{% extends "base.html" %}

{% block head %}
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
    integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY=" crossorigin="" />
<style>
    #map {
        height: 500px;
        width: 100%;
        border-radius: 8px;
        margin-bottom: 20px;
        z-index: 1;
        /* Ensure it stays below navbars if any */
    }

    .metric-card {
        transition: transform 0.2s;
    }

    .metric-card:hover {
        transform: translateY(-5px);
    }
</style>
</style>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
{% endblock %}

{% block content %}
<div class="d-flex justify-content-between align-items-center mb-3">
    <div>
        <h2 id="act-name">Loading...</h2>
        <p class="text-muted mb-0">
            <span id="act-time">-</span> |
            <span id="act-type">-</span> |
            <span id="act-id">#</span>
        </p>
    </div>
    <div>
        <div class="btn-group me-2">
            <a href="#" class="btn btn-outline-secondary disabled" id="nav-prev-type" title="Previous of same type">
                <i class="bi bi-chevron-double-left"></i>
            </a>
            <a href="#" class="btn btn-outline-secondary disabled" id="nav-prev" title="Previous">
                <i class="bi bi-chevron-left"></i>
            </a>
            <a href="#" class="btn btn-outline-secondary disabled" id="nav-next" title="Next">
                <i class="bi bi-chevron-right"></i>
            </a>
            <a href="#" class="btn btn-outline-secondary disabled" id="nav-next-type" title="Next of same type">
                <i class="bi bi-chevron-double-right"></i>
            </a>
        </div>
        <button class="btn btn-outline-secondary" onclick="window.close()">
            <i class="bi bi-x-lg"></i> Close
        </button>
        <button class="btn btn-primary" id="download-btn">
            <i class="bi bi-download"></i> Download
        </button>
        <button class="btn btn-outline-warning" id="refresh-btn" onclick="refreshActivity()">
            <i class="bi bi-arrow-clockwise"></i> Refresh & Match
        </button>
        <button class="btn btn-warning" id="estimate-power-btn" onclick="estimatePower()">
            <i class="bi bi-lightning-fill"></i> Estimate Power
        </button>
        <button class="btn btn-success" id="create-segment-btn" onclick="toggleSegmentMode()">
            <i class="bi bi-bezier2"></i> Create Segment
        </button>
        <a href="/discovery?activity_id={{ activity_id }}" class="btn btn-outline-info" title="Discover Segments">
            <i class="bi bi-search"></i> Discovery
        </a>
    </div>
</div>

<!-- Map Section -->
<div class="card mb-4 shadow-sm">
    <div class="card-body p-0">
        <div id="map"></div>
        <div id="no-map-msg" class="text-center p-5 text-muted" style="display:none;">
            <i class="bi bi-geo-alt-fill" style="font-size: 2rem;"></i>
            <p class="mt-2">No GPS data available for this activity.</p>
        </div>
    </div>
</div>

<!-- Metrics Overview -->
<div class="row g-3 mb-4">
    <div class="col-md-3">
        <div class="card h-100 bg-light">
            <div class="card-body text-center">
                <i class="bi bi-cursor text-primary mb-2" style="font-size: 1.5rem;"></i>
                <h6 class="card-subtitle text-muted mb-1">Distance</h6>
                <h3 class="card-title text-primary" id="metric-dist">-</h3>
            </div>
        </div>
    </div>
    <div class="col-md-3">
        <div class="card h-100 bg-light">
            <div class="card-body text-center">
                <i class="bi bi-stopwatch text-success mb-2" style="font-size: 1.5rem;"></i>
                <h6 class="card-subtitle text-muted mb-1">Duration</h6>
                <h3 class="card-title text-success" id="metric-dur">-</h3>
            </div>
        </div>
    </div>
    <div class="col-md-3">
        <div class="card h-100 bg-light">
            <div class="card-body text-center">
                <i class="bi bi-heart text-danger mb-2" style="font-size: 1.5rem;"></i>
                <h6 class="card-subtitle text-muted mb-1">Avg HR</h6>
                <h3 class="card-title text-danger" id="metric-hr">-</h3>
            </div>
        </div>
    </div>
    <div class="col-md-3">
        <div class="card h-100 bg-light">
            <div class="card-body text-center">
                <i class="bi bi-fire text-warning mb-2" style="font-size: 1.5rem;"></i>
                <h6 class="card-subtitle text-muted mb-1">Calories</h6>
                <h3 class="card-title text-warning" id="metric-cal">-</h3>
            </div>
        </div>
    </div>
</div>

<!-- Detailed Metrics Grid -->
<h4 class="mb-3">Detailed Metrics</h4>
<div class="row g-3">
    <!-- Segments Card -->
    <div class="col-12 mb-4">
        <div class="card">
            <div class="card-header d-flex justify-content-between align-items-center">
                <h5 class="mb-0">Matched Segments</h5>
                <!-- Could trigger re-scan here -->
            </div>
            <div class="card-body p-0">
                <div class="table-responsive">
                    <table class="table table-hover mb-0" id="efforts-table">
                        <thead class="table-light">
                            <tr>
                                <th>Segment</th>
                                <th>Time</th>
                                <th>Awards</th>
                                <th>Rank</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr id="efforts-loading">
                                <td colspan="4" class="text-center text-muted">Loading segments...</td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>

    <!-- Heart Rate -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-danger">
            <div class="card-header bg-danger text-white">Heart Rate</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Average:</span> <strong id="m-avg-hr">-</strong>
                    bpm</div>
                <div class="d-flex justify-content-between"><span>Max:</span> <strong id="m-max-hr">-</strong> bpm</div>
            </div>
        </div>
    </div>

    <!-- Speed/Pace -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-primary">
            <div class="card-header bg-primary text-white">Speed / Pace</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Avg Speed:</span> <strong
                        id="m-avg-spd">-</strong> km/h</div>
                <div class="d-flex justify-content-between"><span>Max Speed:</span> <strong id="m-max-spd">-</strong>
                    km/h</div>
            </div>
        </div>
    </div>

    <!-- Power -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-warning">
            <div class="card-header bg-warning text-dark">Power</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Avg Power:</span> <strong
                        id="m-avg-pwr">-</strong> W</div>
                <div class="d-flex justify-content-between mb-2"><span>Max Power:</span> <strong
                        id="m-max-pwr">-</strong> W</div>
                <div class="d-flex justify-content-between mb-2"><span>Norm Power:</span> <strong
                        id="m-norm-pwr">-</strong> W</div>
                <div class="d-flex justify-content-between"><span>VO2 Max:</span> <strong id="m-vo2">-</strong></div>
            </div>
        </div>
    </div>

    <!-- Elevation -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-success">
            <div class="card-header bg-success text-white">Elevation</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Gain:</span> <strong id="m-ele-gain">-</strong> m
                </div>
                <div class="d-flex justify-content-between"><span>Loss:</span> <strong id="m-ele-loss">-</strong> m
                </div>
            </div>
        </div>
    </div>

    <!-- Training Effect -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-info">
            <div class="card-header bg-info text-white">Training Effect</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Aerobic:</span> <strong id="m-aerobic">-</strong>
                </div>
                <div class="d-flex justify-content-between mb-2"><span>Anaerobic:</span> <strong
                        id="m-anaerobic">-</strong></div>
                <div class="d-flex justify-content-between"><span>TSS:</span> <strong id="m-tss">-</strong></div>
            </div>
        </div>
    </div>

    <!-- Cadence -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-secondary">
            <div class="card-header bg-secondary text-white">Cadence</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Avg:</span> <strong id="m-avg-cad">-</strong>
                </div>
                <div class="d-flex justify-content-between"><span>Max:</span> <strong id="m-max-cad">-</strong></div>
            </div>
        </div>
    </div>

    <!-- Respiration -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-info">
            <div class="card-header bg-info text-white">Respiration</div>
            <div class="card-body">
                <div class="d-flex justify-content-between mb-2"><span>Avg:</span> <strong id="m-avg-resp">-</strong>
                    br/min</div>
                <div class="d-flex justify-content-between"><span>Max:</span> <strong id="m-max-resp">-</strong> br/min
                </div>
            </div>
        </div>
    </div>

    <!-- Bike Info (New) -->
    <div class="col-md-4">
        <div class="card h-100 metric-card border-light shadow-sm">
            <div class="card-header bg-light text-dark d-flex justify-content-between align-items-center">
                <span>Bike Setup</span>
                <button class="btn btn-sm btn-link p-0 text-decoration-none" onclick="editBikeSetup()">Edit</button>
            </div>
            <div class="card-body">
                <div id="m-bike-info" class="text-center text-muted">No Setup</div>
            </div>
        </div>
    </div>
</div>

<!-- Charts Section -->
<div class="row g-3 mb-4">
    <div class="col-12">
        <div class="card shadow-sm">
            <div class="card-header d-flex justify-content-between align-items-center">
                <span class="h5 mb-0">Activity Streams</span>
                <div class="d-flex align-items-center">
                    <div class="form-check form-switch me-3">
                        <input class="form-check-input" type="checkbox" id="smooth-toggle" onchange="toggleSmoothing()">
                        <label class="form-check-label" for="smooth-toggle">Smooth Data</label>
                    </div>
                    <button class="btn btn-sm btn-outline-primary" onclick="openChartModal()">
                        <i class="bi bi-arrows-fullscreen"></i> Full Screen
                    </button>
                </div>
            </div>
            <div class="card-body p-4">
                <div class="d-flex justify-content-between align-items-center mb-4">
                    <div>
                        <h4 class="card-title fw-bold mb-1">Cycling Workout Analysis</h4>
                        <p class="text-muted small mb-0">Toggle metrics to customize view</p>
                    </div>
                    <div class="d-flex align-items-center gap-2">
                        <div class="form-check form-switch me-3">
                            <input class="form-check-input" type="checkbox" id="smooth-toggle"
                                onchange="toggleSmoothing()">
                            <label class="form-check-label" for="smooth-toggle">Smooth</label>
                        </div>
                        <button class="btn btn-sm btn-outline-secondary" onclick="openChartModal()">
                            <i class="bi bi-arrows-fullscreen"></i>
                        </button>
                    </div>
                </div>

                <!-- Metric Toggles -->
                <div class="d-flex flex-wrap gap-2 mb-4" id="chart-toggles">
                    <!-- Buttons injected by JS -->
                </div>

                <!-- Chart -->
                <div style="height: 600px; position: relative;">
                    <canvas id="streams-chart"></canvas>
                </div>

                <!-- Summary Footer -->
                <div class="row g-3 mt-4 pt-4 border-top" id="chart-footer">
                    <!-- Stats injected by JS -->
                </div>
            </div>
        </div>
    </div>
</div>

<!-- Full Screen Chart Modal -->
<div class="modal fade" id="chartModal" tabindex="-1">
    <div class="modal-dialog modal-fullscreen">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Activity Streams (Full Screen)</h5>
                <div class="d-flex align-items-center">
                    <div class="form-check form-switch me-3">
                        <input class="form-check-input" type="checkbox" id="modal-smooth-toggle"
                            onchange="toggleModalSmoothing()">
                        <label class="form-check-label" for="modal-smooth-toggle">Smooth Data</label>
                    </div>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
            </div>
            <div class="modal-body bg-light">
                <div class="card h-100 shadow-sm">
                    <div class="card-body">
                        <div style="height: 100%; width: 100%;">
                            <canvas id="modal-chart"></canvas>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

{% endblock %}

{% block scripts %}
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"
    integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo=" crossorigin=""></script>
<script>
    const activityId = "{{ activity_id }}";
    let map = null;

    document.addEventListener('DOMContentLoaded', async () => {
        // Init Map
        map = L.map('map').setView([0, 0], 2);
        L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
            attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
        }).addTo(map);

        await loadDetails();
        await loadMapData();

        document.getElementById('download-btn').onclick = () => {
            window.location.href = `/api/activities/download/${activityId}`;
        };

        loadNavigation();
        loadCharts();
    });

    async function loadNavigation() {
        try {
            const res = await fetch(`/api/activities/${activityId}/navigation`);
            if (res.ok) {
                const nav = await res.json();

                function setBtn(id, targetId) {
                    const el = document.getElementById(id);
                    if (targetId) {
                        el.href = `/activity/${targetId}`;
                        el.classList.remove('disabled');
                    }
                }

                setBtn('nav-prev', nav.prev_id);
                setBtn('nav-next', nav.next_id);
                setBtn('nav-prev-type', nav.prev_type_id);
                setBtn('nav-next-type', nav.next_type_id);
            }
        } catch (e) { console.error("Nav load failed", e); }
    }

    let chartInstance = null;
    let modalChartInstance = null;
    let streamData = null; // Store fetched data

    async function loadCharts() {
        try {
            const res = await fetch(`/api/activities/${activityId}/streams`);
            if (!res.ok) return;
            const data = await res.json();

            if (!data.time || data.time.length === 0) return;
            streamData = data; // Cache for modal

            renderChart('streams-chart', data);
            renderToggles();
            renderFooter(data);

        } catch (e) {
            console.error("Chart load failed", e);
        }
    }

    let isSmoothingEnabled = false;

    // Visibility state (managed manually to sync custom buttons with chart)
    let metricVisibility = {
        heart_rate: true,
        speed: true,
        power: true,
        altitude: false, // Match user preference
        cadence: false,
        respiration_rate: false
    };

    const metricConfig = {
        heart_rate: { label: 'Heart Rate', icon: '❤️', color: '#ef4444' },
        speed: { label: 'Speed', icon: '🚴', color: '#3b82f6' },
        power: { label: 'Power', icon: '⚡', color: '#f97316' },
        altitude: { label: 'Elevation', icon: '⛰️', color: '#16a34a' },
        cadence: { label: 'Cadence', icon: '🔄', color: '#a855f7' },
        respiration_rate: { label: 'Resp', icon: '🫁', color: '#0dcaf0' }
    };

    function toggleMetric(key) {
        metricVisibility[key] = !metricVisibility[key];
        renderToggles();
        if (chartInstance) updateChartVisibility(chartInstance);
        if (modalChartInstance) updateChartVisibility(modalChartInstance);
    }

    function renderToggles() {
        const container = document.getElementById('chart-toggles');
        if (!container) return;

        let html = '';
        Object.keys(metricConfig).forEach(key => {
            // Only show toggle if data exists
            if (streamData && streamData[key] && streamData[key].some(x => x)) {
                const cfg = metricConfig[key];
                const active = metricVisibility[key];
                const bg = active ? cfg.color : '#e5e7eb';
                const fg = active ? 'white' : '#4b5563';
                const shadow = active ? '0 4px 6px rgba(0,0,0,0.1)' : 'none';

                html += `<button onclick="toggleMetric('${key}')" style="
                    padding: 8px 16px;
                    border-radius: 20px;
                    font-size: 14px;
                    font-weight: 500;
                    border: none;
                    cursor: pointer;
                    background-color: ${bg};
                    color: ${fg};
                    box-shadow: ${shadow};
                    transition: all 0.2s;
                ">${cfg.icon} ${cfg.label}</button>`;
            }
        });
        container.innerHTML = html;
    }

    function renderFooter(data) {
        const container = document.getElementById('chart-footer');
        if (!container) return;

        function avg(arr) {
            const valid = arr.filter(x => x !== null);
            return valid.length ? (valid.reduce((a, b) => a + b, 0) / valid.length) : 0;
        }

        const stats = [];
        if (data.heart_rate) stats.push({ label: 'Avg HR', val: Math.round(avg(data.heart_rate)) + ' bpm', color: metricConfig.heart_rate.color });
        if (data.speed) stats.push({ label: 'Avg Speed', val: (avg(data.speed) * 3.6).toFixed(1) + ' km/h', color: metricConfig.speed.color });
        if (data.power) stats.push({ label: 'Avg Power', val: Math.round(avg(data.power)) + ' W', color: metricConfig.power.color });

        // Elevation Gain (Approx)
        if (data.altitude) {
            let gain = 0;
            for (let i = 1; i < data.altitude.length; i++) {
                if (data.altitude[i] > data.altitude[i - 1]) gain += (data.altitude[i] - data.altitude[i - 1]);
            }
            stats.push({ label: 'Total Climb', val: Math.round(gain) + ' m', color: metricConfig.altitude.color });
        }

        if (data.cadence) stats.push({ label: 'Avg Cadence', val: Math.round(avg(data.cadence)) + ' rpm', color: metricConfig.cadence.color });

        container.innerHTML = stats.map(s => `
            <div class="col-md-2 text-center">
                <p style="font-size: 12px; color: #6b7280; margin-bottom: 4px;">${s.label}</p>
                <p style="font-size: 18px; font-weight: bold; color: ${s.color}; margin: 0;">${s.val}</p>
            </div>
        `).join('');
    }

    function updateChartVisibility(chart) {
        chart.data.datasets.forEach(ds => {
            ds.hidden = !metricVisibility[ds.rawKey];
        });
        chart.update();
    }

    function toggleSmoothing() {
        isSmoothingEnabled = document.getElementById('smooth-toggle').checked;
        const modalToggle = document.getElementById('modal-smooth-toggle');
        if (modalToggle) modalToggle.checked = isSmoothingEnabled;
        if (streamData) {
            renderChart('streams-chart', streamData);
            if (modalChartInstance) renderChart('modal-chart', streamData, true);
        }
    }

    function toggleModalSmoothing() {
        isSmoothingEnabled = document.getElementById('modal-smooth-toggle').checked;
        const mainToggle = document.getElementById('smooth-toggle');
        if (mainToggle) mainToggle.checked = isSmoothingEnabled;
        if (streamData) renderChart('modal-chart', streamData, true);
    }

    function movingAverage(data, windowSize) {
        if (!data || data.length === 0) return [];
        const result = [];
        for (let i = 0; i < data.length; i++) {
            let sum = 0;
            let count = 0;
            const offset = Math.floor(windowSize / 2);
            for (let j = i - offset; j < i - offset + windowSize; j++) {
                if (j >= 0 && j < data.length && data[j] !== null) {
                    sum += data[j];
                    count++;
                }
            }
            result.push(count > 0 ? sum / count : null);
        }
        return result;
    }

    function openChartModal() {
        if (!streamData) return;
        const mt = document.getElementById('modal-smooth-toggle');
        if (mt) mt.checked = isSmoothingEnabled;

        const modal = new bootstrap.Modal(document.getElementById('chartModal'));
        modal.show();

        document.getElementById('chartModal').addEventListener('shown.bs.modal', () => {
            renderChart('modal-chart', streamData, true);
        }, { once: true });
    }

    function renderChart(canvasId, rawData, isModal = false) {
        const ctx = document.getElementById(canvasId).getContext('2d');

        if (canvasId === 'streams-chart' && chartInstance) { chartInstance.destroy(); chartInstance = null; }
        else if (canvasId === 'modal-chart' && modalChartInstance) { modalChartInstance.destroy(); modalChartInstance = null; }

        const data = { ...rawData };
        if (isSmoothingEnabled) {
            const window = 10;
            Object.keys(metricConfig).forEach(k => {
                if (data[k]) data[k] = movingAverage(data[k], window);
            });
        }

        const datasets = [];
        const commonOptions = { pointRadius: 0, borderWidth: 2, tension: 0.4 };

        if (data.heart_rate && data.heart_rate.some(x => x)) {
            datasets.push({
                ...commonOptions,
                label: 'Heart Rate',
                rawKey: 'heart_rate',
                data: data.heart_rate,
                borderColor: metricConfig.heart_rate.color,
                backgroundColor: metricConfig.heart_rate.color,
                yAxisID: 'left',
                borderWidth: 2.5,
                hidden: !metricVisibility.heart_rate
            });
        }

        if (data.speed && data.speed.some(x => x)) {
            datasets.push({
                ...commonOptions,
                label: 'Speed',
                rawKey: 'speed',
                data: data.speed.map(s => s ? s * 3.6 : null),
                borderColor: metricConfig.speed.color,
                backgroundColor: metricConfig.speed.color,
                yAxisID: 'right',
                hidden: !metricVisibility.speed
            });
        }

        if (data.power && data.power.some(x => x)) {
            datasets.push({
                ...commonOptions,
                label: 'Power',
                rawKey: 'power',
                data: data.power,
                borderColor: metricConfig.power.color,
                backgroundColor: metricConfig.power.color,
                yAxisID: 'right',
                hidden: !metricVisibility.power
            });
        }

        if (data.altitude && data.altitude.some(x => x)) {
            datasets.push({
                ...commonOptions,
                label: 'Elevation',
                rawKey: 'altitude',
                data: data.altitude,
                borderColor: metricConfig.altitude.color,
                backgroundColor: metricConfig.altitude.color,
                yAxisID: 'right',
                borderWidth: 2,
                hidden: !metricVisibility.altitude
            });
        }

        if (data.cadence && data.cadence.some(x => x)) {
            datasets.push({
                ...commonOptions,
                label: 'Cadence',
                rawKey: 'cadence',
                data: data.cadence,
                borderColor: metricConfig.cadence.color,
                backgroundColor: metricConfig.cadence.color,
                yAxisID: 'left',
                borderDash: [5, 5],
                borderWidth: 1.5,
                hidden: !metricVisibility.cadence
            });
        }

        if (data.respiration_rate && data.respiration_rate.some(x => x)) {
            datasets.push({
                ...commonOptions,
                label: 'Respiration',
                rawKey: 'respiration_rate',
                data: data.respiration_rate,
                borderColor: metricConfig.respiration_rate.color,
                backgroundColor: metricConfig.respiration_rate.color,
                yAxisID: 'left',
                hidden: !metricVisibility.respiration_rate
            });
        }

        const labels = data.time.map(t => {
            const h = Math.floor(t / 3600);
            const m = Math.floor((t % 3600) / 60);
            return h > 0 ? `${h}h${m}m` : `${m}m`;
        });

        const newChart = new Chart(ctx, {
            type: 'line',
            data: { labels, datasets },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                interaction: { mode: 'index', intersect: false },
                plugins: {
                    legend: { display: false }, // Using custom toggles
                    tooltip: {
                        backgroundColor: 'white',
                        titleColor: '#374151',
                        bodyColor: '#4b5563',
                        borderColor: '#d1d5db',
                        borderWidth: 1,
                        padding: 12,
                        boxPadding: 4,
                        callbacks: {
                            labelColor: function (context) {
                                return {
                                    borderColor: context.dataset.borderColor,
                                    backgroundColor: context.dataset.borderColor
                                };
                            }
                        }
                    }
                },
                scales: {
                    x: {
                        ticks: { maxTicksLimit: isModal ? 20 : 10, maxRotation: 0 },
                        grid: { display: true, drawOnChartArea: true, drawTicks: true, color: '#f3f4f6' }
                    },
                    left: {
                        type: 'linear',
                        position: 'left',
                        grid: { display: true, color: '#e5e7eb', borderDash: [3, 3] },
                        min: 0
                    },
                    right: {
                        type: 'linear',
                        position: 'right',
                        grid: { display: false },
                        min: 0
                    }
                }
            }
        });

        if (canvasId === 'streams-chart') chartInstance = newChart;
        else if (canvasId === 'modal-chart') modalChartInstance = newChart;
    }

    async function loadDetails() {
        try {
            const res = await fetch(`/api/activities/${activityId}/details`);
            if (!res.ok) throw new Error("Failed to load details");
            const data = await res.json();
            window.currentDbId = data.id; // Store for segment creation
            window.currentActivityType = data.activity_type;

            // Header
            document.getElementById('act-name').textContent = data.activity_name || 'Untitled Activity';
            document.getElementById('act-time').textContent = new Date(data.start_time).toLocaleString();
            document.getElementById('act-type').textContent = data.activity_type;
            document.getElementById('act-id').textContent = data.garmin_activity_id;

            // Overview Cards
            document.getElementById('metric-dist').textContent = data.distance ? (data.distance / 1000).toFixed(2) + ' km' : '-';
            document.getElementById('metric-dur').textContent = formatDuration(data.duration);
            document.getElementById('metric-hr').textContent = data.avg_hr ? data.avg_hr + ' bpm' : '-';
            document.getElementById('metric-cal').textContent = data.calories || '-';

            // Detail Cards
            // HR
            document.getElementById('m-avg-hr').textContent = data.avg_hr || '-';
            document.getElementById('m-max-hr').textContent = data.max_hr || '-';
            // Speed
            document.getElementById('m-avg-spd').textContent = data.avg_speed ? (data.avg_speed * 3.6).toFixed(1) : '-';
            document.getElementById('m-max-spd').textContent = data.max_speed ? (data.max_speed * 3.6).toFixed(1) : '-';
            // Power
            document.getElementById('m-avg-pwr').textContent = data.avg_power || '-';
            document.getElementById('m-max-pwr').textContent = data.max_power || '-';
            document.getElementById('m-norm-pwr').textContent = data.norm_power || '-';
            document.getElementById('m-vo2').textContent = data.vo2_max || '-';
            // Elevation
            document.getElementById('m-ele-gain').textContent = data.elevation_gain || '-';
            document.getElementById('m-ele-loss').textContent = data.elevation_loss || '-';
            // TE
            document.getElementById('m-aerobic').textContent = data.aerobic_te || '-';
            document.getElementById('m-anaerobic').textContent = data.anaerobic_te || '-';
            document.getElementById('m-tss').textContent = data.tss || '-';
            // Cadence
            document.getElementById('m-avg-cad').textContent = data.avg_cadence || '-';
            document.getElementById('m-max-cad').textContent = data.max_cadence || '-';
            // Respiration
            document.getElementById('m-avg-resp').textContent = data.avg_respiration_rate ? data.avg_respiration_rate.toFixed(1) : '-';
            document.getElementById('m-max-resp').textContent = data.max_respiration_rate ? data.max_respiration_rate.toFixed(1) : '-';

            // Bike
            if (data.bike_setup) {
                const b = data.bike_setup;
                const txt = b.name ? `<strong>${b.name}</strong><br>${b.frame} ${b.chainring}/${b.rear_cog}` : `${b.frame} ${b.chainring}/${b.rear_cog}`;
                document.getElementById('m-bike-info').innerHTML = txt;
            }

            // Load Efforts
            if (window.currentDbId) {
                loadEfforts(window.currentDbId);
            }

        } catch (e) {
            console.error(e);
            showToast("Error", "Failed to load activity details", "error");
        }
    }

    async function loadMapData() {
        try {
            const res = await fetch(`/api/activities/${activityId}/geojson`);
            if (res.ok) {
                const geojson = await res.json();
                if (geojson.features && geojson.features.length > 0 && geojson.features[0].geometry.coordinates.length > 0) {
                    // GeoJSON coords are [lon, lat]. Leaflet wants [lat, lon]
                    const coords = geojson.features[0].geometry.coordinates;
                    trackPoints = coords.map(p => [p[1], p[0]]);

                    const layer = L.geoJSON(geojson, {
                        style: { color: 'red', weight: 4, opacity: 0.7 }
                    }).addTo(map);
                    map.fitBounds(layer.getBounds());
                } else {
                    document.getElementById('map').style.display = 'none';
                    document.getElementById('no-map-msg').style.display = 'block';
                }
            } else {
                throw new Error("Failed to load map data");
            }
        } catch (e) {
            console.error(e);
            document.getElementById('map').style.display = 'none';
            document.getElementById('no-map-msg').style.display = 'block';
            document.getElementById('no-map-msg').querySelector('p').textContent = "Map data unavailable.";
        }
    }

    function formatDuration(s) { if (!s) return '-'; const h = Math.floor(s / 3600), m = Math.floor((s % 3600) / 60), sec = s % 60; return `${h}h ${m}m ${sec}s`; }

    // Segment Creation Logic
    let segmentMode = false;
    let startMarker = null;
    let endMarker = null;
    let trackPoints = []; // List of [lat, lon] from GeoJSON
    let startIndex = 0;
    let endIndex = 0;

    function toggleSegmentMode() {
        segmentMode = !segmentMode;
        const btn = document.getElementById('create-segment-btn');
        if (segmentMode) {
            btn.classList.add('active');
            btn.innerHTML = '<i class="bi bi-check-lg"></i> Save Segment';
            btn.onclick = saveSegment;
            initSegmentMarkers();
        } else {
            // Cancelled
            btn.classList.remove('active');
            btn.innerHTML = '<i class="bi bi-bezier2"></i> Create Segment';
            btn.onclick = toggleSegmentMode;
            removeSegmentMarkers();
        }
    }

    function removeSegmentMarkers() {
        if (startMarker) map.removeLayer(startMarker);
        if (endMarker) map.removeLayer(endMarker);
        startMarker = null;
        endMarker = null;
    }

    function initSegmentMarkers() {
        if (trackPoints.length < 2) {
            alert("Not enough points to create a segment.");
            toggleSegmentMode();
            return;
        }

        // Default positions: 20% and 80%
        startIndex = Math.floor(trackPoints.length * 0.2);
        endIndex = Math.floor(trackPoints.length * 0.8);

        const startIcon = L.divIcon({ className: 'bg-success rounded-circle border border-white', iconSize: [12, 12] });
        const endIcon = L.divIcon({ className: 'bg-danger rounded-circle border border-white', iconSize: [12, 12] });

        startMarker = L.marker(trackPoints[startIndex], { draggable: true, icon: startIcon }).addTo(map);
        endMarker = L.marker(trackPoints[endIndex], { draggable: true, icon: endIcon }).addTo(map);

        // Snap logic
        function setupDrag(marker, isStart) {
            marker.on('drag', function (e) {
                const ll = e.latlng;
                let closestDist = Infinity;
                let closestIdx = -1;
                // Simple snap for visual feedback during drag
                for (let i = 0; i < trackPoints.length; i++) {
                    const d = map.distance(ll, trackPoints[i]);
                    if (d < closestDist) {
                        closestDist = d;
                        closestIdx = i;
                    }
                }
                // Optional: visual snap? Leaflet handles drag msg.
            });

            marker.on('dragend', function (e) {
                const ll = e.target.getLatLng();
                let closestDist = Infinity;
                let closestIdx = -1;

                // constrain search
                let searchStart = 0;
                let searchEnd = trackPoints.length;

                if (isStart) {
                    // Start marker: can search 0 to trackPoints.length
                    // Heuristic: If we are modifying Start, look for points < endIndex (if valid).
                    if (endIndex > 0) searchEnd = endIndex;
                } else {
                    // End marker
                    if (startIndex >= 0) searchStart = startIndex;
                }

                // "Stickiness" logic
                const currentIndex = isStart ? startIndex : endIndex;
                const indexPenalty = 0.0001;

                for (let i = searchStart; i < searchEnd; i++) {
                    const d_spatial = map.distance(ll, trackPoints[i]);
                    const d_index = Math.abs(i - currentIndex);

                    const score = d_spatial + (d_index * indexPenalty);

                    if (score < closestDist) {
                        closestDist = score;
                        closestIdx = i;
                    }
                }

                if (closestIdx !== -1) {
                    marker.setLatLng(trackPoints[closestIdx]);
                    if (isStart) startIndex = closestIdx;
                    else endIndex = closestIdx;
                }
            });
        }

        setupDrag(startMarker, true);
        setupDrag(endMarker, false);
    }

    async function refreshActivity() {
        if (!confirm("Are you sure you want to re-download this activity from Garmin and run bike matching? This will overwrite any manual bike selection.")) {
            return;
        }

        const btn = document.getElementById('refresh-btn');
        const origHtml = btn.innerHTML;
        btn.disabled = true;
        btn.innerHTML = '<span class="spinner-border spinner-border-sm"></span> Refreshing...';

        // Helper toast fallback if showToast not defined in this view (it inherits from base.html usually?)
        // base.html usually has showToast. 
        if (typeof showToast === 'function') showToast("Processing...", "Refreshing activity data...", "info");

        try {
            const res = await fetch(`/api/activities/${activityId}/redownload`, { method: 'POST' });
            const data = await res.json();

            if (res.ok) {
                if (typeof showToast === 'function') showToast("Success", data.message, "success");
                else alert(data.message);

                // Reload details
                loadDetails();
                loadCharts();
            } else {
                throw new Error(data.detail || "Refresh failed");
            }
        } catch (e) {
            console.error(e);
            if (typeof showToast === 'function') showToast("Error", e.message, "error");
            else alert("Error: " + e.message);
        } finally {
            btn.disabled = false;
            btn.innerHTML = origHtml;
        }
    }

    let allBikes = [];
    async function fetchAllBikes() {
        try {
            const res = await fetch('/api/bike-setups');
            if (res.ok) allBikes = await res.json();
        } catch (e) { console.error(e); }
    }
    document.addEventListener('DOMContentLoaded', fetchAllBikes);

    function editBikeSetup() {
        const container = document.getElementById('m-bike-info');
        if (container.querySelector('select')) return;

        // Current text
        const currentHtml = container.innerHTML;

        let initialSelect = `<div class="input-group input-group-sm">
            <select class="form-select" id="bike-select">
                <option value="">-- No Bike --</option>`;

        allBikes.forEach(b => {
            initialSelect += `<option value="${b.id}">${b.name || b.frame} (${b.chainring}/${b.rear_cog})</option>`;
        });

        initialSelect += `</select>
            <button class="btn btn-success" onclick="saveBikeSetup()"><i class="bi bi-check"></i></button>
            <button class="btn btn-outline-secondary" onclick="loadDetails()"><i class="bi bi-x"></i></button>
        </div>`;

        container.innerHTML = initialSelect;
    }

    async function saveBikeSetup() {
        const sel = document.getElementById('bike-select');
        const newId = sel.value ? parseInt(sel.value) : null;

        try {
            const res = await fetch(`/api/activities/${activityId}/bike`, {
                method: 'PUT',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ bike_setup_id: newId, manual_override: true })
            });

            if (res.ok) {
                if (typeof showToast === 'function') showToast("Success", "Bike setup updated", "success");
                else alert("Bike setup updated");
                loadDetails();
            } else {
                const err = await res.json();
                alert("Error: " + err.detail);
            }
        } catch (e) {
            console.error(e);
            alert("Save failed");
        }
    }

    async function estimatePower() {
        if (!confirm("Estimate power for this activity using physics usage calculation? This will update average/max power stats.")) return;

        const btn = document.getElementById('estimate-power-btn');
        const origText = btn.innerHTML;
        btn.disabled = true;
        btn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> Estimating...';

        try {
            const res = await fetch(`/api/activities/${window.currentDbId}/estimate_power`, {
                method: 'POST'
            });

            if (res.ok) {
                const data = await res.json();
                alert("Power estimation complete! Avg: " + data.stats.avg_power + " W");
                loadDetails(); // Refresh stats
                loadCharts(); // Refresh charts if stream updated (Service returns stream but we'd need to reload)
            } else {
                const err = await res.json();
                alert("Error: " + err.detail);
            }
        } catch (e) {
            console.error(e);
            alert("Estimate failed: " + e.message);
        } finally {
            btn.disabled = false;
            btn.innerHTML = origText;
        }
    }

    async function saveSegment() {
        if (startIndex >= endIndex) {
            alert("Start point must be before End point.");
            return;
        }

        const name = prompt("Enter Segment Name:");
        if (!name) return;

        try {
            const res = await fetch('/api/segments/create', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    name: name,
                    activity_id: window.currentDbId,
                    activity_type: window.currentActivityType,
                    start_index: startIndex,
                    end_index: endIndex
                })
            });

            if (res.ok) {
                alert("Segment created!");
                toggleSegmentMode(); // Reset UI
            } else {
                const err = await res.json();
                alert("Error: " + err.detail);
            }
            // Load Segments
            loadEfforts(window.currentDbId);

        } catch (e) {
            console.error(e);
            alert("Error loading activity: " + e.message);
        }
    }

    async function loadEfforts(dbId) {
        const tbody = document.querySelector('#efforts-table tbody');
        try {
            const res = await fetch(`/api/activities/${dbId}/efforts`);
            if (res.ok) {
                const efforts = await res.json();
                tbody.innerHTML = '';
                if (efforts.length === 0) {
                    tbody.innerHTML = '<tr><td colspan="4" class="text-center text-muted">No segments matched.</td></tr>';
                    return;
                }

                efforts.forEach(eff => {
                    const tr = document.createElement('tr');
                    let awards = '';
                    if (eff.is_kom) awards += '<span class="badge bg-warning text-dark me-1"><i class="bi bi-trophy-fill"></i> CR</span>';
                    if (eff.is_pr) awards += '<span class="badge bg-success me-1"><i class="bi bi-award-fill"></i> PR</span>';

                    tr.innerHTML = `
                        <td><strong>${eff.segment_name}</strong></td>
                        <td>${formatDuration(eff.elapsed_time)}</td>
                        <td>${awards}</td>
                        <td>${eff.kom_rank ? '#' + eff.kom_rank : '-'}</td>
                     `;
                    tbody.appendChild(tr);
                });
            } else {
                tbody.innerHTML = '<tr><td colspan="4" class="text-center text-muted">Failed to load segments.</td></tr>';
            }
        } catch (e) {
            tbody.innerHTML = '<tr><td colspan="4" class="text-center text-muted">Error loading segments.</td></tr>';
        }
    }

    // Leaflet Map Init
</script>
{% endblock %}