'use client'

import { useState } from 'react'
import { useRouter } from 'next/navigation'
import { startRound } from '@/app/actions/rounds'
import { inviteFromLobby } from '@/app/actions/invites'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { ChevronLeft, Plus, X } from 'lucide-react'
import Link from 'next/link'

type Player = {
  id: string
  role: string
  handicap_index: number | null
  course_handicap: number | null
  profile: { id: string; display_name: string; avatar_url: string | null } | null
}

type Invite = {
  id: string
  email: string
  accepted_at: string | null
  created_at: string
}

type Round = {
  id: string
  name: string | null
  date: string
  status: string
  holes_count: number
  created_by: string
  course: { id: string; name: string; par: number } | null
  tee: { id: string; name: string; color: string; course_rating: number; slope_rating: number } | null
}

export function RoundLobby({
  round,
  players,
  pendingInvites,
  currentUserId,
  isCreator,
}: {
  round: Round
  players: Player[]
  pendingInvites: Invite[]
  currentUserId: string
  isCreator: boolean
}) {
  const router = useRouter()
  const [emailInput, setEmailInput] = useState('')
  const [inviteError, setInviteError] = useState<string | null>(null)
  const [inviting, setInviting] = useState(false)
  const [starting, setStarting] = useState(false)
  const [startError, setStartError] = useState<string | null>(null)

  async function handleInvite() {
    const email = emailInput.trim().toLowerCase()
    if (!email) return
    setInviting(true)
    setInviteError(null)
    const result = await inviteFromLobby(round.id, email)
    if (result.error) {
      setInviteError(result.error)
    } else {
      setEmailInput('')
      router.refresh()
    }
    setInviting(false)
  }

  async function handleStart() {
    setStarting(true)
    setStartError(null)
    const result = await startRound(round.id)
    if (result.error) {
      setStartError(result.error)
      setStarting(false)
    } else {
      router.refresh()
    }
  }

  return (
    <div className="flex min-h-screen flex-col">
      {/* Header */}
      <div className="flex items-center gap-3 border-b p-4">
        <Link href="/dashboard">
          <ChevronLeft className="h-5 w-5" />
        </Link>
        <div className="flex-1 min-w-0">
          <h1 className="truncate font-semibold">
            {round.name ?? round.course?.name ?? 'Round'}
          </h1>
          <p className="text-xs text-muted-foreground">
            {round.course?.name} · {round.tee?.name} tees ·{' '}
            {round.holes_count} holes ·{' '}
            {new Date(round.date).toLocaleDateString()}
          </p>
        </div>
        <span className="shrink-0 rounded-full bg-yellow-100 px-2 py-0.5 text-xs font-medium text-yellow-800">
          Lobby
        </span>
      </div>

      <div className="flex-1 space-y-6 overflow-y-auto p-4">
        {/* Players */}
        <div className="space-y-3">
          <h2 className="font-semibold">
            Players ({players.length})
          </h2>
          <div className="space-y-2">
            {players.map((p) => (
              <div key={p.id} className="flex items-center gap-3 rounded-xl border p-3">
                <Avatar
                  name={p.profile?.display_name ?? '?'}
                  url={p.profile?.avatar_url}
                />
                <div className="flex-1 min-w-0">
                  <div className="flex items-center gap-2">
                    <span className="font-medium truncate">
                      {p.profile?.display_name}
                    </span>
                    {p.profile?.id === currentUserId && (
                      <span className="text-xs text-muted-foreground">(you)</span>
                    )}
                    {p.role === 'admin' && (
                      <span className="rounded-full bg-muted px-1.5 py-0.5 text-xs">
                        creator
                      </span>
                    )}
                  </div>
                  <div className="text-xs text-muted-foreground">
                    {p.handicap_index !== null
                      ? `HCP ${p.handicap_index} · Course HCP ${p.course_handicap}`
                      : 'No handicap'}
                  </div>
                </div>
              </div>
            ))}
          </div>
        </div>

        {/* Pending invites */}
        {pendingInvites.length > 0 && (
          <div className="space-y-2">
            <h3 className="text-sm font-medium text-muted-foreground">
              Awaiting ({pendingInvites.length})
            </h3>
            {pendingInvites.map((invite) => (
              <div
                key={invite.id}
                className="flex items-center gap-2 rounded-xl border border-dashed px-3 py-2"
              >
                <X className="h-3 w-3 text-muted-foreground" />
                <span className="text-sm text-muted-foreground">{invite.email}</span>
              </div>
            ))}
          </div>
        )}

        {/* Invite form (creator only, lobby only) */}
        {isCreator && round.status === 'lobby' && (
          <div className="space-y-2">
            <h3 className="text-sm font-medium">Invite player</h3>
            <div className="flex gap-2">
              <Input
                type="email"
                value={emailInput}
                onChange={(e) => setEmailInput(e.target.value)}
                onKeyDown={(e) => e.key === 'Enter' && handleInvite()}
                placeholder="player@example.com"
                className="flex-1"
              />
              <Button
                variant="outline"
                onClick={handleInvite}
                disabled={!emailInput || inviting}
              >
                <Plus className="h-4 w-4" />
              </Button>
            </div>
            {inviteError && (
              <p className="text-xs text-destructive">{inviteError}</p>
            )}
          </div>
        )}

        {/* Start round button */}
        {isCreator && round.status === 'lobby' && (
          <div className="space-y-2">
            {startError && (
              <p className="text-sm text-destructive">{startError}</p>
            )}
            <Button
              className="w-full"
              disabled={players.length < 1 || starting}
              onClick={handleStart}
            >
              {starting ? 'Starting…' : 'Start round'}
            </Button>
          </div>
        )}
      </div>
    </div>
  )
}

function Avatar({ name, url }: { name: string; url?: string | null }) {
  const initials = name
    .split(' ')
    .map((n) => n[0])
    .join('')
    .toUpperCase()
    .slice(0, 2)

  if (url) {
    return (
      <img
        src={url}
        alt={name}
        className="h-9 w-9 rounded-full object-cover"
      />
    )
  }

  return (
    <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-full bg-primary/10 text-xs font-semibold text-primary">
      {initials}
    </div>
  )
}