/**
 * charts.js — Graphiques Chart.js pour l'analyse technique.
 * - Graphique principal : cours de clôture + MM20/MM50/MM200 (toggle)
 * - Graphique volume : histogramme + moyenne 20j
 * - Graphique volatilité : courbe 20j
 *
 * Utilise un axe X catégoriel (dates en labels) pour éviter toute
 * dépendance à un adapter temporel.
 */

document.addEventListener("DOMContentLoaded", () => {
  const dataCoursEl = document.getElementById("data-cours");
  const dataVolEl = document.getElementById("data-volumes");
  const dataVolatEl = document.getElementById("data-volatilite");

  if (!dataCoursEl) return; // pas de données (page d'accueil)

  let dataCours, dataVol, dataVolat;
  try {
    dataCours = JSON.parse(dataCoursEl.textContent);
    dataVol = JSON.parse(dataVolEl.textContent);
    dataVolat = JSON.parse(dataVolatEl.textContent);
  } catch (e) {
    console.error("Erreur parsing JSON graphiques:", e);
    return;
  }

  console.log("[charts] données chargées:",
    "cours=" + dataCours.dates.length + "pts",
    "vol=" + dataVol.volumes.length + "pts");

  // --- Configuration globale Chart.js ---
  if (typeof Chart === "undefined") {
    console.error("[charts] Chart.js non chargé");
    return;
  }
  Chart.defaults.color = "#9ca3af";
  Chart.defaults.borderColor = "#1f2937";
  Chart.defaults.font.family = "system-ui, sans-serif";

  const labels = dataCours.dates;

  // ===================== GRAPHIQUE PRINCIPAL =====================
  const datasetsCours = [
    {
      label: "Cours",
      data: dataCours.close,
      borderColor: "#60a5fa",
      backgroundColor: "rgba(96, 165, 250, 0.1)",
      borderWidth: 1.5,
      pointRadius: 0,
      fill: true,
      tension: 0.1,
    },
  ];

  if (dataCours.MM20) {
    datasetsCours.push({
      label: "MM20", data: dataCours.MM20, borderColor: "#3b82f6",
      borderWidth: 1.2, pointRadius: 0, fill: false, tension: 0.1, hidden: false, id: "mm20",
    });
  }
  if (dataCours.MM50) {
    datasetsCours.push({
      label: "MM50", data: dataCours.MM50, borderColor: "#10b981",
      borderWidth: 1.2, pointRadius: 0, fill: false, tension: 0.1, hidden: false, id: "mm50",
    });
  }
  if (dataCours.MM200) {
    datasetsCours.push({
      label: "MM200", data: dataCours.MM200, borderColor: "#f59e0b",
      borderWidth: 1.2, pointRadius: 0, fill: false, tension: 0.1, hidden: false, id: "mm200",
    });
  }

  const ctxCours = document.getElementById("chartCours");
  if (ctxCours) {
    const chartCours = new Chart(ctxCours, {
      type: "line",
      data: { labels: labels, datasets: datasetsCours },
      options: {
        responsive: true,
        maintainAspectRatio: false,
        interaction: { intersect: false, mode: "index" },
        scales: {
          x: {
            grid: { color: "#1f2937" },
            ticks: { maxTicksLimit: 10, autoSkip: true },
          },
          y: {
            position: "right",
            grid: { color: "#1f2937" },
            ticks: { callback: v => v.toFixed(2) },
          },
        },
        plugins: {
          legend: { display: false },
          tooltip: {
            backgroundColor: "#111827", borderColor: "#374151", borderWidth: 1,
            callbacks: { label: ctx => `${ctx.dataset.label}: ${ctx.parsed.y !== null ? ctx.parsed.y.toFixed(2) : 'N/A'}` },
          },
        },
      },
    });

    document.getElementById("toggle-mm20")?.addEventListener("change", e => {
      const ds = chartCours.data.datasets.find(d => d.id === "mm20");
      if (ds) ds.hidden = !e.target.checked;
      chartCours.update();
    });
    document.getElementById("toggle-mm50")?.addEventListener("change", e => {
      const ds = chartCours.data.datasets.find(d => d.id === "mm50");
      if (ds) ds.hidden = !e.target.checked;
      chartCours.update();
    });
    document.getElementById("toggle-mm200")?.addEventListener("change", e => {
      const ds = chartCours.data.datasets.find(d => d.id === "mm200");
      if (ds) ds.hidden = !e.target.checked;
      chartCours.update();
    });
  }

  // ===================== GRAPHIQUE VOLUME =====================
  const ctxVol = document.getElementById("chartVolume");
  if (ctxVol) {
    const volColors = dataVol.volumes.map((v, i) => {
      const vm = dataVol.moyenne_20j[i];
      return vm && v > vm * 2 ? "#f59e0b" : "#3b82f6";
    });

    new Chart(ctxVol, {
      type: "bar",
      data: {
        labels: dataVol.dates,
        datasets: [
          { label: "Volume", data: dataVol.volumes, backgroundColor: volColors, borderWidth: 0, order: 2 },
          {
            label: "Moyenne 20j", type: "line", data: dataVol.moyenne_20j,
            borderColor: "#10b981", borderWidth: 1.5, pointRadius: 0, fill: false, tension: 0.1, order: 1,
          },
        ],
      },
      options: {
        responsive: true,
        maintainAspectRatio: false,
        interaction: { intersect: false, mode: "index" },
        scales: {
          x: { display: false },
          y: {
            position: "right", grid: { color: "#1f2937" },
            ticks: { callback: v => v >= 1e6 ? (v / 1e6).toFixed(1) + "M" : v >= 1e3 ? (v / 1e3).toFixed(0) + "K" : v },
          },
        },
        plugins: {
          legend: { display: false },
          tooltip: {
            backgroundColor: "#111827", borderColor: "#374151", borderWidth: 1,
            callbacks: { label: ctx => ctx.dataset.label + ": " + (ctx.parsed.y !== null ? ctx.parsed.y.toLocaleString("fr-FR") : "N/A") },
          },
        },
      },
    });
  }

  // ===================== GRAPHIQUE VOLATILITÉ =====================
  const ctxVolat = document.getElementById("chartVolatilite");
  if (ctxVolat) {
    new Chart(ctxVolat, {
      type: "line",
      data: {
        labels: dataVolat.dates,
        datasets: [
          {
            label: "Volatilité 20j", data: dataVolat.volatilite_20j,
            borderColor: "#f59e0b", backgroundColor: "rgba(245, 158, 11, 0.1)",
            borderWidth: 1.5, pointRadius: 0, fill: true, tension: 0.2,
          },
        ],
      },
      options: {
        responsive: true,
        maintainAspectRatio: false,
        interaction: { intersect: false, mode: "index" },
        scales: {
          x: { grid: { color: "#1f2937" }, ticks: { maxTicksLimit: 10, autoSkip: true } },
          y: { position: "right", grid: { color: "#1f2937" }, ticks: { callback: v => v.toFixed(1) + "%" } },
        },
        plugins: {
          legend: { display: false },
          tooltip: {
            backgroundColor: "#111827", borderColor: "#374151", borderWidth: 1,
            callbacks: { label: ctx => "Volatilité: " + (ctx.parsed.y !== null ? ctx.parsed.y.toFixed(2) : "N/A") + "%" },
          },
        },
      },
    });
  }

  console.log("[charts] graphiques initialisés");
});