import { Buffer } from "buffer";
import { appState, settings } from "./stores";
import globalCss from './global.css';

import pngv3, { inject_data } from "./pngv3";
import webm from "./webm";
import gif from "./gif";
import jpg, { convertToPng } from "./jpg";
import thirdeye from "./thirdeye";
import pomf from "./pomf";

import { GM_fetch, GM_head, headerStringToObject } from "./requests";

import App from "./Components/App.svelte";
import ScrollHighlighter from "./Components/ScrollHighlighter.svelte";
import PostOptions from "./Components/PostOptions.svelte";
import SettingsButton from './Components/SettingsButton.svelte';
//import Embedding from './Components/Embedding.svelte';
import Embeddings from './Components/Embeddings.svelte';
import EyeButton from './Components/EyeButton.svelte';
import NotificationsHandler from './Components/NotificationsHandler.svelte';
import { buildPeeFile, fireNotification } from "./utils";
import { fileTypeFromBuffer } from "file-type";
import { getQueryProcessor, QueryProcessor } from "./websites";
import { lolisafe } from "./filehosts";

export interface ImageProcessor {
    skip?: true;
    match(fn: string): boolean;
    has_embed(b: Buffer, fn?: string, prevurl?: string): boolean | Promise<boolean>;
    extract(b: Buffer, fn?: string): EmbeddedFile[] | Promise<EmbeddedFile[]>;
    inject?(b: File, c: File[]): Buffer | Promise<Buffer>;
}
let qp: QueryProcessor;

export let csettings: Parameters<typeof settings['set']>[0];
let processors: ImageProcessor[] =
    [thirdeye, pomf, pngv3, jpg, webm, gif];

let cappState: Parameters<typeof appState['set']>[0];
settings.subscribe(b => {
    csettings = b;
    processors = [...(!csettings.te ? [thirdeye] : []),
        pngv3, pomf, jpg, webm, gif
    ];
});

appState.subscribe(v => {
    cappState = v;
});

// most pngs are encoded with 65k idat chunks
async function* streamRemote(url: string, chunkSize = 72 * 1024, fetchRestOnNonCanceled = true) {
    const headers = await GM_head(url);
    const h = headerStringToObject(headers);
    const size = +h['content-length'];
    let ptr = 0;
    let fetchSize = chunkSize;
    while (ptr != size) {
        //console.log('doing a fetch of ', url, ptr, ptr + fetchSize - 1);
        const res = await GM_fetch(url, { headers: { range: `bytes=${ptr}-${ptr + fetchSize - 1}` } }) as any as Tampermonkey.Response<any>;
        const obj = headerStringToObject(res.responseHeaders);
        if (!('content-length' in obj)) {
            console.warn("no content lenght???", url);
            break;
        } const len = +obj['content-length'];
        ptr += len;
        if (fetchRestOnNonCanceled)
            fetchSize = size;
        const val = Buffer.from(await (res as any).arrayBuffer());
        const e = (yield val) as boolean;
        //console.log('yeieledd, a', e);
        if (e) {
            break;
        }
    }
    //console.log("streaming ended, ", ptr, size);
}

type EmbeddedFileWithPreview = {
    page?: { title: string, url: string }; // can be a booru page
    source?: string; // can be like a twitter post this was posted in originally
    thumbnail: Buffer;
    filename: string;
    data: EmbeddedFileWithoutPreview['data'] | ((lisn?: EventTarget) => Promise<Buffer>);
};

type EmbeddedFileWithoutPreview = {
    page: undefined;
    source: undefined;
    thumbnail: undefined;
    filename: string;
    data: string | Buffer;
};

export type EmbeddedFile = EmbeddedFileWithPreview | EmbeddedFileWithoutPreview;

const processImage = async (src: string, fn: string, hex: string, prevurl: string, onfound: () => void): Promise<([EmbeddedFile[], boolean] | undefined)[]> => {
    return Promise.all(processors.filter(e => e.match(fn)).map(async proc => {
        if (proc.skip) {
            // skip file downloading, file is referenced from the filename
            // basically does things like filtering out blacklisted tags
            const md5 = Buffer.from(hex, 'base64');
            if (await proc.has_embed(md5, fn, prevurl) === true) {
                onfound();
                return [await proc.extract(md5, fn), true] as [EmbeddedFile[], boolean];
            } return;
        }
        // TODO: Move this outside the loop?
        const iter = streamRemote(src);
        if (!iter)
            return;
        let cumul = Buffer.alloc(0);
        let found: boolean | undefined;
        let chunk: ReadableStreamDefaultReadResult<Buffer> = { done: true };
        do {
            const { value, done } = await iter.next(found === false);
            if (done) {
                chunk = { done: true } as ReadableStreamDefaultReadDoneResult;
            } else {
                chunk = { done: false, value } as ReadableStreamDefaultReadValueResult<Buffer>;
            }
            if (!done)
                cumul = Buffer.concat([cumul, value!]);
            found = await proc.has_embed(cumul);
        } while (found !== false && !chunk.done);
        await iter.next(true);
        if (found === false) {
            //console.log(`Gave up on ${src} after downloading ${cumul.byteLength} bytes...`);
            return;
        }
        onfound();
        return [await proc.extract(cumul), false] as [EmbeddedFile[], boolean];
    }));
};

const textToElement = <T = HTMLElement>(s: string) =>
    document.createRange().createContextualFragment(s).children[0] as any as T;

const processPost = async (post: HTMLDivElement) => {
    const origlink = qp.getImageLink(post);
    if (!origlink)
        return;
    const thumbLink = qp.getThumbnailLink(post);
    if (!thumbLink)
        return;
    let res2 = await processImage(origlink, qp.getFilename(post), qp.getMD5(post), thumbLink,
        () => {
            post.querySelector('.post')?.classList.add("embedfound");
        });
    res2 = res2?.filter(e => e);
    if (!res2 || res2.length == 0)
        return;
    processAttachments(post, res2?.flatMap(e => e![0].map(k => [k, e![1]] as [EmbeddedFile, boolean])));
};

const versionCheck = async () => {
    const [lmajor, lminor] =
        (await (await GM_fetch("https://git.coom.tech/coomdev/PEE/raw/branch/%e4%b8%ad%e5%87%ba%e3%81%97/main.meta.js"))
            .text())
            .split('\n')
            .filter(e => e.includes("// @version"))[0].match(/.*version\s+(.*)/)![1].split('.')
            .map(e => +e);
    const [major, minor] = GM.info.script.version.split('.').map(e => +e);
    if (major < lmajor || (major == lmajor && minor < lminor)) {
        fireNotification("info", `Last PEE version is ${lmajor}.${lminor}, you're on ${major}.${minor}`);
    }
};

// Not using the clipboard API because it needs focus
function copyTextToClipboard(text: string) {
    const copyFrom = document.createElement("textarea");
    copyFrom.textContent = text;
    document.body.appendChild(copyFrom);
    copyFrom.select();
    document.execCommand('copy');
    copyFrom.blur();
    document.body.removeChild(copyFrom);
    navigator.clipboard.writeText(text);
}

const scrapeBoard = async (self: HTMLButtonElement) => {
    self.disabled = true;
    self.textContent = "Searching...";
    const boardname = location.pathname.match(/\/(.*)\//)![1];
    const res = await GM_fetch(`https://a.4cdn.org/${boardname}/threads.json`);
    const pages = await res.json() as Page[];
    type Page = { threads: Thread[] }
    type Thread = { no: number; posts: Post[] };
    type BasePost = { no: number, resto: number, tim: number };
    type PostWithFile = BasePost & { tim: number, ext: string, md5: string, filename: string };
    type PostWithoutFile = BasePost & Record<string, unknown>;
    type Post = (PostWithoutFile | PostWithFile);
    fireNotification("info", "Fetching all threads...");
    const threads = (await Promise.all(pages
        .reduce((a: Thread[], b: Page) => [...a, ...b.threads], [])
        .map(e => e.no)
        .map(async id => {
            try {
                const res = await GM_fetch(`https://a.4cdn.org/${boardname}/thread/${id}.json`);
                return await res.json() as Thread;
            } catch {
                return undefined;
            }
        }))).filter(e => e).map(e => e as Thread);
    const filenames = threads
        .reduce((a, b) => [...a, ...b.posts.filter(p => p.ext)
            .map(p => p as PostWithFile)], [] as PostWithFile[]).filter(p => p.ext != '.webm' && p.ext != '.gif')
        .map(p => [p.resto || p.no, `https://i.4cdn.org/${boardname}/${p.tim}${p.ext}`, p.md5, p.filename + p.ext,] as [number, string, string, string]);

    console.log(filenames);
    fireNotification("info", "Analyzing images...");
    const n = 7;
    //console.log(posts);
    const processFile = (src: string, fn: string, hex: string) => {
        return Promise.all(processors.filter(e => e.match(fn)).map(async proc => {
            if (proc.skip) {
                const md5 = Buffer.from(hex, 'base64');
                return await proc.has_embed(md5, fn);
            }
            // TODO: Move this outside the loop?
            const iter = streamRemote(src);
            if (!iter)
                return false;
            let cumul = Buffer.alloc(0);
            let found: boolean | undefined;
            let chunk: ReadableStreamDefaultReadResult<Buffer> = { done: true };
            do {
                const { value, done } = await iter.next(found === false);
                if (done) {
                    chunk = { done: true } as ReadableStreamDefaultReadDoneResult;
                } else {
                    chunk = { done: false, value } as ReadableStreamDefaultReadValueResult<Buffer>;
                }
                if (!done)
                    cumul = Buffer.concat([cumul, value!]);
                found = await proc.has_embed(cumul);
            } while (found !== false && !chunk.done);
            await iter.next(true);
            return found === true;
        }));
    };
    const range = ~~(filenames.length / n) + 1;
    const hasEmbed: typeof filenames = [];
    const total = filenames.length;
    let processed = 0;

    const int = setInterval(() => {
        fireNotification("info", `Processed [${processed} / ${total}] files`);
    }, 5000);

    await Promise.all([...new Array(n + 1)].map(async (e, i) => {
        const postsslice = filenames.slice(i * range, (i + 1) * range);
        for (const post of postsslice) {
            try {
                const res = await processFile(post[1], post[3], post[2]);
                processed++;
                if (res.some(e => e)) {
                    hasEmbed.push(post);
                }
            } catch (e) {
                console.log(e);
            }
        }
    }));

    clearInterval(int);

    const counters: Record<number, number> = {};
    for (const k of hasEmbed)
        counters[k[0]] = k[0] in counters ? counters[k[0]] + 1 : 1;
    console.log(counters);
    fireNotification("success", "Processing finished! Results pasted in the clipboard");
    const text = Object.entries(counters).sort((a, b) => b[1] - a[1]).map(e => `>>${e[0]} (${e[1]})`).join('\n');
    console.log(text);
    copyTextToClipboard(text);
    self.textContent = "Copy Results";
    self.disabled = false;
    self.onclick = () => {
        copyTextToClipboard(text);
    };
};

const startup = async (is4chanX = true) => {
    appState.set({ ...cappState, is4chanX });
    const lqp = getQueryProcessor(is4chanX);
    if (!lqp)
        return;
    else
        qp = lqp;

    if (csettings.vercheck)
        versionCheck();

    if (!is4chanX && location.host.startsWith('boards.4chan')) {
        const qr = QR;
        const show = qr.show.bind(qr);
        qr.show = (...args: any[]) => {
            show(...args);
            document.dispatchEvent(new CustomEvent("QRDialogCreation", {
                detail: document.getElementById('quickReply')
            }));
        };

        document.addEventListener("QRGetFile", (e) => {
            const qr = document.getElementById('qrFile') as HTMLInputElement | null;
            document.dispatchEvent(new CustomEvent("QRFile", { detail: (qr?.files || [])[0] }));
        });

        document.addEventListener("QRSetFile", ((e: CustomEvent<{ file: Blob, name: string }>) => {
            const qr = document.getElementById('qrFile') as HTMLInputElement | null;
            if (!qr) return;
            const dt = new DataTransfer();
            dt.items.add(new File([e.detail.file], e.detail.name));
            qr.files = dt.files;
        }) as any);

        const notificationHost = document.createElement('span');
        new NotificationsHandler({
            target: notificationHost
        });
        document.body.append(notificationHost);
    }
    //await Promise.all([...document.querySelectorAll('.postContainer')].filter(e => e.textContent?.includes("191 KB")).map(e => processPost(e as any)));

    // keep this to handle posts getting inlined
    const mo = new MutationObserver(reco => {
        for (const rec of reco)
            if (rec.type == "childList")
                rec.addedNodes.forEach(e => {
                    if (!(e instanceof HTMLElement))
                        return;
                    // apparently querySelector cannot select the root element if it matches
                    let el = qp.postsWithFiles(e);
                    if (!el && e.classList.contains('postContainer'))
                        el = [e];
                    if (el)
                        [...el].map(el => processPost(el as any));
                });
    });

    document.querySelectorAll('.board').forEach(e => {
        mo.observe(e!, { childList: true, subtree: true });
    });
    const posts = qp.postsWithFiles();

    const scts = qp.settingsHost();
    const button = textToElement(`<span></span>`);
    const settingsButton = new SettingsButton({
        target: button
    });
    scts?.appendChild(button);

    const appHost = textToElement(`<div class="pee-settings"></div>`);
    const appInstance = new App({ target: appHost });
    document.body.append(appHost);

    const scrollHost = textToElement(`<div class="pee-scroll"></div>`);
    new ScrollHighlighter({ target: scrollHost });
    document.body.append(scrollHost);

    appState.set({
        ...cappState,
        isCatalog: !!document.querySelector('.catalog-small') || !!location.pathname.match(/\/catalog$/),
    });
    //await processPost(posts[0] as any);

    if (cappState.isCatalog) {
        const opts = qp.catalogControlHost() as HTMLDivElement;
        if (opts) {
            const button = document.createElement('button');
            button.textContent = "おもらし";
            button.onclick = () => scrapeBoard(button);
            opts.insertAdjacentElement("beforebegin", button);
        }
    }

    const n = 7;
    //console.log(posts);
    const range = ~~(posts.length / n) + 1;
    await Promise.all([...new Array(n + 1)].map(async (e, i) => {
        const postsslice = posts.slice(i * range, (i + 1) * range);
        for (const post of postsslice) {
            try {
                await processPost(post as any);
            } catch (e) { console.log('Processing failed for post', post, e); }
        }
    }));
    //await Promise.all(posts.map(e => processPost(e as any)));
};

document.addEventListener('4chanXInitFinished', () => startup(true));
document.addEventListener('4chanParsingDone', () => startup(false), { once: true });
if (GM.info.script.matches.slice(2).some(m => m.includes(location.host))) {
    window.addEventListener('load', () => {
        startup(false);
    }, { once: true });
}

document.addEventListener('4chanThreadUpdated', ((e: CustomEvent<{ count: number }>) => {
    document.dispatchEvent(new CustomEvent("ThreadUpdate", {
        detail: {
            newPosts: [...document.querySelector(".thread")!.children].slice(-e.detail.count).map(e => 'b.' + e.id.slice(2))
        }
    }));
}) as any);

document.addEventListener('ThreadUpdate', <any>(async (e: CustomEvent<any>) => {
    const newPosts = e.detail.newPosts;
    for (const post of newPosts) {
        const postContainer = document.getElementById("pc" + post.substring(post.indexOf(".") + 1)) as HTMLDivElement;
        processPost(postContainer);
    }
}));

document.addEventListener('QRDialogCreation', <any>((e: CustomEvent<HTMLElement>) => {
    const a = document.createElement('span');

    new PostOptions({
        target: a,
        props: { processors, textinput: (e.detail || e.target).querySelector('textarea')! }
    });

    let target;
    if (!cappState.is4chanX) {
        target = e.detail;
        a.style.display = "inline-block";
        target.querySelector("input[type=submit]")?.insertAdjacentElement("beforebegin", a);
    }
    else {
        target = e.target as HTMLDivElement;
        target.querySelector('#qr-filename-container')?.appendChild(a);
    }

}), { once: !cappState!.is4chanX }); // 4chan's normal extension destroys the QR form everytime

const customStyles = document.createElement('style');
customStyles.appendChild(document.createTextNode(globalCss));
document.documentElement.insertBefore(customStyles, null);

function processAttachments(post: HTMLDivElement, ress: [EmbeddedFile, boolean][]) {
    if (ress.length == 0)
        return;
    const replyBox = qp.getPost(post);
    const external = ress[0][1];
    if (external)
        replyBox?.classList.add('hasext');
    else
        replyBox?.classList.add('hasembed');
    if (ress.length > 1)
        replyBox?.classList.add('hasmultiple');

    if (!cappState.foundPosts.includes(replyBox as HTMLElement))
        cappState.foundPosts.push(replyBox as HTMLElement);
    appState.set(cappState);

    const isCatalog = replyBox?.classList.contains('catalog-post');
    // add buttons
    if (!isCatalog) {
        const ft = qp.getFileThumbnail(post);
        const info = qp.getInfoBox(post);
        const filehost: HTMLElement | null = ft.querySelector('.filehost');
        const eyehost: HTMLElement | null = info.querySelector('.eyehost');
        const imgcont = filehost || document.createElement('div');
        const eyecont = eyehost || document.createElement('span');

        if (!filehost) {
            ft.append(imgcont);
            imgcont.classList.add("fileThumb");
            imgcont.classList.add("filehost");
        } else {
            imgcont.innerHTML = '';
        }
        if (!eyehost) {
            info.append(eyecont);
            eyecont.classList.add("eyehost");
        } else {
            eyecont.innerHTML = '';
        }
        const id = ~~(Math.random() * 20000000);
        const emb = new Embeddings({
            target: imgcont,
            props: {
                files: ress.map(e => e[0]),
                id: '' + id
            }
        });
        new EyeButton({
            target: eyecont,
            props: {
                files: ress.map(e => e[0]),
                inst: emb,
                id: '' + id
            }
        });
    } else {
        const opFile = post.querySelector('.catalog-link');
        const ahem = opFile?.querySelector('.catalog-host');
        const imgcont = ahem || document.createElement('div');
        imgcont.className = "catalog-host";
        if (ahem) {
            imgcont.innerHTML = '';
        }
        const emb = new Embeddings({
            target: imgcont,
            props: {
                files: ress.map(e => e[0])
            }
        });
        if (!ahem)
            opFile?.append(imgcont);
    }

    post.setAttribute('data-processed', "true");
}

//if ((window as any)['pagemode']) {
//    onload = () => {
//        const resbuf = async (s: EmbeddedFile['data']) => typeof s != "string" && (Buffer.isBuffer(s) ? s : await s());
//        const container = document.getElementById("container") as HTMLInputElement;
//        container.onchange = async () => {
//            const api = lolisafe('zz.ht', 'z.zz.fo');
//            const file = container.files![0];
//            const blo = new Blob([file], {type: 'application/octet-stream'});
//            const link = await api.uploadFile(blo);
//            console.log(link);
//        };
//    };
//}
//
////if ((window as any)['pagemode']) {
//    onload = () => {
//        const extraction = document.getElementById("extraction") as HTMLInputElement;
//        extraction.onchange = async () => {
//            const pee = await convertToPng(extraction.files![0]);
//            const result = document.getElementById("result") as HTMLImageElement;
//            const data = await inject_data(new File([pee!], 'image.png', { type: "image/png" }), Buffer.from("coom"));
//            result.src = URL.createObjectURL(new Blob([data]));
//        };
//    };
//}

//         document.addEventListener("CreateNotification", (e: any) => console.log(e.detail));
//         console.log("loaded");
//         //const resbuf = async (s: any) => ((Buffer.isBuffer(s) ? s : await s()));
//         const container = document.getElementById("container") as HTMLInputElement;
//         const injection = document.getElementById("injection") as HTMLInputElement;
//         injection.multiple = true;
//         extraction.onchange = async () => {
//             const embedded = await pngv3.extract(Buffer.from(await extraction.files![0].arrayBuffer()));
//             const d = document.createElement('div');
//             new Embeddings({
//                 target: d,
//                 props: { files: embedded }
//             });
//             document.body.append(d);
//         };

//         container.onchange = injection.onchange = async () => {
//             console.log('eval changed');
//             if (container.files?.length && injection.files?.length) {
//                 const dlr = document.getElementById("dlr") as HTMLAnchorElement;
//                 //const dle = document.getElementById("dle") as HTMLAnchorElement;
//                 const res = await pngv3.inject!(container.files[0], [...injection.files]);
//                 const result = document.getElementById("result") as HTMLImageElement;
//                 //const extracted = document.getElementById("extracted") as HTMLImageElement;
//                 const res2 = new Blob([res], { type: (await fileTypeFromBuffer(res))?.mime });
//                 result.src = URL.createObjectURL(res2);
//                 dlr.href = result.src;
//                 console.log('url created');
//                 //const embedded = await pngv3.extract(res);
//                 //if (!embedded) {
//                 //    debugger;
//                 return;
//                 //}
//                 //extracted.src = URL.createObjectURL(new Blob([await resbuf(embedded.data!)]));
//                 //dle.href = extracted.src;
//             }
//         };
//     };
// }

// if ((window as any)['pagemode']) {
//     onload = () => {
//         document.body.innerHTML = '';

//         new App({
//             target: document.body
//         });
//         setTimeout(() => {
//             document.dispatchEvent(new CustomEvent("penis"));
//         }, 30);
//     };
// }