<?php

namespace app\common\service;

use Exception;

class ImageMagickCompressService
{
    /**
     * 使用ImageMagick压缩图片
     */
    public static function compress($sourcePath, $compressConfig = [])
    {
        try {
            // 检查ImageMagick扩展
            if (!extension_loaded('imagick')) {
                outFileLog('ImageMagick扩展未安装', 'upload_img', 'imagick_not_installed');
                return false;
            }

            // 默认配置
            $config = array_merge([
                'max_width' => 1920,
                'max_height' => 1080,
                'quality' => 80,
                'format' => null // 保持原格式
            ], $compressConfig);

            // 检查源文件
            if (!file_exists($sourcePath)) {
                throw new Exception('源文件不存在: ' . $sourcePath);
            }

            // 获取文件信息
            $pathInfo = pathinfo($sourcePath);
            $extension = strtolower($pathInfo['extension']);
            
            // 支持的格式
            $supportedFormats = ['jpg', 'jpeg', 'png', 'gif', 'webp', 'bmp'];
            if (!in_array($extension, $supportedFormats)) {
                outFileLog('不支持的图片格式: ' . $extension, 'upload_img', 'unsupported_format');
                return false;
            }

            // 创建Imagick对象
            $imagick = new \Imagick($sourcePath);
            
            // 获取原始尺寸
            $originalWidth = $imagick->getImageWidth();
            $originalHeight = $imagick->getImageHeight();
            
            outFileLog("原始尺寸: {$originalWidth}x{$originalHeight}", 'upload_img', 'original_size');

            // 计算新尺寸
            $newSize = self::calculateNewSize(
                $originalWidth, 
                $originalHeight, 
                $config['max_width'], 
                $config['max_height']
            );

            // 如果需要缩放
            if ($newSize['width'] < $originalWidth || $newSize['height'] < $originalHeight) {
                $imagick->resizeImage(
                    $newSize['width'], 
                    $newSize['height'], 
                    \Imagick::FILTER_LANCZOS, 
                    1
                );
                outFileLog("压缩后尺寸: {$newSize['width']}x{$newSize['height']}", 'upload_img', 'compressed_size');
            }

            // 设置压缩质量
            $imagick->setImageCompressionQuality($config['quality']);
            
            // 去除EXIF信息减小文件大小
            $imagick->stripImage();

            // 生成压缩后的文件路径
            $compressedPath = self::generateCompressedPath($sourcePath);
            
            // 保存压缩后的图片
            $imagick->writeImage($compressedPath);
            $imagick->clear();
            $imagick->destroy();

            // 检查压缩效果
            $originalSize = filesize($sourcePath);
            $compressedSize = filesize($compressedPath);
            $compressionRatio = round((1 - $compressedSize / $originalSize) * 100, 2);
            
            outFileLog("压缩完成，原大小: {$originalSize}字节，压缩后: {$compressedSize}字节，压缩率: {$compressionRatio}%", 'upload_img', 'compression_result');

            return $compressedPath;

        } catch (Exception $e) {
            outFileLog('ImageMagick压缩失败: ' . $e->getMessage(), 'upload_img', 'imagick_compress_error');
            return false;
        }
    }

    /**
     * 计算新尺寸（保持宽高比）
     */
    private static function calculateNewSize($width, $height, $maxWidth, $maxHeight)
    {
        $ratio = min($maxWidth / $width, $maxHeight / $height, 1);
        return [
            'width' => intval($width * $ratio),
            'height' => intval($height * $ratio)
        ];
    }

    /**
     * 生成压缩后的文件路径
     */
    private static function generateCompressedPath($sourcePath)
    {
        $pathInfo = pathinfo($sourcePath);
        return $pathInfo['dirname'] . '/' . $pathInfo['filename'] . '_compressed.' . $pathInfo['extension'];
    }
}