package cli

import (
	"bufio"
	"fmt"
	"log"
	"os"
	loadaverage "rpi5-health/internal/load_average"
	"rpi5-health/internal/memory"
	"rpi5-health/internal/processor"
	"rpi5-health/internal/temperature"
	"rpi5-health/internal/uptime"
	"strings"
)

func Listen() {
	reader := bufio.NewScanner(os.Stdin)

	for {

		fmt.Print("\n> ")

		if !reader.Scan() {
			log.Println("Program terminated (SIGINT)")
			return
		}

		if err := reader.Err(); err != nil {
			log.Printf("Console input error: %v\n", err)
			return
		}

		text := strings.TrimSpace(reader.Text())

		switch text {
		case "exit":
			return
		case "help":
			fmt.Print(`
exit 	- Exit the program
meminfo - Print memory information
cpuinfo	- Print cpu information
uptime 	- Print system uptime
loadavg - Print cpu load average information`)
			fmt.Println()
		case "meminfo":
			memInfo, _ := memory.GetRamInformation()

			const GB = 1024 * 1024 * 1024

			fmt.Printf("Total memory: %.2fGB\n", float64(memInfo.SystemMemory)/GB)
			fmt.Printf("Available memory: %.2fGB\n", float64(memInfo.AvailableMemory)/GB)
			fmt.Printf("Used memory: %.2fGB\n", float64(memInfo.GetUsedMemory())/GB)
		case "cpuinfo":
			_, kernel, usage, idle := processor.GetCPUInformation().Usage()

			fmt.Printf("Total time spent idling: %.2f%%\n", idle)
			fmt.Printf("Total time spent in kernel mode: %.2f%%\n", kernel)
			fmt.Printf("Total time spent in user mode: %.2f%%\n", usage)
		case "uptime":
			uptime, _ := uptime.GetUptimeInformation()

			fmt.Printf("Total uptime: %s\n", uptime.FormatSeconds())
		case "loadavg":
			loadAvg, _ := loadaverage.GetLoadAverage()

			fmt.Printf("Load average: L1: %.2f | L5: %.2f | L15: %.2f\n", loadAvg.Load1, loadAvg.Load5, loadAvg.Load15)
		case "temperature":
			temp, _ := temperature.GetTemperatureInformation()

			if temp.Supported {
				fmt.Printf("Current temperature: %.2fC°", temp.Celsius)
			} else {
				fmt.Printf("Temperature reading is unsupported. Try installing Libre Hardware Monitor, or running as Administrator.")
			}
		}
	}

}