package spell

import (
	"os"
	"path/filepath"
	"testing"
)

func TestLoadPersonalReadsFile(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "dict.txt")
	if err := os.WriteFile(path, []byte("kubernetes\n# a comment\nflexoki\n\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	d := loadT(t)
	d.SetPersonalPath(path)
	if err := d.LoadPersonal(); err != nil {
		t.Fatalf("LoadPersonal: %v", err)
	}
	if !d.Known("kubernetes") {
		t.Error("hand-added word kubernetes not Known after LoadPersonal")
	}
	if !d.Known("Flexoki") {
		t.Error("personal dict should be case-insensitive")
	}
	if d.Known("# a comment") {
		t.Error("comment line should not be a word")
	}
}

func TestLoadPersonalMissingFileIsOK(t *testing.T) {
	d := loadT(t)
	d.SetPersonalPath(filepath.Join(t.TempDir(), "does-not-exist.txt"))
	if err := d.LoadPersonal(); err != nil {
		t.Errorf("LoadPersonal on missing file = %v, want nil", err)
	}
}

func TestAddAppendsAndPersists(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "sub", "dict.txt") // nested dir must be created
	d := loadT(t)
	d.SetPersonalPath(path)

	if d.Known("zzplonk") {
		t.Fatal("precondition: zzplonk should be unknown")
	}
	if err := d.Add("zzplonk"); err != nil {
		t.Fatalf("Add: %v", err)
	}
	if !d.Known("zzplonk") {
		t.Error("word not Known immediately after Add")
	}
	// A fresh Dict loading the same file sees the persisted word.
	d2 := loadT(t)
	d2.SetPersonalPath(path)
	if err := d2.LoadPersonal(); err != nil {
		t.Fatal(err)
	}
	if !d2.Known("zzplonk") {
		t.Error("Add did not persist to dict.txt")
	}
}