import {calculateSimilarityScore} from './distance.js';

document.addEventListener("DOMContentLoaded", function() {
    handleRedirection();
});

function handleRedirection() {
    let path = window.location.pathname.substring(1).toLowerCase();

    if (path === "") {
        window.location.href = "/";
        return;
    }

    fetch('/content/links.json')
        .then(response => response.json())
        .then(data => {
            const bestMatch = findBestMatch(path, data.links);
            if (bestMatch) {
                window.location.href = bestMatch.href;
            } else {
                displayNotFound();
            }
        })
        .catch(error => {
            console.error('Error fetching links.json:', error);
            displayError();
        });
}

function findBestMatch(path, links) {
    let bestMatch = null;
    let highestScore = -Infinity;
    const threshold = 0.5;

    for (let item of links) {
        const itemName = item.name.toLowerCase();
        const score = calculateSimilarityScore(path, itemName);

        if (score > highestScore) {
            highestScore = score;
            bestMatch = item;
        }
    }

    if (highestScore < threshold) {
        window.location.href = "/";
        return null;
    }

    return bestMatch;
}

function displayNotFound() {
    document.body.innerHTML = '<h1>Not Found</h1><p>The requested page could not be found.</p>';
}

function displayError() {
    document.body.innerHTML = '<h1>Error</h1><p>There was an error retrieving the redirection data.</p>';
}