'use client'

import { useState, useEffect, useCallback } from 'react'
import { useSession } from 'next-auth/react'
import { useParams, useRouter } from 'next/navigation'
import Image from 'next/image'
import Link from 'next/link'
import Header from '@/components/Header'
import { useThemeStyles, cn } from '@/lib/ui-styles'

// 内联SVG图标组件
const UserIcon = ({ className }: { className?: string }) => (
  <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z" />
  </svg>
)

const ArrowLeftIcon = ({ className }: { className?: string }) => (
  <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10 19l-7-7m0 0l7-7m-7 7h18" />
  </svg>
)

const DownloadIcon = ({ className }: { className?: string }) => (
  <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4" />
  </svg>
)

const HeartIcon = ({ className }: { className?: string }) => (
  <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4.318 6.318a4.5 4.5 0 000 6.364L12 20.364l7.682-7.682a4.5 4.5 0 00-6.364-6.364L12 7.636l-1.318-1.318a4.5 4.5 0 00-6.364 0z" />
  </svg>
)

const ChevronLeftIcon = ({ className }: { className?: string }) => (
  <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
  </svg>
)

const ChevronRightIcon = ({ className }: { className?: string }) => (
  <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
  </svg>
)

interface Material {
  id: string
  productModel: string
  previewUrl: string
  materialType: string | null
  categoryName: string
  sceneName: string
  downloadCount: number
  likeCount: number
  createdAt: string
  user?: {
    username: string
    avatar: string | null
  }
}

interface AuthorMaterialsResponse {
  materials: Material[]
  pagination: {
    page: number
    pageSize: number
    total: number
    totalPages: number
  }
  author: {
    name: string
    totalMaterials: number
    totalDownloads: number
    totalLikes: number
  }
}

export default function AuthorPage() {
  const { data: session, status } = useSession()
  const params = useParams()
  const router = useRouter()
  const styles = useThemeStyles()
  const authorName = decodeURIComponent(params.authorName as string)

  const [materials, setMaterials] = useState<Material[]>([])
  const [loading, setLoading] = useState(true)
  const [page, setPage] = useState(1)
  const [totalPages, setTotalPages] = useState(1)
  const [authorStats, setAuthorStats] = useState({
    name: authorName,
    totalMaterials: 0,
    totalDownloads: 0,
    totalLikes: 0,
    avatar: null as string | null,
  })
  const pageSize = 20

  const fetchMaterials = useCallback(async () => {
    if (status !== 'authenticated') return

    setLoading(true)
    try {
      const res = await fetch(
        `/api/materials?authorName=${encodeURIComponent(authorName)}&page=${page}&pageSize=${pageSize}`
      )
      if (res.ok) {
        const data = await res.json()
        setMaterials(data.materials || [])
        setTotalPages(data.pagination?.totalPages || 1)
        // 计算作者统计
        if (data.materials?.length > 0) {
          const totalDownloads = data.materials.reduce(
            (sum: number, m: Material) => sum + m.downloadCount,
            0
          )
          const totalLikes = data.materials.reduce(
            (sum: number, m: Material) => sum + m.likeCount,
            0
          )
          // 获取作者头像（从第一个素材的用户信息中获取）
          const authorAvatar = data.materials[0]?.user?.avatar || null
          setAuthorStats({
            name: authorName,
            totalMaterials: data.pagination?.total || data.materials.length,
            totalDownloads,
            totalLikes,
            avatar: authorAvatar,
          })
        }
      }
    } catch (error) {
      console.error('Failed to fetch author materials:', error)
    } finally {
      setLoading(false)
    }
  }, [authorName, page, status])

  useEffect(() => {
    if (status === 'unauthenticated') {
      router.push('/login')
      return
    }

    if (status === 'authenticated') {
      fetchMaterials()
    }
  }, [fetchMaterials, router, status])

  return (
    <div className="min-h-screen bg-slate-50 dark:bg-slate-900">
      <Header session={session} />
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        {/* 返回按钮 */}
        <button
          onClick={() => router.back()}
          className="flex items-center gap-2 text-slate-600 dark:text-slate-400 hover:text-slate-900 dark:hover:text-white mb-6 transition-colors"
        >
          <ArrowLeftIcon className="w-5 h-5" />
          返回
        </button>

        {/* 作者信息卡片 */}
        <div className={cn(styles.cardStyles.base, 'mb-8')}>
          <div className="flex items-center gap-6">
            {authorStats.avatar ? (
              <div className="w-20 h-20 rounded-full overflow-hidden">
                <Image
                  src={authorStats.avatar}
                  alt={authorStats.name}
                  width={80}
                  height={80}
                  className="w-full h-full object-cover"
                />
              </div>
            ) : (
              <div className="w-20 h-20 rounded-full border border-slate-200 bg-slate-100 dark:border-slate-700 dark:bg-slate-800 flex items-center justify-center">
                <UserIcon className="w-10 h-10 text-slate-500 dark:text-slate-300" />
              </div>
            )}
            <div className="flex-1">
              <h1 className="text-2xl font-bold text-slate-900 dark:text-white mb-2">
                {authorStats.name}
              </h1>
              <div className="flex flex-wrap gap-6 text-sm text-slate-600 dark:text-slate-400">
                <div className="flex items-center gap-2">
                  <span className="font-medium text-slate-900 dark:text-white">
                    {authorStats.totalMaterials}
                  </span>
                  <span>作品</span>
                </div>
                <div className="flex items-center gap-2">
                  <DownloadIcon className="w-4 h-4" />
                  <span className="font-medium text-slate-900 dark:text-white">
                    {authorStats.totalDownloads}
                  </span>
                  <span>下载</span>
                </div>
                <div className="flex items-center gap-2">
                  <HeartIcon className="w-4 h-4" />
                  <span className="font-medium text-slate-900 dark:text-white">
                    {authorStats.totalLikes}
                  </span>
                  <span>点赞</span>
                </div>
              </div>
            </div>
          </div>
        </div>

        {/* 作品列表 */}
        {loading ? (
          <div className="flex items-center justify-center py-16">
            <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-500"></div>
          </div>
        ) : materials.length === 0 ? (
          <div className="text-center py-16">
            <UserIcon className="w-16 h-16 mx-auto text-slate-300 dark:text-slate-600 mb-4" />
            <p className="text-slate-500 dark:text-slate-400">该作者暂无作品</p>
          </div>
        ) : (
          <>
            <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 gap-4">
              {materials.map((material) => (
                <Link
                  key={material.id}
                  href={`/share/${material.id}`}
                  className="group relative bg-white dark:bg-slate-800 rounded-xl overflow-hidden shadow-sm hover:shadow-md transition-shadow"
                >
                  <div className="aspect-[4/3] relative bg-slate-100 dark:bg-slate-700">
                    <Image
                      src={material.previewUrl}
                      alt={material.productModel}
                      fill
                      className="object-cover group-hover:scale-105 transition-transform duration-300"
                      sizes="(max-width: 640px) 50vw, (max-width: 768px) 33vw, (max-width: 1024px) 25vw, 20vw"
                    />
                  </div>
                  <div className="p-3">
                    <h3 className="text-sm font-medium text-slate-900 dark:text-white truncate">
                      {material.productModel}
                    </h3>
                    <div className="flex items-center justify-between mt-2 text-xs text-slate-500 dark:text-slate-400">
                      <span>{material.materialType || material.categoryName}</span>
                      <div className="flex items-center gap-3">
                        <span className="flex items-center gap-1">
                          <DownloadIcon className="w-3 h-3" />
                          {material.downloadCount}
                        </span>
                        <span className="flex items-center gap-1">
                          <HeartIcon className="w-3 h-3" />
                          {material.likeCount}
                        </span>
                      </div>
                    </div>
                  </div>
                </Link>
              ))}
            </div>

            {/* 分页 */}
            {totalPages > 1 && (
              <div className="flex items-center justify-center gap-2 mt-8">
                <button
                  onClick={() => setPage((p) => Math.max(1, p - 1))}
                  disabled={page === 1}
                  className="p-2 rounded-lg hover:bg-slate-100 dark:hover:bg-slate-700 disabled:opacity-50 disabled:cursor-not-allowed"
                >
                  <ChevronLeftIcon className="w-5 h-5" />
                </button>
                <span className="text-sm text-slate-600 dark:text-slate-400">
                  {page} / {totalPages}
                </span>
                <button
                  onClick={() => setPage((p) => Math.min(totalPages, p + 1))}
                  disabled={page === totalPages}
                  className="p-2 rounded-lg hover:bg-slate-100 dark:hover:bg-slate-700 disabled:opacity-50 disabled:cursor-not-allowed"
                >
                  <ChevronRightIcon className="w-5 h-5" />
                </button>
              </div>
            )}
          </>
        )}
      </div>
    </div>
  )
}