'use client'

import { useState } from 'react'
import { useRouter } from 'next/navigation'

// 背景装饰黑话词条
const BUZZ_WORDS = [
  '对齐', '赋能', '闭环', '拉通', '复盘', '抓手', '颗粒度',
  '落地', '沉淀', '方法论', '协同', '降本增效', '去重复化',
  'OKR', 'KPI', 'P8', 'P9', '内卷', '高优', '紧急拉会',
  'JIRA', '绩效', 'HC冻结', '组织架构调整', '并行推进',
  '向上管理', '自驱力', '全链路', '数据驱动', '业务增长',
]

type DifficultyLevel = 'easy' | 'normal' | 'hard'

const DIFFICULTY_OPTIONS: {
  key: DifficultyLevel
  label: string
  desc: string
  color: string
  borderColor: string
  glowColor: string
}[] = [
  {
    key: 'easy',
    label: '简单',
    desc: '带薪摸鱼，准点下班',
    color: '#22C55E',
    borderColor: '#16a34a',
    glowColor: 'rgba(34,197,94,0.35)',
  },
  {
    key: 'normal',
    label: '普通',
    desc: '常规打工，偶有加班',
    color: '#3B82F6',
    borderColor: '#2563eb',
    glowColor: 'rgba(59,130,246,0.35)',
  },
  {
    key: 'hard',
    label: '困难',
    desc: '地狱模式，007全开',
    color: '#EF4444',
    borderColor: '#dc2626',
    glowColor: 'rgba(239,68,68,0.35)',
  },
]

export default function GameCover() {
  const [selectedDifficulty, setSelectedDifficulty] = useState<DifficultyLevel>('normal')
  const router = useRouter()

  const handleStart = () => {
    if (typeof window !== 'undefined') {
      localStorage.setItem('game-difficulty', selectedDifficulty)
    }
    router.push('/game')
  }

  return (
    <main
      className="crt-overlay relative w-full min-h-screen flex flex-col items-center justify-center overflow-hidden"
      style={{
        backgroundColor: '#0F0F23',
        backgroundImage: 'url(/game-assets/cover-bg.png)',
        backgroundSize: 'cover',
        backgroundPosition: 'center',
      }}
    >
      {/* 深色叠加层 */}
      <div className="absolute inset-0" style={{ backgroundColor: 'rgba(10,10,30,0.72)' }} />

      {/* CRT 流动扫描线 */}
      <div className="game-cover-scanline" />

      {/* 背景装饰：大厂黑话浮字 */}
      <div
        className="absolute inset-0 pointer-events-none select-none overflow-hidden"
        aria-hidden="true"
      >
        {BUZZ_WORDS.map((word, i) => {
          const top = (i * 37 + 7) % 95
          const left = (i * 53 + 13) % 90
          const size = 12 + (i % 5) * 4
          const rotation = (i % 2 === 0 ? 1 : -1) * (5 + (i % 15))
          return (
            <span
              key={word}
              className="font-vt323 absolute"
              style={{
                top: `${top}%`,
                left: `${left}%`,
                fontSize: `${size}px`,
                color: '#A78BFA',
                opacity: 0.07 + (i % 4) * 0.02,
                transform: `rotate(${rotation}deg)`,
                whiteSpace: 'nowrap',
              }}
            >
              {word}
            </span>
          )
        })}
      </div>

      {/* 中央主卡片 */}
      <div
        className="neon-border relative z-10 flex flex-col items-center gap-6 px-10 py-12 rounded-2xl"
        style={{
          backgroundColor: 'rgba(15, 15, 35, 0.85)',
          backdropFilter: 'blur(12px)',
          maxWidth: '600px',
          width: '90%',
        }}
      >
        {/* 游戏主标题 */}
        <h1
          className="neon-title font-pixel text-center leading-relaxed"
          style={{ fontSize: 'clamp(18px, 4vw, 28px)', color: '#A78BFA' }}
        >
          大厂保卫战
        </h1>

        {/* 副标题 */}
        <p
          className="font-vt323 text-center"
          style={{ fontSize: '28px', color: '#E2E8F0', letterSpacing: '0.1em' }}
        >
          最后的打工人
        </p>

        {/* 英文副标 */}
        <p
          className="font-pixel text-center"
          style={{ fontSize: '10px', color: '#7C3AED', letterSpacing: '0.3em' }}
        >
          THE LAST GRINDER
        </p>

        {/* 分割线 */}
        <div
          className="w-full"
          style={{ height: '1px', background: 'linear-gradient(90deg, transparent, #7C3AED, transparent)' }}
        />

        {/* 描述文字 */}
        <p
          className="font-vt323 text-center"
          style={{ fontSize: '22px', color: '#A78BFA', lineHeight: 1.6 }}
        >
          保住 KPI，战胜空降 VP
          <br />
          部署打工人防线，捍卫最后的 HC
        </p>

        {/* 难度选择 */}
        <div className="w-full">
          <p
            className="font-pixel text-center mb-3"
            style={{ fontSize: '9px', color: '#7C3AED', letterSpacing: '0.2em' }}
          >
            选择难度
          </p>
          <div className="flex gap-3 justify-center">
            {DIFFICULTY_OPTIONS.map(opt => {
              const isSelected = selectedDifficulty === opt.key
              return (
                <button
                  key={opt.key}
                  onClick={() => setSelectedDifficulty(opt.key)}
                  style={{
                    flex: 1,
                    padding: '10px 8px',
                    backgroundColor: isSelected ? `rgba(${opt.key === 'easy' ? '34,197,94' : opt.key === 'normal' ? '59,130,246' : '239,68,68'},0.15)` : '#0F1B2D',
                    border: `2px solid ${isSelected ? opt.color : '#1e3a5f'}`,
                    borderRadius: '10px',
                    cursor: 'pointer',
                    transition: 'all 0.15s ease',
                    boxShadow: isSelected ? `0 0 16px ${opt.glowColor}` : 'none',
                    transform: isSelected ? 'translateY(-2px)' : 'none',
                  }}
                >
                  <div
                    className="font-vt323"
                    style={{ fontSize: '22px', color: opt.color, marginBottom: '2px' }}
                  >
                    {opt.label}
                  </div>
                  <div
                    className="font-vt323"
                    style={{ fontSize: '13px', color: '#9CA3AF', lineHeight: 1.2 }}
                  >
                    {opt.desc}
                  </div>
                </button>
              )
            })}
          </div>
        </div>

        {/* 开始游戏按钮 */}
        <button
          onClick={handleStart}
          className="font-pixel text-white rounded-lg transition-all duration-200 cursor-pointer"
          style={{
            backgroundColor: '#F43F5E',
            padding: '14px 32px',
            fontSize: '12px',
            letterSpacing: '0.1em',
            boxShadow: '0 0 20px rgba(244, 63, 94, 0.4)',
            border: 'none',
          }}
          onMouseEnter={e => {
            const el = e.currentTarget as HTMLButtonElement
            el.style.opacity = '0.9'
            el.style.transform = 'translateY(-2px)'
            el.style.boxShadow = '0 0 30px rgba(244, 63, 94, 0.6)'
          }}
          onMouseLeave={e => {
            const el = e.currentTarget as HTMLButtonElement
            el.style.opacity = '1'
            el.style.transform = 'translateY(0)'
            el.style.boxShadow = '0 0 20px rgba(244, 63, 94, 0.4)'
          }}
        >
          开始游戏
        </button>

        {/* 提示文字 */}
        <p
          className="font-vt323 text-center"
          style={{ fontSize: '16px', color: '#7C3AED', opacity: 0.7 }}
        >
          PRESS START
        </p>
      </div>

      {/* 底部版权 */}
      <footer
        className="absolute bottom-4 left-0 right-0 text-center font-pixel pointer-events-none"
        style={{ fontSize: '8px', color: '#7C3AED', opacity: 0.5, letterSpacing: '0.15em' }}
      >
        © 2026 大厂保卫战 &nbsp;|&nbsp; ALL YOUR KPI ARE BELONG TO US
      </footer>
    </main>
  )
}