import { useState } from 'react'
import type { EncounterDetail, UpdateEncounterInput } from '../types'
import { useEvolutions } from '../hooks/useEncounters'
import { TypeBadge } from './TypeBadge'

interface StatusChangeModalProps {
  encounter: EncounterDetail
  onUpdate: (data: {
    id: number
    data: UpdateEncounterInput
  }) => void
  onClose: () => void
  isPending: boolean
  region?: string
}

function formatEvolutionMethod(evo: { trigger: string; minLevel: number | null; item: string | null; heldItem: string | null; condition: string | null }): string {
  const parts: string[] = []
  if (evo.trigger === 'level-up' && evo.minLevel) {
    parts.push(`Level ${evo.minLevel}`)
  } else if (evo.trigger === 'level-up') {
    parts.push('Level up')
  } else if (evo.trigger === 'use-item' && evo.item) {
    parts.push(evo.item.replace(/-/g, ' ').replace(/\b\w/g, c => c.toUpperCase()))
  } else if (evo.trigger === 'trade') {
    parts.push('Trade')
  } else {
    parts.push(evo.trigger.replace(/-/g, ' ').replace(/\b\w/g, c => c.toUpperCase()))
  }
  if (evo.heldItem) {
    parts.push(`holding ${evo.heldItem.replace(/-/g, ' ').replace(/\b\w/g, c => c.toUpperCase())}`)
  }
  if (evo.condition) {
    parts.push(evo.condition)
  }
  return parts.join(', ')
}

export function StatusChangeModal({
  encounter,
  onUpdate,
  onClose,
  isPending,
  region,
}: StatusChangeModalProps) {
  const { pokemon, currentPokemon, route, nickname, catchLevel, faintLevel, deathCause } =
    encounter
  const isDead = faintLevel !== null
  const displayPokemon = currentPokemon ?? pokemon
  const [showConfirm, setShowConfirm] = useState(false)
  const [showEvolve, setShowEvolve] = useState(false)
  const [deathLevel, setDeathLevel] = useState('')
  const [cause, setCause] = useState('')

  const activePokemonId = currentPokemon?.id ?? pokemon.id
  const { data: evolutions, isLoading: evolutionsLoading } = useEvolutions(
    showEvolve ? activePokemonId : null,
    region,
  )

  const handleConfirmDeath = () => {
    onUpdate({
      id: encounter.id,
      data: {
        faintLevel: deathLevel ? Number(deathLevel) : undefined,
        deathCause: cause || undefined,
      },
    })
  }

  const handleEvolve = (toPokemonId: number) => {
    onUpdate({
      id: encounter.id,
      data: { currentPokemonId: toPokemonId },
    })
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
      <div className="fixed inset-0 bg-black/50" onClick={onClose} />
      <div className="relative bg-white dark:bg-gray-800 rounded-xl shadow-xl max-w-sm w-full">
        {/* Header */}
        <div className="flex items-center justify-between px-6 py-4 border-b border-gray-200 dark:border-gray-700">
          <h2 className="text-lg font-semibold text-gray-900 dark:text-gray-100">
            {isDead ? 'Death Details' : 'Pokemon Status'}
          </h2>
          <button
            onClick={onClose}
            className="text-gray-400 hover:text-gray-600 dark:hover:text-gray-200"
          >
            <svg
              className="w-5 h-5"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M6 18L18 6M6 6l12 12"
              />
            </svg>
          </button>
        </div>

        <div className="px-6 py-4">
          {/* Pokemon info */}
          <div className="flex items-center gap-4 mb-4">
            {displayPokemon.spriteUrl ? (
              <img
                src={displayPokemon.spriteUrl}
                alt={displayPokemon.name}
                className={`w-16 h-16 ${isDead ? 'grayscale opacity-60' : ''}`}
              />
            ) : (
              <div className="w-16 h-16 rounded-full bg-gray-300 dark:bg-gray-600 flex items-center justify-center text-xl font-bold text-gray-600 dark:text-gray-300">
                {displayPokemon.name[0].toUpperCase()}
              </div>
            )}
            <div>
              <div className="font-semibold text-gray-900 dark:text-gray-100">
                {nickname || displayPokemon.name}
              </div>
              {nickname && (
                <div className="text-xs text-gray-500 dark:text-gray-400 capitalize">
                  {displayPokemon.name}
                </div>
              )}
              <div className="flex flex-col gap-0.5 mt-1">
                {displayPokemon.types.map((type) => (
                  <TypeBadge key={type} type={type} />
                ))}
              </div>
              <div className="text-xs text-gray-500 dark:text-gray-400 mt-1">
                Lv. {catchLevel ?? '?'} &middot; {route.name}
              </div>
              {currentPokemon && (
                <div className="text-[10px] text-gray-400 dark:text-gray-500 mt-0.5">
                  Originally: {pokemon.name}
                </div>
              )}
            </div>
          </div>

          {/* Dead pokemon: view-only details */}
          {isDead && (
            <div className="bg-red-50 dark:bg-red-900/20 rounded-lg p-4 space-y-2">
              <div className="flex items-center gap-2 text-red-700 dark:text-red-400 font-medium text-sm">
                <span className="w-2 h-2 rounded-full bg-red-500" />
                Deceased
              </div>
              {faintLevel !== null && (
                <div className="text-sm text-gray-700 dark:text-gray-300">
                  <span className="text-gray-500 dark:text-gray-400">
                    Level at death:
                  </span>{' '}
                  {faintLevel}
                </div>
              )}
              {deathCause && (
                <div className="text-sm text-gray-700 dark:text-gray-300">
                  <span className="text-gray-500 dark:text-gray-400">
                    Cause:
                  </span>{' '}
                  {deathCause}
                </div>
              )}
            </div>
          )}

          {/* Alive pokemon: actions */}
          {!isDead && !showConfirm && !showEvolve && (
            <div className="flex gap-3">
              <button
                type="button"
                onClick={() => setShowEvolve(true)}
                className="flex-1 px-4 py-2 bg-blue-600 text-white rounded-lg font-medium hover:bg-blue-700 transition-colors"
              >
                Evolve
              </button>
              <button
                type="button"
                onClick={() => setShowConfirm(true)}
                className="flex-1 px-4 py-2 bg-red-600 text-white rounded-lg font-medium hover:bg-red-700 transition-colors"
              >
                Mark as Dead
              </button>
            </div>
          )}

          {/* Evolution selection */}
          {!isDead && showEvolve && (
            <div className="space-y-3">
              <div className="flex items-center justify-between">
                <h3 className="text-sm font-medium text-gray-700 dark:text-gray-300">
                  Evolve into:
                </h3>
                <button
                  type="button"
                  onClick={() => setShowEvolve(false)}
                  className="text-xs text-gray-500 hover:text-gray-700 dark:hover:text-gray-300"
                >
                  Back
                </button>
              </div>
              {evolutionsLoading && (
                <p className="text-sm text-gray-500 dark:text-gray-400">Loading evolutions...</p>
              )}
              {!evolutionsLoading && evolutions && evolutions.length === 0 && (
                <p className="text-sm text-gray-500 dark:text-gray-400">No evolutions available</p>
              )}
              {!evolutionsLoading && evolutions && evolutions.length > 0 && (
                <div className="space-y-2">
                  {evolutions.map((evo) => (
                    <button
                      key={evo.id}
                      type="button"
                      disabled={isPending}
                      onClick={() => handleEvolve(evo.toPokemon.id)}
                      className="w-full flex items-center gap-3 p-3 rounded-lg border border-gray-200 dark:border-gray-600 hover:bg-blue-50 dark:hover:bg-blue-900/20 hover:border-blue-300 dark:hover:border-blue-600 transition-colors disabled:opacity-50"
                    >
                      {evo.toPokemon.spriteUrl ? (
                        <img src={evo.toPokemon.spriteUrl} alt={evo.toPokemon.name} className="w-10 h-10" />
                      ) : (
                        <div className="w-10 h-10 rounded-full bg-gray-300 dark:bg-gray-600 flex items-center justify-center text-sm font-bold text-gray-600 dark:text-gray-300">
                          {evo.toPokemon.name[0].toUpperCase()}
                        </div>
                      )}
                      <div className="text-left">
                        <div className="font-medium text-gray-900 dark:text-gray-100 text-sm">
                          {evo.toPokemon.name}
                        </div>
                        <div className="text-xs text-gray-500 dark:text-gray-400">
                          {formatEvolutionMethod(evo)}
                        </div>
                      </div>
                    </button>
                  ))}
                </div>
              )}
            </div>
          )}

          {/* Confirmation form */}
          {!isDead && showConfirm && (
            <div className="space-y-3">
              <div className="bg-red-50 dark:bg-red-900/20 rounded-lg p-3">
                <p className="text-sm text-red-700 dark:text-red-400 font-medium">
                  This cannot be undone (Nuzlocke rules).
                </p>
              </div>

              <div>
                <label
                  htmlFor="death-level"
                  className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1"
                >
                  Level at Death{' '}
                  <span className="font-normal text-gray-400">(optional)</span>
                </label>
                <input
                  id="death-level"
                  type="number"
                  min={1}
                  max={100}
                  value={deathLevel}
                  onChange={(e) => setDeathLevel(e.target.value)}
                  placeholder="Level"
                  className="w-24 px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-red-500"
                />
              </div>

              <div>
                <label
                  htmlFor="death-cause"
                  className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1"
                >
                  Cause of Death{' '}
                  <span className="font-normal text-gray-400">(optional)</span>
                </label>
                <input
                  id="death-cause"
                  type="text"
                  maxLength={100}
                  value={cause}
                  onChange={(e) => setCause(e.target.value)}
                  placeholder="e.g. Crit from rival's Charizard"
                  className="w-full px-3 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-red-500"
                />
              </div>

              <div className="flex gap-3 pt-1">
                <button
                  type="button"
                  onClick={() => setShowConfirm(false)}
                  className="flex-1 px-4 py-2 bg-gray-100 dark:bg-gray-700 text-gray-700 dark:text-gray-300 rounded-lg font-medium hover:bg-gray-200 dark:hover:bg-gray-600 transition-colors"
                >
                  Cancel
                </button>
                <button
                  type="button"
                  disabled={isPending}
                  onClick={handleConfirmDeath}
                  className="flex-1 px-4 py-2 bg-red-600 text-white rounded-lg font-medium hover:bg-red-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
                >
                  {isPending ? 'Saving...' : 'Confirm Death'}
                </button>
              </div>
            </div>
          )}
        </div>

        {/* Footer for dead/no-confirm/no-evolve views */}
        {(isDead || (!isDead && !showConfirm && !showEvolve)) && (
          <div className="px-6 py-4 border-t border-gray-200 dark:border-gray-700 flex justify-end">
            <button
              type="button"
              onClick={onClose}
              className="px-4 py-2 bg-gray-100 dark:bg-gray-700 text-gray-700 dark:text-gray-300 rounded-lg font-medium hover:bg-gray-200 dark:hover:bg-gray-600 transition-colors"
            >
              Close
            </button>
          </div>
        )}
      </div>
    </div>
  )
}