import React, { useState, useEffect } from 'react'
import api from '../utils/api'
import AdminPageNav from '../components/AdminPageNav'

export default function MediaWikiImportPage() {
  const [activeTab, setActiveTab] = useState('preview')
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState(null)

  // Preview Tab State
  const [previewCategory, setPreviewCategory] = useState('Übungen')
  const [previewType, setPreviewType] = useState('exercise')
  const [previewLimit, setPreviewLimit] = useState(10)
  const [previewData, setPreviewData] = useState(null)

  // Execute Tab State
  const [executeCategory, setExecuteCategory] = useState('Übungen')
  const [executeType, setExecuteType] = useState('exercise')
  const [executeReimport, setExecuteReimport] = useState(false)
  const [executeDryRun, setExecuteDryRun] = useState(false)
  const [executeLimit, setExecuteLimit] = useState(null)
  const [currentImport, setCurrentImport] = useState(null)
  const [pollingInterval, setPollingInterval] = useState(null)

  // History Tab State
  const [logs, setLogs] = useState([])

  // Load logs on mount and tab switch
  useEffect(() => {
    if (activeTab === 'history') {
      loadLogs()
    }
  }, [activeTab])

  // Polling cleanup
  useEffect(() => {
    return () => {
      if (pollingInterval) {
        clearInterval(pollingInterval)
      }
    }
  }, [pollingInterval])

  const loadLogs = async () => {
    try {
      setLoading(true)
      const data = await api.listMediaWikiImportLogs()
      setLogs(data)
    } catch (err) {
      setError(err.message)
    } finally {
      setLoading(false)
    }
  }

  const handlePreview = async () => {
    try {
      setLoading(true)
      setError(null)
      const data = await api.previewMediaWikiImport(previewCategory, previewType, previewLimit)
      setPreviewData(data)
    } catch (err) {
      setError(err.message)
    } finally {
      setLoading(false)
    }
  }

  const handleExecute = async () => {
    try {
      setLoading(true)
      setError(null)
      const result = await api.executeMediaWikiImport({
        category: executeCategory,
        import_type: executeType,
        reimport_existing: executeReimport,
        dry_run: executeDryRun,
        limit: executeLimit || null
      })
      setCurrentImport(result)

      // Start polling
      const interval = setInterval(async () => {
        try {
          const status = await api.getMediaWikiImportStatus(result.log_id)
          setCurrentImport(status)

          if (status.import_status === 'completed' || status.import_status === 'failed') {
            clearInterval(interval)
            setPollingInterval(null)
            setLoading(false)
          }
        } catch (err) {
          console.error('Polling error:', err)
        }
      }, 2000)

      setPollingInterval(interval)
    } catch (err) {
      setError(err.message)
      setLoading(false)
    }
  }

  return (
    <div style={{ padding: '20px', maxWidth: '1200px', margin: '0 auto' }}>
      <AdminPageNav />

      <h1>MediaWiki Import (Semantic MediaWiki)</h1>
      <p style={{ color: 'var(--text2)', marginBottom: '24px' }}>
        Importiere Übungen, Fähigkeiten und Methoden aus karatetrainer.net
      </p>

      {/* Tabs */}
      <div style={{ borderBottom: '2px solid var(--border)', marginBottom: '24px' }}>
        <div style={{ display: 'flex', gap: '8px' }}>
          {['preview', 'execute', 'history'].map(tab => (
            <button
              key={tab}
              onClick={() => setActiveTab(tab)}
              style={{
                padding: '12px 24px',
                background: activeTab === tab ? 'var(--accent)' : 'transparent',
                color: activeTab === tab ? 'white' : 'var(--text1)',
                border: 'none',
                borderBottom: activeTab === tab ? '2px solid var(--accent)' : '2px solid transparent',
                cursor: 'pointer',
                fontSize: '16px',
                fontWeight: activeTab === tab ? 'bold' : 'normal',
                transition: 'all 0.2s'
              }}
            >
              {tab === 'preview' && '👁️ Vorschau'}
              {tab === 'execute' && '▶️ Ausführen'}
              {tab === 'history' && '📜 Historie'}
            </button>
          ))}
        </div>
      </div>

      {/* Error Display */}
      {error && (
        <div style={{
          padding: '16px',
          background: '#FEE',
          border: '1px solid #C00',
          borderRadius: '8px',
          marginBottom: '20px'
        }}>
          <strong>Fehler:</strong> {error}
        </div>
      )}

      {/* Preview Tab */}
      {activeTab === 'preview' && (
        <div>
          <div style={{ background: 'var(--surface)', padding: '20px', borderRadius: '12px', marginBottom: '20px' }}>
            <h2>Import-Vorschau</h2>
            <div style={{ display: 'grid', gap: '16px', marginTop: '16px' }}>
              <div>
                <label style={{ display: 'block', marginBottom: '8px', fontWeight: 'bold' }}>
                  Kategorie
                </label>
                <input
                  type="text"
                  value={previewCategory}
                  onChange={(e) => setPreviewCategory(e.target.value)}
                  placeholder="Übungen"
                  style={{
                    width: '100%',
                    padding: '12px',
                    fontSize: '16px',
                    border: '1px solid var(--border)',
                    borderRadius: '8px'
                  }}
                />
              </div>
              <div>
                <label style={{ display: 'block', marginBottom: '8px', fontWeight: 'bold' }}>
                  Import-Typ
                </label>
                <select
                  value={previewType}
                  onChange={(e) => setPreviewType(e.target.value)}
                  style={{
                    width: '100%',
                    padding: '12px',
                    fontSize: '16px',
                    border: '1px solid var(--border)',
                    borderRadius: '8px'
                  }}
                >
                  <option value="exercise">Übungen</option>
                  <option value="skill">Fähigkeiten</option>
                  <option value="method">Methoden</option>
                </select>
              </div>
              <div>
                <label style={{ display: 'block', marginBottom: '8px', fontWeight: 'bold' }}>
                  Limit
                </label>
                <input
                  type="number"
                  value={previewLimit}
                  onChange={(e) => setPreviewLimit(parseInt(e.target.value) || 10)}
                  min="1"
                  max="100"
                  style={{
                    width: '100%',
                    padding: '12px',
                    fontSize: '16px',
                    border: '1px solid var(--border)',
                    borderRadius: '8px'
                  }}
                />
              </div>
              <button
                onClick={handlePreview}
                disabled={loading}
                style={{
                  padding: '16px',
                  background: 'var(--accent)',
                  color: 'white',
                  border: 'none',
                  borderRadius: '8px',
                  fontSize: '16px',
                  fontWeight: 'bold',
                  cursor: loading ? 'not-allowed' : 'pointer',
                  opacity: loading ? 0.6 : 1
                }}
              >
                {loading ? 'Lade...' : '👁️ Vorschau laden'}
              </button>
            </div>
          </div>

          {/* Preview Results */}
          {previewData && (
            <div>
              <h3>
                {previewData.total_found} Einträge gefunden in Kategorie "{previewData.category}"
              </h3>
              <div style={{ marginTop: '16px', display: 'grid', gap: '12px' }}>
                {previewData.preview.map((item, idx) => (
                  <details
                    key={idx}
                    style={{
                      background: 'var(--surface)',
                      padding: '16px',
                      borderRadius: '8px',
                      border: `2px solid ${item.errors.length > 0 ? '#C00' : item.warnings.length > 0 ? '#F90' : 'var(--border)'}`
                    }}
                  >
                    <summary style={{ cursor: 'pointer', fontWeight: 'bold', fontSize: '16px' }}>
                      {item.already_imported && '✅ '}
                      {item.wiki_page_title}
                      {item.errors.length > 0 && ' ❌'}
                      {item.warnings.length > 0 && ' ⚠️'}
                    </summary>
                    <div style={{ marginTop: '12px', fontSize: '14px', color: 'var(--text2)' }}>
                      {item.already_imported && (
                        <p><strong>Bereits importiert:</strong> {new Date(item.last_imported_at).toLocaleString('de-DE')}</p>
                      )}
                      {item.warnings.length > 0 && (
                        <div style={{ background: '#FFC', padding: '8px', borderRadius: '4px', marginTop: '8px' }}>
                          <strong>Warnungen:</strong>
                          <ul>{item.warnings.map((w, i) => <li key={i}>{w}</li>)}</ul>
                        </div>
                      )}
                      {item.errors.length > 0 && (
                        <div style={{ background: '#FEE', padding: '8px', borderRadius: '4px', marginTop: '8px' }}>
                          <strong>Fehler:</strong>
                          <ul>{item.errors.map((e, i) => <li key={i}>{e}</li>)}</ul>
                        </div>
                      )}
                      <details style={{ marginTop: '8px' }}>
                        <summary style={{ cursor: 'pointer', color: 'var(--accent)' }}>
                          Gemappte Felder anzeigen
                        </summary>
                        <pre style={{
                          background: 'var(--bg)',
                          padding: '12px',
                          borderRadius: '4px',
                          overflow: 'auto',
                          fontSize: '12px',
                          marginTop: '8px'
                        }}>
                          {JSON.stringify(item.mapped_fields, null, 2)}
                        </pre>
                      </details>
                    </div>
                  </details>
                ))}
              </div>
            </div>
          )}
        </div>
      )}

      {/* Execute Tab */}
      {activeTab === 'execute' && (
        <div>
          <div style={{ background: 'var(--surface)', padding: '20px', borderRadius: '12px', marginBottom: '20px' }}>
            <h2>Import ausführen</h2>
            <div style={{ display: 'grid', gap: '16px', marginTop: '16px' }}>
              <div>
                <label style={{ display: 'block', marginBottom: '8px', fontWeight: 'bold' }}>
                  Kategorie
                </label>
                <input
                  type="text"
                  value={executeCategory}
                  onChange={(e) => setExecuteCategory(e.target.value)}
                  placeholder="Übungen"
                  style={{
                    width: '100%',
                    padding: '12px',
                    fontSize: '16px',
                    border: '1px solid var(--border)',
                    borderRadius: '8px'
                  }}
                />
              </div>
              <div>
                <label style={{ display: 'block', marginBottom: '8px', fontWeight: 'bold' }}>
                  Import-Typ
                </label>
                <select
                  value={executeType}
                  onChange={(e) => setExecuteType(e.target.value)}
                  style={{
                    width: '100%',
                    padding: '12px',
                    fontSize: '16px',
                    border: '1px solid var(--border)',
                    borderRadius: '8px'
                  }}
                >
                  <option value="exercise">Übungen</option>
                  <option value="skill">Fähigkeiten</option>
                  <option value="method">Methoden</option>
                </select>
              </div>
              <div>
                <label style={{ display: 'flex', alignItems: 'center', gap: '8px', cursor: 'pointer' }}>
                  <input
                    type="checkbox"
                    checked={executeReimport}
                    onChange={(e) => setExecuteReimport(e.target.checked)}
                  />
                  <span>Existierende überschreiben (Reimport)</span>
                </label>
              </div>
              <div>
                <label style={{ display: 'flex', alignItems: 'center', gap: '8px', cursor: 'pointer' }}>
                  <input
                    type="checkbox"
                    checked={executeDryRun}
                    onChange={(e) => setExecuteDryRun(e.target.checked)}
                  />
                  <span>Dry-Run (nicht speichern)</span>
                </label>
              </div>
              <div>
                <label style={{ display: 'block', marginBottom: '8px', fontWeight: 'bold' }}>
                  Limit (optional)
                </label>
                <input
                  type="number"
                  value={executeLimit || ''}
                  onChange={(e) => setExecuteLimit(e.target.value ? parseInt(e.target.value) : null)}
                  placeholder="Kein Limit"
                  min="1"
                  style={{
                    width: '100%',
                    padding: '12px',
                    fontSize: '16px',
                    border: '1px solid var(--border)',
                    borderRadius: '8px'
                  }}
                />
              </div>
              <button
                onClick={handleExecute}
                disabled={loading}
                style={{
                  padding: '16px',
                  background: executeDryRun ? 'var(--accent-dark)' : 'var(--accent)',
                  color: 'white',
                  border: 'none',
                  borderRadius: '8px',
                  fontSize: '16px',
                  fontWeight: 'bold',
                  cursor: loading ? 'not-allowed' : 'pointer',
                  opacity: loading ? 0.6 : 1
                }}
              >
                {loading ? '⏳ Import läuft...' : executeDryRun ? '🧪 Dry-Run starten' : '▶️ Import starten'}
              </button>
            </div>
          </div>

          {/* Import Status */}
          {currentImport && (
            <div style={{
              background: 'var(--surface)',
              padding: '20px',
              borderRadius: '12px',
              border: `2px solid ${
                currentImport.import_status === 'completed' ? '#0A0' :
                currentImport.import_status === 'failed' ? '#C00' :
                'var(--accent)'
              }`
            }}>
              <h3>
                {currentImport.import_status === 'running' && '⏳ Import läuft...'}
                {currentImport.import_status === 'completed' && '✅ Import abgeschlossen'}
                {currentImport.import_status === 'failed' && '❌ Import fehlgeschlagen'}
              </h3>
              <div style={{ marginTop: '16px', display: 'grid', gap: '8px', fontSize: '14px' }}>
                <div><strong>Log ID:</strong> {currentImport.id}</div>
                <div><strong>Kategorie:</strong> {currentImport.category}</div>
                <div><strong>Typ:</strong> {currentImport.import_type}</div>
                <div><strong>Total:</strong> {currentImport.items_total}</div>
                <div style={{ color: '#0A0' }}><strong>✅ Importiert:</strong> {currentImport.items_imported}</div>
                <div style={{ color: '#F90' }}><strong>⏭️ Übersprungen:</strong> {currentImport.items_skipped}</div>
                <div style={{ color: '#C00' }}><strong>❌ Fehlgeschlagen:</strong> {currentImport.items_failed}</div>
                {currentImport.started_at && (
                  <div><strong>Gestartet:</strong> {new Date(currentImport.started_at).toLocaleString('de-DE')}</div>
                )}
                {currentImport.finished_at && (
                  <div><strong>Beendet:</strong> {new Date(currentImport.finished_at).toLocaleString('de-DE')}</div>
                )}
              </div>

              {currentImport.error_log && currentImport.error_log.length > 0 && (
                <details style={{ marginTop: '16px' }}>
                  <summary style={{ cursor: 'pointer', color: '#C00', fontWeight: 'bold' }}>
                    ❌ Fehler anzeigen ({currentImport.error_log.length})
                  </summary>
                  <div style={{
                    marginTop: '8px',
                    background: '#FEE',
                    padding: '12px',
                    borderRadius: '4px',
                    maxHeight: '300px',
                    overflow: 'auto'
                  }}>
                    {currentImport.error_log.map((err, idx) => (
                      <div key={idx} style={{ marginBottom: '8px', paddingBottom: '8px', borderBottom: '1px solid #CCC' }}>
                        <strong>{err.item}:</strong> {err.error}
                      </div>
                    ))}
                  </div>
                </details>
              )}
            </div>
          )}
        </div>
      )}

      {/* History Tab */}
      {activeTab === 'history' && (
        <div>
          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '16px' }}>
            <h2>Import-Historie</h2>
            <button
              onClick={loadLogs}
              disabled={loading}
              style={{
                padding: '8px 16px',
                background: 'var(--accent)',
                color: 'white',
                border: 'none',
                borderRadius: '8px',
                cursor: loading ? 'not-allowed' : 'pointer',
                opacity: loading ? 0.6 : 1
              }}
            >
              🔄 Aktualisieren
            </button>
          </div>

          {logs.length === 0 && !loading && (
            <p style={{ color: 'var(--text2)', textAlign: 'center', padding: '40px' }}>
              Noch keine Imports durchgeführt
            </p>
          )}

          <div style={{ display: 'grid', gap: '12px' }}>
            {logs.map((log) => (
              <div
                key={log.id}
                style={{
                  background: 'var(--surface)',
                  padding: '16px',
                  borderRadius: '8px',
                  border: `2px solid ${
                    log.import_status === 'completed' ? '#0A0' :
                    log.import_status === 'failed' ? '#C00' :
                    'var(--accent)'
                  }`
                }}
              >
                <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'start' }}>
                  <div>
                    <div style={{ fontSize: '18px', fontWeight: 'bold', marginBottom: '8px' }}>
                      {log.import_status === 'completed' && '✅ '}
                      {log.import_status === 'failed' && '❌ '}
                      {log.import_status === 'running' && '⏳ '}
                      {log.category} ({log.import_type})
                      {log.dry_run && ' [Dry-Run]'}
                    </div>
                    <div style={{ fontSize: '14px', color: 'var(--text2)', display: 'grid', gap: '4px' }}>
                      <div>{new Date(log.started_at).toLocaleString('de-DE')}</div>
                      <div>
                        <span style={{ color: '#0A0' }}>✅ {log.items_imported}</span>
                        {' | '}
                        <span style={{ color: '#F90' }}>⏭️ {log.items_skipped}</span>
                        {' | '}
                        <span style={{ color: '#C00' }}>❌ {log.items_failed}</span>
                        {' | '}
                        <span>Total: {log.items_total}</span>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            ))}
          </div>
        </div>
      )}
    </div>
  )
}