"use strict";
// Thermograph single-day detail subpage — for one day + location, shows the value
// at every percentile tier boundary in that day-of-year's ±7-day climate window,
// and where the observed values land. Talks to /api/v2/day + /api/v2/geocode.
// Self-contained; re-declares the small shared tier constants (like calendar.js)
// so the page stays independent of app.js.

const TIER_COLORS = {
  "rec-hot": "#7d1a49", "very-hot": "#db2777", "hot": "#f472b6", "warm": "#f9a8d4",
  "normal": "#f0dce8",
  "cool": "#cbb6f7", "cold": "#9b6ef0", "very-cold": "#6d28d9", "rec-cold": "#3b0764",
};
const PRECIP_COLORS = {
  "wet-1": "#f3e8ff", "wet-2": "#e9d5ff", "wet-3": "#d8b4fe", "wet-4": "#c084fc", "wet-5": "#a855f7",
  "wet-6": "#9333ea", "wet-7": "#7e22ce", "wet-8": "#6b21a8", "wet-9": "#4c1d95",
};
const DRY_COLOR = "#cbb26a";

const fmtTemp = (v) => (v == null ? "—" : `${Math.round(v)}°`);
const fmtPrecip = (v) => (v == null ? "—" : `${v.toFixed(2)}"`);
const fmtWind = (v) => (v == null ? "—" : `${Math.round(v)} mph`);
const fmtHumid = (v) => (v == null ? "—" : `${v.toFixed(1)} g/m³`);
const ord = (n) => {
  const r = Math.round(n), s = ["th", "st", "nd", "rd"], v = r % 100;
  return r + (s[(v - 20) % 10] || s[v] || s[0]);
};

// Color a tier the same way the calendar cell would be colored for it.
const tierColor = (c) => (c === "dry" ? DRY_COLOR : TIER_COLORS[c] || PRECIP_COLORS[c] || "");

// Monochrome line icons (currentColor) — no emoji, matching the site's dark look.
const WX = (paths) =>
  `<svg class="wx" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">${paths}</svg>`;
const WX_CLOUD = `<path d="M20 16.6A5 5 0 0 0 18 7h-1.26A8 8 0 1 0 4 15.25"/>`;
const WX_ICONS = {
  sun: WX(`<circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.2" y1="4.2" x2="5.6" y2="5.6"/><line x1="18.4" y1="18.4" x2="19.8" y2="19.8"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.2" y1="19.8" x2="5.6" y2="18.4"/><line x1="18.4" y1="5.6" x2="19.8" y2="4.2"/>`),
  drizzle: WX(`${WX_CLOUD}<line x1="8" y1="19" x2="8" y2="21"/><line x1="16" y1="19" x2="16" y2="21"/><line x1="12" y1="20" x2="12" y2="22"/>`),
  rain: WX(`${WX_CLOUD}<line x1="8" y1="19" x2="8" y2="22"/><line x1="16" y1="19" x2="16" y2="22"/><line x1="12" y1="19" x2="12" y2="23"/>`),
  storm: WX(`<path d="M19 16.9A5 5 0 0 0 18 7h-1.26a8 8 0 1 0-11.62 9"/><polyline points="13 11 9 17 15 17 11 23"/>`),
  snow: WX(`<path d="M20 17.6A5 5 0 0 0 18 8h-1.26A8 8 0 1 0 4 16.25"/><line x1="8" y1="18" x2="8" y2="18"/><line x1="12" y1="20" x2="12" y2="20"/><line x1="16" y1="18" x2="16" y2="18"/><line x1="12" y1="16" x2="12" y2="16"/>`),
};

// Plain-language "what the day was like" descriptor from the observed values —
// mirrors the calendar tooltip. (No dry-streak here, so no-rain days read "clear".)
function weatherType(t, p) {
  const wet = p != null && p >= 0.01;
  const freezing = t != null && t <= 34;
  const temp = t == null ? "" :
    t >= 95 ? "Scorching" : t >= 85 ? "Hot" : t >= 72 ? "Warm" :
    t >= 58 ? "Mild" : t >= 45 ? "Cool" : t >= 32 ? "Cold" : "Frigid";
  let sky, icon;
  if (wet && freezing) { sky = p >= 0.3 ? "heavy snow" : "snow"; icon = WX_ICONS.snow; }
  else if (wet && p >= 1.0) { sky = "downpour"; icon = WX_ICONS.storm; }
  else if (wet && p >= 0.3) { sky = "rain"; icon = WX_ICONS.rain; }
  else if (wet) { sky = "light rain"; icon = WX_ICONS.drizzle; }
  else { sky = "clear"; icon = WX_ICONS.sun; }
  const text = !temp ? sky : wet ? `${temp}, ${sky}` : `${temp} & ${sky}`;
  return { icon, text: text.charAt(0).toUpperCase() + text.slice(1) };
}

let selected = null;   // {lat, lon}
let curDate = null;    // "YYYY-MM-DD" currently shown
let latest = null;     // newest date available in the record
const todayISO = () => new Date().toISOString().slice(0, 10);

const placeholder = document.getElementById("day-placeholder");
const dayHead = document.getElementById("day-head");
const dayBody = document.getElementById("day-body");
const dateInput = document.getElementById("date-input");

// ---- location picker ----
// The Find button opens the shared modal map picker; choosing a spot loads it.
const findBtn = document.getElementById("find-btn");
const locLabel = document.getElementById("loc-label");
findBtn.innerHTML = `${window.LocationPicker.PIN_ICON} <span>Find a location</span>`;
findBtn.addEventListener("click", () => {
  window.LocationPicker.open(selected, (lat, lon) => { selected = { lat, lon }; fetchDay(); });
});

// ---- date navigation ----
dateInput.addEventListener("change", () => { if (dateInput.value) { curDate = dateInput.value; fetchDay(); } });
document.getElementById("prev-day").addEventListener("click", () => stepDay(-1));
document.getElementById("next-day").addEventListener("click", () => stepDay(1));

function stepDay(delta) {
  if (!curDate) return;
  const d = new Date(curDate + "T00:00:00");
  d.setDate(d.getDate() + delta);
  const iso = d.toISOString().slice(0, 10);
  if (iso > todayISO()) return;   // don't step past today
  curDate = iso;
  fetchDay();
}

// ---- fetch + render ----
let daySeq = 0;   // supersedes an in-flight load when the user picks a new spot/date

async function fetchDay() {
  if (!selected) return;
  const dateQ = curDate ? `&date=${curDate}` : "";
  history.replaceState(null, "", `#lat=${selected.lat.toFixed(5)}&lon=${selected.lon.toFixed(5)}${curDate ? `&date=${curDate}` : ""}`);
  placeholder.hidden = true;
  dayHead.hidden = false;
  const seq = ++daySeq;
  // Delay the spinner: a cache-served render lands in a few ms, so blanking the
  // page immediately would just flash. Only a slow (network) load shows it.
  const spin = setTimeout(() => {
    if (seq !== daySeq) return;
    dayHead.innerHTML = `<p class="spinner">Building the percentile breakdown…</p>`;
    dayBody.innerHTML = "";
  }, 150);
  let data;
  try {
    // Stale-while-revalidate: a stale cached copy renders immediately; the update
    // callback repaints if the background revalidation finds new data.
    data = await window.Thermograph.getJSON(
      `api/v2/day?lat=${selected.lat}&lon=${selected.lon}${dateQ}`, window.Thermograph.TTL.day,
      false, (upd) => { if (seq === daySeq) finishDay(upd); });
  } catch (err) {
    clearTimeout(spin);
    if (seq !== daySeq) return;
    dayHead.innerHTML = `<p class="error">${err.message}</p>`;
    dayBody.innerHTML = "";
    return;
  }
  clearTimeout(spin);
  if (seq !== daySeq) return;
  finishDay(data);
}

function finishDay(data) {
  latest = data.latest;
  curDate = data.detail.date;
  dateInput.value = curDate;
  // Allow navigating up to today (recent days beyond the archive come from the
  // forecast bundle), not just the latest fully-archived day.
  dateInput.max = todayISO();
  document.getElementById("next-day").disabled = curDate >= todayISO();
  window.Thermograph.saveLastLocation(selected.lat, selected.lon, curDate);
  render(data);
  window.Thermograph.prefetchViews(selected.lat, selected.lon, "day");  // warm weekly/calendar/forecast
}

function render(data) {
  const d = data.detail;
  const cell = data.cell;
  const place = data.place || `${cell.center_lat.toFixed(3)}, ${cell.center_lon.toFixed(3)}`;
  locLabel.textContent = place;
  locLabel.hidden = false;
  findBtn.innerHTML = `${window.LocationPicker.PIN_ICON} <span>Change location</span>`;
  const dt = new Date(d.date + "T00:00:00");
  const nice = dt.toLocaleDateString(undefined, { weekday: "long", year: "numeric", month: "long", day: "numeric" });
  const yrs = d.year_range ? `${d.year_range[0]}–${d.year_range[1]}` : "—";
  // Weather summary from the observed high + precip (omitted for days with no obs yet).
  const th = d.metrics.tmax.obs ? d.metrics.tmax.obs.value : null;
  const pr = d.metrics.precip.obs ? d.metrics.precip.obs.value : null;
  const wt = th != null || pr != null ? weatherType(th, pr) : null;
  dayHead.innerHTML = `
    <h2>${nice}</h2>
    ${wt ? `<p class="day-weather">${wt.icon} ${wt.text}</p>` : ""}
    <p class="meta">${place}
       · ${d.n_samples.toLocaleString()} days around this date (${yrs})</p>`;

  dayBody.innerHTML = [
    ladderCard("Daily high", d.metrics.tmax, fmtTemp, "temp"),
    ladderCard("Daily low", d.metrics.tmin, fmtTemp, "temp"),
    ladderCard("Feels like", d.metrics.feels, fmtTemp, "temp"),
    ladderCard("Humidity", d.metrics.humid, fmtHumid, "temp"),
    ladderCard("Wind speed", d.metrics.wind, fmtWind, "temp"),
    ladderCard("Wind gust", d.metrics.gust, fmtWind, "temp"),
    ladderCard("Precipitation", d.metrics.precip, fmtPrecip, "precip"),
  ].join("");
}

// One metric card: an observed summary line + the tier ladder (highest tier on
// top). The tier the observed value falls into is highlighted with its value.
function ladderCard(title, m, fmt, kind) {
  if (!m || !m.ladder) return "";
  const obs = m.obs;
  const activeClass = obs ? obs.class : null;

  let summary;
  if (obs) {
    const pct = obs.percentile == null ? "" : ` · ${ord(obs.percentile)} pct`;
    summary = `<span class="day-obs" style="--cat:${tierColor(obs.class)}">${fmt(obs.value)}</span>
      <span class="day-obs-meta">${obs.grade}${pct}</span>`;
  } else {
    summary = `<span class="day-obs-meta">No observation for this day yet</span>`;
  }

  // Left: a per-metric summary. Right: the bold, right-aligned Historical Range.
  const noteLeft = kind === "temp"
    ? `median ${fmt(m.ladder.median)}`
    : `${m.ladder.rain_days.toLocaleString()} rain days · dry ${m.ladder.dry_pct}%`;
  const note = `<span class="ladder-note-left">${noteLeft}</span>` +
    `<span class="ladder-range">Historical Range ${fmt(m.ladder.min)}–${fmt(m.ladder.max)}</span>`;

  const rows = m.ladder.tiers.map((t) => {
    const active = t.c === activeClass ? " active" : "";
    // Dry has no rain percentile — leave that column blank and show the threshold
    // as the value. Other tiers show their percentile range and value range.
    let val, pct = t.range;
    if (t.c === "dry") { val = t.range; pct = ""; }
    else if (t.hi == null) val = `> ${fmt(t.lo)}`;   // top tier: strictly beyond p99
    else if (t.lo == null) val = `< ${fmt(t.hi)}`;   // bottom tier: strictly below p1
    else val = `${fmt(t.lo)}–${fmt(t.hi)}`;
    const marker = t.c === activeClass && obs
      ? `<span class="ladder-mark">◀ ${fmt(obs.value)}</span>` : "";
    return `<div class="ladder-row${active}">
      <span class="ladder-sw" style="background:${tierColor(t.c)}"></span>
      <span class="ladder-label" style="--cat:${tierColor(t.c)}">${t.label}</span>
      <span class="ladder-pct">${pct}</span>
      <span class="ladder-val">${val}</span>
      <span class="ladder-mk">${marker}</span>
    </div>`;
  }).join("");

  return `<section class="ladder-card">
    <div class="ladder-head">
      <h3>${title}</h3>
      <div class="ladder-summary">${summary}</div>
    </div>
    <p class="ladder-note">${note}</p>
    <div class="ladder">${rows}</div>
  </section>`;
}

// ---- restore (hash from a shared link, else the last place you looked at) ----
(function restore() {
  const loc = window.Thermograph.loadLastLocation();
  if (loc) {
    selected = { lat: loc.lat, lon: loc.lon };
    curDate = loc.date || todayISO();   // default to today when no date is given
    fetchDay();
  }
})();