<?php
declare(strict_types=1);

require_once __DIR__ . '/../db/config.php';

function e(string $value): string {
    return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
}

function check_admin_auth(): bool {
    session_start();
    return isset($_SESSION['user_type']) && $_SESSION['user_type'] === 'admin';
}

function ensure_tables(): void {
    $pdo = db();

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS twilio_numbers (
            id INT AUTO_INCREMENT PRIMARY KEY,
            label VARCHAR(120) NOT NULL,
            account_sid VARCHAR(64) NOT NULL,
            auth_token VARCHAR(128) NOT NULL,
            api_key VARCHAR(128) DEFAULT NULL,
            from_number VARCHAR(32) NOT NULL,
            is_active TINYINT(1) NOT NULL DEFAULT 1,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS contacts (
            id INT AUTO_INCREMENT PRIMARY KEY,
            name VARCHAR(120) DEFAULT NULL,
            phone VARCHAR(32) NOT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            UNIQUE KEY uniq_phone (phone)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS conversations (
            id INT AUTO_INCREMENT PRIMARY KEY,
            contact_id INT NOT NULL,
            twilio_number_id INT NOT NULL,
            last_message_at TIMESTAMP NULL DEFAULT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            INDEX idx_contact (contact_id),
            INDEX idx_twilio (twilio_number_id),
            CONSTRAINT fk_convo_contact FOREIGN KEY (contact_id) REFERENCES contacts(id) ON DELETE CASCADE,
            CONSTRAINT fk_convo_twilio FOREIGN KEY (twilio_number_id) REFERENCES twilio_numbers(id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS messages (
            id INT AUTO_INCREMENT PRIMARY KEY,
            conversation_id INT NOT NULL,
            direction ENUM('inbound','outbound') NOT NULL,
            body TEXT NOT NULL,
            status VARCHAR(32) DEFAULT 'stored',
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            INDEX idx_convo (conversation_id),
            CONSTRAINT fk_msg_convo FOREIGN KEY (conversation_id) REFERENCES conversations(id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
    ");

    $pdo->exec("
        CREATE TABLE IF NOT EXISTS billing_snapshots (
            id INT AUTO_INCREMENT PRIMARY KEY,
            twilio_number_id INT NOT NULL,
            period_start DATE NOT NULL,
            period_end DATE NOT NULL,
            usage_count INT DEFAULT 0,
            cost DECIMAL(10,4) DEFAULT 0,
            currency VARCHAR(12) DEFAULT 'USD',
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            INDEX idx_bill_twilio (twilio_number_id),
            CONSTRAINT fk_bill_twilio FOREIGN KEY (twilio_number_id) REFERENCES twilio_numbers(id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
    ");
}

ensure_tables();