-- Migration 014: Variant Progression System + Search Vector + Legacy Cleanup
-- Autor: Claude Code
-- Datum: 2026-04-24
-- Zweck: Varianten-Progression, Volltext-Suche, Legacy-Spalten entfernen

DO $$
BEGIN

-- ============================================================================
-- HELPER FUNCTION: update_timestamp (für Triggers)
-- ============================================================================

CREATE OR REPLACE FUNCTION update_timestamp()
RETURNS trigger AS $func$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$func$ LANGUAGE plpgsql;

-- ============================================================================
-- VARIANT PROGRESSION
-- ============================================================================

-- Erweitere exercise_variants Tabelle
ALTER TABLE exercise_variants
ADD COLUMN IF NOT EXISTS progression_level INT DEFAULT 1 CHECK (progression_level BETWEEN 1 AND 10),
ADD COLUMN IF NOT EXISTS sequence_order INT,
ADD COLUMN IF NOT EXISTS prerequisite_variant_id INT REFERENCES exercise_variants(id) ON DELETE SET NULL;

-- Index für Prerequisites
CREATE INDEX IF NOT EXISTS idx_exercise_variants_prerequisite
ON exercise_variants(prerequisite_variant_id);

-- ============================================================================
-- SEARCH VECTOR (Volltext-Suche)
-- ============================================================================

-- Füge search_vector zu exercises hinzu
ALTER TABLE exercises
ADD COLUMN IF NOT EXISTS search_vector tsvector;

-- Index für Volltext-Suche
CREATE INDEX IF NOT EXISTS idx_exercises_search
ON exercises USING gin(search_vector);

-- Funktion für automatisches Update
CREATE OR REPLACE FUNCTION update_exercises_search_vector()
RETURNS trigger AS $func$
BEGIN
    NEW.search_vector :=
        setweight(to_tsvector('german', COALESCE(NEW.title, '')), 'A') ||
        setweight(to_tsvector('german', COALESCE(NEW.summary, '')), 'B') ||
        setweight(to_tsvector('german', COALESCE(NEW.execution, '')), 'C') ||
        setweight(to_tsvector('german', COALESCE(NEW.trainer_notes, '')), 'D');
    RETURN NEW;
END;
$func$ LANGUAGE plpgsql;

-- Trigger
DROP TRIGGER IF EXISTS exercises_search_update ON exercises;
CREATE TRIGGER exercises_search_update
BEFORE INSERT OR UPDATE ON exercises
FOR EACH ROW EXECUTE FUNCTION update_exercises_search_vector();

-- Initiales Befüllen (für existierende Zeilen)
UPDATE exercises SET search_vector = (
    setweight(to_tsvector('german', COALESCE(title, '')), 'A') ||
    setweight(to_tsvector('german', COALESCE(summary, '')), 'B') ||
    setweight(to_tsvector('german', COALESCE(execution, '')), 'C') ||
    setweight(to_tsvector('german', COALESCE(trainer_notes, '')), 'D')
) WHERE search_vector IS NULL;

-- ============================================================================
-- LEGACY COLUMN CLEANUP
-- Deprecated Felder aus exercises (ersetzt durch M:N Tabellen in Migration 008+)
-- ============================================================================

-- age_groups JSONB → ersetzt durch exercise_age_groups M:N (seit Migration 008)
ALTER TABLE exercises DROP COLUMN IF EXISTS age_groups;

-- focus_area VARCHAR → ersetzt durch exercise_focus_areas M:N (seit Migration 008)
ALTER TABLE exercises DROP COLUMN IF EXISTS focus_area;

-- secondary_areas JSONB → ersetzt durch exercise_focus_areas M:N
ALTER TABLE exercises DROP COLUMN IF EXISTS secondary_areas;

-- training_character VARCHAR → ersetzt durch exercise_training_characters M:N (seit Migration 012)
ALTER TABLE exercises DROP COLUMN IF EXISTS training_character;

-- ============================================================================
-- ADDITIONAL INDEXES (Performance)
-- ============================================================================

-- Häufige Filter
CREATE INDEX IF NOT EXISTS idx_exercises_visibility ON exercises(visibility);
CREATE INDEX IF NOT EXISTS idx_exercises_status ON exercises(status);
CREATE INDEX IF NOT EXISTS idx_exercises_created_at ON exercises(created_at DESC);

-- M:N Relations (falls noch nicht vorhanden)
CREATE INDEX IF NOT EXISTS idx_exercise_focus_areas_focus
ON exercise_focus_areas(focus_area_id);

CREATE INDEX IF NOT EXISTS idx_exercise_styles_style
ON exercise_style_directions(style_direction_id);

CREATE INDEX IF NOT EXISTS idx_exercise_target_groups_group
ON exercise_target_groups(target_group_id);

CREATE INDEX IF NOT EXISTS idx_exercise_skills_skill
ON exercise_skills(skill_id);

RAISE NOTICE 'Migration 014 completed successfully';

END $$;
