huahuibao/common/components/PosterUtil.php

<?php

namespace common\components;

/**
 * 散客分享海报（OSS：poster/blank.png 动态画布 + 水印合成）
 */
class PosterUtil
{
    /** 与 poster/1234.jpg 同目录的 10×10 白底，经 m_pad 拉成本次海报画布 */
    const BLANK_CANVAS = 'poster/blank.png';

    const FONT = 'd3F5LW1pY3JvaGVp';

    const POSTER_W = 750;

    /** 画布左右留白（各 20px） */
    const CANVAS_PAD_X = 20;

    /** 商品图显示宽度 = POSTER_W - 2×CANVAS_PAD_X */
    const SLOT_W = 710;

    /** 底部价格/标题/太阳码固定区 */
    const FOOTER_H = 360;

    /** 主图区温和下限，避免扁图海报过矮 */
    const IMG_H_MIN = 240;

    const IMG_H_MAX = 880;

    const TOTAL_H_MAX = 1600;

    const CANVAS_COLOR = 'FFFFFF';

    const QR_SIZE = 220;

    const QR_PAD_RIGHT = 36;

    const QR_PAD_BOTTOM = 32;

    const QR_HINT_GAP = 14;

    const SCAN_HINT = '微信扫码下单';

    /**
     * 海报标题过长时截断，避免压住底部文案区
     */
    public static function truncateText($text, $maxLen = 14)
    {
        $text = trim((string)$text);
        if ($text === '') {
            return '';
        }
        if (mb_strlen($text, 'UTF-8') > $maxLen) {
            return mb_substr($text, 0, $maxLen, 'UTF-8') . '…';
        }
        return $text;
    }

    /**
     * 按商品图比例计算主图区高度与画布总高（能多矮就多矮，仅保留温和下限）
     *
     * @return array{imgH:int,totalH:int,scaledH:int,posterW:int}
     */
    public static function calcPosterLayout($coverWidth, $coverHeight)
    {
        $coverWidth = (int)$coverWidth;
        $coverHeight = (int)$coverHeight;
        $scaledH = 0;

        if ($coverWidth > 0 && $coverHeight > 0) {
            $scaledH = (int)round($coverHeight * (self::SLOT_W / $coverWidth));
            $imgH = max(self::IMG_H_MIN, min(self::IMG_H_MAX, $scaledH));
        } else {
            $scaledH = self::IMG_H_MIN;
            $imgH = self::IMG_H_MIN;
        }

        $totalH = $imgH + self::FOOTER_H;
        $absoluteMin = self::FOOTER_H + 120;
        $totalH = max($absoluteMin, min(self::TOTAL_H_MAX, $totalH));

        return [
            'imgH' => $imgH,
            'totalH' => $totalH,
            'scaledH' => $scaledH,
            'posterW' => self::POSTER_W,
        ];
    }

    /**
     * 商品图：常规按宽 SLOT_W 等比（无左右垫白）；超高图用 m_fill 裁高至 IMG_H_MAX
     */
    private static function buildCoverWatermarkPath($cover, $scaledH)
    {
        $scaledH = (int)$scaledH;
        if ($scaledH > self::IMG_H_MAX) {
            return $cover . '?x-oss-process=image/resize,m_fill,w_' . self::SLOT_W . ',h_' . self::IMG_H_MAX . ',limit_0';
        }

        return $cover . '?x-oss-process=image/resize,m_lfit,w_' . self::SLOT_W . ',limit_0';
    }

    /**
     * 太阳码水平中心 X（用于扫码文案 g_south 居中）
     */
    private static function qrCenterX()
    {
        return self::POSTER_W - self::QR_PAD_RIGHT - (int)(self::QR_SIZE / 2);
    }

    /**
     * 扫码提示文案：位于太阳码正上方居中（g_south = 文字下边中点对齐）
     */
    private static function scanHintYFromBottom()
    {
        return self::QR_PAD_BOTTOM + self::QR_SIZE + self::QR_HINT_GAP;
    }

    /**
     * 动态白底画布（blank.png → 750 × totalH）
     */
    public static function buildCanvasBaseUrl($prefix, $totalH)
    {
        $absoluteMin = self::FOOTER_H + 120;
        $totalH = max($absoluteMin, min(self::TOTAL_H_MAX, (int)$totalH));
        $process = '?x-oss-process=image/resize,m_pad,w_' . self::POSTER_W . ',h_' . $totalH
            . ',color_' . self::CANVAS_COLOR;

        return $prefix . self::BLANK_CANVAS . $process;
    }

    /**
     * 和炫鲜花等门店角标
     */
    public static function buildHyxhLogoWatermark($mainId)
    {
        if (!in_array((int)$mainId, [52, 1459, 13495], true)) {
            return '';
        }
        $logo = 'poster/hyxh_ncd_logo.png?x-oss-process=image/resize,m_fill,h_72,w_72';
        if ($mainId == 1459) {
            $logo = 'poster/hyxh_gcd_logo.png?x-oss-process=image/resize,m_fill,h_72,w_72';
        }
        if ($mainId == 13495) {
            $logo = 'poster/hyxh_hzd_logo.png?x-oss-process=image/resize,m_fill,h_72,w_72';
        }
        return stringUtil::ossBase64($logo);
    }

    /**
     * 花束海报
     */
    public static function buildMallGoodsPosterUrl($prefix, array $options)
    {
        return self::buildMallSharePosterUrl($prefix, $options);
    }

    /**
     * 花材海报（商城散客）
     */
    public static function buildMallItemPosterUrl($prefix, array $options)
    {
        return self::buildMallSharePosterUrl($prefix, $options);
    }

    /**
     * 花农端花店采购海报（ghs 花材详情太阳码）
     */
    public static function buildGhsHdItemPosterUrl($prefix, array $options)
    {
        return self::buildMallSharePosterUrl($prefix, $options);
    }

    /**
     * 散客/花束分享海报：动态画布 + 主图槽位 + 底部信息区
     */
    private static function buildMallSharePosterUrl($prefix, array $options)
    {
        $cover = $options['cover'] ?? '';
        $miniCode = $options['miniCode'] ?? '';
        $priceText = $options['priceText'] ?? '';
        $name = $options['name'] ?? '';
        $staffText = $options['staffText'] ?? '';
        $mainId = (int)($options['mainId'] ?? 0);
        $flowerNum = (int)($options['flowerNum'] ?? 0);
        $subtitle = trim((string)($options['subtitle'] ?? ''));
        $scanHint = trim((string)($options['scanHint'] ?? self::SCAN_HINT));
        if ($scanHint === '微信扫码采购') {
            $scanHint = self::SCAN_HINT;
        }

        $coverW = (int)($options['coverWidth'] ?? 0);
        $coverH = (int)($options['coverHeight'] ?? 0);
        if ($coverW <= 0 || $coverH <= 0) {
            list($coverW, $coverH) = imgUtil::getOssImageSize($cover, $prefix);
        }

        $layout = self::calcPosterLayout($coverW, $coverH);
        $imgH = $layout['imgH'];
        $totalH = $layout['totalH'];

        $displayName = self::truncateText($name, 14);
        if ($flowerNum > 0 && $displayName !== '') {
            $displayName .= ' · ' . $flowerNum . '支';
        } elseif ($subtitle !== '' && $displayName !== '') {
            $displayName .= ' · ' . self::truncateText($subtitle, 8);
        }

        $coverWatermark = self::buildCoverWatermarkPath($cover, $layout['scaledH']);
        $qrWatermark = $miniCode . '?x-oss-process=image/resize,m_fill,h_' . self::QR_SIZE . ',w_' . self::QR_SIZE;

        $url = self::buildCanvasBaseUrl($prefix, $totalH);
        $url .= '/watermark,image_' . stringUtil::ossBase64($coverWatermark)
            . ',g_nw,x_' . self::CANVAS_PAD_X . ',y_8';
        $url .= '/watermark,image_' . stringUtil::ossBase64($qrWatermark) . ',g_se,x_' . self::QR_PAD_RIGHT . ',y_' . self::QR_PAD_BOTTOM;

        $logoB64 = self::buildHyxhLogoWatermark($mainId);
        if ($logoB64 !== '') {
            $url .= '/watermark,image_' . $logoB64 . ',g_se,x_210,y_48';
        }

        $url .= '/watermark,text_' . stringUtil::ossBase64($priceText)
            . ',g_sw,x_' . self::CANVAS_PAD_X . ',y_32,color_EE2C2C,type_' . self::FONT . ',size_56';
        $url .= '/watermark,text_' . stringUtil::ossBase64($displayName)
            . ',g_sw,x_' . self::CANVAS_PAD_X . ',y_102,color_333333,type_' . self::FONT . ',size_36';
        $url .= '/watermark,text_' . stringUtil::ossBase64($staffText)
            . ',g_sw,x_' . self::CANVAS_PAD_X . ',y_148,color_999999,type_' . self::FONT . ',size_26';
        $url .= '/watermark,text_' . stringUtil::ossBase64($scanHint)
            . ',g_south,x_' . self::qrCenterX() . ',y_' . self::scanHintYFromBottom()
            . ',color_888888,type_' . self::FONT . ',size_24';

        return $url;
    }
}