package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"os"
	"strings"
)

func fileNameWithoutExtension(fileName string) string {
	if pos := strings.LastIndexByte(fileName, '.'); pos != -1 {
		return fileName[:pos]
	}
	return fileName
}

func main() {
	CategoryFlag := flag.String("c", "", "Name of the emoji category")
	flag.Parse()
	// Remove old meta.json
	_, err := os.Stat("meta.json")
	if !os.IsNotExist(err) {
		err = os.Remove("meta.json")
		if err != nil {
			fmt.Println(err)
		}
	}
	// Get files list
	f, err := os.Open("./")
	if err != nil {
		fmt.Println(err)
		return
	}
	files, err := f.Readdir(0)
	if err != nil {
		fmt.Println(err)
		return
	}
	// Init metadata
	meta := &MetaPackage{}
	// Loop through files
	for _, file := range files {
		emoji := Emoji{
			Downloaded: true,
			FileName:   file.Name(),
			Emoji: EmojiInfo{
				Name:     fileNameWithoutExtension(file.Name()),
				Category: *CategoryFlag,
			},
		}
		meta.Emojis = append(meta.Emojis, emoji)
	}
	// Write JSON file
	metaData, _ := json.MarshalIndent(meta, "", " ")
	_ = os.WriteFile("meta.json", metaData, 0644)
}

type MetaPackage struct {
	Emojis []Emoji `json:"emojis"`
}

type Emoji struct {
	Downloaded bool      `json:"downloaded"`
	FileName   string    `json:"fileName"`
	Emoji      EmojiInfo `json:"emoji"`
}
type EmojiInfo struct {
	Name     string `json:"name"`
	Category string `json:"category"`
	// Aliases  []string `json:"aliases"`
}