package database

// CalendarMigrations creates the three calendar tables for Phase 9a:
//
//	cal_public_event   — read-only snapshot of school holidays + public
//	                     holidays from OpenHolidaysAPI. Imported on first
//	                     boot via seed/calendar_holidays.json.
//	cal_school_config  — per-Rektor bundesland selection (1 row per user).
//	cal_school_event   — user-managed school events (Fortbildung,
//	                     Schulfeier, Klassenfahrt etc.).
//
// cal_public_event is global (no created_by_user_id) because the data is the
// same for every school in a given bundesland. School-events are
// per-tenant.
func CalendarMigrations() []string {
	return []string{
		`CREATE TABLE IF NOT EXISTS cal_public_event (
			id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
			region VARCHAR(8) NOT NULL,
			event_type VARCHAR(20) NOT NULL CHECK (event_type IN ('public_holiday', 'school_holiday')),
			name_de VARCHAR(255) NOT NULL,
			name_en VARCHAR(255),
			start_date DATE NOT NULL,
			end_date DATE NOT NULL,
			source VARCHAR(50) DEFAULT 'OpenHolidaysAPI',
			created_at TIMESTAMPTZ DEFAULT NOW(),
			UNIQUE(region, event_type, name_de, start_date),
			CHECK (end_date >= start_date)
		)`,

		`CREATE TABLE IF NOT EXISTS cal_school_config (
			user_id UUID PRIMARY KEY,
			bundesland VARCHAR(8) NOT NULL,
			school_year_start DATE,
			school_year_end DATE,
			created_at TIMESTAMPTZ DEFAULT NOW(),
			updated_at TIMESTAMPTZ DEFAULT NOW()
		)`,

		`CREATE TABLE IF NOT EXISTS cal_school_event (
			id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
			created_by_user_id UUID NOT NULL,
			title VARCHAR(255) NOT NULL,
			description TEXT,
			event_type VARCHAR(30) NOT NULL
				CHECK (event_type IN ('fortbildung','schulfeier','klassenfahrt','projekttag','eltern_info','andere')),
			is_school_free BOOLEAN DEFAULT false,
			start_date DATE NOT NULL,
			end_date DATE NOT NULL,
			start_time TIME,
			end_time TIME,
			affected_class_ids UUID[] DEFAULT '{}',
			visible_to_parents BOOLEAN DEFAULT true,
			notify_parents BOOLEAN DEFAULT false,
			notify_students BOOLEAN DEFAULT false,
			notification_lead_days INT[] DEFAULT '{7,1}',
			created_at TIMESTAMPTZ DEFAULT NOW(),
			updated_at TIMESTAMPTZ DEFAULT NOW(),
			CHECK (end_date >= start_date)
		)`,

		// Indexes — public events are queried by region + date range. School
		// events are queried by owner + date range.
		`CREATE INDEX IF NOT EXISTS idx_cal_public_event_region_date
		   ON cal_public_event(region, start_date, end_date)`,
		`CREATE INDEX IF NOT EXISTS idx_cal_school_event_user_date
		   ON cal_school_event(created_by_user_id, start_date, end_date)`,
	}
}