-- Migration: Initial Schema
CREATE TABLE IF NOT EXISTS users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    full_name VARCHAR(100),
    role ENUM('admin', 'clerk', 'staff') DEFAULT 'staff',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS mailbox (
    id INT AUTO_INCREMENT PRIMARY KEY,
    type ENUM('inbound', 'outbound') NOT NULL,
    ref_no VARCHAR(50) NOT NULL UNIQUE,
    date_registered DATE NOT NULL,
    sender VARCHAR(255),
    recipient VARCHAR(255),
    subject VARCHAR(255) NOT NULL,
    description TEXT,
    status ENUM('received', 'in_progress', 'closed') DEFAULT 'received',
    assigned_to INT,
    created_by INT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (assigned_to) REFERENCES users(id) ON DELETE SET NULL,
    FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS attachments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    mail_id INT NOT NULL,
    file_path VARCHAR(255) NOT NULL,
    file_name VARCHAR(255) NOT NULL,
    file_size INT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (mail_id) REFERENCES mailbox(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS comments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    mail_id INT NOT NULL,
    user_id INT,
    comment TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (mail_id) REFERENCES mailbox(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Initial Admin User (password: admin123)
INSERT INTO users (username, password, full_name, role) 
VALUES ('admin', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'مدير النظام', 'admin')
ON DUPLICATE KEY UPDATE username=username;