import {
    getRequestHeaders,
    getStoppingStrings,
    novelai_setting_names,
    saveSettingsDebounced,
    setGenerationParamsFromPreset
} from "../script.js";
import { getCfgPrompt } from "./extensions/cfg/util.js";
import { MAX_CONTEXT_DEFAULT } from "./power-user.js";
import { getTextTokens, tokenizers } from "./tokenizers.js";
import {
    getSortableDelay,
    getStringHash,
    onlyUnique,
    uuidv4,
} from "./utils.js";

const default_preamble = "[ Style: chat, complex, sensory, visceral ]";
const default_order = [1, 5, 0, 2, 3, 4];
const maximum_output_length = 150;
const default_presets = {
    "clio-v1": "Talker-Chat-Clio",
    "kayra-v1": "Carefree-Kayra"
}

export const nai_settings = {
    temperature: 1.5,
    repetition_penalty: 2.25,
    repetition_penalty_range: 2048,
    repetition_penalty_slope: 0.09,
    repetition_penalty_frequency: 0,
    repetition_penalty_presence: 0.005,
    tail_free_sampling: 0.975,
    top_k: 10,
    top_p: 0.75,
    top_a: 0.08,
    typical_p: 0.975,
    min_length: 1,
    model_novel: "clio-v1",
    preset_settings_novel: "Talker-Chat-Clio",
    streaming_novel: false,
    preamble: default_preamble,
    prefix: '',
    cfg_uc: '',
    banned_tokens: '',
    order: default_order,
    logit_bias: [],
};

const nai_tiers = {
    0: 'Paper',
    1: 'Tablet',
    2: 'Scroll',
    3: 'Opus',
};

let novel_data = null;
let badWordsCache = {};
let biasCache = undefined;

export function setNovelData(data) {
    novel_data = data;
}

export function getKayraMaxContextTokens() {
    switch (novel_data?.tier) {
        case 1:
            return 3072;
        case 2:
            return 6144;
        case 3:
            return 8192;
    }

    return null;
}

export function getNovelTier() {
    return nai_tiers[novel_data?.tier] ?? 'no_connection';
}

export function getNovelAnlas() {
    return novel_data?.trainingStepsLeft?.fixedTrainingStepsLeft ?? 0;
}

export function getNovelUnlimitedImageGeneration() {
    return novel_data?.perks?.unlimitedImageGeneration ?? false;
}

export async function loadNovelSubscriptionData() {
    const result = await fetch('/api/novelai/status', {
        method: 'POST',
        headers: getRequestHeaders(),
    });

    if (result.ok) {
        const data = await result.json();
        setNovelData(data);
    }

    return result.ok;
}

export function loadNovelPreset(preset) {
    if (preset.genamt === undefined) {
        const needsUnlock = preset.max_context > MAX_CONTEXT_DEFAULT;
        $("#amount_gen").val(preset.max_length).trigger('input');
        $('#max_context_unlocked').prop('checked', needsUnlock).trigger('change');
        $("#max_context").val(preset.max_context).trigger('input');
    }
    else {
        setGenerationParamsFromPreset(preset);
    }

    nai_settings.temperature = preset.temperature;
    nai_settings.repetition_penalty = preset.repetition_penalty;
    nai_settings.repetition_penalty_range = preset.repetition_penalty_range;
    nai_settings.repetition_penalty_slope = preset.repetition_penalty_slope;
    nai_settings.repetition_penalty_frequency = preset.repetition_penalty_frequency;
    nai_settings.repetition_penalty_presence = preset.repetition_penalty_presence;
    nai_settings.tail_free_sampling = preset.tail_free_sampling;
    nai_settings.top_k = preset.top_k;
    nai_settings.top_p = preset.top_p;
    nai_settings.top_a = preset.top_a;
    nai_settings.typical_p = preset.typical_p;
    nai_settings.min_length = preset.min_length;
    nai_settings.cfg_scale = preset.cfg_scale;
    nai_settings.phrase_rep_pen = preset.phrase_rep_pen;
    nai_settings.mirostat_lr = preset.mirostat_lr;
    nai_settings.mirostat_tau = preset.mirostat_tau;
    nai_settings.prefix = preset.prefix;
    nai_settings.cfg_uc = preset.cfg_uc || '';
    nai_settings.banned_tokens = preset.banned_tokens || '';
    nai_settings.order = preset.order || default_order;
    nai_settings.logit_bias = preset.logit_bias || [];
    nai_settings.preamble = preset.preamble || default_preamble;
    loadNovelSettingsUi(nai_settings);
}

export function loadNovelSettings(settings) {
    //load the rest of the Novel settings without any checks
    nai_settings.model_novel = settings.model_novel;
    $('#model_novel_select').val(nai_settings.model_novel);
    $(`#model_novel_select option[value=${nai_settings.model_novel}]`).attr("selected", true);

    if (settings.nai_preamble !== undefined) {
        nai_settings.preamble = settings.nai_preamble;
        delete settings.nai_preamble;
    }
    nai_settings.preset_settings_novel = settings.preset_settings_novel;
    nai_settings.temperature = settings.temperature;
    nai_settings.repetition_penalty = settings.repetition_penalty;
    nai_settings.repetition_penalty_range = settings.repetition_penalty_range;
    nai_settings.repetition_penalty_slope = settings.repetition_penalty_slope;
    nai_settings.repetition_penalty_frequency = settings.repetition_penalty_frequency;
    nai_settings.repetition_penalty_presence = settings.repetition_penalty_presence;
    nai_settings.tail_free_sampling = settings.tail_free_sampling;
    nai_settings.top_k = settings.top_k;
    nai_settings.top_p = settings.top_p;
    nai_settings.top_a = settings.top_a;
    nai_settings.typical_p = settings.typical_p;
    nai_settings.min_length = settings.min_length;
    nai_settings.phrase_rep_pen = settings.phrase_rep_pen;
    nai_settings.cfg_scale = settings.cfg_scale;
    nai_settings.mirostat_lr = settings.mirostat_lr;
    nai_settings.mirostat_tau = settings.mirostat_tau;
    nai_settings.streaming_novel = !!settings.streaming_novel;
    nai_settings.preamble = settings.preamble || default_preamble;
    nai_settings.prefix = settings.prefix;
    nai_settings.cfg_uc = settings.cfg_uc || '';
    nai_settings.banned_tokens = settings.banned_tokens || '';
    nai_settings.order = settings.order || default_order;
    nai_settings.logit_bias = settings.logit_bias || [];
    loadNovelSettingsUi(nai_settings);
}

function loadNovelSettingsUi(ui_settings) {
    $("#temp_novel").val(ui_settings.temperature);
    $("#temp_counter_novel").text(Number(ui_settings.temperature).toFixed(2));
    $("#rep_pen_novel").val(ui_settings.repetition_penalty);
    $("#rep_pen_counter_novel").text(Number(ui_settings.repetition_penalty).toFixed(2));
    $("#rep_pen_size_novel").val(ui_settings.repetition_penalty_range);
    $("#rep_pen_size_counter_novel").text(Number(ui_settings.repetition_penalty_range).toFixed(0));
    $("#rep_pen_slope_novel").val(ui_settings.repetition_penalty_slope);
    $("#rep_pen_slope_counter_novel").text(Number(`${ui_settings.repetition_penalty_slope}`).toFixed(2));
    $("#rep_pen_freq_novel").val(ui_settings.repetition_penalty_frequency);
    $("#rep_pen_freq_counter_novel").text(Number(ui_settings.repetition_penalty_frequency).toFixed(5));
    $("#rep_pen_presence_novel").val(ui_settings.repetition_penalty_presence);
    $("#rep_pen_presence_counter_novel").text(Number(ui_settings.repetition_penalty_presence).toFixed(3));
    $("#tail_free_sampling_novel").val(ui_settings.tail_free_sampling);
    $("#tail_free_sampling_counter_novel").text(Number(ui_settings.tail_free_sampling).toFixed(3));
    $("#top_k_novel").val(ui_settings.top_k);
    $("#top_k_counter_novel").text(Number(ui_settings.top_k).toFixed(0));
    $("#top_p_novel").val(ui_settings.top_p);
    $("#top_p_counter_novel").text(Number(ui_settings.top_p).toFixed(2));
    $("#top_a_novel").val(ui_settings.top_a);
    $("#top_a_counter_novel").text(Number(ui_settings.top_a).toFixed(2));
    $("#typical_p_novel").val(ui_settings.typical_p);
    $("#typical_p_counter_novel").text(Number(ui_settings.typical_p).toFixed(3));
    $("#cfg_scale_novel").val(ui_settings.cfg_scale);
    $("#cfg_scale_counter_novel").text(Number(ui_settings.cfg_scale).toFixed(2));
    $("#phrase_rep_pen_novel").val(ui_settings.phrase_rep_pen || "off");
    $("#mirostat_lr_novel").val(ui_settings.mirostat_lr);
    $("#mirostat_lr_counter_novel").text(Number(ui_settings.mirostat_lr).toFixed(2));
    $("#mirostat_tau_novel").val(ui_settings.mirostat_tau);
    $("#mirostat_tau_counter_novel").text(Number(ui_settings.mirostat_tau).toFixed(2));
    $("#min_length_novel").val(ui_settings.min_length);
    $("#min_length_counter_novel").text(Number(ui_settings.min_length).toFixed(0));
    $('#nai_preamble_textarea').val(ui_settings.preamble);
    $('#nai_prefix').val(ui_settings.prefix || "vanilla");
    $('#nai_cfg_uc').val(ui_settings.cfg_uc || "");
    $('#nai_banned_tokens').val(ui_settings.banned_tokens || "");

    $("#streaming_novel").prop('checked', ui_settings.streaming_novel);
    sortItemsByOrder(ui_settings.order);
    displayLogitBias(ui_settings.logit_bias);
}

const sliders = [
    {
        sliderId: "#temp_novel",
        counterId: "#temp_counter_novel",
        format: (val) => Number(val).toFixed(2),
        setValue: (val) => { nai_settings.temperature = Number(val).toFixed(2); },
    },
    {
        sliderId: "#rep_pen_novel",
        counterId: "#rep_pen_counter_novel",
        format: (val) => Number(val).toFixed(2),
        setValue: (val) => { nai_settings.repetition_penalty = Number(val).toFixed(2); },
    },
    {
        sliderId: "#rep_pen_size_novel",
        counterId: "#rep_pen_size_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.repetition_penalty_range = Number(val).toFixed(0); },
    },
    {
        sliderId: "#rep_pen_slope_novel",
        counterId: "#rep_pen_slope_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.repetition_penalty_slope = Number(val).toFixed(2); },
    },
    {
        sliderId: "#rep_pen_freq_novel",
        counterId: "#rep_pen_freq_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.repetition_penalty_frequency = Number(val).toFixed(5); },
    },
    {
        sliderId: "#rep_pen_presence_novel",
        counterId: "#rep_pen_presence_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.repetition_penalty_presence = Number(val).toFixed(3); },
    },
    {
        sliderId: "#tail_free_sampling_novel",
        counterId: "#tail_free_sampling_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.tail_free_sampling = Number(val).toFixed(3); },
    },
    {
        sliderId: "#top_k_novel",
        counterId: "#top_k_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.top_k = Number(val).toFixed(0); },
    },
    {
        sliderId: "#top_p_novel",
        counterId: "#top_p_counter_novel",
        format: (val) => Number(val).toFixed(2),
        setValue: (val) => { nai_settings.top_p = Number(val).toFixed(2); },
    },
    {
        sliderId: "#top_a_novel",
        counterId: "#top_a_counter_novel",
        format: (val) => Number(val).toFixed(2),
        setValue: (val) => { nai_settings.top_a = Number(val).toFixed(2); },
    },
    {
        sliderId: "#typical_p_novel",
        counterId: "#typical_p_counter_novel",
        format: (val) => Number(val).toFixed(3),
        setValue: (val) => { nai_settings.typical_p = Number(val).toFixed(3); },
    },
    {
        sliderId: "#mirostat_tau_novel",
        counterId: "#mirostat_tau_counter_novel",
        format: (val) => Number(val).toFixed(2),
        setValue: (val) => { nai_settings.mirostat_tau = Number(val).toFixed(2); },
    },
    {
        sliderId: "#mirostat_lr_novel",
        counterId: "#mirostat_lr_counter_novel",
        format: (val) => Number(val).toFixed(2),
        setValue: (val) => { nai_settings.mirostat_lr = Number(val).toFixed(2); },
    },
    {
        sliderId: "#cfg_scale_novel",
        counterId: "#cfg_scale_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.cfg_scale = Number(val).toFixed(2); },
    },
    {
        sliderId: "#min_length_novel",
        counterId: "#min_length_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.min_length = Number(val).toFixed(0); },
    },
    {
        sliderId: "#nai_cfg_uc",
        counterId: "#nai_cfg_uc_counter",
        format: (val) => val,
        setValue: (val) => { nai_settings.cfg_uc = val; },
    },
    {
        sliderId: "#nai_banned_tokens",
        counterId: "#nai_banned_tokens_counter",
        format: (val) => val,
        setValue: (val) => { nai_settings.banned_tokens = val; },
    }
];

function getBadWordIds(banned_tokens, tokenizerType) {
    if (tokenizerType === tokenizers.NONE) {
        return [];
    }

    const cacheKey = `${getStringHash(banned_tokens)}-${tokenizerType}`;

    if (cacheKey in badWordsCache && Array.isArray(badWordsCache[cacheKey])) {
        console.debug(`Bad words ids cache hit for "${banned_tokens}"`, badWordsCache[cacheKey]);
        return badWordsCache[cacheKey];
    }

    const result = [];
    const sequence = banned_tokens.split('\n');

    for (let token of sequence) {
        const trimmed = token.trim();

        // Skip empty lines
        if (trimmed.length === 0) {
            continue;
        }

        // Verbatim text
        if (trimmed.startsWith('{') && trimmed.endsWith('}')) {
            const tokens = getTextTokens(tokenizerType, trimmed.slice(1, -1));
            result.push(tokens);
        }

        // Raw token ids, JSON serialized
        else if (trimmed.startsWith('[') && trimmed.endsWith(']')) {
            try {
                const tokens = JSON.parse(trimmed);

                if (Array.isArray(tokens) && tokens.every(t => Number.isInteger(t))) {
                    result.push(tokens);
                } else {
                    throw new Error('Not an array of integers');
                }
            } catch (err) {
                console.log(`Failed to parse bad word token list: ${trimmed}`, err);
            }
        }

        // Apply permutations
        else {
            const permutations = getBadWordPermutations(trimmed).map(t => getTextTokens(tokenizerType, t));
            result.push(...permutations);
        }
    }

    // Cache the result
    console.debug(`Bad words ids for "${banned_tokens}"`, result);
    badWordsCache[cacheKey] = result;

    return result;
}

function getBadWordPermutations(text) {
    const result = [];

    // Original text
    result.push(text);
    // Original text + leading space
    result.push(` ${text}`);
    // First letter capitalized
    result.push(text[0].toUpperCase() + text.slice(1));
    // Ditto + leading space
    result.push(` ${text[0].toUpperCase() + text.slice(1)}`);
    // First letter lower cased
    result.push(text[0].toLowerCase() + text.slice(1));
    // Ditto + leading space
    result.push(` ${text[0].toLowerCase() + text.slice(1)}`);
    // Original all upper cased
    result.push(text.toUpperCase());
    // Ditto + leading space
    result.push(` ${text.toUpperCase()}`);
    // Original all lower cased
    result.push(text.toLowerCase());
    // Ditto + leading space
    result.push(` ${text.toLowerCase()}`);

    return result.filter(onlyUnique);
}

export function getNovelGenerationData(finalPrompt, this_settings, this_amount_gen, isImpersonate, cfgValues) {
    if (cfgValues && cfgValues.guidanceScale && cfgValues.guidanceScale?.value !== 1) {
        cfgValues.negativePrompt = (getCfgPrompt(cfgValues.guidanceScale, true))?.value;
    }

    const clio = nai_settings.model_novel.includes('clio');
    const kayra = nai_settings.model_novel.includes('kayra');

    const tokenizerType = kayra ? tokenizers.NERD2 : (clio ? tokenizers.NERD : tokenizers.NONE);
    const stopSequences = (tokenizerType !== tokenizers.NONE)
        ? getStoppingStrings(isImpersonate)
            .map(t => getTextTokens(tokenizerType, t))
        : undefined;

    const badWordIds = (tokenizerType !== tokenizers.NONE)
        ? getBadWordIds(nai_settings.banned_tokens, tokenizerType)
        : undefined;

    const prefix = selectPrefix(nai_settings.prefix, finalPrompt);

    let logitBias = [];
    if (tokenizerType !== tokenizers.NONE && Array.isArray(nai_settings.logit_bias) && nai_settings.logit_bias.length) {
        logitBias = biasCache || calculateLogitBias();
        biasCache = logitBias;
    }

    return {
        "input": finalPrompt,
        "model": nai_settings.model_novel,
        "use_string": true,
        "temperature": Number(nai_settings.temperature),
        "max_length": this_amount_gen < maximum_output_length ? this_amount_gen : maximum_output_length,
        "min_length": Number(nai_settings.min_length),
        "tail_free_sampling": Number(nai_settings.tail_free_sampling),
        "repetition_penalty": Number(nai_settings.repetition_penalty),
        "repetition_penalty_range": Number(nai_settings.repetition_penalty_range),
        "repetition_penalty_slope": Number(nai_settings.repetition_penalty_slope),
        "repetition_penalty_frequency": Number(nai_settings.repetition_penalty_frequency),
        "repetition_penalty_presence": Number(nai_settings.repetition_penalty_presence),
        "top_a": Number(nai_settings.top_a),
        "top_p": Number(nai_settings.top_p),
        "top_k": Number(nai_settings.top_k),
        "typical_p": Number(nai_settings.typical_p),
        "mirostat_lr": Number(nai_settings.mirostat_lr),
        "mirostat_tau": Number(nai_settings.mirostat_tau),
        "cfg_scale": cfgValues?.guidanceScale?.value ?? Number(nai_settings.cfg_scale),
        "cfg_uc": cfgValues?.negativePrompt ?? nai_settings.cfg_uc ?? "",
        "phrase_rep_pen": nai_settings.phrase_rep_pen,
        "stop_sequences": stopSequences,
        "bad_words_ids": badWordIds,
        "logit_bias_exp": logitBias,
        "generate_until_sentence": true,
        "use_cache": false,
        "return_full_text": false,
        "prefix": prefix,
        "order": nai_settings.order || this_settings.order || default_order,
    };
}

// Check if the prefix needs to be overriden to use instruct mode
function selectPrefix(selected_prefix, finalPrompt) {
    let useInstruct = false;
    const clio = nai_settings.model_novel.includes('clio');
    const kayra = nai_settings.model_novel.includes('kayra');
    const isNewModel = clio || kayra;

    if (isNewModel) {
        // NovelAI claims they scan backwards 1000 characters (not tokens!) to look for instruct brackets. That's really short.
        const tail = finalPrompt.slice(-1500);
        useInstruct = tail.includes("}");
        return useInstruct ? "special_instruct" : selected_prefix;
    }

    return "vanilla";
}

// Sort the samplers by the order array
function sortItemsByOrder(orderArray) {
    console.debug('Preset samplers order: ' + orderArray);
    const $draggableItems = $("#novel_order");

    // Sort the items by the order array
    for (let i = 0; i < orderArray.length; i++) {
        const index = orderArray[i];
        const $item = $draggableItems.find(`[data-id="${index}"]`).detach();
        $draggableItems.append($item);
    }

    // Update the disabled class for each sampler
    $draggableItems.children().each(function () {
        const isEnabled = orderArray.includes(parseInt($(this).data('id')));
        $(this).toggleClass('disabled', !isEnabled);

        // If the sampler is disabled, move it to the bottom of the list
        if (!isEnabled) {
            const item = $(this).detach();
            $draggableItems.append(item);
        }
    });
}

function saveSamplingOrder() {
    const order = [];
    $('#novel_order').children().each(function () {
        const isEnabled = !$(this).hasClass('disabled');
        if (isEnabled) {
            order.push($(this).data('id'));
        }
    });
    nai_settings.order = order;
    console.log('Samplers reordered:', nai_settings.order);
    saveSettingsDebounced();
}

function displayLogitBias(logit_bias) {
    if (!Array.isArray(logit_bias)) {
        console.log('Logit bias set not found');
        return;
    }

    $('.novelai_logit_bias_list').empty();

    for (const entry of logit_bias) {
        if (entry) {
            createLogitBiasListItem(entry);
        }
    }

    biasCache = undefined;
}

function createNewLogitBiasEntry() {
    const entry = { id: uuidv4(), text: '', value: 0 };
    nai_settings.logit_bias.push(entry);
    biasCache = undefined;
    createLogitBiasListItem(entry);
    saveSettingsDebounced();
}

function createLogitBiasListItem(entry) {
    const id = entry.id;
    const template = $('#novelai_logit_bias_template .novelai_logit_bias_form').clone();
    template.data('id', id);
    template.find('.novelai_logit_bias_text').val(entry.text).on('input', function () {
        entry.text = $(this).val();
        biasCache = undefined;
        saveSettingsDebounced();
    });
    template.find('.novelai_logit_bias_value').val(entry.value).on('input', function () {
        entry.value = Number($(this).val());
        biasCache = undefined;
        saveSettingsDebounced();
    });
    template.find('.novelai_logit_bias_remove').on('click', function () {
        $(this).closest('.novelai_logit_bias_form').remove();
        const index = nai_settings.logit_bias.indexOf(entry);
        if (index > -1) {
            nai_settings.logit_bias.splice(index, 1);
        }
        biasCache = undefined;
        saveSettingsDebounced();
    });
    $('.novelai_logit_bias_list').prepend(template);
}

/**
 * Calculates logit bias for Novel AI
 * @returns {object[]} Array of logit bias objects
 */
function calculateLogitBias() {
    const bias_preset = nai_settings.logit_bias;

    if (!Array.isArray(bias_preset) || bias_preset.length === 0) {
        return [];
    }

    const clio = nai_settings.model_novel.includes('clio');
    const kayra = nai_settings.model_novel.includes('kayra');
    const tokenizerType = kayra ? tokenizers.NERD2 : (clio ? tokenizers.NERD : tokenizers.NONE);

    /**
     * Creates a bias object for Novel AI
     * @param {number} bias Bias value
     * @param {number[]} sequence Sequence of token ids
     */
    function getBiasObject(bias, sequence) {
        return {
            bias: bias,
            ensure_sequence_finish: false,
            generate_once: false,
            sequence: sequence
        };
    }

    const result = [];

    for (const entry of bias_preset) {
        if (entry.text?.length > 0) {
            const text = entry.text.trim();

            // Skip empty lines
            if (text.length === 0) {
                continue;
            }

            // Verbatim text
            if (text.startsWith('{') && text.endsWith('}')) {
                const tokens = getTextTokens(tokenizerType, text.slice(1, -1));
                result.push(getBiasObject(entry.value, tokens));
            }

            // Raw token ids, JSON serialized
            else if (text.startsWith('[') && text.endsWith(']')) {
                try {
                    const tokens = JSON.parse(text);

                    if (Array.isArray(tokens) && tokens.every(t => Number.isInteger(t))) {
                        result.push(getBiasObject(entry.value, tokens));
                    } else {
                        throw new Error('Not an array of integers');
                    }
                } catch (err) {
                    console.log(`Failed to parse logit bias token list: ${text}`, err);
                }
            }

            // Text with a leading space
            else {
                const biasText = ` ${text}`;
                const tokens = getTextTokens(tokenizerType, biasText);
                result.push(getBiasObject(entry.value, tokens));
            }
        }
    }

    return result;
}

/**
 * Transforms instruction into compatible format for Novel AI if Novel AI instruct format not already detected.
 * 1. Instruction must begin and end with curly braces followed and preceded by a space.
 * 2. Instruction must not contain square brackets as it serves different purpose in NAI.
 * @param {string} prompt Original instruction prompt
 * @returns Processed prompt
 */
export function adjustNovelInstructionPrompt(prompt) {
    const stripedPrompt = prompt.replace(/[\[\]]/g, '').trim();
    if (!stripedPrompt.includes('{ ')) {
        return `{ ${stripedPrompt} }`;
    }
    return stripedPrompt;
}

function tryParseStreamingError(decoded) {
    try {
        const data = JSON.parse(decoded);

        if (!data) {
            return;
        }

        if (data.message && data.statusCode >= 400) {
            toastr.error(data.message, 'Error');
            throw new Error(data);
        }
    }
    catch {
        // No JSON. Do nothing.
    }
}

export async function generateNovelWithStreaming(generate_data, signal) {
    generate_data.streaming = nai_settings.streaming_novel;

    const response = await fetch('/api/novelai/generate', {
        headers: getRequestHeaders(),
        body: JSON.stringify(generate_data),
        method: 'POST',
        signal: signal,
    });

    return async function* streamData() {
        const decoder = new TextDecoder();
        const reader = response.body.getReader();
        let getMessage = '';
        let messageBuffer = "";
        while (true) {
            const { done, value } = await reader.read();
            let decoded = decoder.decode(value);
            let eventList = [];

            tryParseStreamingError(decoded);

            // ReadableStream's buffer is not guaranteed to contain full SSE messages as they arrive in chunks
            // We need to buffer chunks until we have one or more full messages (separated by double newlines)
            messageBuffer += decoded;
            eventList = messageBuffer.split("\n\n");
            // Last element will be an empty string or a leftover partial message
            messageBuffer = eventList.pop();

            for (let event of eventList) {
                for (let subEvent of event.split('\n')) {
                    if (subEvent.startsWith("data")) {
                        let data = JSON.parse(subEvent.substring(5));
                        getMessage += (data?.token || '');
                        yield getMessage;
                    }
                }
            }

            if (done) {
                return;
            }
        }
    }
}

$("#nai_preamble_textarea").on('input', function () {
    nai_settings.preamble = String($('#nai_preamble_textarea').val());
    saveSettingsDebounced();
});

$("#nai_preamble_restore").on('click', function () {
    nai_settings.preamble = default_preamble;
    $('#nai_preamble_textarea').val(nai_settings.preamble);
    saveSettingsDebounced();
});

jQuery(function () {
    sliders.forEach(slider => {
        $(document).on("input", slider.sliderId, function () {
            const value = $(this).val();
            const formattedValue = slider.format(value);
            slider.setValue(value);
            $(slider.counterId).text(formattedValue);
            saveSettingsDebounced();
        });
    });

    $('#streaming_novel').on('input', function () {
        const value = !!$(this).prop('checked');
        nai_settings.streaming_novel = value;
        saveSettingsDebounced();
    });

    $("#model_novel_select").change(function () {
        nai_settings.model_novel = String($("#model_novel_select").find(":selected").val());
        saveSettingsDebounced();

        // Update the selected preset to something appropriate
        const default_preset = default_presets[nai_settings.model_novel];
        $(`#settings_perset_novel`).val(novelai_setting_names[default_preset]);
        $(`#settings_perset_novel option[value=${novelai_setting_names[default_preset]}]`).attr("selected", "true")
        $(`#settings_perset_novel`).trigger("change");
    });

    $("#nai_prefix").on('change', function () {
        nai_settings.prefix = String($("#nai_prefix").find(":selected").val());
        saveSettingsDebounced();
    });

    $("#phrase_rep_pen_novel").on('change', function () {
        nai_settings.phrase_rep_pen = String($("#phrase_rep_pen_novel").find(":selected").val());
        saveSettingsDebounced();
    });

    $('#novel_order').sortable({
        delay: getSortableDelay(),
        stop: saveSamplingOrder,
    });

    $('#novel_order .toggle_button').on('click', function () {
        const $item = $(this).closest('[data-id]');
        const isEnabled = !$item.hasClass('disabled');
        $item.toggleClass('disabled', isEnabled);
        console.log('Sampler toggled:', $item.data('id'), !isEnabled);
        saveSamplingOrder();
    });

    $("#novelai_logit_bias_new_entry").on("click", createNewLogitBiasEntry);
});