pvzm.net / backend
A Deno-powered backend service for Plants vs. Zombies: MODDED. [Read-only GitHub mirror] docs.pvzm.net
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Update version badge to v0.3.0 and enhance featured sorting logic with diversity penalties

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README.md
··· 1 - # PVZM Backend ![v0.2.2](https://img.shields.io/badge/version-v0.2.2-darklime) 1 + # PVZM Backend ![v0.3.0](https://img.shields.io/badge/version-v0.2.2-darklime) 2 2 3 3 > A Deno-powered backend service for [Plants vs. Zombies: MODDED](https://github.com/roblnet13/pvz). This service provides APIs for uploading, downloading, listing, favoriting, and reporting user-created _I, Zombie_ levels. 4 4
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modules/routes/levels.ts
··· 293 293 const orderDirection = reversedOrder ? "ASC" : "DESC"; 294 294 295 295 let orderClause: string; 296 + let useDiversitySort = false; 296 297 if (sort === "featured") { 297 298 // Check if database has mature engagement data (any level with 100+ plays) 298 299 const maxPlaysResult = dbCtx.db.prepare("SELECT MAX(plays) as max_plays FROM levels").get() as { max_plays: number } | undefined; ··· 302 303 if (hasMatureData) { 303 304 // Balanced approach: recency + quality 304 305 // Recency weight: 1 point per day since epoch, quality: favorites * 100 + plays 305 - orderClause = `featured DESC, (created_at / 86400.0 + favorites * 100 + plays) DESC`; 306 + orderClause = `(created_at / 86400.0 + favorites * 100 + plays) DESC`; 306 307 } else { 307 308 // New database: heavily favor recency with minimal quality impact 308 309 // Recency weight: 1 point per day, quality: favorites * 10 + plays / 10 309 310 // This makes recency ~100x more important than in the mature formula 310 - orderClause = `featured DESC, (created_at / 86400.0 + favorites * 10 + plays / 10.0) DESC`; 311 + orderClause = `(created_at / 86400.0 + favorites * 10 + plays / 10.0) DESC`; 311 312 } 313 + useDiversitySort = true; 312 314 } else { 313 315 const orderColumn = sort === "recent" ? "created_at" : sort === "favorites" ? "favorites" : "plays"; 314 316 orderClause = `${orderColumn} ${orderDirection}, id ${orderDirection}`; ··· 338 340 params.push(version); 339 341 } 340 342 343 + // Featured sort only shows featured levels 344 + if (tokenLevelId === null && sort === "featured") { 345 + filters.push("featured = ?"); 346 + params.push(1); 347 + } 348 + 341 349 let query = `SELECT id, name, author, created_at, sun, is_water, favorites, plays, difficulty, version, featured, featured_at FROM levels`; 342 350 343 351 if (filters.length > 0) { 344 352 query += " WHERE " + filters.join(" AND "); 345 353 } 354 + 355 + // For featured sort with diversity, fetch more results to allow for re-ranking 356 + const shouldApplyDiversity = useDiversitySort && tokenLevelId === null; 357 + const fetchLimit = shouldApplyDiversity ? limit * 3 : limit; 358 + const fetchOffset = shouldApplyDiversity ? offset : offset; 346 359 347 360 query += ` ORDER BY ${orderClause} LIMIT ? OFFSET ?`; 348 - params.push(limit, offset); 361 + params.push(fetchLimit, fetchOffset); 362 + 363 + let levels = dbCtx.db.prepare(query).all(...params); 349 364 350 - const levels = dbCtx.db.prepare(query).all(...params); 365 + // Apply author diversity algorithm for featured sort 366 + if (shouldApplyDiversity && Array.isArray(levels) && levels.length > 0) { 367 + type LevelWithScore = { 368 + id: number; 369 + author: string; 370 + created_at: number; 371 + favorites: number; 372 + plays: number; 373 + featured: number; 374 + score: number; 375 + [key: string]: unknown; 376 + }; 377 + 378 + const authorCounts = new Map<string, number>(); 379 + const maxPlaysResult = dbCtx.db.prepare("SELECT MAX(plays) as max_plays FROM levels").get() as { max_plays: number } | undefined; 380 + const hasMatureData = (maxPlaysResult?.max_plays ?? 0) >= 100; 381 + 382 + // Calculate scores and apply diversity penalties 383 + const levelsWithScores = (levels as LevelWithScore[]).map(level => { 384 + // Calculate base score (same formula as SQL) 385 + let baseScore: number; 386 + if (hasMatureData) { 387 + baseScore = level.created_at / 86400.0 + level.favorites * 100 + level.plays; 388 + } else { 389 + baseScore = level.created_at / 86400.0 + level.favorites * 10 + level.plays / 10.0; 390 + } 391 + 392 + // Apply diversity penalty 393 + const authorCount = authorCounts.get(level.author) || 0; 394 + authorCounts.set(level.author, authorCount + 1); 395 + 396 + // Penalty increases exponentially: 0, -500, -1500, -3500, -7500... 397 + const diversityPenalty = authorCount === 0 ? 0 : -500 * (Math.pow(2, authorCount) - 1); 398 + 399 + return { 400 + ...level, 401 + score: baseScore + diversityPenalty 402 + }; 403 + }); 404 + 405 + // Re-sort by adjusted scores 406 + levelsWithScores.sort((a, b) => b.score - a.score); 407 + 408 + // Take only the requested limit 409 + levels = levelsWithScores.slice(0, limit); 410 + } 351 411 352 412 type LevelRow = { 353 413 id: number;