'use client'

import { useCallback, useEffect, useState } from 'react'
import { ExternalLink, ShoppingCart, Loader2, AlertCircle } from 'lucide-react'
import { Button } from '@/components/ui/button'
import { getTopPartsForManual, type PartForPage } from '@/lib/parts-lookup'

interface PartsPanelProps {
  manualFilename: string
  className?: string
}

export function PartsPanel({ manualFilename, className = '' }: PartsPanelProps) {
  const [parts, setParts] = useState<PartForPage[]>([])
  const [isLoading, setIsLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  const loadParts = useCallback(async () => {
    setIsLoading(true)
    setError(null)

    try {
      const result = await getTopPartsForManual(manualFilename, 5)
      setParts(result.parts)
      setError(result.error ?? null)
    } catch (err) {
      console.error('Error loading parts:', err)
      setParts([])
      setError('Could not load parts')
    } finally {
      setIsLoading(false)
    }
  }, [manualFilename])

  useEffect(() => {
    if (manualFilename) {
      void loadParts()
    }
  }, [loadParts, manualFilename])

  const hasListings = parts.some((part) => part.ebayListings.length > 0)

  const renderStatusCard = (title: string, message: string) => (
    <div className={`flex flex-col h-full ${className}`}>
      <div className="px-3 py-2 border-b border-yellow-300/20 flex-shrink-0 bg-yellow-100/50 dark:bg-yellow-900/30">
        <div className="flex items-center gap-1.5">
          <ShoppingCart className="h-3.5 w-3.5 text-yellow-900 dark:text-yellow-100" />
          <span className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">
            Parts
          </span>
        </div>
      </div>
      <div className="flex flex-1 flex-col items-center justify-center px-3 py-4 text-center">
        <AlertCircle className="h-5 w-5 text-yellow-700 dark:text-yellow-300 mb-2" />
        <p className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">{title}</p>
        <p className="mt-1 text-[11px] leading-relaxed text-yellow-900/70 dark:text-yellow-100/70">
          {message}
        </p>
        <Button
          variant="outline"
          size="sm"
          onClick={() => void loadParts()}
          className="mt-3 h-8 text-[11px] border-yellow-300/60 text-yellow-900 hover:bg-yellow-100 dark:border-yellow-700/60 dark:text-yellow-100 dark:hover:bg-yellow-900/40"
        >
          Retry
        </Button>
      </div>
    </div>
  )

  if (isLoading) {
    return (
      <div className={`flex flex-col h-full ${className}`}>
        <div className="px-3 py-2 border-b border-yellow-300/20 flex-shrink-0 bg-yellow-100/50 dark:bg-yellow-900/30">
          <div className="flex items-center gap-1.5">
            <ShoppingCart className="h-3.5 w-3.5 text-yellow-900 dark:text-yellow-100" />
            <span className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">
              Parts
            </span>
          </div>
        </div>
        <div className="px-3 py-3 text-sm text-yellow-900/70 dark:text-yellow-100/70 flex items-center justify-center">
          <Loader2 className="h-4 w-4 mr-2 animate-spin" />
          Loading parts...
        </div>
      </div>
    )
  }

  if (error && !hasListings) {
    const loweredError = error.toLowerCase()
    const statusMessage = error.includes('eBay API not configured')
      ? 'Set EBAY_APP_ID in the app environment so live listings can load.'
      : loweredError.includes('rate limit') || loweredError.includes('exceeded')
        ? 'eBay is temporarily rate-limited. Try again in a minute.'
        : error

    return renderStatusCard(
      'eBay unavailable',
      statusMessage,
    )
  }

  if (parts.length === 0) {
    return (
      <div className={`flex flex-col h-full ${className}`}>
        <div className="px-3 py-2 border-b border-yellow-300/20 flex-shrink-0 bg-yellow-100/50 dark:bg-yellow-900/30">
          <div className="flex items-center gap-1.5">
            <ShoppingCart className="h-3.5 w-3.5 text-yellow-900 dark:text-yellow-100" />
            <span className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">
              Parts
            </span>
          </div>
        </div>
        <div className="px-3 py-3 text-xs text-yellow-900/70 dark:text-yellow-100/70 flex items-center justify-center">
          <AlertCircle className="h-4 w-4 mr-2 text-yellow-700 dark:text-yellow-300" />
          No parts data extracted for this manual yet
        </div>
      </div>
    )
  }

  if (!hasListings) {
    return (
      <div className={`flex flex-col h-full ${className}`}>
        <div className="px-3 py-2 border-b border-yellow-300/20 flex-shrink-0 bg-yellow-100/50 dark:bg-yellow-900/30">
          <div className="flex items-center gap-1.5">
            <ShoppingCart className="h-3.5 w-3.5 text-yellow-900 dark:text-yellow-100" />
            <span className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">
              Parts
            </span>
          </div>
        </div>
        <div className="px-3 py-3 text-xs text-yellow-900/70 dark:text-yellow-100/70 flex items-center justify-center">
          <AlertCircle className="h-4 w-4 mr-2 text-yellow-700 dark:text-yellow-300" />
          No live eBay matches found for these parts yet
        </div>
      </div>
    )
  }

  return (
    <div className={`flex flex-col h-full overflow-hidden ${className}`}>
      <div className="px-3 py-2 border-b border-yellow-300/20 flex-shrink-0 bg-yellow-100/50 dark:bg-yellow-900/30">
        <div className="flex items-center gap-1.5">
          <ShoppingCart className="h-3.5 w-3.5 text-yellow-900 dark:text-yellow-100" />
          <span className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">
            Parts ({parts.length})
          </span>
        </div>
      </div>
      
      <div className="flex-1 overflow-y-auto px-3 py-2 space-y-2">
        {error && (
          <div className="rounded-md border border-yellow-300/40 bg-yellow-50/80 px-3 py-2 text-[11px] text-yellow-900 dark:border-yellow-700/40 dark:bg-yellow-950/40 dark:text-yellow-100">
            <div className="flex items-start gap-2">
              <AlertCircle className="mt-0.5 h-3.5 w-3.5 flex-shrink-0" />
              <div className="min-w-0">
                <p className="font-medium">
                  Live eBay listings are unavailable right now.
                </p>
                <p className="mt-0.5 text-yellow-900/70 dark:text-yellow-100/70">
                  {error.includes('eBay API not configured')
                    ? 'Set EBAY_APP_ID in the app environment, then reload the panel.'
                    : error.toLowerCase().includes('rate limit') || error.toLowerCase().includes('exceeded')
                      ? 'eBay is temporarily rate-limited. Reload after a short wait.'
                    : error}
                </p>
              </div>
            </div>
          </div>
        )}

        {parts.map((part, index) => (
          <div
            key={`${part.partNumber}-${index}`}
            className="bg-white/60 dark:bg-yellow-900/20 rounded border border-yellow-300/30 dark:border-yellow-700/30 p-2 space-y-1.5"
          >
            {/* Part Header */}
            <div className="space-y-1">
              <div className="text-xs font-semibold text-yellow-900 dark:text-yellow-100 truncate">
                {part.partNumber}
              </div>
              {part.description && (
                <div className="text-[10px] text-yellow-800/80 dark:text-yellow-200/70 line-clamp-1">
                  {part.description}
                </div>
              )}
            </div>

            {/* eBay Listings */}
            {part.ebayListings.length > 0 && (
              <div className="space-y-1.5">
                {part.ebayListings.slice(0, 2).map((listing) => (
                  <a
                    key={listing.itemId}
                    href={listing.affiliateLink}
                    target="_blank"
                    rel="noopener noreferrer"
                    className="block group"
                  >
                    <div className="bg-white dark:bg-yellow-900/30 rounded border border-yellow-300/40 dark:border-yellow-700/40 p-1.5 hover:bg-yellow-50 dark:hover:bg-yellow-900/40 transition-colors">
                      {/* Image */}
                      {listing.imageUrl && (
                        <div className="mb-1.5 rounded overflow-hidden bg-yellow-100 dark:bg-yellow-900/50">
                          <img
                            src={listing.imageUrl}
                            alt={listing.title}
                            className="w-full h-20 object-cover"
                            onError={(e) => {
                              e.currentTarget.src = `https://via.placeholder.com/150x80/fbbf24/1f2937?text=${encodeURIComponent(part.partNumber)}`
                            }}
                          />
                        </div>
                      )}
                      {!listing.imageUrl && (
                        <div className="mb-1.5 rounded overflow-hidden bg-yellow-100 dark:bg-yellow-900/50 h-20 flex items-center justify-center">
                          <span className="text-[10px] text-yellow-700 dark:text-yellow-300">{part.partNumber}</span>
                        </div>
                      )}
                      
                      {/* Listing Details */}
                      <div className="space-y-1">
                        <div className="text-[10px] text-yellow-900 dark:text-yellow-100 line-clamp-2 min-h-[1.5rem]">
                          {listing.title}
                        </div>
                        <div className="flex items-center justify-between">
                          <div className="flex flex-col gap-0.5">
                            <span className="text-xs font-semibold text-yellow-900 dark:text-yellow-100">
                              {listing.price}
                            </span>
                            {listing.shippingCost && (
                              <span className="text-[9px] text-yellow-700 dark:text-yellow-300">
                                {listing.shippingCost === 'Free' ? 'Free' : listing.shippingCost}
                              </span>
                            )}
                          </div>
                          <ExternalLink className="h-3 w-3 text-yellow-700 dark:text-yellow-300 group-hover:text-yellow-900 dark:group-hover:text-yellow-100 transition-colors flex-shrink-0" />
                        </div>
                        {listing.condition && (
                          <div className="text-[9px] text-yellow-700/80 dark:text-yellow-300/80">
                            {listing.condition}
                          </div>
                        )}
                      </div>
                    </div>
                  </a>
                ))}
              </div>
            )}

            {/* View All Listings Button */}
            {part.ebayListings.length > 2 && (
              <div className="pt-1">
                <Button
                  variant="ghost"
                  size="sm"
                  className="w-full text-[10px] text-yellow-700 dark:text-yellow-300 hover:text-yellow-900 dark:hover:text-yellow-100"
                >
                  View All {part.ebayListings.length} Listings
                </Button>
              </div>
            )}
          </div>
        ))}

        {/* View All Parts Button */}
        {parts.length > 3 && (
          <div className="pt-2 pb-3">
            <Button
              variant="ghost"
              size="sm"
              className="w-full text-sm text-yellow-700 dark:text-yellow-300 hover:text-yellow-900 dark:hover:text-yellow-100"
            >
              View All Parts
            </Button>
          </div>
        )}
      </div>
    </div>
  )
}