package command

import (
	"Watchdog_Linux-systemd/monitor"
	"Watchdog_Linux-systemd/postLog"
	"fmt"
	"strings"
	"os"
)

func getTextMiddle(text, left, right string) string {
	start := 0
	if left != "" {
		idx := strings.Index(text, left)
		if idx == -1 {
			return ""
		}
		start = idx + len(left)
	}

	if right == "" {
		if start > len(text) {
			return ""
		}
		return text[start:]
	}

	endIdx := strings.Index(text[start:], right)
	if endIdx == -1 {
		return ""
	}
	return text[start : start+endIdx]
}

func getCommand(content string) string {
	return getTextMiddle(content, "[", "]")
}

func getContent(content, cmdType string) string {
	return getTextMiddle(content, "<" + cmdType + ">", "</" + cmdType + ">")
}

func ExecuteCommand(input string) error {
	cmdType := getCommand(input)
	switch cmdType {
	case "monitor.add":
		serviceName := getContent(input, "serviceName")
		postLog.Info(fmt.Sprintf("Add service monitor: %s", serviceName))
		if len(serviceName) != 0 {
			err := monitor.AddServiceMonitor(serviceName)
			if err != nil {
				return fmt.Errorf("failed to add service monitor: %v", err)
			}
		}
	case "monitor.remove":
		serviceName := getContent(input, "serviceName")
		postLog.Info(fmt.Sprintf("Remove service monitor: %s", serviceName))
		if len(serviceName) != 0 {
			err := monitor.RemoveServiceMonitor(serviceName)
			if err != nil {
				return fmt.Errorf("failed to remove service monitor: %v", err)
			}
		}
	case "watchdog.shutdown":
		os.Exit(0)
	}
	return fmt.Errorf("unknown command")
}