-- Warehouse Module Roles & Worker-Manager Binding Migration
-- This migration adds:
-- 1. Two new warehouse roles (warehouse_manager, warehouse_worker)
-- 2. Worker-manager binding table for hierarchical access control

-- ============================================================
-- 1. Insert new warehouse roles
-- ============================================================

-- Note: These roles should be inserted if they don't exist
-- This is typically handled by the Python init script, but this 
-- SQL is provided for reference or manual database setup

INSERT IGNORE INTO roles (name, description, level) VALUES
('warehouse_manager', 'Manager - Warehouse - Full warehouse module access', 75),
('warehouse_worker', 'Worker - Warehouse - Input-only warehouse access', 35);

-- Verify insertion
SELECT id, name, level FROM roles WHERE name LIKE 'warehouse_%' ORDER BY level DESC;

-- ============================================================
-- 2. Create worker_manager_bindings table
-- ============================================================

CREATE TABLE IF NOT EXISTS worker_manager_bindings (
    id INT AUTO_INCREMENT PRIMARY KEY,
    manager_id INT NOT NULL,
    worker_id INT NOT NULL,
    warehouse_zone VARCHAR(100),
    is_active TINYINT(1) DEFAULT 1,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY unique_binding (manager_id, worker_id),
    FOREIGN KEY (manager_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (worker_id) REFERENCES users(id) ON DELETE CASCADE,
    CHECK (manager_id != worker_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ============================================================
-- 3. Example queries for worker-manager binding management
-- ============================================================

-- Assign a worker to a manager
-- INSERT INTO worker_manager_bindings (manager_id, worker_id, warehouse_zone)
-- VALUES (5, 12, NULL);  -- Manager ID 5 oversees Worker ID 12

-- Get all workers for a specific manager
-- SELECT u.id, u.username, u.full_name, wmb.warehouse_zone
-- FROM worker_manager_bindings wmb
-- JOIN users u ON wmb.worker_id = u.id
-- WHERE wmb.manager_id = 5 AND wmb.is_active = 1
-- ORDER BY u.full_name;

-- Get manager for a specific worker
-- SELECT m.id, m.username, m.full_name
-- FROM worker_manager_bindings wmb
-- JOIN users m ON wmb.manager_id = m.id
-- WHERE wmb.worker_id = 12 AND wmb.is_active = 1;

-- Deactivate a binding (soft delete)
-- UPDATE worker_manager_bindings SET is_active = 0 WHERE id = 1;

-- ============================================================
-- 4. Verification Queries
-- ============================================================

-- Verify warehouse roles exist
-- SELECT COUNT(*) as warehouse_role_count FROM roles WHERE name LIKE 'warehouse_%';

-- Verify worker_manager_bindings table exists
-- SELECT TABLE_NAME FROM information_schema.TABLES 
-- WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'worker_manager_bindings';

-- List all role hierarchy (for reference)
-- SELECT name, level, CASE 
--     WHEN level >= 90 THEN 'Admin'
--     WHEN level >= 70 THEN 'Manager'
--     WHEN level >= 35 THEN 'Worker'
--     ELSE 'Unknown'
-- END as category FROM roles ORDER BY level DESC;