package image

import (
	"encoding/base64"
	"encoding/json"
	"fmt"

	planBTypeModules "planA/planB/type/modules"
)

// AddWatermarkFromURLExs 添加水印
func AddWatermarkFromURLExs(sourceImageUrl, watermarkUrl string) (string, error) {
	watermarkConfig := WatermarkConfig{
		SourceImageURL:  sourceImageUrl,
		WatermarkBase64: watermarkUrl,
		Position:        "center",
		Opacity:         1.0,
		Scale:           1.0,
		TileSpacing:     50,
		Timeout:         30,
		OutputFormat:    "jpeg",
		JPEGQuality:     95,
		TargetWidth:     800,
		TargetHeight:    800,
		ResizeMode:      "fit",
	}

	imgBytes, imgFormat, err := AddWatermarkFromURL(watermarkConfig)
	if err != nil {
		return "", fmt.Errorf("打水印失败: %v", err)
	}

	// 构建带MIME前缀的Base64数据（匹配原DLL返回格式）
	var base64Data string
	switch imgFormat {
	case "jpeg", "jpg":
		base64Data = "data:image/jpeg;base64," + base64.StdEncoding.EncodeToString(imgBytes)
	case "png":
		base64Data = "data:image/png;base64," + base64.StdEncoding.EncodeToString(imgBytes)
	case "gif":
		base64Data = "data:image/gif;base64," + base64.StdEncoding.EncodeToString(imgBytes)
	default:
		base64Data = "data:image/jpeg;base64," + base64.StdEncoding.EncodeToString(imgBytes)
	}

	result := planBTypeModules.ImageResult{
		Success: true,
		Format:  imgFormat,
		Data:    base64Data,
	}

	resultJson, err := json.Marshal(result)
	if err != nil {
		return "", fmt.Errorf("JSON序列化失败: %v", err)
	}

	return string(resultJson), nil
}