From 235266ec53f620d94a080ed7ae8e77eaef6dbb3c Mon Sep 17 00:00:00 2001
From: Igor Scheller <igor.scheller@igorshp.de>
Date: Tue, 16 Jan 2018 21:26:59 +0100
Subject: Added basic database migration functionality

---
 src/Database/Migration/Migrate.php | 192 +++++++++++++++++++++++++++++++++++++
 1 file changed, 192 insertions(+)
 create mode 100644 src/Database/Migration/Migrate.php

(limited to 'src/Database/Migration/Migrate.php')

diff --git a/src/Database/Migration/Migrate.php b/src/Database/Migration/Migrate.php
new file mode 100644
index 00000000..3a08bb6e
--- /dev/null
+++ b/src/Database/Migration/Migrate.php
@@ -0,0 +1,192 @@
+<?php
+
+namespace Engelsystem\Database\Migration;
+
+use Engelsystem\Application;
+use Illuminate\Database\Query\Builder;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder as SchemaBuilder;
+use Illuminate\Support\Collection;
+use Illuminate\Support\Str;
+
+class Migrate
+{
+    const UP = 'up';
+    const DOWN = 'down';
+
+    /** @var Application */
+    protected $app;
+
+    /** @var SchemaBuilder */
+    protected $scheme;
+
+    /** @var callable */
+    protected $output;
+
+    /** @var string */
+    protected $table = 'migrations';
+
+    /**
+     * Migrate constructor
+     *
+     * @param SchemaBuilder $scheme
+     * @param Application   $app
+     */
+    public function __construct(SchemaBuilder $scheme, Application $app)
+    {
+        $this->app = $app;
+        $this->scheme = $scheme;
+        $this->output = function () { };
+    }
+
+    /**
+     * Run a migration
+     *
+     * @param string $path
+     * @param string $type (up|down)
+     * @param bool   $oneStep
+     */
+    public function run($path, $type = self::UP, $oneStep = false)
+    {
+        $this->initMigration();
+        $migrations = $this->getMigrations($path);
+        $migrated = $this->getMigrated();
+
+        if ($type == self::DOWN) {
+            $migrations = array_reverse($migrations, true);
+        }
+
+        foreach ($migrations as $file => $migration) {
+            if (
+                ($type == self::UP && $migrated->contains('migration', $migration))
+                || ($type == self::DOWN && !$migrated->contains('migration', $migration))
+            ) {
+                call_user_func($this->output, 'Skipping ' . $migration);
+                continue;
+            }
+
+            call_user_func($this->output, 'Migrating ' . $migration . ' (' . $type . ')');
+
+            $this->migrate($file, $migration, $type);
+            $this->setMigrated($migration, $type);
+
+            if ($oneStep) {
+                return;
+            }
+        }
+    }
+
+    /**
+     * Get all migrated migrations
+     *
+     * @return Collection
+     */
+    protected function getMigrated()
+    {
+        return $this->getTableQuery()->get();
+    }
+
+    /**
+     * Migrate a migration
+     *
+     * @param string $file
+     * @param string $migration
+     * @param string $type (up|down)
+     */
+    protected function migrate($file, $migration, $type = self::UP)
+    {
+        require_once $file;
+
+        $className = Str::studly(preg_replace('/\d+_/', '', $migration));
+        /** @var Migration $class */
+        $class = $this->app->make($className);
+
+        if (method_exists($class, $type)) {
+            $class->{$type}();
+        }
+    }
+
+    /**
+     * Set a migration to migrated
+     *
+     * @param string $migration
+     * @param string $type (up|down)
+     */
+    protected function setMigrated($migration, $type = self::UP)
+    {
+        $table = $this->getTableQuery();
+
+        if ($type == self::DOWN) {
+            $table->where(['migration' => $migration])->delete();
+            return;
+        }
+
+        $table->insert(['migration' => $migration]);
+    }
+
+    /**
+     * Get a list of migration files
+     *
+     * @param string $dir
+     * @return array
+     */
+    protected function getMigrations($dir)
+    {
+        $files = $this->getMigrationFiles($dir);
+
+        $migrations = [];
+        foreach ($files as $dir) {
+            $name = str_replace('.php', '', basename($dir));
+            $migrations[$dir] = $name;
+        }
+
+        asort($migrations);
+        return $migrations;
+    }
+
+    /**
+     * List all migration files from the given directory
+     *
+     * @param string $dir
+     * @return array
+     */
+    protected function getMigrationFiles($dir)
+    {
+        return glob($dir . '/*_*.php');
+    }
+
+    /**
+     * Setup migration tables
+     */
+    protected function initMigration()
+    {
+        if ($this->scheme->hasTable($this->table)) {
+            return;
+        }
+
+        $this->scheme->create($this->table, function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('migration');
+        });
+    }
+
+    /**
+     * Init a table query
+     *
+     * @return Builder
+     */
+    protected function getTableQuery()
+    {
+        return $this->scheme->getConnection()->table($this->table);
+    }
+
+    /**
+     * Set the output function
+     *
+     * @param callable $output
+     */
+    public function setOutput(callable $output)
+    {
+        $this->output = $output;
+    }
+}
-- 
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