bookhoard/web/src/analytics.ts

async function loadAnalytics(): Promise<void> {
  const token = localStorage.getItem("token");
  if (!token) return;

  try {
    const [statsRes, devicesRes, popularRes] = await Promise.all([
      fetch("/api/analytics/stats", {
        headers: { Authorization: `Bearer ${token}` },
      }),
      fetch("/api/analytics/devices", {
        headers: { Authorization: `Bearer ${token}` },
      }),
      fetch("/api/analytics/popular", {
        headers: { Authorization: `Bearer ${token}` },
      }),
    ]);

    if (statsRes.ok) {
      const stats: ReadingStatsResponse = await statsRes.json();
      renderReadingStats(stats);
    }

    if (devicesRes.ok) {
      const devices: DeviceUsageResponse = await devicesRes.json();
      renderDeviceUsage(devices);
    }

    if (popularRes.ok) {
      const popular: PopularBooksResponse = await popularRes.json();
      renderPopularBooks(popular);
    }
  } catch (error) {
    console.error("Failed to load analytics:", error);
    if ((window as any).showToast?.error) {
      (window as any).showToast.error("Failed to load analytics data");
    }
  }
}

function renderReadingStats(stats: ReadingStatsResponse): void {
  const container = document.getElementById("reading-stats");
  if (!container) return;

  container.innerHTML = `
        <div class="grid grid-cols-2 md:grid-cols-4 gap-4">
            <div class="stat-card p-4 rounded-lg" style="background-color: var(--bg-secondary)">
                <p class="text-2xl font-bold" style="color: var(--text-primary)">${stats.total_books_read}</p>
                <p class="text-sm" style="color: var(--text-secondary)">Books Read</p>
            </div>
            <div class="stat-card p-4 rounded-lg" style="background-color: var(--bg-secondary)">
                <p class="text-2xl font-bold" style="color: var(--text-primary)">${stats.total_pages_read}</p>
                <p class="text-sm" style="color: var(--text-secondary)">Pages Read</p>
            </div>
            <div class="stat-card p-4 rounded-lg" style="background-color: var(--bg-secondary)">
                <p class="text-2xl font-bold" style="color: var(--text-primary)">${stats.total_reading_time_minutes}</p>
                <p class="text-sm" style="color: var(--text-secondary)">Minutes Reading</p>
            </div>
            <div class="stat-card p-4 rounded-lg" style="background-color: var(--bg-secondary)">
                <p class="text-2xl font-bold" style="color: var(--text-primary)">${Math.round(stats.completion_rate * 100)}%</p>
                <p class="text-sm" style="color: var(--text-secondary)">Completion Rate</p>
            </div>
        </div>
    `;
}

function renderDeviceUsage(devices: DeviceUsageResponse): void {
  const container = document.getElementById("device-usage");
  if (!container) return;

  if (!devices.devices || devices.devices.length === 0) {
    container.innerHTML =
      '<p style="color: var(--text-secondary)">No device usage data available</p>';
    return;
  }

  container.innerHTML = devices.devices
    .map(
      (device) => `
        <div class="p-3 rounded-lg border" style="background-color: var(--bg-secondary); border-color: var(--border)">
            <div class="flex justify-between items-center">
                <div>
                    <p class="font-medium" style="color: var(--text-primary)">${device.device_name}</p>
                    <p class="text-sm" style="color: var(--text-secondary)">${device.device_type}</p>
                </div>
                <div class="text-right">
                    <p class="font-medium" style="color: var(--text-primary)">${Math.round(device.total_time_minutes)} min</p>
                    <p class="text-sm" style="color: var(--text-secondary)">${device.sync_count} syncs</p>
                </div>
            </div>
        </div>
    `,
    )
    .join("");
}

function renderPopularBooks(popular: PopularBooksResponse): void {
  const container = document.getElementById("popular-books");
  if (!container) return;

  if (!popular.books || popular.books.length === 0) {
    container.innerHTML =
      '<p style="color: var(--text-secondary)">No reading history available</p>';
    return;
  }

  container.innerHTML = popular.books
    .map(
      (book) => `
        <div class="p-3 rounded-lg border flex items-center space-x-3" style="background-color: var(--bg-secondary); border-color: var(--border)">
            <div class="flex-1">
                <p class="font-medium" style="color: var(--text-primary)">${book.title}</p>
                <p class="text-sm" style="color: var(--text-secondary)">${book.author}</p>
            </div>
            <div class="text-right">
                <p class="font-medium" style="color: var(--text-primary)">${book.read_count}x</p>
                <p class="text-sm" style="color: var(--text-secondary)">${Math.round(book.avg_completion * 100)}%</p>
            </div>
        </div>
    `,
    )
    .join("");
}

document.addEventListener("DOMContentLoaded", loadAnalytics);

(window as any).loadAnalytics = loadAnalytics;