package main

import (
	"context"
	"fmt"

	"sysmon/backend"
)

// App struct
type App struct {
	ctx context.Context
	sys *backend.SysInfo
}

// NewApp creates a new App application struct
func NewApp() *App {
	return &App{}
}

// startup is called when the app starts. The context is saved
// so we can call the runtime methods
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx
	a.InitBackend(ctx)
}

// Greet returns a greeting for the given name
func (a *App) Greet(name string) string {
	return fmt.Sprintf("Hello %s, It's show time!", name)
}

// Initialise backend SysInfo on startup and expose its methods
func (a *App) InitBackend(ctx context.Context) {
	if ctx == nil {
		ctx = context.Background()
	}
	a.ctx = ctx
	a.sys = backend.NewSysInfo(a.ctx)
}

// GetMetrics proxies to backend.SysInfo.GetMetrics
func (a *App) GetMetrics() (*backend.Metrics, error) {
	if a.sys == nil {
		a.InitBackend(a.ctx)
	}
	return a.sys.GetMetrics()
}

// GetProcessDetail returns all available details for the given PID.
func (a *App) GetProcessDetail(pid int32) (*backend.ProcessDetail, error) {
	return backend.FetchProcessDetail(pid)
}

// KillProcess terminates a process by PID. Set force=true for SIGKILL.
func (a *App) KillProcess(pid int32, force bool) error {
	return backend.KillProcess(pid, force)
}