/**
 * DailyNotificationTTLEnforcerTest.java
 * 
 * Unit tests for TTL-at-fire enforcement functionality
 * Tests freshness validation, TTL violation logging, and skip logic
 * 
 * @author Matthew Raymer
 * @version 1.0.0
 */

package com.timesafari.dailynotification;

import android.content.Context;
import android.test.AndroidTestCase;
import android.test.mock.MockContext;

import java.util.concurrent.TimeUnit;

/**
 * Unit tests for DailyNotificationTTLEnforcer
 * 
 * Tests the core TTL enforcement functionality including:
 * - Freshness validation before arming
 * - TTL violation detection and logging
 * - Skip logic for stale content
 * - Configuration retrieval from storage
 */
public class DailyNotificationTTLEnforcerTest extends AndroidTestCase {
    
    private DailyNotificationTTLEnforcer ttlEnforcer;
    private Context mockContext;
    private DailyNotificationDatabase database;
    
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        
        // Create mock context
        mockContext = new MockContext() {
            @Override
            public android.content.SharedPreferences getSharedPreferences(String name, int mode) {
                return getContext().getSharedPreferences(name, mode);
            }
        };
        
        // Create database instance
        database = new DailyNotificationDatabase(mockContext);
        
        // Create TTL enforcer with SQLite storage
        ttlEnforcer = new DailyNotificationTTLEnforcer(mockContext, database, true);
    }
    
    @Override
    protected void tearDown() throws Exception {
        if (database != null) {
            database.close();
        }
        super.tearDown();
    }
    
    /**
     * Test freshness validation with fresh content
     */
    public void testFreshContentValidation() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30); // 30 minutes from now
        long fetchedAt = currentTime - TimeUnit.MINUTES.toMillis(5); // 5 minutes ago
        
        boolean isFresh = ttlEnforcer.isContentFresh("test_slot_1", scheduledTime, fetchedAt);
        
        assertTrue("Content should be fresh (5 min old, scheduled 30 min from now)", isFresh);
    }
    
    /**
     * Test freshness validation with stale content
     */
    public void testStaleContentValidation() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30); // 30 minutes from now
        long fetchedAt = currentTime - TimeUnit.HOURS.toMillis(2); // 2 hours ago
        
        boolean isFresh = ttlEnforcer.isContentFresh("test_slot_2", scheduledTime, fetchedAt);
        
        assertFalse("Content should be stale (2 hours old, exceeds 1 hour TTL)", isFresh);
    }
    
    /**
     * Test TTL violation detection
     */
    public void testTTLViolationDetection() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.HOURS.toMillis(2); // 2 hours ago
        
        // This should trigger a TTL violation
        boolean isFresh = ttlEnforcer.isContentFresh("test_slot_3", scheduledTime, fetchedAt);
        
        assertFalse("Should detect TTL violation", isFresh);
        
        // Check that violation was logged (we can't easily test the actual logging,
        // but we can verify the method returns false as expected)
    }
    
    /**
     * Test validateBeforeArming with fresh content
     */
    public void testValidateBeforeArmingFresh() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.MINUTES.toMillis(5);
        
        NotificationContent content = new NotificationContent();
        content.setId("test_slot_4");
        content.setScheduledTime(scheduledTime);
        content.setFetchedAt(fetchedAt);
        content.setTitle("Test Notification");
        content.setBody("Test body");
        
        boolean shouldArm = ttlEnforcer.validateBeforeArming(content);
        
        assertTrue("Should arm fresh content", shouldArm);
    }
    
    /**
     * Test validateBeforeArming with stale content
     */
    public void testValidateBeforeArmingStale() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.HOURS.toMillis(2);
        
        NotificationContent content = new NotificationContent();
        content.setId("test_slot_5");
        content.setScheduledTime(scheduledTime);
        content.setFetchedAt(fetchedAt);
        content.setTitle("Test Notification");
        content.setBody("Test body");
        
        boolean shouldArm = ttlEnforcer.validateBeforeArming(content);
        
        assertFalse("Should not arm stale content", shouldArm);
    }
    
    /**
     * Test edge case: content fetched exactly at TTL limit
     */
    public void testTTLBoundaryCase() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.HOURS.toMillis(1); // Exactly 1 hour ago (TTL limit)
        
        boolean isFresh = ttlEnforcer.isContentFresh("test_slot_6", scheduledTime, fetchedAt);
        
        assertTrue("Content at TTL boundary should be considered fresh", isFresh);
    }
    
    /**
     * Test edge case: content fetched just over TTL limit
     */
    public void testTTLBoundaryCaseOver() {
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.HOURS.toMillis(1) - TimeUnit.SECONDS.toMillis(1); // 1 hour + 1 second ago
        
        boolean isFresh = ttlEnforcer.isContentFresh("test_slot_7", scheduledTime, fetchedAt);
        
        assertFalse("Content just over TTL limit should be considered stale", isFresh);
    }
    
    /**
     * Test TTL violation statistics
     */
    public void testTTLViolationStats() {
        // Generate some TTL violations
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.HOURS.toMillis(2);
        
        // Trigger TTL violations
        ttlEnforcer.isContentFresh("test_slot_8", scheduledTime, fetchedAt);
        ttlEnforcer.isContentFresh("test_slot_9", scheduledTime, fetchedAt);
        
        String stats = ttlEnforcer.getTTLViolationStats();
        
        assertNotNull("TTL violation stats should not be null", stats);
        assertTrue("Stats should contain violation count", stats.contains("violations"));
    }
    
    /**
     * Test error handling with invalid parameters
     */
    public void testErrorHandling() {
        // Test with null slot ID
        boolean result = ttlEnforcer.isContentFresh(null, System.currentTimeMillis(), System.currentTimeMillis());
        assertFalse("Should handle null slot ID gracefully", result);
        
        // Test with invalid timestamps
        result = ttlEnforcer.isContentFresh("test_slot_10", 0, 0);
        assertTrue("Should handle invalid timestamps gracefully", result);
    }
    
    /**
     * Test TTL configuration retrieval
     */
    public void testTTLConfiguration() {
        // Test that TTL enforcer can retrieve configuration
        // This is indirectly tested through the freshness checks
        long currentTime = System.currentTimeMillis();
        long scheduledTime = currentTime + TimeUnit.MINUTES.toMillis(30);
        long fetchedAt = currentTime - TimeUnit.MINUTES.toMillis(30); // 30 minutes ago
        
        boolean isFresh = ttlEnforcer.isContentFresh("test_slot_11", scheduledTime, fetchedAt);
        
        // Should be fresh (30 min < 1 hour TTL)
        assertTrue("Should retrieve TTL configuration correctly", isFresh);
    }
}