-- Clean slate for development
SET FOREIGN_KEY_CHECKS = 0;
DROP TABLE IF EXISTS audit_logs;
DROP TABLE IF EXISTS votes;
DROP TABLE IF EXISTS candidates;
DROP TABLE IF EXISTS positions;
DROP TABLE IF EXISTS election_assignments;
DROP TABLE IF EXISTS elections;
DROP TABLE IF EXISTS users;
SET FOREIGN_KEY_CHECKS = 1;

-- Production-Ready Schema for Online Election System
CREATE TABLE users (
    id CHAR(36) PRIMARY KEY,
    student_id VARCHAR(10) UNIQUE NOT NULL, -- Format: XX-XXXX
    name VARCHAR(255) NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    grade_level INT NULL,
    track VARCHAR(100) NULL,
    section VARCHAR(100) NULL,
    role ENUM('Admin', 'Adviser', 'Officer', 'Voter') DEFAULT 'Voter',
    access_level INT DEFAULT 0,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP NULL
);

CREATE TABLE elections (
    id CHAR(36) PRIMARY KEY,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    status ENUM('Preparing', 'Ongoing', 'Finished') DEFAULT 'Preparing',
    start_date_and_time TIMESTAMP NOT NULL,
    end_date_and_time TIMESTAMP NOT NULL,
    created_by CHAR(36) NOT NULL,
    archived BOOLEAN DEFAULT FALSE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (created_by) REFERENCES users(id)
);

CREATE TABLE election_assignments (
    id CHAR(36) PRIMARY KEY,
    election_id CHAR(36) NOT NULL,
    user_id CHAR(36) NOT NULL,
    role_in_election ENUM('Adviser', 'Officer', 'Candidate', 'Voter') DEFAULT 'Voter',
    assigned_by CHAR(36) NOT NULL,
    assigned_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (election_id) REFERENCES elections(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (assigned_by) REFERENCES users(id)
);

CREATE TABLE positions (
    id CHAR(36) PRIMARY KEY,
    election_id CHAR(36) NOT NULL,
    name VARCHAR(255) NOT NULL,
    max_votes INT DEFAULT 1,
    sort_order INT DEFAULT 0,
    FOREIGN KEY (election_id) REFERENCES elections(id) ON DELETE CASCADE
);

CREATE TABLE candidates (
    id CHAR(36) PRIMARY KEY,
    election_id CHAR(36) NOT NULL,
    position_id CHAR(36) NOT NULL,
    user_id CHAR(36) NOT NULL,
    party_name VARCHAR(255) NULL,
    manifesto TEXT NULL,
    approved BOOLEAN DEFAULT FALSE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (election_id) REFERENCES elections(id) ON DELETE CASCADE,
    FOREIGN KEY (position_id) REFERENCES positions(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);

CREATE TABLE votes (
    id CHAR(36) PRIMARY KEY,
    election_id CHAR(36) NOT NULL,
    position_id CHAR(36) NOT NULL,
    candidate_id CHAR(36) NOT NULL,
    voter_id CHAR(36) NOT NULL,
    casted_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    ip_address VARCHAR(45),
    user_agent TEXT,
    UNIQUE KEY unique_vote (election_id, position_id, voter_id),
    FOREIGN KEY (election_id) REFERENCES elections(id),
    FOREIGN KEY (position_id) REFERENCES positions(id),
    FOREIGN KEY (candidate_id) REFERENCES candidates(id),
    FOREIGN KEY (voter_id) REFERENCES users(id)
);

CREATE TABLE audit_logs (
    id CHAR(36) PRIMARY KEY,
    user_id CHAR(36) NULL,
    action VARCHAR(255) NOT NULL,
    table_name VARCHAR(100) NULL,
    record_id CHAR(36) NULL,
    old_values TEXT NULL,
    new_values TEXT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id)
);

-- Insert a default admin (password is 'admin123')
INSERT INTO users (id, student_id, name, email, password_hash, role, access_level) 
VALUES ('admin-uuid-1', '00-0000', 'Admin User', 'admin@school.edu', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'Admin', 4);