<?php
/*
 * This file is part of the Magallanes package.
*
* (c) Andrés Montañez <andres@andresmontanez.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Mage\Command\BuiltIn;

use Mage\Command\AbstractCommand;
use Mage\Command\RequiresEnvironment;
use Mage\Task\Factory;
use Mage\Task\Releases\SkipOnOverride;
use Mage\Task\ErrorWithMessageException;
use Mage\Task\SkipException;
use Mage\Console;
use Mage\Config;

use Exception;

/**
 * Command for Deploying
 *
 * @author Andrés Montañez <andres@andresmontanez.com>
 */
class DeployCommand extends AbstractCommand implements RequiresEnvironment
{
	/**
	 * Deploy has Failed
	 * @var string
	 */
	const FAILED      = 'failed';

	/**
	 * Deploy has Succeded
	 * @var string
	 */
	const SUCCEDED    = 'succeded';

	/**
	 * Deploy is in progress
	 * @var string
	 */
	const IN_PROGRESS = 'in_progress';

	/**
	 * Time the Deployment has Started
	 * @var integer
	 */
    protected $startTime = null;

    /**
     * Time the Deployment has Started to the current Host
     * @var integer
     */
    protected $startTimeHosts = null;

    /**
     * Time the Deployment to the Hosts has Finished
     * @var integer
     */
    protected $endTimeHosts = null;

    /**
     * Quantity of Hosts to Deploy to.
     * @var integer
     */
    protected $hostsCount = 0;

    /**
     * Current Status of the Deployment (in progress, succeded, failed)
     * @var string
     */
    protected static $deployStatus = 'in_progress';

    /**
     * Total of Failed tasks
     * @var integer
     */
    protected static $failedTasks = 0;

    /**
     * Returns the Status of the Deployment
     *
     * @return string
     */
    public static function getStatus()
    {
    	return self::$deployStatus;
    }

    /**
     * Deploys the Application
     * @see \Mage\Command\AbstractCommand::run()
     */
    public function run()
    {
        // Check if Environment is not Locked
    	$lockFile = '.mage/' . $this->getConfig()->getEnvironment() . '.lock';
    	if (file_exists($lockFile)) {
    		Console::output('<red>This environment is locked!</red>', 1, 2);
    		return;
    	}

    	// Check for running instance and Lock
    	if (file_exists('.mage/~working.lock')) {
    		Console::output('<red>There is already an instance of Magallanes running!</red>', 1, 2);
    		return;
    	} else {
    		touch('.mage/~working.lock');
    	}

        // Release ID
        $this->getConfig()->setReleaseId(date('YmdHis'));

        // Deploy Summary
        Console::output('<dark_gray>Deploy summary</dark_gray>', 1, 1);

        // Deploy Summary - Environment
        Console::output('<dark_gray>Environment:</dark_gray> <purple>' . $this->getConfig()->getEnvironment() . '</purple>', 2, 1);

        // Deploy Summary - Releases
        if ($this->getConfig()->release('enabled', false)) {
        	Console::output('<dark_gray>Release ID:</dark_gray>  <purple>' . $this->getConfig()->getReleaseId() . '</purple>', 2, 1);
        }

        // Deploy Summary - SCM
        if ($this->getConfig()->deployment('scm', false)) {
        	$scmConfig = $this->getConfig()->deployment('scm');
        	if (isset($scmConfig['branch'])) {
        		Console::output('<dark_gray>SCM Branch:</dark_gray>  <purple>' . $scmConfig['branch'] . '</purple>', 2, 1);
        	}
        }

        // Deploy Summary - Separator Line
        Console::output('', 0, 1);

        $this->startTime = time();

        // Run Pre-Deployment Tasks
        $this->runNonDeploymentTasks('pre-deploy', $this->getConfig(), 'Pre-Deployment');

        // Check Status
        if (self::$failedTasks > 0) {
        	self::$deployStatus = self::FAILED;
        	Console::output('A total of <dark_gray>' . self::$failedTasks . '</dark_gray> deployment tasks failed: <red>ABORTING</red>', 1, 2);

        } else {
        	// Run Deployment Tasks
        	$this->runDeploymentTasks();

        	// Check Status
        	if (self::$failedTasks > 0) {
        		self::$deployStatus = self::FAILED;
        		Console::output('A total of <dark_gray>' . self::$failedTasks . '</dark_gray> deployment tasks failed: <red>ABORTING</red>', 1, 2);
        	}

        	// Run Post-Deployment Tasks
        	$this->runNonDeploymentTasks('post-deploy', $this->getConfig(), 'Post-Deployment');
        }

        // Time Information Hosts
        if ($this->hostsCount > 0) {
            $timeTextHost = $this->transcurredTime($this->endTimeHosts - $this->startTimeHosts);
            Console::output('Time for deployment: <dark_gray>' . $timeTextHost . '</dark_gray>.');

            $timeTextPerHost = $this->transcurredTime(round(($this->endTimeHosts - $this->startTimeHosts) / $this->hostsCount));
            Console::output('Average time per host: <dark_gray>' . $timeTextPerHost . '</dark_gray>.');
        }

        // Time Information General
        $timeText = $this->transcurredTime(time() - $this->startTime);
        Console::output('Total time: <dark_gray>' . $timeText . '</dark_gray>.', 1, 2);

        // Send Notifications
        $this->sendNotification();

        // Unlock
        if (file_exists('.mage/~working.lock')) {
        	unlink('.mage/~working.lock');
        }
    }

    /**
     * Execute Pre and Post Deployment Tasks
     *
     * @param string $stage
     * @param Config $config
     * @param string $title
     */
    protected function runNonDeploymentTasks($stage, Config $config, $title)
    {
        $tasksToRun = $config->getTasks($stage);
        self::$failedTasks = 0;

        // PreDeployment Hook
        if ($stage == 'pre-deploy') {
        	// Look for Remote Source
        	if (is_array($config->deployment('source', null))) {
        		array_unshift($tasksToRun, 'scm/clone');
        	}

        	// Change Branch
        	if ($config->deployment('scm', false)) {
        		array_unshift($tasksToRun, 'scm/change-branch');
        	}
        }

        // PostDeployment Hook
        if ($stage == 'post-deploy') {
        	// If Deploy failed, clear post deploy tasks
        	if (self::$deployStatus == self::FAILED) {
        		$tasksToRun = array();
        	}

        	// Change Branch Back
        	if ($config->deployment('scm', false)) {
        		array_unshift($tasksToRun, 'scm/change-branch');
        		$config->addParameter('_changeBranchRevert');
        	}

        	// Remove Remote Source
        	if (is_array($config->deployment('source', null))) {
        		 array_push($tasksToRun, 'scm/remove-clone');
            }
        }

        if (count($tasksToRun) == 0) {
            Console::output('<dark_gray>No </dark_gray><light_cyan>' . $title . '</light_cyan> <dark_gray>tasks defined.</dark_gray>', 1, 3);

        } else {
            Console::output('Starting <dark_gray>' . $title . '</dark_gray> tasks:');

            $tasks = 0;
            $completedTasks = 0;

            foreach ($tasksToRun as $taskData) {
                $tasks++;
                $task = Factory::get($taskData, $config, false, $stage);

                if ($this->runTask($task)) {
                    $completedTasks++;
                } else {
                	self::$failedTasks++;
                }
            }

            if ($completedTasks == $tasks) {
                $tasksColor = 'green';
            } else {
                $tasksColor = 'red';
            }

            Console::output('Finished <dark_gray>' . $title . '</dark_gray> tasks: <' . $tasksColor . '>' . $completedTasks . '/' . $tasks . '</' . $tasksColor . '> tasks done.', 1, 3);
        }
    }

    protected function runDeploymentTasks()
    {
    	if (self::$deployStatus == self::FAILED) {
    		return;
    	}

    	// Run Tasks for Deployment
    	$hosts = $this->getConfig()->getHosts();
    	$this->hostsCount = count($hosts);
    	self::$failedTasks = 0;

    	if ($this->hostsCount == 0) {
    		Console::output('<light_purple>Warning!</light_purple> <dark_gray>No hosts defined, skipping deployment tasks.</dark_gray>', 1, 3);

    	} else {
    		$this->startTimeHosts = time();
    		foreach ($hosts as $hostKey => $host) {

    			// Check if Host has specific configuration
    			$hostConfig = null;
    			if (is_array($host)) {
    				$hostConfig = $host;
    				$host = $hostKey;
    			}

    			// Set Host and Host Specific Config
    			$this->getConfig()->setHost($host);
    			$this->getConfig()->setHostConfig($hostConfig);

    			// Prepare Tasks
    			$tasks = 0;
    			$completedTasks = 0;

    			Console::output('Deploying to <dark_gray>' . $this->getConfig()->getHost() . '</dark_gray>');

    			$tasksToRun = $this->getConfig()->getTasks();

    			// Guess a Deploy Strategy
    			switch ($this->getConfig()->deployment('strategy', 'guess')) {
    			    case 'rsync':
    			    	$deployStrategy = 'deployment/strategy/rsync';
    			    	break;

    			    case 'targz':
    			    	$deployStrategy = 'deployment/strategy/tar-gz';
    			    	break;

    			    case 'guess':
    			    default:
    			    	if ($this->getConfig()->release('enabled', false) == true) {
    			    		$deployStrategy = 'deployment/strategy/tar-gz';
    			    	} else {
    			    		$deployStrategy = 'deployment/strategy/rsync';
    			    	}
    			    	break;
    			}
    			array_unshift($tasksToRun, $deployStrategy);

    			if (count($tasksToRun) == 0) {
    				Console::output('<light_purple>Warning!</light_purple> <dark_gray>No </dark_gray><light_cyan>Deployment</light_cyan> <dark_gray>tasks defined.</dark_gray>', 2);
    				Console::output('Deployment to <dark_gray>' . $host . '</dark_gray> skipped!', 1, 3);

    			} else {
    				foreach ($tasksToRun as $taskData) {
    					$tasks++;
    					$task = Factory::get($taskData, $this->getConfig(), false, 'deploy');

    					if ($this->runTask($task)) {
    						$completedTasks++;
    					} else {
    						self::$failedTasks++;
    					}
    				}

    				if ($completedTasks == $tasks) {
    					$tasksColor = 'green';
    				} else {
    					$tasksColor = 'red';
    				}

    				Console::output('Deployment to <dark_gray>' . $this->getConfig()->getHost() . '</dark_gray> completed: <' . $tasksColor . '>' . $completedTasks . '/' . $tasks . '</' . $tasksColor . '> tasks done.', 1, 3);
    			}

    			// Reset Host Config
    			$this->getConfig()->setHostConfig(null);
    		}
    		$this->endTimeHosts = time();

    		if (self::$failedTasks > 0) {
    			self::$deployStatus = self::FAILED;
    		} else {
    			self::$deployStatus = self::SUCCEDED;
    		}

    		// Releasing
    		if (self::$deployStatus == self::SUCCEDED && $this->getConfig()->release('enabled', false) == true) {
    			// Execute the Releases
    			Console::output('Starting the <dark_gray>Releaseing</dark_gray>');
    			foreach ($hosts as $hostKey => $host) {

    				// Check if Host has specific configuration
    				$hostConfig = null;
    				if (is_array($host)) {
    					$hostConfig = $host;
    					$host = $hostKey;
    				}

    				// Set Host
    				$this->getConfig()->setHost($host);
    				$this->getConfig()->setHostConfig($hostConfig);

    				$task = Factory::get('deployment/release', $this->getConfig(), false, 'deploy');

    				if ($this->runTask($task, 'Releasing on host <purple>' . $host . '</purple> ... ')) {
    					$completedTasks++;
    				}

    				// Reset Host Config
    				$this->getConfig()->setHostConfig(null);
    			}
    			Console::output('Finished the <dark_gray>Releaseing</dark_gray>', 1, 3);

    			// Execute the Post-Release Tasks
    			foreach ($hosts as $hostKey => $host) {

    				// Check if Host has specific configuration
    				$hostConfig = null;
    				if (is_array($host)) {
    					$hostConfig = $host;
    					$host = $hostKey;
    				}

    				// Set Host
    				$this->getConfig()->setHost($host);
    				$this->getConfig()->setHostConfig($hostConfig);

    				$tasksToRun = $this->getConfig()->getTasks('post-release');
    				$tasks = count($tasksToRun);
    				$completedTasks = 0;

    				if (count($tasksToRun) > 0) {
    					Console::output('Starting <dark_gray>Post-Release</dark_gray> tasks for <dark_gray>' . $host . '</dark_gray>:');

    					foreach ($tasksToRun as $task) {
    						$task = Factory::get($task, $this->getConfig(), false, 'post-release');

    						if ($this->runTask($task)) {
    							$completedTasks++;
    						}
    					}

    					if ($completedTasks == $tasks) {
    						$tasksColor = 'green';
    					} else {
    						$tasksColor = 'red';
    					}
    					Console::output('Finished <dark_gray>Post-Release</dark_gray> tasks for <dark_gray>' . $host . '</dark_gray>: <' . $tasksColor . '>' . $completedTasks . '/' . $tasks . '</' . $tasksColor . '> tasks done.', 1, 3);
    				}

    				// Reset Host Config
    				$this->getConfig()->setHostConfig(null);
    			}
    		}
    	}
    }

    /**
     * Runs a Task
     *
     * @param string $task
     * @param string $title
     * @return boolean
     */
    protected function runTask($task, $title = null)
    {
        $task->init();

        if ($title == null) {
            $title = 'Running <purple>' . $task->getName() . '</purple> ... ';
        }
        Console::output($title, 2, 0);

        $runTask = true;
        if (($task instanceOf SkipOnOverride) && $this->getConfig()->getParameter('overrideRelease', false)) {
            $runTask == false;
        }

        $result = false;
        if ($runTask == true) {
            try {
                $result = $task->run();

                if ($result == true) {
                    Console::output('<green>OK</green>', 0);
                    $result = true;

                } else {
                    Console::output('<red>FAIL</red>', 0);
                    $result = false;
                }
            } catch (ErrorWithMessageException $e) {
            	Console::output('<red>FAIL</red> [Message: ' . $e->getMessage() . ']', 0);
            	$result = false;

            } catch (SkipException $e) {
                Console::output('<yellow>SKIPPED</yellow>', 0);
                $result = true;

            } catch (Exception $e) {
                Console::output('<red>FAIL</red>', 0);
                $result = false;
            }
        } else {
            Console::output('<yellow>SKIPPED</yellow>', 0);
            $result = true;
        }

        return $result;
    }

    /**
     * Humanize Transcurred time
     *
     * @param integer $time
     * @return string
     */
    protected function transcurredTime($time)
    {
        $hours = floor($time / 3600);
        $minutes = floor(($time - ($hours * 3600)) / 60);
        $seconds = $time - ($minutes * 60) - ($hours * 3600);
        $timeText = array();

        if ($hours > 0) {
            $timeText[] = $hours . ' hours';
        }

        if ($minutes > 0) {
            $timeText[] = $minutes . ' minutes';
        }

        if ($seconds >= 0) {
            $timeText[] = $seconds . ' seconds';
        }

        return implode(' ', $timeText);
    }

    /**
     * Send Email Notification if enabled
     */
    protected function sendNotification()
    {
    	$projectName = $this->getConfig()->general('name', false);
    	$projectEmail = $this->getConfig()->general('email', false);
    	$notificationsEnabled = $this->getConfig()->general('notifications', false);

    	// We need notifications enabled, and a project name and email to send the notification
        if (!$projectName || !$projectEmail || !$notificationsEnabled) {
            return false;
        }
    }

}