-- MySQL schema for warehouse manager

CREATE TABLE IF NOT EXISTS users (
  id INT AUTO_INCREMENT PRIMARY KEY,
  username VARCHAR(64) NOT NULL UNIQUE,
  password_hash VARCHAR(255) NULL,
  name VARCHAR(128) NOT NULL,
  email VARCHAR(128) NOT NULL,
  department VARCHAR(128) DEFAULT NULL,
  position VARCHAR(128) DEFAULT NULL,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS roles (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(32) NOT NULL UNIQUE
);

CREATE TABLE IF NOT EXISTS permissions (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(32) NOT NULL UNIQUE
);

CREATE TABLE IF NOT EXISTS user_roles (
  user_id INT NOT NULL,
  role_id INT NOT NULL,
  PRIMARY KEY(user_id, role_id),
  FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE,
  FOREIGN KEY(role_id) REFERENCES roles(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS role_permissions (
  role_id INT NOT NULL,
  permission_id INT NOT NULL,
  PRIMARY KEY(role_id, permission_id),
  FOREIGN KEY(role_id) REFERENCES roles(id) ON DELETE CASCADE,
  FOREIGN KEY(permission_id) REFERENCES permissions(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS categories (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(128) NOT NULL,
  description TEXT,
  icon VARCHAR(64) DEFAULT 'fas fa-tag',
  color VARCHAR(16) DEFAULT '#2c5aa0',
  active TINYINT(1) DEFAULT 1,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS items (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(255) NOT NULL,
  category_id INT NULL,
  price DECIMAL(12,2) NOT NULL DEFAULT 0,
  quantity INT NOT NULL DEFAULT 0,
  description TEXT,
  barcode VARCHAR(128),
  min_quantity INT NOT NULL DEFAULT 0,
  location VARCHAR(255),
  supplier VARCHAR(255),
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  FOREIGN KEY(category_id) REFERENCES categories(id) ON DELETE SET NULL
);

CREATE TABLE IF NOT EXISTS operations (
  id INT AUTO_INCREMENT PRIMARY KEY,
  type ENUM('incoming','outgoing') NOT NULL,
  item_id INT NOT NULL,
  quantity INT NOT NULL,
  employee_id INT NOT NULL,
  status ENUM('completed','pending','cancelled') DEFAULT 'completed',
  notes TEXT,
  supplier VARCHAR(255),
  recipient VARCHAR(255),
  date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY(item_id) REFERENCES items(id) ON DELETE CASCADE,
  FOREIGN KEY(employee_id) REFERENCES users(id) ON DELETE RESTRICT
);