// Screenshot — capture the active tab. The panel drives everything through
// two messages ("capture" and "save"); main-side capture-tab does the actual
// pixel work. This module is a thin router.
const fs = require("node:fs");
const path = require("node:path");

module.exports = {
  activate(api) {
    api.registerSidebarPanel({
      id: "main",
      title: "Screenshot",
      icon: "📸",
      page: "panel.html",
    });

    // Region-select overlay source, loaded once at activation. The panel
    // triggers region mode; main injects this into the tab and awaits the
    // rect it resolves with. Keeping the DOM code in a sibling file (not a
    // JS string in main) lets someone edit the overlay UX without touching
    // the browser core.
    let overlaySource = "";
    try { overlaySource = fs.readFileSync(path.join(api.folder, "panel-preload.js"), "utf8"); }
    catch (e) { api.log("panel-preload.js not readable:", e?.message); }

    api.onMessage("capture", async (payload) => {
      const mode = String(payload?.mode || "visible");
      const format = payload?.format === "jpeg" ? "jpeg" : "png";
      const quality = Number(payload?.quality) || 90;
      const opts = { mode, format, quality };
      if (mode === "region") opts.overlaySource = overlaySource;
      return api.captureTab(opts);
    });

    api.onMessage("save", async (payload) => {
      const dataUrl = String(payload?.dataUrl || "");
      const host = String(payload?.host || "tab");
      const format = payload?.format === "jpeg" ? "jpeg" : "png";
      const ext = format === "jpeg" ? "jpg" : "png";
      // ISO date, but with the colons Windows won't accept in filenames swapped
      // out. Second precision is enough; the filename is human-oriented.
      const iso = new Date().toISOString().replace(/[:.]/g, "-").replace(/-\d{3}Z$/, "Z");
      const safeHost = (host || "tab").replace(/[^a-z0-9._-]+/gi, "_") || "tab";
      const filename = `theseus-screenshot-${safeHost}-${iso}.${ext}`;
      return api.saveCapture({ dataUrl, filename });
    });

    api.log("registered screenshot panel");
  },
};