34-midi (#35)

Closes #34 Implement MIDI peripherals
Implement device concept
Cleaning project

Reviewed-on: #35

hardware/devicesHandler.go

@@ -0,0 +1,72 @@
+package hardware
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"strings"
+
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+)
+
+// DeviceEvent is triggered when a device event changes
+type DeviceEvent string
+
+const (
+	// DeviceArrival is triggered when a device arrival
+	DeviceArrival DeviceEvent = "DEVICE_ARRIVAL"
+	// DeviceRemoval is triggered when a device removal
+	DeviceRemoval EndpointEvent = "DEVICE_REMOVAL"
+)
+
+// MappingInfo is the configuration for each device
+type MappingInfo struct {
+	DeviceInfo struct {
+		Name         string `yaml:"name"`
+		Manufacturer string `yaml:"manufacturer"`
+		Type         string `yaml:"type"`
+	} `yaml:"device"`
+	Features map[string]any `yaml:"features"`
+}
+
+// DeviceInfo represents the device data
+type DeviceInfo struct {
+	SerialNumber string // The device s/n
+	Name         string // The device name
+	Manufacturer string // The device manufacturer
+	Version      string // The device version
+}
+
+// Device represents the logical to be controlled
+type Device struct {
+	DeviceInfo DeviceInfo // The device base information
+	Endpoint   Endpoint   // The device endpoint which control this device
+}
+
+// AddDevice adds a new device to the manager
+func (h *Manager) AddDevice(ctx context.Context, device DeviceInfo, endpoint Endpoint) error {
+	// If the SerialNumber is empty, generate another one
+	if device.SerialNumber == "" {
+		device.SerialNumber = strings.ToUpper(fmt.Sprintf("%08x", rand.Intn(1<<32)))
+	}
+
+	// Add or replace the device to the manager
+	h.devices[device.SerialNumber] = &Device{device, endpoint}
+
+	// Send the event to the front
+	runtime.EventsEmit(ctx, string(DeviceArrival), device)
+	return nil
+}
+
+// RemoveDevice removes a device from the manager
+func (h *Manager) RemoveDevice(ctx context.Context, serialNumber string) error {
+	// Delete the device from the manager
+	if serialNumber == "" {
+		return fmt.Errorf("the device s/n is empty")
+	}
+	delete(h.devices, serialNumber)
+
+	// Send the event to the front
+	runtime.EventsEmit(ctx, string(DeviceRemoval), serialNumber)
+	return nil
+}