Source: stats.js

/**
 * @module stats
 * @description
 * Calculates and displays statistics about the films and series.
 * Shows counts, averages, popular genres, and top-rated content.
 */

/**
 * Calculates and displays statistics for films and series datasets.
 *
 * Shows counts, average ratings, popular genres, unique contributors,
 * and top-rated content in a visual format.
 *
 * @function
 * @returns {void}
 */
function displayStats() {
    const films = Object.values(filmsData);
    const series = Object.values(seriesData);

    const filmsCount = films.length;
    const seriesCount = series.length;

    const filmRatings = films
        .map((f) => f.IMDb)
        .filter((r) => typeof r === "number");
    const avgFilmRating = filmRatings.length ? (filmRatings.reduce((a, b) => a + b, 0) / filmRatings.length).toFixed(1) : "0.0";
    const seriesRatings = series
        .map((s) => s.IMDb)
        .filter((r) => typeof r === "number");
    const avgSeriesRating = seriesRatings.length ? (seriesRatings.reduce((a, b) => a + b, 0) / seriesRatings.length).toFixed(1) : "0.0";

    const genreCount = {};
    films.forEach((f) => (f.genres || []).forEach((g) => (genreCount[g] = (genreCount[g] || 0) + 1)));
    series.forEach((s) => (s.genres || []).forEach((g) => (genreCount[g] = (genreCount[g] || 0) + 1)));
    const popularGenres = Object.entries(genreCount)
        .sort((a, b) => b[1] - a[1])
        .slice(0, 5);

    const allActors = new Set();
    films.forEach((f) => (f.stars || []).forEach((a) => allActors.add(a)));
    series.forEach((s) => (s.stars || []).forEach((a) => allActors.add(a)));
    const allDirectors = new Set();
    films.forEach((f) => (f.directors || []).forEach((d) => allDirectors.add(d)));
    const allCreators = new Set();
    series.forEach((s) => (s.creators || []).forEach((c) => allCreators.add(c)));

    const topFilm = films.reduce((best, f) => (f.IMDb > (best?.IMDb || 0) ? f : best), null);
    const topSeries = series.reduce((best, s) => (s.IMDb > (best?.IMDb || 0) ? s : best), null);

    const totalEpisodes = series.reduce((sum, s) => sum + Object.values(s.seasons || {}).reduce((acc, eps) => acc + (eps?.length || 0), 0), 0);

    document.getElementById("statsContent").innerHTML = `
      <div class="stats-grid">
        <div class="stat-card">
          <h4>🎬 Films</h4>
          <p><strong>${filmsCount}</strong> films</p>
          <p>Moyenne IMDb : <strong>${avgFilmRating}</strong></p>
        </div>
        <div class="stat-card">
          <h4>📺 Séries</h4>
          <p><strong>${seriesCount}</strong> séries</p>
          <p>Moyenne IMDb : <strong>${avgSeriesRating}</strong></p>
          <p>Total épisodes : <strong>${totalEpisodes}</strong></p>
        </div>
        <div class="stat-card">
          <h4>🔥 Genres populaires</h4>
          <ul>
            ${popularGenres.map(([g, c]) => `<li>${g} (${c})</li>`).join("")}
          </ul>
        </div>
        <div class="stat-card">
          <h4>👥 Acteurs uniques</h4>
          <p><strong>${allActors.size}</strong></p>
        </div>
        <div class="stat-card">
          <h4>🎬 Réalisateurs uniques</h4>
          <p><strong>${allDirectors.size}</strong></p>
        </div>
        <div class="stat-card">
          <h4>📝 Créateurs uniques</h4>
          <p><strong>${allCreators.size}</strong></p>
        </div>
        <div class="stat-card">
          <h4>🏆 Film le mieux noté</h4>
          <p>${topFilm ? `${topFilm.title} (${topFilm.IMDb}/10)` : "N/A"}</p>
        </div>
        <div class="stat-card">
          <h4>🏆 Série la mieux notée</h4>
          <p>${topSeries ? `${topSeries.title} (${topSeries.IMDb}/10)` : "N/A"}</p>
        </div>
      </div>
    `;
}