/* ip.js —— IP 地址处理
 * 提取输入文本中全部 IPv4 → 按 /24 段聚合输出（文本 / 高亮预览）：
 *   IP段      发现数量(段内去重IP数)  IP段性质  出现次数
 *   1.2.3.0/24  8                    公网      56
 *   1.2.3.4    出现次数
 *
 * 段按出现次数（段内全部 IP 原文出现次数之和）从高到低排列；
 * 「重点匹配 IP」：填写的 IP 命中后，其所在 /24 段优先置顶、对应 IP 红色标出。
 * CDN 段库由服务端通过 #ipCdnRaw 隐藏文本框注入，可在后台维护。
 */
(function () {
    'use strict';

    function $(id) { return document.getElementById(id); }

    // 内网 / 保留地址段（IPv4）
    var PRIV_RANGES = [
        ['0.0.0.0', 8], ['10.0.0.0', 8], ['100.64.0.0', 10], ['127.0.0.0', 8],
        ['169.254.0.0', 16], ['172.16.0.0', 12], ['192.168.0.0', 16],
        ['192.0.2.0', 24], ['198.51.100.0', 24], ['203.0.113.0', 24],
        ['224.0.0.0', 4], ['240.0.0.0', 4]
    ].map(function (r) {
        return { net: ipToInt(r[0]), prefix: r[1] };
    });

    function ipToInt(ip) {
        var p = String(ip).split('.');
        return (((+p[0]) << 24) + ((+p[1]) << 16) + ((+p[2]) << 8) + (+p[3])) >>> 0;
    }
    function inRange(ipInt, net, prefix) {
        var mask = (prefix === 0) ? 0 : ((0xFFFFFFFF << (32 - prefix)) >>> 0);
        return ((ipInt & mask) >>> 0) === ((net & mask) >>> 0);
    }
    function isPrivate(ipInt) {
        for (var i = 0; i < PRIV_RANGES.length; i++) {
            if (inRange(ipInt, PRIV_RANGES[i].net, PRIV_RANGES[i].prefix)) return true;
        }
        return false;
    }

    /* ---------- CDN 段库解析 ---------- */
    function parseCdnText(text) {
        var out = [], lines = String(text || '').split(/\r?\n/), i, m, p;
        for (i = 0; i < lines.length; i++) {
            var line = lines[i].trim();
            if (!line || line.charAt(0) === '#') continue;
            p = line.split(/\s+/);
            m = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\/(\d{1,2})$/.exec(p[0]);
            if (!m) continue;
            var a = +m[1], b = +m[2], c = +m[3], d = +m[4], pre = +m[5];
            if (a > 255 || b > 255 || c > 255 || d > 255 || pre > 32) continue;
            out.push({
                net: (((a << 24) + (b << 16) + (c << 8) + d) >>> 0),
                prefix: pre,
                label: p.slice(1).join(' ') || 'CDN'
            });
        }
        return out;
    }
    function cdnOf(ipInt, ranges) {
        for (var i = 0; i < ranges.length; i++) {
            if (inRange(ipInt, ranges[i].net, ranges[i].prefix)) return ranges[i].label;
        }
        return null;
    }

    /* ---------- IPv4 提取 ---------- */
    function extractIps(text) {
        var re = /(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/g, m, found = [];
        while ((m = re.exec(text)) !== null) {
            var a = +m[1], b = +m[2], c = +m[3], d = +m[4];
            if (a > 255 || b > 255 || c > 255 || d > 255) continue;
            found.push(a + '.' + b + '.' + c + '.' + d);
        }
        return found;
    }

    /* ---------- 重点 IP 解析 ---------- */
    function parseFocus(text) {
        var set = {};
        var parts = String(text || '').split(/[\s,，;；]+/);
        for (var i = 0; i < parts.length; i++) {
            var p = parts[i].trim();
            if (!p) continue;
            var m = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/.exec(p);
            if (!m) continue;
            if (+m[1] > 255 || +m[2] > 255 || +m[3] > 255 || +m[4] > 255) continue;
            set[m[1] + '.' + m[2] + '.' + m[3] + '.' + m[4]] = true;
        }
        return set;
    }

    function ipLess(a, b) {
        var aa = a.split('.').map(Number), bb = b.split('.').map(Number), k;
        for (k = 0; k < 4; k++) {
            if (aa[k] !== bb[k]) return aa[k] - bb[k];
        }
        return 0;
    }
    function keyLess(a, b) {
        var aa = a.split('.').map(Number), bb = b.split('.').map(Number), k;
        for (k = 0; k < 3; k++) {
            if (aa[k] !== bb[k]) return aa[k] - bb[k];
        }
        return 0;
    }

    var TYPE_ZH = { priv: '内网', cdn: 'CDN', pub: '公网' };

    /* 返回 { segs:[{line, hit, count, ips:[...], details:[ip]}], totalCount, totalIps, totalSeg, hitSeg, hitIps, rangeCount, counts } */
    function analyze(text, cdnRaw, focusSet) {
        var all = extractIps(text);
        if (!all.length) return null;
        var ranges = parseCdnText(cdnRaw);
        var counts = {};
        for (var ci = 0; ci < all.length; ci++) {
            counts[all[ci]] = (counts[all[ci]] || 0) + 1;
        }

        var segMap = {}, segOrder = [];
        for (var i = 0; i < all.length; i++) {
            var ip = all[i];
            var key = ip.substring(0, ip.lastIndexOf('.'));
            if (!segMap[key]) {
                segMap[key] = { key: key, ips: [], classes: {} };
                segOrder.push(key);
            }
            var seg = segMap[key];
            if (seg.ips.indexOf(ip) === -1) {
                seg.ips.push(ip);
                var int = ipToInt(ip);
                var vendor = cdnOf(int, ranges);
                var cls = vendor ? 'cdn' : (isPrivate(int) ? 'priv' : 'pub');
                seg.classes[cls] = (seg.classes[cls] || 0) + 1;
            }
        }
        segOrder.sort(keyLess);

        function segLabel(s) {
            var keys = Object.keys(s.classes);
            if (keys.length === 1) return TYPE_ZH[keys[0]];
            var best = keys.slice().sort(function (x, y) {
                return (s.classes[y] - s.classes[x]) || (TYPE_ZH[x] < TYPE_ZH[y] ? -1 : 1);
            })[0];
            return TYPE_ZH[best] + '为主(混合)';
        }

        var segs = segOrder.map(function (k) { return segMap[k]; });
        segs.forEach(function (s) {
            s.label = segLabel(s);
            // 段访问次数 = 段内全部具体 IP 在原文出现次数之和
            s.count = 0;
            s.ips.forEach(function (ip) { s.count += counts[ip] || 0; });
        });
        // 命中重点 IP 的段置顶；其余段按出现次数降序（同次数按段号升序）
        segs.forEach(function (s) {
            s.hit = s.ips.some(function (ip) { return focusSet[ip]; });
        });
        segs.sort(function (a, b) {
            if (a.hit !== b.hit) return a.hit ? -1 : 1;
            if (a.count !== b.count) return b.count - a.count;
            return keyLess(a.key, b.key);
        });

        var totalIps = 0, hitIps = 0, hitSeg = 0, totalCount = 0;
        segs.forEach(function (s) {
            totalIps += s.ips.length;
            totalCount += s.count;
            if (s.hit) hitSeg++;
            s.ips.sort(ipLess);
            var h = [], o = [];
            s.ips.forEach(function (ip) {
                if (focusSet[ip]) { h.push(ip); hitIps++; }
                else o.push(ip);
            });
            s.details = h.concat(o);
            s.line = s.key + '.0/24\t' + s.ips.length + '\t' + s.label + '\t' + s.count;
        });

        var cntSeg = { priv: 0, cdn: 0, pub: 0 };
        segs.forEach(function (s) {
            var lab = s.label;
            if (lab.indexOf('内网') === 0) cntSeg.priv++;
            else if (lab.indexOf('CDN') === 0) cntSeg.cdn++;
            else cntSeg.pub++;
        });

        return {
            segs: segs,
            totalCount: totalCount,
            totalIps: totalIps,
            totalSeg: segs.length,
            hitSeg: hitSeg,
            hitIps: hitIps,
            cntSeg: cntSeg,
            rangeCount: ranges.length,
            counts: counts
        };
    }

    /* ---------- 文本 / 高亮输出 ---------- */
    function esc(s) {
        return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
    }
    function plainText(data) {
        var lines = ['IP段	发现数量	IP段性质	出现次数'];
        data.segs.forEach(function (s) {
            lines.push(s.line);
            s.details.forEach(function (ip) { lines.push(ip + '  ' + (data.counts[ip] || 1)); });
            lines.push('');
        });
        return lines.join('\n');
    }
    function previewHtml(data) {
        var parts = [];
        parts.push(esc('IP段	发现数量	IP段性质	出现次数').replace(/\t/g, '    '));
        data.segs.forEach(function (s) {
            var lineTxt = s.line.replace(/\t/g, '    ');
            parts.push(s.hit ? '<span class="ip-seg-hit">★ ' + esc(lineTxt) + '</span>' : esc(lineTxt));
            s.details.forEach(function (ip) {
                var cnt = data.counts[ip] || 1;
                var row = esc(ip) + '  ' + cnt;
                parts.push(focusCur[ip] ? '<span class="ip-hit">' + row + '</span>' : row);
            });
            parts.push('');
        });
        return parts.join('\n');
    }
    var focusCur = {};

    /* ---------- 事件 ---------- */
    var lastData = null;
    function run() {
        var input = $('ipInput');
        var msg = $('ipMsg');
        msg.innerHTML = '';
        var text = input.value;
        if (!text.trim()) {
            msg.innerHTML = '<div class="err-msg">请先粘贴要分析的日志 / 文本内容。</div>';
            return;
        }
        var cdnRaw = ($('ipCdnRaw') && $('ipCdnRaw').value) || '';
        var fs = parseFocus($('ipFocus').value);
        focusCur = fs;
        lastData = analyze(text, cdnRaw, fs);
        if (!lastData) {
            $('ipResult').hidden = true;
            msg.innerHTML = '<div class="err-msg">未在输入内容中解析到有效的 IPv4 地址。</div>';
            return;
        }
        var d = lastData;
        $('ipPreview').innerHTML = previewHtml(d);
        var st = d.cntSeg;
        var note = 'IP 共出现 ' + d.totalCount + ' 次，去重 IP ' + d.totalIps + ' 个，涉及 ' + d.totalSeg + ' 个 /24 段（内网 ' +
            st.priv + ' 段 / CDN ' + st.cdn + ' 段 / 公网 ' + st.pub + ' 段），按段出现次数降序排列。';
        if (Object.keys(parseFocus($('ipFocus').value)).length === 0) {
            note += ' 未填写重点 IP。';
        } else if (d.hitIps === 0) {
            note += ' 填写的重点 IP 均未在输入内容中命中。';
        } else {
            note += ' 命中重点 IP ' + d.hitIps + ' 个，' + d.hitSeg + ' 个 /24 段已优先置顶。';
        }
        if (d.rangeCount === 0) note += ' CDN 段库为空，可在后台补充。';
        $('ipStat').textContent = note;
        $('ipResult').hidden = false;
        msg.innerHTML = '';
    }
    function copyText(text) {
        function done(ok) {
            var btn = $('ipCopy');
            var old = btn.textContent;
            btn.textContent = ok ? '✓ 已复制' : '复制失败';
            setTimeout(function () { btn.textContent = old; }, 1200);
        }
        if (navigator.clipboard && navigator.clipboard.writeText) {
            navigator.clipboard.writeText(text).then(function () { done(true); }, function () { fallback(text, done); });
        } else {
            fallback(text, done);
        }
    }
    function fallback(text, done) {
        var ta = document.createElement('textarea');
        ta.value = text;
        ta.style.cssText = 'position:fixed;opacity:0;';
        document.body.appendChild(ta);
        ta.select();
        try { done(document.execCommand('copy')); } catch (e) { done(false); }
        document.body.removeChild(ta);
    }
    function clearAll() {
        $('ipInput').value = '';
        $('ipFile').value = '';
        $('ipFocus').value = '';
        $('ipMsg').innerHTML = '';
        $('ipResult').hidden = true;
        $('ipInput').focus();
    }

    /* ---------- 上传文本文件识别 ---------- */
    var FILE_MAX = 20 * 1024 * 1024;                 // ≤ 20MB
    var FILE_EXTS = ['.txt', '.json', '.log', '.md', '.csv', '.conf', '.ini'];
    var fileInput = $('ipFile');
    if (fileInput) {
        fileInput.addEventListener('change', function () {
            var f = fileInput.files && fileInput.files[0];
            var msg = $('ipMsg');
            msg.innerHTML = '';
            if (!f) return;
            var name = (f.name || '').toLowerCase();
            var okExt = false;
            for (var ei = 0; ei < FILE_EXTS.length; ei++) {
                if (name.slice(-FILE_EXTS[ei].length) === FILE_EXTS[ei]) { okExt = true; break; }
            }
            if (!okExt) {
                msg.innerHTML = '<div class="err-msg">不支持的文件格式。请上传 txt / json / log / md / csv / conf / ini 文本文件。</div>';
                fileInput.value = '';
                return;
            }
            if (f.size > FILE_MAX) {
                msg.innerHTML = '<div class="err-msg">文件超过 20MB 限制，请拆分后再分析。</div>';
                fileInput.value = '';
                return;
            }
            var rd = new FileReader();
            rd.onload = function () {
                $('ipInput').value = String(rd.result || '');
                msg.innerHTML = '<div class="ok-msg">已读取「' + esc(f.name) + '」（' + (f.size / 1024).toFixed(1) + ' KB），正在分析…</div>';
                run();
            };
            rd.onerror = function () {
                msg.innerHTML = '<div class="err-msg">文件读取失败，请重试或改用文本粘贴。</div>';
            };
            rd.readAsText(f, 'UTF-8');
        });
    }

    /* ---------- 导出 TXT ---------- */
    function stamp() {
        var d = new Date(), p = function (n) { return (n < 10 ? '0' : '') + n; };
        return '' + d.getFullYear() + p(d.getMonth() + 1) + p(d.getDate()) + '_' + p(d.getHours()) + p(d.getMinutes()) + p(d.getSeconds());
    }
    function exportTxt() {
        if (!lastData) return;
        var text = plainText(lastData);
        var blob = new Blob(['\ufeff' + text], { type: 'text/plain;charset=utf-8' });   // BOM 便于记事本识别 UTF-8
        var url = URL.createObjectURL(blob);
        var a = document.createElement('a');
        a.href = url;
        a.download = 'ip_result_' + stamp() + '.txt';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        setTimeout(function () { URL.revokeObjectURL(url); }, 1500);
    }

    $('ipBtn').addEventListener('click', run);
    $('ipCopy').addEventListener('click', function () {
        if (lastData) copyText(plainText(lastData));
    });
    $('ipExport').addEventListener('click', exportTxt);
    $('ipClear').addEventListener('click', clearAll);
    $('ipInput').addEventListener('keydown', function (ev) {
        if (ev.key === 'Enter' && (ev.ctrlKey || ev.metaKey)) run();
    });
})();