// SPDX-License-Identifier: GPL-3.0-or-later

package model

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

// sandboxHome points HOME and every XDG_* at a temporary directory, as the
// other tests here do.
func sandboxHome(t *testing.T) string {
	t.Helper()
	h := t.TempDir()
	t.Setenv("HOME", h)
	for _, v := range []string{"XDG_CONFIG_HOME", "XDG_STATE_HOME", "XDG_DATA_HOME", "XDG_CACHE_HOME"} {
		t.Setenv(v, "")
	}
	return h
}

// TestPrefsRoundTrip: what is saved comes back, and the file lands beside
// krino.conf.
func TestPrefsRoundTrip(t *testing.T) {
	h := sandboxHome(t)
	p := DefaultPrefs()
	p.PreviewHeight = 420
	p.Colours = false
	p.SelectAll = false
	if err := p.Save(); err != nil {
		t.Fatal(err)
	}
	if got := LoadPrefs(); got != p {
		t.Errorf("loaded %+v, want %+v", got, p)
	}
	want := filepath.Join(h, ".config", "krino", "gui.json")
	if _, err := os.Stat(want); err != nil {
		t.Errorf("not written to %s: %v", want, err)
	}
}

// TestPrefsWithoutAFile: the first run has no file, and damaged text is not
// worth refusing to open a window over.
func TestPrefsWithoutAFile(t *testing.T) {
	sandboxHome(t)
	if got := LoadPrefs(); got != DefaultPrefs() {
		t.Errorf("with no file: %+v, want the defaults", got)
	}
	if err := os.MkdirAll(filepath.Dir(PrefsFile()), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(PrefsFile(), []byte("{not json"), 0o644); err != nil {
		t.Fatal(err)
	}
	if got := LoadPrefs(); got != DefaultPrefs() {
		t.Errorf("with damaged text: %+v, want the defaults", got)
	}
}

// TestWithDisplayKeepsTheDividers: the Settings window used to compose a
// whole Prefs from its own controls, which wrote the remembered pane
// positions back as zeros - so dragging the dividers and then ticking any
// checkbox in Settings threw the positions away and the next window opened
// at the defaults.
func TestWithDisplayKeepsTheDividers(t *testing.T) {
	p := Prefs{
		PreviewWidth: 640, ListWidth: 800, ListHeight: 300, PreviewHeight: 281,
		Sort: SortName, ShowSize: true, ShowAge: true, ShowRule: true,
		Colours: true, Preview: true, SelectAll: true, Layout: LayoutSide,
	}
	d := p.DisplayOf()
	d.ShowRule = false
	d.Sort = SortSize
	got := p.WithDisplay(d)

	if got.PreviewWidth != 640 || got.ListWidth != 800 || got.ListHeight != 300 {
		t.Errorf("the dividers were disturbed: %+v", got)
	}
	if got.ShowRule || got.Sort != SortSize {
		t.Errorf("the change did not take: %+v", got)
	}
	if !got.ShowSize || !got.ShowAge || !got.Colours || !got.Preview || !got.SelectAll {
		t.Errorf("something else changed: %+v", got)
	}
}