// Fenrir console screen reader.
// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

package config

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

func TestDocumentPreservesSectionOrderAndPrivateAtomicSave(t *testing.T) {
	path := filepath.Join(t.TempDir(), "settings.toml")
	if err := os.WriteFile(path, []byte("version=1\n[ 'speech' ]\nrate=40\n[reading]\nautomatic=false\n"), 0644); err != nil {
		t.Fatal(err)
	}
	doc, err := Open_document(path, Defaults())
	if err != nil {
		t.Fatal(err)
	}
	if !reflect.DeepEqual(doc.Order, []string{"presentation", "presentation.speech", "reading"}) {
		t.Fatal(doc.Order)
	}
	settings := doc.Settings
	settings.Presentation.Speech.Rate = 41
	if err := doc.Save(settings); err != nil {
		t.Fatal(err)
	}
	loaded, err := Open_document(path, Defaults())
	if err != nil {
		t.Fatal(err)
	}
	if loaded.Settings.Presentation.Speech.Rate != 41 || !reflect.DeepEqual(loaded.Order, []string{"presentation", "presentation.speech", "presentation.sound", "presentation.progress", "presentation.time_and_date", "reading", "keyboard", "internal_ui", "review", "screen", "clipboard", "general", "scripts", "remote", "prompt"}) {
		t.Fatal(loaded)
	}
	info, err := os.Stat(path)
	if err != nil || info.Mode().Perm() != 0600 {
		t.Fatal(info, err)
	}
	files, err := filepath.Glob(filepath.Join(filepath.Dir(path), ".settings-*"))
	if err != nil || len(files) != 0 {
		t.Fatal(files, err)
	}
}

func TestDocumentRejectsExternalEditsAndInvalidSettings(t *testing.T) {
	for _, mode := range []string{"changed", "created", "invalid"} {
		t.Run(mode, func(t *testing.T) {
			path := filepath.Join(t.TempDir(), "settings.toml")
			if mode != "created" {
				if err := Save(path, Defaults()); err != nil {
					t.Fatal(err)
				}
			}
			doc, err := Open_document(path, Defaults())
			if err != nil {
				t.Fatal(err)
			}
			draft := doc.Settings
			if mode == "invalid" {
				draft.Presentation.Sound.Volume = 2
			} else {
				other := Defaults()
				other.Presentation.Speech.Rate = 3
				if err := Save(path, other); err != nil {
					t.Fatal(err)
				}
			}
			before, err := os.ReadFile(path)
			if err != nil {
				t.Fatal(err)
			}
			if err := doc.Save(draft); err == nil {
				t.Fatal("unsafe save accepted")
			}
			after, err := os.ReadFile(path)
			if err != nil || string(before) != string(after) {
				t.Fatal("failed save changed file", err)
			}
		})
	}
}

func TestDocumentDefaultsAndDottedTables(t *testing.T) {
	path := filepath.Join(t.TempDir(), "settings.toml")
	doc, err := Open_document(path, Defaults())
	if err != nil {
		t.Fatal(err)
	}
	if err := doc.Save(doc.Settings); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, []byte("reading.automatic=false\nspeech = {rate=30}\n"), 0600); err != nil {
		t.Fatal(err)
	}
	doc, err = Open_document(path, Defaults())
	if err != nil || !reflect.DeepEqual(doc.Order, []string{"reading", "presentation", "presentation.speech"}) {
		t.Fatal(doc, err)
	}
	if err := os.WriteFile(path, []byte(strings.Repeat("#", (1<<20)+1)), 0600); err != nil {
		t.Fatal(err)
	}
	if _, err := Open_document(path, Defaults()); err == nil {
		t.Fatal("oversize document accepted")
	}
}