import { useEffect, useState } from 'hono/jsx'
import { connectToWifi, getWifiStatus, scanWifiNetworks } from '../api'
import { setCurrentView, setupMode } from '../state'
import {
  Button,
  DashboardInstallCmd,
  ErrorBox,
  FormActions,
  FormField,
  FormInput,
  FormLabel,
  HeaderActions,
  InfoLabel,
  InfoRow,
  InfoValue,
  Main,
  MainContent,
  MainHeader,
  MainTitle,
  NetworkItem,
  NetworkListWrap,
  NetworkMeta,
  NetworkName,
  Section,
  SectionTitle,
  SignalBarSegment,
  SignalBarsWrap,
  Spinner,
  SpinnerWrap,
  SuccessCheck,
  WifiColumn,
} from '../styles'
import { theme } from '../themes'
import type { WifiNetwork } from '../../shared/types'

type WifiStep = 'status' | 'scanning' | 'networks' | 'password' | 'connecting' | 'success'

function signalBars(signal: number) {
  const level = signal > 75 ? 4 : signal > 50 ? 3 : signal > 25 ? 2 : 1
  return (
    <SignalBarsWrap>
      {[1, 2, 3, 4].map(i => (
        <SignalBarSegment
          key={i}
          level={i <= level ? 'active' : 'inactive'}
          style={{ height: 3 + i * 3 }}
        />
      ))}
    </SignalBarsWrap>
  )
}

function NetworkList({ networks, onSelect }: { networks: WifiNetwork[], onSelect: (net: WifiNetwork) => void }) {
  if (networks.length === 0) {
    return (
      <SpinnerWrap>
        No networks found. Try scanning again.
      </SpinnerWrap>
    )
  }

  return (
    <NetworkListWrap>
      {networks.map(net => (
        <NetworkItem key={net.ssid} onClick={() => onSelect(net)}>
          <NetworkName>{net.ssid}</NetworkName>
          <NetworkMeta>
            {net.security && net.security !== '' && net.security !== '--' && <span style={{ fontSize: 12 }}>🔒</span>}
            {signalBars(net.signal)}
          </NetworkMeta>
        </NetworkItem>
      ))}
    </NetworkListWrap>
  )
}

export function SettingsPage({ render }: { render: () => void }) {
  const [step, setStep] = useState<WifiStep>('status')
  const [connected, setConnected] = useState(false)
  const [currentSsid, setCurrentSsid] = useState('')
  const [currentIp, setCurrentIp] = useState('')
  const [networks, setNetworks] = useState<WifiNetwork[]>([])
  const [selectedNetwork, setSelectedNetwork] = useState<WifiNetwork | null>(null)
  const [password, setPassword] = useState('')
  const [error, setError] = useState('')
  const [successSsid, setSuccessSsid] = useState('')
  const [successIp, setSuccessIp] = useState('')
  const [serverUrl, setServerUrl] = useState('')

  const fetchStatus = () => {
    getWifiStatus().then(status => {
      setConnected(status.connected)
      setCurrentSsid(status.ssid)
      setCurrentIp(status.ip)
      if (status.url) setServerUrl(status.url)
    }).catch(() => {})
  }

  useEffect(() => {
    fetchStatus()
    if (setupMode) doScan()
  }, [])

  const goBack = () => {
    setCurrentView('dashboard')
    render()
  }

  const doScan = () => {
    setStep('scanning')
    setError('')
    scanWifiNetworks()
      .then(nets => {
        setNetworks(nets)
        setStep('networks')
      })
      .catch(() => {
        setError('Failed to scan networks')
        setStep('networks')
      })
  }

  const handleSelectNetwork = (net: WifiNetwork) => {
    setSelectedNetwork(net)
    setPassword('')
    setError('')
    const needsPassword = net.security && net.security !== '' && net.security !== '--'
    if (needsPassword) {
      setStep('password')
    } else {
      doConnect(net.ssid)
    }
  }

  const doConnect = (ssid: string, pw?: string) => {
    setStep('connecting')
    setError('')
    connectToWifi(ssid, pw)
      .then(result => {
        if (result.ok) {
          setSuccessSsid(result.ssid || ssid)
          setSuccessIp(result.ip || '')
          setStep('success')
          fetchStatus()
        } else {
          setError(result.error || 'Connection failed. Check your password and try again.')
          setStep('password')
        }
      })
      .catch(() => {
        setError('Connection failed. Please try again.')
        setStep('password')
      })
  }

  const handleConnect = (e: Event) => {
    e.preventDefault()
    if (!selectedNetwork) return
    doConnect(selectedNetwork.ssid, password || undefined)
  }

  const title = setupMode ? 'WiFi Setup' : 'Settings'

  return (
    <Main>
      <MainHeader centered>
        <MainTitle>{title}</MainTitle>
        {!setupMode && (
          <HeaderActions>
            <Button onClick={goBack}>Back</Button>
          </HeaderActions>
        )}
      </MainHeader>
      <MainContent centered>
        <Section>
          <SectionTitle>WiFi</SectionTitle>

          {/* Status display */}
          {step === 'status' && (
            <WifiColumn>
              <div>
                <InfoRow>
                  <InfoLabel>Status</InfoLabel>
                  <InfoValue style={{ color: connected ? theme('colors-statusRunning') : theme('colors-error'), fontWeight: 500 }}>
                    {connected ? 'Connected' : 'Disconnected'}
                  </InfoValue>
                </InfoRow>
                {connected && currentSsid && (
                  <InfoRow>
                    <InfoLabel>Network</InfoLabel>
                    <InfoValue>{currentSsid}</InfoValue>
                  </InfoRow>
                )}
                {connected && currentIp && (
                  <InfoRow>
                    <InfoLabel>IP</InfoLabel>
                    <InfoValue style={{ fontFamily: theme('fonts-mono') }}>{currentIp}</InfoValue>
                  </InfoRow>
                )}
              </div>
              <FormActions>
                <Button onClick={doScan}>Scan Networks</Button>
              </FormActions>
            </WifiColumn>
          )}

          {/* Scanning spinner */}
          {step === 'scanning' && (
            <SpinnerWrap>
              <Spinner />
              <p style={{ color: theme('colors-textMuted') }}>Scanning for networks...</p>
            </SpinnerWrap>
          )}

          {/* Network list */}
          {step === 'networks' && (
            <WifiColumn style={{ gap: 12 }}>
              <NetworkList networks={networks} onSelect={handleSelectNetwork} />
              {error && <ErrorBox>{error}</ErrorBox>}
              <FormActions>
                {!setupMode && <Button onClick={() => setStep('status')}>Back</Button>}
                <Button onClick={doScan}>Rescan</Button>
              </FormActions>
            </WifiColumn>
          )}

          {/* Password entry */}
          {step === 'password' && (
            <WifiColumn>
              <FormField>
                <FormLabel>Network</FormLabel>
                <div style={{ fontWeight: 500, fontSize: 16 }}>{selectedNetwork?.ssid}</div>
              </FormField>
              <form onSubmit={handleConnect} style={{ display: 'flex', flexDirection: 'column', gap: 16 }}>
                <FormField>
                  <FormLabel>Password</FormLabel>
                  <FormInput
                    type="password"
                    value={password}
                    onInput={(e: Event) => setPassword((e.target as HTMLInputElement).value)}
                    placeholder="Enter WiFi password"
                    autofocus
                  />
                </FormField>
                {error && <ErrorBox>{error}</ErrorBox>}
                <FormActions>
                  <Button onClick={() => { setError(''); setStep('networks') }}>Back</Button>
                  <Button variant="primary" type="submit">Connect</Button>
                </FormActions>
              </form>
            </WifiColumn>
          )}

          {/* Connecting spinner */}
          {step === 'connecting' && (
            <SpinnerWrap>
              <Spinner />
              <p style={{ color: theme('colors-textMuted') }}>Connecting to <strong>{selectedNetwork?.ssid}</strong>...</p>
            </SpinnerWrap>
          )}

          {/* Success */}
          {step === 'success' && (
            <WifiColumn style={{ textAlign: 'center' }}>
              <SuccessCheck>✓</SuccessCheck>
              <h3 style={{ fontSize: 20, fontWeight: 600, marginBottom: 8 }}>Connected!</h3>
              <p style={{ color: theme('colors-textMuted'), marginBottom: 16 }}>
                Connected to <strong>{successSsid}</strong>
                {successIp && <span> ({successIp})</span>}
              </p>
              {setupMode ? (
                <div style={{
                  marginTop: 20,
                  padding: 16,
                  background: 'var(--colors-bgSubtle)',
                  borderRadius: 'var(--radius-md)',
                  border: '1px solid var(--colors-border)',
                }}>
                  <p style={{ marginBottom: 8 }}>Reconnect your device to <strong>{successSsid}</strong> and visit:</p>
                  <a
                    href={serverUrl}
                    style={{ color: theme('colors-statusRunning'), fontSize: 18, fontWeight: 600, textDecoration: 'none' }}
                  >
                    {serverUrl}
                  </a>
                </div>
              ) : (
                <FormActions>
                  <Button onClick={() => { fetchStatus(); setStep('status') }}>Done</Button>
                </FormActions>
              )}
            </WifiColumn>
          )}
        </Section>

        {!setupMode && (
          <Section>
            <SectionTitle>Install CLI</SectionTitle>
            <DashboardInstallCmd>
              curl -fsSL {location.origin}/install | bash
            </DashboardInstallCmd>
          </Section>
        )}
      </MainContent>
    </Main>
  )
}