import {
    getRequestHeaders,
    getStoppingStrings,
    getTextTokens,
    novelai_setting_names,
    saveSettingsDebounced
} from "../script.js";
import { getCfg } from "./extensions/cfg/util.js";
import { tokenizers } from "./power-user.js";
import { getStringHash } from "./utils.js";

export {
    nai_settings,
    loadNovelPreset,
    loadNovelSettings,
    getNovelTier,
};

const default_preamble = "[ Style: chat, complex, sensory, visceral ]";
const maximum_output_length = 150;
const default_presets = {
    "euterpe-v2": "Classic-Euterpe",
    "krake-v2": "Classic-Krake",
    "clio-v1": "Talker-Chat-Clio",
    "kayra-v1": "Carefree-Kayra"
}

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,
    nai_preamble: default_preamble,
    prefix: '',
    cfg_uc: '',
    banned_tokens: '',
};

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

let novel_data = null;
let badWordsCache = {};

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;
}

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

function loadNovelPreset(preset) {
    $("#amount_gen").val(preset.max_length);
    $("#amount_gen_counter").text(`${preset.max_length}`);
    if (((preset.max_context > 2048) && (!$("#max_context_unlocked")[0].checked)) ||
        ((preset.max_context <= 2048) && ($("#max_context_unlocked")[0].checked))) {
        $("#max_context_unlocked").click();
    }
    $("#max_context").val(preset.max_context);
    $("#max_context_counter").text(`${preset.max_context}`);
    $("#rep_pen_size_novel").attr('max', preset.max_context);

    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 || '';
    loadNovelSettingsUi(nai_settings);
}

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

    if (settings.nai_preamble !== undefined) nai_settings.preamble = 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 || '';
    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(2));
    $("#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.nai_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);
}

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(2),
        setValue: (val) => { nai_settings.typical_p = Number(val).toFixed(2); },
    },
    {
        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;
}

export function getNovelGenerationData(finalPrompt, this_settings, this_amount_gen, isImpersonate) {
    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, false)
            .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);
    const cfgSettings = getCfg();

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

// Check if the prefix needs to be overriden to use instruct mode
function selectPrefix(selected_prefix, finalPromt) {
    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 = finalPromt.slice(-1500);
        useInstruct = tail.includes("}");
        return useInstruct ? "special_instruct" : selected_prefix;
    }

    return "vanilla";
}

export async function generateNovelWithStreaming(generate_data, signal) {
    const response = await fetch('/generate_novelai', {
        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 response = decoder.decode(value);
            let eventList = [];

            // 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 += response;
            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 = $('#nai_preamble_textarea').val();
    saveSettingsDebounced();
});

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

$(document).ready(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);
            console.log('saving');
            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 = $("#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 = $("#nai_prefix").find(":selected").val();
        saveSettingsDebounced();
    });

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