-- Migration 012: Exercise Training Characters (M:N) + Trainer Contexts
-- Author: Claude Code
-- Date: 2026-04-23
-- Purpose: Add M:N relationship for training characters and trainer profile system

DO $$
BEGIN

-- ============================================================================
-- EXERCISE TRAINING CHARACTERS (M:N)
-- ============================================================================

-- Create junction table for exercise ↔ training_characters
IF NOT EXISTS (
    SELECT 1 FROM information_schema.tables
    WHERE table_schema = 'public'
    AND table_name = 'exercise_training_characters'
) THEN
    CREATE TABLE exercise_training_characters (
        id SERIAL PRIMARY KEY,
        exercise_id INT NOT NULL REFERENCES exercises(id) ON DELETE CASCADE,
        training_character_id INT NOT NULL REFERENCES training_characters(id) ON DELETE RESTRICT,
        is_primary BOOLEAN DEFAULT false,
        created_at TIMESTAMP DEFAULT NOW(),
        UNIQUE(exercise_id, training_character_id)
    );

    CREATE INDEX idx_exercise_training_characters_exercise
        ON exercise_training_characters(exercise_id);
    CREATE INDEX idx_exercise_training_characters_character
        ON exercise_training_characters(training_character_id);

    RAISE NOTICE 'Created table: exercise_training_characters';
END IF;


-- ============================================================================
-- TRAINER CONTEXTS (Fokussierte Trainer-Ansichten)
-- ============================================================================

-- Create trainer_contexts table
IF NOT EXISTS (
    SELECT 1 FROM information_schema.tables
    WHERE table_schema = 'public'
    AND table_name = 'trainer_contexts'
) THEN
    CREATE TABLE trainer_contexts (
        id SERIAL PRIMARY KEY,
        profile_id INT NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,

        -- Context definition
        name VARCHAR(100) NOT NULL, -- "Karate Goju-Ryu Breitensport", "Gewaltschutz"

        -- Hierarchical filters (all optional)
        focus_area_id INT REFERENCES focus_areas(id) ON DELETE CASCADE,
        style_direction_id INT REFERENCES style_directions(id) ON DELETE CASCADE,
        training_type_id INT REFERENCES training_types(id) ON DELETE SET NULL,

        -- Flags
        is_style_independent BOOLEAN DEFAULT false, -- true = "Leistungssport stilunabhängig"
        is_active BOOLEAN DEFAULT true,

        -- Metadata
        description TEXT,
        sort_order INT DEFAULT 99,
        created_at TIMESTAMP DEFAULT NOW(),
        updated_at TIMESTAMP DEFAULT NOW(),

        -- Prevent duplicates
        UNIQUE(profile_id, focus_area_id, style_direction_id, training_type_id)
    );

    CREATE INDEX idx_trainer_contexts_profile ON trainer_contexts(profile_id);
    CREATE INDEX idx_trainer_contexts_focus ON trainer_contexts(focus_area_id);
    CREATE INDEX idx_trainer_contexts_style ON trainer_contexts(style_direction_id);
    CREATE INDEX idx_trainer_contexts_type ON trainer_contexts(training_type_id);

    RAISE NOTICE 'Created table: trainer_contexts';
END IF;


-- ============================================================================
-- SEED DATA: Example Trainer Contexts
-- ============================================================================

-- Insert example contexts for profile_id = 1 (if exists)
DO $seed$
BEGIN
    IF EXISTS (SELECT 1 FROM profiles WHERE id = 1) THEN
        -- Only insert if not already present
        IF NOT EXISTS (SELECT 1 FROM trainer_contexts WHERE profile_id = 1) THEN
            INSERT INTO trainer_contexts (profile_id, name, focus_area_id, style_direction_id, training_type_id, is_style_independent, description, sort_order)
            VALUES
                -- Karate Breitensport (if focus_area and style exist)
                (1, 'Karate Breitensport',
                    (SELECT id FROM focus_areas WHERE name = 'Karate' LIMIT 1),
                    NULL, -- all styles
                    (SELECT id FROM training_types WHERE name = 'Breitensport' LIMIT 1),
                    false,
                    'Breitensport für alle Karate-Stilrichtungen',
                    1
                );

            RAISE NOTICE 'Inserted example trainer contexts for profile_id = 1';
        END IF;
    END IF;
END $seed$;


RAISE NOTICE 'Migration 012 completed successfully';

END $$;