package src

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

func TestWriteFileAtomic(t *testing.T) {
	dir := t.TempDir()
	file := filepath.Join(dir, "settings.json")

	if err := writeFileAtomic(file, []byte("first"), 0644); err != nil {
		t.Fatal(err)
	}
	if err := writeFileAtomic(file, []byte("second"), 0600); err != nil {
		t.Fatal(err)
	}

	got, err := os.ReadFile(file)
	if err != nil {
		t.Fatal(err)
	}
	if string(got) != "second" {
		t.Errorf("content = %q, want %q", got, "second")
	}

	fi, err := os.Stat(file)
	if err != nil {
		t.Fatal(err)
	}
	if fi.Mode().Perm() != 0600 {
		t.Errorf("mode = %o, want 0600", fi.Mode().Perm())
	}

	entries, err := os.ReadDir(dir)
	if err != nil {
		t.Fatal(err)
	}
	for _, e := range entries {
		if e.Name() != "settings.json" {
			t.Errorf("unexpected leftover file %q", e.Name())
		}
	}
}

func TestWriteFileAtomicMissingDir(t *testing.T) {
	file := filepath.Join(t.TempDir(), "missing", "settings.json")
	if err := writeFileAtomic(file, []byte("x"), 0644); err == nil {
		t.Fatal("expected an error for a missing directory")
	}
}

func TestRemoveStrings(t *testing.T) {
	list := []string{"a.xml", "b.xml", "c.xml", "d.xml"}
	got := removeStrings(list, map[string]bool{"b.xml": true, "d.xml": true})
	want := []string{"a.xml", "c.xml"}
	if !reflect.DeepEqual(got, want) {
		t.Errorf("removeStrings = %v, want %v", got, want)
	}

	// Nothing to remove: same content, original untouched.
	got = removeStrings(list, nil)
	if !reflect.DeepEqual(got, list) {
		t.Errorf("removeStrings(nil) = %v, want %v", got, list)
	}
}

func TestToFloat64(t *testing.T) {
	cases := []struct {
		in   any
		want float64
	}{
		{float64(3), 3},
		{int(2), 2},
		{int64(1), 1},
		{"x", 0},
		{nil, 0},
	}
	for _, c := range cases {
		if got := toFloat64(c.in); got != c.want {
			t.Errorf("toFloat64(%v) = %v, want %v", c.in, got, c.want)
		}
	}
}