-- Produktkatalog, Bestellungen (mit unveränderlichem Preis-Snapshot) und Verträge
CREATE TABLE number_sequences (name VARCHAR(30) PRIMARY KEY, next_value INT NOT NULL);
INSERT INTO number_sequences VALUES ('order', 20000), ('contract', 30000);

CREATE TABLE tax_rates (
  id CHAR(36) PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  rate_bp INT NOT NULL,
  active TINYINT(1) NOT NULL DEFAULT 1,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3)
);
INSERT INTO tax_rates (id, name, rate_bp) VALUES (UUID(), 'Regelsteuersatz 19 %', 1900), (UUID(), 'Ermäßigter Steuersatz 7 %', 700), (UUID(), 'Steuerfrei 0 %', 0);

CREATE TABLE products (
  id CHAR(36) PRIMARY KEY,
  sku VARCHAR(50) NOT NULL UNIQUE,
  category ENUM('hosting','license','addon','service') NOT NULL,
  status ENUM('draft','active','retired') NOT NULL DEFAULT 'draft',
  connector_instance_id CHAR(36) NULL,
  orderable_by_customer TINYINT(1) NOT NULL DEFAULT 0,
  requires_approval TINYINT(1) NOT NULL DEFAULT 1,
  customer_actions JSON NOT NULL DEFAULT '[]',
  current_version_id CHAR(36) NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  FOREIGN KEY (connector_instance_id) REFERENCES connector_instances(id) ON DELETE SET NULL
);
-- Versionen sind unveränderlich; jede Preis-/Vertragsänderung erzeugt eine neue Version.
CREATE TABLE product_versions (
  id CHAR(36) PRIMARY KEY,
  product_id CHAR(36) NOT NULL,
  version INT NOT NULL,
  name VARCHAR(200) NOT NULL,
  description TEXT NULL,
  tax_rate_id CHAR(36) NOT NULL,
  tax_bp INT NOT NULL,
  setup_net_cents INT NOT NULL DEFAULT 0,
  recurring_net_cents INT NOT NULL DEFAULT 0,
  currency CHAR(3) NOT NULL DEFAULT 'EUR',
  billing_interval ENUM('once','monthly','yearly') NOT NULL,
  term_months INT NOT NULL DEFAULT 0,
  renewal ENUM('auto','none') NOT NULL DEFAULT 'none',
  renewal_term_months INT NOT NULL DEFAULT 0,
  notice_days INT NOT NULL DEFAULT 30,
  provisioning_json JSON NOT NULL DEFAULT '{}',
  created_by CHAR(36) NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  UNIQUE KEY uq_product_version (product_id, version),
  FOREIGN KEY (product_id) REFERENCES products(id) ON DELETE CASCADE,
  FOREIGN KEY (tax_rate_id) REFERENCES tax_rates(id)
);

CREATE TABLE orders (
  id CHAR(36) PRIMARY KEY,
  number VARCHAR(20) NOT NULL UNIQUE,
  org_id CHAR(36) NOT NULL,
  status ENUM('pending_approval','approved','provisioning','completed','failed','rejected','cancelled') NOT NULL,
  placed_by CHAR(36) NULL,
  placed_via ENUM('customer','staff') NOT NULL,
  approval_required TINYINT(1) NOT NULL DEFAULT 1,
  approved_by CHAR(36) NULL,
  approved_at DATETIME(3) NULL,
  note VARCHAR(500) NULL,
  failure_note VARCHAR(500) NULL,
  failure_ambiguous TINYINT(1) NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  INDEX (org_id), INDEX (status),
  FOREIGN KEY (org_id) REFERENCES organizations(id)
);
CREATE TABLE order_items (
  id CHAR(36) PRIMARY KEY,
  order_id CHAR(36) NOT NULL,
  product_version_id CHAR(36) NOT NULL,
  quantity INT NOT NULL DEFAULT 1,
  discount_bp INT NOT NULL DEFAULT 0,
  snapshot_json JSON NOT NULL,
  FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE,
  FOREIGN KEY (product_version_id) REFERENCES product_versions(id)
);
CREATE TABLE contracts (
  id CHAR(36) PRIMARY KEY,
  number VARCHAR(20) NOT NULL UNIQUE,
  org_id CHAR(36) NOT NULL,
  order_item_id CHAR(36) NOT NULL UNIQUE,
  product_version_id CHAR(36) NOT NULL,
  status ENUM('pending','active','suspended','cancelled','expired','failed') NOT NULL DEFAULT 'pending',
  started_at DATETIME(3) NULL,
  term_end DATETIME(3) NULL,
  renewal ENUM('auto','none') NOT NULL DEFAULT 'none',
  renewal_term_months INT NOT NULL DEFAULT 0,
  notice_days INT NOT NULL DEFAULT 30,
  cancel_requested_at DATETIME(3) NULL,
  cancel_effective_at DATETIME(3) NULL,
  cancelled_at DATETIME(3) NULL,
  resource_id CHAR(36) NULL,
  price_snapshot_json JSON NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  INDEX (org_id), INDEX (status),
  FOREIGN KEY (org_id) REFERENCES organizations(id),
  FOREIGN KEY (order_item_id) REFERENCES order_items(id),
  FOREIGN KEY (product_version_id) REFERENCES product_versions(id),
  FOREIGN KEY (resource_id) REFERENCES resources(id) ON DELETE SET NULL
);