package backend

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

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func newCharacterService(t *testing.T) *CharacterService {
	t.Helper()
	base := t.TempDir()
	writeFile(t, filepath.Join(base, "secret.png"), "outside")
	dir := filepath.Join(base, "characters")
	writeFile(t, filepath.Join(dir, "Adol.png"), "adol")
	writeFile(t, filepath.Join(dir, "Aloy.JPG"), "aloy")
	writeFile(t, filepath.Join(dir, "notes.txt"), "text")
	writeFile(t, filepath.Join(dir, "sub", "Hidden.png"), "hidden")

	c, err := NewCharacterService(dir)
	require.NoError(t, err)
	t.Cleanup(func() { c.Close() })
	return c
}

func TestCharacterList(t *testing.T) {
	characters, err := newCharacterService(t).List()
	require.NoError(t, err)
	assert.Equal(t, []string{"Adol.png", "Aloy.JPG"}, characters)
}

func TestCharacterOpen(t *testing.T) {
	c := newCharacterService(t)

	f, err := c.Open("Adol.png")
	require.NoError(t, err)
	content, _ := io.ReadAll(f)
	f.Close()
	assert.Equal(t, "adol", string(content))

	_, err = c.Open("Missing.png")
	assert.ErrorIs(t, err, ErrNotFound)
}

func TestCharacterOpenRejectsPathTraversal(t *testing.T) {
	c := newCharacterService(t)
	for _, name := range []string{"", "../secret.png", "sub/Hidden.png", "/etc/passwd", "..", "notes.txt"} {
		_, err := c.Open(name)
		assert.ErrorIs(t, err, ErrInvalidName, name)
	}
}

func TestNewCharacterServiceMissingDir(t *testing.T) {
	_, err := NewCharacterService(filepath.Join(t.TempDir(), "missing"))
	assert.Error(t, err)
}