import { FIELD_IDS, blankPlan } from "/shared/fields.js";
import { computeLedger } from "/shared/ledger.js";
import { formatDuration, formatSigned, parseRangeMidpoint } from "/shared/time.js";
import { CULTIVARS, findCultivar } from "/shared/reference-data.js";
import { buildPlanCurve, pointsToPathD, tToX, tempToY } from "/shared/curve.js";
import { initPrefillPanel } from "./prefill-ui.js";
import { initAlogPanel } from "./alog-ui.js";
import { initPrint } from "./print.js";

const FIELD_ID_SET = new Set(FIELD_IDS);
const STORAGE_KEY = "roastPlannerPlan.v1";
const BAND_DOMAIN = [60, 220]; // shared °C domain for every band-track in the Machine Plan section

export const state = { plan: loadFromStorage() ?? blankPlan() };

const form = document.getElementById("plan-form");

// The print worksheet (#print-sheet) sits outside #plan-form on purpose — see index.html —
// so its radios don't fight the screen form's identically-named radios for exclusivity.
// Every sync pass therefore has to reach both containers explicitly.
function allNamedInputs() {
  return document.querySelectorAll(
    "#plan-form input, #plan-form select, #plan-form textarea, " +
      "#print-sheet input, #print-sheet select, #print-sheet textarea",
  );
}

// ---- nested path get/set for names like "temps.charge.tempC" or "blendComponents.0.cultivar"
function getPath(obj, path) {
  return path.split(".").reduce((o, k) => (o == null ? undefined : o[k]), obj);
}
function setPath(obj, path, value) {
  const parts = path.split(".");
  let node = obj;
  for (let i = 0; i < parts.length - 1; i++) {
    if (node[parts[i]] === undefined || node[parts[i]] === null) node[parts[i]] = {};
    node = node[parts[i]];
  }
  node[parts[parts.length - 1]] = value;
}

function valueForName(name) {
  if (FIELD_ID_SET.has(name)) return state.plan.fields[name] ?? "";
  const v = getPath(state.plan, name);
  return v ?? "";
}

function setValueForName(name, value) {
  if (FIELD_ID_SET.has(name)) {
    state.plan.fields[name] = value;
  } else {
    setPath(state.plan, name, value);
  }
}

// ---- dynamic rows: blend components + actuator schedule
// Each renders into TWO places that share `name` attributes: the interactive screen
// component, and the hidden print-only worksheet table (#blend-rows / #actuator-rows),
// which is kept in sync by renderFormFromPlan() and only needs to look right on paper.
function renderBlendPrintRows() {
  const tbody = document.getElementById("blend-rows");
  tbody.innerHTML = "";
  state.plan.blendComponents.forEach((_, i) => {
    const tr = document.createElement("tr");
    tr.innerHTML = `
      <td><input class="f w ws-input" name="blendComponents.${i}.cultivar"><span class="pv"></span></td>
      <td><input class="f ws-input" style="min-width:18mm" name="blendComponents.${i}.group"><span class="pv"></span></td>
      <td><input class="f ws-input" style="min-width:20mm" name="blendComponents.${i}.process"><span class="pv"></span></td>
      <td class="num"><input class="f n ws-input" name="blendComponents.${i}.sharePct"><span class="pv"></span></td>
      <td class="num"><input class="f n ws-input" name="blendComponents.${i}.fcAnchor"><span class="pv"></span></td>
    `;
    tbody.appendChild(tr);
  });
}

function renderBlendCards() {
  const wrap = document.getElementById("blend-cards");
  wrap.innerHTML = "";
  state.plan.blendComponents.forEach((_, i) => {
    const card = document.createElement("div");
    card.className = "blend-card";
    card.innerHTML = `
      <label class="field"><span class="field-label">Cultivar</span><input class="field-input" name="blendComponents.${i}.cultivar" placeholder="e.g. Caturra"></label>
      <label class="field"><span class="field-label">Group</span><input class="field-input" name="blendComponents.${i}.group"></label>
      <label class="field"><span class="field-label">Process</span><input class="field-input" name="blendComponents.${i}.process"></label>
      <label class="field"><span class="field-label">Share %</span><input class="field-input sm" name="blendComponents.${i}.sharePct"></label>
      <label class="field"><span class="field-label">FC anchor</span><input class="field-input sm" name="blendComponents.${i}.fcAnchor"></label>
      <button type="button" class="blend-remove" data-remove-blend="${i}" aria-label="Remove component" ${state.plan.blendComponents.length <= 1 ? "disabled" : ""}>✕</button>
    `;
    wrap.appendChild(card);
  });
  for (const btn of wrap.querySelectorAll("[data-remove-blend]")) {
    btn.addEventListener("click", () => {
      const i = Number(btn.dataset.removeBlend);
      if (state.plan.blendComponents.length <= 1) return;
      state.plan.blendComponents.splice(i, 1);
      renderBlend();
      renderFormFromPlan();
      recompute();
    });
  }
}

function updateBlendTotal() {
  const total = state.plan.blendComponents.reduce((sum, c) => sum + (Number.parseFloat(c.sharePct) || 0), 0);
  const fill = document.getElementById("blend-total-fill");
  const label = document.getElementById("blend-total-label");
  if (!fill || !label) return;
  fill.style.width = `${Math.min(100, total)}%`;
  fill.classList.toggle("over", total > 100);
  fill.classList.toggle("under", total > 0 && total < 100);
  label.textContent = `${Math.round(total * 10) / 10}% of 100%`;
}

function updateBlendVisibility(mode) {
  document.getElementById("blend-body").classList.toggle("collapsed", mode !== "blend");
}

function renderBlend() {
  renderBlendPrintRows();
  renderBlendCards();
  updateBlendTotal();
}

function renderActuatorPrintRows() {
  const tbody = document.getElementById("actuator-rows");
  tbody.innerHTML = "";
  state.plan.actuators.forEach((_, i) => {
    const tr = document.createElement("tr");
    tr.innerHTML = `
      <td class="num"><input class="f n ws-input" name="actuators.${i}.time"><span class="pv"></span></td>
      <td class="num"><input class="f n ws-input" name="actuators.${i}.heatPct"><span class="pv"></span></td>
      <td class="num"><input class="f n ws-input" name="actuators.${i}.fanPct"><span class="pv"></span></td>
      <td class="num"><input class="f n ws-input" name="actuators.${i}.expectedBt"><span class="pv"></span></td>
      <td><input class="f ws-input" style="min-width:78mm" name="actuators.${i}.why"><span class="pv"></span></td>
    `;
    tbody.appendChild(tr);
  });
}

function renderActuatorTimeline() {
  const wrap = document.getElementById("actuator-timeline");
  wrap.innerHTML = "";
  state.plan.actuators.forEach((_, i) => {
    const step = document.createElement("div");
    step.className = "actuator-step";
    step.innerHTML = `
      <div class="actuator-rail"><div class="actuator-dot"></div><div class="actuator-line"></div></div>
      <div class="actuator-card">
        <label class="field"><span class="field-label">Time</span><input class="field-input sm" name="actuators.${i}.time" placeholder="m:ss"></label>
        <label class="field"><span class="field-label">Heat %</span><input class="field-input sm" name="actuators.${i}.heatPct"></label>
        <label class="field"><span class="field-label">Fan %</span><input class="field-input sm" name="actuators.${i}.fanPct"></label>
        <button type="button" class="actuator-remove" data-remove-actuator="${i}" aria-label="Remove step" ${state.plan.actuators.length <= 1 ? "disabled" : ""}>✕</button>
        <label class="field"><span class="field-label">Expected BT</span><input class="field-input sm" name="actuators.${i}.expectedBt"></label>
        <label class="field actuator-why"><span class="field-label">Why this change</span><input class="field-input" name="actuators.${i}.why" placeholder="What you're watching for"></label>
      </div>
    `;
    wrap.appendChild(step);
  });
  for (const btn of wrap.querySelectorAll("[data-remove-actuator]")) {
    btn.addEventListener("click", () => {
      const i = Number(btn.dataset.removeActuator);
      if (state.plan.actuators.length <= 1) return;
      state.plan.actuators.splice(i, 1);
      renderActuators();
      renderFormFromPlan();
      recompute();
    });
  }
}

function renderActuators() {
  renderActuatorPrintRows();
  renderActuatorTimeline();
}

// ---- populate every control in the form from state.plan
export function renderFormFromPlan() {
  for (const el of allNamedInputs()) {
    const name = el.name;
    if (!name) continue;
    const value = valueForName(name);
    if (el.type === "radio") {
      el.checked = el.value === value;
    } else if (el.type === "checkbox") {
      el.checked = Boolean(value);
    } else {
      el.value = value ?? "";
    }
  }
  updateBlendVisibility(state.plan.fields["2.1"]);
  document.getElementById("header-coffee-name").textContent = state.plan.fields["0.1"] || "New plan";
}

function fmtOut(id, text) {
  for (const el of document.querySelectorAll(`[data-out="${id}"]`)) el.textContent = text ?? "—";
}

function renderLedger() {
  const ledger = computeLedger(state.plan);
  const d = (s) => (s === null || s === undefined ? "—" : formatDuration(s));
  const ds = (s) => (s === null || s === undefined ? "—" : formatSigned(s));

  fmtOut("l1", d(ledger.lines.l1));
  fmtOut("l2", ds(ledger.lines.l2));
  fmtOut("l3", ds(ledger.lines.l3));
  fmtOut("A", d(ledger.A));
  fmtOut("yellow", d(ledger.yellow));
  fmtOut("maillard", d(ledger.maillard));
  fmtOut("l7", d(ledger.lines.l7));
  fmtOut("l8", ds(ledger.lines.l8));
  fmtOut("l9", ds(ledger.lines.l9));
  fmtOut("C", d(ledger.C));
  fmtOut("D", d(ledger.D));

  const pct = (v) => (v === null || v === undefined ? "—" : `${v.toFixed(1)}%`);
  fmtOut("check-drying", pct(ledger.checks.drying.pct));
  fmtOut("check-maillard", pct(ledger.checks.maillard.pct));
  fmtOut("check-dtr", pct(ledger.checks.dtr.pct));
  fmtOut("check-ceiling", d(ledger.checks.ceiling.valueS));

  for (const [key, check] of Object.entries(ledger.checks)) {
    for (const cell of document.querySelectorAll(`[data-pass="${key}"]`)) {
      cell.classList.remove("pass", "fail", "unknown");
      cell.classList.add(check.pass === null ? "unknown" : check.pass ? "pass" : "fail");
    }
  }

  // Box 8 / box 11 derived time columns
  fmtOut("t-charge", "0:00");
  fmtOut("t-yellow", d(ledger.yellow));
  fmtOut("t-fc", d(ledger.A));
  fmtOut("t-drop", d(ledger.D));
  fmtOut("pa-charge", "0:00");
  fmtOut("pa-tp", state.plan.temps.tp.time || "—");
  fmtOut("pa-yellow", d(ledger.yellow));
  fmtOut("pa-fc", d(ledger.A));
  fmtOut("pa-drop", d(ledger.D));

  document.getElementById("back-coffee-name").textContent = state.plan.fields["0.1"] || "";
  document.getElementById("header-coffee-name").textContent = state.plan.fields["0.1"] || "New plan";

  return ledger;
}

function domainPct(v) {
  const [lo, hi] = BAND_DOMAIN;
  return Math.max(0, Math.min(100, ((v - lo) / (hi - lo)) * 100));
}

function renderBandRanges() {
  for (const row of document.querySelectorAll(".band-row")) {
    const lo = Number(row.dataset.bandLo);
    const hi = Number(row.dataset.bandHi);
    const range = row.querySelector(".band-range");
    if (!range) continue;
    const loPct = domainPct(lo);
    range.style.left = `${loPct}%`;
    range.style.width = `${domainPct(hi) - loPct}%`;
  }
}

function renderBandMarkers() {
  for (const row of document.querySelectorAll(".band-row")) {
    const input = row.querySelector('input[name$=".tempC"]');
    const marker = row.querySelector(".band-marker");
    if (!input || !marker) continue;
    const v = Number.parseFloat(input.value);
    if (!Number.isFinite(v)) {
      marker.style.display = "none";
      continue;
    }
    const lo = Number(row.dataset.bandLo);
    const hi = Number(row.dataset.bandHi);
    marker.style.display = "block";
    marker.style.left = `${domainPct(v)}%`;
    marker.classList.toggle("out-of-band", v < lo || v > hi);
  }
}

function paintCurveInto(planGroup, refGroup, planPoints, ref) {
  planGroup.innerHTML = "";
  if (planPoints.length > 0) {
    const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
    path.setAttribute("d", pointsToPathD(planPoints));
    path.setAttribute("fill", "none");
    path.setAttribute("stroke", "currentColor");
    path.setAttribute("stroke-width", "1.6");
    path.style.color = "var(--ink, #1a1512)";
    planGroup.appendChild(path);
    for (const p of planPoints) {
      const c = document.createElementNS("http://www.w3.org/2000/svg", "circle");
      c.setAttribute("cx", tToX(p.timeS).toFixed(1));
      c.setAttribute("cy", tempToY(p.tempC).toFixed(1));
      c.setAttribute("r", "3.2");
      c.setAttribute("fill", "currentColor");
      c.style.color = "var(--ink, #1a1512)";
      planGroup.appendChild(c);
    }
  }

  refGroup.innerHTML = "";
  if (ref?.curve?.length) {
    const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
    const d = ref.curve
      .map((p, i) => `${i === 0 ? "M" : "L"}${tToX(p.t).toFixed(1)},${tempToY(p.bt).toFixed(1)}`)
      .join(" ");
    path.setAttribute("d", d);
    path.setAttribute("fill", "none");
    path.setAttribute("stroke", "currentColor");
    path.setAttribute("stroke-width", "1.3");
    path.setAttribute("stroke-dasharray", "4 3");
    path.setAttribute("opacity", ".65");
    path.style.color = "var(--ink-2, #5a5048)";
    refGroup.appendChild(path);
    for (const m of ref.milestones ?? []) {
      if (m.tempC === null) continue;
      const c = document.createElementNS("http://www.w3.org/2000/svg", "circle");
      c.setAttribute("cx", tToX(m.timeS).toFixed(1));
      c.setAttribute("cy", tempToY(m.tempC).toFixed(1));
      c.setAttribute("r", "2.6");
      c.setAttribute("fill", "none");
      c.setAttribute("stroke", "currentColor");
      c.setAttribute("stroke-width", "1.2");
      c.style.color = "var(--ink-2, #5a5048)";
      refGroup.appendChild(c);
    }
  }
}

function renderCurve(ledger) {
  const planPoints = buildPlanCurve(state.plan, ledger);
  const ref = state.plan.reference;

  paintCurveInto(
    document.getElementById("plan-curve"),
    document.getElementById("ref-curve"),
    planPoints,
    ref,
  );
  paintCurveInto(
    document.getElementById("plan-curve-live"),
    document.getElementById("ref-curve-live"),
    planPoints,
    ref,
  );
}

export function recompute() {
  const ledger = renderLedger();
  renderCurve(ledger);
  renderBandMarkers();
  autosave();
}

let autosaveAgeTimer = null;
function autosave() {
  const chip = document.getElementById("autosave-status");
  const text = chip.querySelector(".autosave-text");
  chip.classList.remove("saved");
  chip.classList.add("saving");
  text.textContent = "Saving…";

  clearTimeout(autosave._t);
  autosave._t = setTimeout(() => {
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(state.plan));
      const savedAt = Date.now();
      chip.classList.remove("saving");
      chip.classList.add("saved");
      const tick = () => {
        const secs = Math.round((Date.now() - savedAt) / 1000);
        text.textContent = secs < 8 ? "Saved just now" : secs < 60 ? `Saved ${secs}s ago` : `Saved ${Math.round(secs / 60)}m ago`;
      };
      tick();
      clearInterval(autosaveAgeTimer);
      autosaveAgeTimer = setInterval(tick, 5000);
    } catch {
      chip.classList.remove("saving", "saved");
      text.textContent = "Save unavailable";
    }
  }, 400);
}

function loadFromStorage() {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    return raw ? JSON.parse(raw) : null;
  } catch {
    return null;
  }
}

function cultivarAutofill(name) {
  const row = findCultivar(name);
  if (!row) return;
  setValueForName("1.2", row.group);
  setValueForName("1.4", formatDuration(parseRangeMidpoint(row.fcAnchor)));
  setValueForName("1.5", row.profile.join("|"));
  setValueForName("1.7", formatSigned(row.devModS));
  renderFormFromPlan();
}

function wireCultivarDatalist() {
  const list = document.getElementById("cultivar-list");
  list.innerHTML = CULTIVARS.map((c) => `<option value="${c.name}">`).join("");
}

function wireForm() {
  form.addEventListener("input", (e) => {
    const el = e.target;
    if (!el.name) return;
    if (el.type === "radio" && !el.checked) return;
    setValueForName(el.name, el.value);
    if (el.name === "1.1") cultivarAutofill(el.value);
    if (el.name === "2.1") updateBlendVisibility(el.value);
    if (el.name.startsWith("blendComponents.")) updateBlendTotal();
    recompute();
  });
}

function wireDrawers() {
  const overlay = document.getElementById("drawer-overlay");
  const prefill = document.getElementById("panel-prefill");
  const alog = document.getElementById("panel-alog");

  function open(panel) {
    for (const p of [prefill, alog]) p.classList.add("hidden");
    panel.classList.remove("hidden");
    panel.setAttribute("aria-hidden", "false");
    overlay.classList.remove("hidden");
  }
  function closeAll() {
    for (const p of [prefill, alog]) {
      p.classList.add("hidden");
      p.setAttribute("aria-hidden", "true");
    }
    overlay.classList.add("hidden");
  }

  document.getElementById("btn-toggle-prefill").addEventListener("click", () => {
    prefill.classList.contains("hidden") ? open(prefill) : closeAll();
  });
  document.getElementById("btn-toggle-alog").addEventListener("click", () => {
    alog.classList.contains("hidden") ? open(alog) : closeAll();
  });
  overlay.addEventListener("click", closeAll);
  for (const btn of document.querySelectorAll("[data-close-drawer]")) {
    btn.addEventListener("click", closeAll);
  }
}

function wireToolbar() {
  document.getElementById("btn-toggle-fids").addEventListener("click", (e) => {
    const on = document.body.classList.toggle("show-fids");
    e.currentTarget.setAttribute("aria-pressed", String(on));
  });

  document.getElementById("btn-save").addEventListener("click", () => {
    const blob = new Blob([JSON.stringify(state.plan, null, 2)], { type: "application/json" });
    const a = document.createElement("a");
    a.href = URL.createObjectURL(blob);
    a.download = `${(state.plan.fields["0.1"] || "roast-plan").replace(/[^\w-]+/g, "_")}.json`;
    a.click();
    URL.revokeObjectURL(a.href);
  });
  document.getElementById("btn-load").addEventListener("click", () => document.getElementById("file-load").click());
  document.getElementById("file-load").addEventListener("change", async (e) => {
    const file = e.target.files?.[0];
    if (!file) return;
    try {
      const loaded = JSON.parse(await file.text());
      state.plan = { ...blankPlan(), ...loaded };
      renderBlend();
      renderActuators();
      renderFormFromPlan();
      recompute();
    } catch (err) {
      alert(`Could not load plan: ${err.message}`);
    }
  });

  document.getElementById("btn-add-blend").addEventListener("click", () => {
    state.plan.blendComponents.push({ cultivar: "", group: "", process: "", sharePct: "", fcAnchor: "" });
    renderBlend();
    renderFormFromPlan();
    recompute();
  });
  document.getElementById("btn-add-actuator").addEventListener("click", () => {
    state.plan.actuators.push({ time: "", heatPct: "", fanPct: "", expectedBt: "", why: "" });
    renderActuators();
    renderFormFromPlan();
    recompute();
  });
}

function wireSectionNav() {
  const links = [...document.querySelectorAll(".section-nav a")];
  const sections = links
    .map((a) => document.querySelector(a.getAttribute("href")))
    .filter(Boolean);
  if (sections.length === 0) return;

  const observer = new IntersectionObserver(
    (entries) => {
      for (const entry of entries) {
        if (!entry.isIntersecting) continue;
        const id = `#${entry.target.id}`;
        for (const a of links) a.classList.toggle("active", a.getAttribute("href") === id);
      }
    },
    { rootMargin: "-20% 0px -70% 0px" },
  );
  for (const s of sections) observer.observe(s);
}

function init() {
  renderBlend();
  renderActuators();
  wireCultivarDatalist();
  renderBandRanges();
  renderFormFromPlan();
  wireForm();
  wireDrawers();
  wireToolbar();
  wireSectionNav();
  initPrefillPanel({ state, renderBlendRows: renderBlend, renderActuatorRows: renderActuators, renderFormFromPlan, recompute });
  initAlogPanel({ state, recompute });
  initPrint({ beforePrint: renderFormFromPlan });
  recompute();
}

init();