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

import { loader, action } from "./admin.sports-seasons.$id.events.$eventId.server";
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 { ArrowLeft, Trophy, CheckCircle2, Pencil, Trash2, Brackets, Save } from "lucide-react";
import { getEventTypeLabel } from "~/models/scoring-event";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "~/components/ui/table";
import { useState, useEffect } from "react";
import { format } from "date-fns";
import { localDateTimeToUtcIso } from "~/lib/date-utils";

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

export { loader, action };

function EditEventCard({ event }: { event: { name: string; eventDate?: string | null; eventStartsAt?: Date | string | null } }) {
  // Keep the UTC ISO value for the hidden field (safe for SSR)
  const [eventStartsAtUtc, setEventStartsAtUtc] = useState(
    event.eventStartsAt ? new Date(event.eventStartsAt).toISOString() : ""
  );
  // Compute the display value client-side only — format() uses the runtime timezone,
  // so running it on the server would pre-fill the wrong time for non-UTC admins.
  const [displayValue, setDisplayValue] = useState("");
  useEffect(() => {
    if (event.eventStartsAt) {
      setDisplayValue(format(new Date(event.eventStartsAt), "yyyy-MM-dd'T'HH:mm"));
    }
  }, [event.eventStartsAt]);

  return (
    <Card>
      <CardHeader>
        <CardTitle>Edit Event</CardTitle>
      </CardHeader>
      <CardContent>
        <Form method="post" className="space-y-4">
          <input type="hidden" name="intent" value="update-event" />
          <div className="space-y-2">
            <Label htmlFor="name">Name</Label>
            <Input id="name" name="name" defaultValue={event.name} required />
          </div>
          <div className="space-y-2">
            <Label htmlFor="eventStartsAtLocal">Event Date & Time (Optional)</Label>
            <Input
              id="eventStartsAtLocal"
              type="datetime-local"
              value={displayValue}
              onChange={(e) => {
                setDisplayValue(e.target.value);
                setEventStartsAtUtc(localDateTimeToUtcIso(e.target.value) ?? "");
              }}
            />
            <input type="hidden" name="eventStartsAt" value={eventStartsAtUtc} />
          </div>
          <Button type="submit" variant="outline">
            <Save className="mr-2 h-4 w-4" />
            Save Changes
          </Button>
        </Form>
      </CardContent>
    </Card>
  );
}

export default function EventResults({
  loaderData,
  actionData,
}: Route.ComponentProps) {
  const { sportsSeason, event, participants, results, participantResults, seasonResults } = loaderData;
  const [hasChanges, setHasChanges] = useState(false);

  // Create a map of participants with results for easy lookup
  const participantResultsMap = new Map(
    results.map((r: { participant: { id: string } }) => [r.participant.id, r])
  );

  // Get participants without results
  const participantsWithoutResults = participants.filter(
    (p: { id: string }) => !participantResultsMap.has(p.id)
  );

  // Sort results by placement
  const sortedResults = [...results].toSorted((a, b) => (a.placement || 999) - (b.placement || 999));

  // Create a map of season results for easy lookup
  const seasonResultsMap = seasonResults
    ? new Map(
        seasonResults.map((r: { participantId: string }) => [r.participantId, r])
      )
    : new Map();

  // Non-scoring events have a simple view — edit name/date and toggle updated status
  if (event.eventType === "schedule_event") {
    const isPast = event.eventStartsAt
      ? new Date(event.eventStartsAt) < new Date()
      : event.eventDate !== null && event.eventDate !== undefined && String(event.eventDate).slice(0, 10) < new Date().toISOString().split("T")[0];

    return (
      <div className="p-8">
        <div className="max-w-2xl">
          <div className="mb-6">
            <Button variant="ghost" size="sm" asChild className="mb-2">
              <Link to={`/admin/sports-seasons/${sportsSeason.id}/events`}>
                <ArrowLeft className="mr-2 h-4 w-4" />
                Back to Events
              </Link>
            </Button>
            <div className="flex items-center justify-between">
              <div>
                <h1 className="text-3xl font-bold">{event.name}</h1>
                <p className="text-muted-foreground mt-1">
                  {sportsSeason.sport.name} — {sportsSeason.name} • Non-Scoring
                </p>
              </div>
              {event.isComplete ? (
                <Badge variant="default" className="bg-emerald-500">
                  <CheckCircle2 className="mr-1 h-3 w-3" />
                  Updated
                </Badge>
              ) : (
                <Badge variant="outline">
                  {isPast ? "Results Pending" : "Upcoming"}
                </Badge>
              )}
            </div>
          </div>

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

          <div className="space-y-4">
            <EditEventCard event={event} />

            <Card>
              <CardHeader>
                <CardTitle>Scoring Status</CardTitle>
                <CardDescription>
                  {event.isComplete
                    ? "This event has been noted as updated in standings."
                    : isPast
                      ? "This event has passed — mark it once standings have been updated."
                      : "This event hasn't occurred yet."}
                </CardDescription>
              </CardHeader>
              <CardContent>
                {event.isComplete ? (
                  <Form method="post">
                    <input type="hidden" name="intent" value="uncomplete" />
                    <Button type="submit" variant="outline" size="sm">
                      Mark as Not Updated
                    </Button>
                  </Form>
                ) : (
                  <Form method="post">
                    <input type="hidden" name="intent" value="complete" />
                    <Button type="submit" size="sm">
                      <CheckCircle2 className="mr-2 h-4 w-4" />
                      Mark as Updated
                    </Button>
                  </Form>
                )}
              </CardContent>
            </Card>
          </div>
        </div>
      </div>
    );
  }

  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}/events`}>
              <ArrowLeft className="mr-2 h-4 w-4" />
              Back to Events
            </Link>
          </Button>
          <div className="flex items-center justify-between">
            <div>
              <h1 className="text-3xl font-bold">{event.name}</h1>
              <p className="text-muted-foreground mt-1">
                {sportsSeason.sport.name} - {sportsSeason.name} •{" "}
                {getEventTypeLabel(event.eventType)}
                {event.playoffRound && ` • ${event.playoffRound}`}
              </p>
            </div>
            <div className="flex items-center gap-2">
              {event.eventType === "playoff_game" && (
                <Button variant="outline" asChild>
                  <Link to={`/admin/sports-seasons/${sportsSeason.id}/events/${event.id}/bracket`}>
                    <Brackets className="mr-2 h-4 w-4" />
                    Manage Bracket
                  </Link>
                </Button>
              )}
              {event.isComplete ? (
                <Badge variant="default" className="bg-emerald-500">
                  <CheckCircle2 className="mr-1 h-3 w-3" />
                  Completed
                </Badge>
              ) : (
                <Badge variant="secondary">In Progress</Badge>
              )}
              {event.isQualifyingEvent && (
                <Badge variant="outline" className="border-amber-500 text-amber-600">
                  Qualifying Event
                </Badge>
              )}
            </div>
          </div>
        </div>

        <div className="space-y-6">
          {/* Edit Event Name/Date */}
          <EditEventCard event={event} />

          {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>
          )}

          {/* Debug info and manual QP processing for completed major tournaments */}
          {event.isComplete && event.eventType === "major_tournament" && (
            <Card className="border-electric/30">
              <CardHeader>
                <CardTitle className="text-electric">
                  Event Processing Status
                </CardTitle>
                <CardDescription>
                  <div className="space-y-1 font-mono text-xs">
                    <div>Event Type: {event.eventType}</div>
                    <div>Is Qualifying Event: {event.isQualifyingEvent ? 'Yes' : 'No'}</div>
                    <div>Sports Season Pattern: {sportsSeason.scoringPattern || 'not set'}</div>
                    <div>Results Count: {results.length}</div>
                  </div>
                </CardDescription>
              </CardHeader>
              <CardContent>
                <div className="space-y-3">
                  {!event.isQualifyingEvent && (
                    <div className="space-y-2">
                      <p className="text-sm text-muted-foreground">
                        This event needs to be marked as a qualifying event to award qualifying points.
                      </p>
                      <Form method="post">
                        <input type="hidden" name="intent" value="mark-qualifying" />
                        <Button type="submit" variant="outline">
                          Mark as Qualifying Event
                        </Button>
                      </Form>
                    </div>
                  )}
                  {event.isQualifyingEvent && (
                    <Form method="post">
                      <input type="hidden" name="intent" value="process-qp" />
                      <Button type="submit" className="bg-blue-600 hover:bg-blue-700">
                        <Trophy className="mr-2 h-4 w-4" />
                        Process/Reprocess Qualifying Points
                      </Button>
                    </Form>
                  )}
                </div>
              </CardContent>
            </Card>
          )}

          {/* Season Standings Table for final_standings events */}
          {event.eventType === "final_standings" && !event.isComplete && (
            <>
              <Card>
                <CardHeader>
                  <CardTitle>Season Standings Tracker</CardTitle>
                  <CardDescription>
                    Enter championship points for each participant. Positions are automatically calculated based on points (highest = 1st).
                    When the season ends, mark this event as complete to assign fantasy points to the top 8.
                  </CardDescription>
                </CardHeader>
                <CardContent>
                  <Form method="post" className="space-y-4">
                    <input type="hidden" name="intent" value="update-standings" />

                    <Table>
                      <TableHeader>
                        <TableRow>
                          <TableHead>Participant</TableHead>
                          <TableHead className="text-right">Championship Points</TableHead>
                        </TableRow>
                      </TableHeader>
                      <TableBody>
                        {participants.map((participant: { id: string; name: string }) => {
                          const result = seasonResultsMap.get(participant.id);
                          const currentPoints = result?.currentPoints || "";

                          return (
                            <TableRow key={participant.id}>
                              <TableCell className="font-medium">
                                {participant.name}
                              </TableCell>
                              <TableCell className="text-right">
                                <Input
                                  type="number"
                                  name={`points-${participant.id}`}
                                  defaultValue={currentPoints}
                                  placeholder="e.g., 250"
                                  step="0.01"
                                  min="0"
                                  className="w-32 ml-auto"
                                  onChange={() => setHasChanges(true)}
                                />
                              </TableCell>
                            </TableRow>
                          );
                        })}
                      </TableBody>
                    </Table>

                    <div className="flex justify-between items-center pt-4">
                      <p className="text-sm text-muted-foreground">
                        {hasChanges
                          ? "You have unsaved changes"
                          : "Update standings after each race/event during the season"}
                      </p>
                      <Button type="submit">
                        <Save className="mr-2 h-4 w-4" />
                        Save Standings
                      </Button>
                    </div>
                  </Form>
                </CardContent>
              </Card>

              {/* Complete Season Button */}
              <Card className="border-amber-accent/30">
                <CardHeader>
                  <CardTitle className="text-amber-accent">
                    <Trophy className="inline mr-2 h-5 w-5" />
                    Finalize Season
                  </CardTitle>
                  <CardDescription>
                    When the season is complete, mark this event as complete to:
                    <ul className="list-disc list-inside mt-2 space-y-1">
                      <li>Convert the top 8 participants (by position) to fantasy placements 1-8</li>
                      <li>Award fantasy points based on league scoring rules</li>
                      <li>Update all league standings</li>
                    </ul>
                    <p className="mt-2 font-semibold text-orange-600 dark:text-orange-400">
                      ⚠️ Make sure all standings are saved before completing
                    </p>
                  </CardDescription>
                </CardHeader>
                <CardContent>
                  <Form method="post">
                    <input type="hidden" name="intent" value="complete" />
                    <Button type="submit" variant="default" className="bg-orange-600 hover:bg-orange-700">
                      <CheckCircle2 className="mr-2 h-4 w-4" />
                      Mark Season Complete & Assign Fantasy Points
                    </Button>
                  </Form>
                </CardContent>
              </Card>
            </>
          )}

          {/* Regular Result Entry for other event types */}
          {event.eventType !== "final_standings" && event.eventType !== "playoff_game" && !event.isComplete && (
            <Card>
              <CardHeader>
                <CardTitle>Add Result</CardTitle>
                <CardDescription>
                  Enter the placement for a participant in this event
                </CardDescription>
              </CardHeader>
              <CardContent>
                <Form method="post" className="space-y-4">
                  <input type="hidden" name="intent" value="add-result" />

                  <div className="grid grid-cols-2 gap-4">
                    <div className="space-y-2">
                      <Label htmlFor="participantId">Participant</Label>
                      <Select name="participantId" required>
                        <SelectTrigger id="participantId">
                          <SelectValue placeholder="Select participant" />
                        </SelectTrigger>
                        <SelectContent>
                          {participantsWithoutResults.length === 0 ? (
                            <div className="p-2 text-sm text-muted-foreground">
                              All participants have results
                            </div>
                          ) : (
                            participantsWithoutResults.map((participant: { id: string; name: string }) => (
                              <SelectItem
                                key={participant.id}
                                value={participant.id}
                              >
                                {participant.name}
                              </SelectItem>
                            ))
                          )}
                        </SelectContent>
                      </Select>
                    </div>

                    <div className="space-y-2">
                      <Label htmlFor="placement">Placement</Label>
                      <Input
                        id="placement"
                        name="placement"
                        type="number"
                        min="1"
                        max="100"
                        placeholder="e.g., 1"
                        required
                      />
                    </div>
                  </div>

                  <Button
                    type="submit"
                    className="w-full"
                    disabled={participantsWithoutResults.length === 0}
                  >
                    <Trophy className="mr-2 h-4 w-4" />
                    Add Result
                  </Button>
                </Form>
              </CardContent>
            </Card>
          )}

          {/* Manual QP Processing Button (for existing events) */}
          {event.isComplete &&
            event.eventType === "major_tournament" &&
            sportsSeason.scoringPattern === "qualifying_points" &&
            results.length > 0 && (
              <Card className="border-amber-200 dark:border-amber-800">
                <CardHeader>
                  <CardTitle className="text-amber-600 dark:text-amber-400">
                    Process Qualifying Points
                  </CardTitle>
                  <CardDescription>
                    This event is complete but qualifying points haven't been awarded yet.
                    Click below to award QP based on the results entered.
                  </CardDescription>
                </CardHeader>
                <CardContent>
                  <Form method="post">
                    <input type="hidden" name="intent" value="process-qp" />
                    <Button type="submit" className="bg-amber-600 hover:bg-amber-700">
                      <Trophy className="mr-2 h-4 w-4" />
                      Award Qualifying Points Now
                    </Button>
                  </Form>
                </CardContent>
              </Card>
            )}

          {/* Current Results - Hide for playoff events since they use the bracket */}
          {event.eventType !== "playoff_game" && (
            <Card>
              <CardHeader>
                <div className="flex items-center justify-between">
                  <div>
                    <CardTitle>Results</CardTitle>
                    <CardDescription>
                      {results.length} of {participants.length} participants have
                      results
                    </CardDescription>
                  </div>
                  {!event.isComplete && results.length > 0 && event.eventType !== "final_standings" && (
                    <Form method="post">
                      <input type="hidden" name="intent" value="complete" />
                      <Button type="submit" variant="outline" size="sm">
                        <CheckCircle2 className="mr-2 h-4 w-4" />
                        Mark Event Complete
                      </Button>
                    </Form>
                  )}
                </div>
              </CardHeader>
              <CardContent>
                {sortedResults.length === 0 ? (
                  <p className="text-sm text-muted-foreground">
                    No results added yet. Add results using the form above.
                  </p>
                ) : (
                <Table>
                  <TableHeader>
                    <TableRow>
                      <TableHead className="w-24">Placement</TableHead>
                      <TableHead>Participant</TableHead>
                      {event.isQualifyingEvent && event.isComplete && (
                        <TableHead className="w-32 text-right">QP Awarded</TableHead>
                      )}
                      {!event.isComplete && <TableHead className="w-32">Actions</TableHead>}
                    </TableRow>
                  </TableHeader>
                  <TableBody>
                    {sortedResults.map((result) => (
                      <TableRow key={result.id}>
                        <TableCell>
                          <div className="flex items-center gap-2">
                            {result.placement === 1 && (
                              <span className="text-xl">🥇</span>
                            )}
                            {result.placement === 2 && (
                              <span className="text-xl">🥈</span>
                            )}
                            {result.placement === 3 && (
                              <span className="text-xl">🥉</span>
                            )}
                            <span className="font-semibold">
                              {result.placement}
                            </span>
                          </div>
                        </TableCell>
                        <TableCell>{result.participant.name}</TableCell>
                        {event.isQualifyingEvent && event.isComplete && (
                          <TableCell className="text-right">
                            {result.qualifyingPointsAwarded ? (
                              <span className="font-semibold text-amber-600 dark:text-amber-400">
                                {parseFloat(result.qualifyingPointsAwarded).toFixed(2)} QP
                              </span>
                            ) : (
                              <span className="text-muted-foreground">0 QP</span>
                            )}
                          </TableCell>
                        )}
                        {!event.isComplete && (
                          <TableCell>
                            <div className="flex items-center gap-2">
                              <Form method="post" className="inline">
                                <input type="hidden" name="intent" value="update-result" />
                                <input type="hidden" name="resultId" value={result.id} />
                                <Input
                                  type="number"
                                  name="placement"
                                  defaultValue={result.placement || ""}
                                  min="1"
                                  max="100"
                                  className="w-16 h-8 text-sm"
                                  onKeyDown={(e) => {
                                    if (e.key === 'Enter') {
                                      e.currentTarget.form?.requestSubmit();
                                    }
                                  }}
                                />
                                <Button type="submit" size="sm" variant="ghost" className="h-8 w-8 p-0">
                                  <Pencil className="h-3 w-3" />
                                </Button>
                              </Form>
                              <Form method="post" className="inline">
                                <input type="hidden" name="intent" value="delete-result" />
                                <input type="hidden" name="resultId" value={result.id} />
                                <Button
                                  type="submit"
                                  size="sm"
                                  variant="ghost"
                                  className="h-8 w-8 p-0 text-destructive hover:text-destructive"
                                  onClick={(e) => {
                                    if (!confirm(`Delete result for ${result.participant.name}?`)) {
                                      e.preventDefault();
                                    }
                                  }}
                                >
                                  <Trash2 className="h-3 w-3" />
                                </Button>
                              </Form>
                            </div>
                          </TableCell>
                        )}
                      </TableRow>
                    ))}
                  </TableBody>
                </Table>
              )}
            </CardContent>
          </Card>
          )}

          {/* Bracket Explanation Card for Playoff Events */}
          {event.eventType === "playoff_game" && !participantResults?.length && (
            <Card className="border-electric/30 bg-electric/10">
              <CardHeader>
                <CardTitle className="text-electric">
                  <Brackets className="inline mr-2 h-5 w-5" />
                  Bracket Event
                </CardTitle>
                <CardDescription className="text-electric">
                  This is a bracket/playoff event. Results are managed through the bracket interface.
                </CardDescription>
              </CardHeader>
              <CardContent>
                <div className="space-y-3 text-sm">
                  <p>To complete this event:</p>
                  <ol className="list-decimal list-inside space-y-2 ml-2">
                    <li>Click "Manage Bracket" above to set match winners</li>
                    <li>Once all matches are complete, click "Finalize Bracket"</li>
                    <li>Fantasy placements and points will appear below automatically</li>
                  </ol>
                  <div className="pt-3">
                    <Button variant="outline" asChild>
                      <Link to={`/admin/sports-seasons/${sportsSeason.id}/events/${event.id}/bracket`}>
                        <Brackets className="mr-2 h-4 w-4" />
                        Go to Bracket Manager
                      </Link>
                    </Button>
                  </div>
                </div>
              </CardContent>
            </Card>
          )}

          {/* Participant Results with Fantasy Points */}
          {participantResults && participantResults.length > 0 && (
            <Card className={event.eventType === "playoff_game" ? "border-emerald-500/30" : ""}>
              <CardHeader>
                <div className="flex items-center justify-between">
                  <div>
                    <CardTitle className={event.eventType === "playoff_game" ? "text-emerald-400" : ""}>
                      {event.eventType === "playoff_game" ? (
                        <>
                          <Trophy className="inline mr-2 h-5 w-5" />
                          Fantasy Points Awarded (from Bracket)
                        </>
                      ) : (
                        "Fantasy Points Awarded"
                      )}
                    </CardTitle>
                    <CardDescription>
                      {event.eventType === "playoff_game"
                        ? `${participantResults.length} participants assigned placements from bracket results`
                        : "Points calculated from bracket placements (sorted by position)"
                      }
                    </CardDescription>
                  </div>
                  {event.eventType === "playoff_game" && event.isComplete && (
                    <Badge variant="default" className="bg-emerald-500">
                      <CheckCircle2 className="mr-1 h-3 w-3" />
                      Bracket Finalized
                    </Badge>
                  )}
                </div>
              </CardHeader>
              <CardContent>
                <Table>
                  <TableHeader>
                    <TableRow>
                      <TableHead className="w-32">Final Position</TableHead>
                      <TableHead>Participant</TableHead>
                      <TableHead className="w-32 text-right">Fantasy Points</TableHead>
                    </TableRow>
                  </TableHeader>
                  <TableBody>
                    {[...participantResults]
                      .toSorted((a: { finalPosition?: number | null }, b: { finalPosition?: number | null }) => {
                        const posA = a.finalPosition ?? 999;
                        const posB = b.finalPosition ?? 999;
                        return posA - posB;
                      })
                      .map((result) => (
                        <TableRow key={result.id}>
                          <TableCell>
                            <div className="flex items-center gap-2">
                              {result.finalPosition === 1 && (
                                <span className="text-xl">🥇</span>
                              )}
                              {result.finalPosition === 2 && (
                                <span className="text-xl">🥈</span>
                              )}
                              {result.finalPosition === 3 && (
                                <span className="text-xl">🥉</span>
                              )}
                              <span className="font-semibold">
                                {result.finalPosition === 0 ? (
                                  <span className="text-muted-foreground">Early Elimination</span>
                                ) : (
                                  `${result.finalPosition}${
                                    result.finalPosition === 1
                                      ? "st"
                                      : result.finalPosition === 2
                                      ? "nd"
                                      : result.finalPosition === 3
                                      ? "rd"
                                      : "th"
                                  }`
                                )}
                              </span>
                            </div>
                          </TableCell>
                          <TableCell>{result.participant?.name}</TableCell>
                          <TableCell className="text-right font-semibold">
                            {result.qualifyingPoints ? (
                              <span className={result.qualifyingPoints === "0.00" ? "text-muted-foreground" : "text-emerald-400"}>
                                {parseFloat(result.qualifyingPoints).toFixed(2)} pts
                              </span>
                            ) : (
                              <span className="text-muted-foreground">-</span>
                            )}
                          </TableCell>
                        </TableRow>
                      ))}
                  </TableBody>
                </Table>
              </CardContent>
            </Card>
          )}
        </div>
      </div>
    </div>
  );
}