"use client";

import { useCallback, useState } from "react";
import { useRouter } from "next/navigation";
import { api } from "@/lib/api/client";
import { GlassCard } from "@/components/ui/glass-card";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { TeamIconPicker } from "@/components/teams/team-icon-picker";
import { TeamIcon } from "@/components/teams/TeamIcon";
import { ConfirmDialog } from "@/components/ui/confirm-dialog";
import { Trash2 } from "lucide-react";

export type DraftTeam = {
  id: string;
  name: string;
  nickname: string | null;
  icon: string | null;
  logo_path: string | null;
};

export function CompetitionDraftPanel({
  competitionId,
  initialTeams,
}: {
  competitionId: string;
  initialTeams: DraftTeam[];
}) {
  const router = useRouter();
  const [teams, setTeams] = useState<DraftTeam[]>(initialTeams);
  const [name, setName] = useState("");
  const [nickname, setNickname] = useState("");
  const [icon, setIcon] = useState("shield");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [confirmAction, setConfirmAction] = useState<
    | { type: "activate" }
    | { type: "fixtures" }
    | { type: "delete-team"; team: DraftTeam }
    | null
  >(null);

  const refreshTeams = useCallback(async () => {
    const list = (await api.competitions.listTeams(competitionId)) as DraftTeam[];
    setTeams(list);
  }, [competitionId]);

  async function run(fn: () => Promise<void>, refresh = true) {
    setLoading(true);
    setError(null);
    try {
      await fn();
      if (refresh) {
        await refreshTeams();
        router.refresh();
      }
    } catch (e) {
      setError(e instanceof Error ? e.message : "Error");
    } finally {
      setLoading(false);
      setConfirmAction(null);
    }
  }

  async function handleAddTeam(e: React.FormEvent) {
    e.preventDefault();
    if (loading) return;
    const trimmed = name.trim();
    if (!trimmed) return;

    setLoading(true);
    setError(null);
    try {
      const created = (await api.competitions.createTeam(competitionId, {
        name: trimmed,
        nickname: nickname.trim() || undefined,
        icon,
      })) as DraftTeam;
      setTeams((prev) => [...prev, created]);
      setName("");
      setNickname("");
      setIcon("shield");
      router.refresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : "Failed to add team");
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="space-y-4">
      {error && <p className="text-sm text-red-400">{error}</p>}

      <div className="flex flex-wrap gap-2">
        <Button
          variant="secondary"
          disabled={loading}
          onClick={() => setConfirmAction({ type: "activate" })}
        >
          Activate competition
        </Button>
        <Button
          disabled={loading}
          onClick={() => setConfirmAction({ type: "fixtures" })}
        >
          Generate fixtures
        </Button>
      </div>

      <GlassCard title="Add team">
        <form onSubmit={handleAddTeam} className="space-y-4">
          <div className="grid gap-4 sm:grid-cols-2">
            <div>
              <Label htmlFor="team_name">Team name</Label>
              <Input
                id="team_name"
                value={name}
                onChange={(e) => setName(e.target.value)}
                placeholder="FC Example"
                required
                className="mt-1"
              />
            </div>
            <div>
              <Label htmlFor="team_nickname">Nickname</Label>
              <Input
                id="team_nickname"
                value={nickname}
                onChange={(e) => setNickname(e.target.value)}
                placeholder="The Blues"
                className="mt-1"
              />
            </div>
          </div>
          <div>
            <Label className="mb-2 block">Team icon</Label>
            <TeamIconPicker value={icon} onChange={setIcon} />
          </div>
          <Button type="submit" disabled={loading}>
            {loading ? "Adding…" : "Add team"}
          </Button>
        </form>
      </GlassCard>

      <GlassCard title={`Teams (${teams.length})`}>
        {teams.length === 0 ? (
          <p className="text-sm text-[var(--color-muted)]">
            No teams yet. Add your first team above.
          </p>
        ) : (
          <div className="overflow-x-auto">
            <table className="w-full text-sm">
              <thead>
                <tr className="border-b border-white/10 text-left text-[var(--color-muted)]">
                  <th className="pb-3 pr-4">Team</th>
                  <th className="pb-3 pr-4">Nickname</th>
                  <th className="pb-3 w-16" />
                </tr>
              </thead>
              <tbody>
                {teams.map((t) => (
                  <tr key={t.id} className="border-b border-white/5">
                    <td className="py-3 pr-4">
                      <div className="flex items-center gap-2 font-medium">
                        <TeamIcon
                          icon={t.icon}
                          className="h-5 w-5 text-cyan-400"
                        />
                        {t.name}
                      </div>
                    </td>
                    <td className="py-3 pr-4 text-[var(--color-muted)]">
                      {t.nickname || "—"}
                    </td>
                    <td className="py-3 text-right">
                      <Button
                        type="button"
                        variant="ghost"
                        size="sm"
                        disabled={loading}
                        onClick={() =>
                          setConfirmAction({ type: "delete-team", team: t })
                        }
                      >
                        <Trash2 className="h-4 w-4 text-red-400" />
                      </Button>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </GlassCard>

      <ConfirmDialog
        open={confirmAction?.type === "activate"}
        onOpenChange={(o) => !o && setConfirmAction(null)}
        title="Activate competition?"
        description="This snapshots league rules and opens the season. Teams cannot be added casually after activation without master access."
        confirmLabel="Activate"
        loading={loading}
        variant="primary"
        onConfirm={() =>
          run(() => api.competitions.activate(competitionId), true)
        }
      />

      <ConfirmDialog
        open={confirmAction?.type === "fixtures"}
        onOpenChange={(o) => !o && setConfirmAction(null)}
        title="Generate fixtures?"
        description="This creates all matches for every team. Make sure your team list is final."
        confirmLabel="Generate"
        loading={loading}
        variant="primary"
        onConfirm={() =>
          run(() => api.competitions.generateFixtures(competitionId), true)
        }
      />

      <ConfirmDialog
        open={confirmAction?.type === "delete-team"}
        onOpenChange={(o) => !o && setConfirmAction(null)}
        title="Remove team?"
        description={`Delete "${confirmAction?.type === "delete-team" ? confirmAction.team.name : ""}" from this competition? This cannot be undone.`}
        confirmLabel="Delete team"
        loading={loading}
        onConfirm={() => {
          if (confirmAction?.type !== "delete-team") return;
          const id = confirmAction.team.id;
          return run(async () => {
            await api.teams.delete(id);
            setTeams((prev) => prev.filter((t) => t.id !== id));
          }, true);
        }}
      />
    </div>
  );
}