-- Migration 1042: Per-user visibility preferences for case modules.
-- Existing sag_module_prefs remain case-wide for backwards compatibility.
-- New per-user preferences are initially used for the Buzzwords module only.

CREATE TABLE IF NOT EXISTS user_sag_module_prefs (
    id SERIAL PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(user_id) ON DELETE CASCADE,
    sag_id INTEGER NOT NULL REFERENCES sag_sager(id) ON DELETE CASCADE,
    module_key VARCHAR(50) NOT NULL,
    is_enabled BOOLEAN NOT NULL DEFAULT TRUE,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE (user_id, sag_id, module_key)
);

CREATE INDEX IF NOT EXISTS idx_user_sag_module_prefs_user_sag
    ON user_sag_module_prefs(user_id, sag_id);

CREATE OR REPLACE FUNCTION update_user_sag_module_prefs_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS update_user_sag_module_prefs_updated_at ON user_sag_module_prefs;
CREATE TRIGGER update_user_sag_module_prefs_updated_at
    BEFORE UPDATE ON user_sag_module_prefs
    FOR EACH ROW
    EXECUTE FUNCTION update_user_sag_module_prefs_updated_at();