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

package app

import (
	"strings"
	"unicode/utf8"

	"git.stormux.org/storm/cthulhu/internal/atspi"
	"git.stormux.org/storm/cthulhu/internal/braille"
	"git.stormux.org/storm/cthulhu/internal/config"
)

func markTextAttributeRun(frame *braille.Frame, run atspi.TextAttributeRun, sourceStart, frameStart, textLength int, settings config.TextAttributeSettings) {
	if settings.Indicator == 0 || run.End <= run.Start || textLength <= 0 {
		return
	}
	marked := false
	for _, choice := range settings.Choices {
		if !choice.Braille {
			continue
		}
		if choice.Key == "text-spelling" {
			if atspi.TextAttributesMisspelled(run.Values) {
				marked = true
				break
			}
			continue
		}
		value := strings.TrimSpace(run.Values[choice.Key])
		if value == "" {
			continue
		}
		for _, known := range characterAttributeOrder {
			if known.key != choice.Key {
				continue
			}
			if value != known.ignore {
				marked = true
			}
			break
		}
		if marked {
			break
		}
	}
	if !marked {
		return
	}
	begin := max(run.Start, sourceStart)
	end := min(run.End, sourceStart+textLength)
	if begin >= end {
		return
	}
	count := utf8.RuneCountInString(frame.Text)
	if len(frame.Dots) < count {
		frame.Dots = append(frame.Dots, make([]byte, count-len(frame.Dots))...)
	}
	for offset := begin; offset < end; offset++ {
		frame.Dots[frameStart+offset-sourceStart] |= byte(settings.Indicator)
	}
}