is no selection active
function NoSel() {
    var sel=false
    $('.highlight').each(function( index ) { sel=true } )
    // func looks for No Selection, so if sel is true and we have a sel, return false (i.e. NOT No Sel -> Sel )
    if( sel )
        return false
    else
        return true
}

// quick wrapper to add a single <figure> to the #figures div
function addFigure( obj )
{
    html=createFigureHtml( obj )
    $('#figures').append( html )
}

/**
 * Renders a group header or entry based on the object and options.
 * obj - The object containing file/directory details.
 * returns {string} - Generated HTML string.
 */
function createFigureHtml( obj )
{
    // if am is null, no amendment for this obj, otherwise we have one
    var am=null
    for (const tmp of document.amendments)
        if( tmp.eid == obj.id )
            am=tmp

    let html = "";

    // Image/Video/Unknown entry
    if (obj.type.name === "Image" || obj.type.name === "Video" || obj.type.name === "Unknown") {
        const pathType = obj.in_dir.in_path.type.name;
        const size = obj.file_details.size_mb;
        const hash = obj.file_details.hash;
        const inDir = `${obj.in_dir.in_path.path_prefix}/${obj.in_dir.rel_path}`;
        const fname = obj.name;
        const yr = obj.file_details.year;
        const date = `${yr}${String(obj.file_details.month).padStart(2, '0')}${String(obj.file_details.day).padStart(2, '0')}`;
        const prettyDate = `${obj.file_details.day}/${obj.file_details.month}/${obj.file_details.year}`;
        const type = obj.type.name;

        // if amendment for this obj, do not add entry class - prevents highlighting
        if( am ) {
            ent=""
            gs="style='filter: grayscale(100%);'"
            am_html ='<img class="position-absolute top-50 start-50 translate-middle" height="60" src="/internal/white-circle.png">'
            am_html+='<img class="position-absolute top-50 start-50 translate-middle" height="64" src="/internal/throbber.gif">'
            if( am.type.which == 'icon' )
                am_html+=`<svg class="position-absolute top-50 start-50 translate-middle" height="32" style="color:${am.type.colour}" fill="${am.type.colour}"><use xlink:href="/internal/icons.svg#${am.type.what}"></use></svg>`
            else
                am_html+=`<img class="position-absolute top-50 start-50 translate-middle" src="/internal/${am.type.what}?v={{js_vers['r270']}}" height="32">`
        } else {
            ent="entry"
            gs=""
            am_html=""
        }
        html += `
            <figure id="${obj.id}" class="col col-auto g-0 figure ${ent} m-1"
                path_type="${pathType}" size="${size}" hash="${hash}" in_dir="${inDir}"
                fname="${fname}" yr="${yr}" date="${date}" pretty_date="${prettyDate}" type="${type}">
                ${renderMedia(obj,gs,am_html)}
            `
    }
    // Directory entry
    else if (obj.type.name === "Directory" && OPT.folders) {
        const dirname = obj.dir_details.rel_path.length
          ? `${obj.dir_details.in_path.path_prefix}/${obj.dir_details.rel_path}`
          : obj.dir_details.in_path.path_prefix;

        html += `
            <figure class="col col-auto g-0 dir entry m-1" id="${obj.id}" dir="${dirname}" type="Directory">
            <svg class="svg" width="${OPT.size - 22}" height="${OPT.size - 22}" fill="currentColor">
            <use xlink:href="/internal/icons.svg#Directory"></use>
            </svg>
            <figcaption class="svg_cap figure-caption text-center text-wrap text-break">${obj.name}</figcaption>
        `;
        html += `<script>f=$('#${obj.id}'); w=f.find('svg').width(); f.find('figcaption').width(w);</script>`;
    }
    // moved the bindings to here as we need to reset them if we recreate this Figure (after a transform job)
    html += `<script>
        if( "${obj.type.name}" === "Directory" ) {
            $("#${obj.id}").click( function(e) { document.back_id=this.id; getDirEntries(this.id,false) } )
        } else {
            $('#${obj.id}').click( function(e) { DoSel(e, this ); SetButtonState(); return false; });
            $('#${obj.id}').dblclick( function(e) { startViewing( $(this).attr('id') ) } )
        }
    </script>
    </figure>`
    return html
}

// Helper function to render media (image/video/unknown)
function renderMedia(obj,gs,am_html) {
  const isImageOrUnknown = obj.type.name === "Image" || obj.type.name === "Unknown";
  const isVideo = obj.type.name === "Video";
  const path = `${obj.in_dir.in_path.path_prefix}/${obj.in_dir.rel_path}/${obj.name}`;
  const thumb = obj.file_details.thumbnail
    ? `<a href="${path}"><img alt="${obj.name}" ${gs} class="thumb" height="${OPT.size}" src="data:image/jpeg;base64,${obj.file_details.thumbnail}"></a>`
    : `<a href="${path}"><svg width="${OPT.size}" height="${OPT.size}" fill="white"><use xlink:href="/internal/icons.svg#unknown_ftype"/></svg></a>`;

  let mediaHtml = `<div style="position:relative; width:100%">${thumb}${am_html}`;

  if (isVideo) {
    mediaHtml += `
      <div style="position:absolute; top: 0px; left: 2px;">
        <svg width="16" height="16" fill="white"><use xlink:href="/internal/icons.svg#film"/></svg>
      </div>
    `;
  }
  if (OPT.search_term) {
      mediaHtml += `
        <div style="position:absolute; bottom: 0px; left: 2px;">
          <svg width="16" height="16" fill="white"><use xlink:href="/internal/icons.svg#${getLocationIcon(obj)}"/></svg>
        </div>
      `;
  }

  mediaHtml += `</div>`;
  return mediaHtml;
}

// Helper: Get location icon (placeholder)
function getLocationIcon(obj) {
    return ICON[obj.in_dir.in_path.type.name]
}

// POST to get entry ids, and then getPage for a specified directory
function getDirEntries(dir_id, back)
{
    data={}
    data.dir_id=dir_id
    data.back=back
    data.noo=OPT.noo

    $.ajax({
        type: 'POST',
        url: '/get_dir_eids',
        data: JSON.stringify(data),
        contentType: 'application/json',
        dataType: 'json',
        success: function(res) {
            if( res.valid === false )
            {
                $('#figures').html( "<alert class='alert alert-danger'>ERROR! directory has changed since you loaded this view.  You have to reload and reset your view (probably someone deleted the directory or its parent since you loaded this page)" )
                return
            }
            entryList=res.entry_list
            pageList=entryList.slice(0, OPT.how_many)
            // now go get actual data/entries
            getPage(1,getPageFigures)
        },
        error: function(xhr, status, error) {
            console.error("Error:", error);
        }
    });
}

// this function draws all the figures from document.entries - called when we
// change pages, but also when we change say grouping/other OPTs
function drawPageOfFigures()
{
    $('#figures').empty()
    var last = { printed: null }

    // something is up, let the user know
    if( document.alert )
        $('#figures').append( document.alert )

    if( OPT.folders )
    {
        // it root_eid is 0, then no entries in this path - cant go up
        if( OPT.root_eid == 0  || (document.entries.length && document.entries[0].in_dir.eid == OPT.root_eid ) ) 
        {
            gray="_gray"
            back=""
            cl=""
            back_id=0
        }
        else
        {
            gray=""
            back="Back"
            cl="back"
            if( document.entries.length > 0 )
                back_id = document.entries[0].in_dir.eid
            else
                back_id = document.back_id
        }
        // back button, if gray/back decide if we see grayed out folder and/or the name of the folder we go back to
        // with clas "back" this gets a different click handler which flags server to return data by 'going back/up' in dir tree
        // we give the server the id of the first item on the page so it can work out how to go back
        html=`<div class="col col-auto g-0 m-1">
                <figure id="${back_id}" class="${cl} entry m-1" type="Directory">
                    <svg class="svg" width="${OPT.size-22}" height="${OPT.size-22}">
                        <use xlink:href="internal/icons.svg#folder_back${gray}"/>
                    </svg>
                    <figcaption class="figure-caption text-center">${back}</figcaption>
                </figure>
             </div>`
        $('#figures').append(html)
    }
    for (const obj of document.entries) {
        // Grouping logic
        if (OPT.grouping === "Day") {
            if (last.printed !== obj.file_details.day) {
                $('#figures').append(`<div class="row ps-3"><h6>Day: ${obj.file_details.day} of ${obj.file_details.month}/${obj.file_details.year}</h6></div>` );
                last.printed = obj.file_details.day;
            }
        } else if (OPT.grouping === "Week") {
            if (last.printed !== obj.file_details.woy) {
                $('#figures').append(`<div class="row ps-3"><h6>Week #: ${obj.file_details.woy} of ${obj.file_details.year}</h6></div>` );
                last.printed = obj.file_details.woy;
            }
        } else if (OPT.grouping === "Month") {
            if (last.printed !== obj.file_details.month) {
                $('#figures').append(`<div class="row ps-3"><h6>Month: ${obj.file_details.month} of ${obj.file_details.year}</h6></div>` );
                last.printed = obj.file_details.month;
            }
        }
        addFigure( obj )
    }
    $(".back").click( function(e) { getDirEntries(this.id,true) } )
    if( document.entries.length == 0 )
        if( OPT.search_term )
            $('#figures').append( `<span class="alert alert-danger p-2 col-auto"> No matches for: '${OPT.search_term}'</span>` )
        else if( OPT.root_eid == 0 )
            $('#figures').append( `<span class="alert alert-danger p-2 col-auto d-flex align-items-center">No files in Path!</span>` )
}

// emtpy out file_list_div, and repopulate it with new page of content
function getPageFileList(res, viewingIdx)
{
    $('#file_list_div').empty()

    // something is up, let the user know
    if( document.alert )
        $('#file_list_div').append( '<div class="row">' + document.alert + '</div>' )

    if( OPT.root_eid == 0 )
    {
        $('#file_list_div').append( `<span class="alert alert-danger p-2">No files in Path!</span>` )
        return
    }
    html='<table class="table table-striped table-sm col-12">'
    html+='<thead><tr class="table-primary"><th>Name</th><th>Size (MB)</th><th>Path Prefix</th><th>Hash</th></tr></thead><tbody>'
    for (const obj of res) {
        html+=`<tr>
                <td>
                <div class="d-flex align-items-center">
                  <a href="${obj.in_dir.in_path.path_prefix}/${obj.in_dir.rel_path}/${obj.name}">
                    <img class="img-fluid me-2" style="max-width: 100px;"
                      src="data:image/jpeg;base64,${obj.file_details.thumbnail}"></img>
                  </a>
                  <span>${obj.name}</span>
                </div>
                <td>${obj.file_details.size_mb}</td>
                <td>${obj.in_dir.in_path.path_prefix.replace("static/","")}/${obj.in_dir.rel_path}</td>
                <td>${obj.file_details.hash}</td>
             </tr>`
    }
    html+='</tbody></table>'
    $('#file_list_div').append(html)
}

// wrapper function as we want to handle real DB query success, but also do the 
// same when we just use cache
function getEntriesByIdSuccessHandler(res,pageNumber,successCallback,viewingIdx)
{
    if( res.length != pageList.length )
        document.alert="<alert class='alert alert-warning'>WARNING: something has changed since viewing this page (likely someone deleted content in another view), strongly suggest a page reload to get the latest data</alert>"
    
    document.entries=res;
    // cache this
    document.page[pageNumber]=res
    // FIXME: I want to remove successCallback, instead: if viewing, or files_*, or file_list, then call relevant draw routine
    successCallback(res,viewingIdx)
    resetNextPrevButtons()
    // if search, disable folders
    if( OPT.search_term )
         $('#folders').prop('disabled', 'disabled').removeClass('border-info').addClass('border-secondary').removeClass('text-info').addClass('text-secondary');
    else if( document.entries.length == 0 )
    {
        html=`<span class="alert alert-danger p-2 col-auto">No files in Path</span>`
        $('#file_list_div').append(html)
        $('#figures').append(html)
    }
}

// Function to get the 'page' of entry ids out of entryList
function getPage(pageNumber, successCallback, viewingIdx=0)
{
    // before we do anything, disabled left/right arrows on viewer to stop
    // getting another event before we have the data for the page back
    $('#la').prop('disabled', true)
    $('#ra').prop('disabled', true)
    const startIndex = (pageNumber - 1) * OPT.how_many;
    const endIndex = startIndex + OPT.how_many;
    pageList = entryList.slice(startIndex, endIndex);
    
    // set up data to send to server to get the entry data for entries in pageList
    data={}
    data.ids = pageList

    // assume nothing wrong, but if the data goes odd, then this will be non-null and displayed later (cant add here, as later code does .empty() of file divs)
    document.alert=null
    // see if we can use cache, and dont reload from DB
    if( !OPT.folders && document.page.length && document.page[pageNumber] )
    {
        getEntriesByIdSuccessHandler( document.page[pageNumber], pageNumber, successCallback, viewingIdx )
        return
    }

    $.ajax({
        type: 'POST', url: '/get_entries_by_ids',
        data: JSON.stringify(data), contentType: 'application/json',
        dataType: 'json',
        success: function(res) {
            document.amendments=res.amendments;
            // only called when an amendment is pending & we are viewing a page in files/list view
            // so check for amendment job(s) ending...
            for (const tmp of document.amendments)
                checkForAmendmentJobToComplete(tmp.job_id)
            getEntriesByIdSuccessHandler( res.entries, pageNumber, successCallback, viewingIdx ) 
        },
        error: function(xhr, status, error) { console.error("Error:", error); } });
    return
}

// Quick Function to check if we are on the first page
function isFirstPage(pageNumber) 
{
    return pageNumber <= 1;
}

// Function to check if we are on the last page
function isLastPage(pageNumber) 
{
    const totalPages = Math.ceil(entryList.length / OPT.how_many);
    return pageNumber >= totalPages;
}

// given an id in the list, return which page we are on (page 1 is first page)
function getPageNumberForId(id) {
    const idx = entryList.indexOf(id);
    // should be impossible but jic
    if (idx === -1) { return -1 }
    return Math.floor(idx / OPT.how_many) + 1;
}

// if we are on first page, disable prev, it not ensure next is enabled
// if we are on last page, disable next, it not ensure prev is enabled
function resetNextPrevButtons()
{
    // no data, so disabled both
    if( getPageNumberForId(pageList[0]) == -1 )
    {
        $('.prev').prop('disabled', true).addClass('disabled');
        $('.next').prop('disabled', true).addClass('disabled');
        return
    }
    if ( isFirstPage( getPageNumberForId(pageList[0]) ) )
        $('.prev').prop('disabled', true).addClass('disabled');
    else
        $('.prev').prop('disabled', false).removeClass('disabled');

    if ( isLastPage( getPageNumberForId(pageList[0]) ) )
        $('.next').prop('disabled', true).addClass('disabled');
    else
        $('.next').prop('disabled', false).removeClass('disabled');
}

// get list of eids for the next page, also make sure next/prev buttons make sense for page we are on
function nextPage(successCallback)
{
    // pageList[0] is the first entry on this page
    const currentPage=getPageNumberForId( pageList[0] )
    // should never happen / just return pageList unchanged
    if ( currentPage === -1 || isLastPage( currentPage ) )
    {
        console.error( "WARNING: seems first on pg=" + pageList[0] + " of how many=" + OPT.how_many + " gives currentPage=" + currentPage + " and we cant go next page?" )
        return
    }
    getPage( currentPage+1, successCallback )
    return
}

// get list of eids for the prev page, also make sure next/prev buttons make sense for page we are on
function prevPage(successCallback)
{
    // pageList[0] is the first entry on this page
    const currentPage=getPageNumberForId( pageList[0] )
    // should never happen / just return pageList unchanged
    if (currentPage === 1 || currentPage === -1 )
    {
        console.error( "WARNING: seems first on pg=" + pageList[0] + " of how many=" + OPT.how_many + " gives currentPage=" + currentPage + " and we cant go prev page?" )
        return
    }
    getPage( currentPage-1, successCallback )
    return
}

// function to see if we are on a phone or tablet (where we dont have ctrl or shift keys - helps to display fake buttons to allow multiselect on mobiles)
function isMobile() {
    try{ document.createEvent("TouchEvent"); return true; }
    catch(e){ return false; }
}

// when we change one of the options (noo, how_many, folders) - then update '{how_many} files' str,
// tweak noo menu for folders/flat view then reset the page contents based on current OPT values
function changeOPT(successCallback) {
    OPT.how_many=$('#how_many').val()
    // changes invalidate page cache so clear it out
    document.page.length=0
    new_f=$('#folders').val()
    new_f=( new_f == 'True' )
    // if change to/from folders, also fix the noo menu
    if( new_f != OPT.folders )
    {
        if( new_f )
        {
            $('#noo option:lt(2)').prop('disabled', true);
            $('#noo').val(OPT.default_folder_noo)
        }
        else
        {
            $('#noo option:lt(2)').prop('disabled', false);
            $('#noo').val(OPT.default_flat_noo)
        }
    }
    OPT.noo=$('#noo').val()
    OPT.folders=new_f
    OPT.folders=$('#folders').val()
    OPT.grouping=$('#grouping').val()
    OPT.size=$('input[name="size"]:checked').val();
    $.ajax({
        type: 'POST',
        url: '/change_file_opts',
        data: JSON.stringify(OPT),
        contentType: 'application/json',
        success: function(resp) {
            entryList=resp.query_data.entry_list
            OPT.how_many=parseInt(OPT.how_many)
            pageList=entryList.slice(0, OPT.how_many)
            // put data back into booleans, ints, etc
            OPT.folders=( OPT.folders == 'True' )
            $('.how_many_text').html( `&nbsp;${OPT.how_many} files&nbsp;` )
            OPT.size=parseInt(OPT.size)
            getPage(1,successCallback)
        }
    })
}

// function to change the size of thumbnails when user clicks xs/s/m/l/xl buttons
function changeSize()
{
    sz=$('input[name="size"]:checked').val();
    OPT.size=sz
	$('.thumb').attr( {height: sz, style: 'font-size:'+sz+'px' } )
	$('#size').val(sz)
    sz=sz-22
    $('.svg').height(sz);
    $('.svg').width(sz);
    $('.svg_cap').width(sz);
}

// when a delete or restore files job has completed successfullly, then get ids
// find the page we are on, remove amendments & ids from entryList and re-get page
// which will reset pageList and the UI of images for that page
function handleMoveOrDeleteOrRestoreFileJobCompleted(job)
{
    // this grabs the values from the object attributes of eid-0, eid-1, etc.
    const ids = job.extra.filter(item => item.name.startsWith("eid-")).map(item => item.value);

    // find page number of first element to delete (this is the page we will return too)
    pnum=getPageNumberForId( ids[0] )

    // remove amendment data
    for (const ent of ids)
    {
        id=parseInt(ent)
        removeAmendment( id )
        // remove the item in the entryList
        index=entryList.indexOf(id);
        if( index != -1 )
            entryList.splice(index, 1); // Remove the element
        else
        {
            return; // have to get out of here, or calling getPage() below will loop forever
        }
    }

    // re-create pageList by reloading the page
    getPage(pnum,getPageFigures)
}

// POST to a check URL, that will tell us if the amendment job has completed,
// it also calls CheckForJobs() which will fix up the Active Jobs badge,
function checkForAmendmentJobToComplete(job_id)
{
    CheckForJobs()
    $.ajax( { type: 'POST', data: '&job_id='+job_id, url: '/check_amend_job_status',
        success: function(res) { handleCheckAmendmentJobStatus(res); } } )
}

// the status of a Amendment Job has been returned, finished is True/False
// if not finished try again in 1 second... If finished then invalidate page
// cache and based on job type call code correct func to update the UI appropriately
function handleCheckAmendmentJobStatus(data)
{
    if( data.finished )
    {
        // invalidate the cache
        document.page.length=0

        // transforms contain the single transformed entry data for convenience
        if( data.job.name == 'transform_image' )
            handleTransformImageJobCompleted(data.job, data.entry)
        else if ( data.job.name == 'delete_files' || data.job.name == 'restore_files' || data.job.name == 'move_files' )
            handleMoveOrDeleteOrRestoreFileJobCompleted(data.job)
    }
    else { setTimeout( function() { checkForAmendmentJobToComplete(data.job.id) }, 1000 ); }
}

// different context menu on files
$.contextMenu({
    selector: '.entry',
    itemClickEvent: "click",
    build: function($triggerElement, e) {
        // when right-clicking & no selection add one OR deal with ctrl/shift right-lick as it always changes seln
        if( NoSel() || e.ctrlKey || e.shiftKey )
        {
            DoSel(e, e.currentTarget )
            SetButtonState();
        }

        if( FiguresOrDirsOrBoth() == "figure" )
        {
            item_list = {
                details: { name: "Details..." },
                view: { name: "View File" },
                sep: "---",
            }
            if( e.currentTarget.getAttribute('type') == 'Image' )
            {
                item_list['transform'] = {
                    name: "Transform",
                    items: {
                        "r90": { "name" : "Rotate 90 degrees" },
                        "r180": { "name" : "Rotate 180 degrees" },
                        "r270": { "name" : "Rotate 270 degrees" },
                        "fliph": { "name" : "Flip horizontally" },
                        "flipv": { "name" : "Flip vertically" }
                    }
                }

            }
            item_list['move'] = { name: "Move selected file(s) to new folder" }
            item_list['sep2'] = { sep: "---" }
        }
        else
            item_list = {
                move: { name: "Move selection(s) to new folder" }
            }

        item_list['ai'] = {
            name: "Scan file for faces",
            items: {
                "ai-all": { name: "all" }
            }
        };

        // Dynamically add entries for each person in the `people` array
        people.forEach(person => {
            item_list['ai'].items[`ai-${person.tag}`] = { name: person.tag };
        });

        if( SelContainsBinAndNotBin() ) {
            item_list['both']= { name: 'Cannot delete and restore at same time', disabled: true }
        } else {
            if (e.currentTarget.getAttribute('path_type') == 'Bin' )
                item_list['undel']= { name: "Restore selected file(s)" }
            else if( e.currentTarget.getAttribute('type') != 'Directory' )
                item_list['del']= { name: "Delete Selected file(s)" }
        }

        return {
            callback: function( key, options) {
                if( key == "details" ) { DetailsDBox() }
                if( key == "view" ) { startViewing( $(this).attr('id') ) }
                if( key == "move" ) { MoveDBox(move_paths) }
                if( key == "del"  ) { DelDBox('Delete') }
                if( key == "undel") { DelDBox('Restore') }
                if( key == "r90"  ) { Transform(90) }
                if( key == "r180" ) { Transform(180) }
                if( key == "r270" ) { Transform(270) }
                if( key == "fliph" ) { Transform("fliph") }
                if( key == "flipv" ) { Transform("flipv") }
                if( key.startsWith("ai")) { RunAIOnSeln(key) }
                // dont flow this event through the dom
                e.stopPropagation()
            },
            items: item_list
        };
    }
});

// finally, for files_ip/files_sp/files_rbp - set click inside document (NOT an entry) to remove seln
$(document).on('click', function(e) { $('.highlight').removeClass('highlight') ; SetButtonState() });
document.page=[]