// Command shadow transliterates text into the Shadow Alphabet.
//
// Usage:
//
//	echo "the cat sat on the mat" | shadow -lang en
//	echo "dobar dan" | shadow -lang hr
//	shadow -lang en -word "church"
//	shadow -lang hr -word "život"
package main

import (
	"bufio"
	"flag"
	"fmt"
	"os"

	"git.mleku.dev/mleku/dendrite/pkg/shadow"
)

func main() {
	lang := flag.String("lang", "en", "source language: en (English), hr (Croatian)")
	word := flag.String("word", "", "single word to transliterate (instead of stdin)")
	flag.Parse()

	switch *lang {
	case "en":
		runEnglish(*word)
	case "hr":
		runCroatian(*word)
	default:
		fmt.Fprintf(os.Stderr, "unknown language: %s (supported: en, hr)\n", *lang)
		os.Exit(1)
	}
}

func runEnglish(word string) {
	dict, err := shadow.LoadEnglishDict()
	if err != nil {
		fmt.Fprintf(os.Stderr, "error loading dictionary: %v\n", err)
		os.Exit(1)
	}

	if word != "" {
		result, ok := dict.Lookup(word)
		if !ok {
			fmt.Fprintf(os.Stderr, "%s: not found in dictionary\n", word)
			os.Exit(1)
		}
		fmt.Println(result)
		return
	}

	sc := bufio.NewScanner(os.Stdin)
	for sc.Scan() {
		line := sc.Text()
		fmt.Println(dict.FromEnglish(line))
	}
	if err := sc.Err(); err != nil {
		fmt.Fprintf(os.Stderr, "read error: %v\n", err)
		os.Exit(1)
	}
}

func runCroatian(word string) {
	if word != "" {
		fmt.Println(shadow.FromCroatian(word))
		return
	}

	sc := bufio.NewScanner(os.Stdin)
	for sc.Scan() {
		fmt.Println(shadow.FromCroatian(sc.Text()))
	}
	if err := sc.Err(); err != nil {
		fmt.Fprintf(os.Stderr, "read error: %v\n", err)
		os.Exit(1)
	}
}

func init() {
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "shadow — transliterate text to the Shadow Alphabet\n\n")
		fmt.Fprintf(os.Stderr, "Usage:\n")
		fmt.Fprintf(os.Stderr, "  echo \"text\" | shadow -lang en\n")
		fmt.Fprintf(os.Stderr, "  shadow -lang hr -word \"život\"\n\n")
		fmt.Fprintf(os.Stderr, "Languages:\n")
		fmt.Fprintf(os.Stderr, "  en  English (uses CMU Pronouncing Dictionary, %s entries)\n",
			"134k+")
		fmt.Fprintf(os.Stderr, "  hr  Croatian (Gaj's Latin, direct phonemic mapping)\n\n")
		fmt.Fprintf(os.Stderr, "Flags:\n")
		flag.PrintDefaults()
	}
}