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src/main/store.js

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+const fs = require('fs');
+const path = require('path');
+const crypto = require('crypto');
+const { app } = require('electron');
+
+function dataDir() {
+  const dir = path.join(app.getPath('userData'), 'data');
+  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+  return dir;
+}
+
+function providersPath() {
+  return path.join(dataDir(), 'providers.json');
+}
+
+function conversationsDir() {
+  const dir = path.join(dataDir(), 'conversations');
+  if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+  return dir;
+}
+
+function readJSON(file, fallback) {
+  try {
+    if (!fs.existsSync(file)) return fallback;
+    return JSON.parse(fs.readFileSync(file, 'utf8'));
+  } catch {
+    return fallback;
+  }
+}
+
+function writeJSON(file, data) {
+  fs.writeFileSync(file, JSON.stringify(data, null, 2), 'utf8');
+}
+
+function getProviders() {
+  return readJSON(providersPath(), []);
+}
+
+function saveProviders(list) {
+  writeJSON(providersPath(), list);
+}
+
+function upsertProvider(provider) {
+  const list = getProviders();
+  if (!provider.id) provider.id = crypto.randomUUID();
+  const idx = list.findIndex((p) => p.id === provider.id);
+  if (idx >= 0) list[idx] = { ...list[idx], ...provider };
+  else list.push(provider);
+  saveProviders(list);
+  return provider;
+}
+
+function deleteProvider(id) {
+  saveProviders(getProviders().filter((p) => p.id !== id));
+}
+
+function getConversationList() {
+  const dir = conversationsDir();
+  const files = fs.readdirSync(dir).filter((f) => f.endsWith('.json'));
+  const items = files.map((f) => {
+    try {
+      const c = JSON.parse(fs.readFileSync(path.join(dir, f), 'utf8'));
+      return {
+        id: c.id,
+        title: c.title,
+        providerId: c.providerId,
+        model: c.model,
+        createdAt: c.createdAt,
+        updatedAt: c.updatedAt,
+        messageCount: (c.messages || []).length,
+      };
+    } catch {
+      return null;
+    }
+  }).filter(Boolean);
+  items.sort((a, b) => (b.updatedAt || 0) - (a.updatedAt || 0));
+  return items;
+}
+
+function getConversation(id) {
+  const file = path.join(conversationsDir(), `${id}.json`);
+  return readJSON(file, null);
+}
+
+function saveConversation(conv) {
+  if (!conv.id) conv.id = crypto.randomUUID();
+  const now = Date.now();
+  if (!conv.createdAt) conv.createdAt = now;
+  conv.updatedAt = now;
+  writeJSON(path.join(conversationsDir(), `${conv.id}.json`), conv);
+  return conv;
+}
+
+function deleteConversation(id) {
+  const file = path.join(conversationsDir(), `${id}.json`);
+  if (fs.existsSync(file)) fs.unlinkSync(file);
+}
+
+function clearAllConversations() {
+  const dir = conversationsDir();
+  fs.readdirSync(dir).filter((f) => f.endsWith('.json')).forEach((f) => {
+    fs.unlinkSync(path.join(dir, f));
+  });
+}
+
+function renameConversation(id, title) {
+  const conv = getConversation(id);
+  if (!conv) return null;
+  conv.title = title;
+  conv.updatedAt = Date.now();
+  writeJSON(path.join(conversationsDir(), `${id}.json`), conv);
+  return conv;
+}
+
+module.exports = {
+  getProviders,
+  upsertProvider,
+  deleteProvider,
+  getConversationList,
+  getConversation,
+  saveConversation,
+  deleteConversation,
+  clearAllConversations,
+  renameConversation,
+};