const $ = (sel) => document.querySelector(sel);

const STATUS = {
	ok: { text: '正常', cls: 'st-ok' },
	error: { text: '异常', cls: 'st-error' },
	conflict: { text: '冲突', cls: 'st-conflict' },
	running: { text: '同步中', cls: 'st-running' },
	idle: { text: '未启动', cls: 'st-idle' },
};
const RESULT_TEXT = { ok: '成功', error: '失败', conflict: '冲突' };

const STALE_HOURS = 24; // 超过该小时数且仍在运行 → 标记「久未同步」
function parseTs(s) {
	if (!s) return null;
	const t = new Date(String(s).replace(' ', 'T'));
	return isNaN(t.getTime()) ? null : t;
}
function relTime(s) {
	const t = parseTs(s);
	if (!t) return String(s || '');
	const min = Math.floor((Date.now() - t.getTime()) / 60000);
	if (min < 1) return '刚刚';
	if (min < 60) return min + ' 分钟前';
	const hr = Math.floor(min / 60);
	if (hr < 24) return hr + ' 小时前';
	const day = Math.floor(hr / 24);
	if (day < 30) return day + ' 天前';
	return String(s).slice(0, 10);
}
function isStale(s) {
	const t = parseTs(s);
	return !!t && (Date.now() - t.getTime()) > STALE_HOURS * 3600 * 1000;
}

let repos = [];
let current = null;
let creating = false;
let chart = null;

function esc(s) {
	return String(s ?? '').replace(/[&<>"']/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
}

async function api(url, opts) {
	const res = await fetch(url, opts);
	if (res.status === 401) {
		showLogin();
		throw new Error('需要登录');
	}
	const data = await res.json().catch(() => ({}));
	if (!res.ok) throw new Error(data.error || res.statusText);
	return data;
}
const post = (url) => api(url, { method: 'POST' });

function toast(msg, type) {
	const box = $('#toasts');
	if (!box) { console.warn('toast 容器缺失：', msg); return; }
	const el = document.createElement('div');
	el.className = 'toast t-' + (type || 'info');
	el.textContent = msg;
	el.title = '点击关闭';
	el.addEventListener('click', () => el.remove());
	box.appendChild(el);
	while (box.childElementCount > 5) box.removeChild(box.firstChild); // 最多堆叠 5 条
	const life = type === 'error' ? 6000 : 3200;
	setTimeout(() => {
		el.classList.add('out');
		setTimeout(() => el.remove(), 320);
	}, life);
}

const Editor = {
	cm: null,
	get el() { return $('#file-editor'); },
	get value() {
		if (this.cm) return this.cm.getValue();
		return this.el ? this.el.value : '';
	},
	set value(v) {
		const s = v == null ? '' : String(v);
		if (this.cm) this.cm.setValue(s);
		else if (this.el) this.el.value = s;
	},
	get disabled() {
		if (this.cm) return this.cm.getOption('readOnly') === 'nocursor';
		return !!(this.el && this.el.disabled);
	},
	set disabled(b) {
		if (this.cm) this.cm.setOption('readOnly', b ? 'nocursor' : false);
		if (this.el) this.el.disabled = !!b;
	},
	setMode(path) {
		if (!this.cm) return;
		const ext = String(path || '').split('.').pop().toLowerCase();
		const map = {
			js: 'javascript', mjs: 'javascript', cjs: 'javascript', jsx: 'javascript',
			json: 'application/json', ts: 'text/typescript', tsx: 'text/typescript',
			html: 'htmlmixed', htm: 'htmlmixed', vue: 'htmlmixed', xml: 'xml', svg: 'xml',
			css: 'css', scss: 'css', less: 'css',
			go: 'go', py: 'python', sh: 'shell', bash: 'shell', zsh: 'shell',
			c: 'clike', h: 'clike', cpp: 'clike', cc: 'clike', hpp: 'clike',
			java: 'clike', kt: 'clike', cs: 'clike', scala: 'clike',
			yml: 'yaml', yaml: 'yaml', sql: 'sql',
			md: 'markdown', markdown: 'markdown',
			ini: 'properties', properties: 'properties', env: 'properties',
			cfg: 'properties', conf: 'properties', toml: 'properties',
			diff: 'diff', patch: 'diff',
		};
		this.cm.setOption('mode', map[ext] || 'text/plain');
	},
	setTheme(dark) {
		if (this.cm) this.cm.setOption('theme', dark ? 'material-darker' : 'eclipse');
	},
	refresh() { if (this.cm) setTimeout(() => this.cm.refresh(), 30); },
	setChangedLines(lines) {
		this._changed = lines && lines.length ? lines : null;
		if (!this.cm) return;
		const n = this.cm.lineCount();
		for (let i = 0; i < n; i++) this.cm.removeLineClass(i, 'background', 'cm-chg');
		if (!this._changed) return;
		for (const ln of this._changed) {
			const idx = ln - 1;
			if (idx >= 0 && idx < n) this.cm.addLineClass(idx, 'background', 'cm-chg');
		}
	},
	onSave: null,    // 由 cm-boot.js 的快捷键触发
	onChange: null,  // 由 cm-boot.js 的 change 事件触发（草稿缓存）
};
window.Editor = Editor;

function render() {
	const grid = $('#grid');
	grid.innerHTML = '';
	repos.forEach(r => grid.appendChild(card(r)));
	$('#empty').hidden = repos.length > 0;
}

function card(r) {
	const st = STATUS[r.status] || STATUS.idle;
	const el = document.createElement('div');
	el.className = 'card ' + st.cls;
	el.dataset.name = r.name;
	const last = r.last_sync
		? `${relTime(r.last_sync.time)} · ${RESULT_TEXT[r.last_sync.result] || r.last_sync.result}`
		: '从未同步';
	el.innerHTML = `
		<div class="card-head">
			<span class="dot"></span>
			<h3>${esc(r.name)}</h3>
			<span class="mode">${esc(r.mode)}</span>
		</div>
		<div class="path" title="${esc(r.repo_path)}">${esc(r.repo_path)}</div>
		<div class="badges">
			<span class="badge">${esc(r.branch)}</span>
			<span class="badge ${r.ahead ? 'b-up' : ''}">领先 ↑${r.ahead}</span>
			<span class="badge ${r.behind ? 'b-down' : ''}">落后 ↓${r.behind}</span>
			${r.dirty ? `<span class="badge b-dirty">改动 ${r.dirty}</span>` : ''}
			${r.auto_commit ? '<span class="badge">自动提交</span>' : ''}
			${r.cron ? `<span class="badge" title="${esc(r.cron)}">cron</span>` : ''}
			${r.conflicts && r.conflicts.length ? `<span class="badge b-conflict">冲突 ${r.conflicts.length}</span>` : ''}
			${r.push_conflict ? `<span class="badge b-conflict">推送冲突</span>` : ''}
			${r.running && r.auto_sync === false ? `<span class="badge b-paused">手动模式</span>` : ''}
			${r.running && r.last_sync && isStale(r.last_sync.time) ? '<span class="badge b-stale">久未同步</span>' : ''}
		</div>
		<div class="last" title="${r.last_sync ? esc(r.last_sync.time) : ''}">上次同步：${esc(last)}</div>
		${r.last_sync && r.last_sync.detail ? `<div class="last-detail" title="${esc(r.last_sync.detail)}">${esc(r.last_sync.detail)}</div>` : ''}
		${r.status === 'error' && r.last_error ? `<div class="err" title="${esc(r.last_error)}">${esc(r.last_error)}</div>` : ''}
		<div class="card-btns">
			<button class="btn" data-act="sync" ${r.running ? '' : 'disabled'}>立即同步</button>
			<button class="btn" data-act="toggle">${r.running ? '暂停' : '启动'}</button>
			<button class="btn" data-act="detail">详情</button>
		</div>`;
	return el;
}

$('#grid').addEventListener('click', async (e) => {
	const btn = e.target.closest('button[data-act]');
	if (!btn) return;
	const name = btn.closest('.card').dataset.name;
	const act = btn.dataset.act;
	try {
		if (act === 'sync') {
			await post(`/api/repos/${name}/sync`);
		} else if (act === 'toggle') {
			const r = repos.find(x => x.name === name);
			await post(`/api/repos/${name}/${r.running ? 'stop' : 'start'}`);
		} else if (act === 'detail') {
			openDetail(name);
		}
	} catch (err) { toast(err.message, 'error'); }
});

function connect() {
	const es = new EventSource('/api/events');
	es.onopen = () => setConn(true);
	es.onerror = () => setConn(false); // EventSource 会自动重连
	es.onmessage = (ev) => {
		let msg;
		try { msg = JSON.parse(ev.data); } catch { return; }
		if (msg.type === 'snapshot') {
			repos = msg.data || [];
			render();
		} else if (msg.type === 'status') {
			const i = repos.findIndex(x => x.name === msg.repo);
			if (i >= 0) repos[i] = msg.data; else repos.push(msg.data);
			render();
			updateConflictActions();
			if (current === msg.repo && !$('#tab-diff').hidden) loadDiff(msg.repo);
		} else if (msg.type === 'log') {
			appendLiveLine(msg);
			if (current === msg.repo && !$('#tab-log').hidden) appendLogLine(`[${msg.time}] [${msg.level || 'info'}] ${msg.msg}`);
		}
	};
}

function setConn(ok) {
	const el = $('#conn');
	el.textContent = ok ? '● 已连接' : '● 未连接';
	el.className = 'conn ' + (ok ? 'on' : 'off');
	const live = $('#live-conn');
	if (live) {
		live.textContent = ok ? '● 已连接' : '● 未连接';
		live.className = 'conn ' + (ok ? 'on' : 'off');
	}
}

const LIVE_MAX = 400;
function appendLiveLine(msg) {
	const box = $('#live-log');
	if (!box) return;
	let level = 'info';
	if (msg.level === 'error') level = 'err';
	else if (msg.level === 'warn') level = 'warn';
	const line = document.createElement('div');
	line.className = 'live-line lv-' + level;
	line.innerHTML = `<span class="ll-time">${esc(msg.time)}</span><span class="ll-repo">${esc(msg.repo)}</span><span class="ll-msg">${esc(msg.msg)}</span>`;
	box.appendChild(line);
	while (box.childElementCount > LIVE_MAX) box.removeChild(box.firstChild);
	box.scrollTop = box.scrollHeight;
}

function clearLive() {
	const box = $('#live-log');
	if (box) box.innerHTML = '';
}

let liveSeeded = false;
async function seedLive() {
	if (liveSeeded) return;
	liveSeeded = true;
	const names = repos.map(r => r.name);
	await Promise.all(names.map(async (name) => {
		try {
			const d = await api(`/api/repos/${name}/log?lines=8`);
			if (d.lines && d.lines.length) {
				d.lines.forEach(t => {
					const m = t.match(/^\[(.+?)\]\s*(?:\[(info|warn|error)\]\s*)?(.*)$/i);
					appendLiveLine({
						time: m ? m[1] : '',
						repo: name,
						msg: m ? m[3] : t,
						level: m && m[2] ? m[2].toLowerCase() : 'info',
						seed: true,
					});
				});
			}
		} catch (_) { /* 忽略 */ }
	}));
}

$('#btn-live-clear').addEventListener('click', clearLive);

function showLogin() {
	const el = $('#login');
	if (el.hidden) {
		el.hidden = false;
		setTimeout(() => $('#login-password').focus(), 50);
	}
}

async function doLogin() {
	const errEl = $('#login-err');
	errEl.hidden = true;
	try {
		await fetch('/api/login', {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({ password: $('#login-password').value })
		}).then(async res => {
			if (!res.ok) {
				const d = await res.json().catch(() => ({}));
				throw new Error(d.error || '登录失败');
			}
		});
		location.reload();
	} catch (err) {
		errEl.textContent = err.message;
		errEl.hidden = false;
	}
}
$('#btn-login').addEventListener('click', doLogin);
$('#login-password').addEventListener('keydown', (e) => { if (e.key === 'Enter') doLogin(); });

function showTab(t) {
	document.querySelectorAll('#m-tabs .tab').forEach(b => b.classList.toggle('active', b.dataset.tab === t));
	document.querySelectorAll('.tab-pane').forEach(p => { p.hidden = p.id !== 'tab-' + t; });
	if (t === 'log' && current) loadLog(current);
	if (t === 'history' && current) loadHistory(current);
	if (t === 'diff' && current) loadDiff(current);
	if (t === 'file' && current) { loadTree(current); Editor.refresh(); }
	if (t === 'conflict' && current) { loadConflicts(current); updateConflictActions(); }
	if (t === 'stats' && current) loadStats(current);
}

$('#m-tabs').addEventListener('click', (e) => {
	const b = e.target.closest('.tab');
	if (b) showTab(b.dataset.tab);
});

function openDetail(name) {
	creating = false;
	current = name;
	const r = repos.find(x => x.name === name);
	$('#m-title').textContent = name;
	$('#f-name').disabled = true;
	$('#btn-delete').hidden = false;
	$('#btn-clone').hidden = false;
	fillForm(r);
	$('#summary-box').hidden = false;
	loadSummary(name);
	showTab('log');
	$('#modal').hidden = false;
}

function openCreate() {
	creating = true;
	current = null;
	$('#m-title').textContent = '新建配置';
	$('#f-name').disabled = false;
	$('#btn-delete').hidden = true;
	$('#btn-clone').hidden = true;
	fillForm(null);
	$('#summary-box').hidden = true;
	showTab('config');
	$('#modal').hidden = false;
}

async function loadSummary(name) {
	if (!name) return;
	try {
		const d = await api(`/api/repos/${name}/summary`);
		$('#f-summary').value = d.pending || '';
		$('#summary-log').textContent = d.log ? d.log.trim() : '（暂无本地变更摘要记录）';
	} catch (err) {
		$('#summary-log').textContent = '读取摘要失败：' + err.message;
	}
}

function closeModal() {
	$('#modal').hidden = true;
	current = null;
}

$('#m-close').addEventListener('click', closeModal);
$('#modal').addEventListener('click', (e) => { if (e.target === $('#modal')) closeModal(); });
document.addEventListener('keydown', (e) => { if (e.key === 'Escape') closeModal(); });

let logLines = [];
let logLevel = 'all';
let logQuery = '';

function logLevelOf(line) {
	const m = /^\[[^\]]+\]\s*\[(info|warn|error)\]/i.exec(line);
	return m ? m[1].toLowerCase() : 'info';
}
function renderLog() {
	const box = $('#logbox');
	const q = logQuery.trim().toLowerCase();
	const out = logLines.filter(l =>
		(logLevel === 'all' || logLevelOf(l) === logLevel) &&
		(!q || l.toLowerCase().includes(q))
	);
	if (!logLines.length) box.textContent = '（暂无日志）';
	else if (!out.length) box.textContent = '（当前过滤条件下无匹配行）';
	else box.textContent = out.join('\n');
	box.scrollTop = box.scrollHeight;
}
function loadLog(name) {
	$('#logbox').textContent = '加载中…';
	api(`/api/repos/${name}/log?lines=500`).then(d => {
		logLines = d.lines && d.lines.length ? d.lines : [];
		renderLog();
	}).catch(err => { logLines = []; $('#logbox').textContent = '日志加载失败：' + err.message; });
}

function appendLogLine(line) {
	logLines.push(line);
	if (logLines.length > 2000) logLines.shift();
	renderLog();
}

$('#log-level').addEventListener('change', (e) => { logLevel = e.target.value; renderLog(); });
$('#log-search').addEventListener('input', (e) => { logQuery = e.target.value; renderLog(); });
$('#btn-log-clear').addEventListener('click', () => {
	logLevel = 'all';
	logQuery = '';
	$('#log-level').value = 'all';
	$('#log-search').value = '';
	renderLog();
});

function loadHistory(name) {
	const list = $('#commit-list');
	list.textContent = '加载中…';
	api(`/api/repos/${name}/commits?limit=50`).then(commits => {
		if (!commits.length) {
			list.textContent = '暂无提交记录。';
			return;
		}
		list.innerHTML = commits.map(c => `
			<div class="commit" data-hash="${esc(c.hash)}">
				<div class="commit-head">
					<span class="commit-hash">${esc(c.hash.slice(0, 8))}</span>
					<span class="commit-subject" title="${esc(c.subject)}">${esc(c.subject)}</span>
					<span class="commit-meta">${esc(c.author)} · ${esc(c.date)}</span>
				</div>
				<pre class="commit-diff" hidden></pre>
			</div>`).join('');
	}).catch(err => { list.textContent = '提交历史加载失败：' + err.message; });
}

$('#commit-list').addEventListener('click', async (e) => {
	const head = e.target.closest('.commit-head');
	if (!head || !current) return;
	const item = head.closest('.commit');
	const pre = item.querySelector('.commit-diff');
	if (!pre.hidden) { pre.hidden = true; return; }
	pre.hidden = false;
	pre.textContent = '加载中…';
	try {
		const d = await api(`/api/repos/${current}/commits/${item.dataset.hash}`);
		pre.textContent = d.diff || '（无差异内容）';
	} catch (err) {
		pre.textContent = '加载失败：' + err.message;
	}
});

function loadConflicts(name) {
	api(`/api/repos/${name}/conflicts`).then(files => {
		const list = $('#conflict-list');
		if (!files.length) {
			list.innerHTML = '<p style="color:var(--muted)">当前没有冲突。</p>';
			return;
		}
		list.innerHTML = files.map(f => `
			<div class="conflict-file" data-path="${esc(f.file)}">
				<div class="cf-head">
					<h4 title="${esc(f.file)}">${esc(f.file)}</h4>
					<button class="btn btn-sm" data-cf="edit">编辑解决</button>
					<button class="btn btn-sm" data-cf="close" hidden>收起</button>
				</div>
				<div class="cf-edit" hidden>
					<textarea class="cf-ta" spellcheck="false" placeholder="加载中…"></textarea>
					<div class="cf-actions">
						<input class="file-msg cf-msg" placeholder="提交说明（可选）">
						<button class="btn btn-sm" data-cf="save">仅保存</button>
						<button class="btn btn-sm btn-primary" data-cf="resolve">保存并标记已解决</button>
					</div>
					<div class="cf-hint">「仅保存」只写回磁盘；「保存并标记已解决」会暂存该文件，并在已无其它冲突文件时结束合并/变基。</div>
				</div>
				<pre>${esc(f.diff) || '（无差异内容）'}</pre>
			</div>`).join('');
	}).catch(err => { $('#conflict-list').innerHTML = `<p style="color:var(--red)">${esc(err.message)}</p>`; });
}

$('#conflict-list').addEventListener('click', async (e) => {
	const btn = e.target.closest('button[data-cf]');
	if (!btn || !current) return;
	const item = btn.closest('.conflict-file');
	const path = item.dataset.path;
	const act = btn.dataset.cf;
	const wrap = item.querySelector('.cf-edit');
	const ta = item.querySelector('.cf-ta');
	const editBtn = item.querySelector('[data-cf="edit"]');
	const closeBtn = item.querySelector('[data-cf="close"]');

	if (act === 'edit') {
		wrap.hidden = false;
		editBtn.hidden = true;
		closeBtn.hidden = false;
		ta.disabled = false;
		ta.value = '加载中…';
		try {
			const d = await api(`/api/repos/${current}/file?path=${encodeURIComponent(path)}`);
			if (d.binary) {
				ta.value = `（二进制文件，大小 ${d.size} 字节，无法在网页编辑）`;
				ta.disabled = true;
			} else {
				ta.value = d.content || '';
			}
		} catch (err) {
			ta.value = '读取失败：' + err.message;
			ta.disabled = true;
		}
		return;
	}

	if (act === 'close') {
		wrap.hidden = true;
		editBtn.hidden = false;
		closeBtn.hidden = true;
		return;
	}

	if (ta.disabled) { toast('该文件当前不可编辑', 'error'); return; }
	try {
		await api(`/api/repos/${current}/resolve-file`, {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({
				path,
				content: ta.value,
				finish: act === 'resolve',
			})
		});
		toast(act === 'resolve' ? '已保存并结束合并/变基' : '已保存到磁盘（尚未标记解决）', 'success');
		loadConflicts(current);
		updateConflictActions();
		refresh();
	} catch (err) { toast(err.message, 'error'); }
});

async function doAction(action, okMsg) {
	try {
		await api(`/api/repos/${current}/action`, {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({ action })
		});
		toast(okMsg);
		loadConflicts(current);
	} catch (err) { toast(err.message, 'error'); }
}
$('#btn-abort').addEventListener('click', () => {
	if (confirm('确定放弃本次合并/变基？仓库将回到冲突前状态。')) doAction('abort', '已放弃本次合并');
});
$('#btn-resolved').addEventListener('click', () => doAction('resolve', '冲突处理流程完成'));

$('#btn-fetch').addEventListener('click', () => doAction('fetch', '获取完成'));
$('#btn-pull').addEventListener('click', () => doAction('pull', '拉取完成'));
$('#btn-push').addEventListener('click', () => doAction('push', '推送完成'));

$('#btn-force-push').addEventListener('click', async () => {
	if (!current) return;
	try {
		await post(`/api/repos/${current}/force-push`);
		toast('已发起强制推送（--force-with-lease）');
		updateConflictActions();
	} catch (err) { toast(err.message, 'error'); }
});
$('#btn-abort-push').addEventListener('click', async () => {
	if (!current) return;
	try {
		await post(`/api/repos/${current}/abort-push`);
		toast('已放弃强制推送');
		updateConflictActions();
	} catch (err) { toast(err.message, 'error'); }
});

function updateConflictActions() {
	const r = repos.find(x => x.name === current);
	const box = $('#push-conflict-actions');
	const hint = $('#push-conflict-hint');
	if (!box) return;
	if (r && r.push_conflict) {
		box.hidden = false;
		if (hint) hint.textContent = `远程 ${r.push_conflict_remote || ''} 分支 ${r.push_conflict_branch || ''} 有新提交，推送被拒绝`;
	} else {
		box.hidden = true;
	}
}

let diffPath = '';
let diffText = '';

function updateDiffFilterNote() {
	const el = $('#diff-filter');
	if (!el) return;
	if (!diffPath) { el.hidden = true; el.textContent = ''; return; }
	el.hidden = false;
	el.innerHTML = `仅显示：${esc(diffPath)} <a href="#" id="diff-filter-clear" style="color:inherit">✕ 显示全部</a>`;
	const a = $('#diff-filter-clear');
	if (a) a.addEventListener('click', (e) => {
		e.preventDefault();
		diffPath = '';
		updateDiffFilterNote();
		if (current) loadDiff(current);
	});
}

function loadDiff(name) {
	const scope = $('#f-diff-scope').value;
	const box = $('#diffbox');
	const stat = $('#diff-stat');
	box.textContent = '加载中…';
	stat.innerHTML = '';
	updateDiffFilterNote();
	let url = `/api/repos/${name}/diff?scope=${encodeURIComponent(scope)}`;
	if (diffPath) url += `&path=${encodeURIComponent(diffPath)}`;
	api(url).then(d => {
		diffText = d.text || '';
		renderDiff(box, diffText || '（无差异）');
		if (d.files && d.files.length) {
			stat.innerHTML = d.files.map(f =>
				`<span class="df ${f.add ? 'df-add' : ''} ${f.del ? 'df-del' : ''}">${esc(f.path)} <b style="color:var(--green)">+${f.add}</b> <b style="color:var(--red)">-${f.del}</b></span>`
			).join('');
		} else if (d.stat) {
			stat.textContent = d.stat.trim();
		}
	}).catch(err => { box.textContent = '差异加载失败：' + err.message; });
}

function parseUnifiedDiff(text) {
	const lines = String(text).split('\n');
	const files = [];
	let cur = null;
	let oldNo = 0, newNo = 0;
	let inHunk = false; // 词级模式（--word-diff=plain）下 git 的上下文行不带前导空格，需据此兜底
	const push = (header) => { cur = { header, rows: [] }; files.push(cur); return cur; };
	for (const line of lines) {
		if (line.startsWith('diff --git') || line.startsWith('Index: ')) { push(line); continue; }
		if (!cur && line === '') continue; // 开头空行忽略
		if (!cur) push('');
		if (line.startsWith('@@')) {
			const m = /@@ -(\d+)(?:,\d+)? \+(\d+)(?:,\d+)? @@/.exec(line);
			if (m) { oldNo = parseInt(m[1], 10); newNo = parseInt(m[2], 10); }
			inHunk = true;
			cur.rows.push({ type: 'hunk', text: line });
			continue;
		}
		if (line.startsWith('+++') || line.startsWith('---') || line.startsWith('index ') ||
			line.startsWith('new file') || line.startsWith('deleted file') || line.startsWith('similarity ') ||
			line.startsWith('rename ') || line.startsWith('old mode') || line.startsWith('new mode')) {
			cur.rows.push({ type: 'meta', text: line });
			continue;
		}
		if (line.startsWith('+')) { cur.rows.push({ type: 'add', text: line.slice(1), no: newNo++ }); continue; }
		if (line.startsWith('-')) { cur.rows.push({ type: 'del', text: line.slice(1), no: oldNo++ }); continue; }
		if (line.startsWith(' ')) { cur.rows.push({ type: 'ctx', text: line.slice(1), no: oldNo++, nNo: newNo++ }); continue; }
		if (line === '') { cur.rows.push({ type: 'ctx', text: '', no: oldNo++, nNo: newNo++ }); continue; }
		// 词级模式（--word-diff=plain）下 git 的上下文行不带前导空格，
		if (inHunk && !line.startsWith('\\')) {
			cur.rows.push({ type: 'ctx', text: line, no: oldNo++, nNo: newNo++ });
			continue;
		}
		cur.rows.push({ type: 'meta', text: line });
	}
	return files;
}

function fillWord(el, text) {
	const re = /\[-([\s\S]*?)-\]|\{\+([\s\S]*?)\+\}/g;
	let last = 0, m;
	el.textContent = '';
	while ((m = re.exec(text)) !== null) {
		if (m.index > last) el.appendChild(document.createTextNode(text.slice(last, m.index)));
		const span = document.createElement('span');
		const isDel = m[1] !== undefined;
		span.className = isDel ? 'wd-del' : 'wd-add';
		span.textContent = isDel ? m[1] : m[2];
		el.appendChild(span);
		last = re.lastIndex;
	}
	if (last < text.length) el.appendChild(document.createTextNode(text.slice(last)));
	if (!el.childNodes.length) el.appendChild(document.createTextNode(text));
}

function buildSplitRows(rows) {
	const out = [];
	let i = 0;
	while (i < rows.length) {
		const r = rows[i];
		if (r.type === 'hunk' || r.type === 'meta') { out.push({ kind: r.type, text: r.text }); i++; continue; }
		if (r.type === 'ctx') {
			out.push({ kind: 'ctx', left: r, right: { text: r.text, no: r.nNo == null ? r.no : r.nNo } });
			i++;
			continue;
		}
		const dels = [], adds = [];
		while (i < rows.length && rows[i].type === 'del') dels.push(rows[i++]);
		while (i < rows.length && rows[i].type === 'add') adds.push(rows[i++]);
		const n = Math.max(dels.length, adds.length);
		for (let k = 0; k < n; k++) {
			const l = dels[k] || null, a = adds[k] || null;
			out.push({ kind: l && a ? 'chg' : (l ? 'del' : 'add'), left: l, right: a });
		}
	}
	return out;
}

function fileHeaderOf(h) {
	const m = /^diff --git a\/(.+?) b\/(.+)$/.exec(h);
	return m ? m[2] : h;
}

function sideCell(cls, r, word) {
	const c = document.createElement('div');
	c.className = 'scol ' + cls;
	const ln = document.createElement('span');
	ln.className = 'ln';
	ln.textContent = r ? (r.no == null ? '' : r.no) : '';
	const t = document.createElement('span');
	t.className = 'stxt';
	if (r) { if (word) fillWord(t, r.text); else t.textContent = r.text; }
	c.appendChild(ln);
	c.appendChild(t);
	return c;
}

function buildSplit(f, word) {
	const frag = document.createDocumentFragment();
	buildSplitRows(f.rows).forEach(r => {
		if (r.kind === 'hunk' || r.kind === 'meta') {
			const d = document.createElement('div');
			d.className = 'diff-line diff-hunk';
			d.textContent = r.text === '' ? ' ' : r.text;
			frag.appendChild(d);
			return;
		}
		const row = document.createElement('div');
		row.className = 'srow s-' + r.kind;
		row.appendChild(sideCell('sl', r.left, word));
		row.appendChild(sideCell('sr', r.right, word));
		frag.appendChild(row);
	});
	return frag;
}

function buildUnified(f, word) {
	const frag = document.createDocumentFragment();
	f.rows.forEach(r => {
		const d = document.createElement('div');
		d.className = 'diff-line';
		if (r.type === 'add') d.classList.add('diff-add');
		else if (r.type === 'del') d.classList.add('diff-del');
		else if (r.type === 'hunk') d.classList.add('diff-hunk');
		const prefix = r.type === 'add' ? '+' : r.type === 'del' ? '-' : r.type === 'ctx' ? ' ' : '';
		const txt = prefix + r.text;
		if (word) fillWord(d, txt); else d.textContent = txt === '' ? ' ' : txt;
		frag.appendChild(d);
	});
	return frag;
}

function renderDiff(box, text) {
	box.innerHTML = '';
	const viewEl = $('#f-diff-view');
	const wordEl = $('#f-diff-word');
	const split = !!viewEl && viewEl.value === 'split';
	const word = !!wordEl && wordEl.checked;
	const files = parseUnifiedDiff(text);
	const frag = document.createDocumentFragment();
	if (!files.length) {
		const d = document.createElement('div');
		d.className = 'diff-line';
		d.textContent = String(text) || '（无差异）';
		frag.appendChild(d);
		box.appendChild(frag);
		return;
	}
	files.forEach(f => {
		if (f.header) {
			const h = document.createElement('div');
			h.className = 'diff-file-head';
			h.textContent = fileHeaderOf(f.header);
			h.title = f.header;
			frag.appendChild(h);
		}
		frag.appendChild(split ? buildSplit(f, word) : buildUnified(f, word));
	});
	box.appendChild(frag);
}

let fileCurrent = null;
const STATUS_LABEL = { M: '已修改', A: '已新增', D: '已删除', '?': '未跟踪' };
function loadTree(name) {
	const list = $('#file-list');
	list.textContent = '加载中…';
	api(`/api/repos/${name}/tree`).then(d => {
		const files = d.files || [];
		if (!files.length) { list.textContent = '（无文件）'; return; }
		list.innerHTML = files.map(f => {
			const st = f.status || '';
			const cls = st === '?' ? 'Q' : st;
			const badge = st
				? `<span class="fi-status s-${esc(cls)}" title="${esc(STATUS_LABEL[st] || st)}">${esc(st)}</span>`
				: '';
			return `<div class="file-item" data-path="${esc(f.path)}" title="${esc(f.path)}"><span class="fi-name">${esc(f.path)}</span>${badge}</div>`;
		}).join('');
	}).catch(err => { list.textContent = '文件列表加载失败：' + err.message; });
}

const draftKey = (name, path) => `gitautosync:draft:${name}:${path}`;
let draftServer = '';   // 当前文件在磁盘上的原文，用于「放弃草稿」回滚
let draftTimer = null;

function showDraftNote(on) {
	const el = $('#file-draft');
	if (!el) return;
	if (!on) { el.hidden = true; el.innerHTML = ''; return; }
	el.hidden = false;
	el.innerHTML = '已恢复未保存的草稿 <a href="#" id="draft-discard" style="color:inherit">放弃草稿</a>';
	const a = $('#draft-discard');
	if (a) a.addEventListener('click', (e) => {
		e.preventDefault();
		localStorage.removeItem(draftKey(current, fileCurrent));
		Editor.value = draftServer;
		showDraftNote(false);
	});
}

function scheduleDraft() {
	if (!current || !fileCurrent) return;
	if (draftTimer) clearTimeout(draftTimer);
	draftTimer = setTimeout(() => {
		if (Editor.disabled) return;
		const v = Editor.value;
		if (v === draftServer) localStorage.removeItem(draftKey(current, fileCurrent));
		else localStorage.setItem(draftKey(current, fileCurrent), v);
	}, 600);
}

async function loadFile(name, path) {
	Editor._suspend = true;
	try {
		Editor.value = '加载中…';
		Editor.disabled = false;
		Editor.setMode(path);
		$('#file-current').textContent = path;
		fileCurrent = path;
		showDraftNote(false);
		const d = await api(`/api/repos/${name}/file?path=${encodeURIComponent(path)}`);
		if (d.binary) {
			Editor.setChangedLines(null);
			const bh = $('#file-chg-hint'); if (bh) bh.hidden = true;
			Editor.value = `（二进制文件，大小 ${d.size} 字节，无法在网页编辑）`;
			Editor.disabled = true;
			draftServer = '';
			return;
		}
		draftServer = d.content || '';
		const saved = localStorage.getItem(draftKey(name, path));
		if (saved !== null && saved !== draftServer) {
			Editor.value = saved;
			showDraftNote(true);
		} else {
			Editor.value = draftServer;
		}
		Editor.setChangedLines(d.changed);
		const hint = $('#file-chg-hint');
		if (hint) hint.hidden = !(d.changed && d.changed.length);
		Editor.disabled = false;
	} catch (err) {
		Editor.setChangedLines(null);
		const eh = $('#file-chg-hint'); if (eh) eh.hidden = true;
		Editor.value = '读取失败：' + err.message;
		Editor.disabled = true;
	} finally {
		Editor._suspend = false;
	}
}

async function saveFile(commit) {
	const name = current;
	const path = fileCurrent;
	if (!name || !path) { toast('请先在左侧选择一个文件'); return; }
	if (Editor.disabled) { toast('当前文件不可编辑（二进制或读取失败）'); return; }
	const content = Editor.value;
	try {
		await api(`/api/repos/${name}/file`, {
			method: 'PUT',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({ path, content })
		});
		localStorage.removeItem(draftKey(name, path));
		showDraftNote(false);
		draftServer = content;
		if (commit) {
			await api(`/api/repos/${name}/commit`, {
				method: 'POST',
				headers: { 'Content-Type': 'application/json' },
				body: JSON.stringify({ path, message: $('#file-msg').value })
			});
			toast('已保存并提交');
		} else {
			$('#f-diff-scope').value = 'working';
			showTab('diff');
			toast('已保存到磁盘（未提交）。可在「差异」tab 查看改动，或稍后由自动同步提交。');
		}
	} catch (err) { toast('保存失败：' + err.message); }
}

$('#f-diff-scope').addEventListener('change', () => { if (current && !$('#tab-diff').hidden) loadDiff(current); });
$('#f-diff-view').addEventListener('change', () => { renderDiff($('#diffbox'), diffText || '（无差异）'); });
$('#f-diff-word').addEventListener('change', () => { if (current && !$('#tab-diff').hidden) loadDiff(current); });
$('#btn-diff-refresh').addEventListener('click', () => { if (current) loadDiff(current); });

$('#btn-diff-copy').addEventListener('click', async () => {
	if (!diffText) { toast('当前没有可复制的差异内容'); return; }
	try {
		await navigator.clipboard.writeText(diffText);
		toast('差异内容已复制到剪贴板');
	} catch (err) {
		toast('复制失败（浏览器可能限制了剪贴板权限）：' + err.message);
	}
});
$('#btn-diff-download').addEventListener('click', () => {
	if (!diffText) { toast('当前没有可下载的差异内容'); return; }
	const scope = $('#f-diff-scope').value;
	const blob = new Blob([diffText], { type: 'text/plain;charset=utf-8' });
	const a = document.createElement('a');
	a.href = URL.createObjectURL(blob);
	a.download = `${current || 'repo'}-${scope}.patch`;
	document.body.appendChild(a);
	a.click();
	document.body.removeChild(a);
	URL.revokeObjectURL(a.href);
});

$('#btn-file-refresh').addEventListener('click', () => { if (current) loadTree(current); });

$('#btn-file-diff').addEventListener('click', () => {
	if (!current || !fileCurrent) { toast('请先在左侧选择一个文件'); return; }
	diffPath = fileCurrent;
	$('#f-diff-scope').value = 'working';
	showTab('diff');
});

$('#file-list').addEventListener('click', (e) => {
	const item = e.target.closest('.file-item');
	if (!item || !current) return;
	loadFile(current, item.dataset.path);
});
$('#btn-file-save').addEventListener('click', () => saveFile(false));
$('#btn-file-commit').addEventListener('click', () => saveFile(true));

$('#file-editor').addEventListener('input', scheduleDraft);
$('#file-editor').addEventListener('keydown', (e) => {
	if ((e.ctrlKey || e.metaKey) && (e.key === 's' || e.key === 'S')) {
		e.preventDefault();
		saveFile(false);
	}
});
Editor.onChange = scheduleDraft;
Editor.onSave = () => saveFile(false);

function dateStr(d) {
	return d.getFullYear() + '-' + String(d.getMonth() + 1).padStart(2, '0') + '-' + String(d.getDate()).padStart(2, '0');
}

function loadStats(name) {
	api(`/api/repos/${name}/stats`).then(rows => {
		rows = rows.filter(r => r.action !== 'sync');
		const days = [];
		for (let i = 29; i >= 0; i--) {
			const d = new Date();
			d.setDate(d.getDate() - i);
			days.push(dateStr(d));
		}
		const normResult = r => r.result === 'success' ? 'ok' : r.result === 'failed' ? 'error' : r.result;
		const mk = (key) => days.map(d => rows.filter(r => normResult(r) === key && r.time.slice(0, 10) === d).length);
		const total = { ok: 0, error: 0, conflict: 0 };
		rows.forEach(r => { const k = normResult(r); if (total[k] !== undefined) total[k]++; });
		$('#stat-summary').innerHTML =
			`<span>近 30 天共 <b>${rows.length}</b> 次同步记录</span>` +
			`<span style="color:var(--green)">成功 <b>${total.ok}</b></span>` +
			`<span style="color:var(--red)">失败 <b>${total.error}</b></span>` +
			`<span style="color:var(--amber)">冲突 <b>${total.conflict}</b></span>`;
		if (chart) { chart.destroy(); chart = null; }
		if (!window.Chart) return;
		chart = new Chart($('#stat-chart'), {
			type: 'bar',
			data: {
				labels: days.map(d => d.slice(5)),
				datasets: [
					{ label: '成功', data: mk('ok'), backgroundColor: '#97c459' },
					{ label: '失败', data: mk('error'), backgroundColor: '#f09595' },
					{ label: '冲突', data: mk('conflict'), backgroundColor: '#ef9f27' },
				]
			},
			options: {
				responsive: true,
				scales: {
					x: { stacked: true },
					y: { stacked: true, ticks: { precision: 0 } }
				},
				plugins: { legend: { position: 'bottom' } }
			}
		});
	}).catch(err => { $('#stat-summary').textContent = '统计加载失败：' + err.message; });
}

function fillForm(r) {
	$('#f-name').value = r ? r.name : '';
	$('#f-path').value = r ? r.repo_path : '';
	$('#f-branch').value = r ? r.branch : 'main';
	$('#f-mode').value = r ? r.mode : 'both';
	$('#f-remotes').value = r && r.remotes ? r.remotes.map(x => x.name + '=' + x.url).join('\n') : '';
	$('#f-interval').value = r ? r.interval : 60;
	$('#f-auth').value = r ? r.auth_method : 'ssh';
	$('#f-conflict').value = r ? r.conflict_strategy : 'merge';
	$('#f-push').value = r ? r.push_strategy : 'manual';
	$('#f-retry').value = r ? r.retry_count : 3;
	$('#f-retry-interval').value = r ? r.retry_interval : 5;
	$('#f-autocommit').checked = r ? !!r.auto_commit : false;
	$('#f-autosync').checked = r ? (r.auto_sync !== false) : true;
	$('#f-cron').value = r ? (r.cron || '') : '';
	$('#f-log').value = r ? (r.log_file || '') : '';
	previewCron();
}

function readForm() {
	const remotes = [];
	$('#f-remotes').value.split('\n').forEach(line => {
		line = line.trim();
		if (!line) return;
		const i = line.indexOf('=');
		if (i > 0) remotes.push({ name: line.slice(0, i).trim(), url: line.slice(i + 1).trim() });
	});
	return {
		name: $('#f-name').value.trim(),
		repo_path: $('#f-path').value.trim(),
		branch: $('#f-branch').value.trim() || 'main',
		remotes,
		mode: $('#f-mode').value,
		interval: parseInt($('#f-interval').value, 10) || 60,
		auth_method: $('#f-auth').value,
		retry_count: parseInt($('#f-retry').value, 10) || 0,
		retry_interval: parseInt($('#f-retry-interval').value, 10) || 0,
		conflict_strategy: $('#f-conflict').value,
		push_strategy: $('#f-push').value,
		auto_commit: $('#f-autocommit').checked,
		auto_sync: $('#f-autosync').checked,
		cron: $('#f-cron').value.trim(),
		log_file: $('#f-log').value.trim(),
	};
}

$('#cfg-form').addEventListener('submit', async (e) => {
	e.preventDefault();
	const cfg = readForm();
	try {
		if (creating) {
			await api('/api/repos', {
				method: 'POST',
				headers: { 'Content-Type': 'application/json' },
				body: JSON.stringify(cfg)
			});
		} else {
			await api(`/api/repos/${cfg.name}`, {
				method: 'PUT',
				headers: { 'Content-Type': 'application/json' },
				body: JSON.stringify(cfg)
			});
		}
		closeModal();
		refresh();
	} catch (err) { toast('保存失败：' + err.message); }
});

$('#btn-delete').addEventListener('click', async () => {
	if (!current) return;
	if (!confirm(`确定删除配置 "${current}" ？（不影响日志和统计文件）`)) return;
	try {
		await api(`/api/repos/${current}`, { method: 'DELETE' });
		closeModal();
		refresh();
	} catch (err) { toast(err.message, 'error'); }
});

$('#btn-clone').addEventListener('click', () => {
	if (!current) return;
	const base = readForm();
	const oldName = base.name || 'repo';
	creating = true;
	current = null;
	const stem = oldName.replace(/-copy\d*$/i, '');
	let name = stem + '-copy';
	const taken = new Set(repos.map(r => r.name));
	let i = 2;
	while (taken.has(name)) name = stem + '-copy' + (i++);
	$('#m-title').textContent = `克隆配置：${oldName}`;
	$('#f-name').disabled = false;
	$('#btn-delete').hidden = true;
	$('#btn-clone').hidden = true;
	fillForm(base);
	$('#f-name').value = name;
	$('#f-path').value = '';   // 路径必须换，否则会与源仓库指向同一目录
	showTab('config');
	toast('已载入原配置内容：请修改「配置名称」与「仓库路径」后保存（仓库路径已清空，需指向新目录）', 'info');
	$('#f-name').focus();
});

$('#btn-summary-save').addEventListener('click', async () => {
	if (!current) return;
	try {
		const res = await api(`/api/repos/${current}/summary`, {
			method: 'POST',
			headers: { 'Content-Type': 'application/json' },
			body: JSON.stringify({ summary: $('#f-summary').value })
		});
		toast(res.ok ? '摘要已保存（本地，下次自动提交将使用此信息）' : '摘要保存失败', res.ok ? 'info' : 'error');
		await loadSummary(current);
	} catch (err) { toast('摘要保存失败：' + err.message, 'error'); }
});

$('#btn-new').addEventListener('click', openCreate);
$('#btn-empty-new').addEventListener('click', openCreate);
$('#btn-sync-all').addEventListener('click', () => {
	repos.filter(r => r.running).forEach(r => post(`/api/repos/${r.name}/sync`).catch(() => {}));
	toast(`已向 ${repos.filter(r => r.running).length} 个运行中的仓库发起同步`);
});

async function batchToggle(act) {
	const isStart = act === 'start';
	const targets = repos.filter(r => isStart ? !r.running : r.running);
	if (!targets.length) {
		toast(isStart ? '没有处于暂停状态的仓库' : '没有正在运行的仓库');
		return;
	}
	let ok = 0, fail = 0;
	await Promise.all(targets.map(async (r) => {
		try { await post(`/api/repos/${r.name}/${act}`); ok++; }
		catch (_) { fail++; }
	}));
	toast(`${isStart ? '启动' : '暂停'}完成：成功 ${ok}${fail ? `，失败 ${fail}` : ''}`, fail ? 'warn' : 'success');
	refresh();
}
$('#btn-start-all').addEventListener('click', () => batchToggle('start'));
$('#btn-stop-all').addEventListener('click', () => batchToggle('stop'));

const THEME_KEY = 'gitautosync:theme';
function applyTheme(dark) {
	document.documentElement.classList.toggle('dark', !!dark);
	const btn = $('#btn-theme');
	if (btn) btn.textContent = dark ? '☀️' : '🌙';
	Editor.setTheme(!!dark); // CodeMirror 主题跟随（未启用 CM 时为空操作）
}
function initTheme() {
	applyTheme(localStorage.getItem(THEME_KEY) === 'dark');
}
$('#btn-theme').addEventListener('click', () => {
	const dark = !document.documentElement.classList.contains('dark');
	localStorage.setItem(THEME_KEY, dark ? 'dark' : 'light');
	applyTheme(dark);
});

let cronTimer = null;
async function previewCron() {
	const el = $('#cron-next');
	if (!el) return;
	const expr = $('#f-cron').value.trim();
	if (!expr) { el.textContent = ''; el.className = 'cron-next'; return; }
	try {
		const d = await api(`/api/cron-next?expr=${encodeURIComponent(expr)}`);
		el.textContent = '下次执行：' + d.next;
		el.className = 'cron-next good';
	} catch (err) {
		el.textContent = '表达式无效：' + err.message;
		el.className = 'cron-next bad';
	}
}
$('#f-cron').addEventListener('input', () => {
	if (cronTimer) clearTimeout(cronTimer);
	cronTimer = setTimeout(previewCron, 400);
});

async function refresh() {
	try {
		const d = await api('/api/status');
		repos = d.repos || [];
		render();
		seedLive();
	} catch (e) { /* 忽略，SSE 会重试 */ }
}

initTheme();
refresh();
connect();
setInterval(refresh, 20000);