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
}