'use client';

import { useState, useEffect, useCallback } from 'react';
import DriverIdentity from '@/components/drivers/DriverIdentity';
import type { DriverDTO } from '@gridpilot/racing/application/dto/DriverDTO';
import { EntityMappers } from '@gridpilot/racing/application/mappers/EntityMappers';
import { getDriverRepository, getDriverStats } from '@/lib/di-container';
import {
  getLeagueMembers,
  type LeagueMembership,
  type MembershipRole,
} from '@/lib/leagueMembership';
import { useEffectiveDriverId } from '@/lib/currentDriver';

interface LeagueMembersProps {
  leagueId: string;
  onRemoveMember?: (driverId: string) => void;
  onUpdateRole?: (driverId: string, role: MembershipRole) => void;
  showActions?: boolean;
}

export default function LeagueMembers({
  leagueId,
  onRemoveMember,
  onUpdateRole,
  showActions = false
}: LeagueMembersProps) {
  const [members, setMembers] = useState<LeagueMembership[]>([]);
  const [driversById, setDriversById] = useState<Record<string, DriverDTO>>({});
  const [loading, setLoading] = useState(true);
  const [sortBy, setSortBy] = useState<'role' | 'name' | 'date' | 'rating' | 'points' | 'wins'>('rating');
  const currentDriverId = useEffectiveDriverId();

  const loadMembers = useCallback(async () => {
    setLoading(true);
    try {
      const membershipData = getLeagueMembers(leagueId);
      setMembers(membershipData);

      const driverRepo = getDriverRepository();
      const driverEntities = await Promise.all(
        membershipData.map((m) => driverRepo.findById(m.driverId))
      );
      const driverDtos = driverEntities
        .map((driver) => (driver ? EntityMappers.toDriverDTO(driver) : null))
        .filter((dto): dto is DriverDTO => dto !== null);

      const byId: Record<string, DriverDTO> = {};
      for (const dto of driverDtos) {
        byId[dto.id] = dto;
      }
      setDriversById(byId);
    } catch (error) {
      console.error('Failed to load members:', error);
    } finally {
      setLoading(false);
    }
  }, [leagueId]);

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

  const getDriverName = (driverId: string): string => {
    const driver = driversById[driverId];
    return driver?.name || 'Unknown Driver';
  };

  const getRoleOrder = (role: MembershipRole): number => {
    const order = { owner: 0, admin: 1, steward: 2, member: 3 };
    return order[role];
  };

  const sortedMembers = [...members].sort((a, b) => {
    switch (sortBy) {
      case 'role':
        return getRoleOrder(a.role) - getRoleOrder(b.role);
      case 'name':
        return getDriverName(a.driverId).localeCompare(getDriverName(b.driverId));
      case 'date':
        return new Date(b.joinedAt).getTime() - new Date(a.joinedAt).getTime();
      case 'rating': {
        const statsA = getDriverStats(a.driverId);
        const statsB = getDriverStats(b.driverId);
        return (statsB?.rating || 0) - (statsA?.rating || 0);
      }
      case 'points':
        return 0;
      case 'wins': {
        const statsA = getDriverStats(a.driverId);
        const statsB = getDriverStats(b.driverId);
        return (statsB?.wins || 0) - (statsA?.wins || 0);
      }
      default:
        return 0;
    }
  });

  const getRoleBadgeColor = (role: MembershipRole): string => {
    switch (role) {
      case 'owner':
        return 'bg-yellow-500/10 text-yellow-500 border-yellow-500/30';
      case 'admin':
        return 'bg-purple-500/10 text-purple-400 border-purple-500/30';
      case 'steward':
        return 'bg-blue-500/10 text-blue-400 border-blue-500/30';
      case 'member':
        return 'bg-primary-blue/10 text-primary-blue border-primary-blue/30';
    }
  };

  if (loading) {
    return (
      <div className="text-center py-8 text-gray-400">
        Loading members...
      </div>
    );
  }

  if (members.length === 0) {
    return (
      <div className="text-center py-8 text-gray-400">
        No members found
      </div>
    );
  }

  return (
    <div>
      {/* Sort Controls */}
      <div className="mb-4 flex items-center justify-between">
        <p className="text-sm text-gray-400">
          {members.length} {members.length === 1 ? 'member' : 'members'}
        </p>
        <div className="flex items-center gap-2">
          <label className="text-sm text-gray-400">Sort by:</label>
          <select
            value={sortBy}
            onChange={(e) => setSortBy(e.target.value as any)}
            className="px-3 py-1 bg-deep-graphite border border-charcoal-outline rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-primary-blue"
          >
            <option value="rating">Rating</option>
            <option value="points">Points</option>
            <option value="wins">Wins</option>
            <option value="role">Role</option>
            <option value="name">Name</option>
            <option value="date">Join Date</option>
          </select>
        </div>
      </div>

      {/* Members Table */}
      <div className="overflow-x-auto">
        <table className="w-full">
          <thead>
            <tr className="border-b border-charcoal-outline">
              <th className="text-left py-3 px-4 text-sm font-semibold text-gray-400">Driver</th>
              <th className="text-left py-3 px-4 text-sm font-semibold text-gray-400">Rating</th>
              <th className="text-left py-3 px-4 text-sm font-semibold text-gray-400">Rank</th>
              <th className="text-left py-3 px-4 text-sm font-semibold text-gray-400">Wins</th>
              <th className="text-left py-3 px-4 text-sm font-semibold text-gray-400">Role</th>
              <th className="text-left py-3 px-4 text-sm font-semibold text-gray-400">Joined</th>
              {showActions && <th className="text-right py-3 px-4 text-sm font-semibold text-gray-400">Actions</th>}
            </tr>
          </thead>
          <tbody>
            {sortedMembers.map((member, index) => {
              const isCurrentUser = member.driverId === currentDriverId;
              const cannotModify = member.role === 'owner';
              const driverStats = getDriverStats(member.driverId);
              const isTopPerformer = index < 3 && sortBy === 'rating';
              const driver = driversById[member.driverId];
              const roleLabel =
                member.role.charAt(0).toUpperCase() + member.role.slice(1);
              const ratingAndWinsMeta =
                driverStats && typeof driverStats.rating === 'number'
                  ? `Rating ${driverStats.rating} • ${driverStats.wins ?? 0} wins`
                  : null;

              return (
                <tr
                  key={member.driverId}
                  className={`border-b border-charcoal-outline/50 hover:bg-iron-gray/20 transition-colors ${isTopPerformer ? 'bg-primary-blue/5' : ''}`}
                >
                  <td className="py-3 px-4">
                    <div className="flex items-center gap-2">
                      {driver ? (
                        <DriverIdentity
                          driver={driver}
                          href={`/drivers/${member.driverId}?from=league-members&leagueId=${leagueId}`}
                          contextLabel={roleLabel}
                          meta={ratingAndWinsMeta}
                          size="md"
                        />
                      ) : (
                        <span className="text-white">Unknown Driver</span>
                      )}
                      {isCurrentUser && (
                        <span className="text-xs text-gray-500">(You)</span>
                      )}
                      {isTopPerformer && (
                        <span className="text-xs">⭐</span>
                      )}
                    </div>
                  </td>
                  <td className="py-3 px-4">
                    <span className="text-primary-blue font-medium">
                      {driverStats?.rating || '—'}
                    </span>
                  </td>
                  <td className="py-3 px-4">
                    <span className="text-gray-300">
                      #{driverStats?.overallRank || '—'}
                    </span>
                  </td>
                  <td className="py-3 px-4">
                    <span className="text-green-400 font-medium">
                      {driverStats?.wins || 0}
                    </span>
                  </td>
                  <td className="py-3 px-4">
                    <span className={`px-2 py-1 text-xs font-medium rounded border ${getRoleBadgeColor(member.role)}`}>
                      {member.role.charAt(0).toUpperCase() + member.role.slice(1)}
                    </span>
                  </td>
                  <td className="py-3 px-4">
                    <span className="text-white text-sm">
                      {new Date(member.joinedAt).toLocaleDateString('en-US', {
                        year: 'numeric',
                        month: 'short',
                        day: 'numeric',
                      })}
                    </span>
                  </td>
                  {showActions && (
                    <td className="py-3 px-4 text-right">
                      {!cannotModify && !isCurrentUser && (
                        <div className="flex items-center justify-end gap-2">
                          {onUpdateRole && (
                            <select
                              value={member.role}
                              onChange={(e) => onUpdateRole(member.driverId, e.target.value as MembershipRole)}
                              className="px-2 py-1 bg-deep-graphite border border-charcoal-outline rounded text-white text-xs focus:outline-none focus:ring-2 focus:ring-primary-blue"
                            >
                              <option value="member">Member</option>
                              <option value="steward">Steward</option>
                              <option value="admin">Admin</option>
                            </select>
                          )}
                          {onRemoveMember && (
                            <button
                              onClick={() => onRemoveMember(member.driverId)}
                              className="px-2 py-1 text-xs font-medium text-red-400 hover:text-red-300 hover:bg-red-500/10 rounded transition-colors"
                            >
                              Remove
                            </button>
                          )}
                        </div>
                      )}
                      {cannotModify && (
                        <span className="text-xs text-gray-500">—</span>
                      )}
                    </td>
                  )}
                </tr>
              );
            })}
          </tbody>
        </table>
      </div>
    </div>
  );
}