feat: initial implementation of Light Chat app with React, Capacitor, and comprehensive tests

src/services/sessionService.js

@@ -0,0 +1,169 @@
+/**
+ * Session Management Service
+ * Handles creation, storage, and retrieval of chat sessions
+ */
+
+const STORAGE_KEY = 'light-chat-sessions'
+const CONFIG_KEY = 'light-chat-config'
+
+/**
+ * Generate unique session ID
+ * @returns {string}
+ */
+function generateId() {
+  return Date.now().toString(36) + Math.random().toString(36).substr(2)
+}
+
+/**
+ * Default session structure
+ */
+function createSession(endpoint = '', systemPrompt = '') {
+  return {
+    id: generateId(),
+    name: `Session ${new Date().toLocaleTimeString()}`,
+    endpoint,
+    systemPrompt,
+    messages: [],
+    createdAt: Date.now(),
+    updatedAt: Date.now()
+  }
+}
+
+/**
+ * Load all sessions from storage
+ * @returns {Array}
+ */
+export function loadSessions() {
+  try {
+    const data = localStorage.getItem(STORAGE_KEY)
+    return data ? JSON.parse(data) : []
+  } catch (error) {
+    console.error('Failed to load sessions:', error)
+    return []
+  }
+}
+
+/**
+ * Save sessions to storage
+ * @param {Array} sessions
+ */
+export function saveSessions(sessions) {
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(sessions))
+  } catch (error) {
+    console.error('Failed to save sessions:', error)
+  }
+}
+
+/**
+ * Load API configuration
+ * @returns {Object} { endpoint, systemPrompt }
+ */
+export function loadConfig() {
+  try {
+    const data = localStorage.getItem(CONFIG_KEY)
+    return data ? JSON.parse(data) : { endpoint: '', systemPrompt: '' }
+  } catch (error) {
+    console.error('Failed to load config:', error)
+    return { endpoint: '', systemPrompt: '' }
+  }
+}
+
+/**
+ * Save API configuration
+ * @param {Object} config
+ */
+export function saveConfig(config) {
+  try {
+    localStorage.setItem(CONFIG_KEY, JSON.stringify(config))
+  } catch (error) {
+    console.error('Failed to save config:', error)
+  }
+}
+
+/**
+ * Add a new session
+ * @param {Object} options
+ * @returns {Object} new session
+ */
+export function addSession(options = {}) {
+  const sessions = loadSessions()
+  const newSession = createSession(
+    options.endpoint,
+    options.systemPrompt
+  )
+  sessions.push(newSession)
+  saveSessions(sessions)
+  return newSession
+}
+
+/**
+ * Delete a session
+ * @param {string} sessionId
+ * @returns {boolean}
+ */
+export function deleteSession(sessionId) {
+  const sessions = loadSessions()
+  const filtered = sessions.filter(s => s.id !== sessionId)
+  if (filtered.length === sessions.length) {
+    return false
+  }
+  saveSessions(filtered)
+  return true
+}
+
+/**
+ * Update a session
+ * @param {string} sessionId
+ * @param {Object} updates
+ * @returns {Object|null} updated session or null
+ */
+export function updateSession(sessionId, updates) {
+  const sessions = loadSessions()
+  const index = sessions.findIndex(s => s.id === sessionId)
+
+  if (index === -1) {
+    return null
+  }
+
+  sessions[index] = {
+    ...sessions[index],
+    ...updates,
+    updatedAt: Date.now()
+  }
+
+  // Update name if messages exist and name is default
+  if (sessions[index].messages.length > 0 && sessions[index].name.startsWith('Session')) {
+    sessions[index].name = `Chat ${new Date(sessions[index].createdAt).toLocaleDateString()}`
+  }
+
+  saveSessions(sessions)
+  return sessions[index]
+}
+
+/**
+ * Get a specific session
+ * @param {string} sessionId
+ * @returns {Object|null}
+ */
+export function getSession(sessionId) {
+  const sessions = loadSessions()
+  return sessions.find(s => s.id === sessionId) || null
+}
+
+/**
+ * Add message to a session
+ * @param {string} sessionId
+ * @param {Object} message - { role: 'user'|'assistant', content: string }
+ * @returns {Object|null} updated session
+ */
+export function addMessage(sessionId, message) {
+  const session = getSession(sessionId)
+
+  if (!session) {
+    return null
+  }
+
+  session.messages.push(message)
+  return updateSession(sessionId, { messages: session.messages })
+}