'use client'

import { useState, useEffect } from 'react'
import { createList, updateList } from '@/lib/actions'
import { useRouter } from 'next/navigation'
import { useToast } from './ToastContainer'
import { validateListTitle } from '@/lib/validation'

interface ListFormProps {
  list?: {
    id: string
    title: string
    color: string
  }
  onCancel?: () => void
  onSuccess?: () => void
}

const PRESET_COLORS = [
  '#3B82F6', // blue
  '#EF4444', // red
  '#10B981', // green
  '#F59E0B', // amber
  '#8B5CF6', // purple
  '#EC4899', // pink
  '#06B6D4', // cyan
  '#F97316', // orange
]

export default function ListForm({ list, onCancel, onSuccess }: ListFormProps) {
  const router = useRouter()
  const { showToast } = useToast()
  const [title, setTitle] = useState(list?.title || '')
  const [color, setColor] = useState(list?.color || PRESET_COLORS[0])
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [error, setError] = useState('')
  const [touched, setTouched] = useState(false)

  // Inline validation when title changes
  useEffect(() => {
    if (touched) {
      const result = validateListTitle(title)
      setError(result.isValid ? '' : result.error || '')
    }
  }, [title, touched])

  const handleTitleBlur = () => {
    setTouched(true)
    const result = validateListTitle(title)
    setError(result.isValid ? '' : result.error || '')
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    
    // Validate before submission
    const result = validateListTitle(title)
    if (!result.isValid) {
      setError(result.error || 'Invalid input')
      setTouched(true)
      return
    }

    setIsSubmitting(true)
    setError('')

    try {
      if (list) {
        // Update existing list
        await updateList(list.id, { title: title.trim(), color })
        showToast('List updated successfully', 'success')
      } else {
        // Create new list
        await createList(title.trim(), color)
        showToast('List created successfully', 'success')
      }
      
      if (onSuccess) {
        onSuccess()
      } else {
        router.refresh()
      }
    } catch (err) {
      const errorMessage = err instanceof Error ? err.message : 'Failed to save list. Please try again.'
      setError(errorMessage)
      showToast(errorMessage, 'error')
      console.error(err)
    } finally {
      setIsSubmitting(false)
    }
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-4 sm:space-y-5">
      <div>
        <label htmlFor="title" className="block text-sm font-medium text-gray-700 mb-2">
          List Title *
        </label>
        <input
          type="text"
          id="title"
          value={title}
          onChange={(e) => setTitle(e.target.value)}
          onBlur={handleTitleBlur}
          className={`w-full px-3 sm:px-4 py-3 border rounded-lg focus:outline-none focus:ring-2 text-sm sm:text-base ${
            error && touched
              ? 'border-red-500 focus:ring-red-500'
              : 'border-gray-300 focus:ring-blue-500'
          }`}
          placeholder="Enter list title"
          disabled={isSubmitting}
          autoFocus
          maxLength={200}
          aria-invalid={error && touched ? 'true' : 'false'}
          aria-describedby={error && touched ? 'title-error' : undefined}
        />
        {error && touched && (
          <p id="title-error" className="mt-1.5 text-xs sm:text-sm text-red-600">
            {error}
          </p>
        )}
      </div>

      <div>
        <label className="block text-sm font-medium text-gray-700 mb-2 sm:mb-3">
          Color
        </label>
        <div className="flex gap-2 sm:gap-3 flex-wrap">
          {PRESET_COLORS.map((presetColor) => (
            <button
              key={presetColor}
              type="button"
              onClick={() => setColor(presetColor)}
              className={`w-11 h-11 sm:w-12 sm:h-12 rounded-lg transition-all tap-target-sm ${
                color === presetColor
                  ? 'ring-2 ring-offset-2 ring-gray-400 scale-110'
                  : 'hover:scale-105 active:scale-95'
              }`}
              style={{ backgroundColor: presetColor }}
              disabled={isSubmitting}
              aria-label={`Select color ${presetColor}`}
            />
          ))}
        </div>
      </div>

      <div className="flex flex-col-reverse sm:flex-row gap-2 sm:gap-3 justify-end pt-2">
        {onCancel && (
          <button
            type="button"
            onClick={onCancel}
            disabled={isSubmitting}
            className="w-full sm:w-auto px-4 sm:px-5 py-3 text-gray-700 bg-gray-100 hover:bg-gray-200 active:bg-gray-300 rounded-lg transition-colors disabled:opacity-50 tap-target font-medium text-sm sm:text-base"
          >
            Cancel
          </button>
        )}
        <button
          type="submit"
          disabled={isSubmitting}
          className="w-full sm:w-auto px-4 sm:px-5 py-3 bg-blue-500 hover:bg-blue-600 active:bg-blue-700 text-white rounded-lg transition-colors disabled:opacity-50 tap-target font-medium text-sm sm:text-base"
        >
          {isSubmitting ? 'Saving...' : list ? 'Update List' : 'Create List'}
        </button>
      </div>
    </form>
  )
}