package settings

import (
	"os"
	"runtime"
	"strconv"
	"strings"
	"time"
	"velvettear/gosync/help"
	"velvettear/gosync/log"
)

// exported function(s)
func Initialize() {
	var arguments []string
	for index := 1; index < len(os.Args); index++ {
		arg := strings.ToLower(os.Args[index])
		if arg != "-v" && arg != "--verbose" {
			arguments = append(arguments, arg)
			continue
		}
		setVerbose(true)
	}
	var filteredArguments []string
	for index := 0; index < len(arguments); index++ {
		switch arguments[index] {
		case "-h":
			fallthrough
		case "--help":
			help.Print()
			os.Exit(0)
		case "-c":
			fallthrough
		case "--concurrency":
			index++
			if index < len(arguments) {
				concurrency, error := strconv.Atoi(arguments[index])
				if error != nil {
					break
				}
				setConcurrency(concurrency)
			}
		case "-d":
			fallthrough
		case "--delay":
			index++
			if index < len(arguments) {
				delay, error := strconv.Atoi(arguments[index])
				if error != nil {
					break
				}
				setDelay(time.Duration(delay) * time.Millisecond)
			}
		case "-p":
			fallthrough
		case "--password":
			index++
			if index > len(arguments) {
				break
			}
			setPassword(arguments[index])
		case "-u":
			fallthrough
		case "--user":
			index++
			if index > len(arguments) {
				break
			}
			setUser(arguments[index])
		default:
			filteredArguments = append(filteredArguments, arguments[index])
		}
	}
	if len(arguments) < 2 {
		log.Fatal("error: missing arguments")
	}
	setSource(filteredArguments[0])
	setTarget(filteredArguments[1])
	if !SourceIsRemote() {
		source, _ := strings.CutSuffix(Source, "/*")
		_, error := os.Stat(source)
		if os.IsNotExist(error) {
			log.Fatal("given source does not exist", source)
		}
	}
	setDefaults()
}

// unexported function(s)
func setDefaults() {
	if Concurrency == 0 {
		setConcurrency(runtime.NumCPU())
	}
	if Delay == 0 {
		setDelay(100)
	}
}