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<?php
/**
 * Schema database management for CakePHP.
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       Cake.Model
 * @since         CakePHP(tm) v 1.2.0.5550
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

App::uses('Model', 'Model');
App::uses('AppModel', 'Model');
App::uses('ConnectionManager', 'Model');
App::uses('File', 'Utility');

/**
 * Base Class for Schema management
 *
 * @package       Cake.Model
 */
class CakeSchema extends Object {

/**
 * Name of the schema
 *
 * @var string
 */
        public $name = null;

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

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

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

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

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

/**
 * Constructor
 *
 * @param array $options optional load object properties
 */
        public function __construct($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'])) {
                        $this->path = APP . 'Config' . DS . 'Schema';
                }

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

/**
 * Builds schema object properties
 *
 * @param array $data loaded object properties
 * @return void
 */
        public function build($data) {
                $file = null;
                foreach ($data as $key => $val) {
                        if (!empty($val)) {
                                if (!in_array($key, array('plugin', 'name', 'path', 'file', 'connection', 'tables', '_log'))) {
                                        if ($key[0] === '_') {
                                                continue;
                                        }
                                        $this->tables[$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)) {
                        $this->path = CakePlugin::path($this->plugin) . 'Config' . DS . 'Schema';
                }
        }

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

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

/**
 * Reads database and creates schema tables
 *
 * @param array $options schema object properties
 * @return array Set of name and tables
 */
        public function load($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 $options schema object properties
 * @return array Array indexed by name and tables
 */
        public function read($options = array()) {
                extract(array_merge(
                        array(
                                'connection' => $this->connection,
                                'name' => $this->name,
                                'models' => true,
                        ),
                        $options
                ));
                $db = ConnectionManager::getDataSource($connection);

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

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

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

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

                if (is_array($models)) {
                        foreach ($models as $model) {
                                $importModel = $model;
                                $plugin = null;
                                if ($model === 'AppModel') {
                                        continue;
                                }

                                if (isset($this->plugin)) {
                                        if ($model === $this->plugin . 'AppModel') {
                                                continue;
                                        }
                                        $importModel = $model;
                                        $plugin = $this->plugin . '.';
                                }

                                App::uses($importModel, $plugin . 'Model');
                                if (!class_exists($importModel)) {
                                        continue;
                                }

                                $vars = get_class_vars($model);
                                if (empty($vars['useDbConfig']) || $vars['useDbConfig'] != $connection) {
                                        continue;
                                }

                                try {
                                        $Object = ClassRegistry::init(array('class' => $model, 'ds' => $connection));
                                } catch (CakeException $e) {
                                        continue;
                                }

                                if (!is_object($Object) || $Object->useTable === false) {
                                        continue;
                                }
                                $db = $Object->getDataSource();

                                $fulltable = $table = $db->fullTableName($Object, false, false);
                                if ($prefix && strpos($table, $prefix) !== 0) {
                                        continue;
                                }
                                if (!in_array($fulltable, $currentTables)) {
                                        continue;
                                }

                                $table = $this->_noPrefixTable($prefix, $table);

                                $key = array_search($fulltable, $currentTables);
                                if (empty($tables[$table])) {
                                        $tables[$table] = $this->_columns($Object);
                                        $tables[$table]['indexes'] = $db->index($Object);
                                        $tables[$table]['tableParameters'] = $db->readTableParameters($fulltable);
                                        unset($currentTables[$key]);
                                }
                                if (empty($Object->hasAndBelongsToMany)) {
                                        continue;
                                }
                                foreach ($Object->hasAndBelongsToMany as $assocData) {
                                        if (isset($assocData['with'])) {
                                                $class = $assocData['with'];
                                        }
                                        if (!is_object($Object->$class)) {
                                                continue;
                                        }
                                        $withTable = $db->fullTableName($Object->$class, false, false);
                                        if ($prefix && strpos($withTable, $prefix) !== 0) {
                                                continue;
                                        }
                                        if (in_array($withTable, $currentTables)) {
                                                $key = array_search($withTable, $currentTables);
                                                $noPrefixWith = $this->_noPrefixTable($prefix, $withTable);

                                                $tables[$noPrefixWith] = $this->_columns($Object->$class);
                                                $tables[$noPrefixWith]['indexes'] = $db->index($Object->$class);
                                                $tables[$noPrefixWith]['tableParameters'] = $db->readTableParameters($withTable);
                                                unset($currentTables[$key]);
                                        }
                                }
                        }
                }

                if (!empty($currentTables)) {
                        foreach ($currentTables as $table) {
                                if ($prefix) {
                                        if (strpos($table, $prefix) !== 0) {
                                                continue;
                                        }
                                        $table = $this->_noPrefixTable($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'
                                );

                                $fulltable = $db->fullTableName($Object, false, false);

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

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

/**
 * Writes schema file from object or options
 *
 * @param array|object $object schema object or options array
 * @param array $options schema object properties to override object
 * @return mixed false or string written to file
 */
        public function write($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\n";

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

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

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

                $out .= "\tpublic function before(\$event = array()) {\n\t\treturn true;\n\t}\n\n\tpublic function 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);
                $content = "<?php \n{$out}";
                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 $fields Array of field information to generate the table with.
 * @return string Variable declaration for a schema class
 */
        public function generateTable($table, $fields) {
                $out = "\tpublic \${$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 .= implode(', ', $this->_values($value));
                                } elseif ($field === 'indexes') {
                                        $col = "\t\t'indexes' => array(\n\t\t\t";
                                        $props = array();
                                        foreach ((array)$value as $key => $index) {
                                                $props[] = "'{$key}' => array(" . implode(', ', $this->_values($index)) . ")";
                                        }
                                        $col .= implode(",\n\t\t\t", $props) . "\n\t\t";
                                } elseif ($field === 'tableParameters') {
                                        $col = "\t\t'tableParameters' => array(";
                                        $props = array();
                                        foreach ((array)$value as $key => $param) {
                                                $props[] = "'{$key}' => '$param'";
                                        }
                                        $col .= implode(', ', $props);
                                }
                                $col .= ")";
                                $cols[] = $col;
                        }
                        $out .= implode(",\n", $cols);
                }
                $out .= "\n\t);\n\n";
                return $out;
        }

/**
 * Compares two sets of schemas
 *
 * @param array|object $old Schema object or array
 * @param array|object $new Schema object or array
 * @return array Tables (that are added, dropped, or changed)
 */
        public function compare($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') {
                                continue;
                        }
                        if (!array_key_exists($table, $old)) {
                                $tables[$table]['create'] = $fields;
                        } else {
                                $diff = $this->_arrayDiffAssoc($fields, $old[$table]);
                                if (!empty($diff)) {
                                        $tables[$table]['add'] = $diff;
                                }
                                $diff = $this->_arrayDiffAssoc($old[$table], $fields);
                                if (!empty($diff)) {
                                        $tables[$table]['drop'] = $diff;
                                }
                        }

                        foreach ($fields as $field => $value) {
                                if (!empty($old[$table][$field])) {
                                        $diff = $this->_arrayDiffAssoc($value, $old[$table][$field]);
                                        if (!empty($diff) && $field !== 'indexes' && $field !== 'tableParameters') {
                                                $tables[$table]['change'][$field] = $value;
                                        }
                                }

                                if (isset($tables[$table]['add'][$field]) && $field !== 'indexes' && $field !== 'tableParameters') {
                                        $wrapper = array_keys($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 ($diff) {
                                        if (!isset($tables[$table])) {
                                                $tables[$table] = array();
                                        }
                                        if (isset($diff['drop'])) {
                                                $tables[$table]['drop']['indexes'] = $diff['drop'];
                                        }
                                        if ($diff && isset($diff['add'])) {
                                                $tables[$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]['change']['tableParameters'] = $diff;
                                }
                        }
                }
                return $tables;
        }

/**
 * Extended array_diff_assoc noticing change from/to NULL values
 *
 * It behaves almost the same way as array_diff_assoc except for NULL values: if
 * one of the values is not NULL - change is detected. It is useful in situation
 * where one value is strval('') ant other is strval(null) - in string comparing
 * methods this results as EQUAL, while it is not.
 *
 * @param array $array1 Base array
 * @param array $array2 Corresponding array checked for equality
 * @return array Difference as array with array(keys => values) from input array
 *     where match was not found.
 */
        protected function _arrayDiffAssoc($array1, $array2) {
                $difference = array();
                foreach ($array1 as $key => $value) {
                        if (!array_key_exists($key, $array2)) {
                                $difference[$key] = $value;
                                continue;
                        }
                        $correspondingValue = $array2[$key];
                        if (($value === null) !== ($correspondingValue === null)) {
                                $difference[$key] = $value;
                                continue;
                        }
                        if (is_bool($value) !== is_bool($correspondingValue)) {
                                $difference[$key] = $value;
                                continue;
                        }
                        if (is_array($value) && is_array($correspondingValue)) {
                                continue;
                        }
                        if ($value === $correspondingValue) {
                                continue;
                        }
                        $difference[$key] = $value;
                }
                return $difference;
        }

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

/**
 * Formats Schema columns from Model Object
 *
 * @param array &$Obj model object
 * @return array Formatted columns
 */
        protected function _columns(&$Obj) {
                $db = $Obj->getDataSource();
                $fields = $Obj->schema(true);

                $columns = array();
                foreach ($fields as $name => $value) {
                        if ($Obj->primaryKey === $name) {
                                $value['key'] = 'primary';
                        }
                        if (!isset($db->columns[$value['type']])) {
                                trigger_error(__d('cake_dev', 'Schema generation error: invalid column type %s for %s.%s does not exist in DBO', $value['type'], $Obj->name, $name), 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 && $value['type'] !== 'boolean'))) {
                                unset($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 $old Old indexes
 * @return mixed False on failure, or an array of parameters to add & drop.
 */
        protected function _compareTableParameters($new, $old) {
                if (!is_array($new) || !is_array($old)) {
                        return false;
                }
                $change = $this->_arrayDiffAssoc($new, $old);
                return $change;
        }

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

                $add = $drop = array();

                $diff = $this->_arrayDiffAssoc($new, $old);
                if (!empty($diff)) {
                        $add = $diff;
                }

                $diff = $this->_arrayDiffAssoc($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'));
        }

/**
 * Trim the table prefix from the full table name, and return the prefix-less table
 *
 * @param string $prefix Table prefix
 * @param string $table Full table name
 * @return string Prefix-less table name
 */
        protected function _noPrefixTable($prefix, $table) {
                return preg_replace('/^' . preg_quote($prefix) . '/', '', $table);
        }

}