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<?php
/**
* Schema database management for CakePHP.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://www.cakephp.org)
* Copyright 2005-2009, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2009, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.model
* @since CakePHP(tm) v 1.2.0.5550
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
App::import('Core', array('Model', 'ConnectionManager'));

/**
* Base Class for Schema management
*
* @package cake
* @subpackage cake.cake.libs.model
*/
class CakeSchema extends Object {

/**
* Name of the App Schema
*
* @var string
* @access public
*/
var $name = null;

/**
* Path to write location
*
* @var string
* @access public
*/
var $path = null;

/**
* File to write
*
* @var string
* @access public
*/
var $file = 'schema.php';

/**
* Connection used for read
*
* @var string
* @access public
*/
var $connection = 'default';

/**
* plugin name.
*
* @var string
**/
var $plugin = null;

/**
* Set of tables
*
* @var array
* @access public
*/
var $tables = array();

/**
* Constructor
*
* @param array $options optional load object properties
*/
function __construct($options = array()) {
parent::__construct();

if (empty($options['name'])) {
$this->name = preg_replace('/schema$/i', '', get_class($this));
}
if (!empty($options['plugin'])) {
$this->plugin = $options['plugin'];
}

if (strtolower($this->name) === 'cake') {
$this->name = Inflector::camelize(Inflector::slug(Configure::read('App.dir')));
}

if (empty($options['path'])) {
if (is_dir(CONFIGS . 'schema')) {
$this->path = CONFIGS . 'schema';
} else {
$this->path = CONFIGS . 'sql';
}
}

$options = array_merge(get_object_vars($this), $options);
$this->_build($options);
}

/**
* Builds schema object properties
*
* @param array $data loaded object properties
* @return void
* @access protected
*/
function _build($data) {
$file = null;
foreach ($data as $key => $val) {
if (!empty($val)) {
if (!in_array($key, array('plugin', 'name', 'path', 'file', 'connection', 'tables', '_log'))) {
$this->tables[$key] = $val;
unset($this->{$key});
} elseif ($key !== 'tables') {
if ($key === 'name' && $val !== $this->name && !isset($data['file'])) {
$file = Inflector::underscore($val) . '.php';
}
$this->{$key} = $val;
}
}
}
if (file_exists($this->path . DS . $file) && is_file($this->path . DS . $file)) {
$this->file = $file;
} elseif (!empty($this->plugin)) {
$this->path = App::pluginPath($this->plugin) . 'config' . DS . 'schema';
}
}

/**
* Before callback to be implemented in subclasses
*
* @param array $events schema object properties
* @return boolean Should process continue
* @access public
*/
function before($event = array()) {
return true;
}

/**
* After callback to be implemented in subclasses
*
* @param array $events schema object properties
* @access public
*/
function after($event = array()) {
}

/**
* Reads database and creates schema tables
*
* @param array $options schema object properties
* @return array Set of name and tables
* @access public
*/
function load($options = array()) {
if (is_string($options)) {
$options = array('path' => $options);
}

$this->_build($options);
extract(get_object_vars($this));

$class = $name .'Schema';

if (!class_exists($class)) {
if (file_exists($path . DS . $file) && is_file($path . DS . $file)) {
require_once($path . DS . $file);
} elseif (file_exists($path . DS . 'schema.php') && is_file($path . DS . 'schema.php')) {
require_once($path . DS . 'schema.php');
}
}

if (class_exists($class)) {
$Schema =& new $class($options);
return $Schema;
}

return false;
}

/**
* Reads database and creates schema tables
*
* Options
*
* - 'connection' - the db connection to use
* - 'name' - name of the schema
* - 'models' - a list of models to use, or false to ignore models
*
* @param array $options schema object properties
* @return array Array indexed by name and tables
* @access public
*/
function read($options = array()) {
extract(array_merge(
array(
'connection' => $this->connection,
'name' => $this->name,
'models' => true,
),
$options
));
$db =& ConnectionManager::getDataSource($connection);

App::import('Model', 'AppModel');
if (isset($this->plugin)) {
App::import('Model', Inflector::camelize($this->plugin) . 'AppModel');
}

$tables = array();
$currentTables = $db->listSources();

$prefix = null;
if (isset($db->config['prefix'])) {
$prefix = $db->config['prefix'];
}

if (!is_array($models) && $models !== false) {
if (isset($this->plugin)) {
$models = App::objects('model', App::pluginPath($this->plugin) . 'models' . DS, false);
} else {
$models = App::objects('model');
}
}

if (is_array($models)) {
foreach ($models as $model) {
if (isset($this->plugin)) {
$model = $this->plugin . '.' . $model;
}
if (PHP5) {
$Object = ClassRegistry::init(array('class' => $model, 'ds' => $connection));
} else {
$Object =& ClassRegistry::init(array('class' => $model, 'ds' => $connection));
}

if (is_object($Object) && $Object->useTable !== false) {
$Object->setDataSource($connection);
$table = $db->fullTableName($Object->useTable, false);

if (in_array($table, $currentTables)) {
$key = array_search($table, $currentTables);
if (empty($tables[$Object->table])) {
$tables[$Object->table] = $this->__columns($Object);
$tables[$Object->table]['indexes'] = $db->index($Object);
$tables[$Object->table]['tableParameters'] = $db->readTableParameters($table);
unset($currentTables[$key]);
}
if (!empty($Object->hasAndBelongsToMany)) {
foreach ($Object->hasAndBelongsToMany as $Assoc => $assocData) {
if (isset($assocData['with'])) {
$class = $assocData['with'];
}
if (is_object($Object->$class)) {
$table = $db->fullTableName($Object->$class, false);
if (in_array($table, $currentTables)) {
$key = array_search($table, $currentTables);
$tables[$Object->$class->table] = $this->__columns($Object->$class);
$tables[$Object->$class->table]['indexes'] = $db->index($Object->$class);
$tables[$Object->$class->table]['tableParameters'] = $db->readTableParameters($table);
unset($currentTables[$key]);
}
}
}
}
}
}
}
}

if (!empty($currentTables)) {
foreach ($currentTables as $table) {
if ($prefix) {
if (strpos($table, $prefix) !== 0) {
continue;
}
$table = str_replace($prefix, '', $table);
}
$Object = new AppModel(array(
'name' => Inflector::classify($table), 'table' => $table, 'ds' => $connection
));

$systemTables = array(
'aros', 'acos', 'aros_acos', Configure::read('Session.table'), 'i18n'
);

if (in_array($table, $systemTables)) {
$tables[$Object->table] = $this->__columns($Object);
$tables[$Object->table]['indexes'] = $db->index($Object);
$tables[$Object->table]['tableParameters'] = $db->readTableParameters($table);
} elseif ($models === false) {
$tables[$table] = $this->__columns($Object);
$tables[$table]['indexes'] = $db->index($Object);
$tables[$table]['tableParameters'] = $db->readTableParameters($table);
} else {
$tables['missing'][$table] = $this->__columns($Object);
$tables['missing'][$table]['indexes'] = $db->index($Object);
$tables['missing'][$table]['tableParameters'] = $db->readTableParameters($table);
}
}
}

ksort($tables);
return compact('name', 'tables');
}

/**
* Writes schema file from object or options
*
* @param mixed $object schema object or options array
* @param array $options schema object properties to override object
* @return mixed false or string written to file
* @access public
*/
function write($object, $options = array()) {
if (is_object($object)) {
$object = get_object_vars($object);
$this->_build($object);
}

if (is_array($object)) {
$options = $object;
unset($object);
}

extract(array_merge(
get_object_vars($this), $options
));

$out = "class {$name}Schema extends CakeSchema {\n";

$out .= "\tvar \$name = '{$name}';\n\n";

if ($path !== $this->path) {
$out .= "\tvar \$path = '{$path}';\n\n";
}

if ($file !== $this->file) {
$out .= "\tvar \$file = '{$file}';\n\n";
}

if ($connection !== 'default') {
$out .= "\tvar \$connection = '{$connection}';\n\n";
}

$out .= "\tfunction before(\$event = array()) {\n\t\treturn true;\n\t}\n\n\tfunction after(\$event = array()) {\n\t}\n\n";

if (empty($tables)) {
$this->read();
}

foreach ($tables as $table => $fields) {
if (!is_numeric($table) && $table !== 'missing') {
$out .= $this->generateTable($table, $fields);
}
}
$out .= "}\n";

$File =& new File($path . DS . $file, true);
$header = '$Id';
$content = "<?php \n/* SVN FILE: {$header}$ */\n/* {$name} schema generated on: " . date('Y-m-d H:m:s') . " : ". time() . "*/\n{$out}?>";
$content = $File->prepare($content);
if ($File->write($content)) {
return $content;
}
return false;
}

/**
* Generate the code for a table. Takes a table name and $fields array
* Returns a completed variable declaration to be used in schema classes
*
* @param string $table Table name you want returned.
* @param array $fields Array of field information to generate the table with.
* @return string Variable declaration for a schema class
**/
function generateTable($table, $fields) {
$out = "\tvar \${$table} = array(\n";
if (is_array($fields)) {
$cols = array();
foreach ($fields as $field => $value) {
if ($field != 'indexes' && $field != 'tableParameters') {
if (is_string($value)) {
$type = $value;
$value = array('type'=> $type);
}
$col = "\t\t'{$field}' => array('type' => '" . $value['type'] . "', ";
unset($value['type']);
$col .= join(', ', $this->__values($value));
} elseif ($field == 'indexes') {
$col = "\t\t'indexes' => array(";
$props = array();
foreach ((array)$value as $key => $index) {
$props[] = "'{$key}' => array(" . join(', ', $this->__values($index)) . ")";
}
$col .= join(', ', $props);
} elseif ($field == 'tableParameters') {
//@todo add charset, collate and engine here
$col = "\t\t'tableParameters' => array(";
$props = array();
foreach ((array)$value as $key => $param) {
$props[] = "'{$key}' => '$param'";
}
$col .= join(', ', $props);
}
$col .= ")";
$cols[] = $col;
}
$out .= join(",\n", $cols);
}
$out .= "\n\t);\n";
return $out;
}

/**
* Compares two sets of schemas
*
* @param mixed $old Schema object or array
* @param mixed $new Schema object or array
* @return array Tables (that are added, dropped, or changed)
* @access public
*/
function compare($old, $new = null) {
if (empty($new)) {
$new =& $this;
}
if (is_array($new)) {
if (isset($new['tables'])) {
$new = $new['tables'];
}
} else {
$new = $new->tables;
}

if (is_array($old)) {
if (isset($old['tables'])) {
$old = $old['tables'];
}
} else {
$old = $old->tables;
}
$tables = array();
foreach ($new as $table => $fields) {
if ($table == 'missing') {
break;
}
if (!array_key_exists($table, $old)) {
$tables[$table]['add'] = $fields;
} else {
$diff = array_diff_assoc($fields, $old[$table]);
if (!empty($diff)) {
$tables[$table]['add'] = $diff;
}
$diff = array_diff_assoc($old[$table], $fields);
if (!empty($diff)) {
$tables[$table]['drop'] = $diff;
}
}
foreach ($fields as $field => $value) {
if (isset($old[$table][$field])) {
$diff = array_diff_assoc($value, $old[$table][$field]);
if (!empty($diff) && $field !== 'indexes' && $field !== 'tableParameters') {
$tables[$table]['change'][$field] = array_merge($old[$table][$field], $diff);
}
}

if (isset($add[$table][$field])) {
$wrapper = array_keys($fields);
if ($column = array_search($field, $wrapper)) {
if (isset($wrapper[$column - 1])) {
$tables[$table]['add'][$field]['after'] = $wrapper[$column - 1];
}
}
}
}

if (isset($old[$table]['indexes']) && isset($new[$table]['indexes'])) {
$diff = $this->_compareIndexes($new[$table]['indexes'], $old[$table]['indexes']);
if ($diff) {
$tables[$table]['drop']['indexes'] = $diff['drop'];
$tables[$table]['add']['indexes'] = $diff['add'];
}
}
if (isset($old[$table]['tableParameters']) && isset($new[$table]['tableParameters'])) {
$diff = $this->_compareTableParameters($new[$table]['tableParameters'], $old[$table]['tableParameters']);
if ($diff) {
$tables[$table]['drop']['tableParameters'] = $diff['drop'];
$tables[$table]['add']['tableParameters'] = $diff['add'];
}
}
}
return $tables;
}

/**
* Formats Schema columns from Model Object
*
* @param array $values options keys(type, null, default, key, length, extra)
* @return array Formatted values
* @access public
*/
function __values($values) {
$vals = array();
if (is_array($values)) {
foreach ($values as $key => $val) {
if (is_array($val)) {
$vals[] = "'{$key}' => array('" . join("', '", $val) . "')";
} else if (!is_numeric($key)) {
$val = var_export($val, true);
$vals[] = "'{$key}' => {$val}";
}
}
}
return $vals;
}

/**
* Formats Schema columns from Model Object
*
* @param array $Obj model object
* @return array Formatted columns
* @access public
*/
function __columns(&$Obj) {
$db =& ConnectionManager::getDataSource($Obj->useDbConfig);
$fields = $Obj->schema(true);
$columns = $props = array();
foreach ($fields as $name => $value) {
if ($Obj->primaryKey == $name) {
$value['key'] = 'primary';
}
if (!isset($db->columns[$value['type']])) {
trigger_error('Schema generation error: invalid column type ' . $value['type'] . ' does not exist in DBO', E_USER_NOTICE);
continue;
} else {
$defaultCol = $db->columns[$value['type']];
if (isset($defaultCol['limit']) && $defaultCol['limit'] == $value['length']) {
unset($value['length']);
} elseif (isset($defaultCol['length']) && $defaultCol['length'] == $value['length']) {
unset($value['length']);
}
unset($value['limit']);
}

if (isset($value['default']) && ($value['default'] === '' || $value['default'] === false)) {
unset($value['default']);
}
if (empty($value['length'])) {
unset($value['length']);
}
if (empty($value['key'])) {
unset($value['key']);
}
$columns[$name] = $value;
}

return $columns;
}

/**
* Compare two schema files table Parameters
*
* @param array $new New indexes
* @param array $old Old indexes
* @return mixed False on failure, or an array of parameters to add & drop.
**/
function _compareTableParameters($new, $old) {

}

/**
* Compare two schema indexes
*
* @param array $new New indexes
* @param array $old Old indexes
* @return mixed false on failure or array of indexes to add and drop
*/
function _compareIndexes($new, $old) {
if (!is_array($new) || !is_array($old)) {
return false;
}

$add = $drop = array();

$diff = array_diff_assoc($new, $old);
if (!empty($diff)) {
$add = $diff;
}

$diff = array_diff_assoc($old, $new);
if (!empty($diff)) {
$drop = $diff;
}

foreach ($new as $name => $value) {
if (isset($old[$name])) {
$newUnique = isset($value['unique']) ? $value['unique'] : 0;
$oldUnique = isset($old[$name]['unique']) ? $old[$name]['unique'] : 0;
$newColumn = $value['column'];
$oldColumn = $old[$name]['column'];

$diff = false;

if ($newUnique != $oldUnique) {
$diff = true;
} elseif (is_array($newColumn) && is_array($oldColumn)) {
$diff = ($newColumn !== $oldColumn);
} elseif (is_string($newColumn) && is_string($oldColumn)) {
$diff = ($newColumn != $oldColumn);
} else {
$diff = true;
}
if ($diff) {
$drop[$name] = null;
$add[$name] = $value;
}
}
}
return array_filter(compact('add', 'drop'));
}
}
?>
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