const filterList = [
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.amazon.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.apple.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.huawei.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.winoffice.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.samsung.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.tiktok.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.tiktok.extended.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.lgwebos.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.vivo.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.oppo-realme.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/native.xiaomi.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/fake.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/popupads.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/tif.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/tif-ips.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/pro.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/dyndns.txt",
    "https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/hoster.txt"
]

Bun.serve({
    async fetch(request, server) {
        let rules: string[] = [];

        for (const filter of filterList) {
            const listReq = await fetch(filter);
            let list = await listReq.text();

            list = list.replace("[Adblock Plus]", '').trim();
            list = list.replace(/^!.*$/gm, '').trim();

            const listArray = list.split('\n')

            rules = rules.concat(listArray)
        }

        const originalRuleCount = rules.length;

        rules = Array.from(new Set(rules));

        const rulesText = makeComment(originalRuleCount, originalRuleCount - rules.length) + rules.join('\n');

        return new Response(rulesText, {
            headers: {
                "content-type": "text/plain; charset=utf-8",
                "Cache-Control": "no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0",
                "Pragma": "no-cache",
                "Expires": "0",
                "Surrogate-Control": "no-store"
            },
        })
    }
})

const makeComment = (originalRuleCount: number, ruleCount: number) => {
    const now = new Date();

    const second = now.getSeconds();
    const minute = now.getMinutes();
    const hour = now.getHours();
    const day = now.getDate();
    const month = now.getMonth() + 1;
    const year = now.getFullYear();

    return `[Adblock Plus]
! Title: HaGeZi's DNS Blocklists Combined
! Description: A collection of DNS blocklists by HaGeZi, combined into one list, with duplicates removed.
! Expires: 1 hour
! Last Modified: ${new Date().toUTCString().split(", ")[1]}
! Version: ${year}.${month}.${day}.${hour}.${minute}.${second}
! Syntax: AdBlock
! Number of Entries: ${ruleCount}
! Original Number of Entries: ${originalRuleCount}
! Total Removed Entries: ${originalRuleCount - ruleCount}\n`
}