/**
 * Admin 后台 - 系统配置管理页面(报刊风)
 *
 * 功能:
 * - 登录与鉴权说明(ADMIN_PASSWORD,HttpOnly 会话 Cookie)
 * - 显示当前 .env 配置(脱敏;后端暂无配置端点,为静态说明)
 * - 配置修改指南
 */

import { useEffect, useState, useCallback } from 'react'
import { fetchSystemConfig } from '../dal'
import { changePassword, fetchAuthState, UNAUTHORIZED_EVENT } from '../api'
import { Card, CardBody, CardHeader, Badge, SectionHeader, Alert, Spinner, SkeletonBlock } from '../components'

export default function ConfigPage() {
  const [config, setConfig] = useState<any[]>([])
  const [loading, setLoading] = useState(true)
  const [passwordOrigin, setPasswordOrigin] = useState<'db' | 'env' | 'none' | null>(null)

  // 修改密码表单
  const [currentPwd, setCurrentPwd] = useState('')
  const [newPwd, setNewPwd] = useState('')
  const [confirmPwd, setConfirmPwd] = useState('')
  const [pwdBusy, setPwdBusy] = useState(false)
  const [pwdNotice, setPwdNotice] = useState<{ ok: boolean; text: string } | null>(null)

  const loadConfig = useCallback(async () => {
    setLoading(true)
    try {
      const data = await fetchSystemConfig()
      setConfig(data)
    } catch {
      setConfig([])
    } finally {
      setLoading(false)
    }
  }, [])

  useEffect(() => {
    loadConfig()
    fetchAuthState()
      .then(s => setPasswordOrigin(s.password_origin ?? null))
      .catch(() => setPasswordOrigin(null))
  }, [loadConfig])

  async function handleChangePassword(e: React.FormEvent) {
    e.preventDefault()
    setPwdNotice(null)
    if (newPwd !== confirmPwd) {
      setPwdNotice({ ok: false, text: '两次输入的新密码不一致' })
      return
    }
    setPwdBusy(true)
    try {
      const res = await changePassword(currentPwd, newPwd)
      setPwdNotice({ ok: true, text: res.message })
      // 密码即会话密钥,修改后所有会话失效:主动切回登录页
      setTimeout(() => window.dispatchEvent(new CustomEvent(UNAUTHORIZED_EVENT)), 1500)
    } catch (err) {
      setPwdNotice({ ok: false, text: err instanceof Error ? err.message.split('\n')[0] : '修改失败' })
    } finally {
      setPwdBusy(false)
    }
  }

  return (
    <div className="space-y-6">
      <SectionHeader
        title="系统配置"
        description="登录鉴权说明与系统参数查看。敏感配置一律通过服务器 .env 文件管理。"
      />

      {/* 登录与鉴权 */}
      <Card>
        <CardHeader
          title="登录与鉴权"
          description="本后台通过密码登录保护,会话以 HttpOnly Cookie 保存,有效期默认 7 天"
        />
        <CardBody>
          <Alert kind="ok" title="已通过密码登录" />
          <p className="mt-3 text-2xs leading-relaxed text-ink-500">
            密码初始来自服务器 <code className="font-mono">.env</code> 的{' '}
            <code className="font-mono">ADMIN_PASSWORD</code>(启动时自动转为哈希),在下方修改后以{' '}
            <code className="font-mono">scrypt</code> 哈希安全存入数据库并立即生效,明文不再留存。
            密码即会话签名密钥,修改后所有已登录会话失效,需用新密码重新登录。
            脚本直连接口可改用 <code className="font-mono">ADMIN_API_KEY</code>(请求头 X-API-Key)。
          </p>
          {passwordOrigin && (
            <p className="mt-2 flex items-center gap-2 text-2xs text-ink-500">
              当前密码来源:
              {passwordOrigin === 'db' ? (
                <Badge status="success">数据库(scrypt 哈希)</Badge>
              ) : passwordOrigin === 'env' ? (
                <Badge status="info">.env 初始值</Badge>
              ) : (
                <Badge status="error">未配置</Badge>
              )}
            </p>
          )}

          {/* 修改密码表单 */}
          <form onSubmit={handleChangePassword} className="mt-5 space-y-3 border-t border-ink-200 pt-4">
            <div className="grid gap-3 sm:grid-cols-3">
              <div>
                <label className="mb-1 block text-2xs text-ink-500">当前密码</label>
                <input
                  type="password"
                  value={currentPwd}
                  onChange={e => setCurrentPwd(e.target.value)}
                  autoComplete="current-password"
                  className="field w-full"
                />
              </div>
              <div>
                <label className="mb-1 block text-2xs text-ink-500">新密码(至少 8 位)</label>
                <input
                  type="password"
                  value={newPwd}
                  onChange={e => setNewPwd(e.target.value)}
                  autoComplete="new-password"
                  className="field w-full"
                />
              </div>
              <div>
                <label className="mb-1 block text-2xs text-ink-500">确认新密码</label>
                <input
                  type="password"
                  value={confirmPwd}
                  onChange={e => setConfirmPwd(e.target.value)}
                  autoComplete="new-password"
                  className="field w-full"
                />
              </div>
            </div>

            {pwdNotice && (
              <Alert kind={pwdNotice.ok ? 'ok' : 'error'} title={pwdNotice.text} />
            )}

            <div className="flex items-center justify-between gap-2">
              <p className="text-2xs text-ink-400">修改成功后会自动退出登录,请用新密码重新登录。</p>
              <button
                type="submit"
                disabled={pwdBusy || !currentPwd || !newPwd || !confirmPwd}
                className="btn btn-solid btn-sm flex-shrink-0"
              >
                {pwdBusy ? (<><Spinner /> 修改中</>) : '修改密码'}
              </button>
            </div>
          </form>
        </CardBody>
      </Card>

      {/* 快速导航 */}
      <div className="grid gap-4 sm:grid-cols-2">
        <a
          href="/admin/data-sources"
          className="group flex items-center justify-between border border-ink-300 p-4 transition-colors hover:border-ink-900 hover:bg-paper-100"
        >
          <div>
            <div className="font-serif text-sm font-bold text-ink-900">数据源配置</div>
            <div className="mt-0.5 text-2xs text-ink-500">管理采集源 API Key</div>
          </div>
          <span className="text-ink-300 transition-colors group-hover:text-press" aria-hidden="true">→</span>
        </a>
        <a
          href="/admin/llm-config"
          className="group flex items-center justify-between border border-ink-300 p-4 transition-colors hover:border-ink-900 hover:bg-paper-100"
        >
          <div>
            <div className="font-serif text-sm font-bold text-ink-900">LLM 配置</div>
            <div className="mt-0.5 text-2xs text-ink-500">管理模型连接与统计</div>
          </div>
          <span className="text-ink-300 transition-colors group-hover:text-press" aria-hidden="true">→</span>
        </a>
      </div>

      {/* 配置列表 */}
      <Card>
        <CardHeader
          title="当前配置"
          description="脱敏展示,实际值在服务器 .env 文件中"
          action={
            <button onClick={loadConfig} disabled={loading} className="btn btn-sm">
              {loading ? (<><Spinner /> 加载中</>) : '刷新'}
            </button>
          }
        />
        <CardBody className="px-0 sm:px-0">
          {loading ? (
            <div className="space-y-3 px-4 sm:px-5">
              {[1, 2, 3, 4, 5].map(i => (
                <SkeletonBlock key={i} className="h-9 w-full" />
              ))}
            </div>
          ) : config.length > 0 ? (
            <div>
              {config.map(item => (
                <div
                  key={item.key}
                  className="flex flex-col gap-1 border-b border-ink-200 px-4 py-2.5 last:border-b-0 sm:grid sm:grid-cols-[minmax(0,2fr)_minmax(0,3fr)_minmax(0,2fr)] sm:items-baseline sm:gap-4 sm:px-5"
                >
                  <div className="flex items-center gap-2">
                    <span className="font-mono text-xs text-ink-800">{item.key}</span>
                    {item.is_sensitive && <Badge status="warning">敏感</Badge>}
                  </div>
                  <div className="break-all font-mono text-2xs text-ink-500">{item.value_masked}</div>
                  <div className="text-2xs text-ink-400">{item.description}</div>
                </div>
              ))}
            </div>
          ) : (
            <p className="py-8 text-center text-xs text-ink-400">无法加载配置信息</p>
          )}
        </CardBody>
      </Card>

      {/* 修改指南 */}
      <Card>
        <CardHeader title="修改配置指南" />
        <CardBody className="space-y-5">
          <div>
            <h4 className="mb-2 font-serif text-sm font-bold text-ink-900">通过 SSH 修改 .env</h4>
            <pre className="overflow-x-auto border border-ink-200 bg-paper-100 p-3 font-mono text-2xs leading-relaxed text-ink-700">
{`# 连接到部署主机
ssh user@your-server-ip

# 进入项目目录
cd /vol2/1000/Docker/Profeto

# 编辑 .env 文件
nano .env

# 修改后重启后端服务
docker compose restart api

# 查看日志确认生效
docker compose logs -f api`}
            </pre>
          </div>

          <div>
            <h4 className="mb-2 font-serif text-sm font-bold text-ink-900">常用配置项说明</h4>
            <div className="space-y-2">
              {[
                ['LLM_API_KEY', 'LLM 服务商的 API 密钥,用于调用大模型'],
                ['LLM_MODEL', '使用的模型名称,如 gpt-4o、claude-3-5-sonnet'],
                ['LLM_BASE_URL', 'API 基础地址,支持兼容 OpenAI 协议的服务商'],
                ['ADMIN_PASSWORD', '管理后台登录密码,修改后重启 api 容器生效'],
                ['ADMIN_API_KEY', '脚本直连接口的鉴权密钥(请求头 X-API-Key)'],
                ['BZZOIRO_KEY', 'Bzzoiro 数据源 API 密钥'],
                ['DATABASE_URL', 'PostgreSQL 数据库连接字符串'],
              ].map(([key, desc]) => (
                <div key={key} className="flex items-start gap-2.5">
                  <code className="flex-shrink-0 border border-ink-200 bg-paper-100 px-1.5 py-0.5 font-mono text-2xs text-ink-800">
                    {key}
                  </code>
                  <span className="text-xs leading-relaxed text-ink-600">{desc}</span>
                </div>
              ))}
            </div>
          </div>
        </CardBody>
      </Card>
    </div>
  )
}