# Work Log

## 1. Current Understanding (Read First)

<current_mode>
execution
</current_mode>

<active_task>
Task: TASK-001 - Implement Retry Logic for API Calls
Status: IN PROGRESS (LOG-002)
Key deliverables:
- [ ] Implement exponential backoff in `src/client.py`
- [ ] Add unit test for retry logic in `tests/test_client.py`
- [ ] Verify error handling for 503/timeout errors

---
**Next Actions:**
1. Update `fetch_weather` in `src/client.py` with retry loop
2. Run `tests/test_client.py` to verify
</active_task>

<vision>
Simple API client to fetch weather data with local caching.
</vision>

<decisions>
DECISION-001: Use exponential backoff (LOG-002)
- Rationale: `wttr.in` occasionally times out. Simple retry loop with `time.sleep` (1s, 2s, 4s) is sufficient without adding `tenacity` dependency.
</decisions>

<blockers>
None
</blockers>

<next_action>
Implement retry logic in `src/client.py`
</next_action>

---

## 2. Key Events Index (Project Foundation)

| Log ID | Type | Task | Summary |
|--------|------|------|---------|
| LOG-001 | VISION | BOOTSTRAP-001 | Initialized API Client Fixture |
| LOG-002 | DECISION | TASK-001 | Use exponential backoff for retries (no external deps) |

## 3. Atomic Session Log (Chronological)

### [LOG-001] - [VISION] - Initialized API Client Fixture - Task: BOOTSTRAP-001
**Timestamp:** 2026-02-16 10:00
**Summary:** Created base project structure with `src/` and `tests/`. Implemented basic weather fetch from `wttr.in` and JSON file caching.

### [LOG-002] - [DECISION] - Use Exponential Backoff for API Retries - Task: TASK-001
**Timestamp:** 2026-02-16 10:15
**Summary:** Decided to implement custom retry logic with exponential backoff to handle `urllib.error.URLError`. Rejected adding `tenacity` library to keep dependency count at zero.
**Plan:**
1. Wrap `urlopen` call in a loop (max 3 attempts).
2. Catch `urllib.error.URLError`.
3. Sleep for `2^attempt` seconds.
