import { FormEvent, useEffect, useState } from 'react'
import { ArrowLeft, Building2, ChevronRight, Coins, KeyRound, LoaderCircle, Save, UserRound } from 'lucide-react'
import { Link, useSearchParams } from 'react-router-dom'
import { api } from '../api'
import { useAuth } from '../AuthContext'
import type { PointsTransaction } from '../types'
import { useWorkspace } from '../WorkspaceContext'

type ProfileTab = 'profile' | 'security' | 'points'

const tabs: Array<{ id: ProfileTab; label: string; description: string; icon: typeof UserRound }> = [
  { id: 'profile', label: '用户信息', description: '姓名与组织资料', icon: UserRound },
  { id: 'security', label: '账户安全', description: '修改登录密码', icon: KeyRound },
  { id: 'points', label: '积分账单', description: '余额与积分流水', icon: Coins }
]

export function Profile() {
  const { user, setUser } = useAuth()
  const { organizations, currentOrganization } = useWorkspace()
  const [searchParams, setSearchParams] = useSearchParams()
  const requestedTab = searchParams.get('tab')
  const activeTab: ProfileTab = user?.mustChangePassword ? 'security' : tabs.some((tab) => tab.id === requestedTab)
    ? (requestedTab as ProfileTab)
    : 'profile'
  const [message, setMessage] = useState('')
  const [error, setError] = useState('')
  const [transactions, setTransactions] = useState<PointsTransaction[]>([])
  const [pointsLoading, setPointsLoading] = useState(false)
  const [displayBalance, setDisplayBalance] = useState<number | null>(null)

  useEffect(() => {
    if (activeTab !== 'points') return
    setPointsLoading(true)
    setError('');
    (currentOrganization ? api.organizations.points(currentOrganization.id) : api.getPointsTransactions())
      .then((result) => {
        setTransactions(result.transactions)
        setDisplayBalance(result.balance)
        if (!currentOrganization && user && result.balance !== user.pointsBalance) setUser({ ...user, pointsBalance: result.balance })
      })
      .catch((reason) => setError((reason as Error).message))
      .finally(() => setPointsLoading(false))
  }, [activeTab, currentOrganization?.id])

  if (!user) return null

  const changeTab = (tab: ProfileTab) => {
    setMessage('')
    setError('')
    setSearchParams(tab === 'profile' ? {} : { tab })
  }

  async function save(event: FormEvent<HTMLFormElement>) {
    event.preventDefault()
    const form = new FormData(event.currentTarget)
    setError('')
    setMessage('')
    try {
      const result = await api.updateMe({
        wechat: String(form.get('wechat')),
        contactName: String(form.get('contactName')),
        bio: String(form.get('bio'))
      })
      setUser(result.user)
      setMessage('个人信息已保存')
    } catch (reason) {
      setError((reason as Error).message)
    }
  }

  async function password(event: FormEvent<HTMLFormElement>) {
    event.preventDefault()
    const formElement = event.currentTarget
    const form = new FormData(formElement)
    setError('')
    setMessage('')
    if (form.get('newPassword') !== form.get('confirm')) return setError('两次输入的新密码不一致')
    try {
      await api.changePassword(String(form.get('currentPassword')), String(form.get('newPassword')))
      setUser({ ...user!, mustChangePassword: false })
      formElement.reset()
      setMessage('密码修改成功')
    } catch (reason) {
      setError((reason as Error).message)
    }
  }

  return (
    <div className="page profile-page">
      <Link to="/" className="back-link"><ArrowLeft size={16} />返回课程</Link>
      <div className="profile-settings">
        <aside className="profile-sidebar">
          <div className="profile-sidebar-heading">
            <div className="profile-avatar"><UserRound size={22} /></div>
            <div><strong>{user.contactName || '我的账户'}</strong><span>{user.phone}</span></div>
          </div>
          <nav aria-label="个人中心菜单">
            {tabs.filter((tab) => !user.mustChangePassword || tab.id === 'security').map(({ id, label, description, icon: Icon }) => (
              <button key={id} className={activeTab === id ? 'active' : ''} onClick={() => changeTab(id)}>
                <Icon size={18} />
                <span><strong>{label}</strong><small>{description}</small></span>
                <ChevronRight size={15} />
              </button>
            ))}
          </nav>
        </aside>

        <main className="profile-content">
          {activeTab === 'profile' && (
            <form className="paper-form profile-panel" onSubmit={save}>
              <div className="form-title"><h2>用户信息</h2><p>管理您的基本资料和联系方式</p></div>
              <label>注册手机号<input value={user.phone} disabled /></label>

              <div className="profile-field-item">
                <span className="profile-field-label">隶属组织</span>
                {organizations.length > 0 ? (
                  <div className="profile-org-list">
                    {organizations.map((org) => (
                      <div key={org.id} className="profile-org-card">
                        <div className="profile-org-main">
                          <div className="profile-org-icon-box">
                            <Building2 size={16} />
                          </div>
                          <div className="profile-org-meta">
                            <span className="profile-org-name">{org.name}</span>
                            <span className={`profile-org-badge ${org.role === 'MANAGER' ? 'badge-manager' : 'badge-member'}`}>
                              {org.role === 'MANAGER' ? '组织管理员' : '组织成员'}
                            </span>
                            {!org.isActive && <span className="profile-org-badge badge-inactive">已停用</span>}
                          </div>
                        </div>
                        {org.role === 'MANAGER' && (
                          <Link to={`/org/${org.slug}/manage`} className="profile-org-action">
                            组织管理
                          </Link>
                        )}
                      </div>
                    ))}
                  </div>
                ) : user.organization ? (
                  <div className="profile-org-list">
                    <div className="profile-org-card">
                      <div className="profile-org-main">
                        <div className="profile-org-icon-box">
                          <Building2 size={16} />
                        </div>
                        <div className="profile-org-meta">
                          <span className="profile-org-name">{user.organization}</span>
                          <span className="profile-org-badge badge-member">成员</span>
                        </div>
                      </div>
                    </div>
                  </div>
                ) : (
                  <div className="profile-org-empty-card">
                    <Building2 size={16} />
                    <span>当前为个人账号，暂未加入任何企业或组织</span>
                  </div>
                )}
              </div>

              <label>姓名<input name="contactName" defaultValue={user.contactName} placeholder="怎么称呼您" /></label>
              <label>联系方式（微信）<input name="wechat" defaultValue={user.wechat} placeholder="请输入微信号" /></label>
              <label>补充信息<textarea name="bio" rows={4} defaultValue={user.bio} placeholder="其他需要说明的信息" /></label>
              <button className="primary-button"><Save size={16} />保存信息</button>
            </form>
          )}

          {activeTab === 'security' && (
            <form className="paper-form profile-panel profile-security" onSubmit={password}>
              <div className="form-title"><h2>账户安全</h2><p>定期更新密码有助于保护您的账户</p></div>
              {user.mustChangePassword && <div className="notice notice-error">这是组织管理员创建的初始密码。请先设置自己的密码，再进入工作区。</div>}
              <label>当前密码<input name="currentPassword" type="password" required /></label>
              <label>新密码<input name="newPassword" type="password" minLength={6} required placeholder="至少 6 位" /></label>
              <label>确认新密码<input name="confirm" type="password" minLength={6} required /></label>
              <button className="secondary-button"><KeyRound size={16} />修改密码</button>
            </form>
          )}

          {activeTab === 'points' && (
            <section className="paper-form profile-panel points-history-panel">
              <div className="form-title points-form-title">
                <div>
                  <div className="points-heading-wrap">
                    <h2>{currentOrganization ? `${currentOrganization.name} · 积分账单` : '个人积分账单'}</h2>
                    {currentOrganization && (
                      <span className="points-org-pill">
                        <Building2 size={13} />
                        {currentOrganization.role === 'MANAGER' ? '组织管理员' : '组织成员'}
                      </span>
                    )}
                  </div>
                </div>
                <p>{currentOrganization?.role === 'MANAGER' ? '组织完整积分流水' : currentOrganization ? '组织余额与本人课程消耗' : '个人积分余额与流水'}</p>
              </div>
              <div className="points-wallet">
                <div className="points-wallet-icon"><Coins size={25} /></div>
                <div>
                  <span>{currentOrganization ? `${currentOrganization.name} · 组织可用积分` : '个人可用积分'}</span>
                  <strong>{(displayBalance ?? currentOrganization?.pointsBalance ?? user.pointsBalance).toLocaleString('zh-CN')}</strong>
                  <small>积分</small>
                </div>
              </div>
              <div className="points-history-heading">
                <h3>{currentOrganization ? `${currentOrganization.name} · 积分流水` : '积分流水'}</h3>
                <span>共 {transactions.length} 笔</span>
              </div>
              {pointsLoading ? (
                <div className="points-empty"><LoaderCircle className="spin" size={22} />正在加载消费记录…</div>
              ) : transactions.length ? (
                <div className="points-transaction-list">
                  {transactions.map((transaction) => (
                    <div className="points-transaction" key={transaction.id}>
                      <div className="transaction-icon"><Coins size={17} /></div>
                      <div className="transaction-main"><strong>{transaction.courseName}</strong><span>{transaction.points < 0 ? currentOrganization ? '组织账户支付课程费用' : '个人账户支付课程费用' : '积分入账'}</span></div>
                      <div className="transaction-value"><strong>{transaction.points.toLocaleString('zh-CN')}</strong><time>{new Date(transaction.createdAt).toLocaleString('zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit' })}</time></div>
                    </div>
                  ))}
                </div>
              ) : (
                <div className="points-empty"><Coins size={24} /><strong>暂无积分流水</strong><span>课程制作完成或积分入账后，记录会显示在这里</span></div>
              )}
            </section>
          )}
          {(message || error) && <div className={error ? 'notice notice-error' : 'notice notice-success'}>{error || message}</div>}
        </main>
      </div>
    </div>
  )
}