<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * This file is part of the PEAR2\Console\CommandLine package.
 *
 * PHP version 5
 *
 * LICENSE: This source file is subject to the MIT license that is available
 * through the world-wide-web at the following URI:
 * http://opensource.org/licenses/mit-license.php
 *
 * @category  Console
 * @package   PEAR2\Console\CommandLine
 * @author    David JEAN LOUIS <izimobil@gmail.com>
 * @copyright 2007-2009 David JEAN LOUIS
 * @license   http://opensource.org/licenses/mit-license.php MIT License
 * @version   GIT: $Id$
 * @link      http://pear2.php.net/PEAR2_Console_CommandLine
 * @since     File available since release 0.1.0
 * @filesource
 */

namespace PEAR2\Console\CommandLine;

/**
 * Lightweight class that manages messages used by PEAR2\Console\CommandLine package,
 * allowing the developper to customize these messages, for example to
 * internationalize a command line frontend.
 *
 * @category  Console
 * @package   PEAR2\Console\CommandLine
 * @author    David JEAN LOUIS <izimobil@gmail.com>
 * @copyright 2007-2009 David JEAN LOUIS
 * @license   http://opensource.org/licenses/mit-license.php MIT License
 * @link      http://pear2.php.net/PEAR2_Console_CommandLine
 * @since     Class available since release 0.1.0
 */
class MessageProvider_Default
    implements MessageProvider,
    CustomMessageProvider
{
    // Properties {{{

    /**
     * Associative array of messages
     *
     * @var array $messages
     */
    protected $messages = array(
        'OPTION_VALUE_REQUIRED'   => 'Option "{$name}" requires a value.',
        'OPTION_VALUE_UNEXPECTED' => 'Option "{$name}" does not expect a value (got "{$value}").',
        'OPTION_VALUE_NOT_VALID'  => 'Option "{$name}" must be one of the following: "{$choices}" (got "{$value}").',
        'OPTION_VALUE_TYPE_ERROR' => 'Option "{$name}" requires a value of type {$type} (got "{$value}").',
        'OPTION_AMBIGUOUS'        => 'Ambiguous option "{$name}", can be one of the following: {$matches}.',
        'OPTION_UNKNOWN'          => 'Unknown option "{$name}".',
        'ARGUMENT_REQUIRED'       => 'You must provide at least {$argnum} argument{$plural}.',
        'PROG_HELP_LINE'          => 'Type "{$progname} --help" to get help.',
        'PROG_VERSION_LINE'       => '{$progname} version {$version}.',
        'COMMAND_HELP_LINE'       => 'Type "{$progname} <command> --help" to get help on specific command.',
        'USAGE_WORD'              => 'Usage',
        'OPTION_WORD'             => 'Options',
        'ARGUMENT_WORD'           => 'Arguments',
        'COMMAND_WORD'            => 'Commands',
        'PASSWORD_PROMPT'         => 'Password: ',
        'PASSWORD_PROMPT_ECHO'    => 'Password (warning: will echo): ',
        'INVALID_CUSTOM_INSTANCE' => 'Instance does not implement the required interface',
        'LIST_OPTION_MESSAGE'     => 'lists valid choices for option {$name}',
        'LIST_DISPLAYED_MESSAGE'  => 'Valid choices are: ',
        'INVALID_SUBCOMMAND'      => 'Command "{$command}" is not valid.',
        'SUBCOMMAND_REQUIRED'     => 'Please enter one of the following command: {$commands}.',
    );

    // }}}
    // get() {{{

    /**
     * Retrieve the given string identifier corresponding message.
     *
     * @param string $code The string identifier of the message
     * @param array  $vars An array of template variables
     *
     * @return string
     */
    public function get($code, $vars = array())
    {
        if (!isset($this->messages[$code])) {
            return 'UNKNOWN';
        }
        return $this->replaceTemplateVars($this->messages[$code], $vars);
    }

    // }}}
    // getWithCustomMessages() {{{

    /**
     * Retrieve the given string identifier corresponding message.
     *
     * @param string $code     The string identifier of the message
     * @param array  $vars     An array of template variables
     * @param array  $messages An optional array of messages to use. Array
     *                         indexes are message codes.
     *
     * @return string
     */
    public function getWithCustomMessages(
        $code, $vars = array(), $messages = array()
    ) {
        // get message
        if (isset($messages[$code])) {
            $message = $messages[$code];
        } elseif (isset($this->messages[$code])) {
            $message = $this->messages[$code];
        } else {
            $message = 'UNKNOWN';
        }
        return $this->replaceTemplateVars($message, $vars);
    }

    // }}}
    // replaceTemplateVars() {{{

    /**
     * Replaces template vars in a message
     *
     * @param string $message The message
     * @param array  $vars    An array of template variables
     *
     * @return string
     */
    protected function replaceTemplateVars($message, $vars = array())
    {
        $tmpkeys = array_keys($vars);
        $keys    = array();
        foreach ($tmpkeys as $key) {
            $keys[] = '{$' . $key . '}';
        }
        return str_replace($keys, array_values($vars), $message);
    }

    // }}}
}
