import {
    getRequestHeaders,
    saveSettingsDebounced,
    getStoppingStrings,
    getTextTokens
} from "../script.js";
import { tokenizers } from "./power-user.js";

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

const default_preamble = "[ Style: chat, complex, sensory, visceral ]";

const nai_settings = {
    temperature: 0.5,
    repetition_penalty: 1,
    repetition_penalty_range: 100,
    repetition_penalty_slope: 0,
    repetition_penalty_frequency: 0,
    repetition_penalty_presence: 0,
    tail_free_sampling: 0.68,
    top_k: 0,
    top_p: 1,
    top_a: 1,
    typical_p: 1,
    min_length: 0,
    model_novel: "euterpe-v2",
    preset_settings_novel: "Classic-Euterpe",
    streaming_novel: false,
    nai_preamble: default_preamble,
};

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

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;
    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.streaming_novel = !!settings.streaming_novel;
    loadNovelSettingsUi(nai_settings);
}

const phraseRepPenStrings = [
    null,
    "very_light",
    "light",
    "medium",
    "aggressive",
    "very_aggressive"
]

function getPhraseRepPenString(phraseRepPenCounter) {
    if (phraseRepPenCounter < 1 || phraseRepPenCounter > 5) {
        return null;
    } else {
        return phraseRepPenStrings[phraseRepPenCounter];
    }
}

function getPhraseRepPenCounter(phraseRepPenString) {
    if (phraseRepPenString === phraseRepPenStrings[1]) {
        return 1;
    } else if (phraseRepPenString === phraseRepPenStrings[2]) {
        return 2;
    } else if (phraseRepPenString === phraseRepPenStrings[3]) {
        return 3;
    } else if (phraseRepPenString === phraseRepPenStrings[4]) {
        return 4;
    } else if (phraseRepPenString === phraseRepPenStrings[5]) {
        return 5;
    } else {
        return 0;
    }
}

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(getPhraseRepPenCounter(ui_settings.phrase_rep_pen));
    $("#phrase_rep_pen_counter_novel").text(getPhraseRepPenCounter(ui_settings.phrase_rep_pen));
    $("#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);

    $("#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: "#cfg_scale_novel",
        counterId: "#cfg_scale_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.cfg_scale = Number(val).toFixed(2); },
    },
    {
        sliderId: "#phrase_rep_pen_novel",
        counterId: "#phrase_rep_pen_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.phrase_rep_pen = getPhraseRepPenString(Number(val).toFixed(0)); },
    },
    {
        sliderId: "#min_length_novel",
        counterId: "#min_length_counter_novel",
        format: (val) => `${val}`,
        setValue: (val) => { nai_settings.min_length = Number(val).toFixed(0); },
    },
];

export function getNovelGenerationData(finalPromt, this_settings, this_amount_gen, isImpersonate) {
    const clio = nai_settings.model_novel.includes('clio');
    const kayra = nai_settings.model_novel.includes('kayra');
    const isNewModel = clio || 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;

    let useInstruct = false;
    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 {
        "input": finalPromt,
        "model": nai_settings.model_novel,
        "use_string": true,
        "temperature": parseFloat(nai_settings.temperature),
        "max_length": this_amount_gen, // this_settings.max_length, // <= why?
        "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),
        "cfg_scale": parseFloat(nai_settings.cfg_scale),
        "cfg_uc": "",
        "phrase_rep_pen": nai_settings.phrase_rep_pen,
        //"stop_sequences": {{187}},
        "stop_sequences": stopSequences,
        //bad_words_ids = {{50256}, {0}, {1}};
        "generate_until_sentence": true,
        "use_cache": false,
        "use_string": true,
        "return_full_text": false,
        "prefix": useInstruct ? "special_instruct" : (isNewModel ? "special_proseaugmenter" : "vanilla"),
        "order": this_settings.order,
        "streaming": nai_settings.streaming_novel,
    };
}

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();
    });
});