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<?php namespace Clockwork\DataSource;
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use Clockwork\Helpers\Serializer;
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use Clockwork\Helpers\StackTrace;
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use Clockwork\Request\Request;
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use Illuminate\Contracts\Events\Dispatcher as EventDispatcher;
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// Data source for Laravel redis component, provides redis commands
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class LaravelRedisDataSource extends DataSource
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{
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	// Event dispatcher instance
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	protected $eventDispatcher;
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	// Executed redis commands
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	protected $commands = [];
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	// Whether to skip Redis commands originating from Laravel cache Redis store
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	protected $skipCacheCommands = true;
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	// Create a new data source instance, takes an event dispatcher and additional options as arguments
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	public function __construct(EventDispatcher $eventDispatcher, $skipCacheCommands = true)
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	{
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		$this->eventDispatcher = $eventDispatcher;
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		$this->skipCacheCommands = $skipCacheCommands;
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		if ($this->skipCacheCommands) {
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			$this->addFilter(function ($command, $trace) {
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				return ! $trace->first(function ($frame) { return $frame->class == 'Illuminate\Cache\RedisStore'; });
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			});
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		}
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	}
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	// Adds redis commands to the request
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	public function resolve(Request $request)
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	{
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		$request->redisCommands = array_merge($request->redisCommands, $this->getCommands());
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		return $request;
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	}
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	// Reset the data source to an empty state, clearing any collected data
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	public function reset()
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	{
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		$this->commands = [];
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	}
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	// Listen to the cache events
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	public function listenToEvents()
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	{
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		$this->eventDispatcher->listen(\Illuminate\Redis\Events\CommandExecuted::class, function ($event) {
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			$this->registerCommand([
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				'command'    => $event->command,
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				'parameters' => $event->parameters,
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				'duration'   => $event->time,
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				'connection' => $event->connectionName,
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				'time'       => microtime(true) - $event->time / 1000
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			]);
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		});
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	}
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	// Collect an executed command
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	protected function registerCommand(array $command)
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	{
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		$trace = StackTrace::get()->resolveViewName();
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		$command = array_merge($command, [
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			'trace' => (new Serializer)->trace($trace)
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		]);
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		if ($this->passesFilters([ $command, $trace ])) {
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			$this->commands[] = $command;
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		}
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	}
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	// Get an array of executed redis commands
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	protected function getCommands()
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	{
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		return array_map(function ($query) {
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			return array_merge($query, [
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				'parameters' => isset($query['parameters']) ? (new Serializer)->normalize($query['parameters']) : null
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			]);
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		}, $this->commands);
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	}
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}