feat: add M3uXtreamAdapter service for unified API handling

server/services/m3uXtreamAdapter.js

@@ -0,0 +1,133 @@
+/**
+ * M3U Xtream Adapter
+ * 
+ * Makes M3U sources respond to Xtream-style API methods.
+ * Queries data from SQLite (already synced during source refresh).
+ */
+
+const { getDb } = require('../db/sqlite');
+
+class M3uXtreamAdapter {
+    constructor(sourceId) {
+        this.sourceId = sourceId;
+    }
+
+    /**
+     * Get live categories (groups) for this M3U source.
+     * Returns Xtream-compatible format: [{ category_id, category_name, parent_id }]
+     */
+    getLiveCategories(includeHidden = false) {
+        const db = getDb();
+
+        // M3U stores group name in category_id field of playlist_items
+        // We need to aggregate unique groups with counts
+        let query = `
+            SELECT 
+                category_id,
+                category_id as category_name,
+                NULL as parent_id,
+                COUNT(*) as channel_count
+            FROM playlist_items 
+            WHERE source_id = ? AND type = 'live'
+            ${!includeHidden ? 'AND is_hidden = 0' : ''}
+            GROUP BY category_id
+            ORDER BY category_id ASC
+        `;
+
+        const rows = db.prepare(query).all(this.sourceId);
+
+        return rows.map(row => ({
+            category_id: row.category_id || 'Uncategorized',
+            category_name: row.category_id || 'Uncategorized',
+            parent_id: null,
+            // Bonus: include count for lazy-loading UI
+            channel_count: row.channel_count
+        }));
+    }
+
+    /**
+     * Get live streams (channels), optionally filtered by category.
+     * Returns Xtream-compatible format: [{ stream_id, name, stream_icon, category_id, ... }]
+     */
+    getLiveStreams(categoryId = null, includeHidden = false) {
+        const db = getDb();
+
+        let query = `
+            SELECT 
+                item_id as stream_id,
+                name,
+                stream_icon,
+                stream_url,
+                category_id,
+                added_at,
+                data
+            FROM playlist_items 
+            WHERE source_id = ? AND type = 'live'
+            ${!includeHidden ? 'AND is_hidden = 0' : ''}
+        `;
+
+        const params = [this.sourceId];
+
+        if (categoryId) {
+            query += ` AND category_id = ?`;
+            params.push(categoryId);
+        }
+
+        query += ` ORDER BY name ASC`;
+
+        const rows = db.prepare(query).all(...params);
+
+        return rows.map(row => {
+            // Parse any extra data stored as JSON
+            let extra = {};
+            if (row.data) {
+                try { extra = JSON.parse(row.data); } catch (e) { }
+            }
+
+            return {
+                stream_id: row.stream_id,
+                name: row.name,
+                stream_icon: row.stream_icon,
+                category_id: row.category_id,
+                added: row.added_at,
+                // M3U-specific: direct stream URL (Xtream builds URLs from credentials)
+                stream_url: row.stream_url,
+                // Include extra fields from parser (tvgId, etc.)
+                epg_channel_id: extra.tvgId || null,
+                ...extra
+            };
+        });
+    }
+
+    /**
+     * Build stream URL for playback.
+     * For M3U, we return the stored URL directly (no credential building).
+     */
+    buildStreamUrl(streamId, type = 'live', container = 'ts') {
+        const db = getDb();
+
+        const row = db.prepare(`
+            SELECT stream_url FROM playlist_items 
+            WHERE source_id = ? AND item_id = ?
+        `).get(this.sourceId, streamId);
+
+        return row?.stream_url || null;
+    }
+
+    /**
+     * Get XMLTV EPG URL - M3U sources don't have built-in EPG URLs.
+     * Returns null; EPG must be configured as a separate source.
+     */
+    getXmltvUrl() {
+        return null;
+    }
+}
+
+/**
+ * Factory function to create adapter from source ID
+ */
+function createFromSourceId(sourceId) {
+    return new M3uXtreamAdapter(sourceId);
+}
+
+module.exports = { M3uXtreamAdapter, createFromSourceId };