import { memo, useEffect, useMemo, useState } from "react";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "~/components/ui/select";
import { DraftPickCell } from "./DraftPickCell";
import { type DraftPick, groupPicksByTeamAndSport } from "./picks-utils";

interface TeamRosterViewProps {
  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 TeamRosterView = memo(function TeamRosterView({
  draftSlots,
  ownerMap = {},
  picks,
  sports,
  totalRounds,
}: TeamRosterViewProps) {
  const [selectedTeamId, setSelectedTeamId] = useState(
    draftSlots[0]?.team.id ?? ""
  );

  useEffect(() => {
    if (
      draftSlots.length > 0 &&
      !draftSlots.some((s) => s.team.id === selectedTeamId)
    ) {
      setSelectedTeamId(draftSlots[0].team.id);
    }
  }, [draftSlots, selectedTeamId]);

  const picksByTeamAndSport = useMemo(
    () => groupPicksByTeamAndSport(picks),
    [picks]
  );

  const teamPicks = useMemo(
    () => picksByTeamAndSport.get(selectedTeamId),
    [picksByTeamAndSport, selectedTeamId]
  );

  const flexPicksAvailable = useMemo(
    () => Math.max(0, totalRounds - sports.length),
    [totalRounds, sports.length]
  );

  const flexPicksUsed = useMemo(() => {
    let used = 0;
    teamPicks?.forEach((sportPicks) => {
      if (sportPicks.length > 1) used += sportPicks.length - 1;
    });
    return used;
  }, [teamPicks]);

  const flexPicksRemaining = useMemo(
    () => flexPicksAvailable - flexPicksUsed,
    [flexPicksAvailable, flexPicksUsed]
  );

  const missingSports = useMemo(
    () => sports.filter((s) => (teamPicks?.get(s.id)?.length ?? 0) === 0),
    [sports, teamPicks]
  );

  const draftedSports = useMemo(
    () => sports.filter((s) => (teamPicks?.get(s.id)?.length ?? 0) > 0),
    [sports, teamPicks]
  );

  const flexColor =
    flexPicksAvailable === 0
      ? "text-muted-foreground"
      : flexPicksRemaining <= 0
        ? "text-destructive"
        : flexPicksRemaining <= Math.ceil(flexPicksAvailable * 0.25)
          ? "text-amber-500 dark:text-amber-400"
          : "text-emerald-500 dark:text-emerald-400";

  if (draftSlots.length === 0) {
    return (
      <div className="flex items-center justify-center h-full p-8 text-muted-foreground">
        <p>No teams in this draft.</p>
      </div>
    );
  }

  return (
    <div className="h-full overflow-y-auto">
      <div className="p-4 space-y-4">
        {/* Team selector */}
        <div className="space-y-1">
          <label
            htmlFor="roster-team-select"
            className="text-xs font-medium text-muted-foreground"
          >
            Team
          </label>
          <Select value={selectedTeamId} onValueChange={setSelectedTeamId}>
            <SelectTrigger id="roster-team-select" className="w-full">
              <SelectValue placeholder="Select a team" />
            </SelectTrigger>
            <SelectContent>
              {draftSlots.map((slot) => (
                <SelectItem key={slot.id} value={slot.team.id}>
                  {ownerMap[slot.team.id] || slot.team.name}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
        </div>

        {/* Mini dashboard */}
        <div className="grid grid-cols-2 gap-3">
          <div className="rounded-lg border bg-card px-3 py-2.5 space-y-0.5">
            <p className="text-xs text-muted-foreground font-medium">Flex Picks</p>
            {flexPicksAvailable === 0 ? (
              <p className="text-sm font-semibold text-muted-foreground">N/A</p>
            ) : (
              <>
                <p className={`text-xl font-bold tabular-nums leading-none ${flexColor}`}>
                  {flexPicksRemaining}
                  <span className="text-sm font-normal text-muted-foreground ml-1">
                    / {flexPicksAvailable}
                  </span>
                </p>
                <p className="text-xs text-muted-foreground">remaining</p>
              </>
            )}
          </div>
          <div className="rounded-lg border bg-card px-3 py-2.5 space-y-0.5">
            <p className="text-xs text-muted-foreground font-medium">Sports Remaining</p>
            <p className={`text-xl font-bold tabular-nums leading-none ${missingSports.length > 0 ? "text-foreground" : "text-emerald-500 dark:text-emerald-400"}`}>
              {missingSports.length}
              <span className="text-sm font-normal text-muted-foreground ml-1">
                / {sports.length}
              </span>
            </p>
            <p className="text-xs text-muted-foreground">to draft</p>
          </div>
        </div>

        {/* Missing sports list */}
        {missingSports.length > 0 && (
          <div>
            <p className="text-xs font-semibold uppercase tracking-wider text-muted-foreground mb-1.5">Still Needed</p>
            <p className="text-sm text-muted-foreground">
              {missingSports.map((s) => s.name).join(" · ")}
            </p>
          </div>
        )}

        {/* Per-sport pick cells */}
        {draftedSports.length === 0 ? (
          <p className="text-sm text-muted-foreground text-center py-6">No picks yet</p>
        ) : (
          <div className="space-y-3">
            {draftedSports.map((sport) => {
              const sportPicks = teamPicks?.get(sport.id) ?? [];
              return (
                <div key={sport.id}>
                  <p className="text-xs font-semibold uppercase tracking-wider text-muted-foreground mb-1.5">
                    {sport.name}
                  </p>
                  <div className="flex flex-wrap gap-1">
                    {sportPicks.map((pick) => (
                      <DraftPickCell
                        key={pick.id}
                        pickNumber={pick.pickNumber}
                        round={pick.round}
                        pickInRound={pick.pickInRound}
                        state="picked"
                        pick={pick}
                        corona="gradient"
                        className="w-44 flex-none"
                      />
                    ))}
                  </div>
                </div>
              );
            })}
          </div>
        )}
      </div>
    </div>
  );
});