import { apiFetch } from "./api.js";
import { dom } from "./dom.js";
import { formatValue } from "./points.js";
import { state } from "./state.js";
import { loadUnits } from "./units.js";

const SIGNAL_ROLES = ["rem", "run", "flt"];
const ROLE_LABELS = { rem: "REM", run: "RUN", flt: "FLT" };

export function sigDotClass(role, quality, valueText) {
  if (!quality || quality.toLowerCase() !== "good") return "sig-dot sig-warn";
  const v = String(valueText ?? "").trim().toLowerCase();
  const on = v === "1" || v === "true" || v === "on";
  if (!on) return "sig-dot";
  return role === "flt" ? "sig-dot sig-fault" : "sig-dot sig-on";
}

function runtimeBadge(runtime) {
  if (!runtime) return '<span class="badge offline">OFFLINE</span>';
  if (runtime.comm_locked) return '<span class="badge offline">COMM ERR</span>';
  if (runtime.fault_locked) return '<span class="badge danger">FAULT</span>';
  const labels = { stopped: "STOPPED", running: "RUNNING", distributor_running: "DIST RUN", fault_locked: "FAULT", comm_locked: "COMM ERR" };
  const cls = { stopped: "", running: "online", distributor_running: "online", fault_locked: "danger", comm_locked: "offline" };
  return `<span class="badge ${cls[runtime.state] ?? ""}">${labels[runtime.state] ?? runtime.state}</span>`;
}

export function renderOpsUnits() {
  if (!dom.opsUnitList) return;
  dom.opsUnitList.innerHTML = "";

  if (!state.units.length) {
    dom.opsUnitList.innerHTML = '<div class="muted" style="padding:12px">暂无控制单元</div>';
    return;
  }

  state.units.forEach((unit) => {
    const runtime = state.runtimes.get(unit.id);
    const item = document.createElement("div");
    item.className = `ops-unit-item${state.selectedOpsUnitId === unit.id ? " selected" : ""}`;
    item.innerHTML = `
      <div class="ops-unit-item-name">${unit.code} / ${unit.name}</div>
      <div class="ops-unit-item-meta">
        ${runtimeBadge(runtime)}
        <span class="badge ${unit.enabled ? "" : "offline"}">${unit.enabled ? "EN" : "DIS"}</span>
        ${runtime ? `<span class="muted">Acc ${Math.floor(runtime.accumulated_run_sec / 1000)}s</span>` : ""}
      </div>
      <div class="ops-unit-item-actions"></div>
    `;
    item.addEventListener("click", () => selectOpsUnit(unit.id));

    const actions = item.querySelector(".ops-unit-item-actions");

    const isAutoOn = runtime?.auto_enabled;
    const autoBtn = document.createElement("button");
    autoBtn.className = isAutoOn ? "danger" : "secondary";
    autoBtn.textContent = isAutoOn ? "Stop Auto" : "Start Auto";
    autoBtn.title = isAutoOn ? "停止自动控制" : "启动自动控制";
    autoBtn.addEventListener("click", (e) => {
      e.stopPropagation();
      apiFetch(`/api/control/unit/${unit.id}/${isAutoOn ? "stop-auto" : "start-auto"}`, { method: "POST" })
        .then(() => loadUnits()).catch(() => {});
    });
    actions.append(autoBtn);

    if (runtime?.manual_ack_required) {
      const ackBtn = document.createElement("button");
      ackBtn.className = "danger";
      ackBtn.textContent = "Ack Fault";
      ackBtn.title = "人工确认解除故障锁定";
      ackBtn.addEventListener("click", (e) => {
        e.stopPropagation();
        apiFetch(`/api/control/unit/${unit.id}/ack-fault`, { method: "POST" })
          .then(() => loadUnits()).catch(() => {});
      });
      actions.append(ackBtn);
    }

    dom.opsUnitList.appendChild(item);
  });
}

async function selectOpsUnit(unitId) {
  state.selectedOpsUnitId = unitId === state.selectedOpsUnitId ? null : unitId;
  renderOpsUnits();

  if (!state.selectedOpsUnitId) {
    await loadAllEquipmentCards();
    return;
  }

  dom.opsEquipmentArea.innerHTML = '<div class="muted ops-placeholder">加载中...</div>';
  state.opsPointEls.clear();

  const detail = await apiFetch(`/api/unit/${state.selectedOpsUnitId}/detail`);
  renderOpsEquipments(detail.equipments || []);
}

export async function loadAllEquipmentCards() {
  if (!dom.opsEquipmentArea) return;
  if (!state.units.length) {
    dom.opsEquipmentArea.innerHTML = '<div class="muted ops-placeholder">暂无控制单元</div>';
    return;
  }

  dom.opsEquipmentArea.innerHTML = '<div class="muted ops-placeholder">加载中...</div>';
  state.opsPointEls.clear();

  const details = await Promise.all(
    state.units.map((u) => apiFetch(`/api/unit/${u.id}/detail`).catch(() => ({ equipments: [] })))
  );
  const allEquipments = details.flatMap((d) => d.equipments || []);
  renderOpsEquipments(allEquipments);
}

function renderOpsEquipments(equipments) {
  dom.opsEquipmentArea.innerHTML = "";
  if (!equipments.length) {
    dom.opsEquipmentArea.innerHTML = '<div class="muted ops-placeholder">该单元下暂无设备</div>';
    return;
  }

  equipments.forEach((eq) => {
    const card = document.createElement("div");
    card.className = "ops-eq-card";

    // Build role → point map
    const roleMap = {};
    (eq.points || []).forEach((p) => {
      if (p.signal_role) roleMap[p.signal_role] = p;
    });

    // Signal rows HTML (placeholders; WS will fill values)
    const signalRowsHtml = SIGNAL_ROLES.map((role) => {
      const point = roleMap[role];
      if (!point) return "";
      return `
        <div class="ops-signal-row">
          <span class="ops-signal-label">${ROLE_LABELS[role] || role}</span>
          <span class="sig-dot sig-warn" data-ops-dot="${point.id}" data-ops-role="${role}"></span>
        </div>`;
    }).join("");

    const canControl = eq.kind === "coal_feeder" || eq.kind === "distributor";

    card.innerHTML = `
      <div class="ops-eq-card-head">
        <strong title="${eq.name}">${eq.code}</strong>
        <span class="badge">${eq.kind || "--"}</span>
      </div>
      <div class="ops-signal-rows">${signalRowsHtml || '<span class="muted" style="font-size:11px;padding:2px 0">无绑定信号</span>'}</div>
      ${canControl ? `<div class="ops-eq-card-actions" data-unit-id="${eq.unit_id || ""}"></div>` : ""}
    `;

    if (canControl) {
      const actions = card.querySelector(".ops-eq-card-actions");
      const autoOn = !!(eq.unit_id && state.runtimes.get(eq.unit_id)?.auto_enabled);
      const startBtn = document.createElement("button");
      startBtn.className = "secondary";
      startBtn.textContent = "Start";
      startBtn.disabled = autoOn;
      startBtn.title = autoOn ? "自动控制运行中，请先停止自动" : "";
      startBtn.addEventListener("click", () =>
        apiFetch(`/api/control/equipment/${eq.id}/start`, { method: "POST" }).catch(() => {})
      );
      const stopBtn = document.createElement("button");
      stopBtn.className = "danger";
      stopBtn.textContent = "Stop";
      stopBtn.disabled = autoOn;
      stopBtn.title = autoOn ? "自动控制运行中，请先停止自动" : "";
      stopBtn.addEventListener("click", () =>
        apiFetch(`/api/control/equipment/${eq.id}/stop`, { method: "POST" }).catch(() => {})
      );
      actions.append(startBtn, stopBtn);
    }

    dom.opsEquipmentArea.appendChild(card);

    // Register DOM elements for WS updates, then seed from cached monitor data
    SIGNAL_ROLES.forEach((role) => {
      const point = roleMap[role];
      if (!point) return;
      const dotEl = card.querySelector(`[data-ops-dot="${point.id}"]`);
      if (dotEl) {
        state.opsPointEls.set(point.id, { dotEl });
        if (point.point_monitor) {
          const m = point.point_monitor;
          dotEl.className = sigDotClass(role, m.quality, m.value_text);
        }
      }
    });
  });
}

export function startOps() {
  renderOpsUnits();
  loadAllEquipmentCards();

  dom.batchStartAutoBtn?.addEventListener("click", () => {
    apiFetch("/api/control/unit/batch-start-auto", { method: "POST" })
      .then(() => loadUnits())
      .catch(() => {});
  });

  dom.batchStopAutoBtn?.addEventListener("click", () => {
    apiFetch("/api/control/unit/batch-stop-auto", { method: "POST" })
      .then(() => loadUnits())
      .catch(() => {});
  });
}

/** Called by WS handler when a unit's runtime changes — syncs manual button disabled state. */
export function syncEquipmentButtonsForUnit(unitId, autoEnabled) {
  if (!dom.opsEquipmentArea) return;
  dom.opsEquipmentArea
    .querySelectorAll(`.ops-eq-card-actions[data-unit-id="${unitId}"]`)
    .forEach((actions) => {
      actions.querySelectorAll("button").forEach((btn) => {
        btn.disabled = autoEnabled;
        btn.title = autoEnabled ? "自动控制运行中，请先停止自动" : "";
      });
    });
}