const TOKEN_KEY = "gaokao_admin_dashboard_token";

const state = {
  charts: {},
  payload: null,
  range: "7d",
  loading: false,
  titleTapCount: 0,
  titleTapTimer: null,
};

function resolveApiBase() {
  const raw = document.getElementById("api-base").value.trim();
  return raw || window.location.origin;
}

function formatMoney(cents) {
  return `¥${(Number(cents || 0) / 100).toFixed(2)}`;
}

function setMessage(text, tone) {
  const el = document.getElementById("message");
  el.textContent = text;
  el.className = "message" + (tone ? " " + tone : "");
}

function setError(text) {
  const el = document.getElementById("error");
  el.textContent = text || "";
}

function setStatus(state_, title, meta) {
  const dot = document.getElementById("status-dot");
  const titleEl = document.getElementById("status-title");
  const metaEl = document.getElementById("status-meta");
  const wrap = document.getElementById("system-status");
  dot.className = "status-dot " + state_;
  titleEl.textContent = title;
  metaEl.textContent = meta;
  wrap.className = "system-status " + state_;
}

function markCardsLoading() {
  document.querySelectorAll("[data-card]").forEach((card) => {
    card.classList.remove("empty");
    card.classList.add("loading");
  });
}

function markCardsEmpty() {
  document.querySelectorAll("[data-card]").forEach((card) => {
    card.classList.remove("loading");
    card.classList.add("empty");
  });
}

function setChartEmpty(chartId, label) {
  const node = document.getElementById(chartId);
  if (!node) return;
  node.innerHTML = `<div class="chart-empty"><span class="label">${label || "等待加载数据"}</span></div>`;
  delete state.charts[chartId];
}

function getToken() {
  return document.getElementById("token").value.trim();
}

function setToken(token) {
  document.getElementById("token").value = token || "";
  if (token) {
    window.sessionStorage.setItem(TOKEN_KEY, token);
  } else {
    window.sessionStorage.removeItem(TOKEN_KEY);
  }
}

async function loginAndStoreToken() {
  const username = document.getElementById("username").value.trim();
  const password = document.getElementById("password").value;
  if (!username || !password) {
    throw new Error("请输入用户名和密码，或直接粘贴 Bearer Token。");
  }

  const resp = await fetch(`${resolveApiBase()}/api/auth/login`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ username, password }),
  });

  if (!resp.ok) {
    throw new Error(`登录失败: HTTP ${resp.status}`);
  }

  const body = await resp.json();
  if (!body.access_token) {
    throw new Error("登录响应缺少 access_token");
  }

  setToken(body.access_token);
  return body.access_token;
}

function renderSummary(summary) {
  const totalOrders = Number(summary.total_orders ?? 0);
  const totalRevenue = Number(summary.total_revenue_cents ?? 0);
  const totalUsers = Number(summary.total_users ?? 0);
  const ordersToday = Number(summary.orders_today ?? 0);
  const orders7d = Number(summary.orders_7d ?? 0);
  const orders30d = Number(summary.orders_30d ?? 0);

  document.getElementById("total-orders").textContent = String(totalOrders);
  document.getElementById("total-revenue").textContent =
    formatMoney(totalRevenue);
  document.getElementById("total-users").textContent = String(totalUsers);
  document.getElementById("orders-subtitle").textContent =
    `今日 ${ordersToday} / 7d ${orders7d} / 30d ${orders30d}`;
  document.getElementById("revenue-subtitle").textContent =
    `今日 ${formatMoney(summary.revenue_today_cents)} / 7d ${formatMoney(summary.revenue_7d_cents)} / 30d ${formatMoney(summary.revenue_30d_cents)}`;

  const pending = Number(summary.pending_orders ?? 0);
  const pendingOverdue = Number(summary.pending_overdue_24h ?? 0);
  const pendingMissing = Number(summary.pending_missing_intake ?? 0);
  document.getElementById("pending-orders").textContent = String(pending);

  // 待处理多口径: 至少有一个非零才展开
  const breakdown = document.getElementById("pending-breakdown");
  const overdueTag = document.getElementById("pending-overdue-tag");
  const missingTag = document.getElementById("pending-missing-tag");
  const hasAny = pendingOverdue > 0 || pendingMissing > 0;
  if (breakdown) breakdown.hidden = !hasAny;
  if (overdueTag) {
    overdueTag.hidden = pendingOverdue <= 0;
    overdueTag.classList.toggle("pending-tag-zero", pendingOverdue <= 0);
    const overdueEl = document.getElementById("pending-overdue-24h");
    if (overdueEl) overdueEl.textContent = String(pendingOverdue);
  }
  if (missingTag) {
    missingTag.hidden = pendingMissing <= 0;
    missingTag.classList.toggle("pending-tag-zero", pendingMissing <= 0);
    const missingEl = document.getElementById("pending-missing-intake");
    if (missingEl) missingEl.textContent = String(pendingMissing);
  }
}

function clearCardEmptyStates() {
  document.querySelectorAll("[data-card]").forEach((card) => {
    card.classList.remove("empty");
    card.classList.remove("loading");
  });
}

function ensureChart(id) {
  const host = document.getElementById(id);
  if (!host) return null;
  if (!state.charts[id]) {
    state.charts[id] = echarts.init(host);
  }
  return state.charts[id];
}

function renderTrend(trends) {
  const points = Array.isArray(trends?.[state.range])
    ? trends?.[state.range]
    : [];
  if (points.length === 0) {
    setChartEmpty(
      "trend-chart",
      state.range === "30d" ? "近 30 天暂无订单活动" : "近 7 天暂无订单活动",
    );
    document.getElementById("trend-title").textContent =
      state.range === "30d" ? "30 天趋势" : "7 天趋势";
    return;
  }
  const chart = ensureChart("trend-chart");
  document.getElementById("trend-title").textContent =
    state.range === "30d" ? "30 天趋势" : "7 天趋势";
  chart.setOption({
    tooltip: { trigger: "axis" },
    legend: { data: ["订单数", "收入(元)"] },
    grid: { left: 48, right: 48, top: 48, bottom: 32 },
    xAxis: {
      type: "category",
      boundaryGap: false,
      data: points.map((item) => item.date),
    },
    yAxis: [
      { type: "value", name: "订单数" },
      { type: "value", name: "收入(元)" },
    ],
    series: [
      {
        name: "订单数",
        type: "line",
        smooth: true,
        data: points.map((item) => item.orders ?? 0),
      },
      {
        name: "收入(元)",
        type: "line",
        smooth: true,
        yAxisIndex: 1,
        data: points.map((item) => Number(item.revenue_cents ?? 0) / 100),
      },
    ],
  });
}

function renderBarChart(chartId, emptyLabel, dataMap, color) {
  const entries = Object.entries(dataMap || {});
  if (
    entries.length === 0 ||
    entries.every(([, value]) => Number(value || 0) === 0)
  ) {
    setChartEmpty(chartId, emptyLabel);
    return;
  }
  const chart = ensureChart(chartId);
  chart.setOption({
    tooltip: { trigger: "axis" },
    grid: { left: 48, right: 24, top: 32, bottom: 48 },
    xAxis: {
      type: "category",
      axisLabel: { interval: 0, rotate: entries.length > 4 ? 20 : 0 },
      data: entries.map(([label]) => label),
    },
    yAxis: { type: "value", minInterval: 1 },
    series: [
      {
        name: chartId,
        type: "bar",
        data: entries.map(([, value]) => value ?? 0),
        itemStyle: { color },
        barMaxWidth: 48,
      },
    ],
  });
}

function renderDistributions(payload) {
  renderBarChart(
    "status-chart",
    "暂无订单状态分布",
    payload.by_status,
    "#2563eb",
  );
  renderBarChart("source-chart", "暂无来源分布", payload.by_source, "#7c3aed");
  renderBarChart(
    "service-chart",
    "暂无服务版本分布",
    payload.by_service_version,
    "#059669",
  );
}

function updateRangeButtons() {
  const isThirty = state.range === "30d";
  document.getElementById("range-7d").className = isThirty
    ? "range-btn secondary"
    : "range-btn active-range";
  document.getElementById("range-30d").className = isThirty
    ? "range-btn active-range"
    : "range-btn secondary";
}

async function fetchDashboard(token) {
  const resp = await fetch(`${resolveApiBase()}/api/stats/dashboard`, {
    headers: {
      Authorization: `Bearer ${token}`,
    },
  });

  if (!resp.ok) {
    throw new Error(`数据加载失败：HTTP ${resp.status}`);
  }
  return resp.json();
}

function setDevSeedPanelVisible(visible) {
  const panel = document.getElementById("dev-seed-panel");
  if (!panel) return;
  panel.classList.toggle("hidden", !visible);
}

async function postDevSeed(scenario) {
  const token = getToken() || window.sessionStorage.getItem(TOKEN_KEY) || "";
  if (!token) {
    throw new Error("请先登录后台，再使用隐藏测试造数工具。");
  }
  const resp = await fetch(`${resolveApiBase()}/api/admin/orders/dev-seed`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      Authorization: `Bearer ${token}`,
    },
    body: JSON.stringify({ scenario }),
  });
  const body = await resp.json();
  if (!resp.ok) {
    throw new Error(
      body?.message || body?.detail?.reason || `造数失败：HTTP ${resp.status}`,
    );
  }
  return body;
}

function renderDashboard(payload) {
  state.payload = payload;
  clearCardEmptyStates();
  renderSummary(payload.summary || {});
  renderTrend(payload.trends || {});
  renderDistributions(payload);
  updateRangeButtons();
  const generatedAt = payload.generated_at || "刚刚";
  document.getElementById("generated-at-hint")?.remove();
  setStatus(
    "online",
    "已连接 · 数据已加载",
    `更新时间：${generatedAt} · 数据范围：${state.range === "30d" ? "30 天" : "7 天"}`,
  );
}

async function loadDashboard({ loginFirst = false } = {}) {
  if (state.loading) return;
  state.loading = true;
  setError("");
  setMessage(loginFirst ? "登录中..." : "加载中...", "loading");
  setStatus(
    "loading",
    "正在连接...",
    loginFirst ? "正在登录并拉取数据" : "正在拉取最新数据",
  );
  markCardsLoading();

  try {
    let token = getToken();
    if (!token && loginFirst) {
      token = await loginAndStoreToken();
      setMessage("登录成功，开始加载仪表盘...", "success");
    }
    if (!token) {
      throw new Error("缺少 JWT，请先登录或粘贴 Bearer Token。");
    }

    const payload = await fetchDashboard(token);
    renderDashboard(payload);
    setMessage("仪表盘加载成功", "success");
  } catch (error) {
    setError(error.message || String(error));
    setMessage("加载失败，请检查认证或服务状态。", "error");
    setStatus("error", "连接失败", error.message || "请检查登录状态或刷新");
    markCardsEmpty();
    setChartEmpty("trend-chart", "登录后展示订单与收入趋势");
    setChartEmpty("status-chart", "暂无订单状态分布");
    setChartEmpty("source-chart", "暂无来源分布");
    setChartEmpty("service-chart", "暂无服务版本分布");
  } finally {
    state.loading = false;
  }
}

function bindRangeButton(id, range) {
  document.getElementById(id).addEventListener("click", () => {
    state.range = range;
    updateRangeButtons();
    if (state.payload) {
      renderTrend(state.payload.trends || {});
    }
  });
}

function logout() {
  setToken("");
  state.payload = null;
  Object.keys(state.charts).forEach((id) => setChartEmpty(id, "等待加载数据"));
  markCardsEmpty();
  setStatus("loading", "尚未连接", "登录后查看核心经营指标");
  setMessage("已退出登录，请重新登录。", "");
}

function bootstrap() {
  const cachedToken = window.sessionStorage.getItem(TOKEN_KEY);
  if (cachedToken && !getToken()) {
    setToken(cachedToken);
  }

  const params = new URLSearchParams(window.location.search);
  if (params.get("seed-tools") === "1") {
    setDevSeedPanelVisible(true);
  }

  window.addEventListener("resize", () => {
    Object.values(state.charts).forEach((chart) => chart && chart.resize());
  });

  document.getElementById("login-btn").addEventListener("click", () => {
    loadDashboard({ loginFirst: true });
  });
  document.getElementById("refresh-btn").addEventListener("click", () => {
    loadDashboard({ loginFirst: false });
  });
  document.getElementById("quick-refresh-btn").addEventListener("click", () => {
    loadDashboard({ loginFirst: false });
  });
  document.getElementById("quick-logout-btn").addEventListener("click", logout);
  bindRangeButton("range-7d", "7d");
  bindRangeButton("range-30d", "30d");

  const title = document.getElementById("dashboard-title");
  title?.addEventListener("click", () => {
    state.titleTapCount += 1;
    if (state.titleTapTimer) {
      window.clearTimeout(state.titleTapTimer);
    }
    state.titleTapTimer = window.setTimeout(() => {
      state.titleTapCount = 0;
    }, 1200);
    if (state.titleTapCount >= 5) {
      state.titleTapCount = 0;
      setDevSeedPanelVisible(true);
      setMessage("隐藏测试造数工具已展开。", "success");
    }
  });

  document
    .getElementById("dev-seed-close-btn")
    ?.addEventListener("click", () => {
      setDevSeedPanelVisible(false);
    });
  document
    .getElementById("dev-seed-overdue-btn")
    ?.addEventListener("click", async () => {
      try {
        setMessage("正在补造 1 笔超时待办…", "loading");
        const body = await postDevSeed("overdue_pending_once");
        setMessage(
          `已补造超时待办：${(body.created_ids || []).join(", ") || "1 笔"}`,
          "success",
        );
        await loadDashboard({ loginFirst: false });
      } catch (error) {
        setError(error.message || String(error));
        setMessage("隐藏测试造数失败。", "error");
      }
    });
  document
    .getElementById("dev-seed-clean-btn")
    ?.addEventListener("click", async () => {
      try {
        setMessage("正在清理演示造数…", "loading");
        const body = await postDevSeed("cleanup_demo_seed");
        setMessage(
          `已清理演示造数：${body.detail?.deleted_count ?? (body.deleted_ids || []).length} 笔`,
          "success",
        );
        await loadDashboard({ loginFirst: false });
      } catch (error) {
        setError(error.message || String(error));
        setMessage("清理演示造数失败。", "error");
      }
    });

  updateRangeButtons();
  setStatus("loading", "尚未连接", "登录后查看核心经营指标");
}

window.addEventListener("DOMContentLoaded", bootstrap);