import { Form, Link, redirect } from "react-router";
import { getAuth } from "@clerk/react-router/server";
import { createLeague } from "~/models/league";
import { createSeason } from "~/models/season";
import { createManyTeams } from "~/models/team";
import { createCommissioner } from "~/models/commissioner";
import type { Route } from "./+types/new";
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";

export async function action(args: Route.ActionArgs) {
  const { userId } = await getAuth(args);
  const { request } = args;
  
  if (!userId) {
    throw new Response("Unauthorized", { status: 401 });
  }

  const formData = await request.formData();
  const name = formData.get("name");
  const teamCount = formData.get("teamCount");

  // Validation
  if (typeof name !== "string" || !name.trim()) {
    return { error: "League name is required" };
  }

  if (typeof teamCount !== "string") {
    return { error: "Number of teams is required" };
  }

  const teamCountNum = parseInt(teamCount, 10);
  if (isNaN(teamCountNum) || teamCountNum < 6 || teamCountNum > 16) {
    return { error: "Number of teams must be between 6 and 16" };
  }

  try {
    // Create league
    const league = await createLeague({
      name: name.trim(),
      createdBy: userId,
    });

    // Make creator a commissioner
    await createCommissioner({
      leagueId: league.id,
      userId: userId,
    });

    // Create first season
    const currentYear = new Date().getFullYear();
    const season = await createSeason({
      leagueId: league.id,
      year: currentYear,
      status: "pre_draft",
    });

    // Create teams with placeholder names
    const teams = Array.from({ length: teamCountNum }, (_, i) => ({
      seasonId: season.id,
      name: `Team ${i + 1}`,
      ownerId: i === 0 ? userId : null, // Assign first team to creator
    }));

    await createManyTeams(teams);

    // Redirect to league homepage
    return redirect(`/leagues/${league.id}`);
  } catch (error) {
    console.error("Error creating league:", error);
    return { error: "Failed to create league. Please try again." };
  }
}

export default function NewLeague({ actionData }: Route.ComponentProps) {
  return (
    <div className="container max-w-2xl mx-auto py-8 px-4">
      <Card>
        <CardHeader>
          <CardTitle className="text-3xl">Start a New League</CardTitle>
          <CardDescription>
            Create your fantasy league and invite your friends to compete.
          </CardDescription>
        </CardHeader>
        <CardContent>
          <Form method="post" className="space-y-6">
            <div className="space-y-2">
              <Label htmlFor="name">League Name</Label>
              <Input
                id="name"
                name="name"
                type="text"
                placeholder="Enter league name"
                required
                minLength={3}
                maxLength={50}
              />
            </div>

            <div className="space-y-2">
              <Label htmlFor="teamCount">Number of Teams</Label>
              <Select name="teamCount" defaultValue="12" required>
                <SelectTrigger id="teamCount">
                  <SelectValue placeholder="Select number of teams" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="6">6 Teams</SelectItem>
                  <SelectItem value="7">7 Teams</SelectItem>
                  <SelectItem value="8">8 Teams</SelectItem>
                  <SelectItem value="9">9 Teams</SelectItem>
                  <SelectItem value="10">10 Teams</SelectItem>
                  <SelectItem value="11">11 Teams</SelectItem>
                  <SelectItem value="12">12 Teams</SelectItem>
                  <SelectItem value="13">13 Teams</SelectItem>
                  <SelectItem value="14">14 Teams</SelectItem>
                  <SelectItem value="15">15 Teams</SelectItem>
                  <SelectItem value="16">16 Teams</SelectItem>
                </SelectContent>
              </Select>
              <p className="text-sm text-muted-foreground">
                Choose between 6 and 16 teams
              </p>
            </div>

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

            <div className="flex gap-4">
              <Button type="submit" className="flex-1">
                Create League
              </Button>
              <Button type="button" variant="outline" asChild>
                <Link to="/">Cancel</Link>
              </Button>
            </div>
          </Form>
        </CardContent>
      </Card>
    </div>
  );
}