"use strict";

const state = {
  from: null,
  to: null,
  agg: "hour",
  device: "",
  showTemp: true,
  showHum: true,
  meta: null,
};

let chart = null;

const $ = (sel) => document.querySelector(sel);

function cssVar(name) {
  return getComputedStyle(document.documentElement).getPropertyValue(name).trim();
}

function pad(n) {
  return String(n).padStart(2, "0");
}

function toLocalInput(date) {
  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}T${pad(date.getHours())}:${pad(date.getMinutes())}`;
}

function setStatus(ok) {
  const el = $("#status");
  el.classList.toggle("ok", ok === true);
  el.classList.toggle("err", ok === false);
}

function applyPreset(days) {
  const now = new Date();
  let from;
  if (days === "all") {
    const min = state.meta && state.meta.min ? new Date(state.meta.min.replace(" ", "T")) : null;
    from = min && !isNaN(min) ? min : new Date(now.getTime() - 7 * 864e5);
  } else {
    from = new Date(now.getTime() - Number(days) * 864e5);
  }
  state.from = toLocalInput(from);
  state.to = toLocalInput(now);
  $("#from").value = state.from;
  $("#to").value = state.to;
  load();
}

function buildOption(data) {
  const text = cssVar("--text");
  const muted = cssVar("--muted");
  const border = cssVar("--border");
  const tempColor = cssVar("--temp");
  const humColor = cssVar("--hum");
  const series = [];
  const palette = ["#1f6feb", "#e8590c", "#2fb344", "#9c36b5", "#f08c00", "#0ca678"];
  const devices = Object.keys(data.series).sort();
  let pi = 0;

  const humAxis = state.showHum;

  for (const dev of devices) {
    const s = data.series[dev];
    const baseColor = palette[pi % palette.length];
    pi += 1;
    if (state.showTemp) {
      series.push({
        name: `${dev} · °C`,
        type: "line",
        yAxisIndex: 0,
        showSymbol: false,
        smooth: 0.25,
        lineStyle: { width: 2.4, color: tempColor },
        itemStyle: { color: tempColor },
        emphasis: { focus: "series" },
        data: s.t.map((t, i) => [t, s.temperature[i]]),
      });
    }
    if (state.showHum) {
      series.push({
        name: `${dev} · %`,
        type: "line",
        yAxisIndex: 1,
        showSymbol: false,
        smooth: 0.25,
        lineStyle: { width: 1.8, type: "dashed", color: humColor },
        itemStyle: { color: humColor },
        emphasis: { focus: "series" },
        data: s.t.map((t, i) => [t, s.humidity[i]]),
      });
    }
  }

  return {
    backgroundColor: "transparent",
    animationDuration: 300,
    color: palette,
    grid: { left: 6, right: humAxis ? 6 : 6, top: 40, bottom: 62, containLabel: true },
    legend: {
      top: 4,
      type: "scroll",
      textStyle: { color: text, fontSize: 12 },
      inactiveColor: muted,
    },
    tooltip: {
      trigger: "axis",
      backgroundColor: cssVar("--panel"),
      borderColor: border,
      textStyle: { color: text, fontSize: 12 },
      axisPointer: { type: "cross", label: { backgroundColor: muted } },
      valueFormatter: null,
      formatter: (params) => {
        if (!params || !params.length) return "";
        const d = new Date(params[0].value[0]);
        const head = `${d.toLocaleDateString("et-EE")} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
        const lines = params.map((p) => {
          const v = p.value[1];
          const unit = p.seriesName.endsWith("°C") ? " °C" : " %";
          return `<div style="display:flex;justify-content:space-between;gap:14px">
            <span>${p.marker} ${p.seriesName}</span><b>${v == null ? "–" : v + unit}</b></div>`;
        });
        return `<div style="font-weight:600;margin-bottom:4px">${head}</div>${lines.join("")}`;
      },
    },
    xAxis: {
      type: "time",
      axisLine: { lineStyle: { color: border } },
      axisLabel: { color: muted, hideOverlap: true },
      splitLine: { show: false },
    },
    yAxis: [
      {
        type: "value",
        name: "°C",
        scale: true,
        axisLine: { show: false },
        axisLabel: { color: muted },
        splitLine: { lineStyle: { color: border, type: "dashed" } },
      },
      ...(humAxis
        ? [
            {
              type: "value",
              name: "%",
              scale: true,
              position: "right",
              axisLine: { show: false },
              axisLabel: { color: muted },
              splitLine: { show: false },
            },
          ]
        : []),
    ],
    dataZoom: [
      { type: "inside", throttle: 50 },
      { type: "slider", height: 22, bottom: 14, borderColor: border, textStyle: { color: muted }, fillColor: cssVar("--accent-soft") },
    ],
    series,
  };
}

function render(data) {
  const chartEl = $("#chart");
  const hasData = Object.keys(data.series).length > 0 && Object.values(data.series).some((s) => s.t.length);
  $("#hint").hidden = hasData;
  if (!hasData) {
    $("#hint").textContent = "Valitud vahemikus andmeid ei ole. Andur salvestab andmeid alates 2026-09-17.";
  }
  if (!chart) chart = echarts.init(chartEl, null, { renderer: "canvas" });
  chart.setOption(buildOption(data), true);
  chart.resize();
}

async function load() {
  const params = new URLSearchParams({
    from: state.from,
    to: state.to,
    agg: state.agg,
  });
  if (state.device) params.set("device", state.device);
  setStatus(null);
  try {
    const res = await fetch(`/api/temperatuur?${params}`);
    if (!res.ok) throw new Error(await res.text());
    const data = await res.json();
    currentSeries = data.series;
    render(data);
    setStatus(true);
    const f = new Date(state.from.replace(" ", "T"));
    const t = new Date(state.to.replace(" ", "T"));
    $("#range-label").textContent = `${f.toLocaleString("et-EE")} → ${t.toLocaleString("et-EE")}`;
  } catch (err) {
    console.error(err);
    setStatus(false);
    $("#hint").hidden = false;
    $("#hint").textContent = "Andmete laadimine ebaõnnestus.";
  }
}

async function loadMeta() {
  try {
    const res = await fetch("/api/meta");
    if (!res.ok) throw new Error();
    state.meta = await res.json();
    const devs = state.meta.devices.length ? state.meta.devices.join(", ") : "—";
    $("#subtitle").textContent = `Zigbee andurid · ${devs}`;
    if (state.meta.min) {
      $("#range-label").textContent = `Andmed alates ${state.meta.min}`;
    }
  } catch {
    $("#subtitle").textContent = "Zigbee andurid";
  }
}

async function loadLatest() {
  try {
    const res = await fetch("/api/latest");
    if (!res.ok) return;
    const data = await res.json();
    renderCards(data);
  } catch {
    /* vaikne */
  }
}

function renderCards(data) {
  const cards = [];
  for (const r of data.readings) {
    cards.push(`<div class="card temp"><div class="k">🌡️ ${r.device} · temperatuur</div>
      <div class="v">${r.temperature ?? "–"}<small> °C</small></div></div>`);
    cards.push(`<div class="card hum"><div class="k">💧 ${r.device} · niiskus</div>
      <div class="v">${r.humidity ?? "–"}<small> %</small></div></div>`);
  }
  if (data.open_faults.length) {
    const items = data.open_faults
      .map((f) => `<div>⚠️ <b>${f.device}</b> · ${f.tyyp}${f.detail ? " · " + f.detail : ""}</div>`)
      .join("");
    cards.push(`<div class="card wide"><div class="k">Lahtised häired (${data.open_faults.length})</div>
      <div style="font-size:13px;margin-top:6px;line-height:1.7">${items}</div></div>`);
  }
  $("#cards").innerHTML = cards.join("");
}

function setTheme(theme) {
  document.documentElement.setAttribute("data-theme", theme);
  localStorage.setItem("nutikodu-theme", theme);
  $("#theme-toggle").textContent = theme === "dark" ? "☀️" : "🌙";
  const meta = $("#meta-theme");
  if (meta) meta.setAttribute("content", theme === "dark" ? "#0e1116" : "#1f6feb");
  if (chart) chart.setOption(buildOption({ series: currentSeries }), true);
}

let currentSeries = {};

function init() {
  const saved = localStorage.getItem("nutikodu-theme");
  const prefersDark = window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches;
  setTheme(saved || (prefersDark ? "dark" : "light"));
  $("#theme-toggle").addEventListener("click", () => {
    setTheme(document.documentElement.getAttribute("data-theme") === "dark" ? "light" : "dark");
  });

  document.querySelectorAll("#presets button").forEach((btn) => {
    btn.addEventListener("click", () => {
      document.querySelectorAll("#presets button").forEach((b) => b.classList.remove("active"));
      btn.classList.add("active");
      applyPreset(btn.dataset.days);
    });
  });

  document.querySelectorAll("#agg button").forEach((btn) => {
    btn.addEventListener("click", () => {
      document.querySelectorAll("#agg button").forEach((b) => b.classList.remove("active"));
      btn.classList.add("active");
      state.agg = btn.dataset.agg;
      load();
    });
  });

  $("#show-temp").addEventListener("change", (e) => { state.showTemp = e.target.checked; load(); });
  $("#show-hum").addEventListener("change", (e) => { state.showHum = e.target.checked; load(); });
  $("#apply").addEventListener("click", () => {
    state.from = $("#from").value;
    state.to = $("#to").value;
    document.querySelectorAll("#presets button").forEach((b) => b.classList.remove("active"));
    load();
  });

  window.addEventListener("resize", () => chart && chart.resize());
  window.addEventListener("orientationchange", () => setTimeout(() => chart && chart.resize(), 250));
  window.addEventListener("load", () => chart && chart.resize());

  loadMeta().then(() => applyPreset(7));
  loadLatest();
  setInterval(loadLatest, 60000);
}

document.addEventListener("DOMContentLoaded", init);