import { Trophy } from "lucide-react";
import { LeaderboardPagination } from "@/components/leaderboard/leaderboard-pagination";
import { Badge } from "@/components/ui/badge";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import {
  Table,
  TableBody,
  TableCaption,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import {
  formatInteger,
  formatVoiceDuration,
  resolveLeaderboardName,
  shortenDiscordId,
  type LeaderboardPage,
  type VoiceLeaderboardRow,
  type XpLeaderboardRow,
} from "@/lib/leaderboard/ranking";

type LeaderboardBoardProps =
  | {
      kind: "xp";
      data: LeaderboardPage<XpLeaderboardRow>;
      searchQuery: string;
      channelId?: never;
    }
  | {
      kind: "vc";
      data: LeaderboardPage<VoiceLeaderboardRow>;
      searchQuery: string;
      channelId?: string;
    };

function rankVariant(rank: number) {
  if (rank === 1) return "default";
  if (rank === 2) return "secondary";
  return "outline";
}

function Identity({
  displayName,
  username,
  userId,
}: {
  displayName: string | null;
  username: string | null;
  userId: string;
}) {
  const unresolved = !displayName?.trim() && !username?.trim();

  return (
    <div className="flex min-w-40 flex-col gap-0.5">
      <span className="font-medium">
        {resolveLeaderboardName({ displayName, username, userId })}
      </span>
      <span className="text-xs text-muted-foreground">
        {unresolved
          ? `Discord ID: ${shortenDiscordId(userId)}`
          : displayName?.trim() && username?.trim()
            ? `@${username}`
            : `Discord ID: ${shortenDiscordId(userId)}`}
      </span>
    </div>
  );
}

function Podium({ data }: LeaderboardBoardProps) {
  if (data.podium.length === 0) return null;

  return (
    <section aria-labelledby="podium-title" className="flex flex-col gap-3">
      <h2 id="podium-title" className="text-lg font-medium">สามอันดับนำ</h2>
      <div className="grid gap-3 md:grid-cols-3">
        {data.podium.map((row) => (
          <Card
            key={row.userId}
            size="sm"
            className={row.rank === 1 ? "md:-translate-y-1" : undefined}
          >
            <CardHeader>
              <CardTitle className="flex items-center justify-between gap-3">
                <span className="truncate">
                  {resolveLeaderboardName(row)}
                </span>
                <Badge variant={rankVariant(row.rank)}>
                  {row.rank === 1 && <Trophy data-icon="inline-start" />}
                  #{row.rank}
                </Badge>
              </CardTitle>
              <CardDescription>
                {"level" in row
                  ? `เลเวล ${row.level}`
                  : "เวลารวมในห้องเสียง"}
              </CardDescription>
            </CardHeader>
            <CardContent className="text-xl font-semibold tabular-nums">
              {"totalXp" in row
                ? `${formatInteger(row.totalXp)} XP`
                : formatVoiceDuration(row.totalSeconds)}
            </CardContent>
          </Card>
        ))}
      </div>
    </section>
  );
}

export function LeaderboardBoard(props: LeaderboardBoardProps) {
  const { kind, data, channelId, searchQuery } = props;
  const firstRow = data.totalRows === 0
    ? 0
    : (data.page - 1) * data.pageSize + 1;
  const lastRow = Math.min(data.page * data.pageSize, data.totalRows);

  return (
    <>
      <Podium {...props} />

      <Card>
        <CardHeader>
          <CardTitle>
            {kind === "xp" ? "อันดับ XP ทั้งหมด" : "อันดับเวลาในห้องเสียง"}
          </CardTitle>
          <CardDescription>
            {data.totalRows > 0
              ? `แสดง ${firstRow}–${lastRow} จาก ${formatInteger(String(data.totalRows))} คน`
              : searchQuery
                ? "ไม่พบสมาชิกที่ตรงกับคำค้นหานี้"
                : "ยังไม่มีข้อมูลในขอบเขตนี้"}
          </CardDescription>
        </CardHeader>
        <CardContent className="px-0">
          <Table>
            <TableCaption>
              {kind === "xp"
                ? "ตารางอันดับจาก XP รวมของสมาชิกเลเวล 1 ขึ้นไป"
                : "ตารางอันดับจากเวลารวมในห้องเสียงและห้องเวทีปัจจุบัน"}
            </TableCaption>
            <TableHeader>
              <TableRow>
                <TableHead className="pl-6">อันดับ</TableHead>
                <TableHead>สมาชิก</TableHead>
                {kind === "xp" && <TableHead>เลเวล</TableHead>}
                <TableHead className="pr-6 text-right">
                  {kind === "xp" ? "XP รวม" : "เวลารวม"}
                </TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {data.rows.map((row) => (
                <TableRow key={row.userId}>
                  <TableCell className="pl-6">
                    <Badge variant={rankVariant(row.rank)}>#{row.rank}</Badge>
                  </TableCell>
                  <TableCell>
                    <Identity {...row} />
                  </TableCell>
                  {"level" in row && (
                    <TableCell className="tabular-nums">{row.level}</TableCell>
                  )}
                  <TableCell className="pr-6 text-right font-medium tabular-nums">
                    {"totalXp" in row
                      ? formatInteger(row.totalXp)
                      : formatVoiceDuration(row.totalSeconds)}
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </CardContent>
        <CardFooter>
          <LeaderboardPagination
            path={`/leaderboard/${kind}`}
            page={data.page}
            totalPages={data.totalPages}
            channelId={channelId}
            searchQuery={searchQuery}
          />
        </CardFooter>
      </Card>
    </>
  );
}