import { NextResponse } from "next/server"
import { prisma } from "@/lib/prisma"
import { canManageTournament } from "@/lib/permissions"

interface RouteParams {
  params: Promise<{
    id: string
  }>
}

/**
 * DELETE /api/tournaments/[id]/teams
 *
 * Delete all teams for a tournament.
 * This will also delete any associated schedule.
 */
export async function DELETE(_request: Request, { params }: RouteParams) {
  try {
    const { id } = await params
    const tournamentId = parseInt(id)

    if (isNaN(tournamentId)) {
      return NextResponse.json(
        { error: "Invalid tournament ID" },
        { status: 400 }
      )
    }

    const permission = await canManageTournament(tournamentId)
    if (!permission.allowed) {
      return NextResponse.json(
        { error: permission.reason || "Not authorized to manage this tournament" },
        { status: 403 }
      )
    }

    // Check if tournament exists
    const tournament = await prisma.event.findUnique({
      where: { id: tournamentId },
      include: {
        teams: true,
        rounds: true,
      },
    })

    if (!tournament) {
      return NextResponse.json(
        { error: "Tournament not found" },
        { status: 404 }
      )
    }

    // Check if schedule exists
    if (tournament.rounds.length > 0) {
      return NextResponse.json(
        { error: "Cannot delete teams while schedule exists. Delete schedule first." },
        { status: 409 }
      )
    }

    // Delete all teams
    const deletedTeams = await prisma.team.deleteMany({
      where: { eventId: tournamentId },
    })

    // Reset team configuration
    await prisma.event.update({
      where: { id: tournamentId },
      data: {
        teamDurability: "permanent",
        partnerRotation: "none",
        allowByes: true,
      },
    })

    return NextResponse.json({
      success: true,
      deletedTeams: deletedTeams.count,
    })
  } catch (error: unknown) {
    console.error("Error deleting teams:", error)
    const message = error instanceof Error ? error.message : "Failed to delete teams"
    return NextResponse.json({ error: message }, { status: 500 })
  }
}

/**
 * GET /api/tournaments/[id]/teams
 *
 * Get all teams for a tournament.
 */
export async function GET(_request: Request, { params }: RouteParams) {
  try {
    const { id } = await params
    const tournamentId = parseInt(id)

    if (isNaN(tournamentId)) {
      return NextResponse.json(
        { error: "Invalid tournament ID" },
        { status: 400 }
      )
    }

    // Get tournament and teams
    const tournament = await prisma.event.findUnique({
      where: { id: tournamentId },
      include: {
        teams: {
          include: {
            player1: true,
            player2: true,
          },
        },
      },
    })

    if (!tournament) {
      return NextResponse.json(
        { error: "Tournament not found" },
        { status: 404 }
      )
    }

    return NextResponse.json({
      teams: tournament.teams,
      teamDurability: tournament.teamDurability,
      partnerRotation: tournament.partnerRotation,
      allowByes: tournament.allowByes,
    })
  } catch (error: unknown) {
    console.error("Error fetching teams:", error)
    const message = error instanceof Error ? error.message : "Failed to fetch teams"
    return NextResponse.json({ error: message }, { status: 500 })
  }
}