<?php

if (!defined('ABSPATH')) {
    exit;
}

class AdGhost_CSV_Exporter {

    const PLACEMENTS = [
        'header'         => 'ROS_ATF_Leaderboard',
        'incontent'      => 'In-Article_All',
        'before_content' => 'In-Article_All',
        'after_content'  => 'In-Article_All',
        'sidebar'        => 'ROS_Sticky_Sidebars',
        'footer'         => 'ROS_Pre-Footer_BTF',
        'anchor'         => 'ROS_Sticky_Footer',
        'interstitial'   => 'Special_Interstitial',
        'reward'         => 'Special_Reward',
    ];

    public static function generate($ad_units, $only_new = false) {
        $lines = [];
        $seen  = [];
        foreach ((array) $ad_units as $unit) {
            if (!is_array($unit) || ($only_new && self::in_gam($unit))) {
                continue;
            }
            $row = self::row($unit);
            if (isset($seen[$row[0]])) {
                continue;
            }
            $seen[$row[0]] = true;
            $lines[] = self::line($row);
        }
        return $lines ? implode("\n", $lines) . "\n" : '';
    }

    public static function in_gam(array $unit) {
        return !empty($unit['gam']['code'])
            && (string) $unit['gam']['code'] === AdGhost_Helper::gam_code(AdGhost_Helper::normalize_unit($unit));
    }

    public static function row(array $unit) {
        if (class_exists('AdGhost_Default_Ad_Units')) {
            $unit = AdGhost_Default_Ad_Units::fill_from_default($unit);
        }
        $unit     = AdGhost_Helper::normalize_unit($unit);
        $code     = AdGhost_Helper::gam_code($unit);
        $position = AdGhost_Helper::get_unit_position($unit);
        $special  = in_array($unit['type'], ['interstitial', 'reward'], true);

        $sizes = $special ? 'out-of-page' : implode(';', array_filter(array_map('trim', preg_split('/[;,]/', (string) ($unit['sizes'] ?? '')))));
        $name  = trim((string) ($unit['name'] ?? '')) !== '' ? $unit['name'] : $code;
        $placement = trim((string) ($unit['gamPlacement'] ?? ''));
        if ($placement === '') {
            $placement = self::PLACEMENTS[$position]
                ?? 'ROS_' . str_replace(' ', '_', ucwords(str_replace('_', ' ', $position)));
        }

        return [
            $code,
            preg_replace('/\s+/', '_', trim((string) $name)),
            $sizes,
            trim((string) ($unit['label'] ?? '')) !== '' ? $unit['label'] : $name,
            $placement,
            '_blank',
        ];
    }

    private static function line(array $cells) {
        return implode(',', array_map(function ($cell) {
            $cell = (string) $cell;
            return preg_match('/[",\r\n]/', $cell) ? '"' . str_replace('"', '""', $cell) . '"' : $cell;
        }, $cells));
    }

    public static function download() {
        check_ajax_referer('adghost_nonce', 'nonce');

        if (!current_user_can('manage_options')) {
            wp_die('Unauthorized');
        }

        $csv = self::generate(get_option('adghost_ad_units', []));
        if ($csv === '') {
            wp_die('No ad units to export');
        }

        header('Content-Type: text/csv; charset=utf-8');
        header('Content-Disposition: attachment; filename=adghost-ad-units-' . gmdate('Y-m-d') . '.csv');

        echo $csv; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- a CSV file download, not HTML.
        exit;
    }
}