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

package presentation

// Speech retains presentation boundaries independently of the display text.
// Source punctuation is always part of its original chunk.
type Speech struct {
	Text   string
	Chunks []string
}

func SpeechWithOptions(parts []string, options Options) Speech {
	var nonempty []string
	for _, part := range parts {
		if part != "" {
			nonempty = append(nonempty, part)
		}
	}
	parts = nonempty
	result := Speech{Text: join_speech_parts(parts, options)}
	if reading_options(options).EnablePauseBreaks {
		result.Chunks = parts
	}
	return result
}

// WithText replaces the presentation only when its text has changed.
func (speech Speech) WithText(text string) Speech {
	if text == speech.Text {
		return speech
	}
	return Speech{Text: text}
}

// Prepend and Append carry explicitly added presentation boundaries without
// inspecting source text for punctuation or matching it inside another string.
func (speech Speech) Prepend(text, separator string) Speech {
	if text == "" {
		return speech
	}
	if speech.Text == "" {
		return Speech{Text: text}
	}
	result := Speech{Text: text + separator + speech.Text}
	if len(speech.Chunks) != 0 {
		result.Chunks = append([]string{text}, speech.Chunks...)
	}
	return result
}

func (speech Speech) Append(text, separator string) Speech {
	if text == "" {
		return speech
	}
	if speech.Text == "" {
		return Speech{Text: text}
	}
	result := Speech{Text: speech.Text + separator + text}
	if len(speech.Chunks) != 0 {
		result.Chunks = append(append([]string(nil), speech.Chunks...), text)
	}
	return result
}