"use client";

import { useEffect, useState, useTransition } from "react";
import {
  validateChallenge,
  rejectChallenge,
  updateChallenge,
  deleteChallenge,
  adminCancelChallenge,
  reactivateChallenge,
} from "@/actions/admin/challenges";
import { Button, Card, Input, Textarea, Alert } from "@/components/ui";
import { Avatar } from "@/components/ui";

interface Challenge {
  id: string;
  challenger: {
    id: string;
    username: string;
    avatar: string | null;
  };
  challenged: {
    id: string;
    username: string;
    avatar: string | null;
  };
  title: string;
  description: string;
  pointsReward: number;
  status: string;
  adminComment: string | null;
  createdAt: string;
  acceptedAt: string | null;
}

export default function ChallengeManagement() {
  const [challenges, setChallenges] = useState<Challenge[]>([]);
  const [loading, setLoading] = useState(true);
  const [selectedChallenge, setSelectedChallenge] = useState<Challenge | null>(
    null
  );
  const [editingChallenge, setEditingChallenge] = useState<Challenge | null>(
    null
  );
  const [winnerId, setWinnerId] = useState<string>("");
  const [adminComment, setAdminComment] = useState("");
  const [editTitle, setEditTitle] = useState("");
  const [editDescription, setEditDescription] = useState("");
  const [editPointsReward, setEditPointsReward] = useState<number>(0);
  const [isPending, startTransition] = useTransition();
  const [successMessage, setSuccessMessage] = useState<string | null>(null);
  const [errorMessage, setErrorMessage] = useState<string | null>(null);

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

  const fetchChallenges = async () => {
    try {
      const response = await fetch("/api/admin/challenges");
      if (response.ok) {
        const data = await response.json();
        setChallenges(data);
      }
    } catch (error) {
      console.error("Error fetching challenges:", error);
    } finally {
      setLoading(false);
    }
  };

  const handleValidate = async () => {
    if (!selectedChallenge || !winnerId) {
      setErrorMessage("Veuillez sélectionner un gagnant");
      setTimeout(() => setErrorMessage(null), 5000);
      return;
    }

    startTransition(async () => {
      const result = await validateChallenge(
        selectedChallenge.id,
        winnerId,
        adminComment || undefined
      );

      if (result.success) {
        setSuccessMessage(
          "Défi validé avec succès ! Les points ont été attribués."
        );
        setSelectedChallenge(null);
        setWinnerId("");
        setAdminComment("");
        fetchChallenges();
        setTimeout(() => setSuccessMessage(null), 5000);
      } else {
        setErrorMessage(result.error || "Erreur lors de la validation");
        setTimeout(() => setErrorMessage(null), 5000);
      }
    });
  };

  const handleReject = async () => {
    if (!selectedChallenge) return;

    if (!confirm("Êtes-vous sûr de vouloir rejeter ce défi ?")) {
      return;
    }

    startTransition(async () => {
      const result = await rejectChallenge(
        selectedChallenge.id,
        adminComment || undefined
      );

      if (result.success) {
        setSuccessMessage("Défi rejeté");
        setSelectedChallenge(null);
        setAdminComment("");
        fetchChallenges();
        setTimeout(() => setSuccessMessage(null), 5000);
      } else {
        setErrorMessage(result.error || "Erreur lors du rejet");
        setTimeout(() => setErrorMessage(null), 5000);
      }
    });
  };

  const handleEdit = (challenge: Challenge) => {
    setEditingChallenge(challenge);
    setEditTitle(challenge.title);
    setEditDescription(challenge.description);
    setEditPointsReward(challenge.pointsReward);
  };

  const handleUpdate = async () => {
    if (!editingChallenge) return;

    startTransition(async () => {
      const result = await updateChallenge(editingChallenge.id, {
        title: editTitle,
        description: editDescription,
        pointsReward: editPointsReward,
      });

      if (result.success) {
        setSuccessMessage("Défi mis à jour avec succès");
        setEditingChallenge(null);
        setEditTitle("");
        setEditDescription("");
        setEditPointsReward(0);
        fetchChallenges();
        setTimeout(() => setSuccessMessage(null), 5000);
      } else {
        setErrorMessage(result.error || "Erreur lors de la mise à jour");
        setTimeout(() => setErrorMessage(null), 5000);
      }
    });
  };

  const handleDelete = async (challengeId: string) => {
    if (
      !confirm(
        "Êtes-vous sûr de vouloir supprimer ce défi ? Cette action est irréversible."
      )
    ) {
      return;
    }

    startTransition(async () => {
      const result = await deleteChallenge(challengeId);

      if (result.success) {
        setSuccessMessage("Défi supprimé avec succès");
        fetchChallenges();
        setTimeout(() => setSuccessMessage(null), 5000);
      } else {
        setErrorMessage(result.error || "Erreur lors de la suppression");
        setTimeout(() => setErrorMessage(null), 5000);
      }
    });
  };

  const handleCancel = async (challengeId: string) => {
    if (!confirm("Êtes-vous sûr de vouloir annuler ce défi ?")) {
      return;
    }

    startTransition(async () => {
      const result = await adminCancelChallenge(challengeId);

      if (result.success) {
        setSuccessMessage("Défi annulé avec succès");
        fetchChallenges();
        setTimeout(() => setSuccessMessage(null), 5000);
      } else {
        setErrorMessage(result.error || "Erreur lors de l'annulation");
        setTimeout(() => setErrorMessage(null), 5000);
      }
    });
  };

  const handleReactivate = async (challengeId: string) => {
    if (!confirm("Êtes-vous sûr de vouloir réactiver ce défi ?")) {
      return;
    }

    startTransition(async () => {
      const result = await reactivateChallenge(challengeId);

      if (result.success) {
        setSuccessMessage("Défi réactivé avec succès");
        fetchChallenges();
        setTimeout(() => setSuccessMessage(null), 5000);
      } else {
        setErrorMessage(result.error || "Erreur lors de la réactivation");
        setTimeout(() => setErrorMessage(null), 5000);
      }
    });
  };

  if (loading) {
    return (
      <div className="text-center text-pixel-gold py-8">Chargement...</div>
    );
  }

  if (challenges.length === 0) {
    return <div className="text-center text-gray-400 py-8">Aucun défi</div>;
  }

  const acceptedChallenges = challenges.filter((c) => c.status === "ACCEPTED");
  const pendingChallenges = challenges.filter((c) => c.status === "PENDING");
  const cancelledChallenges = challenges.filter(
    (c) => c.status === "CANCELLED"
  );
  const completedChallenges = challenges.filter(
    (c) => c.status === "COMPLETED"
  );
  const rejectedChallenges = challenges.filter((c) => c.status === "REJECTED");

  return (
    <div className="space-y-4">
      {successMessage && (
        <Alert variant="success" className="mb-4">
          {successMessage}
        </Alert>
      )}
      {errorMessage && (
        <Alert variant="error" className="mb-4">
          {errorMessage}
        </Alert>
      )}
      <div className="text-sm text-gray-400 mb-4">
        {acceptedChallenges.length > 0 && (
          <span>
            {acceptedChallenges.length} défi
            {acceptedChallenges.length > 1 ? "s" : ""} en attente de désignation
            du gagnant
          </span>
        )}
        {pendingChallenges.length > 0 && (
          <span className={acceptedChallenges.length > 0 ? "ml-2" : ""}>
            • {pendingChallenges.length} défi
            {pendingChallenges.length > 1 ? "s" : ""} en attente
            d&apos;acceptation
          </span>
        )}
        {cancelledChallenges.length > 0 && (
          <span className="ml-2">
            • {cancelledChallenges.length} défi
            {cancelledChallenges.length > 1 ? "s" : ""} annulé
            {cancelledChallenges.length > 1 ? "s" : ""}
          </span>
        )}
        {completedChallenges.length > 0 && (
          <span className="ml-2">
            • {completedChallenges.length} défi
            {completedChallenges.length > 1 ? "s" : ""} complété
            {completedChallenges.length > 1 ? "s" : ""}
          </span>
        )}
        {rejectedChallenges.length > 0 && (
          <span className="ml-2">
            • {rejectedChallenges.length} défi
            {rejectedChallenges.length > 1 ? "s" : ""} rejeté
            {rejectedChallenges.length > 1 ? "s" : ""}
          </span>
        )}
      </div>

      {challenges.map((challenge) => (
        <Card key={challenge.id} variant="dark" className="p-4">
          <div className="flex items-start justify-between gap-4">
            <div className="flex-1">
              <h3 className="text-lg font-bold text-pixel-gold mb-2">
                {challenge.title}
              </h3>
              <p className="text-gray-300 mb-4">{challenge.description}</p>

              <div className="flex items-center gap-4 mb-4">
                <div className="flex items-center gap-2">
                  <Avatar
                    src={challenge.challenger.avatar}
                    username={challenge.challenger.username}
                    size="sm"
                  />
                  <span className="text-sm text-gray-300">
                    {challenge.challenger.username}
                  </span>
                  <span className="text-xs text-gray-500">VS</span>
                  <Avatar
                    src={challenge.challenged.avatar}
                    username={challenge.challenged.username}
                    size="sm"
                  />
                  <span className="text-sm text-gray-300">
                    {challenge.challenged.username}
                  </span>
                </div>
              </div>

              <div className="text-sm text-gray-400">
                Récompense:{" "}
                <span className="text-pixel-gold font-bold">
                  {challenge.pointsReward} points
                </span>
              </div>
              <div className="text-xs mt-2">
                <span
                  className={`px-2 py-1 rounded ${
                    challenge.status === "ACCEPTED"
                      ? "bg-blue-500/20 text-blue-400"
                      : challenge.status === "COMPLETED"
                        ? "bg-green-500/20 text-green-400"
                        : challenge.status === "CANCELLED"
                          ? "bg-gray-500/20 text-gray-400"
                          : challenge.status === "REJECTED"
                            ? "bg-red-500/20 text-red-400"
                            : "bg-yellow-500/20 text-yellow-400"
                  }`}
                >
                  {challenge.status === "PENDING"
                    ? "En attente d'acceptation"
                    : challenge.status === "ACCEPTED"
                      ? "En cours - En attente de désignation du gagnant"
                      : challenge.status === "COMPLETED"
                        ? "Complété"
                        : challenge.status === "CANCELLED"
                          ? "Annulé"
                          : challenge.status === "REJECTED"
                            ? "Rejeté"
                            : challenge.status}
                </span>
              </div>
              {challenge.acceptedAt && (
                <div className="text-xs text-gray-500 mt-2">
                  Accepté le:{" "}
                  {new Date(challenge.acceptedAt).toLocaleDateString("fr-FR")}
                </div>
              )}
            </div>

            <div className="flex flex-col gap-2">
              <Button
                onClick={() => handleEdit(challenge)}
                variant="secondary"
                size="sm"
              >
                Modifier
              </Button>
              {challenge.status === "ACCEPTED" && (
                <Button
                  onClick={() => setSelectedChallenge(challenge)}
                  variant="primary"
                  size="sm"
                >
                  Désigner le gagnant
                </Button>
              )}
              {challenge.status !== "CANCELLED" &&
                challenge.status !== "COMPLETED" && (
                  <Button
                    onClick={() => handleCancel(challenge.id)}
                    variant="secondary"
                    size="sm"
                    disabled={isPending}
                  >
                    Annuler
                  </Button>
                )}
              {challenge.status === "CANCELLED" && (
                <Button
                  onClick={() => handleReactivate(challenge.id)}
                  variant="primary"
                  size="sm"
                  disabled={isPending}
                >
                  Réactiver
                </Button>
              )}
              <Button
                onClick={() => handleDelete(challenge.id)}
                variant="secondary"
                size="sm"
                className="text-destructive hover:text-destructive"
                style={{
                  color: "var(--destructive)",
                  borderColor: "var(--destructive)",
                }}
              >
                Supprimer
              </Button>
            </div>
          </div>
        </Card>
      ))}

      {/* Modal de validation */}
      {selectedChallenge && (
        <div
          className="fixed inset-0 z-[200] flex items-center justify-center p-4 bg-black/80 backdrop-blur-sm"
          onClick={() => {
            setSelectedChallenge(null);
            setWinnerId("");
            setAdminComment("");
          }}
        >
          <Card
            variant="dark"
            className="max-w-2xl w-full max-h-[90vh] overflow-y-auto"
            onClick={(e) => e.stopPropagation()}
          >
            <div className="p-6">
              <h2 className="text-2xl font-bold text-pixel-gold mb-4">
                Désigner le gagnant
              </h2>

              <div className="mb-6">
                <h3 className="text-lg font-bold text-gray-300 mb-2">
                  {selectedChallenge.title}
                </h3>
                <p className="text-gray-400 mb-4">
                  {selectedChallenge.description}
                </p>

                <div className="flex items-center gap-4 mb-4">
                  <div className="flex items-center gap-2">
                    <Avatar
                      src={selectedChallenge.challenger.avatar}
                      username={selectedChallenge.challenger.username}
                      size="md"
                    />
                    <span className="text-gray-300">
                      {selectedChallenge.challenger.username}
                    </span>
                  </div>
                  <span className="text-gray-500">VS</span>
                  <div className="flex items-center gap-2">
                    <Avatar
                      src={selectedChallenge.challenged.avatar}
                      username={selectedChallenge.challenged.username}
                      size="md"
                    />
                    <span className="text-gray-300">
                      {selectedChallenge.challenged.username}
                    </span>
                  </div>
                </div>
              </div>

              <div className="mb-4">
                <label className="block text-sm font-bold text-pixel-gold mb-2">
                  Sélectionner le gagnant
                </label>
                <div className="flex gap-4">
                  <label className="flex items-center gap-2 cursor-pointer">
                    <input
                      type="radio"
                      name="winner"
                      value={selectedChallenge.challenger.id}
                      checked={winnerId === selectedChallenge.challenger.id}
                      onChange={(e) => setWinnerId(e.target.value)}
                      className="w-4 h-4"
                    />
                    <span className="text-gray-300">
                      {selectedChallenge.challenger.username}
                    </span>
                  </label>
                  <label className="flex items-center gap-2 cursor-pointer">
                    <input
                      type="radio"
                      name="winner"
                      value={selectedChallenge.challenged.id}
                      checked={winnerId === selectedChallenge.challenged.id}
                      onChange={(e) => setWinnerId(e.target.value)}
                      className="w-4 h-4"
                    />
                    <span className="text-gray-300">
                      {selectedChallenge.challenged.username}
                    </span>
                  </label>
                </div>
              </div>

              <div className="mb-4">
                <label className="block text-sm font-bold text-pixel-gold mb-2">
                  Commentaire (optionnel)
                </label>
                <textarea
                  value={adminComment}
                  onChange={(e) => setAdminComment(e.target.value)}
                  className="w-full p-2 bg-black/60 border border-pixel-gold/30 rounded text-gray-300"
                  rows={3}
                  placeholder="Commentaire pour les joueurs..."
                />
              </div>

              <div className="flex gap-4">
                <Button
                  onClick={handleValidate}
                  variant="primary"
                  disabled={!winnerId || isPending}
                  className="flex-1"
                >
                  {isPending ? "Enregistrement..." : "Confirmer le gagnant"}
                </Button>
                <Button
                  onClick={handleReject}
                  variant="secondary"
                  disabled={isPending}
                  className="flex-1"
                >
                  {isPending ? "Rejet..." : "Rejeter le défi"}
                </Button>
                <Button
                  onClick={() => {
                    setSelectedChallenge(null);
                    setWinnerId("");
                    setAdminComment("");
                  }}
                  variant="secondary"
                  disabled={isPending}
                >
                  Annuler
                </Button>
              </div>
            </div>
          </Card>
        </div>
      )}

      {/* Modal d'édition */}
      {editingChallenge && (
        <div
          className="fixed inset-0 z-[200] flex items-center justify-center p-4 bg-black/80 backdrop-blur-sm"
          onClick={() => {
            setEditingChallenge(null);
            setEditTitle("");
            setEditDescription("");
            setEditPointsReward(0);
          }}
        >
          <Card
            variant="dark"
            className="max-w-2xl w-full max-h-[90vh] overflow-y-auto"
            onClick={(e) => e.stopPropagation()}
          >
            <div className="p-6">
              <h2 className="text-2xl font-bold text-pixel-gold mb-4">
                Modifier le défi
              </h2>

              <div className="space-y-4">
                <Input
                  id="edit-title"
                  label="Titre"
                  value={editTitle}
                  onChange={(e) => setEditTitle(e.target.value)}
                  required
                  placeholder="Titre du défi"
                />

                <Textarea
                  id="edit-description"
                  label="Description"
                  value={editDescription}
                  onChange={(e) => setEditDescription(e.target.value)}
                  required
                  rows={4}
                  placeholder="Description du défi"
                />

                <Input
                  id="edit-points"
                  label="Récompense (points)"
                  type="number"
                  min="1"
                  value={editPointsReward}
                  onChange={(e) =>
                    setEditPointsReward(parseInt(e.target.value) || 0)
                  }
                  required
                  placeholder="100"
                />

                <div className="flex gap-4 pt-4">
                  <Button
                    onClick={handleUpdate}
                    variant="primary"
                    disabled={
                      isPending ||
                      !editTitle ||
                      !editDescription ||
                      editPointsReward <= 0
                    }
                    className="flex-1"
                  >
                    {isPending ? "Mise à jour..." : "Enregistrer"}
                  </Button>
                  <Button
                    onClick={() => {
                      setEditingChallenge(null);
                      setEditTitle("");
                      setEditDescription("");
                      setEditPointsReward(0);
                    }}
                    variant="secondary"
                    disabled={isPending}
                  >
                    Annuler
                  </Button>
                </div>
              </div>
            </div>
          </Card>
        </div>
      )}
    </div>
  );
}
