const scriptPath = document.currentScript ? document.currentScript.src : window.location.href;
const API_BASE = scriptPath.substring(0, scriptPath.lastIndexOf('/') + 1) + 'api/';

// Store device info globally to simplify reload
let filteredDevices = [];
// Grouped: { "ControllerName": [ {dev info...}, {dev info...} ] }
let groupedDevices = {};
let currentRange = 'day';
let chartInstances = {};

async function init() {
    setupControls();
    await loadDevices();
}

function setupControls() {
    // Range Buttons
    document.querySelectorAll('.range-btn').forEach(btn => {
        btn.addEventListener('click', (e) => {
            document.querySelectorAll('.range-btn').forEach(b => b.classList.remove('active'));
            e.target.classList.add('active');
            currentRange = e.target.dataset.range;
            loadData();
        });
    });
}

/**
 * Fetch and setup device containers (Grouped by Controller)
 */
async function loadDevices() {
    try {
        const res = await fetch(`${API_BASE}devices`);
        const rawDevices = await res.json();
        const container = document.getElementById('devicesContainer');
        container.innerHTML = '';

        if (rawDevices.length === 0) {
            container.innerHTML = '<p>No devices found.</p>';
            return;
        }

        // Group by Controller Name
        groupedDevices = rawDevices.reduce((acc, dev) => {
            if (!acc[dev.dev_name]) acc[dev.dev_name] = [];
            acc[dev.dev_name].push(dev);
            return acc;
        }, {});

        // Create Section per Controller
        for (const [controllerName, ports] of Object.entries(groupedDevices)) {
            const safeControllerName = controllerName.replace(/\s+/g, '_');

            const section = document.createElement('div');
            section.className = 'controller-section';

            // Generate Ports HTML
            let portsHtml = '';
            ports.forEach(port => {
                const safePortId = `${controllerName}_${port.port}`.replace(/\s+/g, '_');
                const isLight = port.port_name && port.port_name.toLowerCase().includes('light');
                const levelTitle = isLight ? 'Brightness' : 'Fan Speed';

                portsHtml += `
                    <div class="port-card">
                        <h4>${port.port_name || 'Port ' + port.port}</h4>
                        <div class="canvas-container small">
                            <canvas id="level_${safePortId}"></canvas>
                        </div>
                    </div>
                `;
            });

            section.innerHTML = `
                <div class="controller-header">
                    <h2>${controllerName}</h2>
                </div>
                
                <div class="environment-row">
                    <div class="chart-wrapper wide">
                        <h3>Environment (Temp / Humidity)</h3>
                        <div class="canvas-container">
                            <canvas id="env_${safeControllerName}"></canvas>
                        </div>
                    </div>
                </div>

                <div class="ports-grid">
                    ${portsHtml}
                </div>
            `;
            container.appendChild(section);
        }

        // Trigger initial data load
        loadData();

    } catch (err) {
        console.error("Failed to load devices", err);
    }
}

/**
 * Fetch data and render
 */
async function loadData() {
    for (const [controllerName, ports] of Object.entries(groupedDevices)) {
        const safeControllerName = controllerName.replace(/\s+/g, '_');

        // 1. Fetch Environment Data (Use first port as representative source)
        if (ports.length > 0) {
            const firstPort = ports[0];
            try {
                const res = await fetch(`${API_BASE}history?devName=${encodeURIComponent(controllerName)}&port=${firstPort.port}&range=${currentRange}`);
                const data = await res.json();
                renderEnvChart(safeControllerName, data);
            } catch (err) {
                console.error(`Failed to load env data for ${controllerName}`, err);
            }
        }

        // 2. Fetch Level Data for EACH port
        for (const port of ports) {
            const safePortId = `${controllerName}_${port.port}`.replace(/\s+/g, '_');
            try {
                const res = await fetch(`${API_BASE}history?devName=${encodeURIComponent(controllerName)}&port=${port.port}&range=${currentRange}`);
                const data = await res.json();

                const isLight = port.port_name && port.port_name.toLowerCase().includes('light');
                renderLevelChart(safePortId, data, isLight);
            } catch (err) {
                console.error(`Failed to load level data for ${controllerName}:${port.port}`, err);
            }
        }
    }
}

function renderEnvChart(safeName, data) {
    const labels = data.map(d => new Date(d.timestamp).toLocaleString());
    const ctx = document.getElementById(`env_${safeName}`).getContext('2d');

    updateChart(`env_${safeName}`, ctx, labels, [
        {
            label: 'Temperature (°C)',
            data: data.map(d => d.temp_c),
            borderColor: '#ff6384',
            yAxisID: 'y'
        },
        {
            label: 'Humidity (%)',
            data: data.map(d => d.humidity),
            borderColor: '#36a2eb',
            yAxisID: 'y1'
        }
    ], {
        scales: {
            y: {
                type: 'linear',
                display: true,
                position: 'left',
                suggestedMin: 15,
                title: { display: true, text: 'Temp (°C)' }
            },
            y1: {
                type: 'linear',
                display: true,
                position: 'right',
                grid: { drawOnChartArea: false },
                suggestedMin: 30,
                suggestedMax: 80,
                title: { display: true, text: 'Humidity (%)' }
            }
        }
    });
}

function renderLevelChart(safeId, data, isLight) {
    const labels = data.map(d => new Date(d.timestamp).toLocaleString());
    const ctx = document.getElementById(`level_${safeId}`).getContext('2d');
    const levelLabel = isLight ? 'Brightness' : 'Fan Speed';
    const levelColor = isLight ? '#ffcd56' : '#9966ff';

    updateChart(`level_${safeId}`, ctx, labels, [{
        label: levelLabel,
        data: data.map(d => d.fan_speed),
        borderColor: levelColor,
        backgroundColor: levelColor,
        stepped: true
    }], {
        scales: {
            y: {
                suggestedMin: 0,
                suggestedMax: 10,
                ticks: { stepSize: 1 }
            }
        }
    });
}

function updateChart(id, ctx, labels, datasets, extraOptions = {}) {
    if (chartInstances[id]) {
        chartInstances[id].destroy();
    }

    chartInstances[id] = new Chart(ctx, {
        type: 'line',
        data: {
            labels: labels,
            datasets: datasets.map(ds => ({ ...ds, borderWidth: 2, tension: 0.3, pointRadius: 1 }))
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            interaction: {
                mode: 'index',
                intersect: false,
            },
            plugins: {
                legend: { position: 'top' }
            },
            ...extraOptions
        }
    });
}

document.addEventListener('DOMContentLoaded', init);