/**
 *  This script handles disabling/enabling the different choices
 *  accross the vote options.
 *  This prevents sending weird votes that choose the same person for multiple truths.
 */

const vote_select_tracking = new Map();

function log_select_change(event) {
    const changed_select = event.target;
    const original_index = vote_select_tracking.get(changed_select)
    for (const select of vote_select_tracking) {
        select.at(0)[original_index].disabled = false;
        // Don't disable the default entry, or the one we just moved to.
        if (changed_select.selectedIndex !== 0 && select.at(0) !== changed_select)
            select.at(0)[changed_select.selectedIndex].disabled = true
    }

    // Make sure to change the selected *attribute*, because the .selected property doesn't impact
    // the form output, it seems.
    changed_select[original_index].removeAttribute("selected");
    changed_select[changed_select.selectedIndex].setAttribute("selected", true);
    // Update with the new tracked index.
    vote_select_tracking.set(changed_select, changed_select.selectedIndex);
}

const selected_indices = [];
for (const select of document.getElementsByTagName("select")) {
    select.addEventListener("change", log_select_change);
    vote_select_tracking.set(select, select.selectedIndex);
    if (select.selectedIndex !== 0) {
        selected_indices.push(select.selectedIndex);
    }
}

for (const select of document.getElementsByTagName("select")) {
    for (const selected_index of selected_indices) {
        select[selected_index].disabled = true;
    }
}