"use client"

import { useState } from "react"
import { useRouter } from "next/navigation"
import { ChevronRight, Lock, Unlock, Book, BookOpen, Home, List, Sparkles, User, Users, Zap, Crown } from "lucide-react"
import { useStore } from "@/lib/store"
import { bookData, getTotalSectionCount, specialSections, getPremiumBookPrice, getExtraSectionsCount, BASE_SECTIONS_COUNT } from "@/lib/book-data"

export default function ChaptersPage() {
  const router = useRouter()
  const { user, hasPurchased } = useStore()
  const [expandedPart, setExpandedPart] = useState<string | null>("part-1")
  const [bookVersion, setBookVersion] = useState<"basic" | "premium">("basic")
  const [showPremiumTab, setShowPremiumTab] = useState(false) // 控制是否显示最新完整版标签

  const totalSections = getTotalSectionCount()
  const hasFullBook = user?.hasFullBook || false
  const premiumPrice = getPremiumBookPrice()
  const extraSections = getExtraSectionsCount()

  const handleSectionClick = (sectionId: string) => {
    router.push(`/read/${sectionId}`)
  }

  return (
    <div className="min-h-screen bg-black text-white pb-24">
      <header className="sticky top-0 z-40 bg-black/90 backdrop-blur-xl border-b border-white/5">
        <div className="px-4 py-3 flex items-center justify-center">
          <h1 className="text-lg font-semibold text-[#00CED1]">目录</h1>
        </div>
      </header>

      <div className="mx-4 mt-4 p-4 rounded-2xl bg-gradient-to-br from-[#1c1c1e] to-[#2c2c2e] border border-[#00CED1]/20">
        <div className="flex items-center gap-3">
          <div className="w-12 h-12 rounded-xl bg-gradient-to-br from-[#00CED1] to-[#20B2AA] flex items-center justify-center">
            <Book className="w-6 h-6 text-white" />
          </div>
          <div className="flex-1">
            <h2 className="text-white font-semibold">一场SOUL的创业实验场</h2>
            <p className="text-gray-500 text-xs mt-0.5">来自Soul派对房的真实商业故事</p>
          </div>
          <div className="text-right">
            <div className="text-xl font-bold text-[#00CED1]">{totalSections}</div>
            <div className="text-[10px] text-gray-500">章节</div>
          </div>
        </div>
      </div>
      
      {/* 版本标签切换 - 仅在showPremiumTab为true时显示 */}
      {showPremiumTab && extraSections > 0 && (
        <div className="mx-4 mt-3 flex gap-2">
          <button
            onClick={() => setBookVersion("basic")}
            className={`flex-1 py-2.5 rounded-xl text-sm font-medium transition-all ${
              bookVersion === "basic"
                ? "bg-[#00CED1]/20 text-[#00CED1] border border-[#00CED1]/30"
                : "bg-[#1c1c1e] text-white/60 border border-white/5"
            }`}
          >
            基础版 ¥9.9
          </button>
          <button
            onClick={() => setBookVersion("premium")}
            className={`flex-1 py-2.5 rounded-xl text-sm font-medium transition-all flex items-center justify-center gap-1 ${
              bookVersion === "premium"
                ? "bg-[#FFD700]/20 text-[#FFD700] border border-[#FFD700]/30"
                : "bg-[#1c1c1e] text-white/60 border border-white/5"
            }`}
          >
            <Crown className="w-4 h-4" />
            最新版 ¥{premiumPrice.toFixed(1)}
          </button>
        </div>
      )}

      {/* 目录内容 */}
      <main className="px-4 py-4">
        <button
          onClick={() => handleSectionClick("preface")}
          className="w-full mb-3 p-3 rounded-xl bg-[#1c1c1e] flex items-center justify-between active:bg-[#2c2c2e] transition-colors border border-white/5"
        >
          <div className="flex items-center gap-3">
            <div className="w-8 h-8 rounded-lg bg-[#00CED1]/20 flex items-center justify-center">
              <BookOpen className="w-4 h-4 text-[#00CED1]" />
            </div>
            <span className="text-sm font-medium text-white">序言｜为什么我每天早上6点在Soul开播?</span>
          </div>
          <div className="flex items-center gap-2">
            <span className="text-xs text-[#00CED1]">免费</span>
            <ChevronRight className="w-4 h-4 text-gray-500" />
          </div>
        </button>

        {bookData.map((part) => (
          <div key={part.id} className="mb-3">
            <button
              onClick={() => setExpandedPart(expandedPart === part.id ? null : part.id)}
              className="w-full p-3 rounded-xl bg-[#1c1c1e] flex items-center justify-between active:bg-[#2c2c2e] transition-colors border border-white/5"
            >
              <div className="flex items-center gap-3">
                <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-[#00CED1] to-[#20B2AA] flex items-center justify-center text-sm font-bold text-white">
                  {part.number}
                </div>
                <div className="text-left">
                  <div className="text-sm font-semibold text-white">{part.title}</div>
                  <div className="text-[10px] text-gray-500">{part.subtitle}</div>
                </div>
              </div>
              <div className="flex items-center gap-2">
                <span className="text-xs text-gray-500">
                  {part.chapters.reduce((acc, ch) => acc + ch.sections.length, 0)}章
                </span>
                <ChevronRight
                  className={`w-4 h-4 text-gray-500 transition-transform ${expandedPart === part.id ? "rotate-90" : ""}`}
                />
              </div>
            </button>

            {expandedPart === part.id && (
              <div className="mt-2 ml-2 space-y-1">
                {part.chapters.map((chapter) => (
                  <div key={chapter.id} className="rounded-lg bg-[#1c1c1e]/50 overflow-hidden border border-white/5">
                    <div className="px-3 py-2 text-xs font-medium text-gray-400 border-b border-white/5">
                      {chapter.title}
                    </div>
                    {chapter.sections.map((section) => {
                      const isPurchased = hasFullBook || hasPurchased(section.id)
                      const canRead = section.isFree || isPurchased

                      return (
                        <button
                          key={section.id}
                          onClick={() => handleSectionClick(section.id)}
                          className="w-full px-3 py-2.5 flex items-center justify-between border-b border-white/5 last:border-0 active:bg-white/5 transition-colors"
                        >
                          <div className="flex items-center gap-2 flex-1 min-w-0">
                            {canRead ? (
                              <Unlock className="w-3.5 h-3.5 text-[#00CED1] flex-shrink-0" />
                            ) : (
                              <Lock className="w-3.5 h-3.5 text-gray-500 flex-shrink-0" />
                            )}
                            <span className={`text-xs truncate ${canRead ? "text-white" : "text-gray-400"}`}>
                              {section.id} {section.title}
                            </span>
                          </div>
                          <div className="flex items-center gap-2 flex-shrink-0 ml-2">
                            {section.isFree ? (
                              <span className="text-[10px] text-[#00CED1] px-1.5 py-0.5 rounded bg-[#00CED1]/10">
                                免费
                              </span>
                            ) : isPurchased ? (
                              <span className="text-[10px] text-[#00CED1]">已购</span>
                            ) : (
                              <span className="text-[10px] text-gray-500">¥{section.price}</span>
                            )}
                            <ChevronRight className="w-3.5 h-3.5 text-gray-600" />
                          </div>
                        </button>
                      )
                    })}
                  </div>
                ))}
              </div>
            )}
          </div>
        ))}

        <button
          onClick={() => handleSectionClick("epilogue")}
          className="w-full mb-3 p-3 rounded-xl bg-[#1c1c1e] flex items-center justify-between active:bg-[#2c2c2e] transition-colors border border-white/5"
        >
          <div className="flex items-center gap-3">
            <div className="w-8 h-8 rounded-lg bg-[#00CED1]/20 flex items-center justify-center">
              <BookOpen className="w-4 h-4 text-[#00CED1]" />
            </div>
            <span className="text-sm font-medium text-white">尾声｜这本书的真实目的</span>
          </div>
          <div className="flex items-center gap-2">
            <span className="text-xs text-[#00CED1]">免费</span>
            <ChevronRight className="w-4 h-4 text-gray-500" />
          </div>
        </button>

        {/* 附录 */}
        <div className="mb-3 p-3 rounded-xl bg-[#1c1c1e] border border-white/5">
          <div className="text-xs font-medium text-gray-400 mb-2">附录</div>
          {specialSections.appendix.map((item) => (
            <button
              key={item.id}
              onClick={() => handleSectionClick(item.id)}
              className="w-full py-2 flex items-center justify-between border-b border-white/5 last:border-0 active:bg-white/5"
            >
              <span className="text-xs text-gray-300">{item.title}</span>
              <ChevronRight className="w-3.5 h-3.5 text-gray-600" />
            </button>
          ))}
        </div>
      </main>

      <nav className="fixed bottom-0 left-0 right-0 bg-[#1c1c1e]/95 backdrop-blur-xl border-t border-white/5 pb-safe-bottom">
        <div className="px-4 py-2">
          <div className="flex items-center justify-around">
            <button onClick={() => router.push("/")} className="flex flex-col items-center py-2 px-4">
              <Home className="w-5 h-5 text-gray-500 mb-1" />
              <span className="text-gray-500 text-xs">首页</span>
            </button>
            <button className="flex flex-col items-center py-2 px-4">
              <List className="w-5 h-5 text-[#00CED1] mb-1" />
              <span className="text-[#00CED1] text-xs font-medium">目录</span>
            </button>
            {/* 找伙伴按钮 */}
            <button onClick={() => router.push("/match")} className="flex flex-col items-center py-2 px-6 -mt-4">
              <div className="w-14 h-14 rounded-full bg-gradient-to-br from-[#00CED1] to-[#20B2AA] flex items-center justify-center shadow-lg shadow-[#00CED1]/30">
                <Users className="w-7 h-7 text-white" />
              </div>
              <span className="text-gray-500 text-xs mt-1">找伙伴</span>
            </button>
            <button onClick={() => router.push("/my")} className="flex flex-col items-center py-2 px-4">
              <User className="w-5 h-5 text-gray-500 mb-1" />
              <span className="text-gray-500 text-xs">我的</span>
            </button>
          </div>
        </div>
      </nav>
    </div>
  )
}