-- Таблица Categories
CREATE TABLE Categories (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name VARCHAR(100) NOT NULL,
    description TEXT
);

-- Таблица Inventory
CREATE TABLE Inventory (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    category_id INTEGER NOT NULL,
    name VARCHAR(200) NOT NULL,
    base_price DECIMAL(10,2) NOT NULL,
    season_type VARCHAR(10) NOT NULL,
    FOREIGN KEY (category_id) REFERENCES Categories(id) ON DELETE RESTRICT
);

-- Таблица Partners
CREATE TABLE Partners (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name VARCHAR(200) NOT NULL,
    phone VARCHAR(20),
    email VARCHAR(100),
    address TEXT
);

-- Таблица IssueOrders
CREATE TABLE IssueOrders (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    partner_id INTEGER NOT NULL,
    issue_date DATETIME NOT NULL,
    notes TEXT,
    FOREIGN KEY (partner_id) REFERENCES Partners(id) ON DELETE RESTRICT
);

-- Таблица IssueOrderItems
CREATE TABLE IssueOrderItems (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    issue_order_id INTEGER NOT NULL,
    inventory_id INTEGER NOT NULL,
    quantity INTEGER NOT NULL CHECK (quantity > 0),
    FOREIGN KEY (issue_order_id) REFERENCES IssueOrders(id) ON DELETE CASCADE,
    FOREIGN KEY (inventory_id) REFERENCES Inventory(id) ON DELETE RESTRICT
);

-- Таблица ReturnOrders
CREATE TABLE ReturnOrders (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    issue_order_id INTEGER NOT NULL UNIQUE,
    return_date DATETIME NOT NULL,
    total_amount DECIMAL(10,2),
    notes TEXT,
    FOREIGN KEY (issue_order_id) REFERENCES IssueOrders(id) ON DELETE CASCADE
);

-- Таблица ReturnOrderItems
CREATE TABLE ReturnOrderItems (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    return_order_id INTEGER NOT NULL,
    inventory_id INTEGER NOT NULL,
    quantity INTEGER NOT NULL CHECK (quantity > 0),
    wear_level VARCHAR(10) NOT NULL,
    calculated_price DECIMAL(10,2),
    FOREIGN KEY (return_order_id) REFERENCES ReturnOrders(id) ON DELETE CASCADE,
    FOREIGN KEY (inventory_id) REFERENCES Inventory(id) ON DELETE RESTRICT
);