<?php

namespace app\common\library\ps;

use think\Config;

/**
 * Lodop 模式：测试环境只预览，生产可改为正式打印。
 */
class LodopPrinter
{
    /**
     * @return string preview|print
     */
    public static function mode()
    {
        $mode = Config::get('site.ps_lodop_mode') ?: (Config::get('ps.lodop.mode') ?: 'preview');
        return $mode === 'print' ? 'print' : 'preview';
    }

    /**
     * 下发给前端的 Lodop 调用包。多张流程单用 NEWPAGE 分页，copies 为整套重复次数。
     *
     * @param string $html  兼容单页
     * @param string $title
     * @param array  $pages [['html'=>..., 'title'=>...], ...]
     * @param int    $copies
     * @param array  $page  ['w'=>mm,'h'=>mm,'paper_size'=>'A4']
     * @return array
     */
    public static function buildTask($html, $title = '流程单', array $pages = [], $copies = 1, array $page = [])
    {
        $mode = self::mode();
        $copies = max(1, (int)$copies);
        if (!$pages) {
            $pages = [[
                'html'  => $html,
                'title' => $title,
            ]];
        }
        $first = $pages[0]['html'] ?? $html;
        $printTexts = [];
        foreach ($pages as $row) {
            if (!empty($row['print_items']) && is_array($row['print_items'])) {
                $printTexts[] = $row['print_items'];
            } elseif (!empty($row['items']) && is_array($row['items'])) {
                $printTexts[] = $row['items'];
            } else {
                $printTexts[] = [];
            }
        }
        return [
            'mode'        => $mode,
            'js_url'      => Config::get('site.ps_lodop_js') ?: (Config::get('ps.lodop.c_lodop_js') ?: 'http://localhost:8000/CLodopfuncs.js'),
            'title'       => $title,
            'html'        => $first,
            'pages'       => $pages,
            'print_texts' => $printTexts,
            'copies'      => $copies,
            'print_api'   => $mode === 'print' ? 'PRINT' : 'PREVIEW',
            'page'        => $page,
            'commands'    => self::commands($pages, $title, $copies, $mode, $page),
        ];
    }

    /**
     * 前端按顺序调用 CLODOP 的指令列表
     * @param array  $pages
     * @param string $title
     * @param int    $copies
     * @param string $mode
     * @param array  $page
     * @return array
     */
    protected static function commands(array $pages, $title, $copies, $mode, array $page = [])
    {
        $size = self::paperMm($page);
        $w = $size['w'];
        $h = $size['h'];
        $wMm = $w . 'mm';
        $hMm = $h . 'mm';
        $commands = [
            ['PRINT_INIT', $title],
            // 第四参数不要写 A4/A5：打印机没有该纸时会落到默认标签纸（常见 90×60、110×210）。
            ['SET_PRINT_PAGESIZE', 1, (int)round($w * 10), (int)round($h * 10), ''],
            ['SET_PRINT_MODE', 'POS_BASEON_PAPER', 1],
            ['SET_PRINT_COPIES', $copies],
            ['SET_PRINT_STYLE', 'FontName', '微软雅黑'],
            ['SET_PRINT_STYLE', 'FontSize', 10],
            ['SET_PRINT_STYLE', 'Bold', 0],
            ['SET_PRINT_STYLE', 'Italic', 0],
        ];
        $last = count($pages) - 1;
        foreach ($pages as $index => $item) {
            $texts = [];
            if (!empty($item['print_items']) && is_array($item['print_items'])) {
                $texts = $item['print_items'];
            } elseif (!empty($item['items']) && is_array($item['items'])) {
                $texts = $item['items'];
            }
            if ($texts) {
                foreach ($texts as $row) {
                    if (($row['type'] ?? '') === 'qrcode') {
                        $img = trim((string)($row['image'] ?? ''));
                        $qrTop = (string)($row['top'] ?? '0mm');
                        $qrLeft = (string)($row['left'] ?? '0mm');
                        $qrWidth = (string)($row['width'] ?? '24mm');
                        $qrHeight = (string)($row['height'] ?? '24mm');
                        if ($img !== '') {
                            $commands[] = [
                                'ADD_PRINT_IMAGE',
                                $qrTop,
                                $qrLeft,
                                $qrWidth,
                                $qrHeight,
                                $img,
                            ];
                            $commands[] = ['SET_PRINT_STYLEA', 0, 'Stretch', 1];
                        } else {
                            $commands[] = [
                                'ADD_PRINT_BARCODE',
                                $qrTop,
                                $qrLeft,
                                $qrWidth,
                                $qrHeight,
                                'QRCode',
                                (string)($row['text'] ?? ''),
                            ];
                            $commands[] = ['SET_PRINT_STYLEA', 0, 'QRCodeErrorLevel', 'L'];
                            $commands[] = ['SET_PRINT_STYLEA', 0, 'DataCharset', 'UTF-8'];
                        }
                        continue;
                    }
                    $commands[] = [
                        'ADD_PRINT_TEXT',
                        $row['top'],
                        $row['left'],
                        $row['width'],
                        $row['height'],
                        (string)($row['text'] ?? ''),
                    ];
                    $commands[] = ['SET_PRINT_STYLEA', 0, 'FontName', $row['font'] ?? '微软雅黑'];
                    $commands[] = ['SET_PRINT_STYLEA', 0, 'FontSize', (int)($row['size'] ?? 10)];
                    $commands[] = ['SET_PRINT_STYLEA', 0, 'Bold', !empty($row['bold']) ? 1 : 0];
                    $commands[] = ['SET_PRINT_STYLEA', 0, 'Italic', 0];
                    $commands[] = ['SET_PRINT_STYLEA', 0, 'Alignment', (int)($row['align'] ?? 1)];
                }
            } else {
                $html = self::stripCoverImage((string)($item['html'] ?? ''));
                $commands[] = ['ADD_PRINT_HTM', 0, 0, $wMm, $hMm, self::wrapHtml($html, $w, $h)];
            }
            if ($index < $last) {
                $commands[] = ['NEWPAGE'];
            }
        }
        $commands[] = [$mode === 'print' ? 'PRINT' : 'PREVIEW'];
        return $commands;
    }

    /**
     * 纸张毫米。始终带实数宽高，避免落到打印机默认标签纸。
     * @param array $page
     * @return array{w:float,h:float,paper_size:string}
     */
    protected static function paperMm(array $page)
    {
        $resolved = PaperSize::resolve(
            (string)($page['paper_size'] ?? ''),
            (float)($page['w'] ?? 0),
            (float)($page['h'] ?? 0)
        );
        return [
            'w'          => (float)$resolved['w'],
            'h'          => (float)$resolved['h'],
            'paper_size' => (string)$resolved['name'],
        ];
    }

    /**
     * @param string $html
     * @return string
     */
    protected static function stripCoverImage($html)
    {
        $html = preg_replace('/<img[^>]*alt="流程单底图"[^>]*>/i', '', (string)$html);
        return is_string($html) ? $html : '';
    }

    /**
     * @param string $html
     * @param float  $w
     * @param float  $h
     * @return string
     */
    protected static function wrapHtml($html, $w, $h)
    {
        return '<!DOCTYPE html><html><head><meta charset="utf-8">'
            . '<style>html,body{margin:0;padding:0;width:' . $w . 'mm;height:' . $h . 'mm;overflow:hidden;background:transparent;font-family:\'Microsoft YaHei\',\'微软雅黑\',sans-serif;font-size:13px;font-weight:normal;}</style>'
            . '</head><body>' . $html . '</body></html>';
    }
}