(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 map = L.map("history-map", { minZoom: 8, maxZoom: 15 }).setView([48.505, -0.09], 12);
    const tiles = L.tileLayer("/static/vendor/tiles/{z}/{x}/{y}.png", {
        minZoom: 8,
        maxZoom: 15,
        attribution: "© MapTiler © OpenStreetMap contributors",
    });
    let routeLayer = null;
    let vehicleMarker = null;
    let replayPoints = [];
    let replayTimer = null;
    let replayController = null;
    const recenterBtn = document.getElementById("btn-recenter-history");

    function formatDuration(seconds) {
        const hours = Math.floor(seconds / 3600);
        const minutes = Math.floor((seconds % 3600) / 60);
        if (hours) {
            return `${hours}h ${minutes}m`;
        }
        return minutes ? `${minutes}m` : `${seconds}s`;
    }

    function formatDate(value) {
        return new Date(value.replace(" ", "T")).toLocaleString();
    }

    function formatDistance(kilometers) {
        return `${kilometers.toFixed(kilometers < 1 ? 2 : 1)} km`;
    }

    function formatSpeed(kilometersPerHour) {
        return `${kilometersPerHour.toFixed(1)} km/h`;
    }

    function showError(message) {
        error.textContent = message;
        error.hidden = false;
    }

    function stopReplay() {
        if (replayTimer) {
            window.clearInterval(replayTimer);
            replayTimer = null;
        }
        playButton.innerHTML = '<i class="fas fa-play" aria-hidden="true"></i>';
        playButton.setAttribute("aria-label", "Play trip replay");
    }

    function showReplayPoint(index) {
        const point = replayPoints[index];
        if (!point) {
            return;
        }
        const coordinate = [point.latitude, point.longitude];
        vehicleMarker.setLatLng(coordinate);
        scrubber.value = index;
        replayTime.textContent = formatDate(point.datetime);
        const source = point.speed_source === "obd" ? "OBD wheel" : "GPS";
        replaySpeed.textContent = `${source} speed: ${formatSpeed(point.speed)}`;
    }

    function initializeTimeline(points) {
        stopReplay();
        replayPoints = points;
        scrubber.max = Math.max(0, points.length - 1);
        scrubber.value = 0;
        timeline.hidden = points.length === 0;
        if (vehicleMarker) {
            vehicleMarker.remove();
        }
        if (!points.length) {
            vehicleMarker = null;
            return;
        }
        vehicleMarker = L.circleMarker(
            [points[0].latitude, points[0].longitude],
            {
                radius: 8,
                color: "#fff",
                weight: 3,
                fillColor: "#e74a3b",
                fillOpacity: 1,
            }
        ).bindTooltip("Vehicle position").addTo(map);
        showReplayPoint(0);
    }

    async function replayTrip(tripId) {
        error.hidden = true;
        if (replayController) {
            replayController.abort();
        }
        replayController = new AbortController();
        const response = await fetch(
            `/api/trip/${tripId}`,
            { signal: replayController.signal }
        );
        const result = await response.json();
        if (!response.ok) {
            throw new Error(result.error || "Could not load trip route.");
        }

        if (routeLayer) {
            routeLayer.remove();
        }
        if (!map.hasLayer(tiles)) {
            tiles.addTo(map);
        }
        const coordinates = result.points.map(function (point) {
            return [point.latitude, point.longitude];
        });
        routeLayer = L.featureGroup();
        L.polyline(coordinates, { color: "#4e73df", weight: 5 }).addTo(routeLayer);
        if (coordinates.length) {
            L.marker(coordinates[0]).bindPopup("Trip start").addTo(routeLayer);
            L.marker(coordinates[coordinates.length - 1]).bindPopup("Trip end").addTo(routeLayer);
        }
        routeLayer.addTo(map);
        if (coordinates.length > 1) {
            map.fitBounds(routeLayer.getBounds(), { padding: [24, 24] });
        } else if (coordinates.length === 1) {
            map.setView(coordinates[0], 15);
        }
        recenterBtn.hidden = false;
        recenterBtn.onclick = function () {
            if (coordinates.length > 1) {
                map.fitBounds(routeLayer.getBounds(), { padding: [24, 24] });
            } else if (coordinates.length === 1) {
                map.setView(coordinates[0], 15);
            }
        };
        summary.textContent = `${formatDistance(result.trip.distance_km)} · `
            + `${formatDuration(result.trip.duration_seconds)} · `
            + `avg ${formatSpeed(result.trip.average_speed_kmh)} · `
            + `max ${formatSpeed(result.trip.max_speed_kmh)} · `
            + `${result.points.length} route points`;
        initializeTimeline(result.points);
    }

    function renderTrips(trips) {
        body.replaceChildren();
        trips.forEach(function (trip) {
            const row = document.createElement("tr");
            row.dataset.started = trip.start_datetime;
            row.dataset.distance = trip.distance_km;
            row.dataset.duration = trip.duration_seconds;
            row.dataset.maxSpeed = trip.max_speed_kmh;
            row.dataset.tripId = trip.id;
            row.style.cursor = "pointer";
            row.innerHTML = `
                <td>${formatDate(trip.start_datetime)}</td>
                <td>${formatDistance(trip.distance_km)}</td>
                <td>${formatDuration(trip.duration_seconds)}</td>
                <td>${formatSpeed(trip.max_speed_kmh)}</td>
                <td class="text-muted small">${trip.odo_start_km.toFixed(0)} → ${trip.odo_end_km.toFixed(0)} km</td>
                <td class="text-end d-none d-sm-table-cell">
                    <button class="btn btn-sm btn-primary" type="button" data-trip-id="${trip.id}">
                        Replay
                    </button>
                </td>`;
            body.appendChild(row);
        });
    }

    body.addEventListener("click", function (event) {
        // Button click (desktop) or row click (mobile)
        const button = event.target.closest("[data-trip-id]");
        const row = event.target.closest("tr[data-trip-id]");
        const tripId = button ? button.dataset.tripId : (row ? row.dataset.tripId : null);
        if (!tripId) {
            return;
        }
        replayTrip(tripId).catch(function (replayError) {
            if (replayError.name !== "AbortError") {
                showError(replayError.message);
            }
        });
    });

    scrubber.addEventListener("input", function () {
        stopReplay();
        showReplayPoint(Number(scrubber.value));
    });

    playButton.addEventListener("click", function () {
        if (replayTimer) {
            stopReplay();
            return;
        }
        if (Number(scrubber.value) >= replayPoints.length - 1) {
            showReplayPoint(0);
        }
        playButton.innerHTML = '<i class="fas fa-pause" aria-hidden="true"></i>';
        playButton.setAttribute("aria-label", "Pause trip replay");
        replayTimer = window.setInterval(function () {
            const nextIndex = Number(scrubber.value) + 1;
            if (nextIndex >= replayPoints.length) {
                stopReplay();
                return;
            }
            showReplayPoint(nextIndex);
        }, 500);
    });

    fetch("/api/trips")
        .then(function (response) {
            if (!response.ok) {
                throw new Error("Could not load trip history.");
            }
            return response.json();
        })
        .then(function (result) {
            renderTrips(result.trips);
        })
        .catch(function (loadError) {
            showError(loadError.message);
        })
        .finally(function () {
            loading.hidden = true;
        });
}());