import { NextRequest, NextResponse } from 'next/server';

// Alpha: In-memory prize storage
const prizes: Map<string, {
  id: string;
  leagueId: string;
  seasonId: string;
  position: number;
  name: string;
  amount: number;
  type: 'cash' | 'merchandise' | 'other';
  description?: string;
  awarded: boolean;
  awardedTo?: string;
  awardedAt?: Date;
  createdAt: Date;
}> = new Map();

export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url);
  const leagueId = searchParams.get('leagueId');
  const seasonId = searchParams.get('seasonId');

  if (!leagueId) {
    return NextResponse.json(
      { error: 'leagueId is required' },
      { status: 400 }
    );
  }

  let results = Array.from(prizes.values()).filter(p => p.leagueId === leagueId);
  
  if (seasonId) {
    results = results.filter(p => p.seasonId === seasonId);
  }

  results.sort((a, b) => a.position - b.position);

  return NextResponse.json({ prizes: results });
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { leagueId, seasonId, position, name, amount, type, description } = body;

    if (!leagueId || !seasonId || !position || !name || amount === undefined || !type) {
      return NextResponse.json(
        { error: 'Missing required fields: leagueId, seasonId, position, name, amount, type' },
        { status: 400 }
      );
    }

    if (!['cash', 'merchandise', 'other'].includes(type)) {
      return NextResponse.json(
        { error: 'Type must be \"cash\", \"merchandise\", or \"other\"' },
        { status: 400 }
      );
    }

    // Check for duplicate position
    const existingPrize = Array.from(prizes.values()).find(
      p => p.leagueId === leagueId && p.seasonId === seasonId && p.position === position
    );

    if (existingPrize) {
      return NextResponse.json(
        { error: `Prize for position ${position} already exists` },
        { status: 409 }
      );
    }

    const id = `prize-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
    const prize = {
      id,
      leagueId,
      seasonId,
      position,
      name,
      amount,
      type,
      description: description || undefined,
      awarded: false,
      createdAt: new Date(),
    };

    prizes.set(id, prize);

    return NextResponse.json({ prize }, { status: 201 });
  } catch (err) {
    console.error('Prize creation failed:', err);
    return NextResponse.json(
      { error: 'Failed to create prize' },
      { status: 500 }
    );
  }
}

// Award a prize
export async function PATCH(request: NextRequest) {
  try {
    const body = await request.json();
    const { prizeId, driverId } = body;

    if (!prizeId || !driverId) {
      return NextResponse.json(
        { error: 'Missing required fields: prizeId, driverId' },
        { status: 400 }
      );
    }

    const prize = prizes.get(prizeId);
    if (!prize) {
      return NextResponse.json(
        { error: 'Prize not found' },
        { status: 404 }
      );
    }

    if (prize.awarded) {
      return NextResponse.json(
        { error: 'Prize has already been awarded' },
        { status: 400 }
      );
    }

    prize.awarded = true;
    prize.awardedTo = driverId;
    prize.awardedAt = new Date();

    prizes.set(prizeId, prize);

    return NextResponse.json({ prize });
  } catch (err) {
    console.error('Prize awarding failed:', err);
    return NextResponse.json(
      { error: 'Failed to award prize' },
      { status: 500 }
    );
  }
}

export async function DELETE(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const prizeId = searchParams.get('prizeId');

    if (!prizeId) {
      return NextResponse.json(
        { error: 'prizeId is required' },
        { status: 400 }
      );
    }

    const prize = prizes.get(prizeId);
    if (!prize) {
      return NextResponse.json(
        { error: 'Prize not found' },
        { status: 404 }
      );
    }

    if (prize.awarded) {
      return NextResponse.json(
        { error: 'Cannot delete an awarded prize' },
        { status: 400 }
      );
    }

    prizes.delete(prizeId);

    return NextResponse.json({ success: true });
  } catch (err) {
    console.error('Prize deletion failed:', err);
    return NextResponse.json(
      { error: 'Failed to delete prize' },
      { status: 500 }
    );
  }
}