const chartInstances = {};

async function loadPieChart(endpoint, canvasId, legendId) {
    try {
        const res = await fetch(endpoint);
        if (!res.ok) throw new Error(`HTTP ${res.status}`);
        const json = await res.json();

        const canvas = document.getElementById(canvasId);
        const legend = document.getElementById(legendId);

        if (!json.top || json.top.length === 0) {
            legend.innerHTML = "<p>Geen data ontvangen.</p>";
            return;
        }

        const totalPercent = json.top.reduce((sum, item) => sum + item.percent, 0);
        let topData = [...json.top];
        if (totalPercent < 100) {
            topData.push({ name: "Other", percent: 100 - totalPercent });
        }

        const labels = topData.map(item => item.name);
        const data = topData.map(item => item.percent);
        const colors = labels.map((label, i) =>
            label === "Other" ? "#888888" : `hsl(${i * 57 % 360}, 70%, 60%)`
        );

        if (!chartInstances[canvasId]) {
            const ctx = canvas.getContext("2d");
            chartInstances[canvasId] = new Chart(ctx, {
                type: "pie",
                data: {
                    labels,
                    datasets: [{
                        data,
                        backgroundColor: colors
                    }]
                },
                options: {
                    responsive: true,
                    plugins: {
                        tooltip: {
                            callbacks: {
                                label: ctx => `${ctx.label}: ${ctx.parsed.toFixed(2)}%`
                            }
                        },
                        legend: { display: false }
                    }
                }
            });
        } else {
            const chart = chartInstances[canvasId];
            chart.data.labels = labels;
            chart.data.datasets[0].data = data;
            chart.data.datasets[0].backgroundColor = colors;
            chart.update();
        }

        legend.innerHTML = "";
        const ul = document.createElement("ul");
        topData.forEach((item, i) => {
            const label = item.name === "Other" ? "Other" : item.name.split(":")[0].trim();
            ul.innerHTML += `<li><span class="alegend-color" style="background:${colors[i]}"></span>${label}</li>`;
        });
        legend.appendChild(ul);

    } catch (err) {
        console.error(err);
        document.getElementById(legendId).innerHTML = `<p style="color:red">Fout bij ophalen van data: ${err.message}</p>`;
    }
}

function loadAllCharts() {
    loadPieChart("/stats/src-as", "pieChart1", "legend1");
    loadPieChart("/stats/src-ports", "pieChart2", "legend2");
    loadPieChart("/stats/protocol", "pieChart3", "legend3");
    loadPieChart("/stats/src-country", "pieChart4", "legend4");
    loadPieChart("/stats/etype", "pieChart5", "legend5");
}

window.addEventListener("DOMContentLoaded", () => {
    loadAllCharts();
    setInterval(loadAllCharts, 60000);
});

let chart;

async function fetchData() {
  const response = await fetch('/stats/graph');
  const jsonData = await response.json();

  const labels = jsonData.data.map(item => {
    const date = new Date(item.t);
    const day = String(date.getDate()).padStart(2, '0');
    const month = String(date.getMonth() + 1).padStart(2, '0');
    const year = date.getFullYear();
    const hours = String(date.getHours()).padStart(2, '0');
    const minutes = String(date.getMinutes()).padStart(2, '0');
    return `${day}/${month}/${year} ${hours}:${minutes}`;
  });

  const rawData = jsonData.data.map(item => item.gbps);
  const maxVal = Math.max(...rawData);
  const scaleFactor = maxVal < 1 ? 1000 : 1;
  const unitLabel = maxVal < 1 ? 'Mbit/s' : 'Gbit/s';
  const data = rawData.map(v => v * scaleFactor);

  return { labels, data, unitLabel };
}

async function initChart() {
  const ctx = document.getElementById('liveChart').getContext('2d');
  const { labels, data, unitLabel } = await fetchData();

  chart = new Chart(ctx, {
    type: 'line',
    data: {
      labels,
      datasets: [{
        label: `Network traffic (${unitLabel})`,
        data,
        borderColor: 'blue',
        backgroundColor: 'rgba(0,0,255,0.1)',
        fill: true,
        pointRadius: 0,
        pointHoverRadius: 5
      }]
    },
    options: {
      responsive: true,
      scales: {
        y: {
          beginAtZero: true,
          title: {
            display: true,
            text: unitLabel
          }
        },
        x: {
          title: {
            display: true,
            text: 'Time'
          }
        }
      },
      interaction: {
        mode: 'index',
        intersect: false
      },
      plugins: {
        tooltip: { enabled: true },
        legend: { display: true }
      }
    }
  });
}

async function updateChart() {
  const { labels, data, unitLabel } = await fetchData();
  chart.data.labels = labels;
  chart.data.datasets[0].data = data;
  chart.options.scales.y.title.text = unitLabel;
  chart.data.datasets[0].label = `Network traffic (${unitLabel})`;
  chart.update();
}

window.addEventListener("DOMContentLoaded", () => {
  loadAllCharts();
  initChart();
  setInterval(loadAllCharts, 60000);
  setInterval(updateChart, 60000);
});