const state = {
  data: null,
  selectedRequestId: "",
  selectedSlotId: "",
  selectedPrice: 0,
  activeScenario: "normal",
  activeSlotFilter: "morning",
  mobilePanel: "phone",
  variationIndex: 0,
};

const els = {
  shell: document.querySelector(".app-shell"),
  todayLabel: document.querySelector("#todayLabel"),
  channelStatus: document.querySelector("#channelStatus"),
  channelCopy: document.querySelector("#channelCopy"),
  pendingCount: document.querySelector("#pendingCount"),
  scenarioButtons: document.querySelector("#scenarioButtons"),
  requestQueue: document.querySelector("#requestQueue"),
  chatPhone: document.querySelector("#chatPhone"),
  chatThread: document.querySelector("#chatThread"),
  detectedIntent: document.querySelector("#detectedIntent"),
  confidenceValue: document.querySelector("#confidenceValue"),
  extractedSlots: document.querySelector("#extractedSlots"),
  missingList: document.querySelector("#missingList"),
  traceList: document.querySelector("#traceList"),
  timelineState: document.querySelector("#timelineState"),
  bookingId: document.querySelector("#bookingId"),
  availabilityBoard: document.querySelector("#availabilityBoard"),
  packetList: document.querySelector("#packetList"),
  groupA: document.querySelector("#groupA"),
  groupB: document.querySelector("#groupB"),
  suggestedPrice: document.querySelector("#suggestedPrice"),
  integrationsList: document.querySelector("#integrationsList"),
  replyDraft: document.querySelector("#replyDraft"),
  charCount: document.querySelector("#charCount"),
  decisionState: document.querySelector("#decisionState"),
  approveButton: document.querySelector("#approveButton"),
  clarifyButton: document.querySelector("#clarifyButton"),
  rejectButton: document.querySelector("#rejectButton"),
  resetDemoButton: document.querySelector("#resetDemoButton"),
  suggestButton: document.querySelector("#suggestButton"),
};

function formatPrice(value) {
  return new Intl.NumberFormat("en-IN", {
    style: "currency",
    currency: "INR",
    maximumFractionDigits: 0,
  }).format(value);
}

function slotKey(venueId, slotId) {
  return `${venueId}:${slotId}`;
}

function getSelectedRequest() {
  return state.data?.requests.find((request) => request.id === state.selectedRequestId) || null;
}

function getSelectedSlot() {
  if (!state.data || !state.selectedSlotId) return null;
  const [venueId, slotId] = state.selectedSlotId.split(":");
  const venue = state.data.venues.find((item) => item.id === venueId);
  const slot = state.data.slots.find((item) => item.id === slotId);
  const inventory = venue?.slots?.[slotId];
  if (!venue || !slot || !inventory) return null;
  return { venue, slot, inventory };
}

async function loadScenario(scenario = "normal") {
  const response = await fetch(`/api/bootstrap?scenario=${encodeURIComponent(scenario)}`);
  state.data = await response.json();
  state.activeScenario = state.data.active_scenario;
  state.selectedRequestId = state.data.decision.selected_request_id;
  state.selectedSlotId = state.data.decision.selected_slot_id;
  state.selectedPrice = state.data.decision.selected_price;
  state.activeSlotFilter = state.selectedSlotId.split(":")[1] || "morning";
  state.variationIndex = 0;
  render();
}

function render() {
  renderRuntime();
  renderScenarios();
  renderRequestSelect();
  renderPhone();
  renderAgentPanel();
  renderOwnerPanel();
  renderDecisionBar();
  renderMobilePanel();
}

function renderRuntime() {
  const runtime = state.data.runtime;
  els.todayLabel.textContent = getSelectedRequest()?.date_label || "25 May 2025, Sun";
  els.channelStatus.textContent = runtime.channel_label;
  els.channelCopy.textContent = runtime.channel_copy;
  els.pendingCount.textContent = `${runtime.pending_count} pending`;
  els.shell.classList.toggle("is-provider-error", runtime.channel_status === "provider-error");
}

function renderScenarios() {
  els.scenarioButtons.replaceChildren(
    ...state.data.scenarios.map((scenario) => {
      const button = document.createElement("button");
      button.type = "button";
      button.textContent = scenario.label;
      button.className = scenario.id === state.activeScenario ? "is-active" : "";
      button.addEventListener("click", () => loadScenario(scenario.id));
      return button;
    })
  );
}

function renderRequestSelect() {
  if (!state.data.requests.length) {
    const option = new Option("No booking requests", "");
    els.requestQueue.replaceChildren(option);
    els.requestQueue.disabled = true;
    return;
  }

  els.requestQueue.disabled = false;
  els.requestQueue.replaceChildren(
    ...state.data.requests.map((request) => {
      const label = `${request.customer_name} · ${request.activity} · ${stateLabel(request.status)}`;
      const option = new Option(label, request.id, false, request.id === state.selectedRequestId);
      return option;
    })
  );
}

function renderPhone() {
  const request = getSelectedRequest();
  els.chatPhone.textContent = request?.phone || "No active conversation";
  if (!request) {
    els.chatThread.replaceChildren(emptyPanel("No active booking chat. Pick a scenario or wait for a new request."));
    return;
  }

  const selected = getSelectedSlot();
  const locationText = selected?.venue.name || "North Field or South Field";
  const transcript = [
    { who: "customer", text: `Hi, need a ground for ${request.activity.toLowerCase()} ${request.date_label.toLowerCase()}.`, time: "11:34 AM" },
    { who: "agent", text: "Hi! Sure, what time are you looking for?", time: "11:35 AM" },
    { who: "customer", text: `${selected?.slot.label || "8 AM - 12 PM"}. For ${request.players} players.`, time: "11:35 AM" },
    { who: "agent", text: "Which location?", time: "11:36 AM" },
    { who: "customer", text: `${locationText} works.`, time: "11:36 AM" },
    { who: "agent", text: "Any surface preference?", time: "11:37 AM" },
    { who: "customer", text: `${selected?.venue.surface || "Grass"} is fine. Budget around ${formatPrice(state.selectedPrice || selected?.inventory.rate || 6000)}.`, time: "11:38 AM" },
    { who: "agent", text: "Got it. Let me check availability and send options.", time: "11:38 AM" },
  ];

  const day = document.createElement("div");
  day.className = "chat-day";
  day.textContent = "Today";
  els.chatThread.replaceChildren(day, ...transcript.map(chatBubble));
}

function chatBubble(message) {
  const div = document.createElement("div");
  div.className = `bubble ${message.who === "agent" ? "agent" : ""}`;
  div.innerHTML = `${message.text}<time>${message.time}</time>`;
  return div;
}

function renderAgentPanel() {
  const request = getSelectedRequest();
  const selected = getSelectedSlot();
  const confidence = confidenceFor(request);
  els.detectedIntent.textContent = request ? "BOOK_SLOT" : "IDLE";
  els.confidenceValue.textContent = confidence.toFixed(2);
  document.querySelector(".confidence-meter span").style.width = `${Math.round(confidence * 100)}%`;

  if (!request) {
    els.extractedSlots.replaceChildren();
    els.missingList.replaceChildren(emptyListItem("Waiting for the next booking request."));
    els.traceList.replaceChildren(...state.data.trace.map(traceItem));
    els.timelineState.textContent = "Idle";
    return;
  }

  const extracted = [
    ["date", request.date_label],
    ["time", selected?.slot.label || "Not selected"],
    ["players", String(request.players)],
    ["activity", request.activity],
    ["location", selected?.venue.name || "Any venue"],
    ["surface", selected ? `${selected.venue.surface} · ${selected.venue.grass_type}` : "Grass"],
    ["budget", `${formatPrice(state.selectedPrice || selected?.inventory.rate || 0)} approx`],
  ];

  els.extractedSlots.replaceChildren(...extracted.flatMap(([label, value]) => slotRow(label, value)));
  const missing = request.missing_fields.length
    ? request.missing_fields
    : ["Backup slot preference", "Add-ons final confirmation"];
  els.missingList.replaceChildren(...missing.map((item) => listItem(item)));
  els.traceList.replaceChildren(...buildTimeline(request).map(traceItem));
  els.timelineState.textContent = state.data.decision.state === "sent" ? "Sent" : timelineCopy(request);
}

function renderOwnerPanel() {
  const request = getSelectedRequest();
  els.bookingId.textContent = request ? `Booking ID: BK-${request.id.slice(0, 2).toUpperCase()}51872` : "Booking ID: none";
  renderAvailabilityBoard();
  renderPacket();
  renderGroups(request);
  renderIntegrations();
}

function renderAvailabilityBoard() {
  const slot = state.data.slots.find((item) => item.id === state.activeSlotFilter) || state.data.slots[0];
  document.querySelectorAll("[data-slot-filter]").forEach((button) => {
    button.classList.toggle("is-active", button.dataset.slotFilter === slot.id);
  });

  const rows = state.data.venues.map((venue) => {
    const inventory = venue.slots[slot.id];
    const key = slotKey(venue.id, slot.id);
    const button = document.createElement("button");
    button.type = "button";
    button.className = `venue-row ${key === state.selectedSlotId ? "is-selected" : ""}`;
    button.innerHTML = `
      <span>
        <strong>${venue.name}</strong>
        <small>${venue.surface} · ${venue.grass_type}</small>
      </span>
      <span class="venue-rate">${formatPrice(inventory.rate)}</span>
      <span class="surface-badge">${venue.grass_type}</span>
      <span class="slot-count ${inventory.status}">${inventoryLabel(inventory)}</span>
    `;
    button.addEventListener("click", () => {
      state.selectedSlotId = key;
      state.selectedPrice = inventory.rate;
      render();
    });
    return button;
  });
  els.availabilityBoard.replaceChildren(...rows);
}

function renderPacket() {
  const selected = getSelectedSlot();
  const packet = [
    ["Umpire", "₹700"],
    ["Scorekeeper", "₹300"],
    ["Match ball", "₹250"],
    ["Water", "₹200"],
  ];
  els.packetList.replaceChildren(
    ...packet.map(([label, price]) => {
      const item = document.createElement("div");
      item.className = "packet-item";
      item.innerHTML = `<strong>${label}</strong><span>${price}</span>`;
      return item;
    })
  );
  const base = selected?.inventory.rate || 0;
  els.suggestedPrice.textContent = `Slot ${formatPrice(base)} · Total add-ons: ${formatPrice(1450)}`;
}

function renderGroups(request) {
  const groupA = request
    ? [
        ["Group name", request.group_type],
        ["Primary contact", request.phone],
        ["Activity", request.activity],
        ["Players", String(request.players)],
      ]
    : [["State", "No request selected"]];
  const groupB = request
    ? [
        ["Group name", "To be confirmed"],
        ["Status", request.missing_fields.length ? "Needs clarification" : "Ready"],
        ["Venue", getSelectedSlot()?.venue.name || "Not selected"],
        ["Slot", getSelectedSlot()?.slot.label || "Not selected"],
      ]
    : [["State", "No request selected"]];
  els.groupA.replaceChildren(...definitionRows(groupA));
  els.groupB.replaceChildren(...definitionRows(groupB));
}

function renderIntegrations() {
  els.integrationsList.replaceChildren(
    ...state.data.integrations.map((integration) => {
      const row = document.createElement("div");
      row.className = "integration-row";
      row.innerHTML = `<span>${integration.label}</span><span>${integration.copy}</span>`;
      return row;
    })
  );
}

function renderDecisionBar() {
  const request = getSelectedRequest();
  const providerError = state.data.runtime.channel_status === "provider-error";
  if (document.activeElement !== els.replyDraft) {
    els.replyDraft.value = request?.reply_draft || "Pick a request to review the reply draft.";
  }
  updateCharCount();
  els.decisionState.textContent = decisionCopy(state.data.decision.state, request);

  const disabled = !request || providerError;
  els.approveButton.disabled = disabled;
  els.clarifyButton.disabled = !request;
  els.rejectButton.disabled = !request;
}

function slotRow(label, value) {
  const dt = document.createElement("dt");
  const dd = document.createElement("dd");
  const ok = document.createElement("span");
  dt.textContent = label;
  dd.textContent = value;
  ok.className = "ok-mark";
  ok.textContent = "✓";
  return [dt, dd, ok];
}

function definitionRows(rows) {
  return rows.flatMap(([label, value]) => {
    const dt = document.createElement("dt");
    const dd = document.createElement("dd");
    dt.textContent = label;
    dd.textContent = value;
    return [dt, dd];
  });
}

function listItem(text) {
  const li = document.createElement("li");
  li.textContent = text;
  return li;
}

function emptyListItem(text) {
  return listItem(text);
}

function emptyPanel(text) {
  const div = document.createElement("div");
  div.className = "empty-state";
  div.textContent = text;
  return div;
}

function traceItem(event) {
  const li = document.createElement("li");
  li.className = event.tone;
  li.innerHTML = `<time>${event.timestamp_label || "now"}</time><span>${event.label}</span>`;
  return li;
}

function buildTimeline(request) {
  const selected = getSelectedSlot();
  return [
    { id: "hello", label: `Message received from ${request.customer_name}`, tone: "neutral", timestamp_label: "11:34:12" },
    { id: "time", label: `Extracted ${selected?.slot.label || "requested slot"}`, tone: "success", timestamp_label: "11:35:04" },
    { id: "players", label: `User: ${request.players} players`, tone: "success", timestamp_label: "11:35:16" },
    { id: "venue", label: `Venue candidate: ${selected?.venue.name || "Any venue"}`, tone: "success", timestamp_label: "11:36:02" },
    ...state.data.trace,
  ];
}

function confidenceFor(request) {
  if (!request) return 0;
  if (state.data.runtime.channel_status === "provider-error") return 0.64;
  if (request.status === "clarification") return 0.78;
  if (request.status === "conflict") return 0.86;
  return 0.92;
}

function timelineCopy(request) {
  if (!request) return "Idle";
  if (request.status === "conflict") return "Alternatives Needed";
  if (request.missing_fields.length) return "Clarify First";
  return "Ready for Reply";
}

function stateLabel(status) {
  const labels = {
    new: "New",
    clarification: "Clarify",
    conflict: "Conflict",
    sent: "Sent",
    rejected: "Rejected",
  };
  return labels[status] || status;
}

function inventoryLabel(inventory) {
  if (inventory.status === "partial") return `${inventory.request_count} holds`;
  if (inventory.status === "conflict") return "Conflict";
  if (inventory.status === "booked") return "Booked";
  return "Available";
}

function decisionCopy(decisionState, request) {
  if (!request) return "Idle. No outbound reply can be sent.";
  if (decisionState === "sent") return "Sent via simulator. No live WhatsApp proof claimed.";
  if (decisionState === "rejected") return "Rejected by owner.";
  if (decisionState === "error") return "Provider error. Retry before sending.";
  if (request.missing_fields.length) return "Clarification needed before confirmation.";
  if (request.status === "conflict") return "Conflict detected. Offer alternatives.";
  return "Pending owner approval.";
}

function renderMobilePanel() {
  document.querySelectorAll("[data-panel]").forEach((panel) => {
    panel.classList.toggle("is-mobile-active", panel.dataset.panel === state.mobilePanel);
  });
  document.querySelectorAll("[data-mobile-panel-target]").forEach((tab) => {
    tab.classList.toggle("is-active", tab.dataset.mobilePanelTarget === state.mobilePanel);
  });
}

function updateCharCount() {
  els.charCount.textContent = `Characters: ${els.replyDraft.value.length}`;
}

function attachEvents() {
  document.querySelectorAll("[data-mobile-panel-target]").forEach((tab) => {
    tab.addEventListener("click", () => {
      state.mobilePanel = tab.dataset.mobilePanelTarget;
      renderMobilePanel();
    });
  });

  document.querySelectorAll("[data-slot-filter]").forEach((button) => {
    button.addEventListener("click", () => {
      state.activeSlotFilter = button.dataset.slotFilter;
      renderAvailabilityBoard();
    });
  });

  els.requestQueue.addEventListener("change", () => {
    state.selectedRequestId = els.requestQueue.value;
    const request = getSelectedRequest();
    if (request) {
      state.selectedSlotId = request.requested_slot_id;
      state.activeSlotFilter = state.selectedSlotId.split(":")[1] || "morning";
      const selected = getSelectedSlot();
      state.selectedPrice = selected?.inventory.rate || 0;
    }
    render();
  });

  els.replyDraft.addEventListener("input", updateCharCount);

  els.suggestButton.addEventListener("click", () => {
    const request = getSelectedRequest();
    const selected = getSelectedSlot();
    if (!request || !selected) return;
    const variants = [
      `Great, ${selected.venue.name} is available for ${request.activity.toLowerCase()} on ${request.date_label} from ${selected.slot.label}. The slot is ${formatPrice(state.selectedPrice)}. Should I hold it after owner approval?`,
      `I can offer ${selected.venue.name}, ${selected.slot.label}, ${selected.venue.grass_type} surface at ${formatPrice(state.selectedPrice)}. Please confirm and we will proceed after owner approval.`,
      `Available option: ${selected.venue.name} on ${request.date_label}, ${selected.slot.label}, for ${request.players} players. Estimated slot cost is ${formatPrice(state.selectedPrice)} plus selected add-ons.`,
    ];
    state.variationIndex = (state.variationIndex + 1) % variants.length;
    els.replyDraft.value = variants[state.variationIndex];
    updateCharCount();
  });

  els.approveButton.addEventListener("click", () => {
    if (!state.data || state.data.runtime.channel_status === "provider-error") return;
    const request = getSelectedRequest();
    if (!request) return;
    state.data.decision.state = "sending";
    state.data.trace.push({ id: "sending", label: "Owner approved; simulator send in progress", tone: "neutral", timestamp_label: "now" });
    renderDecisionBar();
    renderAgentPanel();
    setTimeout(() => {
      state.data.decision.state = "sent";
      request.status = "sent";
      request.tone = "ready";
      request.reply_draft = els.replyDraft.value;
      state.data.trace.push({ id: "sent", label: "Reply marked sent via simulator", tone: "success", timestamp_label: "now" });
      render();
    }, 650);
  });

  els.clarifyButton.addEventListener("click", () => {
    const request = getSelectedRequest();
    if (!request) return;
    request.status = "clarification";
    request.tone = "clarification";
    request.reply_draft = els.replyDraft.value || `Hi ${request.customer_name.split(" ")[0]}, could you confirm the missing details before I ask the owner to hold this slot?`;
    state.data.trace.push({ id: "edited-send", label: "Edited reply prepared for simulator send", tone: "warning", timestamp_label: "now" });
    render();
  });

  els.rejectButton.addEventListener("click", () => {
    const request = getSelectedRequest();
    if (!request) return;
    request.status = "rejected";
    request.tone = "rejected";
    state.data.decision.state = "rejected";
    state.data.trace.push({ id: "rejected", label: "Owner rejected the outbound reply", tone: "error", timestamp_label: "now" });
    render();
  });

  els.resetDemoButton.addEventListener("click", () => loadScenario("normal"));
}

attachEvents();
loadScenario("normal");