-- Migration 024: Reifegradmodelle / Fähigkeitsmatrix (kontextbezogen)
-- Datum: 2026-04-27

-- ============================================================================
-- MATURITY MODELS
-- ============================================================================

CREATE TABLE IF NOT EXISTS maturity_models (
    id SERIAL PRIMARY KEY,
    name VARCHAR(200) NOT NULL,
    description TEXT,

    focus_area_id       INT REFERENCES focus_areas(id)       ON DELETE RESTRICT,
    style_direction_id  INT REFERENCES style_directions(id)  ON DELETE RESTRICT,
    target_group_id     INT REFERENCES target_groups(id)     ON DELETE RESTRICT,

    level_count INT NOT NULL DEFAULT 5 CHECK (level_count BETWEEN 3 AND 10),

    status VARCHAR(20) DEFAULT 'draft' CHECK (status IN ('draft', 'active', 'archived')),

    version VARCHAR(20) DEFAULT '1.0',

    created_by  INT REFERENCES profiles(id) ON DELETE SET NULL,
    club_id     INT REFERENCES clubs(id)    ON DELETE SET NULL,

    import_source VARCHAR(50),
    import_id     VARCHAR(200),

    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),

    CONSTRAINT maturity_models_context_name_unique
        UNIQUE (name, focus_area_id, style_direction_id, target_group_id)
);

-- ============================================================================
-- MODEL LEVELS (Stufen-Labels pro Modell)
-- ============================================================================

CREATE TABLE IF NOT EXISTS model_levels (
    id SERIAL PRIMARY KEY,
    maturity_model_id INT NOT NULL REFERENCES maturity_models(id) ON DELETE CASCADE,
    level_number      INT NOT NULL CHECK (level_number >= 1),
    name              VARCHAR(100) NOT NULL,
    description       TEXT,
    sort_order        INT NOT NULL,

    created_at TIMESTAMP DEFAULT NOW(),

    UNIQUE(maturity_model_id, level_number)
);

-- ============================================================================
-- MODEL SKILLS: Welche Fähigkeiten sind im Modell geführt (Matrix-Zeilen)
-- ============================================================================

CREATE TABLE IF NOT EXISTS model_skills (
    id SERIAL PRIMARY KEY,
    maturity_model_id INT NOT NULL REFERENCES maturity_models(id) ON DELETE CASCADE,
    skill_id          INT NOT NULL REFERENCES skills(id) ON DELETE CASCADE,
    sort_order        INT NOT NULL DEFAULT 0,
    relevance         VARCHAR(50),

    created_at TIMESTAMP DEFAULT NOW(),

    UNIQUE(maturity_model_id, skill_id)
);

CREATE INDEX IF NOT EXISTS idx_model_skills_model ON model_skills(maturity_model_id);
CREATE INDEX IF NOT EXISTS idx_model_skills_skill ON model_skills(skill_id);

-- ============================================================================
-- MODEL SKILL LEVELS (Zelltexte der Matrix)
-- ============================================================================

CREATE TABLE IF NOT EXISTS model_skill_levels (
    id SERIAL PRIMARY KEY,
    maturity_model_id INT NOT NULL REFERENCES maturity_models(id) ON DELETE CASCADE,
    skill_id          INT NOT NULL REFERENCES skills(id) ON DELETE CASCADE,
    level_number      INT NOT NULL CHECK (level_number >= 1),

    description TEXT NOT NULL,
    observable_criteria TEXT,
    example_exercise_hints JSONB,

    ai_generated BOOLEAN DEFAULT false,

    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),

    UNIQUE(maturity_model_id, skill_id, level_number)
);

-- ============================================================================
-- SKILLS: optionale Matrix-Felder (Spec)
-- ============================================================================

ALTER TABLE skills
    ADD COLUMN IF NOT EXISTS primary_focus_area_id INT REFERENCES focus_areas(id) ON DELETE SET NULL;

ALTER TABLE skills
    ADD COLUMN IF NOT EXISTS is_cross_domain BOOLEAN DEFAULT false;

-- ============================================================================
-- INDEXES
-- ============================================================================

CREATE INDEX IF NOT EXISTS idx_maturity_models_focus    ON maturity_models(focus_area_id);
CREATE INDEX IF NOT EXISTS idx_maturity_models_style    ON maturity_models(style_direction_id);
CREATE INDEX IF NOT EXISTS idx_maturity_models_target   ON maturity_models(target_group_id);
CREATE INDEX IF NOT EXISTS idx_maturity_models_status   ON maturity_models(status);

CREATE INDEX IF NOT EXISTS idx_model_levels_model       ON model_levels(maturity_model_id);

CREATE INDEX IF NOT EXISTS idx_model_skill_levels_model ON model_skill_levels(maturity_model_id);
CREATE INDEX IF NOT EXISTS idx_model_skill_levels_skill ON model_skill_levels(skill_id);

CREATE INDEX IF NOT EXISTS idx_skills_primary_focus     ON skills(primary_focus_area_id);

-- ============================================================================
-- TRIGGERS updated_at
-- ============================================================================

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

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