-- Migration 054: Trainingsmodule (Bibliothek / Planung) — Phase 1 MVP
-- Fachgrundlage: functional/Shinkan Trainingsmodule Kombinationsuebungen Spezifikation V2.md

CREATE TABLE IF NOT EXISTS training_modules (
    id SERIAL PRIMARY KEY,
    club_id INT REFERENCES clubs(id) ON DELETE SET NULL,
    created_by INT REFERENCES profiles(id) ON DELETE SET NULL,
    title VARCHAR(200) NOT NULL,
    summary TEXT,
    goal TEXT,
    recommended_duration_min INT,
    target_group_notes TEXT,
    deployment_context_notes TEXT,
    primary_method_id INT REFERENCES training_methods(id) ON DELETE SET NULL,
    visibility VARCHAR(50) NOT NULL DEFAULT 'club'
        CHECK (visibility IN ('private', 'club', 'official')),
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_training_modules_club ON training_modules(club_id);
CREATE INDEX IF NOT EXISTS idx_training_modules_creator ON training_modules(created_by);
CREATE INDEX IF NOT EXISTS idx_training_modules_visibility ON training_modules(visibility);
CREATE INDEX IF NOT EXISTS idx_training_modules_method ON training_modules(primary_method_id)
    WHERE primary_method_id IS NOT NULL;

DROP TRIGGER IF EXISTS training_modules_update ON training_modules;
CREATE TRIGGER training_modules_update
    BEFORE UPDATE ON training_modules
    FOR EACH ROW EXECUTE FUNCTION update_timestamp();

CREATE TABLE IF NOT EXISTS training_module_items (
    id SERIAL PRIMARY KEY,
    module_id INT NOT NULL REFERENCES training_modules(id) ON DELETE CASCADE,
    order_index INT NOT NULL,
    item_type VARCHAR(20) NOT NULL CHECK (item_type IN ('exercise', 'note')),
    exercise_id INT REFERENCES exercises(id) ON DELETE SET NULL,
    exercise_variant_id INT REFERENCES exercise_variants(id) ON DELETE SET NULL,
    planned_duration_min INT,
    notes TEXT,
    note_body TEXT,
    UNIQUE (module_id, order_index),
    CHECK (
        (item_type = 'exercise' AND exercise_id IS NOT NULL AND note_body IS NULL)
        OR
        (item_type = 'note' AND exercise_id IS NULL)
    )
);

CREATE INDEX IF NOT EXISTS idx_training_module_items_module ON training_module_items(module_id);
CREATE INDEX IF NOT EXISTS idx_training_module_items_exercise ON training_module_items(exercise_id)
    WHERE exercise_id IS NOT NULL;

-- Herkunft bei Übernahme aus Modul-Bibliothek (Kopie, keine Live-Verknüpfung)
ALTER TABLE training_unit_section_items
    ADD COLUMN IF NOT EXISTS source_training_module_id INT REFERENCES training_modules(id) ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS idx_training_unit_section_items_source_module
    ON training_unit_section_items(source_training_module_id)
    WHERE source_training_module_id IS NOT NULL;