import ReactHtmlParser, {
    convertNodeToElement,
    type DomElement,
    type DomNode,
    type Transform,
} from '@orrisroot/react-html-parser';
import type { CSSProperties } from 'react';
import { useLocation } from 'react-router';
import type { MultiLang } from '../../config';
import Functions from '../../functions';
import HashLink from './HashLink';

interface Props {
    lang: MultiLang;
    text: string;
    dohtml?: boolean;
    dosmiley?: boolean;
    doxcode?: boolean;
    doimage?: boolean;
    dobr?: boolean;
}

const preConvertXCode = (text: string, doxcode: boolean): string => {
    if (doxcode) {
        return text.replace(/\[code\](.*)\[\/code\]/gs, (_m0, m1) => {
            return `[code]${Functions.base64Encode(m1)}[/code]`;
        });
    }
    return text;
};

const postConvertXCode = (text: string, doxcode: boolean, doimage: boolean): string => {
    if (doxcode) {
        return text.replace(/\[code\](.*)\[\/code\]/gs, (_m0, m1) => {
            const text = convertXCode(Functions.htmlspecialchars(Functions.base64Decode(m1)), doimage);
            return `<div class="xoopsCode"><pre><code>${text}</code></pre></div>`;
        });
    }
    return text;
};

const convertClickable = (text: string) => {
    text = text.replace(
        /(^|[^\]_a-zA-Z0-9-="'/]+)((?:https?|ftp)(?::\/\/[-_.!~*'()a-zA-Z0-9;/?:@&=+$,%#]+[a-zA-Z0-9=]))/g,
        (...matches) => {
            return (
                matches[1] +
                '<a href="' +
                matches[2] +
                '" target="_blank" rel="external noopener noreferrer">' +
                matches[2] +
                '</a>'
            );
        }
    );
    text = text.replace(
        /(^|[^\]_a-zA-Z0-9-="'/:.]+)([a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)+)/g,
        (...matches) => {
            return `${matches[1]}<a href="mailto:${matches[2]}">${matches[2]}</a>`;
        }
    );
    return text;
};

const convertXCode = (text: string, _doimage: boolean): string => {
    // TODO: implement
    return text;
};

const convertSmiley = (text: string) => {
    // TODO: implement
    return text;
};

const convertBr = (text: string): string => {
    return text.replace(/(\r?\n|\r)/g, '<br />');
};

const cssConvert = (text: string): CSSProperties => {
    const ret: Record<string, string> = {};
    text.split(';').forEach((line) => {
        const line_ = line.trim();
        if (line_.length === 0) {
            return;
        }
        const kv = line_.split(':');
        if (kv.length < 2) {
            return;
        }
        ret[Functions.camelCase(kv[0].trim())] = kv.slice(1).join(':').trim();
    });
    return ret as CSSProperties;
};

/**
 * Stored content links are written relative to the page that contains them
 * (`node4.html`, `manual.html#SECTION1`, ...), so they have to be resolved the
 * way a browser resolves an `href`. react-router would instead resolve them
 * against the whole current pathname, turning `/manual_ja/node3.html` +
 * `node4.html` into `/manual_ja/node3.html/node4.html`.
 */
const resolveUrl = (href: string, basePath: string): string => {
    const url = new URL(href, window.location.origin + basePath);
    return url.pathname + url.search + url.hash;
};

const makeTransform = (basePath: string): Transform => {
    const transform: Transform = (node: DomNode, idx: number | string) => {
        if (node.type !== 'tag') {
            return undefined;
        }
        const element = node as DomElement;
        if (element.name !== 'a') {
            return undefined;
        }
        const url = element.attribs?.href;
        const isExternal = !url || /^(mailto|https?:?\/\/)/.test(url);
        if (isExternal) {
            return undefined;
        }
        const style = element.attribs?.style || '';
        const title = element.attribs?.title || '';
        return (
            <HashLink key={idx} to={resolveUrl(url, basePath)} style={cssConvert(style)} title={title}>
                {element.children.map((child, index) => convertNodeToElement(child, index, transform))}
            </HashLink>
        );
    };
    return transform;
};

const XoopsCode = (props: Props) => {
    const { lang } = props;
    const { pathname } = useLocation();
    let text = props.text;
    const dohtml = !!props.dohtml;
    const dosmiley = !!props.dosmiley;
    const doxcode = !!props.doxcode;
    const doimage = !!props.doimage;
    const dobr = !!props.dobr;
    text = preConvertXCode(text, doxcode);
    if (!dohtml) {
        text = Functions.htmlspecialchars(text);
        text = convertClickable(text);
    }
    if (dosmiley) {
        text = convertSmiley(text);
    }
    if (doxcode) {
        text = convertXCode(text, doimage);
    }
    if (dobr) {
        text = convertBr(text);
    }
    text = postConvertXCode(text, doxcode, doimage);
    text = Functions.mlang(text, lang);
    return <div>{ReactHtmlParser(text, { transform: makeTransform(pathname) })}</div>;
};

export default XoopsCode;