<?php

/*
Copyright 2016-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.

Licensed under the GNU General Public License as published by the Free Software Foundation,
Version 2.0 (the "License"). You may not use this file except in compliance with the License.
A copy of the License is located in the "license" file accompanying this file.

This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
either express or implied. See the License for the specific language governing permissions
and limitations under the License.
*/
namespace AmazonAssociatesLinkBuilder\view\sidebar_partials;

use AmazonAssociatesLinkBuilder\constants\Db_Constants;
use AmazonAssociatesLinkBuilder\constants\Library_Endpoints;
use AmazonAssociatesLinkBuilder\constants\Plugin_Constants;
use AmazonAssociatesLinkBuilder\helper\Plugin_Helper;

include 'admin_ui_common.php';
$helper = new Plugin_Helper();
$helper->aalb_initialize_wp_filesystem_api();
//ToDO: Move below functions to into a helper class.
/**
 * Verifies whether file exists and is writable
 *
 * @since 1.0.0
 *
 * @param string $file Name of the file
 *
 * @return bool TRUE if file exists and is writable or if it's a new file which, throws exception otherwise
 */
function aalb_verify_file_is_writable( $file ) {
    if ( is_file( $file ) and ! is_writable( $file ) ) {
        /* translators: %s for fileName */
        throw new \Exception( sprintf( esc_html__( "Save Failed. The existing file %s is not writable.", 'amazon-associates-link-builder' ), $file ) );
    }

    return true;
}

/**
 * Writes content to a file
 *
 * @since 1.0.0
 *
 * @param string $file    Name of the file
 * @param string $content Content to be written
 *
 * @return bool  TRUE if write was successful, throws exception otherwise
 */
function aalb_write_to_file( $file, $content ) {
    global $wp_filesystem;
    if ( $wp_filesystem->put_contents( $file, $content ) === false ) {
        /* translators: %s for fileName */
        throw new \Exception( sprintf( esc_html__( "Save Failed. Error writing contents to file: %s", 'amazon-associates-link-builder' ), $file ) );
    }

    return true;
}

/**
 * Saves new or updates existing template.
 * Writes template CSS and HTML into files.
 *
 * @since 1.0.0
 *
 * @param string $file         Name of the file without .extension
 * @param string $content_html HTML content to be saved
 * @param string $content_css  CSS content to be saved
 */
function aalb_save_template( $file, $content_html, $content_css ) {
    $file_mustache = $file . ".mustache";
    $file_css = $file . ".css";
    try {
        if ( ( aalb_verify_file_is_writable( $file_css ) and aalb_verify_file_is_writable( $file_mustache ) ) ) {
            //Both files are (existing and writable) or (a new file is specified)
            if ( aalb_write_to_file( $file_mustache, $content_html ) and aalb_write_to_file( $file_css, $content_css ) ) {
                //Both files were saved successfully
                //Else case never occurs as an exception is thrown in false case
                $saveFailed = false;
                aalb_success_notice( esc_html__( "Template Saved Successfully", 'amazon-associates-link-builder' ) );
            }
        }
    } catch ( \Exception $e ) {
        throw new \Exception( $e->getMessage() );
    }
}

/**
 * Finds any change in the current list of templates.
 * Flags a note if either a template is added or removed.
 *
 * @since 1.3
 *
 * @param array $aalb_current_template_names Current list of templates
 * @param array $aalb_template_names         Refreshed list of templates
 */
function aalb_find_template_change( $aalb_current_template_names, $aalb_template_names ) {
    $templates_added = array_diff( $aalb_template_names, $aalb_current_template_names );
    $templates_deleted = array_diff( $aalb_current_template_names, $aalb_template_names );
    if ( sizeof( $templates_added ) > 0 ) {
        /* translators: 1: Number of templates 2: Name of added templates */
        aalb_info_notice( sprintf( esc_html__( "%1s template(s) added: %2s", 'amazon-associates-link-builder' ), sizeof( $templates_added ), implode( ', ', $templates_added ) ) );
    }
    if ( sizeof( $templates_deleted ) > 0 ) {
        /* translators: 1: Number of templates 2: Name of deleted templates */
        aalb_info_notice( sprintf( esc_html__( "%1s template(s) deleted: %2s", 'amazon-associates-link-builder' ), sizeof( $templates_deleted ), implode( ', ', $templates_deleted ) ) );
    }
}

//Flag to check if the save is failed.
$saveFailed = false;
$aalb_default_templates = explode( ",", Plugin_Constants::AMAZON_TEMPLATE_NAMES );

$aalb_current_template_names = get_option( Db_Constants::TEMPLATE_NAMES );

//Refresh templates
$helper->refresh_template_list();

$aalb_template_names = get_option( Db_Constants::TEMPLATE_NAMES );
aalb_find_template_change( $aalb_current_template_names, $aalb_template_names );

//ToDO: Make single submit button & move logic for save & remove to separate controllers for HTTP verbs instead of putting along with view
if ( isset ( $_POST["save"] ) || isset ( $_POST["remove"] ) ) {
    $aalb_template_name = stripslashes( $_POST["aalb_template_name"] );
    $aalb_template_template_html_box = stripslashes( $_POST["aalb_template_template_html_box"] );
    $aalb_template_template_css_box = stripslashes( $_POST["aalb_template_template_css_box"] );
    $dir = AALB_TEMPLATE_DIR;
    $aalb_template_upload_dir = $helper->get_template_upload_directory();
    if ( isset ( $_POST["save"] ) ) {
        if ( $_POST["aalb_template_list"] == "new" ) {
            if ( empty( $aalb_template_name ) ) {
                aalb_error_notice( esc_html__( "Please define the template name for the new template", 'amazon-associates-link-builder' ) );
            } elseif ( ! ctype_alnum( str_replace( array( '-', '_' ), '', $aalb_template_name ) ) ) {
                //The template name can only be alphanumeric characters plus hyphens (-) and underscores (_)
                aalb_error_notice( esc_html__( "Save Failed. Only alphanumeric characters allowed for template name.", 'amazon-associates-link-builder' ) );
            } else {
                if ( ! is_dir( $aalb_template_upload_dir ) or ! is_writable( $aalb_template_upload_dir ) ) {
                    /* translators: %s: Path of upload directory */
                    aalb_error_notice( sprintf( esc_html__( "Failed to create custom template. Please set up recursive Read-Write permissions for %s", 'amazon-associates-link-builder' ), $helper->aalb_get_uploads_dir_path() ) );
                } else {
                    //Check if template of that name already exists
                    if ( in_array( $aalb_template_name, $aalb_template_names ) ) {
                        /* translators: %s: Name of the template */
                        aalb_error_notice( sprintf( esc_html__( "Save Failed. A template with the name %s already exists. Please specify some other name for the template", 'amazon-associates-link-builder' ), $aalb_template_name ) );
                        //Ensures state is saved even on save failures
                        $saveFailed = true;
                    } else {
                        try {
                            aalb_save_template( $aalb_template_upload_dir . $aalb_template_name, $aalb_template_template_html_box, $aalb_template_template_css_box );
                            array_push( $aalb_template_names, $aalb_template_name );
                            update_option( 'aalb_template_names', $aalb_template_names );
                        } catch ( \Exception $e ) {
                            aalb_error_notice( $e->getMessage() );
                        }
                    }
                }
            }
        } else {
            try {
                if ( in_array( $aalb_template_name, $aalb_default_templates ) ) {
                    aalb_save_template( $dir . $aalb_template_name, $aalb_template_template_html_box, $aalb_template_template_css_box );
                } else {
                    aalb_save_template( $aalb_template_upload_dir . $aalb_template_name, $aalb_template_template_html_box, $aalb_template_template_css_box );
                }

                //clears the cached rendered templates whenever the template is modified
                $helper->clear_cache_for_template( $aalb_template_name );
            } catch ( \Exception $e ) {
                aalb_error_notice( $e->getMessage() );
            }
        }
    } elseif ( isset( $_POST["remove"] ) ) {
        if ( ! ( $_POST["aalb_template_list"] == "new" ) ) {
            if ( ! in_array( $aalb_template_name, $aalb_default_templates ) ) {
                $aalb_template_names = array_diff( $aalb_template_names, array( $aalb_template_name ) );
                update_option( 'aalb_template_names', $aalb_template_names );

                if ( unlink( $aalb_template_upload_dir . $aalb_template_name . ".mustache" ) ) {
                    aalb_success_notice( esc_html__( "Successfully removed Template HTML", 'amazon-associates-link-builder' ) );
                } else {
                    /* translators: %s: Name of the template along with absolute file path */
                    aalb_error_notice( sprintf( esc_html__( "Couldn't remove Template HTML. Please manually remove %s", 'amazon-associates-link-builder' ), $dir . $aalb_template_name . '.mustache' ) );
                }
                if ( unlink( $aalb_template_upload_dir . $aalb_template_name . ".css" ) ) {
                    aalb_success_notice( esc_html__( "Successfully removed Template CSS", 'amazon-associates-link-builder' ) );
                } else {
                    /* translators: %s: Name of the template along with complete path */
                    aalb_error_notice( sprintf( esc_html__( "Couldn't remove Template CSS. Please manually remove %s", 'amazon-associates-link-builder' ), $dir . $aalb_template_name . '.css' ) );
                }
                $aalb_template_name = "";
                $aalb_template_template_html_box = "";
                $aalb_template_template_css_box = "";
            } else {
                aalb_error_notice( esc_html__( "Couldn't remove Default Template", 'amazon-associates-link-builder' ) );
            }
        } else {
            aalb_error_notice( esc_html__( "Cannot remove new template. Please select a valid template to remove.", 'amazon-associates-link-builder' ) );
        }
    } else {
        error_log( "Error! Neither save nor remove is set on form submit" );
    }
}

wp_enqueue_script( 'jquery' );
wp_enqueue_script( 'codemirror_js', Library_Endpoints::CODEMIRROR_JS );
wp_enqueue_script( 'codemirror_mode_xml_js', Library_Endpoints::CODEMIRROR_MODE_XML_JS );
wp_enqueue_script( 'codemirror_mode_css_js', Library_Endpoints::CODEMIRROR_MODE_CSS_JS );
wp_enqueue_style( 'codemirror_css', Library_Endpoints::CODEMIRROR_CSS );

wp_enqueue_script( 'aalb_template_js', AALB_TEMPLATE_JS, array( 'jquery', 'codemirror_js', 'codemirror_mode_xml_js', 'codemirror_mode_css_js' ), Plugin_Constants::PLUGIN_CURRENT_VERSION );
wp_localize_script( 'aalb_template_js', 'wp_opt', array( 'ajax_url' => admin_url( 'admin-ajax.php' ), 'upload_url' => $helper->get_template_upload_directory(), 'plugin_url' => AALB_PLUGIN_URL, 'aalb_default_templates' => Plugin_Constants::AMAZON_TEMPLATE_NAMES ) );

?>
<div class="wrap">
    <h2><?php esc_html_e( "Templates for Associates Link Builder", 'amazon-associates-link-builder' ) ?></h2>
    <br>
    <form method="post">
        <table class="widefat fixed">
            <tr>
                <th scope="row" style="width:15%;"><?php esc_html_e( "Select Template", 'amazon-associates-link-builder' ) ?></th>
                <td>
                    <select id="aalb_template_list_select" name="aalb_template_list" style="width:50%"
                        onchange="aalb_template_select_template_onchange(this)">
                        <option value="new"><?php esc_html_e( "Create new template", 'amazon-associates-link-builder' ) ?></option>
                        <?php
                        foreach ( $aalb_template_names as $aalb_template ) {
                            ?>
                            <option value="<?= $aalb_template ?>" <?php $saveFailed === false ? selected( $aalb_template, ( isset( $aalb_template_name ) ) ? $aalb_template_name : '' ) : selected( $aalb_template, "" ) ?>><?= $aalb_template ?></option>
                            <?php
                        }
                        ?>
                    </select>
                    <input type="button" name="clone" id="clone_template" class="button button-secondary" value="<?php esc_attr_e( "Clone", 'amazon-associates-link-builder' ) ?>"
                        onclick="clone_existing_template()" disabled>
                </td>
            </tr>
            <tr>
                <th scope="row" style="width:15%;"><?php esc_html_e( "Set a name for your template", 'amazon-associates-link-builder' ) ?></th>
                <td>
                    <input type="text" id="aalb_template_name" name="aalb_template_name" style="width:50%"
                        value="<?= ( isset( $aalb_template_name ) ) ? $aalb_template_name : '' ?>" />
                    <span style="font-size:0.9em;">[<a
                            href="https://s3.amazonaws.com/aalb-public-resources/documents/AssociatesLinkBuilder-Guide-HowToCreateCustomTemplates.pdf"
                            target="_blank"><?php esc_html_e( "Guide for creating custom templates", 'amazon-associates-link-builder' ) ?></a>]</span>
                </td>
            </tr>
            <tr>
                <th scope="row" style="width:15%;"><?php esc_html_e( "Add HTML for your template", 'amazon-associates-link-builder' ) ?></th>
                <td><textarea id="aalb_template_template_html_box"
                        name="aalb_template_template_html_box"><?= ( isset( $aalb_template_template_html_box ) ) ? $aalb_template_template_html_box : '' ?></textarea>
                </td>
            </tr>
            <tr>
                <th scope="row" style="width:15%;"><?php esc_html_e( "Add CSS for your template", 'amazon-associates-link-builder' ) ?></th>
                <td><textarea id="aalb_template_template_css_box"
                        name="aalb_template_template_css_box"><?= ( isset( $aalb_template_template_css_box ) ) ? $aalb_template_template_css_box : '' ?></textarea>
                </td>
            </tr>
        </table>
        <p class="submit">
            <input name="save" id="submit_save" class="button button-primary" value="<?php esc_attr_e( "Save", 'amazon-associates-link-builder' ) ?>" type="submit">
            <input name="remove" id="submit_remove" class="button button-secondary" value="<?php esc_attr_e( "Remove", 'amazon-associates-link-builder' ) ?>" type="submit" disabled>
        </p>
    </form>
</div>