devtool

type App struct {
	Stdin     io.Reader
	Stdout    io.Writer
	Stderr    io.Writer
	Resolve   func(context.Context) (Environment, error)
	Database  DatabaseManager
	Ports     PortAllocator
	Processes ProcessManager
	// LANAddress is this machine's address as a phone on the same network
	// sees it.
	LANAddress func(context.Context) (string, error)
}

type DatabaseManager interface {
	Start(context.Context, Environment) error
	RequireRunning(context.Context, Environment) error
	Exists(context.Context, Environment, string) (bool, error)
	Create(context.Context, Environment, string) error
	Clone(context.Context, Environment, string, string) error
	Reset(context.Context, Environment, string) error
	Migrate(context.Context, Environment, string) error
	Rollback(context.Context, Environment, string) error
}

type DockerDatabase struct{}

type Environment struct {
	MainRoot        string
	CurrentRoot     string
	MainDatabase    string
	CurrentDatabase string
	PostgresPort    int
	ProjectName     string
}

type FilePortAllocator struct {
	LockRoot string
}

type OSProcesses struct{}

type PortAllocator interface {
	Acquire(preferred int) (PortLease, error)
}

type PortLease interface {
	Port() int
	Close() error
}

type ProcessManager interface {
	Start(context.Context, Environment, string, int, int) error
	// Mobile starts Expo advertising host, with the app's address field
	// prefilled with installationURL.
	Mobile(ctx context.Context, env Environment, host, installationURL string) error
	E2E(context.Context, Environment, string, int) error
}