import { Link } from "react-router";
import { Table, TableHeader, TableRow, TableHead, TableBody, TableCell } from "~/components/ui/table";
import { Badge } from "~/components/ui/badge";
import { type TeamStanding } from "~/types/standings";

interface StandingsTableProps {
  standings: TeamStanding[];
  leagueId: string;
  seasonId: string;
  showPlacementBreakdown?: boolean;
}

/**
 * Display team standings with ranking, points, and placement breakdown
 * Phase 4.1: Enhanced standings table with tiebreakers
 * Phase 4.3: Added clickable links to team breakdown pages
 */
export function StandingsTable({
  standings,
  leagueId,
  seasonId,
  showPlacementBreakdown = true,
}: StandingsTableProps) {
  return (
    <div className="rounded-md border">
      <Table>
        <TableHeader>
          <TableRow>
            <TableHead className="w-[80px]">Rank</TableHead>
            <TableHead>Team</TableHead>
            <TableHead className="text-right">Points</TableHead>
            <TableHead className="text-right">Projected</TableHead>
            {showPlacementBreakdown && (
              <TableHead className="text-center">Placements</TableHead>
            )}
            <TableHead className="text-right">Remaining</TableHead>
          </TableRow>
        </TableHeader>
        <TableBody>
          {standings.length === 0 ? (
            <TableRow>
              <TableCell colSpan={showPlacementBreakdown ? 6 : 5} className="text-center text-muted-foreground">
                No standings data available
              </TableCell>
            </TableRow>
          ) : (
            standings.map((standing) => (
              <TableRow key={standing.teamId}>
                <TableCell>
                  <div className="flex items-center gap-2">
                    <RankBadge rank={standing.currentRank} />
                    {standing.rankChange !== 0 && (
                      <MovementIndicator change={standing.rankChange} />
                    )}
                  </div>
                </TableCell>
                <TableCell className="font-medium">
                  <Link
                    to={`/leagues/${leagueId}/standings/${seasonId}/teams/${standing.teamId}`}
                    className="hover:underline hover:text-primary transition-colors"
                  >
                    {standing.teamName}
                  </Link>
                </TableCell>
                <TableCell className="text-right font-semibold">
                  {standing.actualPoints !== null && standing.actualPoints !== undefined
                    ? standing.actualPoints.toFixed(1)
                    : standing.totalPoints.toFixed(1)}
                </TableCell>
                <TableCell className="text-right">
                  {standing.projectedPoints !== null && standing.projectedPoints !== undefined ? (
                    <div className="flex flex-col">
                      <span className="font-semibold text-primary">
                        {standing.projectedPoints.toFixed(1)}
                      </span>
                      {standing.participantsRemaining > 0 && (
                        <span className="text-xs text-muted-foreground">
                          +{(standing.projectedPoints - (standing.actualPoints ?? standing.totalPoints)).toFixed(1)} EV
                        </span>
                      )}
                    </div>
                  ) : (
                    <span className="text-muted-foreground">-</span>
                  )}
                </TableCell>
                {showPlacementBreakdown && (
                  <TableCell>
                    <PlacementBreakdown placements={standing.placementCounts} />
                  </TableCell>
                )}
                <TableCell className="text-right text-muted-foreground">
                  {standing.participantsRemaining > 0 ? (
                    <Badge variant="secondary">
                      {standing.participantsRemaining} remaining
                    </Badge>
                  ) : (
                    <Badge variant="outline">Complete</Badge>
                  )}
                </TableCell>
              </TableRow>
            ))
          )}
        </TableBody>
      </Table>
    </div>
  );
}

/**
 * Display rank badge with special styling for top 3
 */
function RankBadge({ rank }: { rank: number }) {
  if (rank === 1) {
    return (
      <Badge className="bg-yellow-500 hover:bg-yellow-600 text-white font-bold">
        🏆 1st
      </Badge>
    );
  }

  if (rank === 2) {
    return (
      <Badge className="bg-gray-400 hover:bg-gray-500 text-white font-bold">
        🥈 2nd
      </Badge>
    );
  }

  if (rank === 3) {
    return (
      <Badge className="bg-orange-600 hover:bg-orange-700 text-white font-bold">
        🥉 3rd
      </Badge>
    );
  }

  return (
    <Badge variant="outline" className="font-semibold">
      {rank}
    </Badge>
  );
}

/**
 * Show movement indicator (up/down arrow)
 */
function MovementIndicator({ change }: { change: number }) {
  if (change > 0) {
    return (
      <span className="text-green-600 text-sm font-medium" title={`Up ${change} ${change === 1 ? 'place' : 'places'}`}>
        ↑{change}
      </span>
    );
  }

  if (change < 0) {
    return (
      <span className="text-red-600 text-sm font-medium" title={`Down ${Math.abs(change)} ${Math.abs(change) === 1 ? 'place' : 'places'}`}>
        ↓{Math.abs(change)}
      </span>
    );
  }

  return null;
}

/**
 * Display placement breakdown showing counts for each placement (1st-8th)
 */
function PlacementBreakdown({
  placements,
}: {
  placements: {
    first: number;
    second: number;
    third: number;
    fourth: number;
    fifth: number;
    sixth: number;
    seventh: number;
    eighth: number;
  };
}) {
  const items = [
    { label: "1st", count: placements.first, color: "text-yellow-600" },
    { label: "2nd", count: placements.second, color: "text-gray-500" },
    { label: "3rd", count: placements.third, color: "text-orange-600" },
    { label: "4th", count: placements.fourth, color: "text-blue-600" },
    { label: "5th", count: placements.fifth, color: "text-purple-600" },
    { label: "6th", count: placements.sixth, color: "text-green-600" },
    { label: "7th", count: placements.seventh, color: "text-pink-600" },
    { label: "8th", count: placements.eighth, color: "text-indigo-600" },
  ];

  // Only show placements that have counts > 0
  const nonZero = items.filter((item) => item.count > 0);

  if (nonZero.length === 0) {
    return <span className="text-muted-foreground text-sm">None yet</span>;
  }

  return (
    <div className="flex flex-wrap gap-2 justify-center">
      {nonZero.map((item) => (
        <span
          key={item.label}
          className={`text-sm font-medium ${item.color}`}
          title={`${item.count} ${item.label} place ${item.count === 1 ? 'finish' : 'finishes'}`}
        >
          {item.label}×{item.count}
        </span>
      ))}
    </div>
  );
}