feat: 初始化项目

server/db.js

@@ -0,0 +1,159 @@
+/**
+ * SQLite：统计、留言、后端配置（弹幕开关与位置）
+ */
+const Database = require('better-sqlite3');
+const path = require('path');
+
+const DB_PATH = path.join(__dirname, 'data', 'pano.db');
+
+function getDb() {
+  const db = new Database(DB_PATH);
+  db.pragma('journal_mode = WAL');
+  return db;
+}
+
+function initDb() {
+  const fs = require('fs');
+  const dir = path.join(__dirname, 'data');
+  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+  const db = getDb();
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS stats (
+      id INTEGER PRIMARY KEY CHECK (id = 1),
+      view_count INTEGER NOT NULL DEFAULT 0,
+      like_count INTEGER NOT NULL DEFAULT 0,
+      share_count INTEGER NOT NULL DEFAULT 0,
+      watching_now INTEGER NOT NULL DEFAULT 0
+    );
+    INSERT OR IGNORE INTO stats (id, view_count, like_count, share_count, watching_now) VALUES (1, 0, 0, 0, 0);
+
+    CREATE TABLE IF NOT EXISTS viewers (
+      viewer_id TEXT PRIMARY KEY,
+      updated_at INTEGER NOT NULL
+    );
+
+    CREATE TABLE IF NOT EXISTS comments (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      content TEXT NOT NULL,
+      nickname TEXT,
+      created_at INTEGER NOT NULL
+    );
+
+    CREATE TABLE IF NOT EXISTS settings (
+      key TEXT PRIMARY KEY,
+      value TEXT NOT NULL
+    );
+    INSERT OR IGNORE INTO settings (key, value) VALUES ('danmaku_enabled', '0');
+    INSERT OR IGNORE INTO settings (key, value) VALUES ('danmaku_position', 'top');
+  `);
+  db.close();
+}
+
+function getConfig() {
+  const db = getDb();
+  const rows = db.prepare('SELECT key, value FROM settings').all();
+  db.close();
+  const map = {};
+  rows.forEach((r) => { map[r.key] = r.value; });
+  return {
+    danmakuEnabled: map.danmaku_enabled === '1',
+    danmakuPosition: (map.danmaku_position || 'top').toLowerCase(),
+  };
+}
+
+function getStats() {
+  const db = getDb();
+  const row = db.prepare('SELECT view_count, like_count, share_count, watching_now FROM stats WHERE id = 1').get();
+  const commentRow = db.prepare('SELECT COUNT(*) as n FROM comments').get();
+  db.close();
+  return {
+    viewCount: row.view_count,
+    commentCount: commentRow.n,
+    likeCount: row.like_count,
+    shareCount: row.share_count,
+    watchingNow: row.watching_now,
+  };
+}
+
+function incView() {
+  const db = getDb();
+  db.prepare('UPDATE stats SET view_count = view_count + 1 WHERE id = 1').run();
+  const out = getStats();
+  db.close();
+  return out;
+}
+
+function incLike() {
+  const db = getDb();
+  db.prepare('UPDATE stats SET like_count = like_count + 1 WHERE id = 1').run();
+  const row = db.prepare('SELECT like_count FROM stats WHERE id = 1').get();
+  db.close();
+  return { likeCount: row.like_count };
+}
+
+function incShare() {
+  const db = getDb();
+  db.prepare('UPDATE stats SET share_count = share_count + 1 WHERE id = 1').run();
+  const row = db.prepare('SELECT share_count FROM stats WHERE id = 1').get();
+  db.close();
+  return { shareCount: row.share_count };
+}
+
+function joinViewer(viewerId) {
+  const db = getDb();
+  const now = Date.now();
+  db.prepare('INSERT OR REPLACE INTO viewers (viewer_id, updated_at) VALUES (?, ?)').run(viewerId, now);
+  db.prepare('DELETE FROM viewers WHERE updated_at < ?').run(now - 120000);
+  const row = db.prepare('SELECT COUNT(*) as n FROM viewers').get();
+  db.prepare('UPDATE stats SET watching_now = ? WHERE id = 1').run(row.n);
+  db.close();
+  return row.n;
+}
+
+function leaveViewer(viewerId) {
+  const db = getDb();
+  db.prepare('DELETE FROM viewers WHERE viewer_id = ?').run(viewerId);
+  const row = db.prepare('SELECT COUNT(*) as n FROM viewers').get();
+  db.prepare('UPDATE stats SET watching_now = ? WHERE id = 1').run(row.n);
+  db.close();
+  return row.n;
+}
+
+function getComments(limit = 100) {
+  const db = getDb();
+  const rows = db.prepare(
+    'SELECT id, content, nickname, created_at FROM comments ORDER BY id DESC LIMIT ?'
+  ).all(limit);
+  db.close();
+  return rows.reverse().map((r) => ({
+    id: r.id,
+    content: r.content,
+    nickname: r.nickname || '游客',
+    createdAt: r.created_at,
+  }));
+}
+
+function addComment(content, nickname) {
+  const db = getDb();
+  const now = Date.now();
+  const r = db.prepare('INSERT INTO comments (content, nickname, created_at) VALUES (?, ?, ?)').run(
+    String(content).trim().slice(0, 200) || '（空）',
+    nickname ? String(nickname).trim().slice(0, 32) : null,
+    now
+  );
+  db.close();
+  return { id: r.lastInsertRowid, content: content.trim().slice(0, 200), nickname: nickname || '游客', createdAt: now };
+}
+
+module.exports = {
+  initDb,
+  getConfig,
+  getStats,
+  incView,
+  incLike,
+  incShare,
+  joinViewer,
+  leaveViewer,
+  getComments,
+  addComment,
+};