package handler

import (
	"encoding/base64"
	"net/http"

	"gen2d/internal/logger"
	"gen2d/internal/model"
	"gen2d/internal/service"

	"github.com/gin-gonic/gin"
)

// EditImageRequest 图片编辑请求。
type EditImageRequest struct {
	Image  string `json:"image" binding:"required"` // 底图 base64 编码
	Prompt string `json:"prompt" binding:"required"` // 编辑指令
	Count  int    `json:"count"`                     // 生成数量，默认 1
}

// editAssetResponse 编辑结果素材（返回 base64）。
type editAssetResponse struct {
	Data   string `json:"data"`
	Format string `json:"format"`
}

// EditImageResponse 图片编辑响应体。
type EditImageResponse struct {
	Assets []editAssetResponse `json:"assets"`
}

// EditImage 图片编辑接口，基于已有图片和文本指令生成修改后的图片。
func EditImage(c *gin.Context) {
	var req EditImageRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Fail(http.StatusBadRequest, "参数错误: "+err.Error()))
		return
	}

	imageData, err := base64.StdEncoding.DecodeString(req.Image)
	if err != nil {
		c.JSON(http.StatusBadRequest, model.Fail(http.StatusBadRequest, "图片 base64 解码失败"))
		return
	}

	count := req.Count
	if count <= 0 {
		count = 1
	}

	images, err := service.EditImages(c.Request.Context(), imageData, req.Prompt, count)
	if err != nil {
		logger.FromCtx(c.Request.Context()).Error("图片编辑失败", "error", err)
		c.JSON(http.StatusInternalServerError, model.Fail(http.StatusInternalServerError, "图片编辑失败"))
		return
	}

	assets := make([]editAssetResponse, len(images))
	for i, img := range images {
		assets[i] = editAssetResponse{
			Data:   base64.StdEncoding.EncodeToString(img.Data),
			Format: img.Format,
		}
	}

	c.JSON(http.StatusOK, model.OK(EditImageResponse{Assets: assets}))
}