<?php /* Copyright (c) 2024 Freya Murphy */

class User {

	public ?string $dn;
	public ?string $username;
	public ?string $email;
	public ?string $first_name;
	public ?string $last_name;

	function __construct() {}

	/**
	 * Validates all required fields are set
	 */
	private function validate(): int {
		return (
			$this->dn == NULL ||
			$this->username == NULL ||
			$this->email == NULL
		) ? 1 : 0;
	}

	/**
	 * Loads Data from the array to self
	 * @param array $data - the data to load
	 * @return int 0 on success, 1 on error
     */
	public function from_array(array $data): int {
		$this->dn = NULL;
		$this->username = NULL;
		$this->email = NULL;
		$this->first_name = NULL;
		$this->last_name = NULL;

		foreach ($data as $key => $value) {
			if ($value == NULL)
				continue;
			$type = gettype($value);
			switch ($key) {
				case 'dn': {
					if ($type != 'string')
						return 1;
					$this->dn = $value;
				} break;
				case 'username': {
					if ($type != 'string')
						return 1;
					$this->username = $value;
				} break;
				case 'email': {
					if ($type != 'string')
						return 1;
					$this->email = $value;
				} break;
				case 'first_name': {
					if ($type != 'string')
						return 1;
					$this->first_name = $value;
				} break;
				case 'last_name': {
					if ($type != 'string')
						return 1;
					$this->last_name = $value;
				} break;
			}
		}

		return $this->validate();
	}

	/**
	 * Converts the user into an array
	 * @return ?array<string,string>
 	 */
	public function to_array(): ?array {
		if ($this->validate())
			return NULL;
		$data = array(
			'dn' => $this->dn,
			'username' => $this->username,
			'email' => $this->email
		);
		if ($this->first_name)
			$data['first_name'] = $this->first_name;
		if ($this->last_name)
			$data['last_name'] = $this->last_name;
		return $data;
	}

	/**
	 * Writes the HTTP headers
	 */
	public function write_headers(): int {
		if ($this->validate())
			return 1;

		$header_username = getenv("HTTP_USERNAME_HEADER");
		$header_email = getenv("HTTP_EMAIL_HEADER");
		$header_first = getenv("HTTP_FIRST_NAME_HEADER");
		$header_last = getenv("HTTP_LAST_NAME_HEADER");

		header("{$header_username}: {$this->username}");
		header("{$header_email}: {$this->email}");
		if ($this->first_name)
			header("{$header_first}: {$this->first_name}");
		if ($this->last_name)
			header("{$header_last}: {$this->last_name}");

		return 0;
	}

}

class Session {

	public ?User $user;
	public ?int $created;
	public ?int $expires;
	public ?string $token;

	private int $session_lifetime_seconds;

	function __construct() {
		$this->session_lifetime_seconds = 60 * 60 * 24 * 3;
	}

	/**
	 * Validates all required fields are set
	 */
	private function validate(): int {
		if (
			$this->user == NULL ||
			$this->created == NULL ||
			$this->expires == NULL ||
			$this->token == NULL
		) {
			return 1;
		}
		if ($this->expires < time())
			return 1;
		return 0;
	}

	/**
	 * Loads Data from the array to self
	 * @param array $data - the data to load
	 * @return int 0 on success, 1 on error
     */
	public function from_array(array $data): int {
		$this->user = NULL;
		$this->created = NULL;
		$this->expires = NULL;
		$this->token = NULL;

		foreach ($data as $key => $value) {
			if ($value == NULL)
				continue;
			$type = gettype($value);
			switch ($key) {
				case 'user': {
					$this->user = new User();
					if ($this->user->from_array($value))
						return 1;
				} break;
				case 'created': {
					if ($type != 'integer')
						return 1;
					$this->created = $value;
				} break;
				case 'expires': {
					if ($type != 'integer')
						return 1;
					$this->expires = $value;
				} break;
				case 'token': {
					if ($type != 'string')
						return 1;
					$this->token = $value;
				} break;
			}
		}

		return $this->validate();
	}

	/**
	 * Renew the expiry clock
	 */
	public function reset_expiry(): void {
		$this->expires = time() + $this->session_lifetime_seconds;
	}

	/**
	 * Converts the session into an array
     * @return ?array<string,mixed>
 	 */
	public function to_array(): ?array {
		if ($this->validate())
			return NULL;
		return array(
			'user' => $this->user->to_array(),
			'created' => $this->created,
			'expires' => $this->expires,
			'token' => $this->token
		);
	}

	/**
	 * Writes the HTTP headers
	 */
	public function write_headers(): int {
		if ($this->validate())
			return 1;
		if ($this->user->write_headers())
			return 1;

		$cookie_name = getenv("COOKIE_NAME");
		$cookie_options = array (
	         'expires' => $this->expires,
	         'path' => '/',
			 'domain' => getenv("COOKIE_DOMAIN"),
			 'secure' => true,
			 'httponly' => true,
			 'samesite' => 'Lax'
	    );
		setcookie(
			$cookie_name,
			$this->token,
			$cookie_options
		);

		return 0;
	}

}