// public/js/galleryUtils.js
// Ordinamento, filtri, raggruppamento e formattazione.

(() => {
  "use strict";

  function sortByDate(items, direction = "desc") {
    return items.slice().sort((a, b) => {
      const da = a?.taken_at ? new Date(a.taken_at) : 0;
      const db = b?.taken_at ? new Date(b.taken_at) : 0;
      return direction === "asc" ? da - db : db - da;
    });
  }

  function applyFilters(items) {
    if (window.state?.mode === "activities") return items;

    const filter = window.currentFilter || "";
    const query = String(window.currentSearch || "")
      .trim()
      .toLocaleLowerCase("it-IT");
    const selectedYear = window.currentYear
      ? Number(window.currentYear)
      : null;
    const selectedMonth = window.currentMonth
      ? Number(window.currentMonth)
      : null;
    const selectedFolder = String(window.currentFolder || "");

    function getFolder(item) {
      return String(item?.cartella || item?.folder || "").trim();
    }

    function hasGps(item) {
      const gps = item?.gps;
      if (!gps) return false;

      const lat = Number(gps.lat);
      const lng = Number(gps.lng);

      return Number.isFinite(lat) &&
        Number.isFinite(lng) &&
        lat >= -90 && lat <= 90 &&
        lng >= -180 && lng <= 180;
    }

    function searchableText(item) {
      return [
        item?.name,
        item?.file_name,
        item?.filename,
        item?.originalname,
        item?.path,
        item?.relative_path,
        item?.full_path,
        item?.cartella,
        item?.folder
      ]
        .filter(value => value !== undefined && value !== null)
        .join(" ")
        .toLocaleLowerCase("it-IT");
    }

    return items.filter(item => {
      const mime = String(item?.mime_type || "").toLowerCase();

      if (selectedFolder && getFolder(item) !== selectedFolder) {
        return false;
      }

      switch (filter) {
        case "folder":
          if (!(item?.cartella || item?.folder)) return false;
          break;

        case "location":
          if (!hasGps(item)) return false;
          break;

        case "type":       // Compatibilità con il vecchio pulsante.
        case "images":
          if (!mime.startsWith("image/")) return false;
          break;

        case "videos":
          if (!mime.startsWith("video/")) return false;
          break;
      }

      if (query && !searchableText(item).includes(query)) {
        return false;
      }

      if (selectedYear || selectedMonth) {
        if (!item?.taken_at) return false;

        const date = new Date(item.taken_at);
        if (Number.isNaN(date.getTime())) return false;

        if (selectedYear && date.getFullYear() !== selectedYear) {
          return false;
        }

        if (selectedMonth && date.getMonth() + 1 !== selectedMonth) {
          return false;
        }
      }

      return true;
    });
  }

  function formatDay(date) {
    return date.toLocaleDateString("it-IT", {
      weekday: "long",
      day: "numeric",
      month: "long"
    });
  }

  function formatMonth(date) {
    return date.toLocaleDateString("it-IT", {
      month: "long",
      year: "numeric"
    });
  }

  function groupByDate(items, mode = "auto") {
    const sections = [];
    const sectionMap = new Map();
    const now = new Date();

    function getLabel(item) {
      if (mode === "folder") {
        return String(item?.cartella || item?.folder || "").trim()
          || "Senza cartella";
      }

      const date = item?.taken_at ? new Date(item.taken_at) : null;
      if (!date || Number.isNaN(date.getTime())) return "Senza data";

      const diffDays = Math.floor((now - date) / 86400000);

      if (mode === "day") return formatDay(date);
      if (mode === "month") return formatMonth(date);
      if (mode === "year") return String(date.getFullYear());

      if (diffDays === 0) return "Oggi";
      if (diffDays === 1) return "Ieri";
      if (diffDays <= 7) return "Questa settimana";
      if (diffDays <= 14) return "La settimana scorsa";
      if (diffDays <= 30) return "Questo mese";
      if (diffDays <= 60) return "Mese scorso";
      if (date.getFullYear() === now.getFullYear()) return formatMonth(date);
      return String(date.getFullYear());
    }

    for (const item of items) {
      const label = getLabel(item);
      let section = sectionMap.get(label);

      if (!section) {
        section = { label, items: [] };
        sectionMap.set(label, section);
        sections.push(section);
      }

      section.items.push(item);
    }

    return sections;
  }

  function escapeHtml(value) {
    return String(value ?? "")
      .replaceAll("&", "&amp;")
      .replaceAll("<", "&lt;")
      .replaceAll(">", "&gt;")
      .replaceAll('"', "&quot;")
      .replaceAll("'", "&#039;");
  }

  function formatDurationShort(ms) {
    const totalSec = Math.round(ms / 1000);
    const hours = Math.floor(totalSec / 3600);
    const minutes = Math.floor((totalSec % 3600) / 60);
    return hours > 0 ? `${hours}h ${minutes}m` : `${minutes}m`;
  }

  function formatActivityMeta(item) {
    const parts = [];

    if (item.sport) parts.push(item.sport);
    if (Number.isFinite(Number(item.distance_meters))) {
      parts.push(`${(Number(item.distance_meters) / 1000).toFixed(1)} km`);
    }
    if (Number.isFinite(Number(item.duration_millis))) {
      parts.push(formatDurationShort(Number(item.duration_millis)));
    }

    return parts.join(" · ");
  }

  window.GalleryUtils = Object.freeze({
    sortByDate,
    applyFilters,
    groupByDate,
    formatDay,
    formatMonth,
    escapeHtml,
    formatDurationShort,
    formatActivityMeta
  });

  // Compatibilità con gli script esistenti.
  window.sortByDate = sortByDate;
  window.applyFilters = applyFilters;
  window.groupByDate = groupByDate;
})();