import React, { useEffect, useMemo, useState } from 'react'
import { Link } from 'react-router-dom'
import TrainingPlanExerciseVisibilityPanel from '../TrainingPlanExerciseVisibilityPanel'
import TrainingUnitSectionsEditor from '../TrainingUnitSectionsEditor'
import { activeClubMemberships } from '../../utils/activeClub'
import { canDeleteLibraryContent } from '../../utils/libraryContentPermissions'
import { frameworkLineageText } from '../../utils/trainingPlanningPageHelpers'

/**
 * Großes Modal: Neue Trainingseinheit / Einheit bearbeiten (Planung, Trainer, Abschnitte, Durchführung, Notizen).
 */
export default function TrainingPlanningUnitFormModal({
  open,
  editingUnit,
  formData,
  updateFormField,
  setFormData,
  onSubmit,
  onCancel,
  draftPlanTemplateId,
  onDraftTemplateSelect,
  planTemplates,
  onDeletePlanTemplate,
  clubDirectory,
  clubDirectoryForCo,
  planningModalClubId,
  user,
  onMetaRefresh,
  sectionsEditMode,
  setSectionsEditMode,
  onSaveAsTemplate,
  onRequestTrainingModulePick,
  onRequestExercisePick,
  onPeekExercise,
}) {
  const [newTplVisibility, setNewTplVisibility] = useState('private')
  const [newTplClubId, setNewTplClubId] = useState('')

  const memberClubs = useMemo(() => activeClubMemberships(user?.clubs), [user?.clubs])
  const roleLc = String(user?.role || '').toLowerCase()
  const isSuperadmin = roleLc === 'superadmin'

  useEffect(() => {
    if (!open) return
    if (planningModalClubId != null && planningModalClubId !== '') {
      setNewTplClubId(String(planningModalClubId))
    } else if (memberClubs.length === 1) {
      setNewTplClubId(String(memberClubs[0].id))
    }
  }, [open, planningModalClubId, memberClubs])

  if (!open) return null

  return (
    <div
      data-testid="planning-unit-form-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: 1000,
        padding: '1rem',
        overflowY: 'auto',
      }}
    >
      <div
        style={{
          background: 'var(--surface)',
          borderRadius: '12px',
          padding: 'clamp(12px, 3vw, 2rem)',
          maxWidth: 'min(1100px, 100%)',
          width: '100%',
          maxHeight: '92vh',
          overflowY: 'auto',
          margin: 'max(0px, env(safe-area-inset-top, 0px)) auto',
          boxSizing: 'border-box',
          minWidth: 0,
        }}
      >
        <h2 style={{ marginBottom: '1rem' }}>
          {editingUnit ? 'Trainingseinheit bearbeiten' : 'Neue Trainingseinheit'}
        </h2>

        {editingUnit?.origin_framework_slot_id
          ? (() => {
              const L = frameworkLineageText(editingUnit)
              return (
                <div
                  className="card"
                  style={{
                    marginBottom: '1.1rem',
                    padding: '12px 14px',
                    background: 'var(--surface2)',
                    fontSize: '0.9rem',
                    lineHeight: 1.5,
                  }}
                >
                  <strong style={{ color: 'var(--text1)' }}>Herkunft:</strong>{' '}
                  {editingUnit.origin_framework_program_id ? (
                    <Link
                      to={`/planning/framework-programs/${editingUnit.origin_framework_program_id}`}
                      style={{ color: 'var(--accent-dark)' }}
                    >
                      {L.fpTitle}
                    </Link>
                  ) : (
                    L.fpTitle
                  )}
                  <span style={{ color: 'var(--text2)' }}> · {L.slotBit}</span>
                  <p style={{ margin: '0.5rem 0 0', fontSize: '0.82rem', color: 'var(--text2)' }}>
                    Inhalt stammt aus dem Session-Blueprint des Rahmenprogramms. Änderungen gelten nur für diese
                    geplante Einheit; die Zuordnung zum Rahmen bleibt zur Nachverfolgung erhalten.
                  </p>
                </div>
              )
            })()
          : null}

        {!editingUnit && (
          <div className="training-planning-template-panel" style={{ marginBottom: '1.35rem' }}>
            <label className="form-label training-planning-template-panel__label" htmlFor="planning-draft-template">
              Vorlage für den Ablauf
            </label>
            <select
              id="planning-draft-template"
              className="form-input training-planning-template-panel__select"
              value={draftPlanTemplateId}
              onChange={(e) => onDraftTemplateSelect(e.target.value)}
            >
              <option value="">Ohne Vorlage — leere Gliederung (ein Abschnitt)</option>
              {planTemplates.map((t) => {
                const v = String(t.visibility || 'club').toLowerCase()
                const vLabel = v === 'private' ? 'Privat' : v === 'official' ? 'Offiziell' : 'Verein'
                return (
                  <option key={t.id} value={String(t.id)}>
                    {t.name}
                    {typeof t.sections_count === 'number' ? ` · ${t.sections_count} Abschn.` : ''}{' '}
                    · {vLabel}
                  </option>
                )
              })}
            </select>
            <p className="training-planning-template-panel__help">
              Übernimmt nur die <strong>Sektionsstruktur</strong> aus der Bibliothek; Übungen trägst du unten bei den
              Abschnitten ein. Gespeicherte Vorlagen kannst du unter Planung später erweitern.
            </p>
          </div>
        )}

        {planTemplates.length > 0 && typeof onDeletePlanTemplate === 'function' ? (
          <details
            className="card"
            style={{
              marginBottom: '1.35rem',
              padding: '12px 14px',
              background: 'var(--surface2)',
              border: '1px solid var(--border)',
            }}
          >
            <summary style={{ cursor: 'pointer', fontWeight: 600, color: 'var(--text1)' }}>
              Gespeicherte Vorlagen löschen
            </summary>
            <p style={{ margin: '0.65rem 0 0.75rem', fontSize: '0.82rem', color: 'var(--text2)', lineHeight: 1.45 }}>
              Entfernen nach Rolle: eigene private Vorlagen; Vereins­inhalte als Vereins­admin; offizielle nur als
              Plattform‑Admin. Einheiten mit Verweis behalten den Ablauf; die Vorlage wird entkoppelt.
            </p>
            <ul style={{ listStyle: 'none', margin: 0, padding: 0 }}>
              {planTemplates.map((t, ti) => {
                const canDel = user && canDeleteLibraryContent(user, t)
                return (
                  <li
                    key={t.id}
                    style={{
                      display: 'flex',
                      alignItems: 'center',
                      justifyContent: 'space-between',
                      gap: '10px',
                      padding: '8px 0',
                      borderTop: ti === 0 ? 'none' : '1px solid var(--border)',
                    }}
                  >
                    <span style={{ minWidth: 0, flex: 1, fontSize: '0.9rem' }}>
                      <strong style={{ color: 'var(--text1)' }}>{t.name}</strong>
                      <span style={{ fontSize: '0.78rem', color: 'var(--text3)', marginLeft: '6px' }}>
                        (
                        {String(t.visibility || 'club').toLowerCase() === 'private'
                          ? 'Privat'
                          : String(t.visibility || 'club').toLowerCase() === 'official'
                            ? 'Offiziell'
                            : 'Verein'}
                        )
                      </span>
                      {typeof t.sections_count === 'number' ? (
                        <span style={{ fontSize: '0.82rem', color: 'var(--text2)', marginLeft: '6px' }}>
                          · {t.sections_count} Abschn.
                        </span>
                      ) : null}
                    </span>
                    {canDel ? (
                      <button
                        type="button"
                        className="btn btn-danger"
                        style={{ flexShrink: 0, padding: '6px 12px', fontSize: '0.82rem' }}
                        onClick={() => onDeletePlanTemplate(t)}
                      >
                        Löschen
                      </button>
                    ) : (
                      <span style={{ fontSize: '0.78rem', color: 'var(--text3)', flexShrink: 0 }}>nur Lesen</span>
                    )}
                  </li>
                )
              })}
            </ul>
          </details>
        ) : null}

        <form onSubmit={onSubmit}>
          <h3 style={{ marginBottom: '1rem' }}>Planung</h3>

          <div className="responsive-grid-3" style={{ marginBottom: '1rem' }}>
            <div className="form-row">
              <label className="form-label">Datum *</label>
              <input
                type="date"
                className="form-input"
                value={formData.planned_date}
                onChange={(e) => updateFormField('planned_date', e.target.value)}
                required
              />
            </div>

            <div className="form-row">
              <label className="form-label">Von</label>
              <input
                type="time"
                className="form-input"
                value={formData.planned_time_start}
                onChange={(e) => updateFormField('planned_time_start', e.target.value)}
              />
            </div>

            <div className="form-row">
              <label className="form-label">Bis</label>
              <input
                type="time"
                className="form-input"
                value={formData.planned_time_end}
                onChange={(e) => updateFormField('planned_time_end', e.target.value)}
              />
            </div>
          </div>

          <div className="form-row">
            <label className="form-label">Trainingsfokus</label>
            <input
              type="text"
              className="form-input"
              value={formData.planned_focus}
              onChange={(e) => updateFormField('planned_focus', e.target.value)}
              placeholder="z.B. Grundlagen, Kinder altersgerecht"
            />
          </div>

          <div
            className="card"
            style={{
              marginTop: '1.25rem',
              marginBottom: '0.25rem',
              padding: '12px 14px',
              background: 'var(--surface2)',
            }}
          >
            <h3 style={{ margin: '0 0 10px', fontSize: '1rem' }}>Trainerzuordnung (diese Einheit)</h3>
            <div className="form-row">
              <label className="form-label">Leitung</label>
              <select
                className="form-input"
                value={formData.lead_trainer_profile_id}
                onChange={(e) => updateFormField('lead_trainer_profile_id', e.target.value)}
                disabled={!editingUnit && !formData.group_id}
              >
                <option value="">Standard (Haupttrainer der Gruppe)</option>
                {clubDirectory.map((m) => {
                  const idStr = String(m.id)
                  return (
                    <option key={idStr} value={idStr}>
                      {(m.name || '').trim() || m.email || `Profil ${m.id}`}
                    </option>
                  )
                })}
              </select>
              <p style={{ fontSize: '0.8rem', color: 'var(--text2)', marginTop: '0.35rem', lineHeight: 1.45 }}>
                Für Vertretungen genügt in der Regel die Vereinsmitgliedschaft; Zuweisen dürfen u. a. Haupt-/Co‑Trainer
                dieser Gruppe, der/die Ersteller:in der Einheit oder Vereinsadmins.
              </p>
            </div>
            <div className="form-row" style={{ marginTop: '0.75rem' }}>
              <label style={{ display: 'flex', alignItems: 'center', gap: '8px', cursor: 'pointer' }}>
                <input
                  type="checkbox"
                  checked={formData.session_assistants_inherit}
                  onChange={(e) => updateFormField('session_assistants_inherit', e.target.checked)}
                />
                <span style={{ fontSize: '0.9rem', color: 'var(--text1)' }}>
                  Co-Trainer wie in der Trainingsgruppe (Standard)
                </span>
              </label>
            </div>
            {!formData.session_assistants_inherit ? (
              <div style={{ marginTop: '10px', maxHeight: '200px', overflowY: 'auto' }}>
                {clubDirectoryForCo.map((m) => {
                  const mid = typeof m.id === 'number' ? m.id : parseInt(String(m.id), 10)
                  const labelText = `${(m.name || '').trim() || m.email || `Profil ${mid}`}`
                  const isOn = Number.isFinite(mid) && formData.session_assistant_profile_ids.includes(mid)
                  return (
                    <label
                      key={`co-${mid}`}
                      style={{
                        display: 'flex',
                        alignItems: 'center',
                        gap: '8px',
                        fontSize: '0.875rem',
                        marginBottom: '6px',
                        cursor: 'pointer',
                        color: 'var(--text1)',
                      }}
                    >
                      <input
                        type="checkbox"
                        checked={isOn}
                        onChange={() => {
                          setFormData((prev) => {
                            const was = prev.session_assistant_profile_ids.includes(mid)
                            const nextIds = was
                              ? prev.session_assistant_profile_ids.filter((x) => x !== mid)
                              : [...prev.session_assistant_profile_ids, mid].sort((a, b) => a - b)
                            return { ...prev, session_assistant_profile_ids: nextIds }
                          })
                        }}
                      />
                      <span>{labelText}</span>
                    </label>
                  )
                })}
              </div>
            ) : null}
            {!clubDirectory.length ? (
              <p style={{ margin: '10px 0 0', fontSize: '0.82rem', color: 'var(--text3)', lineHeight: 1.4 }}>
                Keine Einträge im Vereins-Mitgliederverzeichnis oder noch nicht geladen (nur für Vereinsinterne).
              </p>
            ) : null}
          </div>

          <TrainingPlanExerciseVisibilityPanel
            sections={formData.sections}
            targetClubId={planningModalClubId}
            user={user}
            onMetaRefresh={onMetaRefresh}
          />

          <div style={{ marginTop: '2rem' }}>
            {editingUnit ? (
              <div style={{ marginBottom: '1rem' }}>
                <div
                  role="radiogroup"
                  aria-label="Modus für Abschnitte und Übungen"
                  style={{
                    display: 'flex',
                    flexWrap: 'wrap',
                    alignItems: 'center',
                    gap: '10px',
                  }}
                >
                  <span className="form-label" style={{ marginBottom: 0, fontSize: '0.82rem' }}>
                    Ablauf bearbeiten als
                  </span>
                  <div
                    style={{
                      display: 'inline-flex',
                      borderRadius: '10px',
                      border: '1.5px solid var(--border2)',
                      overflow: 'hidden',
                      background: 'var(--surface2)',
                    }}
                  >
                    {[
                      { id: 'planning', label: 'Planung' },
                      { id: 'debrief', label: 'Nachbereitung' },
                    ].map((opt, i) => (
                      <button
                        key={opt.id}
                        type="button"
                        role="radio"
                        aria-checked={sectionsEditMode === opt.id}
                        onClick={() => setSectionsEditMode(opt.id)}
                        style={{
                          border: 'none',
                          padding: '8px 14px',
                          fontWeight: 600,
                          fontSize: '0.85rem',
                          cursor: 'pointer',
                          background: sectionsEditMode === opt.id ? 'var(--accent-dark)' : 'transparent',
                          color: sectionsEditMode === opt.id ? '#fff' : 'var(--text1)',
                          whiteSpace: 'nowrap',
                          ...(i > 0 ? { borderLeft: '1.5px solid var(--border2)' } : {}),
                        }}
                      >
                        {opt.label}
                      </button>
                    ))}
                  </div>
                </div>
                <p style={{ margin: '0.35rem 0 0', fontSize: '0.82rem', color: 'var(--text3)', lineHeight: 1.45 }}>
                  {sectionsEditMode === 'debrief'
                    ? 'Ist‑Minuten rechts in derselben Spaltenbreite wie „Min“ (Plan); Abweichungen als Text über die volle Breite.'
                    : 'Ablauf, Übungen und geplante Minuten. Ist‑Werte und Abweichungen unter „Nachbereitung“.'}
                </p>
              </div>
            ) : null}
            <TrainingUnitSectionsEditor
              heading="Abschnitte & Übungen"
              headingAccessory={
                <>
                  <div
                    style={{
                      display: 'flex',
                      flexWrap: 'wrap',
                      alignItems: 'flex-end',
                      gap: '10px',
                      marginBottom: '10px',
                    }}
                  >
                    <div className="form-row" style={{ marginBottom: 0, minWidth: 'min(160px, 100%)' }}>
                      <label className="form-label" style={{ fontSize: '0.82rem' }}>
                        Neue Vorlage: Sichtbarkeit
                      </label>
                      <select
                        className="form-input"
                        value={newTplVisibility}
                        onChange={(e) => {
                          const v = e.target.value
                          setNewTplVisibility(v)
                          if (v === 'club' && !newTplClubId && planningModalClubId != null) {
                            setNewTplClubId(String(planningModalClubId))
                          }
                        }}
                      >
                        <option value="private">Privat (nur du)</option>
                        <option value="club">Verein</option>
                        {isSuperadmin ? <option value="official">Offiziell (global)</option> : null}
                      </select>
                    </div>
                    {newTplVisibility === 'club' ? (
                      <div className="form-row" style={{ marginBottom: 0, flex: '1 1 200px' }}>
                        <label className="form-label" style={{ fontSize: '0.82rem' }}>
                          Verein
                        </label>
                        <select
                          className="form-input"
                          value={newTplClubId}
                          onChange={(e) => setNewTplClubId(e.target.value)}
                        >
                          <option value="">— Verein wählen —</option>
                          {memberClubs.map((c) => (
                            <option key={c.id} value={String(c.id)}>
                              {c.name || `Verein #${c.id}`}
                            </option>
                          ))}
                        </select>
                      </div>
                    ) : null}
                    <button
                      type="button"
                      className="btn btn-secondary"
                      style={{ marginBottom: '2px' }}
                      onClick={() =>
                        onSaveAsTemplate?.({
                          visibility: newTplVisibility,
                          club_id:
                            newTplVisibility === 'club' && newTplClubId
                              ? parseInt(newTplClubId, 10)
                              : null,
                        })
                      }
                    >
                      Vorlage aus Aufbau speichern
                    </button>
                  </div>
                </>
              }
              sections={formData.sections}
              wideExerciseGrid
              onSectionsChange={(updater) =>
                setFormData((prev) => ({
                  ...prev,
                  sections: updater(prev.sections),
                }))
              }
              onRequestTrainingModulePick={onRequestTrainingModulePick}
              onRequestExercisePick={onRequestExercisePick}
              onPeekExercise={onPeekExercise}
              showExecutionExtras={Boolean(editingUnit) && sectionsEditMode === 'debrief'}
              enableParallelPhaseControls
            />
          </div>

          <div style={{ marginBottom: '1.75rem' }} />

          {editingUnit && (
            <>
              <h3 style={{ marginTop: '0.5rem', marginBottom: '1rem' }}>Durchführung</h3>

              <div className="responsive-grid-4" style={{ marginBottom: '1rem' }}>
                <div className="form-row">
                  <label className="form-label">Tatsächliches Datum</label>
                  <input
                    type="date"
                    className="form-input"
                    value={formData.actual_date}
                    onChange={(e) => updateFormField('actual_date', e.target.value)}
                  />
                </div>

                <div className="form-row">
                  <label className="form-label">Von</label>
                  <input
                    type="time"
                    className="form-input"
                    value={formData.actual_time_start}
                    onChange={(e) => updateFormField('actual_time_start', e.target.value)}
                  />
                </div>

                <div className="form-row">
                  <label className="form-label">Bis</label>
                  <input
                    type="time"
                    className="form-input"
                    value={formData.actual_time_end}
                    onChange={(e) => updateFormField('actual_time_end', e.target.value)}
                  />
                </div>

                <div className="form-row">
                  <label className="form-label">Teilnehmer</label>
                  <input
                    type="number"
                    className="form-input"
                    value={formData.attendance_count}
                    onChange={(e) => updateFormField('attendance_count', e.target.value)}
                  />
                </div>
              </div>

              <div className="form-row">
                <label className="form-label">Status</label>
                <select
                  className="form-input"
                  value={formData.status}
                  onChange={(e) => updateFormField('status', e.target.value)}
                >
                  <option value="planned">Geplant</option>
                  <option value="completed">Durchgeführt</option>
                  <option value="cancelled">Abgesagt</option>
                </select>
              </div>

              {formData.status === 'completed' ? (
                <div className="form-row" style={{ marginTop: '0.75rem' }}>
                  <label
                    style={{
                      display: 'flex',
                      alignItems: 'flex-start',
                      gap: '10px',
                      cursor: 'pointer',
                      lineHeight: 1.45,
                    }}
                  >
                    <input
                      type="checkbox"
                      checked={!!formData.debrief_completed}
                      onChange={(e) => updateFormField('debrief_completed', e.target.checked)}
                      style={{ marginTop: '3px' }}
                    />
                    <span>
                      <strong>Rückschau erledigt</strong>
                      <span className="muted" style={{ display: 'block', fontSize: '0.82rem', marginTop: '5px' }}>
                        Wenn angehakt, erscheint die Einheit nicht mehr unter „Offene Rückschau“ auf dem Dashboard
                        (Nachbereitung gilt als abgeschlossen).
                      </span>
                    </span>
                  </label>
                </div>
              ) : null}
            </>
          )}

          <h3 style={{ marginTop: '2rem', marginBottom: '1rem' }}>Notizen</h3>

          <div className="form-row">
            <label className="form-label">Öffentliche Notizen</label>
            <textarea
              className="form-input"
              rows={3}
              value={formData.notes}
              onChange={(e) => updateFormField('notes', e.target.value)}
              placeholder="Für Teilnehmer"
            />
          </div>

          <div className="form-row">
            <label className="form-label">Trainernotizen</label>
            <textarea
              className="form-input"
              rows={3}
              value={formData.trainer_notes}
              onChange={(e) => updateFormField('trainer_notes', e.target.value)}
            />
          </div>

          <div style={{ display: 'flex', gap: '0.5rem', marginTop: '1.5rem' }}>
            <button type="submit" className="btn btn-primary" style={{ flex: 1 }}>
              {editingUnit ? 'Speichern' : 'Erstellen'}
            </button>
            <button type="button" className="btn btn-secondary" onClick={onCancel}>
              Abbrechen
            </button>
          </div>
        </form>
      </div>
    </div>
  )
}