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* Persistent Storage Manager
*
* จัดการการบันทึกและโหลดการตั้งค่าทั้งหมด (positions, edits, layouts)
* รองรับ localStorage และ Export/Import JSON
* Auto-save ทุก 2-3 วินาที
*
* @author Chahua Development Co., Ltd.
* @version 2.1.0
*/
export class PersistentStorage {
constructor() {
this.currentFilePath = null;
this.autoSaveInterval = null;
this.autoSaveDelay = 2000; // 2 วินาที
this.hasUnsavedChanges = false;
// Storage keys
this.STORAGE_PREFIX = 'chahua-md-presenter';
this.POSITIONS_KEY = 'positions';
this.EDITS_KEY = 'edits';
this.LAYOUTS_KEY = 'layouts';
this.SETTINGS_KEY = 'settings';
this.init();
}
init() {
// Listen for changes
this.setupEventListeners();
// Auto-save on window close
window.addEventListener('beforeunload', () => {
if (this.hasUnsavedChanges) {
this.save();
}
});
}
/**
* Setup event listeners สำหรับ auto-save
*/
setupEventListeners() {
// Listen for position changes
document.addEventListener('positionChanged', () => {
this.hasUnsavedChanges = true;
this.scheduleAutoSave();
});
// Listen for content changes
document.addEventListener('contentChanged', () => {
this.hasUnsavedChanges = true;
this.scheduleAutoSave();
});
// Listen for layout changes
document.addEventListener('layoutChanged', () => {
this.hasUnsavedChanges = true;
this.scheduleAutoSave();
});
}
/**
* กำหนดไฟล์ปัจจุบัน
*
* @param {string} filePath
*/
setCurrentFile(filePath) {
this.currentFilePath = filePath;
}
/**
* สร้าง storage key จาก file path และ slide index
*
* @param {string} filePath
* @param {number} slideIndex
* @param {string} dataType - 'positions', 'edits', 'layouts', 'settings'
* @returns {string}
*/
getStorageKey(filePath, slideIndex = null, dataType = 'positions') {
const cleanPath = this.sanitizeFilePath(filePath);
const slideKey = slideIndex !== null ? `:slide-${slideIndex}` : '';
return `${this.STORAGE_PREFIX}:${cleanPath}${slideKey}:${dataType}`;
}
/**
* Sanitize file path สำหรับใช้เป็น key
*
* @param {string} filePath
* @returns {string}
*/
sanitizeFilePath(filePath) {
if (!filePath) return 'untitled';
// แปลง path เป็น hash เพื่อให้สั้นลง
return this.simpleHash(filePath);
}
/**
* Simple hash function
*
* @param {string} str
* @returns {string}
*/
simpleHash(str) {
let hash = 0;
for (let i = 0; i < str.length; i++) {
const char = str.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash;
}
return Math.abs(hash).toString(36);
}
/**
* บันทึก positions สำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
* @param {Object} positions
*/
savePositions(filePath, slideIndex, positions) {
const key = this.getStorageKey(filePath, slideIndex, this.POSITIONS_KEY);
const data = {
timestamp: Date.now(),
filePath,
slideIndex,
positions
};
try {
localStorage.setItem(key, JSON.stringify(data));
return true;
} catch (error) {
console.error('Failed to save positions:', error);
return false;
}
}
/**
* โหลด positions สำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
* @returns {Object|null}
*/
loadPositions(filePath, slideIndex) {
const key = this.getStorageKey(filePath, slideIndex, this.POSITIONS_KEY);
try {
const data = localStorage.getItem(key);
if (!data) return null;
const parsed = JSON.parse(data);
return parsed.positions;
} catch (error) {
console.error('Failed to load positions:', error);
return null;
}
}
/**
* บันทึก content edits สำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
* @param {Object} edits
*/
saveEdits(filePath, slideIndex, edits) {
const key = this.getStorageKey(filePath, slideIndex, this.EDITS_KEY);
const data = {
timestamp: Date.now(),
filePath,
slideIndex,
edits
};
try {
localStorage.setItem(key, JSON.stringify(data));
return true;
} catch (error) {
console.error('Failed to save edits:', error);
return false;
}
}
/**
* โหลด content edits สำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
* @returns {Object|null}
*/
loadEdits(filePath, slideIndex) {
const key = this.getStorageKey(filePath, slideIndex, this.EDITS_KEY);
try {
const data = localStorage.getItem(key);
if (!data) return null;
const parsed = JSON.parse(data);
return parsed.edits;
} catch (error) {
console.error('Failed to load edits:', error);
return null;
}
}
/**
* บันทึก layout settings สำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
* @param {Object} layout
*/
saveLayout(filePath, slideIndex, layout) {
const key = this.getStorageKey(filePath, slideIndex, this.LAYOUTS_KEY);
const data = {
timestamp: Date.now(),
filePath,
slideIndex,
layout
};
try {
localStorage.setItem(key, JSON.stringify(data));
return true;
} catch (error) {
console.error('Failed to save layout:', error);
return false;
}
}
/**
* โหลด layout settings สำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
* @returns {Object|null}
*/
loadLayout(filePath, slideIndex) {
const key = this.getStorageKey(filePath, slideIndex, this.LAYOUTS_KEY);
try {
const data = localStorage.getItem(key);
if (!data) return null;
const parsed = JSON.parse(data);
return parsed.layout;
} catch (error) {
console.error('Failed to load layout:', error);
return null;
}
}
/**
* บันทึกทุกอย่างสำหรับไฟล์ปัจจุบัน
*
* @param {Array} allData - Array of {slideIndex, positions, edits, layout}
*/
saveAll(filePath, allData) {
let savedCount = 0;
allData.forEach(slideData => {
const { slideIndex, positions, edits, layout } = slideData;
if (positions) {
this.savePositions(filePath, slideIndex, positions);
savedCount++;
}
if (edits) {
this.saveEdits(filePath, slideIndex, edits);
savedCount++;
}
if (layout) {
this.saveLayout(filePath, slideIndex, layout);
savedCount++;
}
});
this.hasUnsavedChanges = false;
return savedCount;
}
/**
* โหลดทุกอย่างสำหรับไฟล์ปัจจุบัน
*
* @param {string} filePath
* @param {number} totalSlides
* @returns {Array}
*/
loadAll(filePath, totalSlides) {
const allData = [];
for (let i = 0; i < totalSlides; i++) {
const positions = this.loadPositions(filePath, i);
const edits = this.loadEdits(filePath, i);
const layout = this.loadLayout(filePath, i);
if (positions || edits || layout) {
allData.push({
slideIndex: i,
positions,
edits,
layout
});
}
}
return allData;
}
/**
* Export ทุกอย่างเป็น JSON file
*
* @param {string} filePath
* @param {number} totalSlides
* @returns {string} - JSON string
*/
exportToJSON(filePath, totalSlides) {
const allData = this.loadAll(filePath, totalSlides);
const exportData = {
version: '2.1.0',
exportedAt: new Date().toISOString(),
filePath,
totalSlides,
slides: allData
};
return JSON.stringify(exportData, null, 2);
}
/**
* Import จาก JSON file
*
* @param {string} jsonString
* @returns {boolean}
*/
importFromJSON(jsonString) {
try {
const data = JSON.parse(jsonString);
if (!data.version || !data.slides) {
throw new Error('Invalid JSON format');
}
const { filePath, slides } = data;
slides.forEach(slideData => {
const { slideIndex, positions, edits, layout } = slideData;
if (positions) {
this.savePositions(filePath, slideIndex, positions);
}
if (edits) {
this.saveEdits(filePath, slideIndex, edits);
}
if (layout) {
this.saveLayout(filePath, slideIndex, layout);
}
});
return true;
} catch (error) {
console.error('Failed to import JSON:', error);
return false;
}
}
/**
* Download JSON file
*
* @param {string} filePath
* @param {number} totalSlides
*/
downloadJSON(filePath, totalSlides) {
const json = this.exportToJSON(filePath, totalSlides);
const blob = new Blob([json], { type: 'application/json' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `presentation-settings-${Date.now()}.json`;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
}
/**
* Schedule auto-save
*/
scheduleAutoSave() {
if (this.autoSaveInterval) {
clearTimeout(this.autoSaveInterval);
}
this.autoSaveInterval = setTimeout(() => {
this.save();
}, this.autoSaveDelay);
}
/**
* บันทึกทันที (manual save)
*/
save() {
if (!this.hasUnsavedChanges) return;
// Trigger save event
const event = new CustomEvent('persistentStorageSave', {
detail: {
filePath: this.currentFilePath,
timestamp: Date.now()
}
});
document.dispatchEvent(event);
this.hasUnsavedChanges = false;
}
/**
* ลบข้อมูลสำหรับ slide หนึ่ง
*
* @param {string} filePath
* @param {number} slideIndex
*/
clearSlide(filePath, slideIndex) {
const posKey = this.getStorageKey(filePath, slideIndex, this.POSITIONS_KEY);
const editKey = this.getStorageKey(filePath, slideIndex, this.EDITS_KEY);
const layoutKey = this.getStorageKey(filePath, slideIndex, this.LAYOUTS_KEY);
localStorage.removeItem(posKey);
localStorage.removeItem(editKey);
localStorage.removeItem(layoutKey);
}
/**
* ลบข้อมูลทั้งหมดสำหรับไฟล์หนึ่ง
*
* @param {string} filePath
*/
clearFile(filePath) {
const prefix = `${this.STORAGE_PREFIX}:${this.sanitizeFilePath(filePath)}`;
// หา keys ทั้งหมดที่ตรงกับ prefix
const keysToRemove = [];
for (let i = 0; i < localStorage.length; i++) {
const key = localStorage.key(i);
if (key.startsWith(prefix)) {
keysToRemove.push(key);
}
}
// ลบทั้งหมด
keysToRemove.forEach(key => localStorage.removeItem(key));
}
/**
* ลบข้อมูลทั้งหมด
*/
clearAll() {
const keysToRemove = [];
for (let i = 0; i < localStorage.length; i++) {
const key = localStorage.key(i);
if (key.startsWith(this.STORAGE_PREFIX)) {
keysToRemove.push(key);
}
}
keysToRemove.forEach(key => localStorage.removeItem(key));
}
/**
* Get storage usage info
*
* @returns {Object}
*/
getStorageInfo() {
let totalSize = 0;
let itemCount = 0;
for (let i = 0; i < localStorage.length; i++) {
const key = localStorage.key(i);
if (key.startsWith(this.STORAGE_PREFIX)) {
const value = localStorage.getItem(key);
totalSize += key.length + value.length;
itemCount++;
}
}
return {
itemCount,
totalSize,
totalSizeKB: (totalSize / 1024).toFixed(2),
maxSize: 5120, // 5MB typical localStorage limit
usagePercent: ((totalSize / (5 * 1024 * 1024)) * 100).toFixed(2)
};
}
/**
* Cleanup old data (optional)
* ลบข้อมูลที่เก่ากว่า X วัน
*
* @param {number} daysOld
*/
cleanupOldData(daysOld = 30) {
const cutoffTime = Date.now() - (daysOld * 24 * 60 * 60 * 1000);
const keysToRemove = [];
for (let i = 0; i < localStorage.length; i++) {
const key = localStorage.key(i);
if (!key.startsWith(this.STORAGE_PREFIX)) continue;
try {
const data = JSON.parse(localStorage.getItem(key));
if (data.timestamp && data.timestamp < cutoffTime) {
keysToRemove.push(key);
}
} catch (error) {
// Invalid JSON, skip
}
}
keysToRemove.forEach(key => localStorage.removeItem(key));
return keysToRemove.length;
}
}
export default PersistentStorage;
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