// public/dashboard/js/charts.js
// Chart.js helpers: create & update charts without recreating canvases.

let dailyLineChart = null;
let categoryChart = null;

// Export chart instances untuk akses dari dashboard.js
export function getDailyChart() {
  return dailyLineChart;
}

export function getCategoryChart() {
  return categoryChart;
}

export function initDailyChart(ctx) {
  if (dailyLineChart) return dailyLineChart;

  dailyLineChart = new Chart(ctx, {
    type: 'line',
    data: {
      labels: [],
      datasets: [
        {
          label: 'Jumlah',
          data: [],
          borderColor: '#111827',
          backgroundColor: 'rgba(17, 24, 39, 0.06)',
          borderWidth: 2,
          tension: 0.35,
          fill: true,
          pointRadius: 2.5,
          pointBackgroundColor: '#111827'
        },
        {
          label: 'Pendapatan',
          data: [],
          borderColor: '#6b7280',
          backgroundColor: 'rgba(156, 163, 175, 0.08)',
          borderWidth: 2,
          tension: 0.35,
          fill: true,
          pointRadius: 2.5,
          pointBackgroundColor: '#6b7280',
          yAxisID: 'y1'
        }
      ]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      interaction: {
        mode: 'index',
        intersect: false
      },
      scales: {
        y: {
          beginAtZero: true,
          grid: { color: '#e5e7eb' },
          ticks: { font: { size: 11 } }
        },
        y1: {
          beginAtZero: true,
          position: 'right',
          grid: { drawOnChartArea: false },
          ticks: {
            font: { size: 11 },
            callback: value => 'Rp ' + new Intl.NumberFormat('id-ID').format(value)
          }
        },
        x: {
          grid: { display: false },
          ticks: { font: { size: 11 } }
        }
      },
      plugins: {
        legend: {
          position: 'bottom',
          labels: {
            boxWidth: 14,
            boxHeight: 4
          }
        }
      }
    }
  });

  return dailyLineChart;
}

export function updateDailyChart({ labels, counts, amounts }) {
  if (!dailyLineChart) {
    console.warn('[Charts] Daily chart belum di-init, skip update');
    // Try to init if canvas exists
    const canvas = document.getElementById('daily-chart');
    if (canvas) {
      console.log('[Charts] Attempting to init daily chart from update function...');
      initDailyChart(canvas.getContext('2d'));
    } else {
      console.error('[Charts] Daily chart canvas not found!');
      return;
    }
  }
  
  if (!dailyLineChart) {
    console.error('[Charts] Failed to init daily chart');
    return;
  }
  
  dailyLineChart.data.labels = labels || [];
  dailyLineChart.data.datasets[0].data = counts || [];
  dailyLineChart.data.datasets[1].data = amounts || [];
  dailyLineChart.update();
  console.log('[Charts] Daily chart updated:', { labelsCount: labels?.length, countsCount: counts?.length, amountsCount: amounts?.length });
}

export function initCategoryChart(ctx) {
  if (categoryChart) return categoryChart;

  categoryChart = new Chart(ctx, {
    type: 'doughnut',
    data: {
      labels: [],
      datasets: [
        {
          label: 'Per Kategori',
          data: [],
          backgroundColor: ['#111827', '#4b5563', '#9ca3af'],
          borderWidth: 0
        }
      ]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      cutout: '60%',
      plugins: {
        legend: {
          position: 'bottom',
          labels: {
            boxWidth: 14,
            boxHeight: 6
          }
        }
      }
    }
  });

  return categoryChart;
}

export function updateCategoryChart({ labels, values }) {
  if (!categoryChart) {
    console.warn('[Charts] Category chart belum di-init, skip update');
    // Try to init if canvas exists
    const canvas = document.getElementById('category-chart');
    if (canvas) {
      console.log('[Charts] Attempting to init category chart from update function...');
      initCategoryChart(canvas.getContext('2d'));
    } else {
      console.error('[Charts] Category chart canvas not found!');
      return;
    }
  }
  
  if (!categoryChart) {
    console.error('[Charts] Failed to init category chart');
    return;
  }
  
  // Pastikan labels dan values tidak kosong
  const finalLabels = labels && labels.length > 0 ? labels : ['Orang', 'Motor', 'Mobil'];
  const finalValues = values && values.length > 0 ? values : [0, 0, 0];
  
  // Pastikan length sama
  const minLength = Math.min(finalLabels.length, finalValues.length);
  const safeLabels = finalLabels.slice(0, minLength);
  const safeValues = finalValues.slice(0, minLength);
  
  categoryChart.data.labels = safeLabels;
  categoryChart.data.datasets[0].data = safeValues;
  
  // Update chart dengan mode 'none' untuk animasi halus
  categoryChart.update('none');
  
  console.log('[Charts] Category chart updated:', { 
    labels: safeLabels, 
    values: safeValues,
    total: safeValues.reduce((a, b) => a + b, 0)
  });
}