import { Database } from "bun:sqlite";
import { nanoid } from "nanoid";

const DB_PATH = process.env.STATS_DB_PATH || "./data/stats.db";
const db = new Database(DB_PATH, { create: true });

// Generate realistic fake data
const _imageKeys: string[] = [];
const numImages = 500; // More images for variety

// Generate fake image keys with varying introduction dates
const now = Math.floor(Date.now() / 1000);
const oneYearAgo = now - 365 * 86400;
const _thirtyDaysAgo = now - 30 * 86400;
const oneDayAgo = now - 86400;

interface Image {
	key: string;
	introducedAt: number; // When this image first appeared
	basePopularity: number; // Intrinsic popularity (0-1)
	trendFactor: number; // How much popularity changes over time (-0.5 to 0.5)
	viralPeak?: number; // Optional viral spike timestamp
}

const images: Image[] = [];

// Create images with staggered introduction dates
for (let i = 0; i < numImages; i++) {
	const introDate = oneYearAgo + Math.random() * (now - oneYearAgo);
	const basePopularity = Math.random() ** 1.5; // Skew toward lower popularity
	const trendFactor = (Math.random() - 0.5) * 0.8; // -0.4 to 0.4

	const image: Image = {
		key: `${nanoid(12)}.webp`,
		introducedAt: introDate,
		basePopularity,
		trendFactor,
	};

	// 10% chance of having a viral spike
	if (Math.random() < 0.1) {
		image.viralPeak = introDate + Math.random() * (now - introDate);
	}

	images.push(image);
}

console.log("Seeding database with fake data (1 year)...");

// Seed all three tables
const hourlyStmt = db.prepare(`
  INSERT INTO image_stats (image_key, bucket_hour, hits)
  VALUES (?1, ?2, ?3)
  ON CONFLICT(image_key, bucket_hour) DO UPDATE SET hits = hits + ?3
`);

const dailyStmt = db.prepare(`
  INSERT INTO image_stats_daily (image_key, bucket_day, hits)
  VALUES (?1, ?2, ?3)
  ON CONFLICT(image_key, bucket_day) DO UPDATE SET hits = hits + ?3
`);

console.log("Seeding hourly and daily data (1 year ago to 24 hours ago)...");
let _totalHourlyHits = 0;
let _totalDailyHits = 0;

for (let timestamp = oneYearAgo; timestamp < oneDayAgo; timestamp += 3600) {
	const bucketHour = timestamp - (timestamp % 3600);
	const bucketDay = timestamp - (timestamp % 86400);

	// Time-based factors
	const date = new Date(timestamp * 1000);
	const dayOfWeek = date.getUTCDay();
	const hour = date.getUTCHours();
	const month = date.getUTCMonth();

	// Weekly pattern (weekdays busier)
	const isWeekend = dayOfWeek === 0 || dayOfWeek === 6;
	const weekdayMultiplier = isWeekend ? 0.6 : 1.0;

	// Daily pattern (business hours busier, with some randomness)
	const isBusinessHours = hour >= 9 && hour <= 17;
	const hourMultiplier = isBusinessHours
		? 1.2 + Math.random() * 0.4 // 1.2-1.6
		: 0.4 + Math.random() * 0.3; // 0.4-0.7

	// Seasonal pattern (summer busier)
	const isSummer = month >= 5 && month <= 8; // June-Sept
	const seasonalMultiplier = isSummer ? 1.3 : 0.9;

	// Overall growth trend (traffic increases over time)
	const timeProgress = (timestamp - oneYearAgo) / (now - oneYearAgo);
	const growthMultiplier = 0.7 + timeProgress * 0.6; // 0.7 to 1.3

	// Random noise to break perfect cycles
	const noiseMultiplier = 0.85 + Math.random() * 0.3; // 0.85-1.15

	const baseActivity =
		0.25 *
		weekdayMultiplier *
		hourMultiplier *
		seasonalMultiplier *
		growthMultiplier *
		noiseMultiplier;

	for (const image of images) {
		// Skip if image doesn't exist yet
		if (timestamp < image.introducedAt) continue;

		// Calculate image-specific popularity at this time
		const timeSinceIntro = timestamp - image.introducedAt;
		const ageInDays = timeSinceIntro / 86400;

		// Popularity changes over time (trend factor)
		const trendProgress = Math.min(ageInDays / 180, 1); // Over 6 months
		const trendedPopularity =
			image.basePopularity + image.trendFactor * trendProgress;

		// Viral spike (if any)
		let viralBoost = 1;
		if (image.viralPeak) {
			const distanceFromPeak = Math.abs(timestamp - image.viralPeak);
			const peakWindow = 7 * 86400; // 7 day spike
			if (distanceFromPeak < peakWindow) {
				viralBoost = 1 + 5 * (1 - distanceFromPeak / peakWindow); // Up to 6x boost
			}
		}

		// New images get a temporary boost
		const newImageBoost = ageInDays < 3 ? 1 + (3 - ageInDays) * 0.5 : 1;

		const finalPopularity = trendedPopularity * viralBoost * newImageBoost;

		if (Math.random() < baseActivity * finalPopularity) {
			// Power law distribution for hit counts (most hits are small, some are large)
			const hits = Math.max(1, Math.floor(Math.random() ** 3 * 200));
			hourlyStmt.run(image.key, bucketHour, hits);
			dailyStmt.run(image.key, bucketDay, hits);
			_totalHourlyHits += hits;
			_totalDailyHits += hits;
		}
	}

	// Progress indicator every 30 days
	if ((timestamp - oneYearAgo) % (30 * 86400) === 0) {
		const daysProcessed = Math.floor((timestamp - oneYearAgo) / 86400);
		console.log(`  Processed ${daysProcessed} days...`);
	}
}

// Seed 10-minute data for last 24 hours
const tenMinStmt = db.prepare(`
  INSERT INTO image_stats_10min (image_key, bucket_10min, hits)
  VALUES (?1, ?2, ?3)
  ON CONFLICT(image_key, bucket_10min) DO UPDATE SET hits = hits + ?3
`);

console.log("Seeding 10-minute, hourly, and daily data (last 24 hours)...");
let _total10MinHits = 0;

for (let timestamp = oneDayAgo; timestamp <= now; timestamp += 600) {
	const bucket10Min = timestamp - (timestamp % 600);
	const bucketHour = timestamp - (timestamp % 3600);
	const bucketDay = timestamp - (timestamp % 86400);

	// Recent data gets slightly higher activity
	const recency = (timestamp - oneDayAgo) / (now - oneDayAgo);
	const date = new Date(timestamp * 1000);
	const dayOfWeek = date.getUTCDay();
	const hour = date.getUTCHours();

	const isWeekend = dayOfWeek === 0 || dayOfWeek === 6;
	const weekdayMultiplier = isWeekend ? 0.6 : 1.0;

	const isBusinessHours = hour >= 9 && hour <= 17;
	const hourMultiplier = isBusinessHours
		? 1.3 + Math.random() * 0.4
		: 0.5 + Math.random() * 0.3;

	const noiseMultiplier = 0.85 + Math.random() * 0.3;

	const baseActivity =
		0.35 *
		(1 + recency * 0.3) *
		weekdayMultiplier *
		hourMultiplier *
		noiseMultiplier;

	for (const image of images) {
		if (timestamp < image.introducedAt) continue;

		const timeSinceIntro = timestamp - image.introducedAt;
		const ageInDays = timeSinceIntro / 86400;
		const trendProgress = Math.min(ageInDays / 180, 1);
		const trendedPopularity =
			image.basePopularity + image.trendFactor * trendProgress;

		let viralBoost = 1;
		if (image.viralPeak) {
			const distanceFromPeak = Math.abs(timestamp - image.viralPeak);
			const peakWindow = 7 * 86400;
			if (distanceFromPeak < peakWindow) {
				viralBoost = 1 + 5 * (1 - distanceFromPeak / peakWindow);
			}
		}

		const newImageBoost = ageInDays < 3 ? 1 + (3 - ageInDays) * 0.5 : 1;
		const finalPopularity = trendedPopularity * viralBoost * newImageBoost;

		if (Math.random() < baseActivity * finalPopularity) {
			const hits = Math.max(1, Math.floor(Math.random() ** 3 * 100));
			tenMinStmt.run(image.key, bucket10Min, hits);
			hourlyStmt.run(image.key, bucketHour, hits);
			dailyStmt.run(image.key, bucketDay, hits);
			_total10MinHits += hits;
		}
	}
}

// Get summary stats
const totalHitsHourly = db
	.prepare(`SELECT SUM(hits) as total FROM image_stats`)
	.get() as { total: number };
const totalHitsDaily = db
	.prepare(`SELECT SUM(hits) as total FROM image_stats_daily`)
	.get() as { total: number };
const totalHits10Min = db
	.prepare(`SELECT SUM(hits) as total FROM image_stats_10min`)
	.get() as { total: number };
const uniqueImages = db
	.prepare(`
  SELECT COUNT(DISTINCT image_key) as count FROM (
    SELECT image_key FROM image_stats
    UNION
    SELECT image_key FROM image_stats_10min
    UNION
    SELECT image_key FROM image_stats_daily
  )
`)
	.get() as { count: number };
const hourBuckets = db
	.prepare(`SELECT COUNT(*) as count FROM image_stats`)
	.get() as { count: number };
const dayBuckets = db
	.prepare(`SELECT COUNT(*) as count FROM image_stats_daily`)
	.get() as { count: number };
const tenMinBuckets = db
	.prepare(`SELECT COUNT(*) as count FROM image_stats_10min`)
	.get() as { count: number };
const oldestHit = db
	.prepare(`SELECT MIN(bucket_hour) as min FROM image_stats`)
	.get() as { min: number };
const newestHit = db
	.prepare(`SELECT MAX(bucket_hour) as max FROM image_stats`)
	.get() as { max: number };

console.log("\nSeeding complete!");
console.log(`- Total hits (hourly): ${totalHitsHourly.total.toLocaleString()}`);
console.log(`- Total hits (daily): ${totalHitsDaily.total.toLocaleString()}`);
console.log(`- Total hits (10-min): ${totalHits10Min.total.toLocaleString()}`);
console.log(`- Unique images: ${uniqueImages.count}`);
console.log(`- Hourly buckets: ${hourBuckets.count.toLocaleString()}`);
console.log(`- Daily buckets: ${dayBuckets.count.toLocaleString()}`);
console.log(`- 10-minute buckets: ${tenMinBuckets.count.toLocaleString()}`);
console.log(
	`- Time range: ${new Date(oldestHit.min * 1000).toISOString()} to ${new Date(newestHit.max * 1000).toISOString()}`,
);
console.log(
	`- Days of data: ${Math.floor((newestHit.max - oldestHit.min) / 86400)}`,
);