-- ElectVote Database Schema
-- Create database
CREATE DATABASE IF NOT EXISTS electvote CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
USE electvote;

-- Positions table
CREATE TABLE IF NOT EXISTS positions (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    winner_count INT NOT NULL DEFAULT 1,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Sessions table
CREATE TABLE IF NOT EXISTS sessions (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(200) NOT NULL,
    description TEXT,
    status ENUM('draft', 'open', 'closed') DEFAULT 'draft',
    start_datetime DATETIME NOT NULL,
    end_datetime DATETIME NOT NULL,
    winner_count INT NOT NULL DEFAULT 1,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

-- Candidates table
CREATE TABLE IF NOT EXISTS candidates (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(200) NOT NULL,
    position_id INT,
    session_id INT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (position_id) REFERENCES positions(id) ON DELETE SET NULL,
    FOREIGN KEY (session_id) REFERENCES sessions(id) ON DELETE CASCADE
);

-- Rooms table
CREATE TABLE IF NOT EXISTS rooms (
    id INT AUTO_INCREMENT PRIMARY KEY,
    session_id INT NOT NULL,
    room_name VARCHAR(100) NOT NULL,
    qr_code TEXT,
    qr_token VARCHAR(64) UNIQUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (session_id) REFERENCES sessions(id) ON DELETE CASCADE
);

-- Votes table
CREATE TABLE IF NOT EXISTS votes (
    id INT AUTO_INCREMENT PRIMARY KEY,
    session_id INT NOT NULL,
    room_id INT NOT NULL,
    candidate_id INT NOT NULL,
    voter_token VARCHAR(64) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (session_id) REFERENCES sessions(id) ON DELETE CASCADE,
    FOREIGN KEY (room_id) REFERENCES rooms(id) ON DELETE CASCADE,
    FOREIGN KEY (candidate_id) REFERENCES candidates(id) ON DELETE CASCADE
);

-- Voter tokens table (tracks who has voted per room)
CREATE TABLE IF NOT EXISTS voter_tokens (
    id INT AUTO_INCREMENT PRIMARY KEY,
    room_id INT NOT NULL,
    session_id INT NOT NULL,
    token VARCHAR(64) NOT NULL UNIQUE,
    has_voted TINYINT(1) DEFAULT 0,
    voted_at TIMESTAMP NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (room_id) REFERENCES rooms(id) ON DELETE CASCADE,
    FOREIGN KEY (session_id) REFERENCES sessions(id) ON DELETE CASCADE
);

-- Admin users table
CREATE TABLE IF NOT EXISTS admin_users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password_hash VARCHAR(255) NOT NULL,
    email VARCHAR(100),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Insert default admin (password: admin123)
INSERT INTO admin_users (username, password_hash, email) 
VALUES ('admin', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'admin@electvote.com')
ON DUPLICATE KEY UPDATE username = username;

-- Sample data for positions
INSERT INTO positions (name) VALUES 
('President'), ('Vice President'), ('Secretary'), ('Treasurer'), ('Auditor')
ON DUPLICATE KEY UPDATE name = name;