"use client";

import { useEffect, useState, useCallback } from "react";
import { useRouter } from "next/navigation";
import { getTickets, type Ticket } from "@/lib/api";
import { useAuth } from "@/lib/auth";
import BadgeStatus from "@/components/BadgeStatus";
import BadgePriority from "@/components/BadgePriority";
import PaginationComponent from "@/components/Pagination";
import Link from "next/link";

export default function TicketsPage() {
  const router = useRouter();
  const { user } = useAuth();
  const [tickets, setTickets] = useState<Ticket[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [loading, setLoading] = useState(true);
  const [view, setView] = useState<"all" | "mine" | "assigned" | "unassigned">("all");
  const [statusFilter, setStatusFilter] = useState("");
  const [priorityFilter, setPriorityFilter] = useState("");
  const [search, setSearch] = useState("");
  const pageSize = 10;

  const numericId = parseInt(user?.idUsuario ?? "", 10);
  const hasNumericId = !isNaN(numericId);

  const fetchTickets = useCallback(async () => {
    setLoading(true);
    try {
      const data = await getTickets({
        status: statusFilter || undefined,
        priority: priorityFilter || undefined,
        requesterId: view === "mine" && hasNumericId ? numericId : undefined,
        assigneeId:
          view === "assigned" && hasNumericId
            ? numericId
            : view === "unassigned"
              ? 0
              : undefined,
        search: search || undefined,
        page,
        pageSize,
      });
      setTickets(data.items || []);
      setTotal(data.total || 0);
    } catch {
      setTickets([]);
      setTotal(0);
    } finally {
      setLoading(false);
    }
  }, [statusFilter, priorityFilter, search, page, view, numericId, hasNumericId]);

  useEffect(() => {
    fetchTickets();
  }, [fetchTickets]);

  const totalPages = Math.ceil(total / pageSize);

  return (
    <div>
      <div className="page-header">
        <h1>Tickets</h1>
        <Link href="/tickets/new" className="btn btn-primary">
          <i className="bi bi-plus-lg me-2"></i>
          Nuevo Ticket
        </Link>
      </div>

      {/* Filters */}
      <div className="filter-bar mb-3">
        <div className="btn-group" role="group" aria-label="Vista">
          {(
            [
              ["all", "Todos"],
              ["mine", "Míos"],
              ["assigned", "Asignados a mí"],
              ["unassigned", "Sin asignar"],
            ] as const
          ).map(([v, label]) => (
            <button
              key={v}
              type="button"
              className={`btn btn-sm ${view === v ? "btn-primary" : "btn-outline-secondary"}`}
              onClick={() => {
                setView(v);
                setPage(1);
              }}
            >
              {label}
            </button>
          ))}
        </div>
      </div>
      <div className="filter-bar mb-4">
        <div className="d-flex align-items-center gap-2">
          <i className="bi bi-funnel text-muted"></i>
          <span className="fw-semibold" style={{ fontSize: "0.85rem" }}>Filtros:</span>
        </div>

        <select
          className="form-select"
          style={{ width: "auto" }}
          value={statusFilter}
          onChange={(e) => { setStatusFilter(e.target.value); setPage(1); }}
        >
          <option value="">Todos los estados</option>
          <option value="Open">Abierto</option>
          <option value="Pending">Pendiente</option>
          <option value="InProgress">En Progreso</option>
          <option value="Resolved">Resuelto</option>
          <option value="Closed">Cerrado</option>
        </select>

        <select
          className="form-select"
          style={{ width: "auto" }}
          value={priorityFilter}
          onChange={(e) => { setPriorityFilter(e.target.value); setPage(1); }}
        >
          <option value="">Todas las prioridades</option>
          <option value="Low">Baja</option>
          <option value="Medium">Media</option>
          <option value="High">Alta</option>
          <option value="Critical">Crítica</option>
        </select>

        <div className="position-relative flex-grow-1" style={{ maxWidth: "280px" }}>
          <i className="bi bi-search position-absolute" style={{ left: "10px", top: "50%", transform: "translateY(-50%)", color: "#6c757d" }}></i>
          <input
            type="text"
            className="form-control"
            style={{ paddingLeft: "2rem" }}
            placeholder="Buscar tickets..."
            value={search}
            onChange={(e) => { setSearch(e.target.value); setPage(1); }}
          />
        </div>
      </div>

      {/* Tickets Table */}
      <div className="table-responsive">
        <table className="table table-modern mb-0">
          <thead>
            <tr>
              <th>#</th>
              <th>Asunto</th>
              <th>Solicitante</th>
              <th>Estado</th>
              <th>Prioridad</th>
              <th>Asignado</th>
              <th>Actualizado</th>
            </tr>
          </thead>
          <tbody>
            {loading ? (
              <tr>
                <td colSpan={7} className="text-center py-4">
                  <div className="spinner-border spinner-border-sm text-primary" role="status"></div>
                </td>
              </tr>
            ) : tickets.length === 0 ? (
              <tr>
                <td colSpan={7} className="empty-state">
                  <i className="bi bi-inbox d-block"></i>
                  <h5>No se encontraron tickets</h5>
                  <p className="text-muted mb-0">Prueba ajustando los filtros de búsqueda</p>
                </td>
              </tr>
            ) : (
              tickets.map((ticket) => (
                <tr
                  key={ticket.id}
                  onClick={() => router.push(`/tickets/${ticket.id}`)}
                  style={{ cursor: "pointer" }}
                >
                  <td className="fw-semibold" style={{ color: "var(--primary)" }}>
                    {ticket.ticketNumber || `#${ticket.id}`}
                  </td>
                  <td>
                    <div className="fw-medium">{ticket.title}</div>
                  </td>
                  <td>{ticket.requesterName || "N/A"}</td>
                  <td><BadgeStatus status={ticket.status} /></td>
                  <td><BadgePriority priority={ticket.priority} /></td>
                  <td>{ticket.assigneeName || <span className="text-muted">Sin asignar</span>}</td>
                  <td className="text-muted" style={{ fontSize: "0.85rem" }}>
                    {new Date(ticket.updatedAt).toLocaleDateString("es-CL")}
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>

      {/* Pagination */}
      <div className="pagination-wrapper">
        <span className="pagination-info">
          Mostrando {tickets.length} de {total} tickets
        </span>
        <PaginationComponent currentPage={page} totalPages={totalPages} onPageChange={setPage} />
      </div>
    </div>
  );
}