"use client"

import { useState, useEffect } from "react"
import { X, Lock, Sparkles } from "lucide-react"
import { useStore } from "@/lib/store"
import { getFullBookPrice } from "@/lib/book-data"

interface ReadingModalProps {
  section: { id: string; title: string; filePath: string }
  onClose: () => void
  onPurchase: (sectionId: string, title: string, price: number) => void
}

export function ReadingModal({ section, onClose, onPurchase }: ReadingModalProps) {
  const [content, setContent] = useState("")
  const [isLoading, setIsLoading] = useState(true)
  const { isLoggedIn, hasPurchased } = useStore()

  const isFree = section.id === "preface" || section.id === "epilogue"
  const canAccess = isFree || (isLoggedIn && hasPurchased(section.id))
  const fullBookPrice = getFullBookPrice()

  useEffect(() => {
    async function loadContent() {
      try {
        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])

  // 计算显示内容
  const displayContent = canAccess ? content : content.slice(0, Math.floor(content.length * 0.3))
  const showPaywall = !canAccess && content.length > 0

  return (
    <div className="fixed inset-0 z-50 bg-black/90 modal-overlay">
      <div className="h-full flex flex-col">
        {/* Header */}
        <header className="flex-shrink-0 glass-nav px-4 py-3 flex items-center justify-between safe-top">
          <button
            onClick={onClose}
            className="w-9 h-9 rounded-full bg-[var(--app-bg-secondary)] flex items-center justify-center touch-feedback"
          >
            <X className="w-5 h-5" />
          </button>
          <h1 className="text-white font-semibold text-sm truncate flex-1 mx-4 text-center">{section.title}</h1>
          <div className="w-9" />
        </header>

        {/* Content */}
        <div className="flex-1 overflow-y-auto scrollbar-hide">
          <div className="max-w-2xl mx-auto px-5 py-6">
            {isLoading ? (
              <div className="space-y-4">
                {[...Array(10)].map((_, i) => (
                  <div key={i} className="skeleton h-4 rounded" style={{ width: `${Math.random() * 40 + 60}%` }} />
                ))}
              </div>
            ) : (
              <>
                <article className="book-content relative">
                  <div className="text-[var(--app-text-secondary)] leading-[1.9] text-[17px]">
                    {displayContent.split("\n").map(
                      (paragraph, index) =>
                        paragraph.trim() && (
                          <p key={index} className="mb-6 text-justify">
                            {paragraph}
                          </p>
                        ),
                    )}
                  </div>

                  {/* 付费墙渐变 */}
                  {showPaywall && (
                    <div className="absolute bottom-0 left-0 right-0 h-48 bg-gradient-to-t from-black to-transparent" />
                  )}
                </article>

                {/* 付费提示 - 在阅读中途触发 */}
                {showPaywall && (
                  <div className="mt-8 glass-card-heavy p-8 text-center">
                    <div className="w-16 h-16 mx-auto mb-4 rounded-2xl bg-[var(--app-bg-secondary)] flex items-center justify-center">
                      <Lock className="w-8 h-8 text-[var(--app-text-tertiary)]" />
                    </div>
                    <h3 className="text-xl font-semibold mb-2">解锁完整内容</h3>
                    <p className="text-[var(--app-text-secondary)] mb-6">您已阅读30%，解锁后可阅读完整内容</p>

                    <div className="flex flex-col gap-3">
                      <button
                        onClick={() => onPurchase(section.id, section.title, 1)}
                        className="btn-ios-secondary py-3"
                      >
                        购买本节 ¥1
                      </button>
                      <button
                        onClick={() => onPurchase(section.id, section.title, fullBookPrice)}
                        className="btn-ios py-3 glow flex items-center justify-center gap-2"
                      >
                        <Sparkles className="w-4 h-4" />
                        购买全书 ¥{fullBookPrice} 省82%
                      </button>
                    </div>

                    <p className="text-[var(--app-text-tertiary)] text-xs mt-4">
                      分享给好友，他人购买你可获得 90% 返利
                    </p>
                  </div>
                )}
              </>
            )}
          </div>
        </div>
      </div>
    </div>
  )
}