"use client";

import { useState, useEffect, useCallback, useMemo } from "react";
import { useParams, useRouter } from "next/navigation";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { TournamentForm } from "@/components/tournaments/tournament-form";
import { BracketView } from "@/components/tournaments/bracket-view";
import { InscriptionsList } from "@/components/tournaments/inscriptions-list";
import { MatchScoreDialog } from "@/components/tournaments/match-score-dialog";
import { cn, formatCurrency, formatDate } from "@/lib/utils";

interface Client {
  id: string;
  firstName: string;
  lastName: string;
  email: string | null;
  phone: string | null;
  level: string | null;
}

interface Inscription {
  id: string;
  clientId: string;
  partnerId: string | null;
  teamName: string | null;
  seedNumber: number | null;
  isPaid: boolean;
  paidAmount: number;
  registeredAt: string;
  client: Client;
  partner?: Client | null;
}

interface Match {
  id: string;
  round: number;
  position: number;
  status: string;
  team1Players: string[];
  team2Players: string[];
  team1Score: number[] | null;
  team2Score: number[] | null;
  winnerId: string | null;
  scheduledAt: string | null;
  court: {
    id: string;
    name: string;
  } | null;
}

interface Tournament {
  id: string;
  name: string;
  description: string | null;
  type: string;
  status: string;
  startDate: string;
  endDate: string | null;
  maxPlayers: number | null;
  entryFee: string | number;
  rules: string | null;
  isPublic: boolean;
  settings: {
    tournamentFormat?: string;
    category?: string | null;
  } | null;
  site: {
    id: string;
    name: string;
    slug: string;
    address: string | null;
    phone: string | null;
    email: string | null;
  };
  inscriptions: Inscription[];
  matches: Match[];
  _count: {
    inscriptions: number;
    matches: number;
  };
}

const tabs = [
  { id: "overview", label: "Resumen" },
  { id: "inscriptions", label: "Inscripciones" },
  { id: "bracket", label: "Bracket" },
];

const statusConfig: Record<string, { label: string; className: string }> = {
  DRAFT: {
    label: "Borrador",
    className: "bg-gray-100 text-gray-700 border-gray-300",
  },
  REGISTRATION_OPEN: {
    label: "Inscripciones Abiertas",
    className: "bg-green-100 text-green-700 border-green-300",
  },
  REGISTRATION_CLOSED: {
    label: "Inscripciones Cerradas",
    className: "bg-yellow-100 text-yellow-700 border-yellow-300",
  },
  IN_PROGRESS: {
    label: "En Progreso",
    className: "bg-blue-100 text-blue-700 border-blue-300",
  },
  COMPLETED: {
    label: "Finalizado",
    className: "bg-purple-100 text-purple-700 border-purple-300",
  },
  CANCELLED: {
    label: "Cancelado",
    className: "bg-red-100 text-red-700 border-red-300",
  },
};

const typeLabels: Record<string, string> = {
  BRACKET: "Eliminacion Directa",
  AMERICANO: "Americano",
  MEXICANO: "Mexicano",
  ROUND_ROBIN: "Round Robin",
  LEAGUE: "Liga",
};

export default function TournamentDetailPage() {
  const params = useParams();
  const router = useRouter();
  const tournamentId = params.id as string;

  const [tournament, setTournament] = useState<Tournament | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [activeTab, setActiveTab] = useState("overview");
  const [showEditForm, setShowEditForm] = useState(false);
  const [actionLoading, setActionLoading] = useState<string | null>(null);
  const [selectedMatch, setSelectedMatch] = useState<Match | null>(null);

  // Build players map for bracket view
  const playersMap = useMemo(() => {
    const map = new Map<string, Client>();
    if (tournament) {
      tournament.inscriptions.forEach((inscription) => {
        map.set(inscription.client.id, inscription.client);
        if (inscription.partner) {
          map.set(inscription.partner.id, inscription.partner);
        }
      });
    }
    return map;
  }, [tournament]);

  const fetchTournament = useCallback(async () => {
    setLoading(true);
    setError(null);
    try {
      const response = await fetch(`/api/tournaments/${tournamentId}`);
      if (!response.ok) {
        if (response.status === 404) {
          throw new Error("Torneo no encontrado");
        }
        throw new Error("Error al cargar el torneo");
      }
      const data = await response.json();
      setTournament(data);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Error desconocido");
    } finally {
      setLoading(false);
    }
  }, [tournamentId]);

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

  const handleStatusChange = async (newStatus: string) => {
    if (!tournament) return;
    setActionLoading("status");
    try {
      const response = await fetch(`/api/tournaments/${tournamentId}`, {
        method: "PUT",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ status: newStatus }),
      });

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Error al actualizar estado");
      }

      await fetchTournament();
    } catch (err) {
      alert(err instanceof Error ? err.message : "Error desconocido");
    } finally {
      setActionLoading(null);
    }
  };

  const handleGenerateBracket = async () => {
    if (!tournament) return;
    if (tournament.inscriptions.length < 2) {
      alert("Se necesitan al menos 2 equipos para generar el bracket");
      return;
    }
    if (!confirm("¿Generar el bracket? Esto iniciara el torneo y cerrara las inscripciones.")) {
      return;
    }

    setActionLoading("bracket");
    try {
      const response = await fetch(`/api/tournaments/${tournamentId}/generate-bracket`, {
        method: "POST",
      });

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Error al generar bracket");
      }

      await fetchTournament();
      setActiveTab("bracket");
    } catch (err) {
      alert(err instanceof Error ? err.message : "Error desconocido");
    } finally {
      setActionLoading(null);
    }
  };

  const handleDelete = async () => {
    if (!tournament) return;
    if (tournament.status !== "DRAFT") {
      alert("Solo se pueden eliminar torneos en estado Borrador");
      return;
    }
    if (!confirm("¿Estas seguro de eliminar este torneo? Esta accion no se puede deshacer.")) {
      return;
    }

    setActionLoading("delete");
    try {
      const response = await fetch(`/api/tournaments/${tournamentId}`, {
        method: "DELETE",
      });

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Error al eliminar torneo");
      }

      router.push("/tournaments");
    } catch (err) {
      alert(err instanceof Error ? err.message : "Error desconocido");
    } finally {
      setActionLoading(null);
    }
  };

  const handleUpdateTournament = async (data: {
    name: string;
    description: string;
    date: string;
    endDate: string;
    type: string;
    category: string;
    maxTeams: number;
    price: number;
    siteId: string;
  }) => {
    setActionLoading("edit");
    try {
      const response = await fetch(`/api/tournaments/${tournamentId}`, {
        method: "PUT",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          name: data.name,
          description: data.description,
          date: new Date(data.date).toISOString(),
          endDate: data.endDate ? new Date(data.endDate).toISOString() : null,
          type: data.type,
          category: data.category || null,
          maxTeams: data.maxTeams,
          price: data.price,
        }),
      });

      if (!response.ok) {
        const errorData = await response.json();
        throw new Error(errorData.error || "Error al actualizar torneo");
      }

      setShowEditForm(false);
      await fetchTournament();
    } catch (err) {
      throw err;
    } finally {
      setActionLoading(null);
    }
  };

  const handleRemoveInscription = async (inscriptionId: string) => {
    try {
      const response = await fetch(
        `/api/tournaments/${tournamentId}/inscriptions/${inscriptionId}`,
        { method: "DELETE" }
      );

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Error al eliminar inscripcion");
      }

      await fetchTournament();
    } catch (err) {
      alert(err instanceof Error ? err.message : "Error desconocido");
    }
  };

  const handleTogglePaid = async (inscriptionId: string, isPaid: boolean) => {
    try {
      const response = await fetch(
        `/api/tournaments/${tournamentId}/inscriptions/${inscriptionId}`,
        {
          method: "PUT",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ isPaid }),
        }
      );

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Error al actualizar pago");
      }

      await fetchTournament();
    } catch (err) {
      alert(err instanceof Error ? err.message : "Error desconocido");
    }
  };

  const handleSaveMatchScore = async (
    matchId: string,
    data: {
      score1: number[];
      score2: number[];
      winnerId: string;
      status: string;
    }
  ) => {
    const response = await fetch(
      `/api/tournaments/${tournamentId}/matches/${matchId}`,
      {
        method: "PUT",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(data),
      }
    );

    if (!response.ok) {
      const errorData = await response.json();
      throw new Error(errorData.error || "Error al guardar resultado");
    }

    setSelectedMatch(null);
    await fetchTournament();
  };

  if (loading) {
    return (
      <div className="flex items-center justify-center py-12">
        <div className="text-center">
          <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary mx-auto mb-2"></div>
          <p className="text-primary-500">Cargando torneo...</p>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="flex items-center justify-center py-12">
        <div className="text-center text-red-500">
          <p className="text-lg font-medium">{error}</p>
          <Button variant="outline" className="mt-4" onClick={() => router.push("/tournaments")}>
            Volver a Torneos
          </Button>
        </div>
      </div>
    );
  }

  if (!tournament) return null;

  const status = statusConfig[tournament.status] || statusConfig.DRAFT;
  const typeLabel = typeLabels[tournament.type] || tournament.type;
  const entryFee =
    typeof tournament.entryFee === "string"
      ? parseFloat(tournament.entryFee)
      : tournament.entryFee;
  const canEdit = ["DRAFT", "REGISTRATION_OPEN"].includes(tournament.status);
  const canGenerateBracket =
    tournament.status === "REGISTRATION_OPEN" && tournament.inscriptions.length >= 2;
  const canOpenRegistration = tournament.status === "DRAFT";
  const canDelete = tournament.status === "DRAFT";

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex flex-col lg:flex-row lg:items-start lg:justify-between gap-4">
        <div className="flex-1">
          <div className="flex items-center gap-3 mb-2">
            <Button
              variant="ghost"
              size="sm"
              onClick={() => router.push("/tournaments")}
              className="p-1"
            >
              <svg
                className="w-5 h-5"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M15 19l-7-7 7-7"
                />
              </svg>
            </Button>
            <h1 className="text-2xl font-bold text-primary-800">{tournament.name}</h1>
            <span
              className={cn(
                "px-3 py-1 text-sm font-medium rounded-full border",
                status.className
              )}
            >
              {status.label}
            </span>
          </div>
          {tournament.description && (
            <p className="text-primary-600 ml-8">{tournament.description}</p>
          )}
        </div>

        {/* Actions */}
        <div className="flex flex-wrap gap-2">
          {canEdit && (
            <Button variant="outline" onClick={() => setShowEditForm(true)}>
              <svg
                className="w-4 h-4 mr-2"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"
                />
              </svg>
              Editar
            </Button>
          )}

          {canOpenRegistration && (
            <Button
              variant="accent"
              onClick={() => handleStatusChange("REGISTRATION_OPEN")}
              disabled={actionLoading === "status"}
            >
              {actionLoading === "status" ? (
                <div className="h-4 w-4 animate-spin rounded-full border-2 border-white/30 border-t-white mr-2" />
              ) : (
                <svg
                  className="w-4 h-4 mr-2"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={2}
                    d="M12 4v16m8-8H4"
                  />
                </svg>
              )}
              Abrir Inscripciones
            </Button>
          )}

          {canGenerateBracket && (
            <Button
              onClick={handleGenerateBracket}
              disabled={actionLoading === "bracket"}
            >
              {actionLoading === "bracket" ? (
                <div className="h-4 w-4 animate-spin rounded-full border-2 border-white/30 border-t-white mr-2" />
              ) : (
                <svg
                  className="w-4 h-4 mr-2"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={2}
                    d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2"
                  />
                </svg>
              )}
              Generar Bracket
            </Button>
          )}

          {canDelete && (
            <Button
              variant="destructive"
              onClick={handleDelete}
              disabled={actionLoading === "delete"}
            >
              {actionLoading === "delete" ? (
                <div className="h-4 w-4 animate-spin rounded-full border-2 border-white/30 border-t-white mr-2" />
              ) : (
                <svg
                  className="w-4 h-4 mr-2"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={2}
                    d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
                  />
                </svg>
              )}
              Eliminar
            </Button>
          )}
        </div>
      </div>

      {/* Edit Form Modal */}
      {showEditForm && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 p-4 overflow-y-auto">
          <div className="my-8">
            <TournamentForm
              initialData={{
                name: tournament.name,
                description: tournament.description || "",
                date: tournament.startDate.slice(0, 16),
                endDate: tournament.endDate?.slice(0, 16) || "",
                type: tournament.settings?.tournamentFormat || "SINGLE_ELIMINATION",
                category: tournament.settings?.category || "",
                maxTeams: tournament.maxPlayers || 16,
                price: entryFee,
                siteId: tournament.site.id,
              }}
              onSubmit={handleUpdateTournament}
              onCancel={() => setShowEditForm(false)}
              isLoading={actionLoading === "edit"}
              mode="edit"
            />
          </div>
        </div>
      )}

      {/* Match Score Dialog */}
      {selectedMatch && (
        <MatchScoreDialog
          match={selectedMatch}
          players={playersMap}
          onSave={handleSaveMatchScore}
          onClose={() => setSelectedMatch(null)}
        />
      )}

      {/* Tabs */}
      <div className="border-b border-primary-200">
        <div className="flex gap-4">
          {tabs.map((tab) => (
            <button
              key={tab.id}
              onClick={() => setActiveTab(tab.id)}
              className={cn(
                "px-4 py-2 text-sm font-medium border-b-2 transition-colors",
                activeTab === tab.id
                  ? "border-primary text-primary"
                  : "border-transparent text-primary-500 hover:text-primary-700 hover:border-primary-300"
              )}
            >
              {tab.label}
              {tab.id === "inscriptions" && (
                <span className="ml-2 px-2 py-0.5 text-xs bg-primary-100 text-primary-700 rounded-full">
                  {tournament._count.inscriptions}
                </span>
              )}
              {tab.id === "bracket" && tournament.matches.length > 0 && (
                <span className="ml-2 px-2 py-0.5 text-xs bg-primary-100 text-primary-700 rounded-full">
                  {tournament.matches.length}
                </span>
              )}
            </button>
          ))}
        </div>
      </div>

      {/* Tab Content */}
      <div>
        {/* Overview Tab */}
        {activeTab === "overview" && (
          <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
            {/* Tournament Info */}
            <Card className="lg:col-span-2">
              <CardHeader>
                <CardTitle>Informacion del Torneo</CardTitle>
              </CardHeader>
              <CardContent className="space-y-4">
                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <p className="text-sm text-primary-500">Tipo</p>
                    <p className="font-medium text-primary-800">{typeLabel}</p>
                  </div>
                  <div>
                    <p className="text-sm text-primary-500">Categoria</p>
                    <p className="font-medium text-primary-800">
                      {tournament.settings?.category || "Sin categoria"}
                    </p>
                  </div>
                  <div>
                    <p className="text-sm text-primary-500">Fecha de Inicio</p>
                    <p className="font-medium text-primary-800">
                      {formatDate(tournament.startDate)}
                    </p>
                  </div>
                  <div>
                    <p className="text-sm text-primary-500">Fecha de Fin</p>
                    <p className="font-medium text-primary-800">
                      {tournament.endDate ? formatDate(tournament.endDate) : "-"}
                    </p>
                  </div>
                  <div>
                    <p className="text-sm text-primary-500">Precio Inscripcion</p>
                    <p className="font-medium text-primary-800">
                      {entryFee > 0 ? formatCurrency(entryFee) : "Gratis"}
                    </p>
                  </div>
                  <div>
                    <p className="text-sm text-primary-500">Maximo Equipos</p>
                    <p className="font-medium text-primary-800">
                      {tournament.maxPlayers || "Sin limite"}
                    </p>
                  </div>
                </div>

                {/* Site Info */}
                <div className="pt-4 border-t border-primary-100">
                  <p className="text-sm text-primary-500 mb-2">Sede</p>
                  <div className="bg-primary-50 rounded-lg p-4">
                    <p className="font-medium text-primary-800">{tournament.site.name}</p>
                    {tournament.site.address && (
                      <p className="text-sm text-primary-600">{tournament.site.address}</p>
                    )}
                    {tournament.site.phone && (
                      <p className="text-sm text-primary-600">{tournament.site.phone}</p>
                    )}
                  </div>
                </div>
              </CardContent>
            </Card>

            {/* Stats */}
            <div className="space-y-4">
              <Card>
                <CardContent className="pt-6">
                  <div className="text-center">
                    <p className="text-4xl font-bold text-primary-800">
                      {tournament._count.inscriptions}
                    </p>
                    <p className="text-sm text-primary-500">
                      {tournament.maxPlayers
                        ? `de ${tournament.maxPlayers} equipos`
                        : "equipos inscritos"}
                    </p>
                  </div>
                  {tournament.maxPlayers && (
                    <div className="mt-4">
                      <div className="h-2 bg-primary-100 rounded-full overflow-hidden">
                        <div
                          className="h-full bg-accent transition-all"
                          style={{
                            width: `${Math.min(
                              (tournament._count.inscriptions / tournament.maxPlayers) * 100,
                              100
                            )}%`,
                          }}
                        />
                      </div>
                    </div>
                  )}
                </CardContent>
              </Card>

              {tournament.matches.length > 0 && (
                <Card>
                  <CardContent className="pt-6">
                    <div className="text-center">
                      <p className="text-4xl font-bold text-primary-800">
                        {tournament.matches.filter((m) => m.status === "COMPLETED").length}
                      </p>
                      <p className="text-sm text-primary-500">
                        de {tournament.matches.length} partidos jugados
                      </p>
                    </div>
                  </CardContent>
                </Card>
              )}
            </div>
          </div>
        )}

        {/* Inscriptions Tab */}
        {activeTab === "inscriptions" && (
          <Card>
            <CardContent className="pt-6">
              <InscriptionsList
                inscriptions={tournament.inscriptions}
                entryFee={entryFee}
                onRemove={canEdit ? handleRemoveInscription : undefined}
                onTogglePaid={canEdit ? handleTogglePaid : undefined}
                canEdit={canEdit}
              />
            </CardContent>
          </Card>
        )}

        {/* Bracket Tab */}
        {activeTab === "bracket" && (
          <Card>
            <CardContent className="pt-6">
              <BracketView
                matches={tournament.matches}
                players={playersMap}
                onMatchClick={
                  tournament.status === "IN_PROGRESS"
                    ? (match) => setSelectedMatch(match)
                    : undefined
                }
              />
            </CardContent>
          </Card>
        )}
      </div>
    </div>
  );
}