// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later

package screen

import "strings"

// Region uses inclusive screen-cell coordinates, independently of text width
// in bytes. ToLineEnd follows the current right edge when the terminal resizes.
// Other coordinates stay fixed and are clipped only while reading/filtering.
type Region struct {
	Left, Top, Right, Bottom int
	ToLineEnd                bool
}

func (r Region) Right_edge(cols int) int {
	if r.ToLineEnd {
		return cols - 1
	}
	return min(r.Right, cols-1)
}

func (r Region) Contains(x, y, cols int) bool {
	return x >= r.Left && x <= r.Right_edge(cols) && y >= r.Top && y <= r.Bottom
}

func (r Region) Text(s Snapshot) string {
	right := r.Right_edge(s.Cols)
	if r.Left > right || r.Top >= s.Rows {
		return ""
	}
	var lines []string
	for row := r.Top; row <= min(r.Bottom, s.Rows-1); row++ {
		lines = append(lines, strings.TrimRight(string(s.Line(row)[r.Left:right+1]), " \x00"))
	}
	return strings.Join(lines, "\n")
}