package main

import (
	"bufio"
	"fmt"
	"log/slog"
	"os"
	"path/filepath"
	"slices"

	"github.com/alexflint/go-arg"
	"github.com/ayyansea/uptfs/internal/config"
	"github.com/ayyansea/uptfs/internal/filter"
	"github.com/ayyansea/uptfs/internal/token"
)

var args struct {
	ConfigFile string `arg:"-c" help:"path to config file" default:""`
	Verbose    bool   `arg:"-v" help:"toggle verbose (debug) mode"`
}

func errExit(err error) {
	fmt.Println(err)
	os.Exit(1)
}

func main() {
	arg.MustParse(&args)

	if args.Verbose {
		slog.SetLogLoggerLevel(slog.LevelDebug)
	}

	slog.Debug("uptfs started")

	var configFilePath string
	var err error

	if args.ConfigFile != "" {
		configFilePath, err = filepath.Abs(args.ConfigFile)
		slog.Debug("config file path: " + configFilePath)
	}
	if err != nil {
		errExit(err)
	}

	var config config.Config
	config.LoadConfig(configFilePath)

	var inputStrings []string
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		inputStrings = append(inputStrings, scanner.Text())
	}

	additionalDelimeters := []string{",", ".", " "}
	var delimeterString string
	for _, element := range additionalDelimeters {
		if element == " " {
			element = "<space>"
		}
		delimeterString = delimeterString + element + " "
	}
	slog.Debug("delimeters: " + delimeterString)

	tempword := ""
	var tokenizedInputSlice []token.LinkedTokenList
	var tokenlist token.LinkedTokenList

	for _, elem := range inputStrings {
		for index, character := range elem {
			slog.Debug("current character: " + string(character))
			if slices.Contains(additionalDelimeters, string(character)) {
				slog.Debug("current character is a delimeter")
				if len(tempword) != 0 {
					slog.Debug("word is longer than 0 characters, filtering it")
					for _, filterName := range config.Filters {
						_, ok := filter.FilterList[filterName]
						if ok {
							slog.Debug("using filter " + filterName)
							currentfilter := filter.FilterList[filterName]()
							tempword = currentfilter.Filter(tempword)
						} else {
							slog.Debug("there's no filter named " + filterName)
							continue
						}
					}
					slog.Debug("filtered word: " + tempword)
					tokenlist.AddToken(tempword)
					slog.Debug("adding delimeter")
					tokenlist.AddToken(string(character))
					slog.Debug("resetting current word to an empty string")
					tempword = ""

					continue
				}
				slog.Debug("current word is a zero-length string")
				slog.Debug("adding delimeter")
				tokenlist.AddToken(string(character))
				tempword = ""

				continue
			}
			slog.Debug("current character is not a delimeter, adding to word")
			tempword = tempword + string(character)
			if index == len(elem)-1 {
				slog.Debug("string ended, filtering current word")
				for _, filterName := range config.Filters {
					_, ok := filter.FilterList[filterName]
					if ok {
						slog.Debug("using filter " + filterName)
						currentfilter := filter.FilterList[filterName]()
						tempword = currentfilter.Filter(tempword)
					} else {
						slog.Debug("there's no filter named " + filterName)
						continue
					}
				}
				slog.Debug("filtered word: " + tempword)
				tokenlist.AddToken(tempword)
				tempword = ""
			}
		}
		tokenizedInputSlice = append(tokenizedInputSlice, tokenlist)
		tokenlist.Clear()
	}

	result := ""

	for _, elem := range tokenizedInputSlice {
		for current := elem.GetHead(); current != nil; current = current.GetNextToken() {
			result = result + current.GetContent()
		}
		fmt.Println(result)
		result = ""
	}

	slog.Debug("uptfs finished")
}