update readme to be comprehensive

README.md

@@ -6,8 +6,10 @@ Display random Unsplash photos on an Inky Impression e-paper display, with a web
 
 - Fetches random high-resolution photos from Unsplash (cached to gallery)
 - Upload your own images via the web interface (drag-and-drop, multi-file)
-- Centres and scales images to fit the display resolution
+- Centres, scales, and rotates images to fit the display
 - Colour saturation tuning for e-paper
+- Display orientation — configure the physical mounting direction (0°, 90°, 180°, 270°)
+  — Unsplash orientation filter is auto-derived (portrait/landscape/squarish)
 - Web dashboard with preview, gallery, rotation queue, and config editor
 - MQTT integration for remote commands and status reporting
 - Simulation mode for testing without hardware (configurable resolution)
@@ -43,24 +45,34 @@ The installer will:
 ```bash
 pip install -r requirements.txt
 pip install -e .
+
+# Optional: install dev dependencies for running tests
+pip install -e ".[dev]"
 ```
 
 ## Configuration
 
-Edit `/etc/spectra/config.yaml` (or `~/.config/spectra/config.yaml` or `config.yaml` in the current directory):
+Copy `config.example.yaml` to `config.yaml` and fill in your Unsplash access key.
+spectra searches for `config.yaml` in this order:
+
+1. `$PWD/config.yaml`
+2. `~/.config/spectra/config.yaml`
+3. `/etc/spectra/config.yaml`
+
+Or pass a custom path: `spectra -c /path/to/config.yaml`
 
 ```yaml
 unsplash:
   access_key: "your_access_key_here"
   query: "nature"
-  orientation: "landscape"
   collections: ""
 
 display:
   saturation: 0.5
-  # resolution:
-  #   width: 800
-  #   height: 480
+  orientation: 0       # 0, 90, 180, 270 (degrees clockwise)
+  resolution:
+    width: 1600
+    height: 1200
 
 schedule:
   interval_hours: 1
@@ -79,6 +91,10 @@ paths:
   cache: /var/cache/spectra
 ```
 
+> **Note:** The `unsplash.orientation` key is no longer used. The Unsplash
+> orientation filter (`landscape`/`portrait`/`squarish`) is now derived
+> automatically from `display.orientation` + `display.resolution`.
+
 ## Usage
 
 ### Display loop
@@ -109,7 +125,7 @@ spectra web
 # With custom host/port
 spectra web --host 0.0.0.0 --port 5000
 
-# Verbose logging
+# Verbose logging (debug mode is limited to localhost)
 spectra web -v
 ```
 
@@ -118,7 +134,22 @@ The web interface provides:
 - **Dashboard** — display status, schedule info, quick actions (refresh, clear)
 - **Gallery** — browse all uploaded and cached Unsplash images, trigger "show now"
 - **Upload** — drag-and-drop multiple image files with progress tracking
-- **Settings** — live-edit Unsplash, display, schedule, and MQTT configuration
+- **Settings** — live-edit Unsplash, display (including orientation), schedule, and MQTT configuration
+- **Preview** — preview how an image will look on the display (respects current orientation)
+
+### Display orientation
+
+Set `display.orientation` in config or via Settings > Display > Display Orientation:
+
+| Value | Unsplash filter | Use case                |
+|-------|----------------|-------------------------|
+| 0     | landscape      | Default horizontal mount |
+| 90    | portrait       | Vertical mount           |
+| 180   | landscape      | Upside-down horizontal   |
+| 270   | portrait       | Upside-down vertical     |
+
+Images are cropped to the effective aspect ratio, resized, then rotated to match
+the physical panel. The preview and thumbnails reflect the configured orientation.
 
 ### MQTT
 
@@ -141,11 +172,22 @@ journalctl -u spectra -f
 journalctl -u spectra-web -f
 ```
 
+## Running tests
+
+```bash
+pip install -e ".[dev]"
+pytest tests/
+```
+
+107 tests covering config loading, display processing (crop, resize, rotation),
+trigger atomicity, MQTT parsing, and the full web API (all 19 routes).
+
 ## Project structure
 
 ```
 spectra/
-├── config.yaml              # Example configuration
+├── config.example.yaml       # Example config (copy to config.yaml)
+├── .gitignore                # Ignores config.yaml (contains secrets)
 ├── install.sh                # Installer script
 ├── pyproject.toml            # Package metadata
 ├── requirements.txt          # Python dependencies
@@ -166,10 +208,20 @@ spectra/
 │       ├── templates/        # Jinja2 templates (6 pages)
 │       ├── static/           # CSS and JS
 │       └── __init__.py
+├── tests/
+│   ├── test_api.py           # 42 API endpoint tests
+│   ├── test_config.py        # Config loading and deep-merge
+│   ├── test_display.py       # Display processing and orientation
+│   ├── test_gallery.py       # Upload + delete flow
+│   ├── test_mqtt.py          # MQTT path and lookup
+│   ├── test_orientation.py   # Orientation edge cases
+│   ├── test_trigger.py       # Trigger atomicity
+│   └── conftest.py           # Test fixtures
 ├── systemd/
 │   ├── spectra.service       # Display loop systemd unit
 │   └── spectra-web.service   # Web interface systemd unit
 └── docs/
+    ├── display-orientation.md # Display orientation design doc
     ├── web-interface.md      # Web interface documentation
     └── mqtt.md               # MQTT integration documentation
 ```