(function () {
  var trend = window.adminCostTrend || [];
  var i18n = window.adminCostI18n || {};
  if (!trend.length || typeof Chart === "undefined") return;

  function monthLabel(monthStr) {
    var parts = monthStr.split("-");
    if (parts.length < 2) return monthStr;
    var d = new Date(parseInt(parts[0], 10), parseInt(parts[1], 10) - 1, 1);
    return d.toLocaleDateString([], { month: "short", year: "2-digit" });
  }

  var labels = trend.map(function (row) {
    return monthLabel(row.month);
  });

  var chartOptions = {
    responsive: true,
    maintainAspectRatio: false,
    animation: { duration: 300 },
    scales: {
      x: {
        ticks: { maxTicksLimit: 12, color: "#9a9aad", font: { size: 10 } },
        grid: { color: "rgba(255,255,255,0.06)" }
      },
      y: {
        beginAtZero: true,
        ticks: { color: "#9a9aad", font: { size: 10 } },
        grid: { color: "rgba(255,255,255,0.06)" }
      }
    },
    plugins: { legend: { labels: { color: "#ccc", boxWidth: 12 } } }
  };

  var euroTicks = {
    ticks: {
      color: "#9a9aad",
      font: { size: 10 },
      callback: function (v) {
        return "€" + v;
      }
    }
  };

  var costRevenueCanvas = document.getElementById("chart-cost-revenue");
  if (costRevenueCanvas) {
    new Chart(costRevenueCanvas, {
      type: "bar",
      data: {
        labels: labels,
        datasets: [
          {
            label: i18n.cost || "Cost",
            data: trend.map(function (r) { return (r.cost_cents || 0) / 100; }),
            backgroundColor: "rgba(229, 57, 53, 0.65)"
          },
          {
            label: i18n.revenue || "Revenue",
            data: trend.map(function (r) { return (r.revenue_cents || 0) / 100; }),
            backgroundColor: "rgba(67, 160, 71, 0.65)"
          },
          {
            label: i18n.margin || "Margin",
            data: trend.map(function (r) { return (r.margin_cents || 0) / 100; }),
            backgroundColor: "rgba(255, 193, 7, 0.55)"
          }
        ]
      },
      options: {
        ...chartOptions,
        scales: {
          x: chartOptions.scales.x,
          y: { ...chartOptions.scales.y, ...euroTicks }
        }
      }
    });
  }

  var costHourCanvas = document.getElementById("chart-cost-hour");
  if (costHourCanvas) {
    new Chart(costHourCanvas, {
      type: "line",
      data: {
        labels: labels,
        datasets: [{
          label: i18n.costPerHour || "Cost/hour",
          data: trend.map(function (r) {
            return r.cost_per_hour_cents ? r.cost_per_hour_cents / 100 : 0;
          }),
          borderColor: "#e53935",
          backgroundColor: "rgba(229, 57, 53, 0.12)",
          fill: true,
          tension: 0.35,
          pointRadius: 2,
          borderWidth: 2
        }]
      },
      options: {
        ...chartOptions,
        scales: {
          x: chartOptions.scales.x,
          y: { ...chartOptions.scales.y, ...euroTicks }
        },
        plugins: { legend: { display: false } }
      }
    });
  }

  var hoursCanvas = document.getElementById("chart-hours");
  if (hoursCanvas) {
    new Chart(hoursCanvas, {
      type: "line",
      data: {
        labels: labels,
        datasets: [{
          label: i18n.hours || "Hours",
          data: trend.map(function (r) { return r.hours || 0; }),
          borderColor: "#43a047",
          backgroundColor: "rgba(67, 160, 71, 0.12)",
          fill: true,
          tension: 0.35,
          pointRadius: 2,
          borderWidth: 2
        }]
      },
      options: {
        ...chartOptions,
        plugins: { legend: { display: false } }
      }
    });
  }
})();