// 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>.

//go:build linux && cgo

package console

import (
	"encoding/binary"
	"git.stormux.org/storm/fenrir/internal/presentation"
	"git.stormux.org/storm/fenrir/internal/screen"
	"testing"
)

func TestVCSAAttributesUseNativeWordsAndKeepUnicode(t *testing.T) {
	text := make([]byte, 8)
	binary.NativeEndian.PutUint32(text, 'é')
	binary.NativeEndian.PutUint32(text[4:], '界')
	data := []byte{1, 2, 0, 0, 0, 0, 0, 0}
	binary.NativeEndian.PutUint16(data[4:], 0x1741)
	binary.NativeEndian.PutUint16(data[6:], 0x8742)
	snapshot, err := decode_snapshot(2, data, text)
	if err != nil {
		t.Fatal(err)
	}
	if err := decode_attributes(&snapshot, data); err != nil {
		t.Fatal(err)
	}
	if string(snapshot.Cells) != "é界" || snapshot.Attributes[0] != (screen.Attribute{Foreground: screen.ColorIndexed | 7, Background: screen.ColorIndexed | 4}) || snapshot.Attributes[1] != (screen.Attribute{Foreground: screen.ColorIndexed | 7, Background: screen.ColorIndexed, Style: screen.ConsoleHigh}) {
		t.Fatal("attributes corrupted Unicode or cell order", snapshot)
	}
	if got := presentation.Format_attributes(snapshot.Attributes[0], "fenrirFGColor|fenrirBGColor|fenrirBold|fenrirBlink"); got != "light gray|blue||" {
		t.Fatal(got)
	}
	if got := presentation.Format_attributes(snapshot.Attributes[1], "fenrirFGColor|fenrirBGColor|fenrirBold|fenrirBlink"); got != "light gray|black||" {
		t.Fatal(got)
	}
	for _, invalid := range [][]byte{data[:4], data[:7], append(append([]byte{}, data...), 0)} {
		if err := decode_attributes(&snapshot, invalid); err == nil {
			t.Fatal("accepted partial or oversized VCSA", invalid)
		}
	}
}

func TestDecodeUnicodeAndGeometry(t *testing.T) {
	data := make([]byte, 16)
	for index, value := range []uint32{'é', '界', 0, 0x110000} {
		binary.NativeEndian.PutUint32(data[index*4:], value)
	}
	snapshot, err := decode_snapshot(2, []byte{2, 2, 1, 0}, data)
	if err != nil {
		t.Fatal(err)
	}
	if string(snapshot.Cells) != "é界 �" || snapshot.Text(0) != "é界" {
		t.Fatalf("wrong Unicode: %+v", snapshot)
	}
	for _, header := range [][]byte{{}, {0, 2, 0, 0}, {2, 2, 2, 0}, {2, 2, 0, 2}} {
		if _, err := decode_snapshot(1, header, data); err == nil {
			t.Fatalf("accepted invalid header %v", header)
		}
	}
	if _, err := decode_snapshot(1, []byte{2, 2, 0, 0}, data[:12]); err == nil {
		t.Fatal("accepted resize mismatch")
	}
}