Implement a bunch of stuff.

Things are coming along fast!

api.php

@@ -17,6 +17,9 @@ $autoloader->register();
 
 $di_builder = new DI\ContainerBuilder();
 $di_builder->addDefinitions("di_config.php");
+// TODO: In production, we should use something like this - see http://php-di.org/doc/container-configuration.html
+// $builder->enableCompilation(__DIR__ . '/tmp');
+// $builder->writeProxiesToFile(true, __DIR__ . '/tmp/proxies');
 
 $di_container = $di_builder->build();
 

di_config.php

@@ -3,6 +3,13 @@
 use Psr\Container\ContainerInterface;
 use SBRL\TomlConfig;
 
+use AirQuality\Repositories\IDeviceRepository;
+use AirQuality\Repositories\MariaDBDeviceRepository;
+use AirQuality\Repositories\IMeasurementDataRepository;
+use AirQuality\Repositories\MariaDBMeasurementDataRepository;
+use AirQuality\Repositories\IMeasurementTypeRepository;
+use AirQuality\Repositories\MariaDBMeasurementTypeRepository;
+
 return [
 	"settings.file_default" => "data/settings.toml",
 	"settings.file_custom" => "settings.default.toml",
@@ -14,5 +21,10 @@ return [
 		);
 	},
 	
+	IDeviceRepository::class => DI\autowire(MariaDBDeviceRepository::class),
+	IMeasurementDataRepository::class => DI\autowire(MariaDBMeasurementDataRepository::class),
+	IMeasurementTypeRepository::class => DI\autowire(MariaDBMeasurementTypeRepository::class),
+	
+	
 	\SBRL\SessionManager::class => DI\factory([ \SBRL\SessionManager::class, "get_instance" ])
 ];

logic/Actions/FetchData.php

@@ -2,34 +2,84 @@
 
 namespace AirQuality\Actions;
 
+use \SBRL\TomlConfig;
+use \AirQuality\Repositories\IMeasurementDataRepository;
+use \AirQuality\Repositories\IMeasurementTypeRepository;
+use \AirQuality\ApiResponseSender;
 
-class FetchData {
+use \AirQuality\Validator;
+use \AirQuality\PerfFormatter;
+
+class FetchData implements IAction {
+	/** @var TomlConfig */
 	private $settings;
+	/** @var IMeasurementDataRepository */
+	private $measurement_repo;
+	
+	/** @var IMeasurementTypeRepository */
+	private $type_repo;
+	
+	/** @var ApiResponseSender */
+	private $sender;
+	
+	/** @var Validator */
 	private $validator;
 	
 	public function __construct(
-		\SBRL\TomlConfig $in_settings) {
+		TomlConfig $in_settings,
+		IMeasurementDataRepository $in_measurement_repo,
+		IMeasurementTypeRepository $in_type_repo,
+		ApiResponseSender $in_sender) {
 		$this->settings = $in_settings;
-		$this->validator = new \AirQuality\Validator($_GET);
+		$this->measurement_repo = $in_measurement_repo;
+		$this->type_repo = $in_type_repo;
+		$this->sender = $in_sender;
+		
+		$this->validator = new Validator($_GET);
 	}
 	
-	public function handle() : Boolean {
+	public function handle() : boolean {
 		global $start_time;
 		
+		$start_handle = microtime(true);
+		
 		// 1: Validate params
 		$this->validator->is_datetime("datetime");
+		$this->validator->exists("reading_type");
+		$this->validator->is_max_length("reading_type", 256);
 		$this->validator->run();
 		
+		if(!$this->type_repo->is_valid_type($_GET["reading_type"])) {
+			$this->sender->send_error_plain(
+				400, "Error: That reading type is invalid.", [
+					[ "x-time-taken", PerfFormatter::format_perf_data($start_time, $start_handle, null) ]
+				]
+			);
+			return false;
+		}
+		
 		// 2: Pull data from database
+		$data = $this->measurement_repo->get_readings_by_date(
+			new \DateTime($_GET["datetime"]),
+			$_GET["reading_type"]
+		);
 		
 		// 2.5: Validate data from database
+		if(empty($data)) {
+			http_response_code(404);
+			header("content-type: text/plain");
+			header("x-time-taken: " . PerfFormatter::format_perf_data($start_time, $start_handle, null));
+			echo("Error: No data could be found for that timestamp.");
+			return false;
+		}
 		
 		// 3: Serialise data
-		$response = json_encode("Coming soon");
+		$start_encode = microtime(true);
+		$response = json_encode($data);
 		
 		// 4: Send response
-		header("x-time-taken: " . (microtime(true) - $start_time) . "ms");
 		header("content-type: application/json");
+		header("x-time-taken: " . PerfFormatter::format_perf_data($start_time, $start_handle, $start_encode));
 		echo($response);
 		return true;
 	}

logic/Actions/IAction.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace AirQuality\Actions;
+
+interface IAction {
+    public function handle() : boolean;
+}

logic/ApiResponseSender.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace AirQuality;
+
+/**
+ * Automates the sending of API responses.
+ */
+class ApiResponseSender
+{
+	
+	function __construct() {
+		
+	}
+	
+	public function send_error_plain($code, $message, $extra_headers = []) {
+		http_response_code($code);
+		header("content-type: text/plain");
+		header("content-length: " . strlen($message)); // strlen isn't multibyte-safe, so it'll give us the actual length of the string in bytes, not characters - which is precisely what we want here :D
+		foreach($extra_headers as $header)
+			header("{$header[0]}: {$header[1]}");
+		
+		echo($message);
+	}
+}

logic/Database.php

@@ -14,10 +14,10 @@ class Database
 	
 	private $pdo_options = [
 		// https://devdocs.io/php/pdo.setattribute
-	    PDO::ATTR_ERRMODE				=> PDO::ERRMODE_EXCEPTION,
-	    PDO::ATTR_DEFAULT_FETCH_MODE	=> PDO::FETCH_ASSOC,
-	    PDO::ATTR_EMULATE_PREPARES		=> false,
-		PDO::ATTR_AUTOCOMMIT			=> false
+	    \PDO::ATTR_ERRMODE				=> \PDO::ERRMODE_EXCEPTION,
+	    \PDO::ATTR_DEFAULT_FETCH_MODE	=> \PDO::FETCH_ASSOC,
+	    \PDO::ATTR_EMULATE_PREPARES		=> false,
+		\PDO::ATTR_AUTOCOMMIT			=> false
 	];
 	
 	function __construct(\SBRL\TomlConfig $in_settings) {
@@ -29,6 +29,7 @@ class Database
 			$this->get_connection_string(),
 			$this->settings->get("database.username"),
 			$this->settings->get("database.password"),
+			$this->pdo_options
 		);
 		// Make this connection read-only
 		if(self::read_only)

logic/PerfFormatter.php

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Formats performance data to be sent in a HTTP header.
+ */
+class PerfFormatter {
+	function __construct() {
+		
+	}
+	
+	public static function format_perf_data($start_init, $start_handle, $start_encode) {
+		$now = microtime(true);
+		
+		$time_total = round($now - $start_init, 2);
+		$time_setup = round($start_handle - $start_init, 2);
+		$time_handle = round(($start_encode ?? $now) - $start_handle, 2);
+		$time_encode = round($now - $start_encode, 2);
+		
+		$result = "{$time_total}ms total | {$time_setup}ms setup, {$time_handle}ms handle";
+		if(!empty($start_encode))
+			$result .= ", {$time_encode}ms encode";
+		
+		return $result;
+	}
+}

logic/Repositories/IDeviceRepository.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace AirQuality\Repositories;
+
+interface IDeviceRepository {
+    
+}

logic/Repositories/IMeasurementDataRepository.php

@@ -3,5 +3,5 @@
 namespace AirQuality\Repositories;
 
 interface IMeasurementDataRepository {
-    public function get_readings_by_date(DateTime $datetime, string $reading_type);
+    public function get_readings_by_date(\DateTime $datetime, string $reading_type);
 }

logic/Repositories/IMeasurementTypeRepository.php

@@ -3,6 +3,23 @@
 namespace AirQuality\Repositories;
 
 interface IMeasurementTypeRepository {
-	public function is_valid_type();
+	/**
+	 * Returns whether the specified type is valid or not.
+	 * @param	string	$type_name	The name of the type to validate.
+	 * @return	boolean	Whether the specified type name is valid or not.
+	 */
+	public function is_valid_type(string $type_name);
+	
+	/**
+	 * Gets the friendly name for the specified type name.
+	 * @param	string	$type_name	The type name to get the friendly name for.
+	 * @return	string	The friendly name for the specified type name.
+	 */
+	public function get_friendly_name(string $type_name);
+	
+	/**
+	 * Returns all the currently known meeasurement types.
+	 * @return	array	All the measurement types currently known.
+	 */
     public function get_all_types();
 }

logic/Repositories/MariaDBDeviceRepository.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace AirQuality\Repositories;
+
+/**
+ * Fetches device info from a MariaDB database.
+ */
+class MariaDBDeviceRepository implements IDeviceRepository {
+	public static $table_name = "devices";
+	public static $column_device_id = "device_id";
+	public static $column_device_name = "device_name";
+	public static $column_device_type = "device_type";
+	public static $column_owner_id = "owner_id";
+	public static $column_lat = "device_latitude";
+	public static $column_long = "device_longitude";
+	
+	// ------------------------------------------------------------------------
+	
+	/**
+	 * The database connection.
+	 * @var \AirQuality\Database
+	 */
+	private $database;
+	
+	function __construct(\AirQuality\Database $in_database) {
+		$this->database = $in_database;
+	}
+	
+}

logic/Repositories/MariaDBMeasurementDataRepository.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace AirQuality\Repositories;
+
+/**
+ * Fetches measurement readings from a MariaDB database.
+ */
+class MariaDBMeasurementDataRepository implements IMeasurementDataRepository {
+	public static $table_name_metadata = "readings";
+	public static $table_name_values = "reading_values";
+	
+	public static $column_values_id = "id";
+	public static $column_values_reading_id = "reading_id";
+	public static $column_values_value = "value";
+	public static $column_values_reading_value_types_id = "reading_value_types_id";
+	
+	public static $column_metadata_id = "id";
+	public static $column_metadata_storedon = "storedon";
+	public static $column_metadata_recordedon = "recordedon";
+	public static $column_metadata_device_id = "device_id";
+	public static $column_metadata_lat = "reading_latitude";
+	public static $column_metadata_long = "reading_longitude";
+	
+	// ------------------------------------------------------------------------
+	
+	/**
+	 * The database connection.
+	 * @var \AirQuality\Database
+	 */
+	private $database;
+	
+	function __construct(\AirQuality\Database $in_database) {
+		$this->database = $in_database;
+	}
+	
+	public function get_readings_by_date(\DateTime $datetime, string $reading_type) {
+		return $this->database->query(
+			"SELECT
+				$this->table_name_values.*,
+				$this->table_name_metadata.device_id,
+				COALESCE(
+					$this->table_name_metadata.$this->column_metadata_recordedon,
+					$this->table_name_metadata.$this->column_metadata_storedon
+				) AS datetime,
+				COALESCE(
+					$this->table_name_metadata.$this->column_metadata_lat,
+					{MariaDBDeviceRepository::$table_name}.device_latitude
+				) AS latitude,
+				COALESCE(
+					$this->table_name_metadata.$this->column_metadata_long,
+					devices.device_longitude
+				) AS longitude
+			FROM $this->table_name_values
+			JOIN $this->table_name_metadata ON $this->table_name_values.$this->column_values_reading_id = $this->table_name_metadata.id
+			JOIN devices ON $this->table_name_metadata.$this->column_metadata_device_id = devices.device_id
+			WHERE COALESCE(
+				$this->table_name_metadata.$this->column_metadata_recordedon,
+				$this->table_name_metadata.$this->column_metadata_storedon
+			) = :datetime",
+			[
+				"datetime" => $datetime,
+				"reading_type" => $reading_type
+			]
+		);
+	}
+}

logic/Repositories/MariaDBMeasurementTypeRepository.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace AirQuality\Repositories;
+
+/**
+ * Fetches device info from a MariaDB database.
+ */
+class MariaDBMeasurementTypeRepository implements IMeasurementTypeRepository {
+	public static $table_name = "reading_value_types";
+	
+	public static $column_id = "id";
+	public static $column_friendly_text = "friendly_text";
+	
+	// ------------------------------------------------------------------------
+	
+	/**
+	 * The database connection.
+	 * @var \AirQuality\Database
+	 */
+	private $database;
+	
+	function __construct(\AirQuality\Database $in_database) {
+		$this->database = $in_database;
+	}
+	
+	
+	
+	public function is_valid_type(string $type_name) {
+		throw new Exception("Error: Not implemented yet :-\\");
+	}
+	public function get_friendly_name(string $type_name) {
+		// TODO: Cache results here? Maybe https://packagist.org/packages/thumbtack/querycache will be of some use
+		throw new Exception("Error: Not implemented yet :-\\");
+	}
+	
+    public function get_all_types() {
+		throw new Exception("Error: Not implemented yet :-\\");
+	}
+}

logic/Validator.php

@@ -66,17 +66,6 @@ class Validator {
 		);
 	}
 
-	public function is_valid_email($key) {
-		$this->add_test(
-			$key,
-			function($data) {
-				$validator = new \EmailValidator\Validator();
-				return $validator->isValid($data);
-			},
-			400,
-			"That email address isn't valid."
-		);
-	}
 	
 	public function is_datetime($key) {
 		$this->add_test(