import { useState } from 'react'
import type { EncounterDetail } from '../types'

interface TransferModalProps {
  hofTeam: EncounterDetail[]
  onSubmit: (encounterIds: number[]) => void
  onSkip: () => void
  isPending: boolean
}

export function TransferModal({
  hofTeam,
  onSubmit,
  onSkip,
  isPending,
}: TransferModalProps) {
  const [selected, setSelected] = useState<Set<number>>(
    () => new Set(hofTeam.map((e) => e.id))
  )

  const toggle = (id: number) => {
    setSelected((prev) => {
      const next = new Set(prev)
      if (next.has(id)) {
        next.delete(id)
      } else {
        next.add(id)
      }
      return next
    })
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
      <div className="fixed inset-0 bg-black/50" />
      <div className="relative bg-white dark:bg-gray-800 rounded-xl shadow-xl max-w-lg w-full max-h-[90vh] overflow-y-auto">
        <div className="sticky top-0 bg-white dark:bg-gray-800 border-b border-gray-200 dark:border-gray-700 px-6 py-4 rounded-t-xl">
          <h2 className="text-lg font-semibold text-gray-900 dark:text-gray-100">
            Transfer Pokemon to Next Leg
          </h2>
          <p className="text-sm text-gray-500 dark:text-gray-400 mt-1">
            Selected Pokemon will be bred down to their base form and appear as
            level 1 encounters in the next leg.
          </p>
        </div>

        <div className="px-6 py-4">
          <div className="grid grid-cols-3 gap-2">
            {hofTeam.map((enc) => {
              const displayPokemon = enc.currentPokemon ?? enc.pokemon
              const isSelected = selected.has(enc.id)

              return (
                <button
                  key={enc.id}
                  type="button"
                  onClick={() => toggle(enc.id)}
                  className={`flex flex-col items-center p-3 rounded-lg border-2 text-center transition-colors ${
                    isSelected
                      ? 'border-indigo-500 bg-indigo-50 dark:bg-indigo-900/20'
                      : 'border-gray-200 dark:border-gray-700 hover:border-gray-300 dark:hover:border-gray-600'
                  }`}
                >
                  {displayPokemon.spriteUrl ? (
                    <img
                      src={displayPokemon.spriteUrl}
                      alt={displayPokemon.name}
                      className="w-14 h-14"
                    />
                  ) : (
                    <div className="w-14 h-14 rounded-full bg-gray-200 dark:bg-gray-600 flex items-center justify-center text-lg font-bold">
                      {displayPokemon.name[0].toUpperCase()}
                    </div>
                  )}
                  <span className="text-xs font-medium text-gray-700 dark:text-gray-300 mt-1 capitalize">
                    {enc.nickname || displayPokemon.name}
                  </span>
                  {enc.nickname && (
                    <span className="text-[10px] text-gray-400">
                      {displayPokemon.name}
                    </span>
                  )}
                  <span className="text-[10px] text-gray-400 mt-0.5">
                    {enc.route.name}
                  </span>
                </button>
              )
            })}
          </div>
        </div>

        <div className="sticky bottom-0 bg-white dark:bg-gray-800 border-t border-gray-200 dark:border-gray-700 px-6 py-4 rounded-b-xl flex items-center justify-between">
          <button
            type="button"
            onClick={onSkip}
            disabled={isPending}
            className="text-sm text-gray-500 dark:text-gray-400 hover:text-gray-700 dark:hover:text-gray-200 disabled:opacity-50"
          >
            Skip (No Transfers)
          </button>
          <div className="flex items-center gap-3">
            <span className="text-sm text-gray-400 dark:text-gray-500">
              {selected.size}/{hofTeam.length} selected
            </span>
            <button
              type="button"
              disabled={selected.size === 0 || isPending}
              onClick={() => onSubmit([...selected])}
              className="px-4 py-2 bg-indigo-600 text-white rounded-lg font-medium hover:bg-indigo-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
            >
              {isPending ? 'Transferring...' : 'Transfer & Advance'}
            </button>
          </div>
        </div>
      </div>
    </div>
  )
}