CREATE TABLE IF NOT EXISTS leads (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    company VARCHAR(255),
    status VARCHAR(50) NOT NULL DEFAULT 'New',
    value DECIMAL(10, 2),
    tag VARCHAR(50),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    email VARCHAR(255) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    role ENUM('admin', 'sdr') NOT NULL DEFAULT 'sdr',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS settings (
    id INT AUTO_INCREMENT PRIMARY KEY,
    `key` VARCHAR(255) NOT NULL UNIQUE,
    `value` TEXT
);

CREATE TABLE IF NOT EXISTS messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    lead_id INT NOT NULL,
    sender ENUM('user', 'ai') NOT NULL,
    message TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (lead_id) REFERENCES leads(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS invitations (
    id INT AUTO_INCREMENT PRIMARY KEY,
    email VARCHAR(255) NOT NULL,
    token VARCHAR(255) NOT NULL UNIQUE,
    expires_at DATETIME NOT NULL,
    is_registered BOOLEAN NOT NULL DEFAULT false
);

CREATE TABLE IF NOT EXISTS events (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    lead_id INT,
    title VARCHAR(255) NOT NULL,
    start_time DATETIME NOT NULL,
    end_time DATETIME NOT NULL,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (lead_id) REFERENCES leads(id) ON DELETE SET NULL
);