// 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 screen describes the visible cells of one terminal session.
package screen

import "strings"

type Snapshot struct {
	Terminal int
	// Generation changes when a terminal replaces its logical screen buffer.
	Generation uint64
	Active     bool
	NumLock    bool
	CapsLock   bool
	Rows, Cols int
	X, Y       int
	Cells      []rune
	// Attributes is either absent or has one entry per cell. Both adapters keep
	// visual changes even when the text and hardware cursor stay unchanged.
	Attributes []Attribute
}

type Attribute struct {
	Foreground, Background uint32
	Style                  uint32
}

func (s Snapshot) Line(row int) []rune {
	return s.Cells[row*s.Cols : (row+1)*s.Cols]
}

func (s Snapshot) Text(row int) string {
	return strings.TrimRight(string(s.Line(row)), " \x00")
}