"use client"

import { useState, useEffect } from "react"
import { useRouter } from "next/navigation"
import { ChevronLeft, Lock, Share2, Sparkles } from "lucide-react"
import { type Section, getFullBookPrice, getTotalSectionCount } from "@/lib/book-data"
import { useStore } from "@/lib/store"
import { PaymentModal } from "./payment-modal"
import { AuthModal } from "./modules/auth/auth-modal"

interface ChapterContentProps {
  section: Section & { filePath: string }
  partTitle: string
  chapterTitle: string
}

export function ChapterContent({ section, partTitle, chapterTitle }: ChapterContentProps) {
  const router = useRouter()
  const [content, setContent] = useState<string>("")
  const [isLoading, setIsLoading] = useState(true)
  const [isPaymentOpen, setIsPaymentOpen] = useState(false)
  const [isAuthOpen, setIsAuthOpen] = useState(false)
  const [paymentType, setPaymentType] = useState<"section" | "fullbook">("section")
  const [readingProgress, setReadingProgress] = useState(0)
  const [showPaywall, setShowPaywall] = useState(false)

  const { user, isLoggedIn, hasPurchased } = useStore()
  const fullBookPrice = getFullBookPrice()
  const totalSections = getTotalSectionCount()

  const hasFullBook = user?.hasFullBook || false
  const canAccess = section.isFree || hasFullBook || (isLoggedIn && hasPurchased(section.id))

  // 阅读进度追踪
  useEffect(() => {
    const handleScroll = () => {
      const scrollTop = window.scrollY
      const docHeight = document.documentElement.scrollHeight - window.innerHeight
      const progress = docHeight > 0 ? Math.min((scrollTop / docHeight) * 100, 100) : 0
      setReadingProgress(progress)

      if (progress >= 20 && !canAccess) {
        setShowPaywall(true)
      }
    }

    window.addEventListener("scroll", handleScroll)
    return () => window.removeEventListener("scroll", handleScroll)
  }, [canAccess])

  // 加载内容
  useEffect(() => {
    async function loadContent() {
      try {
        if (section.content) {
          setContent(section.content)
          setIsLoading(false)
          return
        }

        const response = await fetch(`/api/content?path=${encodeURIComponent(section.filePath)}`)
        if (response.ok) {
          const data = await response.json()
          setContent(data.content || "")
        }
      } catch (error) {
        console.error("Failed to load content:", error)
      } finally {
        setIsLoading(false)
      }
    }

    loadContent()
  }, [section.filePath, section.content])

  const handlePurchaseClick = (type: "section" | "fullbook") => {
    if (!isLoggedIn) {
      setIsAuthOpen(true)
      return
    }
    setPaymentType(type)
    setIsPaymentOpen(true)
  }

  const contentLines = content.split("\n").filter((line) => line.trim())
  const previewLineCount = Math.ceil(contentLines.length * 0.2) // 改为20%
  const previewContent = contentLines.slice(0, previewLineCount).join("\n")

  return (
    <div className="min-h-screen bg-black text-white">
      <div className="fixed top-0 left-0 right-0 z-50 h-0.5 bg-[#1c1c1e]">
        <div
          className="h-full bg-gradient-to-r from-[#00CED1] to-[#20B2AA] transition-all duration-150"
          style={{ width: `${readingProgress}%` }}
        />
      </div>

      {/* 顶部导航 */}
      <header className="sticky top-0 z-40 bg-black/80 backdrop-blur-xl border-b border-white/5">
        <div className="max-w-2xl mx-auto px-4 py-3 flex items-center justify-between">
          <button
            onClick={() => router.push("/chapters")}
            className="w-9 h-9 rounded-full bg-[#1c1c1e] flex items-center justify-center active:bg-[#2c2c2e]"
          >
            <ChevronLeft className="w-5 h-5 text-gray-400" />
          </button>
          <div className="text-center flex-1 px-4">
            {partTitle && <p className="text-[10px] text-gray-500">{partTitle}</p>}
            {chapterTitle && <p className="text-xs text-gray-400 truncate">{chapterTitle}</p>}
          </div>
          <button
            onClick={() => {
              const url = window.location.href
              navigator.clipboard.writeText(url)
              alert("链接已复制")
            }}
            className="w-9 h-9 rounded-full bg-[#1c1c1e] flex items-center justify-center active:bg-[#2c2c2e]"
          >
            <Share2 className="w-4 h-4 text-gray-400" />
          </button>
        </div>
      </header>

      {/* 阅读内容 */}
      <main className="max-w-2xl mx-auto px-5 py-8 pb-32">
        <div className="mb-8">
          <div className="flex items-center gap-2 mb-3">
            <span className="text-[#00CED1] text-sm font-medium bg-[#00CED1]/10 px-3 py-1 rounded-full">
              {section.id}
            </span>
            {section.isFree && <span className="text-xs text-[#00CED1] bg-[#00CED1]/10 px-2 py-0.5 rounded">免费</span>}
          </div>
          <h1 className="text-2xl font-bold text-white leading-tight">{section.title}</h1>
        </div>

        {isLoading ? (
          <div className="space-y-4">
            {[...Array(8)].map((_, i) => (
              <div
                key={i}
                className="h-4 bg-[#1c1c1e] rounded animate-pulse"
                style={{ width: `${Math.random() * 40 + 60}%` }}
              />
            ))}
          </div>
        ) : canAccess ? (
          // 完整内容
          <article className="text-gray-300 leading-[1.9] text-[17px]">
            {content.split("\n").map(
              (paragraph, index) =>
                paragraph.trim() && (
                  <p key={index} className="mb-6">
                    {paragraph}
                  </p>
                ),
            )}
          </article>
        ) : (
          <div>
            {/* 免费预览部分 */}
            <article className="text-gray-300 leading-[1.9] text-[17px]">
              {previewContent.split("\n").map(
                (paragraph, index) =>
                  paragraph.trim() && (
                    <p key={index} className="mb-6">
                      {paragraph}
                    </p>
                  ),
              )}
            </article>

            {showPaywall && (
              <>
                {/* 渐变遮罩 */}
                <div className="relative">
                  <div className="absolute -top-32 left-0 right-0 h-32 bg-gradient-to-t from-black to-transparent pointer-events-none" />
                </div>

                <div className="mt-8 p-6 rounded-2xl bg-gradient-to-b from-[#1c1c1e] to-[#2c2c2e] border border-[#00CED1]/20">
                  <div className="text-center">
                    <div className="w-16 h-16 mx-auto mb-4 rounded-2xl bg-[#00CED1]/10 flex items-center justify-center">
                      <Lock className="w-8 h-8 text-[#00CED1]" />
                    </div>
                    <h3 className="text-xl font-semibold text-white mb-2">解锁完整内容</h3>
                    <p className="text-gray-400 text-sm mb-6">
                      已阅读20%，{isLoggedIn ? "购买后继续阅读" : "登录并购买后继续阅读"}
                    </p>

                    {/* 购买选项 */}
                    <div className="space-y-3 mb-6">
                      <button
                        onClick={() => handlePurchaseClick("section")}
                        className="w-full py-3.5 px-6 rounded-xl bg-[#2c2c2e] border border-white/10 text-white font-medium active:scale-[0.98] transition-transform"
                      >
                        <div className="flex items-center justify-between">
                          <span>购买本章</span>
                          <span className="text-[#00CED1]">¥{section.price}</span>
                        </div>
                      </button>

                      <button
                        onClick={() => handlePurchaseClick("fullbook")}
                        className="w-full py-3.5 px-6 rounded-xl bg-gradient-to-r from-[#00CED1] to-[#20B2AA] text-white font-medium active:scale-[0.98] transition-transform shadow-lg shadow-[#00CED1]/20"
                      >
                        <div className="flex items-center justify-between">
                          <div className="flex items-center gap-2">
                            <Sparkles className="w-4 h-4" />
                            <span>解锁全部 {totalSections} 章</span>
                          </div>
                          <div className="text-right">
                            <span className="text-lg font-bold">¥{fullBookPrice}</span>
                            <span className="text-xs ml-1 opacity-70">省82%</span>
                          </div>
                        </div>
                      </button>
                    </div>

                    <p className="text-xs text-gray-500">分享给好友购买，你可获得90%佣金</p>
                  </div>
                </div>
              </>
            )}
          </div>
        )}
      </main>

      {/* 登录弹窗 */}
      <AuthModal isOpen={isAuthOpen} onClose={() => setIsAuthOpen(false)} />

      {/* 支付弹窗 */}
      <PaymentModal
        isOpen={isPaymentOpen}
        onClose={() => setIsPaymentOpen(false)}
        type={paymentType}
        sectionId={section.id}
        sectionTitle={section.title}
        amount={paymentType === "section" ? section.price : fullBookPrice}
        onSuccess={() => window.location.reload()}
      />
    </div>
  )
}