import { Form, Link } from "react-router";
import { useState } from "react";
import type { Route } from "./+types/admin.sports-seasons.$id.events";

import { loader, action } from "./admin.sports-seasons.$id.events.server";
import { localDateTimeToUtcIso } from "~/lib/date-utils";
import { Button } from "~/components/ui/button";
import { Input } from "~/components/ui/input";
import { Label } from "~/components/ui/label";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "~/components/ui/card";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "~/components/ui/select";
import { Badge } from "~/components/ui/badge";
import { Textarea } from "~/components/ui/textarea";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
  AlertDialogTrigger,
} from "~/components/ui/alert-dialog";
import { Calendar, Trophy, ArrowLeft, Trash2, ListPlus } from "lucide-react";
import { format, parseISO } from "date-fns";
import { QualifyingPointsStandings } from "~/components/scoring/QualifyingPointsStandings";
import { getEventTypeLabel } from "~/models/scoring-event";

export function meta({ data }: Route.MetaArgs): Route.MetaDescriptors {
  return [{ title: `Events — ${data?.sportsSeason?.name ?? "Sports Season"} - Brackt Admin` }];
}

export { loader, action };

function getStatusBadge(isComplete: boolean, eventType: string, eventDate?: string | null, eventStartsAt?: Date | string | null) {
  if (isComplete) {
    return (
      <Badge variant="default" className="bg-emerald-500">
        Completed
      </Badge>
    );
  }
  if (eventType === "schedule_event") {
    const isPast = eventStartsAt
      ? new Date(eventStartsAt) < new Date()
      : eventDate !== null && eventDate !== undefined && eventDate < new Date().toISOString().split("T")[0];
    return isPast ? (
      <Badge variant="outline" className="text-muted-foreground">Results Pending</Badge>
    ) : (
      <Badge variant="outline">Upcoming</Badge>
    );
  }
  return <Badge variant="secondary">In Progress</Badge>;
}

export default function SportsSeasonEvents({
  loaderData,
  actionData,
}: Route.ComponentProps) {
  const { sportsSeason, events, qpStandings, scoringRules } = loaderData;

  const [createEventStartsAt, setCreateEventStartsAt] = useState("");

  const defaultEventType =
    sportsSeason.scoringPattern === "qualifying_points"
      ? "major_tournament"
      : sportsSeason.scoringPattern === "season_standings"
        ? "schedule_event"
        : "playoff_game";

  return (
    <div className="p-8">
      <div className="max-w-4xl">
        <div className="mb-6">
          <Button variant="ghost" size="sm" asChild className="mb-2">
            <Link to={`/admin/sports-seasons/${sportsSeason.id}`}>
              <ArrowLeft className="mr-2 h-4 w-4" />
              Back to Sports Season
            </Link>
          </Button>
          <h1 className="text-3xl font-bold">Scoring Events</h1>
          <p className="text-muted-foreground mt-1">
            {sportsSeason.sport.name} - {sportsSeason.name}
          </p>
          {sportsSeason.scoringPattern === "qualifying_points" && (
            <div className="mt-2">
              <Badge variant="outline" className="bg-amber-50 text-amber-700 border-amber-300 dark:bg-amber-950 dark:text-amber-300">
                Qualifying Points Mode
              </Badge>
            </div>
          )}
        </div>

        <div className="space-y-6">
          {/* Success/Error Messages */}
          {actionData?.error && (
            <div className="bg-destructive/15 text-destructive px-4 py-3 rounded-md text-sm">
              {actionData.error}
            </div>
          )}

          {actionData?.success && (
            <div className="bg-emerald-500/15 text-emerald-400 px-4 py-3 rounded-md text-sm">
              {actionData.success}
            </div>
          )}

          {/* QP Standings for qualifying points sports */}
          {sportsSeason.scoringPattern === "qualifying_points" && qpStandings && (
            <QualifyingPointsStandings
              standings={qpStandings}
              scoringRules={scoringRules}
              isFinalized={sportsSeason.qualifyingPointsFinalized || false}
              totalMajors={sportsSeason.totalMajors}
              majorsCompleted={sportsSeason.majorsCompleted}
              canFinalize={
                sportsSeason.totalMajors !== null &&
                sportsSeason.majorsCompleted >= sportsSeason.totalMajors &&
                !sportsSeason.qualifyingPointsFinalized
              }
            />
          )}

          {/* Create New Event Card */}
          <Card>
            <CardHeader>
              <CardTitle>Create New Event</CardTitle>
              <CardDescription>
                Add a new scoring event (bracket, tournament, standings, etc.)
              </CardDescription>
            </CardHeader>
            <CardContent>
              <Form method="post" className="space-y-4">
                <div className="space-y-2">
                  <Label htmlFor="name">Event Name</Label>
                  <Input
                    id="name"
                    name="name"
                    type="text"
                    placeholder="e.g., Super Bowl, Round 1, Game 3"
                    required
                  />
                </div>

                <div className="space-y-2">
                  <Label htmlFor="eventType">Event Type</Label>
                  <Select
                    name="eventType"
                    defaultValue={defaultEventType}
                    required
                  >
                    <SelectTrigger id="eventType">
                      <SelectValue />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectItem value="schedule_event">Non-Scoring</SelectItem>
                      <SelectItem value="major_tournament">Major Tournament</SelectItem>
                      <SelectItem value="playoff_game">Bracket</SelectItem>
                    </SelectContent>
                  </Select>
                  {sportsSeason.scoringPattern === "qualifying_points" && (
                    <p className="text-sm text-muted-foreground">
                      Major Tournament events will automatically award qualifying points when completed.
                    </p>
                  )}
                </div>

                <div className="space-y-2">
                  <Label htmlFor="eventStartsAtLocal">Event Date & Time (Optional)</Label>
                  <Input
                    id="eventStartsAtLocal"
                    type="datetime-local"
                    onChange={(e) =>
                      setCreateEventStartsAt(localDateTimeToUtcIso(e.target.value) ?? "")
                    }
                  />
                  <input type="hidden" name="eventStartsAt" value={createEventStartsAt} />
                </div>

                {actionData?.error && (
                  <div className="bg-destructive/15 text-destructive px-4 py-3 rounded-md text-sm">
                    {actionData.error}
                  </div>
                )}

                <Button type="submit" className="w-full">
                  <Trophy className="mr-2 h-4 w-4" />
                  Create Event
                </Button>
              </Form>
            </CardContent>
          </Card>

          {/* Bulk Create Card */}
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <ListPlus className="h-5 w-5" />
                Bulk Import Events
              </CardTitle>
              <CardDescription>
                Paste a schedule — one event per line. Format:{" "}
                <code className="text-xs bg-muted px-1 rounded">
                  Event Name, YYYY-MM-DD[, HH:MM]
                </code>{" "}
                (date and time are optional; time is UTC).
              </CardDescription>
            </CardHeader>
            <CardContent>
              <Form method="post" className="space-y-4">
                <input type="hidden" name="intent" value="bulk-create" />
                <div className="space-y-2">
                  <Label htmlFor="bulkEventType">Event Type</Label>
                  <Select name="bulkEventType" defaultValue={defaultEventType}>
                    <SelectTrigger id="bulkEventType">
                      <SelectValue />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectItem value="schedule_event">Non-Scoring</SelectItem>
                      <SelectItem value="major_tournament">Major Tournament</SelectItem>
                      <SelectItem value="playoff_game">Bracket</SelectItem>
                    </SelectContent>
                  </Select>
                </div>
                <div className="space-y-2">
                  <Label htmlFor="bulkEvents">Events</Label>
                  <Textarea
                    id="bulkEvents"
                    name="bulkEvents"
                    rows={6}
                    placeholder={"Bahrain Grand Prix, 2025-03-02, 15:00\nSaudi Arabian Grand Prix, 2025-03-09, 18:00\nAustralian Grand Prix, 2025-03-23"}
                  />
                </div>
                <Button type="submit" variant="outline" className="w-full">
                  <ListPlus className="mr-2 h-4 w-4" />
                  Import Events
                </Button>
              </Form>
            </CardContent>
          </Card>

          {/* Events List */}
          <Card>
            <CardHeader>
              <CardTitle>Events</CardTitle>
              <CardDescription>
                {events.length} {events.length === 1 ? "event" : "events"}
              </CardDescription>
            </CardHeader>
            <CardContent>
              {events.length === 0 ? (
                <p className="text-sm text-muted-foreground">
                  No events created yet. Create your first event above.
                </p>
              ) : (
                <div className="space-y-3">
                  {events.map((event: { id: string; name: string; eventType: string; eventDate?: string | null; eventStartsAt?: Date | string | null; isComplete: boolean }) => (
                    <Card key={event.id} className="hover:border-primary/50 transition-colors">
                      <CardContent className="pt-6">
                        <div className="flex items-start justify-between gap-4">
                          <Link
                            to={`/admin/sports-seasons/${sportsSeason.id}/events/${event.id}`}
                            className="flex-1 cursor-pointer"
                          >
                            <div className="flex items-center gap-2 mb-1">
                              <h3 className="font-semibold">{event.name}</h3>
                              {getStatusBadge(event.isComplete, event.eventType, event.eventDate, event.eventStartsAt)}
                            </div>
                            <div className="flex items-center gap-4 text-sm text-muted-foreground">
                              <span>
                                {getEventTypeLabel(event.eventType)}
                              </span>
                              {(event.eventDate || event.eventStartsAt) && (
                                <span className="flex items-center gap-1">
                                  <Calendar className="h-3 w-3" />
                                  <span suppressHydrationWarning>
                                    {format(
                                      event.eventStartsAt
                                        ? new Date(event.eventStartsAt)
                                        : parseISO(event.eventDate ?? ""),
                                      "MMM d, yyyy"
                                    )}
                                  </span>
                                  {event.eventStartsAt && (
                                    <span className="text-muted-foreground/70" suppressHydrationWarning>
                                      · {format(new Date(event.eventStartsAt), "h:mm a")}
                                    </span>
                                  )}
                                </span>
                              )}
                            </div>
                          </Link>
                          <AlertDialog>
                            <AlertDialogTrigger asChild>
                              <Button
                                size="sm"
                                variant="ghost"
                                className="text-destructive hover:text-destructive shrink-0"
                              >
                                <Trash2 className="h-4 w-4" />
                              </Button>
                            </AlertDialogTrigger>
                            <AlertDialogContent>
                              <AlertDialogHeader>
                                <AlertDialogTitle>Delete "{event.name}"?</AlertDialogTitle>
                                <AlertDialogDescription>
                                  This will also delete all results for this event. This action cannot be undone.
                                </AlertDialogDescription>
                              </AlertDialogHeader>
                              <AlertDialogFooter>
                                <AlertDialogCancel>Cancel</AlertDialogCancel>
                                <Form method="post">
                                  <input type="hidden" name="intent" value="delete-event" />
                                  <input type="hidden" name="eventId" value={event.id} />
                                  <AlertDialogAction type="submit" className="bg-destructive text-destructive-foreground hover:bg-destructive/90">
                                    Delete
                                  </AlertDialogAction>
                                </Form>
                              </AlertDialogFooter>
                            </AlertDialogContent>
                          </AlertDialog>
                        </div>
                      </CardContent>
                    </Card>
                  ))}
                </div>
              )}
            </CardContent>
          </Card>
        </div>
      </div>
    </div>
  );
}