<!DOCTYPE html>
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<html>
<head>
        <title>Journal</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        <style type="text/css">
                div#divlogs, div#diventry {
                        font-family: monospace;
                        font-size: 7pt;
                        background-color: #ffffff;
                        padding: 1em;
                        margin: 2em 0em;
                        border-radius: 10px 10px 10px 10px;
                        border: 1px solid threedshadow;
                        white-space: nowrap;
                        overflow-x: scroll;
                }
                div#diventry {
                        display: none;
                }
                div#divlogs {
                        display: block;
                }
                body {
                        background-color: #ededed;
                        color: #313739;
                        font: message-box;
                        margin: 3em;
                }
                td.timestamp {
                        text-align: right;
                        border-right: 1px dotted lightgrey;
                        padding-right: 5px;
                }
                td.process {
                        border-right: 1px dotted lightgrey;
                        padding-left: 5px;
                        padding-right: 5px;
                }
                td.message {
                        padding-left: 5px;
                }
                td.message > a:link, td.message > a:visited {
                        text-decoration: none;
                        color: #313739;
                }
                td.message-error {
                        padding-left: 5px;
                        color: red;
                        font-weight: bold;
                }
                td.message-error > a:link, td.message-error > a:visited {
                        text-decoration: none;
                        color: red;
                }
                td.message-highlight {
                        padding-left: 5px;
                        font-weight: bold;
                }
                td.message-highlight > a:link, td.message-highlight > a:visited {
                        text-decoration: none;
                        color: #313739;
                }
                td > a:hover, td > a:active {
                        text-decoration: underline;
                        color: #c13739;
                }
                table#tablelogs, table#tableentry {
                        border-collapse: collapse;
                }
                td.field {
                        text-align: right;
                        border-right: 1px dotted lightgrey;
                        padding-right: 5px;
                }
                td.data {
                        padding-left: 5px;
                }
                div#keynav {
                        text-align: center;
                        font-size: 7pt;
                        color: #818789;
                        padding-top: 2em;
                }
                span.key {
                        font-weight: bold;
                        color: #313739;
                }
                div#buttonnav {
                        text-align: center;
                }
                button {
                        font-size: 18pt;
                        font-weight: bold;
                        width: 2em;
                        height: 2em;
                }
                div#filternav {
                        text-align: center;
                }
                select {
                        width: 50em;
                }
        </style>
</head>

<body>
        <!-- TODO:
                - live display
                - show red lines for reboots -->

        <h1 id="title"></h1>

        <div id="os"></div>
        <div id="virtualization"></div>
        <div id="cutoff"></div>
        <div id="machine"></div>
        <div id="usage"></div>
        <div id="showing"></div>

        <div id="filternav">
                <select id="filter" onchange="onFilterChange(this);" onfocus="onFilterFocus(this);">
                        <option>No filter</option>
                </select>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <input id="boot" type="checkbox" onchange="onBootChange(this);">Only current boot</input>
        </div>

        <div id="divlogs"><table id="tablelogs"></table></div>
        <a name="entry"></a>
        <div id="diventry"><table id="tableentry"></table></div>

        <div id="buttonnav">
                <button id="head" onclick="entriesLoadHead();" title="First Page">&#8676;</button>
                <button id="previous" type="button" onclick="entriesLoadPrevious();" title="Previous Page"/>&#8592;</button>
                <button id="next" type="button" onclick="entriesLoadNext();" title="Next Page"/>&#8594;</button>
                <button id="tail" type="button" onclick="entriesLoadTail();" title="Last Page"/>&#8677;</button>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <button id="more" type="button" onclick="entriesMore();" title="More Entries"/>+</button>
                <button id="less" type="button" onclick="entriesLess();" title="Fewer Entries"/>-</button>
        </div>

        <div id="keynav">
                <span class="key">g</span>: First Page &nbsp;&nbsp;&nbsp;&nbsp;
                <span class="key">&#8592;, k, BACKSPACE</span>: Previous Page &nbsp;&nbsp;&nbsp;&nbsp;
                <span class="key">&#8594;, j, SPACE</span>: Next Page &nbsp;&nbsp;&nbsp;&nbsp;
                <span class="key">G</span>: Last Page &nbsp;&nbsp;&nbsp;&nbsp;
                <span class="key">+</span>: More entries &nbsp;&nbsp;&nbsp;&nbsp;
                <span class="key">-</span>: Fewer entries
        </div>

        <script type="text/javascript">
                var first_cursor = null;
                var last_cursor = null;

                function getNEntries() {
                        var n;
                        n = localStorage["n_entries"];
                        if (n == null)
                                return 50;
                        n = parseInt(n);
                        if (n < 10)
                                return 10;
                        if (n > 1000)
                                return 1000;
                        return n;
                }

                function showNEntries(n) {
                        var showing = document.getElementById("showing");
                        showing.innerHTML = "Showing <b>" + n.toString() + "</b> entries.";
                }

                function setNEntries(n) {
                        if (n < 10)
                                return 10;
                        if (n > 1000)
                                return 1000;
                        localStorage["n_entries"] = n.toString();
                        showNEntries(n);
                }

                function machineLoad() {
                        var request = new XMLHttpRequest();
                        request.open("GET", "machine");
                        request.onreadystatechange = machineOnResult;
                        request.setRequestHeader("Accept", "application/json");
                        request.send(null);
                }

                function formatBytes(u) {
                        if (u >= 1024*1024*1024*1024)
                                return (u/1024/1024/1024/1024).toFixed(1) + " TiB";
                        else if (u >= 1024*1024*1024)
                                return (u/1024/1024/1024).toFixed(1) + " GiB";
                        else if (u >= 1024*1024)
                                return (u/1024/1024).toFixed(1) + " MiB";
                        else if (u >= 1024)
                                return (u/1024).toFixed(1) + " KiB";
                        else
                                return u.toString() + " B";
                }

                function escapeHTML(s) {
                        return s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
                }

                function machineOnResult(event) {
                        if ((event.currentTarget.readyState != 4) ||
                                (event.currentTarget.status != 200 && event.currentTarget.status != 0))
                                return;

                        var d = JSON.parse(event.currentTarget.responseText);

                        var title = document.getElementById("title");
                        title.innerHTML = 'Journal of ' + escapeHTML(d.hostname);
                        document.title = 'Journal of ' + escapeHTML(d.hostname);

                        var machine = document.getElementById("machine");
                        machine.innerHTML = 'Machine ID is <b>' + d.machine_id + '</b>, current boot ID is <b>' + d.boot_id + '</b>.';

                        var cutoff = document.getElementById("cutoff");
                        var from = new Date(parseInt(d.cutoff_from_realtime) / 1000);
                        var to = new Date(parseInt(d.cutoff_to_realtime) / 1000);
                        cutoff.innerHTML = 'Journal begins at <b>' + from.toLocaleString() + '</b> and ends at <b>' + to.toLocaleString() + '</b>.';

                        var usage = document.getElementById("usage");
                        usage.innerHTML = 'Disk usage is <b>' + formatBytes(parseInt(d.usage)) + '</b>.';

                        var os = document.getElementById("os");
                        os.innerHTML = 'Operating system is <b>' + escapeHTML(d.os_pretty_name) + '</b>.';

                        var virtualization = document.getElementById("virtualization");
                        virtualization.innerHTML = d.virtualization == "bare" ? "Running on <b>bare metal</b>." : "Running on virtualization <b>" + escapeHTML(d.virtualization) + "</b>.";
                }

                function entriesLoad(range) {

                        if (range == null) {
                                if (localStorage["cursor"] != null && localStorage["cursor"] != "")
                                        range = localStorage["cursor"] + ":0";
                                else
                                        range = "";
                        }

                        var url = "entries";

                        if (localStorage["filter"] != "" && localStorage["filter"] != null) {
                                url += "?_SYSTEMD_UNIT=" + escape(localStorage["filter"]);

                                if (localStorage["boot"] == "1")
                                        url += "&boot";
                        } else {
                                if (localStorage["boot"] == "1")
                                        url += "?boot";
                        }

                        var request = new XMLHttpRequest();
                        request.open("GET", url);
                        request.onreadystatechange = entriesOnResult;
                        request.setRequestHeader("Accept", "application/json");
                        request.setRequestHeader("Range", "entries=" + range + ":" + getNEntries().toString());
                        request.send(null);
                }

                function entriesLoadNext() {
                        if (last_cursor == null)
                                entriesLoad("");
                        else
                                entriesLoad(last_cursor + ":1");
                }

                function entriesLoadPrevious() {
                        if (first_cursor == null)
                                entriesLoad("");
                        else
                                entriesLoad(first_cursor + ":-" + getNEntries().toString());
                }

                function entriesLoadHead() {
                        entriesLoad("");
                }

                function entriesLoadTail() {
                        entriesLoad(":-" + getNEntries().toString());
                }

                function entriesOnResult(event) {

                        if ((event.currentTarget.readyState != 4) ||
                                (event.currentTarget.status != 200 && event.currentTarget.status != 0))
                                return;

                        var logs = document.getElementById("tablelogs");

                        var lc = null;
                        var fc = null;

                        var i, l = event.currentTarget.responseText.split('\n');

                        if (l.length <= 1) {
                                logs.innerHTML = '<tbody><tr><td colspan="3"><i>No further entries...</i></td></tr></tbody>';
                                return;
                        }

                        var buf = '';

                        for (i in l) {
                                if (l[i] == '')
                                        continue;

                                var d = JSON.parse(l[i]);
                                if (d.MESSAGE == undefined || d.__CURSOR == undefined)
                                        continue;

                                if (fc == null)
                                        fc = d.__CURSOR;
                                lc = d.__CURSOR;

                                var priority;
                                if (d.PRIORITY != undefined)
                                        priority = parseInt(d.PRIORITY);
                                else
                                        priority = 6;

                                var clazz;
                                if (priority <= 3)
                                        clazz = "message-error";
                                else if (priority <= 5)
                                        clazz = "message-highlight";
                                else
                                        clazz = "message";

                                buf += '<tr><td class="timestamp">';

                                if (d.__REALTIME_TIMESTAMP != undefined) {
                                        var timestamp = new Date(parseInt(d.__REALTIME_TIMESTAMP) / 1000);
                                        buf += timestamp.toLocaleString();
                                }

                                buf += '</td><td class="process">';

                                if (d.SYSLOG_IDENTIFIER != undefined)
                                        buf += escapeHTML(d.SYSLOG_IDENTIFIER);
                                else if (d._COMM != undefined)
                                        buf += escapeHTML(d._COMM);

                                if (d._PID != undefined)
                                        buf += "[" + escapeHTML(d._PID) + "]";
                                else if (d.SYSLOG_PID != undefined)
                                        buf += "[" + escapeHTML(d.SYSLOG_PID) + "]";

                                buf += '</td><td class="' + clazz + '"><a href="#entry" onclick="onMessageClick(\'' + d.__CURSOR + '\');">';

                                if (d.MESSAGE == null)
                                        buf += "[blob data]";
                                else if (d.MESSAGE instanceof Array)
                                        buf += "[" + formatBytes(d.MESSAGE.length) + " blob data]";
                                else
                                        buf += escapeHTML(d.MESSAGE);

                                buf += '</a></td></tr>';
                        }

                        logs.innerHTML = '<tbody>' + buf + '</tbody>';

                        if (fc != null) {
                                first_cursor = fc;
                                localStorage["cursor"] = fc;
                        }
                        if (lc != null)
                                last_cursor = lc;
                }

                function entriesMore() {
                        setNEntries(getNEntries() + 10);
                        entriesLoad(first_cursor);
                }

                function entriesLess() {
                        setNEntries(getNEntries() - 10);
                        entriesLoad(first_cursor);
                }

                function onResultMessageClick(event) {
                        if ((event.currentTarget.readyState != 4) ||
                                (event.currentTarget.status != 200 && event.currentTarget.status != 0))
                                return;

                        var d = JSON.parse(event.currentTarget.responseText);

                        document.getElementById("diventry").style.display = "block";
                        var entry = document.getElementById("tableentry");

                        var buf = "";
                        for (var key in d) {
                                var data = d[key];

                                if (data == null)
                                        data = "[blob data]";
                                else if (data instanceof Array)
                                        data = "[" + formatBytes(data.length) + " blob data]";
                                else
                                        data = escapeHTML(data);

                                buf += '<tr><td class="field">' + key + '</td><td class="data">' + data + '</td></tr>';
                        }
                        entry.innerHTML = '<tbody>' + buf + '</tbody>';
                }

                function onMessageClick(t) {
                        var request = new XMLHttpRequest();
                        request.open("GET", "entries?discrete");
                        request.onreadystatechange = onResultMessageClick;
                        request.setRequestHeader("Accept", "application/json");
                        request.setRequestHeader("Range", "entries=" + t + ":0:1");
                        request.send(null);
                }

                function onKeyUp(event) {
                        switch (event.keyCode) {
                                case 8:
                                case 37:
                                case 75:
                                        entriesLoadPrevious();
                                        break;
                                case 32:
                                case 39:
                                case 74:
                                        entriesLoadNext();
                                        break;

                                case 71:
                                        if (event.shiftKey)
                                                entriesLoadTail();
                                        else
                                                entriesLoadHead();
                                        break;
                                case 171:
                                        entriesMore();
                                        break;
                                case 173:
                                        entriesLess();
                                        break;
                        }
                }

                function onMouseWheel(event) {
                        if (event.detail < 0 || event.wheelDelta > 0)
                                entriesLoadPrevious();
                        else
                                entriesLoadNext();
                }

                function onResultFilterFocus(event) {
                        if ((event.currentTarget.readyState != 4) ||
                                (event.currentTarget.status != 200 && event.currentTarget.status != 0))
                                return;

                        var f = document.getElementById("filter");

                        var l = event.currentTarget.responseText.split('\n');
                        var buf = '<option>No filter</option>';
                        var j = -1;

                        for (i in l) {

                                if (l[i] == '')
                                      continue;

                                var d = JSON.parse(l[i]);
                                if (d._SYSTEMD_UNIT == undefined)
                                      continue;

                                buf += '<option value="' + escape(d._SYSTEMD_UNIT) + '">' + escapeHTML(d._SYSTEMD_UNIT) + '</option>';

                                if (d._SYSTEMD_UNIT == localStorage["filter"])
                                        j = i;
                        }

                        if (j < 0) {
                                if (localStorage["filter"] != null && localStorage["filter"] != "") {
                                          buf += '<option value="' + escape(localStorage["filter"]) + '">' + escapeHTML(localStorage["filter"]) + '</option>';
                                          j = i + 1;
                                } else
                                          j = 0;
                        }

                        f.innerHTML = buf;
                        f.selectedIndex = j;
                }

                function onFilterFocus(w) {
                        var request = new XMLHttpRequest();
                        request.open("GET", "fields/_SYSTEMD_UNIT");
                        request.onreadystatechange = onResultFilterFocus;
                        request.setRequestHeader("Accept", "application/json");
                        request.send(null);
                }

                function onFilterChange(w) {
                        if (w.selectedIndex <= 0)
                                localStorage["filter"] = "";
                        else
                                localStorage["filter"] = unescape(w.options[w.selectedIndex].value);

                        entriesLoadHead();
                }

                function onBootChange(w) {
                        localStorage["boot"] = w.checked ? "1" : "0";
                        entriesLoadHead();
                }

                function initFilter() {
                        var f = document.getElementById("filter");

                        var buf = '<option>No filter</option>';

                        var filter = localStorage["filter"];
                        var j;
                        if (filter != null && filter != "") {
                                buf += '<option value="' + escape(filter) + '">' + escapeHTML(filter) + '</option>';
                                j = 1;
                        } else
                                j = 0;

                        f.innerHTML = buf;
                        f.selectedIndex = j;
                }

                function installHandlers() {
                        document.onkeyup = onKeyUp;

                        var logs = document.getElementById("divlogs");
                        logs.addEventListener("mousewheel", onMouseWheel, false);
                        logs.addEventListener("DOMMouseScroll", onMouseWheel, false);
                }

                machineLoad();
                entriesLoad(null);
                showNEntries(getNEntries());
                initFilter();
                installHandlers();
        </script>
</body>
</html>