import React, { useMemo, useState } from 'react'
import {
  filterFrameworkPrograms,
  frameworkProgramOptionLabel,
  frameworkSessionDurationLabel,
} from '../../utils/frameworkProgramListHelpers'
import { formatDurationDisplay } from '../../utils/trainingDurationUtils'

/**
 * Modal: geplante Einheiten aus einem Trainingsrahmenprogramm (Blueprint-Slots) erzeugen.
 */
export default function TrainingPlanningFrameworkImportModal({
  open,
  frameworkProgramsList,
  catalogFocusAreas = [],
  catalogTrainingTypes = [],
  catalogTargetGroups = [],
  fwImportProgramId,
  onProgramChange,
  fwImportLoading,
  fwImportDetail,
  fwImportSelectedSlots,
  onToggleSlot,
  fwImportSlotDates,
  onSlotDateChange,
  fwImportStartDate,
  onFwImportStartDateChange,
  fwImportIntervalDays,
  onFwImportIntervalDaysChange,
  fwImportSubmitting,
  onApplyDateSuggestions,
  onSubmit,
  onClose,
}) {
  const [filterQuery, setFilterQuery] = useState('')
  const [filterFocusIds, setFilterFocusIds] = useState([])
  const [filterTypeIds, setFilterTypeIds] = useState([])
  const [filterTargetGroupIds, setFilterTargetGroupIds] = useState([])
  const [filterDurationMin, setFilterDurationMin] = useState('')

  const filteredPrograms = useMemo(
    () =>
      filterFrameworkPrograms(frameworkProgramsList, {
        query: filterQuery,
        focusAreaIds: filterFocusIds,
        trainingTypeIds: filterTypeIds,
        targetGroupIds: filterTargetGroupIds,
        durationTargetMin: filterDurationMin === '' ? null : parseInt(filterDurationMin, 10),
      }),
    [
      frameworkProgramsList,
      filterQuery,
      filterFocusIds,
      filterTypeIds,
      filterTargetGroupIds,
      filterDurationMin,
    ]
  )

  const selectedProgramSummary = useMemo(() => {
    if (!fwImportProgramId) return null
    return (frameworkProgramsList || []).find((p) => String(p.id) === String(fwImportProgramId))
  }, [frameworkProgramsList, fwImportProgramId])

  const toggleId = (list, setList, id) => {
    const s = String(id)
    setList((prev) => (prev.includes(s) ? prev.filter((x) => x !== s) : [...prev, s]))
  }

  if (!open) return null

  return (
    <div
      data-testid="planning-framework-import-modal"
      style={{
        position: 'fixed',
        top: 0,
        left: 0,
        right: 0,
        bottom: 0,
        background: 'rgba(0,0,0,0.5)',
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
        zIndex: 1010,
        padding: '1rem',
        overflowY: 'auto',
      }}
    >
      <div
        style={{
          background: 'var(--surface)',
          borderRadius: '12px',
          padding: 'clamp(14px, 3vw, 1.75rem)',
          maxWidth: 'min(680px, 100%)',
          width: '100%',
          maxHeight: '90vh',
          overflowY: 'auto',
          boxSizing: 'border-box',
          minWidth: 0,
        }}
      >
        <h2 style={{ marginBottom: '0.65rem' }}>Sessions aus Rahmen übernehmen</h2>
        <p style={{ color: 'var(--text2)', fontSize: '0.9rem', marginBottom: '1rem', lineHeight: 1.5 }}>
          Wähle ein Trainingsrahmenprogramm und eine oder mehrere Sessions. Pro Session entsteht eine{' '}
          <strong>eigene geplante Einheit</strong> in der aktuellen Gruppe (Kopie des Ablaufs). Die{' '}
          <strong>Verknüpfung zum Rahmen-Slot</strong> bleibt sichtbar.
        </p>

        <details className="planning-filter-help" style={{ marginBottom: '1rem' }}>
          <summary className="planning-filter-help__summary">Rahmen filtern (optional)</summary>
          <div className="planning-filter-help__body" style={{ display: 'grid', gap: '10px' }}>
            <div className="form-row" style={{ marginBottom: 0 }}>
              <label className="form-label">Suche (Titel, Ziele, Katalog)</label>
              <input
                className="form-input"
                value={filterQuery}
                onChange={(e) => setFilterQuery(e.target.value)}
                placeholder="z. B. Gürtel, Koordination …"
                disabled={fwImportSubmitting}
              />
            </div>
            <div className="form-row" style={{ marginBottom: 0 }}>
              <label className="form-label">Ziel-Session-Dauer (Minuten)</label>
              <input
                type="number"
                min={0}
                className="form-input"
                value={filterDurationMin}
                onChange={(e) => setFilterDurationMin(e.target.value)}
                placeholder="z. B. 90"
                disabled={fwImportSubmitting}
              />
              <p className="form-sub" style={{ marginTop: '4px' }}>
                Zeigt Programme, deren hinterlegte Session-Dauer in etwa passt (±10 Min).
              </p>
            </div>
            {catalogFocusAreas.length > 0 ? (
              <div>
                <span className="form-label" style={{ display: 'block', marginBottom: '6px' }}>
                  Fokusbereich
                </span>
                <div className="framework-catalog-checkgrid">
                  {catalogFocusAreas.map((fa) => (
                    <label key={fa.id} className="framework-catalog-check">
                      <input
                        type="checkbox"
                        checked={filterFocusIds.includes(String(fa.id))}
                        onChange={() => toggleId(filterFocusIds, setFilterFocusIds, fa.id)}
                        disabled={fwImportSubmitting}
                      />
                      <span>{fa.name}</span>
                    </label>
                  ))}
                </div>
              </div>
            ) : null}
            {catalogTrainingTypes.length > 0 ? (
              <div>
                <span className="form-label" style={{ display: 'block', marginBottom: '6px' }}>
                  Trainingsart
                </span>
                <div className="framework-catalog-checkgrid">
                  {catalogTrainingTypes.map((t) => (
                    <label key={t.id} className="framework-catalog-check">
                      <input
                        type="checkbox"
                        checked={filterTypeIds.includes(String(t.id))}
                        onChange={() => toggleId(filterTypeIds, setFilterTypeIds, t.id)}
                        disabled={fwImportSubmitting}
                      />
                      <span>{t.name}</span>
                    </label>
                  ))}
                </div>
              </div>
            ) : null}
            {catalogTargetGroups.length > 0 ? (
              <div>
                <span className="form-label" style={{ display: 'block', marginBottom: '6px' }}>
                  Zielgruppe
                </span>
                <div className="framework-catalog-checkgrid">
                  {catalogTargetGroups.map((tg) => (
                    <label key={tg.id} className="framework-catalog-check">
                      <input
                        type="checkbox"
                        checked={filterTargetGroupIds.includes(String(tg.id))}
                        onChange={() => toggleId(filterTargetGroupIds, setFilterTargetGroupIds, tg.id)}
                        disabled={fwImportSubmitting}
                      />
                      <span>{tg.name}</span>
                    </label>
                  ))}
                </div>
              </div>
            ) : null}
            <p className="form-sub" style={{ margin: 0 }}>
              {filteredPrograms.length} von {frameworkProgramsList.length} Rahmenprogramm(en) sichtbar.
              Entwicklungsziele sind freie Texte — die Suche durchsucht auch Ziel-Titel.
            </p>
          </div>
        </details>

        <div className="form-row">
          <label className="form-label">Rahmenprogramm</label>
          <select
            className="form-input"
            value={fwImportProgramId}
            onChange={(e) => onProgramChange(e.target.value)}
            disabled={fwImportLoading || fwImportSubmitting}
          >
            <option value="">Bitte wählen…</option>
            {filteredPrograms.map((fp) => (
              <option key={fp.id} value={String(fp.id)}>
                {frameworkProgramOptionLabel(fp)}
              </option>
            ))}
          </select>
          {selectedProgramSummary ? (
            <p className="form-sub" style={{ marginTop: '6px' }}>
              Session-Dauer: <strong>{frameworkSessionDurationLabel(selectedProgramSummary)}</strong>
              {selectedProgramSummary.goal_titles_agg ? (
                <>
                  {' '}
                  · Ziele: {selectedProgramSummary.goal_titles_agg}
                </>
              ) : null}
            </p>
          ) : null}
        </div>

        {fwImportLoading ? (
          <p style={{ color: 'var(--text2)', marginTop: '1rem' }}>Laden der Sessions…</p>
        ) : fwImportDetail?.slots?.length ? (
          <>
            <fieldset style={{ border: 'none', margin: '1rem 0', padding: 0 }}>
              <legend className="form-label" style={{ padding: 0, marginBottom: '0.5rem' }}>
                Sessions (mit Ablauf)
              </legend>
              <ul style={{ listStyle: 'none', padding: 0, margin: 0 }}>
                {[...fwImportDetail.slots]
                  .sort((a, b) => (a.sort_order ?? 0) - (b.sort_order ?? 0))
                  .map((slot) => {
                    const hasBp = !!slot.blueprint_training_unit_id
                    const checked = fwImportSelectedSlots.has(slot.id)
                    const label =
                      (slot.title || '').trim() || `Session ${(slot.sort_order ?? 0) + 1}`
                    const slotDur =
                      slot.planned_duration_min != null
                        ? formatDurationDisplay(slot.planned_duration_min)
                        : null
                    return (
                      <li key={slot.id} style={{ marginBottom: '10px' }}>
                        <label
                          style={{
                            display: 'flex',
                            gap: '10px',
                            alignItems: 'flex-start',
                            cursor: hasBp ? 'pointer' : 'not-allowed',
                            opacity: hasBp ? 1 : 0.55,
                          }}
                        >
                          <input
                            type="checkbox"
                            checked={checked}
                            disabled={!hasBp || fwImportSubmitting}
                            onChange={() => onToggleSlot(slot)}
                            style={{ marginTop: '0.2rem', flexShrink: 0 }}
                          />
                          <span style={{ flex: 1, minWidth: 0 }}>
                            <strong>{label}</strong>
                            {slotDur ? (
                              <span
                                style={{
                                  marginLeft: '8px',
                                  fontSize: '0.82rem',
                                  color: 'var(--text2)',
                                  fontWeight: 500,
                                }}
                              >
                                · {slotDur}
                              </span>
                            ) : null}
                            {!hasBp ? (
                              <span style={{ display: 'block', fontSize: '0.82rem', color: 'var(--danger)' }}>
                                Ohne Session-Ablauf — Übernahme nicht möglich.
                              </span>
                            ) : null}
                            {hasBp && checked ? (
                              <span style={{ display: 'block', marginTop: '6px' }}>
                                <span className="form-label" style={{ fontSize: '0.78rem' }}>
                                  Termin (Datum)
                                </span>
                                <input
                                  type="date"
                                  className="form-input"
                                  style={{ maxWidth: '200px', marginTop: '4px' }}
                                  value={fwImportSlotDates[String(slot.id)] || ''}
                                  onChange={(e) => onSlotDateChange(String(slot.id), e.target.value)}
                                  disabled={fwImportSubmitting}
                                />
                              </span>
                            ) : null}
                          </span>
                        </label>
                      </li>
                    )
                  })}
              </ul>
            </fieldset>

            <div
              className="responsive-grid-3"
              style={{
                marginBottom: '0.75rem',
                padding: '12px',
                background: 'var(--surface2)',
                borderRadius: '8px',
              }}
            >
              <div className="form-row">
                <label className="form-label">Startdatum (Vorschlag)</label>
                <input
                  type="date"
                  className="form-input"
                  value={fwImportStartDate}
                  onChange={(e) => onFwImportStartDateChange(e.target.value)}
                  disabled={fwImportSubmitting}
                />
              </div>
              <div className="form-row">
                <label className="form-label">Abstand (Tage)</label>
                <input
                  type="number"
                  min={0}
                  className="form-input"
                  value={fwImportIntervalDays}
                  onChange={(e) => onFwImportIntervalDaysChange(parseInt(e.target.value, 10) || 0)}
                  disabled={fwImportSubmitting}
                />
              </div>
              <div className="form-row" style={{ alignSelf: 'end' }}>
                <button
                  type="button"
                  className="btn btn-secondary"
                  style={{ width: '100%' }}
                  disabled={fwImportSubmitting}
                  onClick={onApplyDateSuggestions}
                >
                  Datumsvorschläge setzen
                </button>
              </div>
            </div>
          </>
        ) : fwImportProgramId ? (
          <p style={{ color: 'var(--text2)', marginTop: '0.75rem' }}>Keine Sessions in diesem Programm.</p>
        ) : null}

        <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem', marginTop: '1.25rem' }}>
          <button
            type="button"
            className="btn btn-primary"
            disabled={fwImportSubmitting || !fwImportDetail}
            onClick={onSubmit}
          >
            {fwImportSubmitting ? 'Übernehmen…' : 'In Planung übernehmen'}
          </button>
          <button type="button" className="btn btn-secondary" disabled={fwImportSubmitting} onClick={onClose}>
            Abbrechen
          </button>
        </div>
      </div>
    </div>
  )
}