/* desktop-settings-shared.js — the shared engine behind every direction
 * prototype. One mock state model, one widget factory, and the net panel's
 * verify-everything contract simulated: a control applies, then a mock backing
 * "reads back" the real value and confirms (a green verify flash + a toast).
 *
 * Each prototype builds a different LAYOUT from these same widgets and binds to
 * this same state, so the five directions are genuinely comparable. */

const DS = (() => {
  // ---- mock state (what the real settings.py engine would read/write) ------
  const state = {
    autodim: false,
    caffeine: false,
    touchpad: true,
    mouse: true,
    airplane: false,
    nightlight: false,
    dnd: false,
    brightness: 70,
    kbd: 40,
    powerprofile: "balanced", // performance | balanced | saver
    scene: null,              // Focus | Presentation | Battery | Night | null
    wallpaper: {
      dirs: ["~/pictures/wallpaper", "~/pictures/wallpaper/day-night"],
      current: 2,
      day: 1,
      night: 4,
    },
    laptop: true,             // gates the airplane row
  };

  // control metadata: glyph (nerd-font), label, and the "on/off" wording.
  const TOGGLES = {
    autodim:   { glyph: "\u{f0335}", name: "Auto-dim",     on: "dimming", off: "off" },
    caffeine:  { glyph: "\u{f0176}", name: "Caffeine",     on: "awake",   off: "idle ok" },
    touchpad:  { glyph: "\u{f0168}", name: "Touchpad",     on: "on",      off: "off" },
    mouse:     { glyph: "\u{f037d}", name: "Mouse",        on: "on",      off: "off" },
    airplane:  { glyph: "\u{f001d}", name: "Airplane",     on: "on",      off: "off" },
    nightlight:{ glyph: "\u{f0594}", name: "Night light",  on: "warm",    off: "off" },
    dnd:       { glyph: "\u{f009b}", name: "Do Not Disturb",on:"silenced",off: "notifying" },
  };
  const SLIDERS = {
    brightness: { glyph: "\u{f00df}", name: "Brightness", floor: 5 },
    kbd:        { glyph: "\u{f60f}",  name: "Keyboard",   floor: 0 },
  };
  const PROFILES = [
    { id: "performance", label: "Perf" },
    { id: "balanced",    label: "Balanced" },
    { id: "saver",       label: "Saver" },
  ];
  // scenes flip several toggles + a profile at once (the iOS-Focus pattern).
  const SCENES = {
    Focus:        { glyph: "\u{f0210}", sets: { dnd: true,  autodim: false, nightlight: false, powerprofile: "balanced" } },
    Presentation: { glyph: "\u{f0379}", sets: { caffeine: true, autodim: false, dnd: true, powerprofile: "performance" } },
    Battery:      { glyph: "\u{f0079}", sets: { autodim: true, powerprofile: "saver", nightlight: false } },
    Night:        { glyph: "\u{f0594}", sets: { nightlight: true, dnd: true, autodim: true, powerprofile: "saver" } },
  };

  let toastEl = null;
  const listeners = [];
  const onChange = (fn) => listeners.push(fn);
  const emit = () => listeners.forEach((f) => f(state));

  function toast(msg, ok) {
    if (!toastEl) return;
    toastEl.classList.remove("empty");
    toastEl.innerHTML = ok ? `${msg} <span class="ok">✓ verified</span>` : msg;
    clearTimeout(toast._t);
    toast._t = setTimeout(() => {
      toastEl.classList.add("empty");
      toastEl.textContent = "waiting…";
    }, 2600);
  }

  // The verify-everything contract: apply, then a mock backing reads back the
  // actual value and confirms. cb runs on the confirmed readback.
  function applyVerified(label, mutate, el, cb) {
    mutate();
    emit();
    setTimeout(() => {
      if (el) {
        el.classList.remove("verified");
        void el.offsetWidth;
        el.classList.add("verified");
      }
      toast(label, true);
      if (cb) cb();
    }, 140);
  }

  function setToggle(key, el) {
    const meta = TOGGLES[key];
    applyVerified(
      `${meta.name}: ${state[key] ? meta.off : meta.on}`,
      () => { state[key] = !state[key]; state.scene = null; },
      el
    );
  }
  function setSlider(key, value, el) {
    const meta = SLIDERS[key];
    const v = Math.max(meta.floor, Math.min(100, Math.round(value)));
    applyVerified(`${meta.name}: ${v}%`, () => { state[key] = v; }, el);
  }
  function setProfile(id, el) {
    applyVerified(`Power profile: ${id}`, () => { state.powerprofile = id; state.scene = null; }, el);
  }
  function applyScene(name, el) {
    const sc = SCENES[name];
    applyVerified(`Scene: ${name}`, () => {
      Object.assign(state, sc.sets);
      state.scene = name;
    }, el);
  }
  function momentary(label) { toast(`${label}…`, false); }

  // ---- small render helpers the prototypes call ----------------------------
  const h = (tag, cls, txt) => {
    const e = document.createElement(tag);
    if (cls) e.className = cls;
    if (txt != null) e.textContent = txt;
    return e;
  };

  function toggleKey(key) {
    const meta = TOGGLES[key];
    const on = state[key];
    const el = h("div", "ds-key" + (on ? " on" : ""));
    el.innerHTML =
      `<span class="ds-lamp ${on ? "gold" : "off"}"></span>` +
      `<span class="k-glyph">${meta.glyph}</span>` +
      `<span class="k-name">${meta.name}</span>` +
      `<span class="k-state">${on ? meta.on : meta.off}</span>`;
    el.onclick = () => setToggle(key, el);
    return el;
  }

  function toggleTile(key, detailCb) {
    const meta = TOGGLES[key];
    const on = state[key];
    const el = h("div", "ds-tile" + (on ? " on" : ""));
    el.innerHTML =
      `<div class="t-top"><span class="ds-lamp ${on ? "gold" : "off"}"></span>` +
      `<span class="t-glyph">${meta.glyph}</span>` +
      (detailCb ? `<span class="t-detail" title="details">⋯</span>` : "") +
      `</div>` +
      `<div class="t-name">${meta.name}</div>` +
      `<div class="t-state">${on ? meta.on : meta.off}</div>`;
    el.onclick = (ev) => {
      if (detailCb && ev.target.classList.contains("t-detail")) { detailCb(); return; }
      setToggle(key, el);
    };
    return el;
  }

  function slider(key) {
    const meta = SLIDERS[key];
    const row = h("div", "ds-slider");
    row.innerHTML =
      `<span class="s-glyph">${meta.glyph}</span>` +
      `<span class="s-name">${meta.name}</span>`;
    const inp = h("input");
    inp.type = "range"; inp.min = meta.floor; inp.max = 100; inp.value = state[key];
    const pct = h("span", "s-pct", state[key] + "%");
    inp.oninput = () => { pct.textContent = inp.value + "%"; };
    inp.onchange = () => setSlider(key, +inp.value, row);
    row.appendChild(inp); row.appendChild(pct);
    return row;
  }

  function profileSeg() {
    const seg = h("div", "ds-seg");
    PROFILES.forEach((p) => {
      const b = h("button", state.powerprofile === p.id ? "cur" : "", p.label);
      b.onclick = () => setProfile(p.id, seg);
      seg.appendChild(b);
    });
    return seg;
  }

  function sceneKey(name) {
    const sc = SCENES[name];
    const el = h("div", "ds-scene" + (state.scene === name ? " cur" : ""));
    el.innerHTML = `<span class="sc-glyph">${sc.glyph}</span><span class="sc-name">${name}</span>`;
    el.onclick = () => applyScene(name, el);
    return el;
  }

  function actionBtn(label, glyph, danger, fn) {
    const b = h("button", "ds-act" + (danger ? " danger" : ""));
    b.innerHTML = `<span>${glyph}</span><span>${label}</span>`;
    b.onclick = fn || (() => momentary(label));
    return b;
  }

  // Wallpaper sub-view: directory list, thumbnails, day/night pair, sun-time.
  const SWATCHES = [
    "linear-gradient(135deg,#2a3d5c,#101b2e)",
    "linear-gradient(135deg,#5c3a2a,#2e1810)",
    "linear-gradient(135deg,#3a5c2a,#16240f)",
    "linear-gradient(135deg,#40364f,#1b1626)",
    "linear-gradient(135deg,#1a1e2e,#05070d)",
    "linear-gradient(135deg,#5c5030,#2e2810)",
  ];
  function wallpaperSubview(closeCb) {
    const sv = h("div", "ds-subview");
    const head = h("div", "ds-sub-head");
    head.innerHTML = `<span class="back">‹ Back</span><span class="title">Wallpaper</span>`;
    head.querySelector(".back").onclick = closeCb;
    sv.appendChild(head);

    sv.appendChild(engrave("Current"));
    const thumbs = h("div", "ds-thumbs");
    SWATCHES.forEach((g, i) => {
      const t = h("div", "ds-thumb" + (state.wallpaper.current === i ? " cur" : ""));
      t.style.background = g;
      if (i === state.wallpaper.day) t.appendChild(tag("day"));
      if (i === state.wallpaper.night) t.appendChild(tag("night"));
      t.onclick = () => {
        state.wallpaper.current = i;
        applyVerified(`Wallpaper #${i + 1}`, () => {}, t);
        sv.querySelectorAll(".ds-thumb").forEach((x, j) => x.classList.toggle("cur", j === i));
      };
      thumbs.appendChild(t);
    });
    sv.appendChild(thumbs);

    sv.appendChild(engrave("Day / night pair"));
    const dn = h("div", "ds-daynight");
    ["day", "night"].forEach((k) => {
      const cell = h("div", "dn");
      const sw = h("div", "sw"); sw.style.background = SWATCHES[state.wallpaper[k]];
      cell.appendChild(sw);
      cell.appendChild(h("div", "lbl", k === "day" ? "☀ sunup" : "☾ sundown"));
      dn.appendChild(cell);
    });
    sv.appendChild(dn);
    sv.appendChild(h("div", "ds-note", "Swaps at local sunrise/sundown (sun-time from lat/long)."));

    sv.appendChild(engrave("Directories"));
    const dirs = h("div", "ds-dirs");
    state.wallpaper.dirs.forEach((d) => {
      const r = h("div", "ds-dir");
      r.innerHTML = `<span class="ds-lamp"></span><span class="path">${d}</span>`;
      dirs.appendChild(r);
    });
    sv.appendChild(dirs);
    return sv;
  }
  function tag(t) { const e = h("span", "tag", t); return e; }
  function engrave(txt) { return h("div", "ds-engrave", txt); }

  function bindToast(el) { toastEl = el; el.classList.add("empty"); el.textContent = "waiting…"; }

  return {
    state, TOGGLES, SLIDERS, PROFILES, SCENES,
    onChange, toast, bindToast,
    toggleKey, toggleTile, slider, profileSeg, sceneKey, actionBtn,
    wallpaperSubview, engrave, h,
    setToggle, setSlider, setProfile, applyScene, momentary,
  };
})();