/**
 * Voller Katalog-Inhalt einer Übung (Lesemodus für Coach/Mobile).
 * Optional: geplante Variante (`variantId`) — Beschreibung und Durchführungsänderungen oben.
 */
import React from 'react'
import { Link } from 'react-router-dom'
import ExerciseRichTextBlock from './ExerciseRichTextBlock'

function TagRow({ exercise }) {
  const tags = []
  ;(exercise.focus_areas || []).forEach((f) => {
    tags.push({ key: `fa-${f.id}`, label: f.name, accent: !!f.is_primary })
  })
  ;(exercise.training_styles || []).forEach((t) => {
    tags.push({ key: `ts-${t.id}`, label: t.name, accent: false })
  })
  ;(exercise.training_types || []).forEach((t) => {
    tags.push({ key: `tt-${t.id}`, label: t.name, accent: false })
  })
  ;(exercise.target_groups || []).forEach((g) => {
    tags.push({ key: `tg-${g.id}`, label: g.name, accent: !!g.is_primary })
  })
  if (tags.length === 0) return null
  return (
    <div className="exercise-tag-row">
      {tags.map((t) => (
        <span key={t.key} className={`exercise-tag${t.accent ? ' exercise-tag--accent' : ''}`}>
          {t.label}
        </span>
      ))}
    </div>
  )
}

function metaParts(exercise) {
  const parts = []
  if (exercise.duration_min != null || exercise.duration_max != null) {
    const a = exercise.duration_min
    const b = exercise.duration_max
    if (a != null && b != null && a !== b) parts.push(`${a}–${b} Min.`)
    else if (a != null) parts.push(`ca. ${a} Min.`)
    else if (b != null) parts.push(`ca. ${b} Min.`)
  }
  if (exercise.group_size_min != null || exercise.group_size_max != null) {
    const a = exercise.group_size_min
    const b = exercise.group_size_max
    if (a != null && b != null && a !== b) parts.push(`Gruppe ${a}–${b}`)
    else if (a != null) parts.push(`Gruppe ab ${a}`)
    else if (b != null) parts.push(`Gruppe bis ${b}`)
  }
  return parts
}

/**
 * @param {{ exercise?: object|null, loading?: boolean, error?: string|null, exerciseId?: number, variantId?: number|string|null }} props
 */
export default function ExerciseFullContent({ exercise, loading, error, exerciseId, variantId }) {
  if (loading) {
    return (
      <div style={{ textAlign: 'center', padding: '1rem' }}>
        <div className="spinner" />
        <p style={{ marginTop: '10px', color: 'var(--text2)', fontSize: '0.9rem' }}>Übung aus Katalog laden…</p>
      </div>
    )
  }
  if (error) {
    return <p style={{ color: 'var(--danger)', fontSize: '0.92rem', padding: '4px 0' }}>{error}</p>
  }
  if (!exercise) return null

  const resolvedId = exercise.id ?? exerciseId
  const meta = metaParts(exercise)

  const variant =
    variantId != null && variantId !== '' && Array.isArray(exercise.variants) && exercise.variants.length
      ? exercise.variants.find((v) => String(v.id) === String(variantId)) || null
      : null

  return (
    <div className="exercise-coach-catalog" style={{ fontSize: '0.93rem', lineHeight: 1.5 }}>
      {variant ? (
        <section
          className="card"
          style={{
            marginBottom: '14px',
            padding: '12px 14px',
            borderLeft: '3px solid var(--accent)',
            background: 'var(--surface2)',
          }}
        >
          <h3 style={{ fontSize: '0.72rem', textTransform: 'uppercase', color: 'var(--text3)', margin: '0 0 6px', letterSpacing: '0.04em' }}>
            Geplante Variante
          </h3>
          <p style={{ margin: '0 0 10px', fontSize: '1.05rem', fontWeight: 700 }}>{variant.variant_name || `Variante #${variant.id}`}</p>
          {variant.description ? (
            <div style={{ marginBottom: variant.execution_changes ? '12px' : 0 }}>
              <h4 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>Zur Variante</h4>
              <ExerciseRichTextBlock html={variant.description} exerciseId={resolvedId} media={exercise.media} />
            </div>
          ) : null}
          {variant.execution_changes ? (
            <div>
              <h4 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>Durchführung (Variante)</h4>
              <ExerciseRichTextBlock html={variant.execution_changes} exerciseId={resolvedId} media={exercise.media} />
            </div>
          ) : null}
        </section>
      ) : null}
      <h2 style={{ margin: '0 0 8px', fontSize: '1.2rem', lineHeight: 1.35 }}>{exercise.title}</h2>
      {meta.length > 0 && (
        <p className="exercise-meta-line" style={{ marginBottom: '10px', color: 'var(--text3)', fontSize: '0.86rem' }}>
          {meta.join(' · ')}
        </p>
      )}
      <TagRow exercise={exercise} />
      {exercise.summary && (
        <section className="card" style={{ marginTop: '12px', padding: '12px 14px' }}>
          <h3 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px', letterSpacing: '0.04em' }}>
            Kurzbeschreibung
          </h3>
          <ExerciseRichTextBlock html={exercise.summary} exerciseId={resolvedId} media={exercise.media} />
        </section>
      )}
      {exercise.goal && (
        <section className="card" style={{ marginTop: '10px', padding: '12px 14px' }}>
          <h3 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>Ziel</h3>
          <ExerciseRichTextBlock html={exercise.goal} exerciseId={resolvedId} media={exercise.media} />
        </section>
      )}
      {(exercise.equipment || []).length > 0 && (
        <section className="card" style={{ marginTop: '10px', padding: '12px 14px' }}>
          <h3 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>
            Material &amp; Aufbau
          </h3>
          <ul style={{ paddingLeft: '1.1rem', margin: 0 }}>
            {exercise.equipment.map((x, i) => (
              <li key={i}>{x}</li>
            ))}
          </ul>
        </section>
      )}
      {exercise.preparation && (
        <section className="card" style={{ marginTop: '10px', padding: '12px 14px' }}>
          <h3 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>Vorbereitung</h3>
          <ExerciseRichTextBlock html={exercise.preparation} exerciseId={resolvedId} media={exercise.media} />
        </section>
      )}
      {exercise.execution && (
        <section className="card" style={{ marginTop: '10px', padding: '12px 14px' }}>
          <h3 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>Ablauf</h3>
          <ExerciseRichTextBlock html={exercise.execution} exerciseId={resolvedId} media={exercise.media} />
        </section>
      )}
      {exercise.trainer_notes && (
        <section className="card" style={{ marginTop: '10px', padding: '12px 14px' }}>
          <h3 style={{ fontSize: '0.78rem', textTransform: 'uppercase', color: 'var(--text3)', marginBottom: '8px' }}>
            Hinweise Trainer (Katalog)
          </h3>
          <ExerciseRichTextBlock html={exercise.trainer_notes} exerciseId={resolvedId} media={exercise.media} />
        </section>
      )}
      {exerciseId != null && (
        <p style={{ marginTop: '12px' }}>
          <Link to={`/exercises/${exerciseId}`} style={{ fontSize: '0.86rem', color: 'var(--accent)' }}>
            Volle Übungsseite im Browser
          </Link>
        </p>
      )}
    </div>
  )
}