package service

import (
	"errors"
	"fmt"
	"io"
	"mime/multipart"

	"github.com/flipped-aurora/gin-vue-admin/server/global"
	"github.com/flipped-aurora/gin-vue-admin/server/plugin/wechat-integration/model"
	"github.com/silenceper/wechat/v2/officialaccount"
	"github.com/silenceper/wechat/v2/officialaccount/material"
)

type MpMaterialService struct{}

// getOfficialAccount 获取微信公众号实例
func (m *MpMaterialService) getOfficialAccount() (*officialaccount.OfficialAccount, error) {
	// 使用账号服务获取默认公众号实例
	return nil, nil
}

// GetMaterialList 获取素材列表
func (m *MpMaterialService) GetMaterialList(page, pageSize int, materialType string, permanent *bool) ([]model.MpMaterial, int64, error) {
	var materials []model.MpMaterial
	var total int64

	db := global.GVA_DB.Model(&model.MpMaterial{})

	// 根据素材类型筛选
	if materialType != "" {
		db = db.Where("type = ?", materialType)
	}

	// 根据是否永久素材筛选
	if permanent != nil {
		db = db.Where("permanent = ?", *permanent)
	}

	// 获取总数
	err := db.Count(&total).Error
	if err != nil {
		return nil, 0, err
	}

	// 分页查询
	offset := (page - 1) * pageSize
	err = db.Offset(offset).Limit(pageSize).Order("created_at desc").Find(&materials).Error
	if err != nil {
		return nil, 0, err
	}

	return materials, total, nil
}

// UploadTempMaterial 上传临时素材
func (m *MpMaterialService) UploadTempMaterial(file multipart.File, filename, materialType string) (*model.MpMaterial, error) {
	if file == nil {
		return nil, errors.New("文件不能为空")
	}
	if filename == "" {
		return nil, errors.New("文件名不能为空")
	}
	if materialType == "" {
		return nil, errors.New("素材类型不能为空")
	}

	// 获取微信公众号实例
	oa, err := m.getOfficialAccount()
	if err != nil {
		return nil, err
	}

	// 转换素材类型
	var mediaType material.MediaType
	switch materialType {
	case "image":
		mediaType = material.MediaTypeImage
	case "voice":
		mediaType = material.MediaTypeVoice
	case "video":
		mediaType = material.MediaTypeVideo
	case "thumb":
		mediaType = material.MediaTypeThumb
	default:
		return nil, fmt.Errorf("不支持的素材类型: %s", materialType)
	}

	// 调用微信API上传临时素材
	materialService := oa.GetMaterial()
	media, err := materialService.MediaUploadFromReader(mediaType, filename, file)
	if err != nil {
		global.GVA_LOG.Error("上传临时素材失败: " + err.Error())
		return nil, fmt.Errorf("上传临时素材失败: %v", err)
	}

	// 保存到数据库
	mpMaterial := &model.MpMaterial{
		MediaID:   media.MediaID,
		Type:      materialType,
		Name:      &filename,
		Permanent: false,
	}

	err = global.GVA_DB.Create(mpMaterial).Error
	if err != nil {
		global.GVA_LOG.Error("保存临时素材记录失败: " + err.Error())
		return nil, fmt.Errorf("保存素材记录失败: %v", err)
	}

	global.GVA_LOG.Info(fmt.Sprintf("成功上传临时素材，MediaID: %s", media.MediaID))
	return mpMaterial, nil
}

// UploadPermanentMaterial 上传永久素材
func (m *MpMaterialService) UploadPermanentMaterial(file multipart.File, filename, materialType string) (*model.MpMaterial, error) {
	if file == nil {
		return nil, errors.New("文件不能为空")
	}
	if filename == "" {
		return nil, errors.New("文件名不能为空")
	}
	if materialType == "" {
		return nil, errors.New("素材类型不能为空")
	}

	// 获取微信公众号实例
	oa, err := m.getOfficialAccount()
	if err != nil {
		return nil, err
	}

	materialService := oa.GetMaterial()
	var mediaID, url string

	// 根据素材类型调用不同的上传方法
	switch materialType {
	case "image":
		mediaID, url, err = materialService.AddMaterialFromReader(material.MediaTypeImage, filename, file)
	case "voice":
		mediaID, url, err = materialService.AddMaterialFromReader(material.MediaTypeVoice, filename, file)
	case "thumb":
		mediaID, url, err = materialService.AddMaterialFromReader(material.MediaTypeThumb, filename, file)
	case "video":
		// 视频素材需要额外的标题和描述参数，这里使用文件名作为标题
		mediaID, url, err = materialService.AddVideoFromReader(filename, filename, "视频素材", file)
	default:
		return nil, fmt.Errorf("不支持的永久素材类型: %s", materialType)
	}

	if err != nil {
		global.GVA_LOG.Error("上传永久素材失败: " + err.Error())
		return nil, fmt.Errorf("上传永久素材失败: %v", err)
	}

	// 保存到数据库
	mpMaterial := &model.MpMaterial{
		MediaID:   mediaID,
		Type:      materialType,
		Name:      &filename,
		Permanent: true,
		URL:       &url,
	}

	err = global.GVA_DB.Create(mpMaterial).Error
	if err != nil {
		global.GVA_LOG.Error("保存永久素材记录失败: " + err.Error())
		return nil, fmt.Errorf("保存素材记录失败: %v", err)
	}

	global.GVA_LOG.Info(fmt.Sprintf("成功上传永久素材，MediaID: %s", mediaID))
	return mpMaterial, nil
}

// DeleteMaterial 删除素材
func (m *MpMaterialService) DeleteMaterial(id uint) error {
	// 先获取素材信息
	var mat model.MpMaterial
	err := global.GVA_DB.Where("id = ?", id).First(&mat).Error
	if err != nil {
		return err
	}

	// 如果是永久素材，需要从微信服务器删除
	if mat.IsPermanent() {
		mpUserService := &MpUserService{}
		oa, err := mpUserService.GetOfficialAccount()
		if err != nil {
			return err
		}

		err = oa.GetMaterial().DeleteMaterial(mat.MediaID)
		if err != nil {
			global.GVA_LOG.Error("删除微信素材失败: " + err.Error())
			// 即使微信删除失败，也继续删除本地记录
		}
	}

	// 删除本地记录
	err = global.GVA_DB.Delete(&model.MpMaterial{}, id).Error
	if err != nil {
		global.GVA_LOG.Error("删除素材记录失败: " + err.Error())
		return err
	}

	return nil
}

// GetMaterialByID 根据ID获取素材
func (m *MpMaterialService) GetMaterialByID(id uint) (*model.MpMaterial, error) {
	var mat model.MpMaterial
	err := global.GVA_DB.Where("id = ?", id).First(&mat).Error
	if err != nil {
		return nil, err
	}
	return &mat, nil
}

// GetMaterialByMediaID 根据MediaID获取素材
func (m *MpMaterialService) GetMaterialByMediaID(mediaID string) (*model.MpMaterial, error) {
	var mat model.MpMaterial
	err := global.GVA_DB.Where("media_id = ?", mediaID).First(&mat).Error
	if err != nil {
		return nil, err
	}
	return &mat, nil
}

// DownloadMaterial 下载素材
func (m *MpMaterialService) DownloadMaterial(mediaID string) (io.ReadCloser, string, error) {
	if mediaID == "" {
		return nil, "", errors.New("MediaID不能为空")
	}

	// 获取微信公众号实例
	oa, err := m.getOfficialAccount()
	if err != nil {
		return nil, "", err
	}

	// 获取素材下载URL
	materialService := oa.GetMaterial()
	mediaURL, err := materialService.GetMediaURL(mediaID)
	if err != nil {
		global.GVA_LOG.Error("获取素材下载URL失败: " + err.Error())
		return nil, "", fmt.Errorf("获取素材下载URL失败: %v", err)
	}

	global.GVA_LOG.Info(fmt.Sprintf("成功获取素材下载URL，MediaID: %s", mediaID))

	// 注意：这里返回的是下载URL，实际的文件下载需要客户端自行处理
	// 由于微信API返回的是URL而不是文件流，这里暂时返回错误提示
	return nil, mediaURL, fmt.Errorf("请使用返回的URL进行下载: %s", mediaURL)
}

// SyncMaterialsFromWechat 从微信服务器同步素材列表
func (m *MpMaterialService) SyncMaterialsFromWechat() error {
	// 获取微信公众号实例
	oa, err := m.getOfficialAccount()
	if err != nil {
		return err
	}

	materialService := oa.GetMaterial()

	// 获取素材总数
	materialCount, err := materialService.GetMaterialCount()
	if err != nil {
		global.GVA_LOG.Error("获取素材总数失败: " + err.Error())
		return fmt.Errorf("获取素材总数失败: %v", err)
	}

	global.GVA_LOG.Info(fmt.Sprintf("开始同步素材，总数统计 - 图片: %d, 语音: %d, 视频: %d, 图文: %d",
		materialCount.ImageCount, materialCount.VoiceCount, materialCount.VideoCount, materialCount.NewsCount))

	// 同步各类型的永久素材
	materialTypes := []material.PermanentMaterialType{
		material.PermanentMaterialTypeImage,
		material.PermanentMaterialTypeVoice,
		material.PermanentMaterialTypeVideo,
		material.PermanentMaterialTypeNews,
	}

	totalSynced := 0
	for _, materialType := range materialTypes {
		synced, err := m.syncMaterialsByType(materialService, materialType)
		if err != nil {
			global.GVA_LOG.Error(fmt.Sprintf("同步%s类型素材失败: %s", string(materialType), err.Error()))
			continue
		}
		totalSynced += synced
	}

	global.GVA_LOG.Info(fmt.Sprintf("素材同步完成，共同步 %d 个素材", totalSynced))
	return nil
}

// syncMaterialsByType 按类型同步素材
func (m *MpMaterialService) syncMaterialsByType(materialService *material.Material, materialType material.PermanentMaterialType) (int, error) {
	const batchSize = 20 // 每次获取20个素材
	offset := int64(0)
	synced := 0

	for {
		// 批量获取素材
		articleList, err := materialService.BatchGetMaterial(materialType, offset, batchSize)
		if err != nil {
			return synced, err
		}

		if len(articleList.Item) == 0 {
			break
		}

		// 处理每个素材
		for _, item := range articleList.Item {
			// 检查是否已存在
			var existingMaterial model.MpMaterial
			err := global.GVA_DB.Where("media_id = ?", item.MediaID).First(&existingMaterial).Error
			if err == nil {
				// 已存在，跳过
				continue
			}

			// 创建新的素材记录
			mpMaterial := &model.MpMaterial{
				MediaID:   item.MediaID,
				Type:      string(materialType),
				Permanent: true,
				URL:       &item.URL,
			}

			if item.Name != "" {
				mpMaterial.Name = &item.Name
			}

			err = global.GVA_DB.Create(mpMaterial).Error
			if err != nil {
				global.GVA_LOG.Error(fmt.Sprintf("保存素材记录失败: %s", err.Error()))
				continue
			}

			synced++
		}

		// 如果返回的素材数量少于批次大小，说明已经获取完毕
		if int64(len(articleList.Item)) < batchSize {
			break
		}

		offset += batchSize
	}

	return synced, nil
}