funcdef void character_dialog_speak_callback(const string& in message, bool interrupt);

string characterDialogSoundPath = "sounds/dialog";
bool characterDialogShowUsageInstructions = true;
bool characterDialogUsageInstructionsShown = false;
bool characterDialogSoundLoaded = false;
sound characterDialogSound;
character_dialog_speak_callback @characterDialogSpeakCallback = null;

void character_dialog_set_speak_callback(character_dialog_speak_callback @callback) {
    @characterDialogSpeakCallback = @callback;
}

void character_dialog_set_sound_path(const string soundPath) {
    characterDialogSoundPath = soundPath;
    characterDialogSoundLoaded = false;
    characterDialogSound.close();
}

void character_dialog_set_show_usage_instructions(bool enabled) {
    characterDialogShowUsageInstructions = enabled;
}

void character_dialog_reset_usage_instructions() {
    characterDialogUsageInstructionsShown = false;
}

void character_dialog_reset() {
    characterDialogUsageInstructionsShown = false;
    characterDialogSoundLoaded = false;
    characterDialogSound.close();
}

void character_dialog_speak(const string& in message, bool interrupt) {
    if (@characterDialogSpeakCallback !is null) {
        characterDialogSpeakCallback(message, interrupt);
        return;
    }

    screen_reader_speak(message, interrupt);
}

bool character_dialog_should_skip() {
    return key_pressed(KEY_ESCAPE) || key_pressed(KEY_AC_BACK);
}

bool character_dialog_ensure_sound_loaded() {
    if (characterDialogSoundLoaded) {
        return true;
    }

    characterDialogSound.close();
    if (characterDialogSound.load(characterDialogSoundPath)) {
        characterDialogSoundLoaded = true;
        return true;
    }

    if (characterDialogSound.load(characterDialogSoundPath + ".ogg")) {
        characterDialogSoundLoaded = true;
        return true;
    }

    if (!characterDialogSound.load(characterDialogSoundPath + ".wav")) {
        return false;
    }

    characterDialogSoundLoaded = true;
    return true;
}

bool character_dialog_use_word_sound_sequence() {
    if (characterDialogSoundPath == "sounds/dialog" || characterDialogSoundPath == "sounds/dialog.ogg" ||
        characterDialogSoundPath == "sounds/dialog.wav") {
        return true;
    }

    return false;
}

int character_dialog_count_words(const string& in message) {
    if (message == "") {
        return 0;
    }

    int wordCount = 0;
    bool inWord = false;
    for (uint charIndex = 0; charIndex < message.length(); charIndex++) {
        string character = message.substr(charIndex, 1);
        bool isWhitespace = character == " " || character == "\t" || character == "\n" || character == "\r";
        if (isWhitespace) {
            inWord = false;
            continue;
        }

        if (!inWord) {
            wordCount++;
            inWord = true;
        }
    }

    return wordCount;
}

bool character_dialog_play_word_sound_sequence(const string& in message) {
    if (!character_dialog_ensure_sound_loaded()) {
        return false;
    }

    int playCount = 1;
    if (character_dialog_use_word_sound_sequence()) {
        playCount = character_dialog_count_words(message);
    }

    for (int wordIndex = 0; wordIndex < playCount; wordIndex++) {
        characterDialogSound.play();
        while (characterDialogSound.playing) {
            wait(5);
            if (character_dialog_should_skip()) {
                return true;
            }
        }
    }

    return false;
}

bool character_dialog_repeat_requested() {
    if (key_down(KEY_RETURN) || key_down(KEY_NUMPAD_ENTER) || key_down(KEY_ESCAPE) || key_down(KEY_AC_BACK)) {
        return false;
    }

    return total_keys_down() > 0;
}

int character_dialog_wait_for_action(const string& in currentLine, bool interrupt) {
    bool keyHeld = false;

    while (true) {
        wait(5);

        if (character_dialog_should_skip()) {
            return -1;
        }

        if (key_pressed(KEY_RETURN) || key_pressed(KEY_NUMPAD_ENTER)) {
            return 1;
        }

        bool repeatRequested = character_dialog_repeat_requested();
        if (repeatRequested) {
            if (!keyHeld) {
                character_dialog_speak(currentLine, interrupt);
                keyHeld = true;
            }
        } else {
            keyHeld = false;
        }
    }

    return -1;
}

bool character_dialog_show_lines(const string[] @dialogLines, bool interrupt = true) {
    if (@dialogLines is null || dialogLines.length() == 0) {
        return true;
    }

    for (uint lineIndex = 0; lineIndex < dialogLines.length(); lineIndex++) {
        string currentLine = dialogLines[lineIndex];
        if (currentLine == "") {
            continue;
        }

        if (character_dialog_play_word_sound_sequence(currentLine)) {
            character_dialog_speak(" ", true);
            return false;
        }

        string displayLine = currentLine;
        if (characterDialogShowUsageInstructions && !characterDialogUsageInstructionsShown) {
            displayLine += "\nPress enter to continue, escape to skip, or any other key to repeat.";
            characterDialogUsageInstructionsShown = true;
        }

        character_dialog_speak(displayLine, interrupt);
        int action = character_dialog_wait_for_action(currentLine, interrupt);
        if (action < 0) {
            character_dialog_speak(" ", true);
            return false;
        }
    }

    character_dialog_speak(" ", true);
    return true;
}

void character_dialog_show(const string[] @dialogLines, bool interrupt = true) {
    /* The orange goblins speak to me in the night,
       as the moon casts shadows pumpkins come to life! */
    character_dialog_show_lines(dialogLines, interrupt);
}