-- Add user_id to employees to link with login
ALTER TABLE employees ADD COLUMN IF NOT EXISTS user_id INT NULL;
ALTER TABLE employees ADD COLUMN IF NOT EXISTS join_date DATE NULL;

-- Attendance
CREATE TABLE IF NOT EXISTS attendance_logs (
    id INT AUTO_INCREMENT PRIMARY KEY,
    employee_id INT NOT NULL,
    date DATE NOT NULL,
    check_in DATETIME NULL,
    check_out DATETIME NULL,
    status ENUM('Present', 'Late', 'Absent', 'On Leave') DEFAULT 'Present',
    source VARCHAR(50) DEFAULT 'Web',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (employee_id) REFERENCES employees(id) ON DELETE CASCADE
);

-- Leaves
CREATE TABLE IF NOT EXISTS leave_requests (
    id INT AUTO_INCREMENT PRIMARY KEY,
    employee_id INT NOT NULL,
    leave_type VARCHAR(50) NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    days INT NOT NULL,
    reason TEXT,
    status ENUM('Pending', 'Approved', 'Rejected') DEFAULT 'Pending',
    approved_by INT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (employee_id) REFERENCES employees(id) ON DELETE CASCADE
);

-- Salaries / Payroll Info
CREATE TABLE IF NOT EXISTS employee_salaries (
    id INT AUTO_INCREMENT PRIMARY KEY,
    employee_id INT NOT NULL,
    basic_salary DECIMAL(10, 2) DEFAULT 0.00,
    housing_allowance DECIMAL(10, 2) DEFAULT 0.00,
    transport_allowance DECIMAL(10, 2) DEFAULT 0.00,
    other_allowance DECIMAL(10, 2) DEFAULT 0.00,
    currency VARCHAR(10) DEFAULT 'USD',
    effective_date DATE NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (employee_id) REFERENCES employees(id) ON DELETE CASCADE
);

-- Biometric Devices (for API auth)
CREATE TABLE IF NOT EXISTS biometric_devices (
    id INT AUTO_INCREMENT PRIMARY KEY,
    device_name VARCHAR(100) NOT NULL,
    ip_address VARCHAR(50),
    api_key VARCHAR(255) NOT NULL,
    status TINYINT(1) DEFAULT 1,
    last_seen DATETIME NULL
);