import {urlRegex as websitePattern} from '../../bbcode/core';
import {Infotag} from '../../interfaces';

const daUsernamePattern = /^([a-z0-9_\-]+)$/i;
const daSitePattern = /^https?:\/\/([a-z0-9_\-]+)\.deviantart\.com\//i;
const emailPattern = /^((?:[a-z0-9])+(?:[a-z0-9\._-])*@(?:[a-z0-9_-])+(?:[a-z0-9\._-]+)+)$/i;
const faUsernamePattern = /^([a-z0-9_\-~.]+)$/i;
const faSitePattern = /^https?:\/\/(?:www\.)?furaffinity\.net\/user\/([a-z0-9_\-~,]+)\/?$/i;
const inkbunnyUsernamePattern = /^([a-z0-9]+)$/i;
const inkbunnySitePattern = /^https?:\/\/inkbunny\.net\/([a-z0-9]+)\/?$/i;
const skypeUsernamePattern = /^([a-z][a-z0-9.,\-_]*)/i;
const twitterUsernamePattern = /^([a-z0-9_]+)$/i;
const twitterSitePattern = /^https?:\/\/(?:www\.)?twitter\.com\/([a-z0-9_]+)\/?$/i;
const yimUsernamePattern = /^([a-z0-9_\-]+)$/i;

const daNormalize = normalizeSiteUsernamePair(daSitePattern, daUsernamePattern);
const faNormalize = normalizeSiteUsernamePair(faSitePattern, faUsernamePattern);
const inkbunnyNormalize = normalizeSiteUsernamePair(inkbunnySitePattern, inkbunnyUsernamePattern);
const twitterNormalize = normalizeSiteUsernamePair(twitterSitePattern, twitterUsernamePattern);

function normalizeSiteUsernamePair(site: RegExp, username: RegExp): (value: string) => string | undefined {
    return (value: string): string | undefined => {
        let matches = value.match(site);
        if(matches !== null && matches.length === 2)
            return matches[1];
        matches = value.match(username);
        if(matches !== null && matches.length === 2)
            return matches[1];
        return;
    };
}

export function formatContactValue(infotag: Infotag, value: string): string {
    const methodName = infotag.name.toLowerCase();
    const formatters: {[key: string]: (() => string | undefined) | undefined} = {
        deviantart(): string | undefined {
            return daNormalize(value);
        },
        furaffinity(): string | undefined {
            return faNormalize(value);
        },
        inkbunny(): string | undefined {
            return inkbunnyNormalize(value);
        },
        twitter(): string | undefined {
            return twitterNormalize(value);
        }
    };
    if(typeof formatters[methodName] === 'function') {
        const formatted = formatters[methodName]!();
        return formatted !== undefined ? formatted : value;
    }
    return value;
}

export function formatContactLink(infotag: Infotag, value: string): string | undefined {
    const methodName = infotag.name.toLowerCase();
    const formatters: {[key: string]: (() => string | undefined) | undefined} = {
        deviantart(): string | undefined {
            const username = daNormalize(value);
            if(username !== undefined)
                return `https://${username}.deviantart.com/`;
        },
        'e-mail'(): string | undefined {
            const matches = value.match(emailPattern);
            if(matches !== null && matches.length === 2)
                return `mailto:${value}`;
        },
        furaffinity(): string | undefined {
            const username = faNormalize(value);
            if(username !== undefined)
                return `https://www.furaffinity.net/user/${username}`;
        },
        inkbunny(): string | undefined {
            const username = inkbunnyNormalize(value);
            if(username !== undefined)
                return `https://inkbunny.net/${username}`;
        },
        skype(): string | undefined {
            const matches = value.match(skypeUsernamePattern);
            if(matches !== null && matches.length === 2)
                return `skype:${value}?chat`;
        },
        twitter(): string | undefined {
            const username = twitterNormalize(value);
            if(username !== undefined)
                return `https://twitter.com/${username}`;
        },
        website(): string | undefined {
            const matches = value.match(websitePattern);
            if(matches !== null && matches.length === 2)
                return value;
        },
        yim(): string | undefined {
            const matches = value.match(yimUsernamePattern);
            if(matches !== null && matches.length === 2)
                return `ymsg:sendIM?${value}`;
        }
    };
    if(typeof formatters[methodName] === 'function')
        return formatters[methodName]!();
    return;
}