import { Show, createSignal, createMemo } from "solid-js";
import { Input } from "../../components/ui/input";
import { Select } from "../../components/ui/select";
import { Textarea } from "../../components/ui/textarea";
import { getInitials } from "../../components/dashboard/types";
import { CalendarDaysIcon, PlusIcon, XIcon, EyeIcon } from "../../components/dashboard/icons";
import { apiClient } from "../../lib/api-client";
import { DashboardLayout, useDashboardData } from "./layout";

function BookingsPage() {
  const data = useDashboardData();
  const [filterStatus, setFilterStatus] = createSignal<"all" | "confirmed" | "pending" | "cancelled" | "completed">("all");
  const [filterDateRange, setFilterDateRange] = createSignal<"all" | "today" | "week" | "month">("all");
  const [searchQuery, setSearchQuery] = createSignal("");
  const [showNewBooking, setShowNewBooking] = createSignal(false);
  const [creatingBooking, setCreatingBooking] = createSignal(false);
  const [pinnedBookingIds, setPinnedBookingIds] = createSignal<Set<string>>(new Set());

  const [newBookingCustomer, setNewBookingCustomer] = createSignal("");
  const [newBookingEmail, setNewBookingEmail] = createSignal("");
  const [newBookingService, setNewBookingService] = createSignal("");
  const [newBookingDate, setNewBookingDate] = createSignal("");
  const [newBookingTime, setNewBookingTime] = createSignal("");
  const [newBookingNotes, setNewBookingNotes] = createSignal("");

  const resolvedAllBookings = () => data.resolvedSummary()?.allBookings ?? data.normalizedAllBookings() ?? [];

  const filteredBookings = createMemo(() => {
    let bookings = resolvedAllBookings();
    if (filterStatus() !== "all") bookings = bookings.filter((b: any) => b.status === filterStatus());
    const now = new Date();
    if (filterDateRange() === "today") bookings = bookings.filter((b: any) => new Date(b.startsAt).toDateString() === now.toDateString());
    else if (filterDateRange() === "week") {
      const weekEnd = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000);
      bookings = bookings.filter((b: any) => { const d = new Date(b.startsAt); return d >= now && d <= weekEnd; });
    } else if (filterDateRange() === "month") {
      const monthEnd = new Date(now.getTime() + 30 * 24 * 60 * 60 * 1000);
      bookings = bookings.filter((b: any) => { const d = new Date(b.startsAt); return d >= now && d <= monthEnd; });
    }
    if (searchQuery().trim()) {
      const q = searchQuery().toLowerCase();
      bookings = bookings.filter((b: any) =>
        b.customerName?.toLowerCase().includes(q) ||
        b.service?.toLowerCase().includes(q) ||
        b.reference?.toLowerCase().includes(q)
      );
    }
    return bookings.sort((a: any, b: any) => {
      const aPinned = pinnedBookingIds().has(a.id) ? 1 : 0;
      const bPinned = pinnedBookingIds().has(b.id) ? 1 : 0;
      if (aPinned !== bPinned) return bPinned - aPinned;
      return new Date(b.startsAt).getTime() - new Date(a.startsAt).getTime();
    });
  });

  const bookingStats = createMemo(() => {
    const bookings = resolvedAllBookings();
    return {
      total: bookings.length,
      confirmed: bookings.filter((b: any) => b.status === "confirmed").length,
      pending: bookings.filter((b: any) => b.status === "pending").length,
      cancelled: bookings.filter((b: any) => b.status === "cancelled").length,
      completed: bookings.filter((b: any) => b.status === "completed").length,
    };
  });

  const handleCreateBooking = async () => {
    const bearer = data.token();
    if (!bearer || bearer.startsWith("demo.")) {
      data.setDemoNotice(data.i18n.locale() === "cs" ? "V demo rezimu nelze vytvaret rezervace." : "Cannot create bookings in demo mode.");
      setShowNewBooking(false); return;
    }
    setCreatingBooking(true);
    try {
      await (apiClient as any).POST("/v1/catalog/bookings", {
        headers: { Authorization: `Bearer ${bearer}` },
        body: {
          customerName: newBookingCustomer(), customerEmail: newBookingEmail(), service: newBookingService(),
          startsAt: new Date(`${newBookingDate()}T${newBookingTime()}`).toISOString(), notes: newBookingNotes()
        }
      });
      setNewBookingCustomer(""); setNewBookingEmail(""); setNewBookingService(""); setNewBookingDate(""); setNewBookingTime(""); setNewBookingNotes("");
      setShowNewBooking(false);
    } catch { data.setDemoNotice(data.i18n.locale() === "cs" ? "Vytvoreni rezervace selhalo." : "Failed to create booking."); }
    finally { setCreatingBooking(false); }
  };

  const statusLabels: Record<string, string> = {
    confirmed: data.i18n.t("dashboard.confirmed"), pending: data.i18n.t("dashboard.pending"),
    cancelled: data.i18n.t("dashboard.cancelled"), completed: data.i18n.t("dashboard.completed")
  };

  return (
    <div class="space-y-6">
      <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4">
        <div>
          <h1 class="text-2xl sm:text-3xl font-bold text-ink font-display">{data.i18n.t("dashboard.bookingManagement")}</h1>
          <p class="text-ink-muted mt-1">{bookingStats().total} {data.i18n.t("dashboard.totalBookings")}</p>
        </div>
        <button onClick={() => setShowNewBooking(true)} class="btn-primary text-sm shrink-0">
          <PlusIcon /> {data.i18n.t("dashboard.newBooking")}
        </button>
      </div>

      {/* Stats */}
      <div class="grid grid-cols-2 sm:grid-cols-4 gap-4">
        {[
          { key: "confirmed", label: data.i18n.t("dashboard.confirmed"), value: bookingStats().confirmed },
          { key: "pending", label: data.i18n.t("dashboard.pending"), value: bookingStats().pending },
          { key: "cancelled", label: data.i18n.t("dashboard.cancelled"), value: bookingStats().cancelled },
          { key: "completed", label: data.i18n.t("dashboard.completed"), value: bookingStats().completed },
        ].map((s) => (
          <button onClick={() => setFilterStatus(s.key as any)} class={`surface-card p-4 text-left transition-all hover:shadow-md ${filterStatus() === s.key ? "ring-2 ring-accent" : ""}`}>
            <p class="text-xs text-ink-muted uppercase tracking-wider">{s.label}</p>
            <p class="text-2xl font-bold text-ink mt-1 font-display">{s.value}</p>
          </button>
        ))}
      </div>

      {/* Filters */}
      <div class="flex flex-col sm:flex-row gap-3">
        <div class="flex-1">
          <Input type="text" placeholder={data.i18n.t("dashboard.search.bookings")} value={searchQuery()} onInput={(e) => setSearchQuery(e.currentTarget.value)} />
        </div>
        <div class="flex gap-2">
          <Select value={filterStatus()} onChange={(v) => setFilterStatus(v as any)} options={[
            { value: "all", label: data.i18n.t("dashboard.filter.all") },
            { value: "confirmed", label: data.i18n.t("dashboard.confirmed") },
            { value: "pending", label: data.i18n.t("dashboard.pending") },
            { value: "cancelled", label: data.i18n.t("dashboard.cancelled") },
            { value: "completed", label: data.i18n.t("dashboard.completed") },
          ]} />
          <Select value={filterDateRange()} onChange={(v) => setFilterDateRange(v as any)} options={[
            { value: "all", label: data.i18n.t("dashboard.filter.all") },
            { value: "today", label: data.i18n.t("dashboard.filter.today") },
            { value: "week", label: data.i18n.t("dashboard.filter.week") },
            { value: "month", label: data.i18n.t("dashboard.filter.month") },
          ]} />
        </div>
      </div>

      {/* Bookings List */}
      <div class="surface-card overflow-hidden">
        <Show when={filteredBookings().length > 0} fallback={
          <div class="p-12 text-center">
            <div class="w-16 h-16 rounded-full bg-canvas-subtle flex items-center justify-center mx-auto mb-4">
              <CalendarDaysIcon />
            </div>
            <p class="text-ink-muted font-medium">{data.i18n.t("dashboard.empty.title")}</p>
            <p class="text-sm text-ink-subtle mt-1">{data.i18n.t("dashboard.empty.bookingsDesc")}</p>
          </div>
        }>
          <div class="divide-y divide-border/60">
            {filteredBookings().map((booking: any) => {
              const isPinned = () => pinnedBookingIds().has(booking.id);
              const togglePin = (e: Event) => {
                e.stopPropagation();
                setPinnedBookingIds((prev) => {
                  const next = new Set(prev);
                  if (next.has(booking.id)) next.delete(booking.id);
                  else next.add(booking.id);
                  return next;
                });
              };
              return (
                <div class={`flex items-center gap-4 p-4 hover:bg-canvas-subtle/30 transition-colors group ${isPinned() ? "bg-accent-soft/40" : ""}`}>
                  <div class={`w-10 h-10 rounded-full flex items-center justify-center text-sm font-bold shrink-0 ${
                    booking.status === "confirmed" ? "bg-accent text-canvas" : "bg-canvas-muted text-ink-muted"
                  }`}>
                    {getInitials(booking.customerName)}
                  </div>
                  <div class="flex-1 min-w-0">
                    <div class="flex items-center gap-2">
                      <p class="font-medium text-ink">{booking.customerName}</p>
                      {isPinned() && <span class="w-1.5 h-1.5 rounded-full bg-accent" />}
                    </div>
                    <p class="text-sm text-ink-muted">{booking.service} &bull; {new Date(booking.startsAt).toLocaleDateString()} {new Date(booking.startsAt).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" })}</p>
                  </div>
                  <div class="flex items-center gap-2 shrink-0">
                    <button
                      type="button"
                      onClick={togglePin}
                      class={`flex h-6 w-6 items-center justify-center rounded-full transition-all duration-200 ${
                        isPinned()
                          ? "bg-accent text-canvas hover:bg-accent-hover"
                          : "bg-canvas-subtle border border-border text-ink-subtle hover:border-accent/40 hover:text-accent"
                      }`}
                      aria-label={isPinned() ? "Unpin" : "Pin"}
                    >
                      <svg width="10" height="10" viewBox="0 0 10 10" fill="currentColor">
                        <circle cx="5" cy="5" r="4" class={isPinned() ? "" : "opacity-0"} />
                        <circle cx="5" cy="5" r="3.5" fill="none" stroke="currentColor" stroke-width="1" class={isPinned() ? "opacity-0" : ""} />
                      </svg>
                    </button>
                    <span class={`inline-flex items-center px-2.5 py-1 rounded-full text-xs font-medium ${
                      booking.status === "confirmed" ? "bg-accent/10 text-accent"
                      : booking.status === "pending" ? "bg-canvas-muted text-ink-muted"
                      : "bg-canvas-subtle text-ink-subtle"
                    }`}>
                      {statusLabels[booking.status]}
                    </span>
                    <button onClick={() => data.openBookingDetail(booking)} class="p-2 text-ink-muted hover:text-accent hover:bg-accent-subtle rounded-lg transition-colors" title={data.i18n.t("dashboard.details")}>
                      <EyeIcon />
                    </button>
                  </div>
                </div>
              );
            })}
          </div>
        </Show>
      </div>

      {/* New Booking Modal */}
      <Show when={showNewBooking()}>
        <div class="fixed inset-0 z-50 flex items-center justify-center p-4">
          <div class="absolute inset-0 bg-ink/50 backdrop-blur-sm" onClick={() => setShowNewBooking(false)} />
          <div class="relative bg-canvas rounded-2xl shadow-2xl w-full max-w-lg animate-scale-in">
            <div class="p-6 border-b border-border flex items-center justify-between">
              <h3 class="text-xl font-bold text-ink">{data.i18n.t("dashboard.newBooking")}</h3>
              <button onClick={() => setShowNewBooking(false)} class="p-2 hover:bg-canvas-subtle rounded-lg transition-colors"><XIcon /></button>
            </div>
            <div class="p-6 space-y-4">
              <Input type="text" label={data.i18n.t("booking.customer.name")} value={newBookingCustomer()} onInput={(e) => setNewBookingCustomer(e.currentTarget.value)} />
              <Input type="email" label={data.i18n.t("booking.customer.email")} value={newBookingEmail()} onInput={(e) => setNewBookingEmail(e.currentTarget.value)} />
              <Input type="text" label={data.i18n.t("dashboard.bookingModal.service")} value={newBookingService()} onInput={(e) => setNewBookingService(e.currentTarget.value)} />
              <div class="grid grid-cols-2 gap-4">
                <Input type="date" label={data.i18n.t("dashboard.bookingModal.dateTime")} value={newBookingDate()} onInput={(e) => setNewBookingDate(e.currentTarget.value)} />
                <Input type="time" label={data.i18n.t("dashboard.bookingModal.duration")} value={newBookingTime()} onInput={(e) => setNewBookingTime(e.currentTarget.value)} />
              </div>
              <Textarea label={data.i18n.t("booking.customer.notes")} value={newBookingNotes()} onInput={(e) => setNewBookingNotes(e.currentTarget.value)} rows={3} resize="none" />
            </div>
            <div class="p-6 border-t border-border flex gap-3">
              <button onClick={() => setShowNewBooking(false)} class="flex-1 px-4 py-2.5 border border-border rounded-xl text-ink hover:bg-canvas-subtle transition-colors">{data.i18n.t("common.cancel")}</button>
              <button onClick={handleCreateBooking} disabled={creatingBooking() || !newBookingCustomer() || !newBookingEmail() || !newBookingDate() || !newBookingTime()} class="flex-1 px-4 py-2.5 bg-accent text-canvas rounded-xl hover:bg-accent-hover transition-colors disabled:opacity-50 flex items-center justify-center gap-2">
                <Show when={creatingBooking()}><span class="inline-block w-4 h-4 border-2 border-canvas/30 border-t-canvas rounded-full animate-spin" /></Show>
                {creatingBooking() ? data.i18n.t("dashboard.creating") : data.i18n.t("dashboard.createBooking")}
              </button>
            </div>
          </div>
        </div>
      </Show>
    </div>
  );
}

export default function BookingsRoute() {
  return (
    <DashboardLayout>
      <BookingsPage />
    </DashboardLayout>
  );
}