-- Migration: Add HR Module
-- 1. Departments
CREATE TABLE IF NOT EXISTS hr_departments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    description TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 2. Employees (Linked to users optionally)
CREATE TABLE IF NOT EXISTS hr_employees (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT UNIQUE DEFAULT NULL, -- Link to system login if applicable
    department_id INT,
    first_name VARCHAR(50) NOT NULL,
    last_name VARCHAR(50) NOT NULL,
    email VARCHAR(100),
    phone VARCHAR(20),
    gender ENUM('male', 'female') DEFAULT 'male',
    birth_date DATE,
    join_date DATE NOT NULL,
    job_title VARCHAR(100),
    basic_salary DECIMAL(10, 2) DEFAULT 0.00,
    status ENUM('active', 'terminated', 'resigned', 'on_leave') DEFAULT 'active',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL,
    FOREIGN KEY (department_id) REFERENCES hr_departments(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 3. Attendance
CREATE TABLE IF NOT EXISTS hr_attendance (
    id INT AUTO_INCREMENT PRIMARY KEY,
    employee_id INT NOT NULL,
    date DATE NOT NULL,
    check_in TIME,
    check_out TIME,
    status ENUM('present', 'absent', 'late', 'excused', 'holiday') DEFAULT 'absent',
    notes TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY emp_date (employee_id, date),
    FOREIGN KEY (employee_id) REFERENCES hr_employees(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 4. Leaves
CREATE TABLE IF NOT EXISTS hr_leaves (
    id INT AUTO_INCREMENT PRIMARY KEY,
    employee_id INT NOT NULL,
    leave_type ENUM('annual', 'sick', 'unpaid', 'maternity', 'emergency', 'other') NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    days_count INT DEFAULT 1,
    reason TEXT,
    status ENUM('pending', 'approved', 'rejected') DEFAULT 'pending',
    approved_by INT DEFAULT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (employee_id) REFERENCES hr_employees(id) ON DELETE CASCADE,
    FOREIGN KEY (approved_by) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 5. Holidays
CREATE TABLE IF NOT EXISTS hr_holidays (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    date_from DATE NOT NULL,
    date_to DATE NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 6. Payroll
CREATE TABLE IF NOT EXISTS hr_payroll (
    id INT AUTO_INCREMENT PRIMARY KEY,
    employee_id INT NOT NULL,
    month INT NOT NULL,
    year INT NOT NULL,
    basic_salary DECIMAL(10, 2) NOT NULL,
    bonuses DECIMAL(10, 2) DEFAULT 0.00,
    deductions DECIMAL(10, 2) DEFAULT 0.00,
    net_salary DECIMAL(10, 2) NOT NULL,
    status ENUM('pending', 'paid') DEFAULT 'pending',
    payment_date DATE,
    notes TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY emp_period (employee_id, month, year),
    FOREIGN KEY (employee_id) REFERENCES hr_employees(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Permissions for HR module (Assign to Admin by default)
INSERT IGNORE INTO user_permissions (user_id, page, can_view, can_add, can_edit, can_delete)
SELECT id, 'hr_dashboard', 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0) 
FROM users;

INSERT IGNORE INTO user_permissions (user_id, page, can_view, can_add, can_edit, can_delete)
SELECT id, 'hr_employees', 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0) 
FROM users;

INSERT IGNORE INTO user_permissions (user_id, page, can_view, can_add, can_edit, can_delete)
SELECT id, 'hr_attendance', 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0) 
FROM users;

INSERT IGNORE INTO user_permissions (user_id, page, can_view, can_add, can_edit, can_delete)
SELECT id, 'hr_leaves', 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0) 
FROM users;

INSERT IGNORE INTO user_permissions (user_id, page, can_view, can_add, can_edit, can_delete)
SELECT id, 'hr_payroll', 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0) 
FROM users;

INSERT IGNORE INTO user_permissions (user_id, page, can_view, can_add, can_edit, can_delete)
SELECT id, 'hr_reports', 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0), 
    IF(role = 'admin', 1, 0) 
FROM users;