Zauberwald/.planning/phases/02-gemini-integration-asset-pipeline/02-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
02-gemini-integration-asset-pipeline	01	api	gemini rest-api fetch indexeddb rate-limiting config-loader	phase provides 01-grundgeruest-tippmechanik IndexedDB wrapper (openDB, getSettings, saveSettings) and Settings type	GeminiConfig interface and loadConfig() with caching generateText() with 3x exponential backoff retry generateImage() with reference image support as base64 inlineData checkRateLimit() and incrementApiCall() for daily API call tracking Extended Settings type with apiCallsToday and lastApiCallDate	02-02 02-03 02-04 02-05 asset-pipeline companion-system forest-rewards	added patterns gemini-rest-client exponential-backoff-retry config-caching rate-limit-via-settings-store	created modified src/api/config.ts src/api/config.test.ts src/api/gemini.ts src/api/gemini.test.ts src/types.ts src/storage/db.test.ts	Rate limiting stored in Settings singleton via getSettings/saveSettings (no new store) Image generation has no retry (too expensive), text generation retries 3x with [1s, 2s, 4s] backoff Config loader caches after first successful fetch, resetConfigCache() for testing loadConfigFromObject() provided for Node.js build script usage	Gemini REST pattern: POST to v1beta/models/{model}:generateContent with key param Null-return pattern: all API functions return null on failure, callers use fallback Daily reset pattern: compare lastApiCallDate to today, reset counters if different	GAPI-01 GAPI-02 GAPI-03 GAPI-06	3min	2026-03-29

Phase 02 Plan 01: Config Loader & Gemini API Client Summary

Isomorphic Gemini REST client with config caching, text/image generation, exponential backoff retry, and per-day rate limiting via IndexedDB Settings store

Performance

• Duration: 3 min
• Started: 2026-03-29T09:52:49Z
• Completed: 2026-03-29T09:56:41Z
• Tasks: 1 (TDD: RED + GREEN)
• Files modified: 6

Accomplishments

• Config loader fetches and caches public/config.json with typed GeminiConfig interface
• generateText sends correct Gemini REST request with systemInstruction, retries 3x on failure with exponential backoff [1s, 2s, 4s]
• generateImage converts reference Blobs to base64 inlineData parts, sets responseModalities: ["IMAGE"]
• Rate limiting tracks text/image API calls per day in Settings store with automatic daily reset
• 18 tests across config.test.ts and gemini.test.ts, all passing (55 total project tests)

Task Commits

Each task was committed atomically:

1. Task 1 (RED): Failing tests - b31b9fd (test)
2. Task 1 (GREEN): Implementation - 2bea324 (feat)

TDD task with RED (failing tests) and GREEN (implementation) commits.

Files Created/Modified

• src/api/config.ts - GeminiConfig interface, loadConfig() with caching, resetConfigCache()
• src/api/config.test.ts - 6 tests for config loader (fetch, errors, caching)
• src/api/gemini.ts - generateText(), generateImage(), checkRateLimit(), incrementApiCall()
• src/api/gemini.test.ts - 12 tests for text/image generation and rate limiting
• src/types.ts - Extended Settings with apiCallsToday and lastApiCallDate
• src/storage/db.test.ts - Updated Settings test fixture with new fields

Decisions Made

• Rate limiting stored in existing Settings singleton (no new IndexedDB store needed)
• Image generation has no retry logic (too expensive per plan spec), only text retries
• Config loader includes loadConfigFromObject() for future Node.js build script usage
• Blob-to-base64 conversion uses arrayBuffer + manual binary encoding (no FileReader needed)

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Fixed TypeScript strict null errors in array indexing

• Found during: Task 1 GREEN phase
• Issue: TypeScript strict mode flagged RETRY_DELAYS[attempt] and split("T")[0] as possibly undefined
• Fix: Added nullish coalescing fallbacks (e.g., ?? 1000, ?? "")
• Files modified: src/api/gemini.ts, src/api/gemini.test.ts
• Verification: npx tsc --noEmit passes for all api/ files
• Committed in: 2bea324

2. [Rule 1 - Bug] Updated db.test.ts Settings fixture for extended type

• Found during: Task 1 GREEN phase
• Issue: Existing db.test.ts Settings object missing new apiCallsToday and lastApiCallDate fields
• Fix: Added missing fields to test fixture
• Files modified: src/storage/db.test.ts
• Verification: All 55 tests pass
• Committed in: 2bea324

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Total deviations: 2 auto-fixed (2 bugs) Impact on plan: Both fixes required for type safety and test correctness. No scope creep.

Issues Encountered

• Pre-existing TypeScript errors in src/companion/fallbacks.ts (not caused by this plan, out of scope)

Known Stubs

None - all functions are fully implemented with real logic.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Gemini API client ready for use by prompt templates (02-02), image pipeline (02-03), and companion dialog (02-04)
• Config must exist at public/config.json with geminiApiKey, geminiModel, imageModel fields
• No blockers for subsequent plans

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Phase: 02-gemini-integration-asset-pipeline Completed: 2026-03-29