import { useParams, Link, useLocation, useNavigate } from 'react-router-dom'
import { motion } from 'framer-motion'
import { ArrowLeft, ArrowRight, FileText, Wrench, FileOutput, LayoutGrid, Workflow, Eye, EyeOff, Info } from 'lucide-react'
import { getProcessDetail, processes } from '@/data'
import { useState, useEffect } from 'react'

type IttoSection = 'inputs' | 'tools' | 'outputs'
const STORAGE_KEY = 'ittoview:process-detail:itto-visibility'

export function ProcessDetailPage() {
  const { id } = useParams()
  const location = useLocation()
  const navigate = useNavigate()
  const processDetail = id ? getProcessDetail(id) : null

  // ITTO 显示/隐藏状态管理
  const [visible, setVisible] = useState<Record<IttoSection, boolean>>(() => {
    const defaultVisible = { inputs: true, tools: true, outputs: true }
    try {
      const raw = localStorage.getItem(STORAGE_KEY)
      if (!raw) return defaultVisible
      const parsed = JSON.parse(raw)
      // 数据校验：确保是对象且包含正确的键
      if (typeof parsed !== 'object' || parsed === null) return defaultVisible
      return {
        inputs: typeof parsed.inputs === 'boolean' ? parsed.inputs : true,
        tools: typeof parsed.tools === 'boolean' ? parsed.tools : true,
        outputs: typeof parsed.outputs === 'boolean' ? parsed.outputs : true,
      }
    } catch {
      return defaultVisible
    }
  })

  // 持久化状态
  useEffect(() => {
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(visible))
    } catch (error) {
      // 在隐私模式或受限环境下，localStorage 可能不可用
      console.warn('无法保存 ITTO 显示状态:', error)
    }
  }, [visible])

  const toggleSection = (key: IttoSection) => {
    setVisible(prev => ({ ...prev, [key]: !prev[key] }))
  }

  const allVisible = Object.values(visible).every(Boolean)
  const toggleAll = () => {
    const newState = !allVisible
    setVisible({ inputs: newState, tools: newState, outputs: newState })
  }

  const fromMatrix = location.state?.from === 'matrix'
  const fromRoadmap = location.state?.from === 'roadmap'

  if (!processDetail) {
    return (
      <div className="flex flex-col items-center justify-center py-20">
        <h2 className="text-xl font-semibold text-gray-900 dark:text-white mb-4">未找到该过程</h2>
        <Link to="/knowledge-areas" className="text-indigo-600 dark:text-indigo-400 hover:underline">
          返回知识领域
        </Link>
      </div>
    )
  }

  const ka = processDetail.knowledgeArea
  const pg = processDetail.processGroup
  const purpose = (processDetail as any).purpose

  const currentIndex = processes.findIndex(p => p.id === id)
  const prevProcess = currentIndex > 0 ? processes[currentIndex - 1] : null
  const nextProcess = currentIndex < processes.length - 1 ? processes[currentIndex + 1] : null

  return (
    <div className="space-y-4">
      {/* 返回按钮 + 面包屑 */}
      <div className="flex items-center gap-3 text-sm">
        {fromMatrix && (
          <button
            onClick={() => navigate('/process-matrix')}
            className="flex items-center gap-1.5 px-2.5 py-1 rounded-lg bg-indigo-50 dark:bg-indigo-900/30 text-indigo-600 dark:text-indigo-400 hover:bg-indigo-100 dark:hover:bg-indigo-900/50 transition-colors font-medium"
          >
            <LayoutGrid size={14} />
            返回矩阵
          </button>
        )}
        {fromRoadmap && (
          <button
            onClick={() => navigate('/process-roadmap')}
            className="flex items-center gap-1.5 px-2.5 py-1 rounded-lg bg-amber-50 dark:bg-amber-900/30 text-amber-700 dark:text-amber-300 hover:bg-amber-100 dark:hover:bg-amber-900/50 transition-colors font-medium"
          >
            <Workflow size={14} />
            返回总览图
          </button>
        )}
        <nav className="flex items-center gap-1.5 text-gray-500 dark:text-gray-400">
          <Link to="/knowledge-areas" className="hover:text-indigo-600 dark:hover:text-indigo-400">知识领域</Link>
          <span>/</span>
          {ka && (
            <>
              <Link to={`/knowledge-areas/${ka.id}`} className="hover:text-indigo-600 dark:hover:text-indigo-400">{ka.name}</Link>
              <span>/</span>
            </>
          )}
          <span className="text-gray-900 dark:text-white">{processDetail.name}</span>
        </nav>
      </div>

      {/* 过程标题 - 更紧凑 */}
      <motion.div
        initial={{ opacity: 0, y: -10 }}
        animate={{ opacity: 1, y: 0 }}
        className="rounded-xl p-4 bg-white dark:bg-gray-800 shadow-sm border border-gray-100 dark:border-gray-700"
      >
        <div className="flex items-center gap-3">
          <div
            className="flex h-12 w-12 items-center justify-center rounded-lg text-white font-bold text-lg shrink-0"
            style={{ backgroundColor: ka?.color || '#6366F1' }}
          >
            {processDetail.code}
          </div>
          <div className="flex-1 min-w-0">
            <h1 className="text-xl font-bold text-gray-900 dark:text-white truncate">{processDetail.name}</h1>
            <p className="text-sm text-gray-500 dark:text-gray-400">{processDetail.nameEn}</p>
          </div>
          <div className="flex items-center gap-2 shrink-0">
            {ka && (
              <span className="px-2.5 py-1 rounded-full text-xs font-medium text-white" style={{ backgroundColor: ka.color }}>
                {ka.name}
              </span>
            )}
            {pg && (
              <span className="px-2.5 py-1 rounded-full text-xs font-medium text-white" style={{ backgroundColor: pg.color }}>
                {pg.name}
              </span>
            )}
          </div>
        </div>
      </motion.div>

      {/* 主要作用 */}
      {purpose && (
        <motion.div
          initial={{ opacity: 0, y: 10 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ delay: 0.05 }}
          className="bg-indigo-50 dark:bg-indigo-900/20 rounded-xl p-4 border border-indigo-100 dark:border-indigo-800"
        >
          <div className="flex items-center gap-2 mb-2">
            <Info size={16} className="text-indigo-600 dark:text-indigo-400 shrink-0" />
            <h3 className="text-sm font-semibold text-indigo-900 dark:text-indigo-100">主要作用</h3>
          </div>
          <p className="text-sm text-indigo-800 dark:text-indigo-200 leading-relaxed">{purpose}</p>
        </motion.div>
      )}

      {/* 全局控制按钮 */}
      <motion.div
        initial={{ opacity: 0 }}
        animate={{ opacity: 1 }}
        transition={{ delay: 0.08 }}
        className="flex justify-end"
      >
        <button
          type="button"
          onClick={toggleAll}
          aria-label={allVisible ? '隐藏所有 ITTO 内容' : '显示所有 ITTO 内容'}
          aria-pressed={allVisible}
          className="flex items-center gap-2 px-3 py-1.5 rounded-lg bg-indigo-50 dark:bg-indigo-900/30 text-indigo-700 dark:text-indigo-300 hover:bg-indigo-100 dark:hover:bg-indigo-900/50 transition-colors text-sm font-medium"
        >
          {allVisible ? <EyeOff size={16} /> : <Eye size={16} />}
          <span>{allVisible ? '全部隐藏' : '全部显示'}</span>
        </button>
      </motion.div>

      {/* ITTO表格 - 更紧凑 */}
      <motion.div
        initial={{ opacity: 0, y: 10 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ delay: 0.1 }}
        className="grid lg:grid-cols-3 gap-4"
      >
        {/* 输入 */}
        <div className="bg-white dark:bg-gray-800 rounded-xl shadow-sm border border-gray-100 dark:border-gray-700 overflow-hidden">
          <div className="flex items-center justify-between px-3 py-2 bg-blue-50 dark:bg-blue-900/30 border-b border-blue-100 dark:border-blue-800">
            <div className="flex items-center gap-2">
              <FileText size={16} className="text-blue-600 dark:text-blue-400" />
              <h3 className="font-semibold text-blue-900 dark:text-blue-100 text-sm">输入 ({processDetail.inputs.length})</h3>
            </div>
            <button
              type="button"
              onClick={() => toggleSection('inputs')}
              aria-label={visible.inputs ? '隐藏输入' : '显示输入'}
              aria-pressed={visible.inputs}
              className="flex items-center gap-1.5 px-2 py-1 rounded-md text-xs font-medium text-blue-700 dark:text-blue-300 hover:bg-blue-100 dark:hover:bg-blue-900/50 transition-colors"
            >
              {visible.inputs ? <EyeOff size={14} /> : <Eye size={14} />}
              <span>{visible.inputs ? '隐藏' : '显示'}</span>
            </button>
          </div>
          <motion.div
            animate={{
              maxHeight: visible.inputs ? 2000 : 0,
              opacity: visible.inputs ? 1 : 0
            }}
            initial={false}
            transition={{ duration: 0.3, ease: 'easeInOut' }}
            style={{ overflow: 'hidden' }}
          >
            {visible.inputs ? (
              <ul className="divide-y divide-gray-100 dark:divide-gray-700">
                {processDetail.inputDetails?.map((inputDetail: any) => {
                  const hasDetail = inputDetail.detail && inputDetail.detail.length > 0
                  return (
                    <li key={inputDetail.id} className="px-3 py-2 hover:bg-gray-50 dark:hover:bg-gray-700/50 transition-colors">
                      <div className="font-medium text-gray-900 dark:text-white text-sm">{inputDetail.name || inputDetail.id}</div>
                      {inputDetail.nameEn && <div className="text-xs text-gray-500 dark:text-gray-400">{inputDetail.nameEn}</div>}
                      {hasDetail && (
                        <div className="mt-1.5 text-xs text-gray-600 dark:text-gray-400">
                          {inputDetail.detail.map((item: any, idx: number) => (
                            <span key={item.id || idx}>
                              {item.label}
                              {idx < inputDetail.detail.length - 1 && '、'}
                            </span>
                          ))}
                        </div>
                      )}
                      {inputDetail.note && (
                        <div className="mt-1.5 text-xs text-gray-500 dark:text-gray-400 italic">
                          💡 {inputDetail.note}
                        </div>
                      )}
                    </li>
                  )
                })}
              </ul>
            ) : (
              <div className="h-0" />
            )}
          </motion.div>
        </div>

        {/* 工具与技术 */}
        <div className="bg-white dark:bg-gray-800 rounded-xl shadow-sm border border-gray-100 dark:border-gray-700 overflow-hidden">
          <div className="flex items-center justify-between px-3 py-2 bg-amber-50 dark:bg-amber-900/30 border-b border-amber-100 dark:border-amber-800">
            <div className="flex items-center gap-2">
              <Wrench size={16} className="text-amber-600 dark:text-amber-400" />
              <h3 className="font-semibold text-amber-900 dark:text-amber-100 text-sm">工具与技术 ({processDetail.tools.length})</h3>
            </div>
            <button
              type="button"
              onClick={() => toggleSection('tools')}
              aria-label={visible.tools ? '隐藏工具与技术' : '显示工具与技术'}
              aria-pressed={visible.tools}
              className="flex items-center gap-1.5 px-2 py-1 rounded-md text-xs font-medium text-amber-700 dark:text-amber-300 hover:bg-amber-100 dark:hover:bg-amber-900/50 transition-colors"
            >
              {visible.tools ? <EyeOff size={14} /> : <Eye size={14} />}
              <span>{visible.tools ? '隐藏' : '显示'}</span>
            </button>
          </div>
          <motion.div
            animate={{
              maxHeight: visible.tools ? 2000 : 0,
              opacity: visible.tools ? 1 : 0
            }}
            initial={false}
            transition={{ duration: 0.3, ease: 'easeInOut' }}
            style={{ overflow: 'hidden' }}
          >
            {visible.tools ? (
              <ul className="divide-y divide-gray-100 dark:divide-gray-700">
                {processDetail.toolDetails?.map((toolDetail: any) => {
                  const hasDetail = toolDetail.detail && toolDetail.detail.length > 0
                  return (
                    <li key={toolDetail.id} className="px-3 py-2 hover:bg-gray-50 dark:hover:bg-gray-700/50 transition-colors">
                      <div className="font-medium text-gray-900 dark:text-white text-sm">{toolDetail.name || toolDetail.id}</div>
                      {toolDetail.nameEn && <div className="text-xs text-gray-500 dark:text-gray-400">{toolDetail.nameEn}</div>}
                      {hasDetail && (
                        <div className="mt-1.5 text-xs text-gray-600 dark:text-gray-400">
                          {toolDetail.detail.map((item: any, idx: number) => (
                            <span key={item.id || idx}>
                              {item.label}
                              {idx < toolDetail.detail.length - 1 && '、'}
                            </span>
                          ))}
                        </div>
                      )}
                      {toolDetail.note && (
                        <div className="mt-1.5 text-xs text-gray-500 dark:text-gray-400 italic">
                          💡 {toolDetail.note}
                        </div>
                      )}
                    </li>
                  )
                })}
              </ul>
            ) : (
              <div className="h-0" />
            )}
          </motion.div>
        </div>

        {/* 输出 */}
        <div className="bg-white dark:bg-gray-800 rounded-xl shadow-sm border border-gray-100 dark:border-gray-700 overflow-hidden">
          <div className="flex items-center justify-between px-3 py-2 bg-emerald-50 dark:bg-emerald-900/30 border-b border-emerald-100 dark:border-emerald-800">
            <div className="flex items-center gap-2">
              <FileOutput size={16} className="text-emerald-600 dark:text-emerald-400" />
              <h3 className="font-semibold text-emerald-900 dark:text-emerald-100 text-sm">输出 ({processDetail.outputs.length})</h3>
            </div>
            <button
              type="button"
              onClick={() => toggleSection('outputs')}
              aria-label={visible.outputs ? '隐藏输出' : '显示输出'}
              aria-pressed={visible.outputs}
              className="flex items-center gap-1.5 px-2 py-1 rounded-md text-xs font-medium text-emerald-700 dark:text-emerald-300 hover:bg-emerald-100 dark:hover:bg-emerald-900/50 transition-colors"
            >
              {visible.outputs ? <EyeOff size={14} /> : <Eye size={14} />}
              <span>{visible.outputs ? '隐藏' : '显示'}</span>
            </button>
          </div>
          <motion.div
            animate={{
              maxHeight: visible.outputs ? 2000 : 0,
              opacity: visible.outputs ? 1 : 0
            }}
            initial={false}
            transition={{ duration: 0.3, ease: 'easeInOut' }}
            style={{ overflow: 'hidden' }}
          >
            {visible.outputs ? (
              <ul className="divide-y divide-gray-100 dark:divide-gray-700">
                {processDetail.outputDetails?.map((outputDetail: any) => {
                  const hasDetail = outputDetail.detail && outputDetail.detail.length > 0
                  return (
                    <li key={outputDetail.id} className="px-3 py-2 hover:bg-gray-50 dark:hover:bg-gray-700/50 transition-colors">
                      <div className="font-medium text-gray-900 dark:text-white text-sm">{outputDetail.name || outputDetail.id}</div>
                      {outputDetail.nameEn && <div className="text-xs text-gray-500 dark:text-gray-400">{outputDetail.nameEn}</div>}
                      {hasDetail && (
                        <div className="mt-1.5 text-xs text-gray-600 dark:text-gray-400">
                          {outputDetail.detail.map((item: any, idx: number) => (
                            <span key={item.id || idx}>
                              {item.label}
                              {idx < outputDetail.detail.length - 1 && '、'}
                            </span>
                          ))}
                        </div>
                      )}
                      {outputDetail.note && (
                        <div className="mt-1.5 text-xs text-gray-500 dark:text-gray-400 italic">
                          💡 {outputDetail.note}
                        </div>
                      )}
                    </li>
                  )
                })}
              </ul>
            ) : (
              <div className="h-0" />
            )}
          </motion.div>
        </div>
      </motion.div>

      {/* 前后导航 - 更紧凑 */}
      <motion.div
        initial={{ opacity: 0 }}
        animate={{ opacity: 1 }}
        transition={{ delay: 0.15 }}
        className="flex items-center justify-between pt-3 border-t border-gray-200 dark:border-gray-700"
      >
        {prevProcess ? (
          <Link
            to={`/process/${prevProcess.id}`}
            state={location.state}
            className="flex items-center gap-2 text-gray-600 dark:text-gray-400 hover:text-indigo-600 dark:hover:text-indigo-400 transition-colors text-sm"
          >
            <ArrowLeft size={16} />
            <div>
              <div className="text-xs text-gray-400">上一个</div>
              <div className="font-medium">{prevProcess.code} {prevProcess.name}</div>
            </div>
          </Link>
        ) : <div />}
        {nextProcess ? (
          <Link
            to={`/process/${nextProcess.id}`}
            state={location.state}
            className="flex items-center gap-2 text-gray-600 dark:text-gray-400 hover:text-indigo-600 dark:hover:text-indigo-400 transition-colors text-right text-sm"
          >
            <div>
              <div className="text-xs text-gray-400">下一个</div>
              <div className="font-medium">{nextProcess.code} {nextProcess.name}</div>
            </div>
            <ArrowRight size={16} />
          </Link>
        ) : <div />}
      </motion.div>
    </div>
  )
}