import { FlaskConical, ListChecks, LogOut, Plus, Radar, Server, Settings } from 'lucide-react'
import { useState, type FormEvent } from 'react'
import { NavLink, Navigate, Route, Routes } from 'react-router-dom'
import { activateSource, getBase, listSources } from '@shared/api/source'
import { describeError, Field, SourceButton, Spinner, ThemeToggle } from '@shared/ui'
import { useAuth } from './auth'
import { AgentDetail } from './pages/AgentDetail'
import { Agents } from './pages/Agents'
import { Probes } from './pages/Probes'
import { System } from './pages/System'
import { Tasks } from './pages/Tasks'
import { Tests } from './pages/Tests'

/** 登录页：左边选后端（这个页面自己所在的，或保存过的，或添加一个），右边都是用户名 + 密码。 */
function Login() {
  const { login } = useAuth()
  const active = getBase()
  const saved = listSources()
  const [adding, setAdding] = useState(false)
  const [url, setUrl] = useState('')
  const [username, setUsername] = useState('')
  const [password, setPassword] = useState('')
  const [error, setError] = useState('')
  const [busy, setBusy] = useState(false)

  const choose = (base: string) => {
    setAdding(false)
    setError('')
    setPassword('')
    if (base !== active) {
      activateSource(base)
      location.reload()
    }
  }

  const submit = async (e: FormEvent) => {
    e.preventDefault()
    setBusy(true)
    setError('')
    try {
      await login(username, password, adding ? url : undefined)
    } catch (err) {
      setError(describeError(err))
    } finally {
      setBusy(false)
    }
  }

  const rows = [{ base: '', label: location.host }, ...saved.map((x) => ({ base: x.base, label: x.base.replace(/^https?:\/\//i, '') }))]
  const title = adding ? '添加后端' : active ? active.replace(/^https?:\/\//i, '') : location.origin

  return (
    <div className="login">
      <form className="card login-split" onSubmit={submit}>
        <aside className="login-side">
          <div>
            <h1>MoShiro</h1>
            <p className="muted">管理端</p>
          </div>
          <div className="src-list" role="listbox" aria-label="后端">
            {rows.map((row) => {
              const on = !adding && row.base === active
              return (
                <button key={row.base || 'page'} type="button" role="option" aria-selected={on} className={`src-pick${on ? ' on' : ''}`} onClick={() => choose(row.base)}>
                  <span className="src-dot" />
                  <span className="src-text">
                    <b>{row.label}</b>
                  </span>
                </button>
              )
            })}
            <button
              type="button"
              role="option"
              aria-selected={adding}
              className={`src-pick${adding ? ' on' : ''}`}
              onClick={() => {
                setAdding(true)
                setUrl('')
                setPassword('')
                setError('')
              }}
            >
              <Plus size={14} />
              <span className="src-text">
                <b>添加后端</b>
              </span>
            </button>
          </div>
        </aside>
        <section className="login-main stack">
          <h2>{title}</h2>
          {adding ? (
            <Field label="后端地址">
              <input className="input" name="backend-url" type="text" inputMode="url" value={url} onChange={(e) => setUrl(e.target.value)} placeholder="例如 https://你的域名" autoComplete="off" autoFocus required />
            </Field>
          ) : null}
          <Field label="用户名">
            <input className="input" name="username" value={username} onChange={(e) => setUsername(e.target.value)} autoComplete="username" autoFocus={!adding} required />
          </Field>
          <Field label="密码">
            <input className="input" name="password" type="password" value={password} onChange={(e) => setPassword(e.target.value)} autoComplete="current-password" required />
          </Field>
          {error ? <div className="notice bad">{error}</div> : null}
          <button className="btn primary" type="submit" disabled={busy}>
            {adding ? '保存并登录' : '登录'}
          </button>
        </section>
      </form>
    </div>
  )
}

const NAV = [
  { section: '运维', items: [{ to: '/agents', label: 'Agent', icon: Server }, { to: '/probes', label: 'Probe', icon: Radar }] },
  { section: '测试', items: [{ to: '/tasks', label: '任务', icon: ListChecks }, { to: '/tests', label: '按需测试', icon: FlaskConical }] },
  { section: '系统', items: [{ to: '/system', label: '系统', icon: Settings }] },
]

export function App() {
  const { me, ready, logout } = useAuth()
  if (!ready) {
    return (
      <div className="login">
        <Spinner />
      </div>
    )
  }
  if (!me) return <Login />

  return (
    <div className="shell">
      <aside className="side">
        <a className="brand" href="/">
          MoShiro
        </a>
        {NAV.map((group) => (
          <div key={group.section} style={{ display: 'contents' }}>
            <div className="section">{group.section}</div>
            {group.items.map(({ to, label, icon: Icon }) => (
              <NavLink key={to} to={to} className={({ isActive }) => `nav ${isActive ? 'active' : ''}`}>
                <Icon size={20} />
                {label}
              </NavLink>
            ))}
          </div>
        ))}
        <div className="spacer" />
        <SourceButton variant="status" />
        <div className="me">
          <span className="avatar">{(me.username ?? 'A').slice(0, 1).toUpperCase()}</span>
          <span className="grow">
            <div style={{ fontWeight: 600 }}>{me.username ?? 'API 令牌'}</div>
            <div className="faint" style={{ fontSize: 12 }}>
              {me.scope}
            </div>
          </span>
          <ThemeToggle />
          <button type="button" className="btn icon" onClick={() => void logout()} aria-label="退出登录" title="退出登录">
            <LogOut size={18} />
          </button>
        </div>
      </aside>
      <div className="main">
        <Routes>
          <Route path="/" element={<Navigate to="/agents" replace />} />
          <Route path="/agents" element={<Agents />} />
          <Route path="/agents/:id" element={<AgentDetail />} />
          <Route path="/probes" element={<Probes />} />
          <Route path="/tasks" element={<Tasks />} />
          <Route path="/tests" element={<Tests />} />
          <Route path="/system" element={<System />} />
          <Route path="*" element={<Navigate to="/agents" replace />} />
        </Routes>
      </div>
    </div>
  )
}