<?php
/**
 * This file is part of PHP Mess Detector.
 *
 * Copyright (c) Manuel Pichler <mapi@phpmd.org>.
 * All rights reserved.
 *
 * Licensed under BSD License
 * For full copyright and license information, please see the LICENSE file.
 * Redistributions of files must retain the above copyright notice.
 *
 * @author Manuel Pichler <mapi@phpmd.org>
 * @copyright Manuel Pichler. All rights reserved.
 * @license https://opensource.org/licenses/bsd-license.php BSD License
 * @link http://phpmd.org/
 */

namespace PHPMD;

use PHPMD\Node\ClassNode;

/**
 * This is the abstract base class for pmd rules.
 *
 * @SuppressWarnings(PHPMD)
 */
abstract class AbstractRule implements Rule
{
    /**
     * The name for this rule instance.
     *
     * @var string $_name
     */
    private $name = '';

    /**
     * The violation message text for this rule.
     *
     * @var string
     */
    private $message = '';

    /**
     * The version since when this rule is available.
     *
     * @var string
     */
    private $since = null;

    /**
     * An url will external information for this rule.
     *
     * @var string
     */
    private $externalInfoUrl = '';

    /**
     * An optional description for this rule.
     *
     * @var string
     */
    private $description = '';

    /**
     * A list of code examples for this rule.
     *
     * @var array(string)
     */
    private $examples = array();

    /**
     * The name of the parent rule-set instance.
     *
     * @var string
     */
    private $ruleSetName = '';

    /**
     * The priority of this rule.
     *
     * @var integer
     */
    private $priority = self::LOWEST_PRIORITY;

    /**
     * Configuration properties for this rule instance.
     *
     * @var array(string=>string)
     */
    private $properties = array();

    /**
     * The report for object for this rule.
     *
     * @var \PHPMD\Report
     */
    private $report = null;

    /**
     * Returns the name for this rule instance.
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Sets the name for this rule instance.
     *
     * @param string $name The rule name.
     * @return void
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    /**
     * Returns the version since when this rule is available or <b>null</b>.
     *
     * @return string
     */
    public function getSince()
    {
        return $this->since;
    }

    /**
     * Sets the version since when this rule is available.
     *
     * @param string $since The version number.
     * @return void
     */
    public function setSince($since)
    {
        $this->since = $since;
    }

    /**
     * Returns the violation message text for this rule.
     *
     * @return string
     */
    public function getMessage()
    {
        return $this->message;
    }

    /**
     * Sets the violation message text for this rule.
     *
     * @param string $message The violation message
     * @return void
     */
    public function setMessage($message)
    {
        $this->message = $message;
    }

    /**
     * Returns an url will external information for this rule.
     *
     * @return string
     */
    public function getExternalInfoUrl()
    {
        return $this->externalInfoUrl;
    }

    /**
     * Sets an url will external information for this rule.
     *
     * @param string $externalInfoUrl The info url.
     * @return void
     */
    public function setExternalInfoUrl($externalInfoUrl)
    {
        $this->externalInfoUrl = $externalInfoUrl;
    }

    /**
     * Returns the description text for this rule instance.
     *
     * @return string
     */
    public function getDescription()
    {
        return $this->description;
    }

    /**
     * Sets the description text for this rule instance.
     *
     * @param string $description The description text.
     * @return void
     */
    public function setDescription($description)
    {
        $this->description = $description;
    }

    /**
     * Returns a list of examples for this rule.
     *
     * @return string[]
     */
    public function getExamples()
    {
        return $this->examples;
    }

    /**
     * Adds a code example for this rule.
     *
     * @param string $example The code example.
     * @return void
     */
    public function addExample($example)
    {
        $this->examples[] = $example;
    }

    /**
     * Returns the priority of this rule.
     *
     * @return integer
     */
    public function getPriority()
    {
        return $this->priority;
    }

    /**
     * Set the priority of this rule.
     *
     * @param integer $priority The rule priority
     * @return void
     */
    public function setPriority($priority)
    {
        $this->priority = $priority;
    }

    /**
     * Returns the name of the parent rule-set instance.
     *
     * @return string
     */
    public function getRuleSetName()
    {
        return $this->ruleSetName;
    }

    /**
     * Sets the name of the parent rule set instance.
     *
     * @param string $ruleSetName The rule-set name.
     * @return void
     */
    public function setRuleSetName($ruleSetName)
    {
        $this->ruleSetName = $ruleSetName;
    }

    /**
     * Returns the violation report for this rule.
     *
     * @return \PHPMD\Report
     */
    public function getReport()
    {
        return $this->report;
    }

    /**
     * Sets the violation report for this rule.
     *
     * @param \PHPMD\Report $report
     * @return void
     */
    public function setReport(Report $report)
    {
        $this->report = $report;
    }

    /**
     * Adds a configuration property to this rule instance.
     *
     * @param string $name
     * @param string $value
     * @return void
     */
    public function addProperty($name, $value)
    {
        $this->properties[$name] = $value;
    }

    /**
     * Returns the value of a configured property
     *
     * Throws an exception when no property with <b>$name</b> exists
     * and no default value to fall back was given.
     *
     * @param string $name The name of the property, e.g. "ignore-whitespace".
     * @param mixed $default An optional default value to fall back instead of throwing an exception.
     * @return mixed The value of a configured property.
     * @throws \OutOfBoundsException When no property for <b>$name</b> exists and
     * no default value to fall back was given.
     */
    protected function getProperty($name, $default = null)
    {
        if (isset($this->properties[$name])) {
            return $this->properties[$name];
        }

        if ($default !== null) {
            return $default;
        }

        throw new \OutOfBoundsException('Property "' . $name . '" does not exist.');
    }

    /**
     * Returns the value of a configured property as a boolean
     *
     * Throws an exception when no property with <b>$name</b> exists
     * and no default value to fall back was given.
     *
     * @param string $name The name of the property, e.g. "ignore-whitespace".
     * @param bool $default An optional default value to fall back instead of throwing an exception.
     * @return bool The value of a configured property as a boolean.
     * @throws \OutOfBoundsException When no property for <b>$name</b> exists and
     * no default value to fall back was given.
     */
    public function getBooleanProperty($name, $default = null)
    {
        return in_array($this->getProperty($name, $default), array('true', 'on', 1), false);
    }

    /**
     * Returns the value of a configured property as an integer
     *
     * Throws an exception when no property with <b>$name</b> exists
     * and no default value to fall back was given.
     *
     * @param string $name The name of the property, e.g. "minimum".
     * @param int $default An optional default value to fall back instead of throwing an exception.
     * @return int The value of a configured property as an integer.
     * @throws \OutOfBoundsException When no property for <b>$name</b> exists and
     * no default value to fall back was given.
     */
    public function getIntProperty($name, $default = null)
    {
        return (int)$this->getProperty($name, $default);
    }

    /**
     * Returns the raw string value of a configured property
     *
     * Throws an exception when no property with <b>$name</b> exists
     * and no default value to fall back was given.
     *
     * @param string $name The name of the property, e.g. "exceptions".
     * @param string|null $default An optional default value to fall back instead of throwing an exception.
     * @return string The raw string value of a configured property.
     * @throws \OutOfBoundsException When no property for <b>$name</b> exists and
     * no default value to fall back was given.
     */
    public function getStringProperty($name, $default = null)
    {
        return (string)$this->getProperty($name, $default);
    }

    /**
     * This method adds a violation to all reports for this violation type and
     * for the given <b>$node</b> instance.
     *
     * @param \PHPMD\AbstractNode $node
     * @param array $args
     * @param mixed $metric
     * @return void
     */
    protected function addViolation(
        AbstractNode $node,
        array $args = array(),
        $metric = null
    ) {
        $search = array();
        $replace = array();
        foreach ($args as $index => $value) {
            $search[] = '{' . $index . '}';
            $replace[] = $value;
        }

        $message = str_replace($search, $replace, $this->message);

        $ruleViolation = new RuleViolation($this, $node, $message, $metric);
        $this->report->addRuleViolation($ruleViolation);
    }

    /**
     * Apply the current rule on each method of a class node.
     *
     * @param ClassNode $node class node containing methods.
     */
    protected function applyOnClassMethods(ClassNode $node)
    {
        foreach ($node->getMethods() as $method) {
            if ($method->hasSuppressWarningsAnnotationFor($this)) {
                continue;
            }

            $this->apply($method);
        }
    }

    /**
     * This method should implement the violation analysis algorithm of concrete
     * rule implementations. All extending classes must implement this method.
     *
     * @param \PHPMD\AbstractNode $node
     * @return void
     */
    abstract public function apply(AbstractNode $node);
}