package data

import (
	"embed"
	"encoding/json"
	"image"
	"log"
	"path"
	"path/filepath"
	"strings"
)

// FS is our exported FS.
//
//go:embed images/* mapping.json
var fs embed.FS

var Images map[string]image.Image
var Mapping map[string][]string
var Tiles []string

func Init() {
	Images = make(map[string]image.Image)
	dir, err := fs.ReadDir("images")
	if err != nil {
		log.Fatal(err)
	}
	for _, e := range dir {
		if !e.IsDir() {
			ext := filepath.Ext(e.Name())
			name := strings.TrimSuffix(e.Name(), ext)
			f, err := fs.Open(path.Join("images", e.Name()))
			if err != nil {
				log.Println(err)
				continue
			}
			defer f.Close()
			img, _, err := image.Decode(f)
			if err != nil {
				continue
			}
			Images[name] = img
		}
	}
	// Load mapping.
	f, err := fs.Open("mapping.json")
	if err != nil {
		log.Fatal(err)
	}
	d := json.NewDecoder(f)
	err = d.Decode(&Mapping)
	if err != nil {
		log.Fatal(err)
	}

	// Add all types to the common map.
	for k := range Mapping {
		Mapping[""] = append(Mapping[""], k)
	}
}