const Fuse = require('fuse.js');

const sizes = [500, 1000, 2000];
const queries = ['opt', 'opt-5', 'desc', 'item', '999', 'option-100', 'xxx'];

for (const size of sizes) {
    const options = [];
    for (let i = 0; i < size; i++) {
        options.push({
            value: `option-${i}`,
            fuseKeys: [`option-${i}`, `desc-${i}`, `item number ${i}`],
            state: "normal"
        });
    }

    const fuseOptions = {
        keys: ["fuseKeys"],
        shouldSort: true,
        includeScore: true,
        findAllMatches: true,
        ignoreLocation: true,
        ignoreFieldNorm: true,
        threshold: 0.3,
        minMatchCharLength: 1,
    };

    function searchOld(query) {
        const searchThis = options.map((elem, index) => ({ index, fuseKeys: elem.fuseKeys }));
        const fuse = new Fuse(searchThis, fuseOptions);
        return fuse.search(query);
    }

    let cachedFuse = undefined;
    function searchNew(query) {
        if (cachedFuse === undefined) {
            const searchThis = options.map((elem, index) => ({ index, fuseKeys: elem.fuseKeys }));
            cachedFuse = new Fuse(searchThis, fuseOptions);
        }
        return cachedFuse.search(query);
    }

    // Warmup
    for (const q of queries) { searchOld(q); searchNew(q); }
    
    // OLD
    let start = Date.now();
    for (let iter = 0; iter < 100; iter++) {
        for (const q of queries) { searchOld(q); }
    }
    const oldTime = Date.now() - start;

    // NEW
    cachedFuse = undefined;
    start = Date.now();
    for (let iter = 0; iter < 100; iter++) {
        for (const q of queries) { searchNew(q); }
    }
    const newTime = Date.now() - start;

    console.log(`${size} options: OLD=${oldTime}ms, NEW=${newTime}ms, SPEEDUP=${(oldTime/newTime).toFixed(2)}x`);
}