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# Implementation Plan: Timeline Feature
## Phase 1: Database Layer (Store)
**Goal:** Enable fetching data by date range.
1. **Update Interface:** Modify `internal/store/store.go` to add:
* `GetTasksByDateRange(start, end time.Time) ([]models.Task, error)`
* `GetMealsByDateRange(start, end time.Time) ([]models.Meal, error)`
* `GetCardsByDateRange(start, end time.Time) ([]models.Card, error)`
2. **Update Implementation:** Modify `internal/store/sqlite.go` to implement these methods using SQL queries.
3. **Test:** Create/Update `internal/store/store_test.go` to verify the queries work correctly.
## Phase 2: Core Logic & Models
**Goal:** Aggregate and normalize data into a timeline structure.
1. **Create Models:** Create `internal/models/timeline.go` with `TimelineItem` and `TimelineItemType`.
2. **Create Logic:** Create `internal/handlers/timeline_logic.go`.
* Implement `BuildTimeline(store Store, calendarClient *api.GoogleCalendarClient, start, end time.Time)`.
* **Logic:**
* Fetch Tasks, Meals, Cards from Store.
* Fetch Events from Calendar Client.
* Convert all to `TimelineItem`.
* **Apply Meal Defaults:**
* If `MealType` == "breakfast" -> Set time to 08:00
* If `MealType` == "lunch" -> Set time to 12:00
* If `MealType` == "dinner" -> Set time to 19:00
* Else -> Set time to 12:00
* Sort items by `Time`.
3. **Test:** Create `internal/handlers/timeline_logic_test.go` to test merging and sorting (TDD).
## Phase 3: HTTP Handler & Routing
**Goal:** Expose the timeline via HTTP.
1. **Create Handler:** Create `internal/handlers/timeline.go`.
* Inject `Store` and `GoogleCalendarClient`.
* Parse query params (`start`, `days`).
* Call `BuildTimeline`.
* Render template.
2. **Register Route:** Update `cmd/dashboard/main.go` to map `/timeline` to the new handler.
## Phase 4: UI
**Goal:** Visualize the timeline.
1. **Create Template:** Create `web/templates/partials/timeline-tab.html`.
* Iterate over items grouped by day.
* Show time, icon, title, and details.
2. **Update Main View:** Update `web/templates/index.html` to add the "Timeline" tab and HTMX trigger.
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