-- ============================================================================
-- Migration: Drop Legacy Tables
--
-- This script removes unused legacy tables after data migration to unified
-- tables (machinerelationships, communications).
--
-- Tables to drop:
--   - machineoverrides (empty, functionality not used)
--   - dualpathassignments (migrated to machinerelationships)
--   - networkinterfaces (migrated to communications)
--   - _backup_equipment_ips_phase1_5 (old migration backup)
--
-- IMPORTANT: Run this on DEV first and test thoroughly before production!
-- ============================================================================

-- ============================================================================
-- STEP 1: Drop views that reference legacy tables
-- ============================================================================

DROP VIEW IF EXISTS vw_shopfloor_pcs;

-- ============================================================================
-- STEP 2: Drop FK constraints on legacy tables
-- ============================================================================

ALTER TABLE dualpathassignments DROP FOREIGN KEY fk_dualpathassignments_machines;
ALTER TABLE machineoverrides DROP FOREIGN KEY fk_machineoverrides_machines;
ALTER TABLE networkinterfaces DROP FOREIGN KEY fk_networkinterfaces_machines;

-- ============================================================================
-- STEP 3: Drop the legacy tables
-- ============================================================================

DROP TABLE IF EXISTS machineoverrides;
DROP TABLE IF EXISTS dualpathassignments;
DROP TABLE IF EXISTS networkinterfaces;
DROP TABLE IF EXISTS _backup_equipment_ips_phase1_5;

-- ============================================================================
-- STEP 4: Recreate vw_shopfloor_pcs without machineoverrides reference
-- ============================================================================

CREATE VIEW vw_shopfloor_pcs AS
SELECT
    m.machineid,
    m.hostname,
    m.serialnumber,
    v.vendor AS manufacturer,
    md.modelnumber AS model,
    m.loggedinuser,
    m.machinenumber,
    COALESCE(os.operatingsystem, 'Unknown') AS operatingsystem,
    m.lastupdated,
    m.lastboottime,
    DATEDIFF(NOW(), m.lastboottime) AS uptime_days
FROM machines m
JOIN pctype pt ON m.pctypeid = pt.pctypeid
LEFT JOIN models md ON m.modelnumberid = md.modelnumberid
LEFT JOIN vendors v ON md.vendorid = v.vendorid
LEFT JOIN operatingsystems os ON m.osid = os.osid
WHERE pt.typename = 'Shopfloor'
AND m.lastupdated > DATE_SUB(NOW(), INTERVAL 30 DAY)
AND m.pctypeid IS NOT NULL
ORDER BY m.machinenumber, m.hostname;

-- ============================================================================
-- STEP 5: Verify
-- ============================================================================

-- Should NOT show dropped tables
SELECT 'Verifying tables are dropped:' AS status;
SHOW TABLES LIKE 'machineoverrides';
SHOW TABLES LIKE 'dualpathassignments';
SHOW TABLES LIKE 'networkinterfaces';
SHOW TABLES LIKE '_backup%';

-- Verify view works
SELECT 'Testing vw_shopfloor_pcs:' AS status;
SELECT COUNT(*) AS shopfloor_pc_count FROM vw_shopfloor_pcs;

SELECT 'Migration complete! Legacy tables have been dropped.' AS status;