export function autocomplete (inputField, path) {
    const input = inputField.querySelector('input');
    const inputId = input.id;
    input.autocomplete = 'off';

    const results = document.createElement('ul');
    results.className="autocomplete-results";

    let selectedLi = null;
    let inputValue = '';

    let clickOccured = false;

    const leaveSelectedLi = () => {
        if (selectedLi !== null) {
            selectedLi.classList.remove('selected');
            selectedLi = null;
        }
    }

    const selectLi = (element) => {
        leaveSelectedLi();
        selectedLi = element;
        if (element !== null) {
            selectedLi.classList.add('selected');
        }
        return selectedLi;
    }

    input.addEventListener('blur', () => {
        setTimeout(() => {
            if (!clickOccured) {
                results.hidden = true;
            }
        },500);
        clickOccured = false;
    });

    input.addEventListener('keydown', (e) => {
        if (e.key === 'Enter') {
            e.preventDefault();
            if (selectedLi !== null) {
                selectedLi.click();
            }
        }
        const liste = results.querySelectorAll('li');
        if(liste.length === 0) {
            return;
        } else {
            results.hidden = false;
        }
        if (e.key === 'ArrowDown') {
            e.preventDefault();
            if (selectedLi === null) {
                input.value = selectLi(results.querySelector('li')).innerText;
            } else {
                selectLi(results.querySelector('#' + inputId + '-ui-' + (Number(selectedLi.dataset.id) + 1)));
                input.value = selectedLi !== null ? selectedLi.innerText : inputValue
            }
        }
        if(e.key === 'ArrowUp') {
            e.preventDefault();
            if (selectedLi === null) {
                input.value = selectLi(liste[liste.length - 1]).innerText;
            } else {
                selectLi(results.querySelector('#' + inputId + '-ui-' + (Number(selectedLi.dataset.id) - 1)));
                input.value = selectedLi !== null ? selectedLi.innerText : inputValue
            }
        }
    })

    const clearResults = () => {
        results.innerHTML = '';
        results.hidden = true;
    }

    input.addEventListener('input', (e) => {
        const term = input.value.trim();

        if (term.length === 0) {
            // Ne pas envoyer de requête si le champ est vide
            results.innerText = '';
            clearResults();
            return;
        }

        // Envoyer une requête Fetch
        fetch(path+ '?query=' + encodeURIComponent(term), {
            headers: {
                'X-Requested-With': 'XMLHttpRequest'
            }
        })
        .then(response => {
            if (!response.ok) {
                throw new Error('Erreur lors de la récupération des suggestions');
            }
            return response.json();
        })
        .then(data => {
            showResults(data);
            return true;
        })
        .catch(error => {
            console.error(error);
            return false;
        });
    });

    const showResults = (data) => {
        inputValue = input.value;
        results.hidden = false;
        results.innerHTML = '';
        let i = 0;
        leaveSelectedLi();
        data.forEach(element => {
            const li = document.createElement('li');
            li.innerText = element;
            li.classList.add('autocomplete-item');
            li.id = inputId + '-ui-' + (++i);
            li.dataset.id = i;
            results.appendChild(li);
            li.addEventListener('mouseover', (e) => {
                selectLi(e.target);
            });
            
            li.addEventListener('click', (e) => {
                clickOccured = true;
                input.value = e.target.innerText;
                clearResults();
            },true)
        })
        if (data.length > 0) {
            input.after(results);
        }
    }
}