package format

import (
	"io"
	"path/filepath"
	"strings"
	"testing"
)

type fake struct{ name, ext string }

func (f fake) Name() string                      { return f.name }
func (f fake) Match(p string) bool               { return strings.EqualFold(filepath.Ext(p), f.ext) }
func (fake) Metadata(string) (Meta, error)       { return Meta{}, nil }
func (fake) Resize(string, int, io.Writer) error { return nil }
func (fake) Kind() Kind                          { return KindImage }

func TestRegistryFirstMatchWins(t *testing.T) {
	var r Registry
	r.Register(fake{"a", ".jpg"})
	r.Register(fake{"b", ".jpg"})
	r.Register(fake{"c", ".png"})

	if got := r.Lookup("x/IMG.JPG"); got == nil || got.Name() != "a" {
		t.Fatalf("jpg: got %v, want a", got)
	}
	if got := r.Lookup("x.png"); got == nil || got.Name() != "c" {
		t.Fatalf("png: got %v, want c", got)
	}
	if got := r.Lookup("notes.txt"); got != nil {
		t.Fatalf("txt: got %v, want nil", got)
	}
}

func TestHasExt(t *testing.T) {
	exts := []string{".jpg", ".jpeg"}
	for p, want := range map[string]bool{
		"a.jpg": true, "a.JPEG": true, "a.png": false, "jpg": false, "a.jpg.txt": false,
	} {
		if got := hasExt(p, exts); got != want {
			t.Errorf("hasExt(%q) = %v, want %v", p, got, want)
		}
	}
}