/**
 * Planungs-KI Phase D: strukturierter Kontext für suggestExerciseAi.
 */

export function buildPickerPlanningContextForAi({
  planningContextSummary = null,
  planningContext = null,
  searchQuery = '',
} = {}) {
  if (!planningContextSummary && !planningContext) return null
  const ctx = {
    source: 'planning_picker',
    search_query: (searchQuery || '').trim() || null,
    unit_title: planningContextSummary?.unit_title || null,
    group_name: planningContextSummary?.group_name || null,
    section_title:
      planningContextSummary?.section_title || planningContext?.sectionTitle || null,
    section_guidance_notes: planningContext?.sectionGuidanceNotes || null,
    section_exercise_count: planningContextSummary?.section_exercise_count ?? null,
    last_section_exercise_title:
      planningContextSummary?.last_section_exercise_title ||
      planningContext?.lastExerciseTitle ||
      null,
    anchor_title: planningContextSummary?.anchor_title || null,
    progression_graph_name: planningContextSummary?.progression_graph_name || null,
    planned_count: planningContextSummary?.planned_count ?? null,
    intent_resolved:
      planningContextSummary?.intent_resolved || planningContext?.intentHint || null,
  }
  return Object.fromEntries(Object.entries(ctx).filter(([, v]) => v != null && v !== ''))
}

export function buildPathGapPlanningContextForAi({
  goalQuery = '',
  semanticBrief = null,
  offer = null,
  graphId = null,
  pathSteps = [],
  editableMajorSteps = [],
  progressionRoadmap = null,
} = {}) {
  const afterIdx = Number(offer?.insert_after_index)
  const stepA = Number.isFinite(afterIdx) && afterIdx >= 0 ? pathSteps[afterIdx] : null
  const stepB =
    Number.isFinite(afterIdx) && afterIdx >= 0 ? pathSteps[afterIdx + 1] : null
  const majorIdxRaw =
    offer?.roadmap_major_step_index ?? offer?.gap?.roadmap_major_step_index
  const majorIdx =
    majorIdxRaw != null && Number.isFinite(Number(majorIdxRaw)) ? Number(majorIdxRaw) : null
  const majorStep =
    majorIdx != null && editableMajorSteps[majorIdx] ? editableMajorSteps[majorIdx] : null

  const ctx = {
    source: 'progression_path_gap_fill',
    goal_query: (goalQuery || '').trim() || null,
    primary_topic: semanticBrief?.primary_topic || null,
    progression_graph_id: graphId != null ? Number(graphId) : null,
    gap_source: offer?.source || null,
    gap_phase: offer?.phase || offer?.gap?.expected_phase || null,
    roadmap_major_step_index: majorIdx,
    roadmap_phase: majorStep?.phase || offer?.phase || null,
    roadmap_learning_goal:
      (majorStep?.learning_goal || offer?.title_hint || offer?.gap?.learning_goal || '').trim() ||
      null,
    neighbor_before_title: stepA?.exerciseTitle || offer?.from_title || null,
    neighbor_after_title: stepB?.exerciseTitle || offer?.to_title || null,
    path_step_count: Array.isArray(pathSteps) ? pathSteps.length : 0,
    major_step_count:
      editableMajorSteps?.length ||
      progressionRoadmap?.major_step_count ||
      progressionRoadmap?.roadmap?.major_steps?.length ||
      null,
  }
  return Object.fromEntries(Object.entries(ctx).filter(([, v]) => v != null && v !== ''))
}