// Thin wrapper around fetch — JSON in, JSON out. Throws on non-2xx.
async function api(method, url, body) {
    const opts = {
        method,
        headers: { "Content-Type": "application/json" },
        credentials: "same-origin",
    };
    if (body !== undefined) opts.body = JSON.stringify(body);
    const r = await fetch(url, opts);
    let payload = null;
    try { payload = await r.json(); } catch (_) { /* no body */ }
    if (!r.ok) {
        const msg = payload && payload.detail ? payload.detail : `Request failed (${r.status})`;
        throw new Error(msg);
    }
    return payload;
}

window.API = {
    get:    (u)    => api("GET", u),
    post:   (u, b) => api("POST", u, b),
    put:    (u, b) => api("PUT", u, b),
    del:    (u)    => api("DELETE", u),
};

// Time/date helpers
window.fmt = {
    time(t) {
        if (!t) return "";
        const [h, m] = t.split(":").map(Number);
        const period = h >= 12 ? "PM" : "AM";
        const h12 = h % 12 === 0 ? 12 : h % 12;
        return `${h12}:${String(m).padStart(2, "0")} ${period}`;
    },
    date(d) {
        if (!d) return "";
        const dt = new Date(d + "T00:00:00");
        return dt.toLocaleDateString(undefined, { weekday: "long", year: "numeric", month: "long", day: "numeric" });
    },
    dateShort(d) {
        if (!d) return "";
        const dt = new Date(d + "T00:00:00");
        return dt.toLocaleDateString(undefined, { month: "short", day: "numeric", year: "numeric" });
    },
    today() {
        const d = new Date();
        const y = d.getFullYear();
        const m = String(d.getMonth() + 1).padStart(2, "0");
        const day = String(d.getDate()).padStart(2, "0");
        return `${y}-${m}-${day}`;
    },
    tomorrow() {
        const d = new Date();
        d.setDate(d.getDate() + 1);
        const y = d.getFullYear();
        const m = String(d.getMonth() + 1).padStart(2, "0");
        const day = String(d.getDate()).padStart(2, "0");
        return `${y}-${m}-${day}`;
    },
};