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

package app

import (
	"fmt"
	"strings"

	"git.stormux.org/storm/cthulhu/internal/atspi"
	"git.stormux.org/storm/cthulhu/internal/sound"
)

type speechLine struct {
	Object atspi.ObjectID
	Raw    string
}
type indentationData struct {
	signature string
	columns   int
}
type indentationHistory map[atspi.ObjectID]indentationData

func indentation_data(line string) indentationData {
	var data indentationData
	for _, value := range line {
		switch value {
		case ' ', '\u00a0':
			data.columns++
			value = ' '
		case '\t':
			data.columns += 4 - data.columns%4
		default:
			return data
		}
		data.signature += string(value)
	}
	return data
}

func (worker *speechWorker) line_text(text string, line *speechLine) string {
	if line == nil || worker.reading == nil {
		return text
	}
	data := indentation_data(line.Raw)
	previous, known := worker.indentation[line.Object]
	if worker.indentation == nil || len(worker.indentation) >= 128 && !known {
		worker.indentation = make(indentationHistory)
	}
	worker.indentation[line.Object] = data
	settings := worker.reading()
	if !settings.EnableIndentation || settings.OnlySpeakDisplayedText || known && previous.signature == data.signature {
		return text
	}
	mode := settings.IndentationPresentationMode
	if (mode == "beeps" || mode == "both") && worker.indentationCue != nil {
		frequency := min(2700, 200+data.columns*30)
		if data.columns > previous.columns {
			frequency += 50
		} else if data.columns < previous.columns {
			frequency = max(100, frequency-50)
		}
		worker.indentationCue(sound.Cue{Name: sound.IndentationCueName(frequency)})
	}
	if mode == "beeps" {
		return text
	}
	word := "columns"
	if data.columns == 1 {
		word = "column"
	}
	return strings.TrimSuffix(fmt.Sprintf("indentation %d %s, %s", data.columns, word, text), ", ")
}

func document_speech_line(line atspi.DocumentLine) *speechLine {
	if len(line.Contents) == 0 {
		return nil
	}
	content := line.Contents[0]
	if content.Snapshot.Role == "password text" {
		return nil
	}
	raw := content.RawText
	if raw == "" {
		raw = content.Text
	}
	return &speechLine{Object: content.Snapshot.ID(), Raw: raw}
}