console.log("adding features to search...");

const form = document.getElementById("search-form");
const input = document.getElementById("search-input");

// https://stackoverflow.com/a/3809435/16804841
const expression = /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)/gi;
const urlRegex = new RegExp(expression);

const searchEngines = {
    "g": {
        action: "https://www.google.com/search",
        name: "q",
    },
    "d": {
        action: "https://duckduckgo.com/",
        name: "q",
    },
    "y": {
        action: "https://yandex.com/search/",
        name: "text",
    },
    "lure": {
        action: "https://lure.sh/pkgs",
        name: "q",
    },
};

const translationPrefixes = [
    "t",
    "translation",
]


function getDeepLUrl(s) {
    const parts = s.split("-")
    if (parts.length != 3) {
        return undefined
    }

    return `https://www.deepl.com/en/translator?/#${encodeURIComponent(parts[0].trim())}/${encodeURIComponent(parts[1].trim())}/${encodeURIComponent(parts[2].trim())}`;
}


form.addEventListener("submit", event => {
    event.preventDefault();

    s = input.value;

    // check if url
    if (s.match(urlRegex)) {
        window.open(s, "_self");
        return
    }

    // deepl translations
    let doTranslation = false;
    for (const value of translationPrefixes) {
        const prefix = `!${value} `;
        if (s.startsWith(prefix)) {
            doTranslation = true;
            s = s.slice(prefix.length); // Remove the !{key} prefix
            break;
        }
    }

    if (doTranslation) {
        const url = getDeepLUrl(s);
        if (url) {
            window.open(url.toString(), "_self");
            return;
        }
    }

    // Check if the string starts with ! followed by a key from searchEngines
    let selectedEngine = {
        action: form.getAttribute("action"),
        name: input.getAttribute("name"),
    };

    for (const [key, value] of Object.entries(searchEngines)) {
        const prefix = `!${key} `;
        if (s.startsWith(prefix)) {
            selectedEngine = value;
            s = s.slice(prefix.length); // Remove the !{key} prefix
            break;
        }
    }

    const url = new URL(selectedEngine.action);
    url.searchParams.set(selectedEngine.name, s.trim());
    window.open(url.toString(), "_self");
});