'use client'

import { useEffect, useState } from 'react'
import type { DeskewResult, DewarpResult, DewarpDetection, DewarpGroundTruth } from '@/app/(admin)/ai/ocr-pipeline/types'

interface DewarpControlsProps {
  dewarpResult: DewarpResult | null
  deskewResult?: DeskewResult | null
  showGrid: boolean
  onToggleGrid: () => void
  onManualDewarp: (shearDegrees: number) => void
  onCombinedAdjust?: (rotationDegrees: number, shearDegrees: number) => void
  onGroundTruth: (gt: DewarpGroundTruth) => void
  onNext: () => void
  isApplying: boolean
}

const METHOD_LABELS: Record<string, string> = {
  vertical_edge: 'A: Vertikale Kanten',
  projection: 'B: Projektions-Varianz',
  hough_lines: 'C: Hough-Linien',
  text_lines: 'D: Textzeilenanalyse',
  manual: 'Manuell',
  manual_combined: 'Manuell (kombiniert)',
  none: 'Keine Korrektur',
}

const SHEAR_METHOD_KEYS = ['vertical_edge', 'projection', 'hough_lines', 'text_lines'] as const

/** Colour for a confidence value (0-1). */
function confColor(conf: number): string {
  if (conf >= 0.7) return 'text-green-600 dark:text-green-400'
  if (conf >= 0.5) return 'text-yellow-600 dark:text-yellow-400'
  return 'text-gray-400'
}

/** Short confidence bar (visual). */
function ConfBar({ value }: { value: number }) {
  const pct = Math.round(value * 100)
  const bg = value >= 0.7 ? 'bg-green-500' : value >= 0.5 ? 'bg-yellow-500' : 'bg-gray-400'
  return (
    <div className="flex items-center gap-1.5">
      <div className="w-16 h-1.5 bg-gray-200 dark:bg-gray-700 rounded-full overflow-hidden">
        <div className={`h-full rounded-full ${bg}`} style={{ width: `${pct}%` }} />
      </div>
      <span className={`text-xs font-mono ${confColor(value)}`}>{pct}%</span>
    </div>
  )
}

/** A single slider row for fine-tuning. */
function FineTuneSlider({
  label,
  value,
  onChange,
  min,
  max,
  step,
  unit = '\u00B0',
  radioName,
  radioChecked,
  onRadioChange,
}: {
  label: string
  value: number
  onChange: (v: number) => void
  min: number
  max: number
  step: number
  unit?: string
  radioName?: string
  radioChecked?: boolean
  onRadioChange?: () => void
}) {
  return (
    <div className="flex items-center gap-2">
      {radioName !== undefined && (
        <input
          type="radio"
          name={radioName}
          checked={radioChecked}
          onChange={onRadioChange}
          className="w-3.5 h-3.5 accent-teal-500"
        />
      )}
      <span className="text-xs text-gray-500 dark:text-gray-400 w-36 shrink-0">{label}</span>
      <span className="text-xs text-gray-400 w-8 text-right">{min}{unit}</span>
      <input
        type="range"
        min={min * 100}
        max={max * 100}
        step={step * 100}
        value={Math.round(value * 100)}
        onChange={(e) => onChange(parseInt(e.target.value) / 100)}
        className="flex-1 h-1.5 bg-gray-200 rounded-lg appearance-none cursor-pointer dark:bg-gray-700 accent-teal-500"
      />
      <span className="text-xs text-gray-400 w-8">+{max}{unit}</span>
      <span className="font-mono text-xs w-14 text-right tabular-nums">
        {value >= 0 ? '+' : ''}{value.toFixed(2)}{unit}
      </span>
    </div>
  )
}

export function DewarpControls({
  dewarpResult,
  deskewResult,
  showGrid,
  onToggleGrid,
  onManualDewarp,
  onCombinedAdjust,
  onGroundTruth,
  onNext,
  isApplying,
}: DewarpControlsProps) {
  const [manualShear, setManualShear] = useState(0)
  const [gtFeedback, setGtFeedback] = useState<'correct' | 'incorrect' | null>(null)
  const [gtNotes, setGtNotes] = useState('')
  const [gtSaved, setGtSaved] = useState(false)
  const [showDetails, setShowDetails] = useState(false)
  const [showFineTune, setShowFineTune] = useState(false)

  // Fine-tuning rotation sliders (3 passes)
  const [p1Iterative, setP1Iterative] = useState(0)
  const [p2Residual, setP2Residual] = useState(0)
  const [p3Textline, setP3Textline] = useState(0)

  // Fine-tuning shear sliders (4 methods) + selected method
  const [shearValues, setShearValues] = useState<Record<string, number>>({
    vertical_edge: 0,
    projection: 0,
    hough_lines: 0,
    text_lines: 0,
  })
  const [selectedShearMethod, setSelectedShearMethod] = useState<string>('vertical_edge')

  // Initialize slider to auto-detected value when result arrives
  useEffect(() => {
    if (dewarpResult && dewarpResult.shear_degrees !== undefined) {
      setManualShear(dewarpResult.shear_degrees)
    }
  }, [dewarpResult?.shear_degrees])

  // Initialize fine-tuning sliders from deskew result
  useEffect(() => {
    if (deskewResult) {
      setP1Iterative(deskewResult.angle_iterative ?? 0)
      setP2Residual(deskewResult.angle_residual ?? 0)
      setP3Textline(deskewResult.angle_textline ?? 0)
    }
  }, [deskewResult])

  // Initialize shear sliders from dewarp detections
  useEffect(() => {
    if (dewarpResult?.detections) {
      const newValues = { ...shearValues }
      let bestMethod = selectedShearMethod
      let bestConf = -1
      for (const d of dewarpResult.detections) {
        if (d.method in newValues) {
          newValues[d.method] = d.shear_degrees
          if (d.confidence > bestConf) {
            bestConf = d.confidence
            bestMethod = d.method
          }
        }
      }
      setShearValues(newValues)
      // Select the method that was actually used, or the highest confidence
      if (dewarpResult.method_used && dewarpResult.method_used in newValues) {
        setSelectedShearMethod(dewarpResult.method_used)
      } else {
        setSelectedShearMethod(bestMethod)
      }
    }
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [dewarpResult?.detections])

  const rotationSum = p1Iterative + p2Residual + p3Textline
  const activeShear = shearValues[selectedShearMethod] ?? 0

  const handleGroundTruth = (isCorrect: boolean) => {
    setGtFeedback(isCorrect ? 'correct' : 'incorrect')
    if (isCorrect) {
      onGroundTruth({ is_correct: true })
      setGtSaved(true)
    }
  }

  const handleGroundTruthIncorrect = () => {
    onGroundTruth({
      is_correct: false,
      corrected_shear: manualShear !== 0 ? manualShear : undefined,
      notes: gtNotes || undefined,
    })
    setGtSaved(true)
  }

  const handleShearValueChange = (method: string, value: number) => {
    setShearValues((prev) => ({ ...prev, [method]: value }))
  }

  const handleFineTunePreview = () => {
    if (onCombinedAdjust) {
      onCombinedAdjust(rotationSum, activeShear)
    }
  }

  const wasRejected = dewarpResult && dewarpResult.method_used === 'none' && (dewarpResult.detections || []).length > 0
  const wasApplied = dewarpResult && dewarpResult.method_used !== 'none' && dewarpResult.method_used !== 'manual' && dewarpResult.method_used !== 'manual_combined'
  const detections = dewarpResult?.detections || []

  return (
    <div className="space-y-4">
      {/* Summary banner */}
      {dewarpResult && (
        <div className={`rounded-lg border p-4 ${
          wasRejected
            ? 'bg-amber-50 border-amber-200 dark:bg-amber-900/20 dark:border-amber-700'
            : wasApplied
              ? 'bg-green-50 border-green-200 dark:bg-green-900/20 dark:border-green-700'
              : 'bg-white border-gray-200 dark:bg-gray-800 dark:border-gray-700'
        }`}>
          {/* Status line */}
          <div className="flex items-center gap-2 mb-3">
            <span className={`text-lg ${wasRejected ? '' : wasApplied ? '' : ''}`}>
              {wasRejected ? '\u26A0\uFE0F' : wasApplied ? '\u2705' : '\u2796'}
            </span>
            <span className="text-sm font-medium text-gray-800 dark:text-gray-200">
              {wasRejected
                ? 'Quality Gate: Korrektur verworfen (Projektion nicht verbessert)'
                : wasApplied
                  ? `Korrektur angewendet: ${dewarpResult.shear_degrees.toFixed(2)}\u00B0`
                  : dewarpResult.method_used === 'manual' || dewarpResult.method_used === 'manual_combined'
                    ? `Manuelle Korrektur: ${dewarpResult.shear_degrees.toFixed(2)}\u00B0`
                    : 'Keine Korrektur noetig'}
            </span>
          </div>

          {/* Key metrics */}
          <div className="flex flex-wrap items-center gap-4 text-sm">
            <div>
              <span className="text-gray-500">Scherung:</span>{' '}
              <span className="font-mono font-medium">{dewarpResult.shear_degrees.toFixed(2)}\u00B0</span>
            </div>
            <div className="h-4 w-px bg-gray-300 dark:bg-gray-600" />
            <div>
              <span className="text-gray-500">Methode:</span>{' '}
              <span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-teal-100 text-teal-700 dark:bg-teal-900/40 dark:text-teal-300">
                {dewarpResult.method_used.includes('+')
                  ? `Ensemble (${dewarpResult.method_used.split('+').map(m => METHOD_LABELS[m] || m).join(' + ')})`
                  : METHOD_LABELS[dewarpResult.method_used] || dewarpResult.method_used}
              </span>
            </div>
            <div className="h-4 w-px bg-gray-300 dark:bg-gray-600" />
            <div className="flex items-center gap-1.5">
              <span className="text-gray-500">Konfidenz:</span>
              <ConfBar value={dewarpResult.confidence} />
            </div>
          </div>

          {/* Toggles row */}
          <div className="flex gap-2 mt-3">
            <button
              onClick={onToggleGrid}
              className={`text-xs px-3 py-1 rounded-full border transition-colors ${
                showGrid
                  ? 'bg-teal-100 border-teal-300 text-teal-700 dark:bg-teal-900/40 dark:border-teal-600 dark:text-teal-300'
                  : 'border-gray-300 text-gray-500 dark:border-gray-600 dark:text-gray-400'
              }`}
            >
              Raster
            </button>
            {detections.length > 0 && (
              <button
                onClick={() => setShowDetails(v => !v)}
                className={`text-xs px-3 py-1 rounded-full border transition-colors ${
                  showDetails
                    ? 'bg-blue-100 border-blue-300 text-blue-700 dark:bg-blue-900/40 dark:border-blue-600 dark:text-blue-300'
                    : 'border-gray-300 text-gray-500 dark:border-gray-600 dark:text-gray-400'
                }`}
              >
                Details ({detections.length} Methoden)
              </button>
            )}
          </div>

          {/* Detailed detections */}
          {showDetails && detections.length > 0 && (
            <div className="mt-3 pt-3 border-t border-gray-200 dark:border-gray-700">
              <div className="text-xs text-gray-500 mb-2">Einzelne Detektoren:</div>
              <div className="space-y-1.5">
                {detections.map((d: DewarpDetection) => {
                  const isUsed = dewarpResult.method_used.includes(d.method)
                  const aboveThreshold = d.confidence >= 0.5
                  return (
                    <div
                      key={d.method}
                      className={`flex items-center gap-3 text-xs px-2 py-1.5 rounded ${
                        isUsed
                          ? 'bg-teal-50 dark:bg-teal-900/20'
                          : 'bg-gray-50 dark:bg-gray-800'
                      }`}
                    >
                      <span className="w-4 text-center">
                        {isUsed ? '\u2713' : aboveThreshold ? '\u2012' : '\u2717'}
                      </span>
                      <span className={`w-40 ${isUsed ? 'font-medium text-gray-800 dark:text-gray-200' : 'text-gray-500'}`}>
                        {METHOD_LABELS[d.method] || d.method}
                      </span>
                      <span className="font-mono w-16 text-right">
                        {d.shear_degrees.toFixed(2)}\u00B0
                      </span>
                      <ConfBar value={d.confidence} />
                      {!aboveThreshold && (
                        <span className="text-gray-400 ml-1">(unter Schwelle)</span>
                      )}
                    </div>
                  )
                })}
              </div>
              {wasRejected && (
                <div className="mt-2 text-xs text-amber-600 dark:text-amber-400">
                  Die Korrektur wurde verworfen, weil die horizontale Projektions-Varianz nach Anwendung nicht besser war als vorher.
                </div>
              )}
            </div>
          )}
        </div>
      )}

      {/* Manual shear angle slider */}
      {dewarpResult && (
        <div className="bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700 p-4">
          <div className="text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">Scherwinkel (manuell)</div>
          <div className="flex items-center gap-3">
            <span className="text-xs text-gray-400 w-10 text-right">-2.0\u00B0</span>
            <input
              type="range"
              min={-200}
              max={200}
              step={5}
              value={Math.round(manualShear * 100)}
              onChange={(e) => setManualShear(parseInt(e.target.value) / 100)}
              className="flex-1 h-2 bg-gray-200 rounded-lg appearance-none cursor-pointer dark:bg-gray-700 accent-teal-500"
            />
            <span className="text-xs text-gray-400 w-10">+2.0\u00B0</span>
            <span className="font-mono text-sm w-16 text-right">{manualShear.toFixed(2)}\u00B0</span>
            <button
              onClick={() => onManualDewarp(manualShear)}
              disabled={isApplying}
              className="px-3 py-1.5 text-sm bg-teal-600 text-white rounded-md hover:bg-teal-700 disabled:opacity-50 transition-colors"
            >
              {isApplying ? '...' : 'Anwenden'}
            </button>
          </div>
          <p className="text-xs text-gray-400 mt-1">
            Scherung der vertikalen Achse in Grad. Positiv = Spalten nach rechts kippen, negativ = nach links.
          </p>
        </div>
      )}

      {/* Fine-tuning panel */}
      {dewarpResult && onCombinedAdjust && (
        <div className="bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700">
          <button
            onClick={() => setShowFineTune(v => !v)}
            className="w-full flex items-center justify-between p-4 text-left"
          >
            <div className="flex items-center gap-2">
              <span className="text-sm">&#9881;&#65039;</span>
              <span className="text-sm font-medium text-gray-700 dark:text-gray-300">Feinabstimmung</span>
              <span className="text-xs text-gray-400">(7 Regler)</span>
            </div>
            <span className="text-gray-400 text-sm">{showFineTune ? '\u25B2' : '\u25BC'}</span>
          </button>

          {showFineTune && (
            <div className="px-4 pb-4 space-y-5">
              {/* Rotation section */}
              <div>
                <div className="text-xs font-medium text-gray-500 dark:text-gray-400 uppercase tracking-wider mb-2">
                  Rotation (Begradigung)
                </div>
                <div className="space-y-2">
                  <FineTuneSlider
                    label="P1 Iterative Projection"
                    value={p1Iterative}
                    onChange={setP1Iterative}
                    min={-5}
                    max={5}
                    step={0.05}
                  />
                  <FineTuneSlider
                    label="P2 Word-Alignment"
                    value={p2Residual}
                    onChange={setP2Residual}
                    min={-3}
                    max={3}
                    step={0.05}
                  />
                  <FineTuneSlider
                    label="P3 Textline-Regression"
                    value={p3Textline}
                    onChange={setP3Textline}
                    min={-3}
                    max={3}
                    step={0.05}
                  />
                  <div className="flex items-center gap-2 pt-1 border-t border-gray-100 dark:border-gray-700">
                    <span className="text-xs text-gray-500 dark:text-gray-400 w-36 shrink-0">Summe Rotation</span>
                    <span className="font-mono text-sm font-medium text-teal-600 dark:text-teal-400">
                      {rotationSum >= 0 ? '+' : ''}{rotationSum.toFixed(2)}\u00B0
                    </span>
                  </div>
                </div>
              </div>

              {/* Shear section */}
              <div>
                <div className="text-xs font-medium text-gray-500 dark:text-gray-400 uppercase tracking-wider mb-2">
                  Scherung (Entzerrung) &mdash; einen Wert waehlen
                </div>
                <div className="space-y-2">
                  {SHEAR_METHOD_KEYS.map((method) => (
                    <FineTuneSlider
                      key={method}
                      label={METHOD_LABELS[method] || method}
                      value={shearValues[method]}
                      onChange={(v) => handleShearValueChange(method, v)}
                      min={-5}
                      max={5}
                      step={0.05}
                      radioName="shear-method"
                      radioChecked={selectedShearMethod === method}
                      onRadioChange={() => setSelectedShearMethod(method)}
                    />
                  ))}
                  <div className="flex items-center gap-2 pt-1 border-t border-gray-100 dark:border-gray-700">
                    <span className="text-xs text-gray-500 dark:text-gray-400 w-36 shrink-0">Gewaehlte Scherung</span>
                    <span className="font-mono text-sm font-medium text-teal-600 dark:text-teal-400">
                      {activeShear >= 0 ? '+' : ''}{activeShear.toFixed(2)}\u00B0
                    </span>
                    <span className="text-xs text-gray-400 ml-1">
                      ({METHOD_LABELS[selectedShearMethod]})
                    </span>
                  </div>
                </div>
              </div>

              {/* Preview + Save */}
              <div className="flex items-center gap-3 pt-2">
                <button
                  onClick={handleFineTunePreview}
                  disabled={isApplying}
                  className="px-4 py-2 text-sm bg-teal-600 text-white rounded-md hover:bg-teal-700 disabled:opacity-50 transition-colors"
                >
                  {isApplying ? 'Wird angewendet...' : 'Vorschau'}
                </button>
                <button
                  onClick={() => {
                    onGroundTruth({
                      is_correct: false,
                      corrected_shear: activeShear,
                      notes: `Fine-tuned: rotation=${rotationSum.toFixed(3)}, shear=${activeShear.toFixed(3)} (${selectedShearMethod})`,
                    })
                    setGtSaved(true)
                  }}
                  disabled={gtSaved}
                  className="px-4 py-2 text-sm bg-blue-600 text-white rounded-md hover:bg-blue-700 disabled:opacity-50 transition-colors"
                >
                  {gtSaved ? 'Gespeichert' : 'Als Ground Truth speichern'}
                </button>
                <span className="text-xs text-gray-400">
                  Rotation: {rotationSum >= 0 ? '+' : ''}{rotationSum.toFixed(2)}\u00B0 + Scherung: {activeShear >= 0 ? '+' : ''}{activeShear.toFixed(2)}\u00B0
                </span>
              </div>
            </div>
          )}
        </div>
      )}

      {/* Ground Truth */}
      {dewarpResult && !showFineTune && (
        <div className="bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700 p-4">
          <div className="text-sm font-medium text-gray-700 dark:text-gray-300 mb-2">
            Spalten vertikal ausgerichtet?
          </div>
          <p className="text-xs text-gray-400 mb-2">Pruefen ob die Spaltenraender jetzt senkrecht zum Raster stehen.</p>
          {!gtSaved ? (
            <div className="space-y-3">
              <div className="flex gap-2">
                <button
                  onClick={() => handleGroundTruth(true)}
                  className={`px-4 py-1.5 rounded-md text-sm font-medium transition-colors ${
                    gtFeedback === 'correct'
                      ? 'bg-green-100 text-green-700 ring-2 ring-green-400'
                      : 'bg-gray-100 text-gray-600 hover:bg-green-50 dark:bg-gray-700 dark:text-gray-300'
                  }`}
                >
                  Ja
                </button>
                <button
                  onClick={() => handleGroundTruth(false)}
                  className={`px-4 py-1.5 rounded-md text-sm font-medium transition-colors ${
                    gtFeedback === 'incorrect'
                      ? 'bg-red-100 text-red-700 ring-2 ring-red-400'
                      : 'bg-gray-100 text-gray-600 hover:bg-red-50 dark:bg-gray-700 dark:text-gray-300'
                  }`}
                >
                  Nein
                </button>
              </div>
              {gtFeedback === 'incorrect' && (
                <div className="space-y-2">
                  <textarea
                    value={gtNotes}
                    onChange={(e) => setGtNotes(e.target.value)}
                    placeholder="Notizen zur Korrektur..."
                    className="w-full text-sm border border-gray-300 dark:border-gray-600 rounded-md p-2 bg-white dark:bg-gray-900 text-gray-800 dark:text-gray-200"
                    rows={2}
                  />
                  <button
                    onClick={handleGroundTruthIncorrect}
                    className="text-sm px-3 py-1 bg-red-600 text-white rounded-md hover:bg-red-700 transition-colors"
                  >
                    Feedback speichern
                  </button>
                </div>
              )}
            </div>
          ) : (
            <div className="text-sm text-green-600 dark:text-green-400">
              Feedback gespeichert
            </div>
          )}
        </div>
      )}

      {/* Next button */}
      {dewarpResult && (
        <div className="flex justify-end">
          <button
            onClick={onNext}
            className="px-6 py-2 bg-teal-600 text-white rounded-lg hover:bg-teal-700 font-medium transition-colors"
          >
            Uebernehmen & Weiter &rarr;
          </button>
        </div>
      )}
    </div>
  )
}