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/**
* Aqua-Lens Local Database
* IndexedDB-based storage for water quality data
*/
class WaterQualityDatabase {
constructor() {
this.dbName = 'AquaLensDB';
this.version = 1;
this.db = null;
}
/**
* Initialize the database
*/
async init() {
return new Promise((resolve, reject) => {
const request = indexedDB.open(this.dbName, this.version);
request.onerror = () => reject(request.error);
request.onsuccess = () => {
this.db = request.result;
resolve(this.db);
};
request.onupgradeneeded = (event) => {
const db = event.target.result;
// Water tests store
if (!db.objectStoreNames.contains('waterTests')) {
const testStore = db.createObjectStore('waterTests', { keyPath: 'id' });
testStore.createIndex('timestamp', 'timestamp', { unique: false });
testStore.createIndex('waterSource', 'waterSource', { unique: false });
testStore.createIndex('safetyLevel', 'safetyLevel', { unique: false });
testStore.createIndex('location', ['latitude', 'longitude'], { unique: false });
}
// Alerts store
if (!db.objectStoreNames.contains('alerts')) {
const alertStore = db.createObjectStore('alerts', { keyPath: 'id' });
alertStore.createIndex('timestamp', 'timestamp', { unique: false });
alertStore.createIndex('severity', 'severity', { unique: false });
alertStore.createIndex('resolved', 'resolved', { unique: false });
}
// User preferences store
if (!db.objectStoreNames.contains('userPreferences')) {
db.createObjectStore('userPreferences', { keyPath: 'key' });
}
// Calibration data store
if (!db.objectStoreNames.contains('calibrationData')) {
const calStore = db.createObjectStore('calibrationData', { keyPath: 'id' });
calStore.createIndex('parameter', 'parameter', { unique: false });
}
};
});
}
/**
* Save a water test result
*/
async saveWaterTest(testData) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['waterTests'], 'readwrite');
const store = transaction.objectStore('waterTests');
const testRecord = {
id: testData.id || this.generateId(),
timestamp: testData.timestamp || new Date().toISOString(),
waterSource: testData.waterSource,
latitude: testData.location?.latitude || null,
longitude: testData.location?.longitude || null,
results: testData.results,
overallQuality: testData.overallQuality,
safetyLevel: testData.safetyLevel,
confidence: testData.confidence,
alerts: testData.alerts || [],
recommendations: testData.recommendations || [],
imageData: testData.imageData || null,
processingMethod: testData.processingMethod,
colorAccuracy: testData.colorAccuracy,
metadata: {
colorChannels: testData.colorChannels,
lightingConditions: testData.lightingConditions,
regionsDetected: testData.regionsDetected
}
};
const request = store.add(testRecord);
request.onsuccess = () => {
// Create alerts if unsafe
if (testData.safetyLevel === 'Unsafe') {
this.createAlert(testRecord);
}
resolve(testRecord);
};
request.onerror = () => reject(request.error);
});
}
/**
* Get all water tests
*/
async getAllWaterTests(limit = 100) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['waterTests'], 'readonly');
const store = transaction.objectStore('waterTests');
const index = store.index('timestamp');
const request = index.openCursor(null, 'prev'); // Newest first
const results = [];
let count = 0;
request.onsuccess = (event) => {
const cursor = event.target.result;
if (cursor && count < limit) {
results.push(cursor.value);
count++;
cursor.continue();
} else {
resolve(results);
}
};
request.onerror = () => reject(request.error);
});
}
/**
* Get water tests by location (within radius)
*/
async getWaterTestsByLocation(latitude, longitude, radiusKm = 10) {
const allTests = await this.getAllWaterTests(1000);
return allTests.filter(test => {
if (!test.latitude || !test.longitude) return false;
const distance = this.calculateDistance(
latitude, longitude,
test.latitude, test.longitude
);
return distance <= radiusKm;
});
}
/**
* Get water tests by source type
*/
async getWaterTestsBySource(waterSource) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['waterTests'], 'readonly');
const store = transaction.objectStore('waterTests');
const index = store.index('waterSource');
const request = index.getAll(waterSource);
request.onsuccess = () => resolve(request.result);
request.onerror = () => reject(request.error);
});
}
/**
* Create an alert for unsafe water
*/
async createAlert(testData) {
if (!this.db) await this.init();
const alert = {
id: this.generateId(),
testId: testData.id,
type: 'contamination',
severity: testData.safetyLevel === 'Unsafe' ? 'high' : 'medium',
message: `Unsafe water detected: ${testData.alerts.join(', ')}`,
timestamp: new Date().toISOString(),
latitude: testData.latitude,
longitude: testData.longitude,
resolved: false,
waterSource: testData.waterSource
};
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['alerts'], 'readwrite');
const store = transaction.objectStore('alerts');
const request = store.add(alert);
request.onsuccess = () => resolve(alert);
request.onerror = () => reject(request.error);
});
}
/**
* Get all alerts
*/
async getAllAlerts(includeResolved = false) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['alerts'], 'readonly');
const store = transaction.objectStore('alerts');
const index = store.index('timestamp');
const request = index.openCursor(null, 'prev');
const results = [];
request.onsuccess = (event) => {
const cursor = event.target.result;
if (cursor) {
const alert = cursor.value;
if (includeResolved || !alert.resolved) {
results.push(alert);
}
cursor.continue();
} else {
resolve(results);
}
};
request.onerror = () => reject(request.error);
});
}
/**
* Get alerts by location
*/
async getAlertsByLocation(latitude, longitude, radiusKm = 50) {
const allAlerts = await this.getAllAlerts();
return allAlerts.filter(alert => {
if (!alert.latitude || !alert.longitude) return false;
const distance = this.calculateDistance(
latitude, longitude,
alert.latitude, alert.longitude
);
return distance <= radiusKm;
});
}
/**
* Resolve an alert
*/
async resolveAlert(alertId) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['alerts'], 'readwrite');
const store = transaction.objectStore('alerts');
const getRequest = store.get(alertId);
getRequest.onsuccess = () => {
const alert = getRequest.result;
if (alert) {
alert.resolved = true;
alert.resolvedTimestamp = new Date().toISOString();
const putRequest = store.put(alert);
putRequest.onsuccess = () => resolve(alert);
putRequest.onerror = () => reject(putRequest.error);
} else {
reject(new Error('Alert not found'));
}
};
getRequest.onerror = () => reject(getRequest.error);
});
}
/**
* Save user preferences
*/
async saveUserPreference(key, value) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['userPreferences'], 'readwrite');
const store = transaction.objectStore('userPreferences');
const request = store.put({ key, value, timestamp: new Date().toISOString() });
request.onsuccess = () => resolve(value);
request.onerror = () => reject(request.error);
});
}
/**
* Get user preference
*/
async getUserPreference(key, defaultValue = null) {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['userPreferences'], 'readonly');
const store = transaction.objectStore('userPreferences');
const request = store.get(key);
request.onsuccess = () => {
const result = request.result;
resolve(result ? result.value : defaultValue);
};
request.onerror = () => reject(request.error);
});
}
/**
* Get statistics
*/
async getStatistics() {
const allTests = await this.getAllWaterTests(10000);
const allAlerts = await this.getAllAlerts();
const stats = {
totalTests: allTests.length,
safeTests: allTests.filter(t => t.safetyLevel === 'Safe').length,
unsafeTests: allTests.filter(t => t.safetyLevel === 'Unsafe').length,
activeAlerts: allAlerts.filter(a => !a.resolved).length,
qualityDistribution: {
excellent: allTests.filter(t => t.overallQuality === 'Excellent').length,
good: allTests.filter(t => t.overallQuality === 'Good').length,
fair: allTests.filter(t => t.overallQuality === 'Fair').length,
poor: allTests.filter(t => t.overallQuality === 'Poor').length
},
sourceDistribution: {},
averageConfidence: 0
};
// Calculate source distribution
allTests.forEach(test => {
const source = test.waterSource || 'Unknown';
stats.sourceDistribution[source] = (stats.sourceDistribution[source] || 0) + 1;
});
// Calculate average confidence
if (allTests.length > 0) {
stats.averageConfidence = allTests.reduce((sum, test) => sum + (test.confidence || 0), 0) / allTests.length;
}
return stats;
}
/**
* Calculate distance between two coordinates (Haversine formula)
*/
calculateDistance(lat1, lon1, lat2, lon2) {
const R = 6371; // Earth's radius in kilometers
const dLat = this.toRadians(lat2 - lat1);
const dLon = this.toRadians(lon2 - lon1);
const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos(this.toRadians(lat1)) * Math.cos(this.toRadians(lat2)) *
Math.sin(dLon / 2) * Math.sin(dLon / 2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
return R * c;
}
/**
* Convert degrees to radians
*/
toRadians(degrees) {
return degrees * (Math.PI / 180);
}
/**
* Generate unique ID
*/
generateId() {
return 'aqua_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
}
/**
* Clear all data (for testing/reset)
*/
async clearAllData() {
if (!this.db) await this.init();
const stores = ['waterTests', 'alerts', 'userPreferences', 'calibrationData'];
return Promise.all(stores.map(storeName => {
return new Promise((resolve, reject) => {
const transaction = this.db.transaction([storeName], 'readwrite');
const store = transaction.objectStore(storeName);
const request = store.clear();
request.onsuccess = () => resolve();
request.onerror = () => reject(request.error);
});
}));
}
/**
* Export data as JSON
*/
async exportData() {
const [tests, alerts, preferences] = await Promise.all([
this.getAllWaterTests(10000),
this.getAllAlerts(true),
this.getAllUserPreferences()
]);
return {
waterTests: tests,
alerts: alerts,
userPreferences: preferences,
exportTimestamp: new Date().toISOString(),
version: this.version
};
}
/**
* Get all user preferences
*/
async getAllUserPreferences() {
if (!this.db) await this.init();
return new Promise((resolve, reject) => {
const transaction = this.db.transaction(['userPreferences'], 'readonly');
const store = transaction.objectStore('userPreferences');
const request = store.getAll();
request.onsuccess = () => resolve(request.result);
request.onerror = () => reject(request.error);
});
}
}
// Create singleton instance
export const waterQualityDB = new WaterQualityDatabase();
// Initialize database on import
waterQualityDB.init().catch(console.error);
export default waterQualityDB; |