(function () {
    "use strict";

    const body = document.querySelector("#trip-list [data-data-list-body]");
    const loading = document.getElementById("trip-loading");
    const error = document.getElementById("trip-error");
    const summary = document.getElementById("trip-summary");
    const timeline = document.getElementById("trip-timeline");
    const scrubber = document.getElementById("trip-scrubber");
    const playButton = document.getElementById("trip-play");
    const replayTime = document.getElementById("trip-replay-time");
    const replaySpeed = document.getElementById("trip-replay-speed");
    const mapEl = document.getElementById("history-map");
    const tileUrl = mapEl.dataset.tileUrl || "/static/vendor/tiles/{z}/{x}/{y}.png";
    const tileAttrib = mapEl.dataset.tileAttrib || "© MapTiler © OpenStreetMap contributors";
    const tileSubdomains = mapEl.dataset.tileSubdomains || "abc";
    const minZoom = parseInt(mapEl.dataset.minZoom, 10) || 3;
    const maxZoom = parseInt(mapEl.dataset.maxZoom, 10) || 19;
    const map = L.map("history-map", { minZoom: minZoom, maxZoom: maxZoom }).setView([48.505, -0.09], 12);
    const tiles = L.tileLayer(tileUrl, {
        minZoom: minZoom, maxZoom: maxZoom,
        subdomains: tileSubdomains, attribution: tileAttrib,
    }).addTo(map);

    // ── Loading spinner on map ──────────────────────────────────────────
    const spinner = L.control({position: "topright"});
    spinner.onAdd = function () {
        var d = L.DomUtil.create("div", "history-spinner");
        d.innerHTML = '<div class="spinner-border spinner-border-sm text-primary" role="status"><span class="visually-hidden">Loading…</span></div>';
        d.style.cssText = "background:rgba(255,255,255,.85);padding:6px 8px;border-radius:4px;box-shadow:0 1px 4px rgba(0,0,0,.1);display:none";
        return d;
    };
    spinner.addTo(map);
    function setLoading(on) { spinner.getContainer().style.display = on ? "block" : "none"; }

    // ── Core state ──────────────────────────────────────────────────────
    let st = {
        route: null, marker: null, points: [], timer: null, ctrl: null, activeRow: null
    };
    let _cache = {};
    let _geoTimer = null, _geoCtrl = null, _lastKey = null;
    const recenterBtn = document.getElementById("btn-recenter-history");
    const locEl = document.getElementById("trip-replay-location");

    // ── Helpers ──────────────────────────────────────────────────────────
    function gk(lat, lon) {
        var a = typeof lat === "number" ? lat : parseFloat(lat);
        var b = typeof lon === "number" ? lon : parseFloat(lon);
        if (isNaN(a) || isNaN(b)) return null;
        return a.toFixed(3) + "," + b.toFixed(3);
    }
    function showErr(m) { error.textContent = m; error.hidden = false; }
    function stopTm() {
        if (st.timer) { clearInterval(st.timer); st.timer = null; }
        playButton.innerHTML = '<i class="fas fa-play" aria-hidden="true"></i>';
        playButton.setAttribute("aria-label", "Play");
    }
    function cleanup() {
        stopTm();
        if (st.route) { map.removeLayer(st.route); st.route = null; }
        if (st.marker) { map.removeLayer(st.marker); st.marker = null; }
        st.points = []; _cache = {}; _lastKey = null;
        if (_geoCtrl) { _geoCtrl.abort(); _geoCtrl = null; }
        clearTimeout(_geoTimer);
        timeline.hidden = true; summary.textContent = "Select a trip";
        locEl.textContent = ""; recenterBtn.hidden = true;
    }
    function hlRow(r) {
        if (st.activeRow) st.activeRow.classList.remove("table-active");
        if (r) r.classList.add("table-active");
        st.activeRow = r;
    }

    // ── Geocode ──────────────────────────────────────────────────────────
    function preload(pts) {
        if (_geoCtrl) _geoCtrl.abort();
        _geoCtrl = new AbortController(); var sig = _geoCtrl.signal; _cache = {};
        var seen = {}, q = [], i;
        for (i = 0; i < pts.length; i++) {
            var k = gk(pts[i].latitude, pts[i].longitude);
            if (!k || seen[k]) continue; seen[k] = 1;
            q.push({k: k, lat: pts[i].latitude, lon: pts[i].longitude});
        }
        if (!q.length) return;
        var C = 2, idx = 0;
        function nx() {
            if (idx >= q.length || sig.aborted) return;
            var it = q[idx++], c = new AbortController();
            var t = setTimeout(function () { c.abort(); }, 3000);
            sig.addEventListener("abort", function () { c.abort(); });
            fetch("/api/geocode?lat=" + it.lat + "&lon=" + it.lon, {signal: c.signal})
                .then(function (r) { clearTimeout(t); return r.ok ? r.json() : null; })
                .then(function (d) { if (!sig.aborted) _cache[it.k] = (d && d.label) || null; })
                .catch(function () { clearTimeout(t); })
                .finally(function () { if (!sig.aborted) nx(); });
        }
        for (var j = 0; j < C && j < q.length; j++) nx();
    }
    function showLoc(lat, lon) {
        var k = gk(lat, lon); if (!k || k === _lastKey) return; _lastKey = k;
        var fb = lat.toFixed(5) + ", " + lon.toFixed(5);
        if (_cache.hasOwnProperty(k)) { locEl.textContent = _cache[k] || fb; return; }
        var c = new AbortController();
        var t = setTimeout(function () { c.abort(); }, 3000);
        fetch("/api/geocode?lat=" + lat + "&lon=" + lon, {signal: c.signal})
            .then(function (r) { clearTimeout(t); return r.ok ? r.json() : null; })
            .then(function (d) {
                var lb = (d && d.label) || fb; _cache[k] = (d && d.label) || null;
                locEl.textContent = lb;
            })
            .catch(function () { clearTimeout(t); locEl.textContent = fb; });
    }
    function schedLoc(lat, lon) {
        clearTimeout(_geoTimer);
        _geoTimer = setTimeout(function () { showLoc(lat, lon); }, 600);
    }

    // ── Format ───────────────────────────────────────────────────────────
    function fD(s) { var h = Math.floor(s / 3600), m = Math.floor((s % 3600) / 60); return h ? h + "h " + m + "m" : m ? m + "m" : s + "s"; }
    function fT(v) { return new Date(v.replace(" ", "T")).toLocaleString(); }
    function fK(km) { return km == null ? "\u2014" : km.toFixed(km < 1 ? 2 : 1) + " km"; }
    function fS(kmh) { return kmh == null ? "\u2014" : kmh.toFixed(1) + " km/h"; }

    // ── Timeline ─────────────────────────────────────────────────────────
    function showPt(i) {
        var p = st.points[i]; if (!p) return;
        st.marker.setLatLng([p.latitude, p.longitude]);
        scrubber.value = i; replayTime.textContent = fT(p.datetime);
        replaySpeed.textContent = (p.speed_source === "obd" ? "OBD" : "GPS") + ": " + fS(p.speed);
        schedLoc(p.latitude, p.longitude);
    }
    function initTL(pts) {
        stopTm(); st.points = pts;
        scrubber.max = Math.max(0, pts.length - 1); scrubber.value = 0;
        timeline.hidden = !pts.length; locEl.textContent = ""; _lastKey = null;
        if (st.marker) { map.removeLayer(st.marker); st.marker = null; }
        if (!pts.length) return;
        st.marker = L.circleMarker(
            [pts[0].latitude, pts[0].longitude],
            {radius: 8, color: "#fff", weight: 3, fillColor: "#e74a3b", fillOpacity: 1}
        ).bindTooltip("Vehicle position").addTo(map);
        showPt(0);
    }

    // ── Trip loader ─────────────────────────────────────────────────────
    var _deb;
    function loadTrip(id) {
        clearTimeout(_deb);
        _deb = setTimeout(function () { _load(id); }, 300);
    }
    async function _load(id) {
        error.hidden = true; cleanup(); setLoading(true);
        if (st.ctrl) st.ctrl.abort();
        st.ctrl = new AbortController(); var sig = st.ctrl.signal;
        try {
            var r = await fetch("/api/trip/" + id, {signal: sig});
            var d = await r.json();
            if (!r.ok) throw new Error(d.error || "Cannot load trip route.");
            if (sig.aborted) return;
            preload(d.points);
            var coords = d.points.map(function (p) { return [p.latitude, p.longitude]; });
            st.route = L.featureGroup();
            L.polyline(coords, {color: "#4e73df", weight: 5}).addTo(st.route);
            if (coords.length) {
                L.marker(coords[0]).bindPopup("Start").addTo(st.route);
                L.marker(coords[coords.length - 1]).bindPopup("End").addTo(st.route);
            }
            st.route.addTo(map);
            if (sig.aborted) { cleanup(); return; }
            if (coords.length > 1) map.fitBounds(st.route.getBounds(), {padding: [24, 24], maxZoom: 15});
            else if (coords.length === 1) map.setView(coords[0], 15);
            if (sig.aborted) { cleanup(); return; }
            recenterBtn.hidden = false;
            recenterBtn.onclick = function () {
                if (coords.length > 1) map.fitBounds(st.route.getBounds(), {padding: [24, 24], maxZoom: 15});
                else if (coords.length === 1) map.setView(coords[0], 15);
            };
            summary.textContent = fK(d.trip.distance_km) + " \u00b7 " + fD(d.trip.duration_seconds) + " \u00b7 avg " + fS(d.trip.average_speed_kmh) + " \u00b7 max " + fS(d.trip.max_speed_kmh) + " \u00b7 " + d.points.length + " pts";
            initTL(d.points);
        } catch (e) { if (e.name !== "AbortError") showErr(e.message); }
        finally { if (!sig.aborted) setLoading(false); }
    }

    // ── Scrubber & play ─────────────────────────────────────────────────
    scrubber.addEventListener("input", function () { stopTm(); showPt(Number(scrubber.value)); });
    playButton.addEventListener("click", function () {
        if (st.timer) { stopTm(); return; }
        if (Number(scrubber.value) >= st.points.length - 1) showPt(0);
        playButton.innerHTML = '<i class="fas fa-pause" aria-hidden="true"></i>';
        playButton.setAttribute("aria-label", "Pause");
        st.timer = setInterval(function () {
            var nx = Number(scrubber.value) + 1;
            if (nx >= st.points.length) { stopTm(); return; }
            showPt(nx);
        }, 500);
    });

    // ── Trip list ────────────────────────────────────────────────────────
    var tl = document.getElementById("trip-list");
    var del = tl && tl.dataset.deletable === "1";
    var dUrl = (tl && tl.dataset.deleteUrl) || "/api/trip/";
    var bUrl = tl && tl.dataset.batchDeleteUrl;
    var btD = document.getElementById("delete-selected-btn");
    function cIds() { return Array.from(body.querySelectorAll("input.trip-checkbox:checked")).map(function (c) { return parseInt(c.value); }); }
    function upBt() { if (!btD) return; var n = cIds().length; btD.hidden = !n; btD.textContent = "Delete selected (" + n + ")"; }
    function slAll() {
        var cbs = body.querySelectorAll("input.trip-checkbox");
        var all = cbs.length && Array.from(cbs).every(function (c) { return c.checked; });
        cbs.forEach(function (c) { c.checked = !all; }); upBt();
    }
    async function delSel() {
        var ids = cIds(); if (!ids.length || !bUrl) return;
        if (!(await window.confirmDelete("Delete " + ids.length + " trip(s)? Raw GPS data is kept."))) return;
        try {
            var r = await fetch(bUrl, {method: "POST", headers: {"Content-Type": "application/json"}, body: JSON.stringify({ids: ids})});
            if (!r.ok) throw new Error("Delete failed");
            ids.forEach(function (id) { var row = body.querySelector('tr[data-trip-id="' + id + '"]'); if (row) row.remove(); });
            upBt();
        } catch (e) { showErr(e.message); }
    }
    if (btD) btD.addEventListener("click", delSel);

    function render(tt) {
        body.replaceChildren();
        tt.forEach(function (t) {
            var row = document.createElement("tr");
            row.dataset.started = t.start_datetime; row.dataset.distance = t.distance_km;
            row.dataset.duration = t.duration_seconds; row.dataset.maxSpeed = t.max_speed_kmh;
            row.dataset.tripId = t.id; row.style.cursor = "pointer";
            var db = del ? '<button class="btn btn-sm btn-outline-danger ms-1" type="button" data-delete-trip-id="' + t.id + '" title="Delete"><i class="fas fa-trash fa-fw"></i></button>' : "";
            var cb = bUrl ? '<td class="text-center" onclick="event.stopPropagation()"><input type="checkbox" class="trip-checkbox form-check-input" value="' + t.id + '"></td>' : "";
            row.innerHTML = cb + "<td>" + fT(t.start_datetime) + "</td><td>" + fK(t.distance_km) + "</td><td>" + fD(t.duration_seconds) + "</td><td>" + fS(t.max_speed_kmh) + "</td><td class=\"text-muted small\">" + (t.odo_start_km != null ? t.odo_start_km.toFixed(0) + " \u2192 " + t.odo_end_km.toFixed(0) + " km" : "\u2014") + "</td><td class=\"text-end text-nowrap d-none d-sm-table-cell\">" + db + "</td>";
            body.appendChild(row);
        });
        body.querySelectorAll("input.trip-checkbox").forEach(function (c) { c.addEventListener("change", upBt); });
        upBt();
    }
    body.addEventListener("click", function (e) {
        if (del) {
            var db = e.target.closest("[data-delete-trip-id]");
            if (db) {
                e.stopPropagation(); e.preventDefault();
                var dt = db.closest("tr").querySelector("td").textContent.trim();
                window.confirmDelete("Delete trip from " + dt + "?\n\nRaw GPS data is kept.")
                    .then(function (ok) {
                        if (!ok) return;
                        return fetch(dUrl + db.dataset.deleteTripId, {method: "DELETE"})
                            .then(function (r) { if (!r.ok) throw new Error("Delete failed"); db.closest("tr").remove(); })
                            .catch(function (err) { showErr(err.message); });
                    });
                return;
            }
        }
        var row = e.target.closest("tr[data-trip-id]");
        if (!row) return;
        hlRow(row);
        loadTrip(row.dataset.tripId);
    });
    fetch("/api/trips")
        .then(function (r) { if (!r.ok) throw new Error("Cannot load trips."); return r.json(); })
        .then(function (d) { render(d.trips); })
        .catch(function (e) { showErr(e.message); })
        .finally(function () { loading.hidden = true; });
}());