import { memo, useMemo } from "react";
import { type DraftPick, groupPicksByTeamAndSport } from "./picks-utils";

interface DraftSummaryViewProps {
  draftSlots: Array<{ id: string; team: { id: string; name: string } }>;
  ownerMap?: Record<string, string>;
  picks: DraftPick[];
  sports: Array<{ id: string; name: string }>;
  totalRounds: number;
}

export const DraftSummaryView = memo(function DraftSummaryView({
  draftSlots,
  ownerMap = {},
  picks,
  sports,
  totalRounds,
}: DraftSummaryViewProps) {
  const picksByTeamAndSport = useMemo(
    () => groupPicksByTeamAndSport(picks),
    [picks]
  );

  const sportStats = useMemo(() => {
    const map = new Map<string, { total: number; teams: number }>();
    sports.forEach((sport) => map.set(sport.id, { total: 0, teams: 0 }));
    picksByTeamAndSport.forEach((teamMap) => {
      teamMap.forEach((teamSportPicks, sportId) => {
        const stat = map.get(sportId);
        if (stat && teamSportPicks.length > 0) {
          stat.total += teamSportPicks.length;
          stat.teams++;
        }
      });
    });
    return map;
  }, [picksByTeamAndSport, sports]);

  const flexPicksAvailable = Math.max(0, totalRounds - sports.length);

  const flexPicksUsedByTeam = useMemo(() => {
    const map = new Map<string, number>();
    picksByTeamAndSport.forEach((teamMap, teamId) => {
      let used = 0;
      teamMap.forEach((teamSportPicks) => {
        if (teamSportPicks.length > 1) used += teamSportPicks.length - 1;
      });
      map.set(teamId, used);
    });
    return map;
  }, [picksByTeamAndSport]);

  if (sports.length === 0) {
    return (
      <div className="flex items-center justify-center h-full p-8 text-muted-foreground">
        <p>No sports have been configured for this season.</p>
      </div>
    );
  }

  return (
    <div className="w-full h-full overflow-auto">
      <table className="w-full border-collapse">
        <thead className="sticky top-0 bg-background z-10">
          <tr>
            <th
              scope="col"
              className="border-r border-b border-border p-2 text-left font-semibold bg-muted sticky left-0 z-20 min-w-[120px]"
            >
              Sport
            </th>
            <th
              scope="col"
              className="border-r border-b border-border p-2 text-center font-semibold bg-muted min-w-[48px]"
            >
              Total
            </th>
            {draftSlots.map((slot, index) => {
              const displayName = ownerMap[slot.team.id] || slot.team.name;
              const isLast = index === draftSlots.length - 1;
              const used = flexPicksUsedByTeam.get(slot.team.id) ?? 0;
              const flexesExhausted = flexPicksAvailable > 0 && used >= flexPicksAvailable;
              return (
                <th
                  key={slot.id}
                  scope="col"
                  className={`border-b border-border p-2 text-center font-semibold bg-muted/50 min-w-[60px] ${!isLast ? "border-r" : ""}`}
                >
                  <span className="text-sm">{displayName}</span>
                  {flexPicksAvailable > 0 && (
                    <div className={`text-xs mt-0.5 ${flexesExhausted ? "text-destructive font-medium" : "font-normal text-muted-foreground"}`}>
                      {used} of {flexPicksAvailable} flexes
                    </div>
                  )}
                </th>
              );
            })}
          </tr>
        </thead>
        <tbody>
          {sports.map((sport, sportIndex) => {
            const isLastRow = sportIndex === sports.length - 1;
            const { total: sportTotal, teams: sportTeamCount } = sportStats.get(sport.id) ?? { total: 0, teams: 0 };
            return (
              <tr key={sport.id}>
                <th
                  scope="row"
                  className={`border-r border-border p-2 font-medium text-sm text-left bg-muted sticky left-0 z-10 ${!isLastRow ? "border-b" : ""}`}
                >
                  {sport.name}
                </th>
                <td
                  className={`border-r border-border p-2 text-center text-sm font-semibold bg-muted/30 ${!isLastRow ? "border-b" : ""}`}
                >
                  {sportTotal > 0 ? (
                    <>
                      <div>{sportTotal}</div>
                      <div className="text-xs font-normal text-muted-foreground mt-0.5">
                        {sportTeamCount} team{sportTeamCount !== 1 ? "s" : ""}
                      </div>
                    </>
                  ) : null}
                </td>
                {draftSlots.map((slot, slotIndex) => {
                  const count =
                    picksByTeamAndSport.get(slot.team.id)?.get(sport.id)
                      ?.length ?? 0;
                  const isLast = slotIndex === draftSlots.length - 1;
                  return (
                    <td
                      key={`${slot.team.id}-${sport.id}`}
                      className={`border-border p-2 text-center text-sm ${
                        count >= 2 ? "bg-accent/30 font-semibold" : "bg-background"
                      } ${!isLastRow ? "border-b" : ""} ${!isLast ? "border-r" : ""}`}
                    >
                      {count > 0 ? count : null}
                    </td>
                  );
                })}
              </tr>
            );
          })}
        </tbody>
      </table>
    </div>
  );
});