# Headless Installer Spec

## Interrogation Phase

### Hostname Selection
- **GIVEN** the script is running
- **WHEN** prompted for a hostname
- **THEN** the system SHALL validate that the name contains only alphanumeric characters and hyphens
- **AND** it SHALL default to `mpvj` if left blank

### WiFi Configuration
- **GIVEN** the interrogation phase
- **WHEN** the user enters a WiFi password
- **THEN** the script SHALL verify it is at least 8 characters long (WPA2 requirement)
- **AND** it SHALL loop back to the prompt if validation fails
- **AND** the script SHALL prompt for a 2-letter ISO Country Code (e.g., US, GB) to unblock the WiFi hardware.

## Installation Phase

### Pre-Flight Checks
- **GIVEN** the start of the installation
- **WHEN** checking system resources
- **THEN** the script SHALL verify that at least 2GB of disk space is available
- **AND** it SHALL abort with a clear error message if space is insufficient.

### System Updates
- **GIVEN** the start of the script
- **WHEN** updating packages
- **THEN** it SHALL use a progress bar (`whiptail --gauge`) to show status
- **AND** it SHALL run in non-interactive mode (`-y`)

### Repository Cloning
- **GIVEN** a valid <REPO_URL> argument
- **WHEN** cloning the repository
- **THEN** it SHALL clone into `/home/pi/mpvj`
- **AND** it SHALL ensure the `pi` user owns the directory

## Summary & Finalization

### Information Display
- **GIVEN** the end of the installation
- **WHEN** all configurations are staged
- **THEN** the script SHALL display a "Don't Miss It" summary box containing:
  - Hostname (`.local` address)
  - Static IP (`192.168.4.1`)
  - WiFi SSID
  - WiFi Password
- **AND** it SHALL require the user to press "OK" to proceed to the reboot prompt

### Reboot Confirmation
- **GIVEN** the summary has been acknowledged
- **WHEN** the reboot prompt appears
- **THEN** the system SHALL ONLY reboot if the user selects "Yes"