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nexus/.planning/phases/42-wallpapers-social-format-conversion-voice/42-02-SUMMARY.md

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phase: 42-wallpapers-social-format-conversion-voice plan: 02 subsystem: api tags: [sharp, svg, llm, puter-inference, wallpaper, social-post, hashtags, carousel, renderers, typescript]

Dependency graph

requires:

  • phase: 42-wallpapers-social-format-conversion-voice plan: 01 provides: WallpaperBundle, AppIconBundle, SocialPostBundle types in types.ts; stub wallpaper-renderer.ts and social-renderer.ts
  • phase: 41-diagrams-icons-theme-engine provides: puterChatComplete helper, icon-renderer.ts as implementation reference, sharp rasterization patterns provides:
  • renderWallpaper function + PLATFORM_DIMENSIONS constant in wallpaper-renderer.ts
  • renderSocialPost function + PLATFORM_CHAR_LIMITS constant in social-renderer.ts
  • LLM SVG generation via puterChatComplete with system prompt enforcing exact viewBox dimensions
  • Sharp rasterization at exact platform dimensions with density: 300
  • Multi-size app icon bundle (1024/512/256/64/32px)
  • Instagram carousel with per-slide character limits and hashtag suggestions affects:
  • 42-05 (UI panels for wallpaper and social-post depend on these renderers)
  • 42-06 (UI wiring connects job runner to rendered results)

Tech tracking

tech-stack: added: [] patterns: - "System prompt + user message pattern for LLM: role:system with exact output instructions, role:user with creative prompt" - "density: 300 when loading SVG into sharp — prevents blur at large wallpaper dimensions (pitfall from research)" - "Robust markdown fence stripping: /json([\s\S]*?)/ with fallback to bare /({[\s\S]*})/ extraction" - "Conditional bundle type: same renderer returns AppIconBundle for app-icon/favicon, WallpaperBundle for all other platforms"

key-files: created: [] modified: - server/src/services/renderers/wallpaper-renderer.ts - server/src/services/renderers/social-renderer.ts

key-decisions:

  • "PLATFORM_DIMENSIONS exported as named constant (not magic numbers) — all 12 platforms in one lookup table"
  • "APP_ICON_SIZES = [1024, 512, 256, 64, 32] as const — multi-size bundle returned when platform is app-icon or favicon"
  • "PLATFORM_CHAR_LIMITS exported as named constant — 4 platforms: twitter-x(280), linkedin(3000), instagram-caption(2200), instagram-carousel(300)"
  • "Carousel uses slides[] in SocialPostBundle; all other platforms omit slides field (spread operator conditional)"

patterns-established:

  • "PLATFORM_DIMENSIONS lookup pattern: look up dimensions at render time, throw with available-keys list if not found"
  • "Instagram carousel detection: platform === 'instagram-carousel' switches system prompt to request slides array"
  • "LLM JSON parse: try direct regex extraction before full JSON.parse — handles both fenced and bare object responses"

requirements-completed: [WALL-01, WALL-02, WALL-03, WALL-04, SOCIAL-01, SOCIAL-02, SOCIAL-03]

Metrics

duration: 5min completed: 2026-04-04

Phase 42 Plan 02: Wallpaper Renderer and Social Post Renderer

LLM SVG wallpaper generation rasterized via sharp at 12 platform dimensions, plus platform-aware social post JSON renderer with hashtags and Instagram carousel support

Performance

  • Duration: ~5 min
  • Started: 2026-04-04T22:11:00Z
  • Completed: 2026-04-04T22:14:15Z
  • Tasks: 2
  • Files modified: 2

Accomplishments

  • Replaced wallpaper-renderer.ts stub with full implementation: PLATFORM_DIMENSIONS constant (12 platforms), APP_ICON_SIZES (5 sizes), LLM SVG generation via puterChatComplete with system prompt, sharp rasterization at density: 300
  • App icon/favicon path returns AppIconBundle with 5-size array; all other platforms return WallpaperBundle with single PNG
  • Replaced social-renderer.ts stub with full implementation: PLATFORM_CHAR_LIMITS constant (4 platforms), LLM JSON generation, robust markdown fence stripping, Instagram carousel with slides array
  • TypeScript compiles cleanly with zero errors across both files

Task Commits

Each task was committed atomically:

  1. Task 1: Implement wallpaper renderer with PLATFORM_DIMENSIONS - f0a3666a (feat)
  2. Task 2: Implement social post renderer with hashtags and carousel - 9e39a9ef (feat)

Plan metadata: (docs commit — see below)

Files Created/Modified

  • server/src/services/renderers/wallpaper-renderer.ts - Full implementation replacing stub: PLATFORM_DIMENSIONS, APP_ICON_SIZES, renderWallpaper with LLM SVG + sharp rasterization
  • server/src/services/renderers/social-renderer.ts - Full implementation replacing stub: PLATFORM_CHAR_LIMITS, renderSocialPost with LLM JSON + hashtags/carousel

Decisions Made

  • Removed a dead raw variable (unused first LLM call) that was accidentally left in during writing — cleaned before commit as Rule 1 (bug: unnecessary extra LLM call that's discarded)
  • Chose spread operator conditional ...(parsed.slides !== undefined ? { slides: parsed.slides } : {}) for optional slides field — keeps SocialPostBundle type correct without slides: undefined in JSON output

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Removed dead LLM call in wallpaper-renderer

  • Found during: Task 1 (review before commit)
  • Issue: Initial draft had an unused const raw = await puterChatComplete(...) call that was discarded — an unnecessary extra API call
  • Fix: Removed the dead generateWallpaperSvg helper function entirely; the single puterChatComplete call in renderWallpaper is sufficient
  • Files modified: server/src/services/renderers/wallpaper-renderer.ts
  • Verification: tsc --noEmit passes; logic unchanged
  • Committed in: f0a3666a (part of Task 1 commit)

Total deviations: 1 auto-fixed (1 bug) Impact on plan: Removed dead code before commit. No scope creep.

Issues Encountered

None.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

  • wallpaper-renderer.ts and social-renderer.ts fully implemented; Plans 42-05 (UI panels) and 42-06 (UI wiring) can proceed
  • PLATFORM_DIMENSIONS and PLATFORM_CHAR_LIMITS are exported constants ready for UI import
  • Plans 42-03 (convert renderer) and 42-04 (voice) are independent and can proceed in parallel

Self-Check: PASSED

  • server/src/services/renderers/wallpaper-renderer.ts — FOUND
  • server/src/services/renderers/social-renderer.ts — FOUND
  • Commit f0a3666a — FOUND
  • Commit 9e39a9ef — FOUND

Phase: 42-wallpapers-social-format-conversion-voice Completed: 2026-04-04