package wallpaper

import (
	"context"
	"io"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"

	wallpaperv1 "service.xpcool.com/api/wallpaper"
	"service.xpcool.com/internal/model/dto"
	wallpapersvc "service.xpcool.com/internal/service/wallpaper"
)

// Controller 后台管理接口（走 RBAC 权限）。
type Controller struct{}

// New 构造后台控制器。
func New() *Controller { return &Controller{} }

// ---------------------------------------------------------------------------
// 自建图库
// ---------------------------------------------------------------------------

// List 图库列表（含已停用项，便于重新启用）。
func (c *Controller) List(ctx context.Context, req *wallpaperv1.AdminListReq) (res *wallpaperv1.AdminListRes, err error) {
	q := dto.WallpaperQuery{
		Query:       req.Query,
		Orientation: req.Orientation,
		Page:        req.Page,
		Size:        req.Size,
	}
	items, total, err := wallpapersvc.Wallpaper().LibraryAdminList(ctx, q, req.Enabled)
	if err != nil {
		return nil, err
	}
	return &wallpaperv1.AdminListRes{List: toAPIItems(items), Total: total}, nil
}

// Upload 批量上传壁纸。
//
// 刻意「逐文件返回结果」而不是整体成功/失败：一次传 20 张，其中 1 张格式不对时，
// 用户希望的是「19 张成功、1 张告诉我为什么失败」，而不是全部回滚重来。
func (c *Controller) Upload(ctx context.Context, req *wallpaperv1.AdminUploadReq) (res *wallpaperv1.AdminUploadRes, err error) {
	if len(req.Files) == 0 {
		return nil, gerror.New("没有收到文件")
	}

	out := make([]*wallpaperv1.UploadItem, 0, len(req.Files))
	okCount, failCount := 0, 0
	for _, f := range req.Files {
		row := &wallpaperv1.UploadItem{FileName: f.Filename}
		data, readErr := readUpload(f)
		if readErr != nil {
			row.Message = readErr.Error()
			failCount++
			out = append(out, row)
			continue
		}
		item, duplicated, upErr := wallpapersvc.Wallpaper().Upload(ctx, f.Filename, data, dto.WallpaperSaveInput{
			Title:    req.Title,
			Tags:     req.Tags,
			Category: req.Category,
			Sort:     req.Sort,
			Enabled:  1,
		})
		if upErr != nil {
			row.Message = upErr.Error()
			failCount++
			out = append(out, row)
			continue
		}
		row.Ok = true
		row.Duplicated = duplicated
		row.Item = toAPIItem(item)
		if duplicated {
			row.Message = "内容重复，已指向图库中已有的图片"
		} else {
			row.Message = "上传成功"
		}
		okCount++
		out = append(out, row)
	}
	return &wallpaperv1.AdminUploadRes{List: out, OkCount: okCount, FailCount: failCount}, nil
}

// readUpload 把一个上传文件读成字节切片。
//
// 先看 Size 再读：超限的文件直接拒绝，避免把一个 200MB 的文件读进内存才发现。
func readUpload(f *ghttp.UploadFile) ([]byte, error) {
	if f == nil {
		return nil, gerror.New("文件为空")
	}
	if f.Size <= 0 {
		return nil, gerror.New("文件为空")
	}
	if f.Size > wallpapersvc.MaxUploadBytes {
		return nil, gerror.Newf("文件超过 %d MB 上限", wallpapersvc.MaxUploadBytes>>20)
	}
	rc, err := f.Open()
	if err != nil {
		return nil, gerror.New("读取上传文件失败")
	}
	defer func() { _ = rc.Close() }()

	data, err := io.ReadAll(io.LimitReader(rc, wallpapersvc.MaxUploadBytes+1))
	if err != nil {
		return nil, gerror.New("读取上传文件失败")
	}
	if int64(len(data)) > wallpapersvc.MaxUploadBytes {
		return nil, gerror.Newf("文件超过 %d MB 上限", wallpapersvc.MaxUploadBytes>>20)
	}
	return data, nil
}

// Save 保存壁纸元数据。
func (c *Controller) Save(ctx context.Context, req *wallpaperv1.AdminSaveReq) (res *wallpaperv1.AdminSaveRes, err error) {
	err = wallpapersvc.Wallpaper().SaveMeta(ctx, dto.WallpaperSaveInput{
		Id:       req.Id,
		Title:    req.Title,
		Tags:     req.Tags,
		Category: req.Category,
		Enabled:  req.Enabled,
		Sort:     req.Sort,
		Remark:   req.Remark,
	})
	if err != nil {
		return nil, err
	}
	return &wallpaperv1.AdminSaveRes{Message: "保存成功"}, nil
}

// Delete 删除壁纸。
func (c *Controller) Delete(ctx context.Context, req *wallpaperv1.AdminDeleteReq) (res *wallpaperv1.AdminDeleteRes, err error) {
	if err = wallpapersvc.Wallpaper().Delete(ctx, req.Id); err != nil {
		return nil, err
	}
	return &wallpaperv1.AdminDeleteRes{Message: "删除成功"}, nil
}

// Stats 图库概览。
func (c *Controller) Stats(ctx context.Context, req *wallpaperv1.AdminStatsReq) (res *wallpaperv1.AdminStatsRes, err error) {
	st, err := wallpapersvc.Wallpaper().Stat(ctx)
	if err != nil {
		return nil, err
	}
	return &wallpaperv1.AdminStatsRes{
		Total:      st.Total,
		Enabled:    st.Enabled,
		Disabled:   st.Disabled,
		Portrait:   st.Portrait,
		Landscape:  st.Landscape,
		TotalBytes: st.TotalBytes,
	}, nil
}

// ---------------------------------------------------------------------------
// 开源平台配置
// ---------------------------------------------------------------------------

// SourceList 平台配置列表。
func (c *Controller) SourceList(ctx context.Context, req *wallpaperv1.AdminSourceListReq) (res *wallpaperv1.AdminSourceListRes, err error) {
	list, err := wallpapersvc.Wallpaper().Sources(ctx)
	if err != nil {
		return nil, err
	}
	out := make([]*wallpaperv1.SourceInfo, 0, len(list))
	for i := range list {
		// 后台带配置：编辑界面需要回显 defaultQuery / purity / baseUrl 等，
		// 否则用户只改开关也会把这些字段一并清空。
		out = append(out, toAPISource(&list[i], true))
	}
	return &wallpaperv1.AdminSourceListRes{List: out}, nil
}

// SourceSave 保存平台配置。
func (c *Controller) SourceSave(ctx context.Context, req *wallpaperv1.AdminSourceSaveReq) (res *wallpaperv1.AdminSourceSaveRes, err error) {
	err = wallpapersvc.Wallpaper().SaveSource(ctx, dto.WallpaperSourceSaveInput{
		Code:    req.Code,
		Name:    req.Name,
		Enabled: req.Enabled,
		Sort:    req.Sort,
		Remark:  req.Remark,
		Config:  req.Config,
	})
	if err != nil {
		return nil, err
	}
	return &wallpaperv1.AdminSourceSaveRes{Message: "保存成功"}, nil
}

// SourceTest 测试平台连通性。
func (c *Controller) SourceTest(ctx context.Context, req *wallpaperv1.AdminSourceTestReq) (res *wallpaperv1.AdminSourceTestRes, err error) {
	msg, err := wallpapersvc.Wallpaper().TestSource(ctx, req.Code)
	if err != nil {
		// 测试失败是「预期内的结果」而不是接口异常，故把原因作为数据返回，
		// 让前端能直接在界面上展示，而不是弹一个通用错误。
		g.Log().Infof(ctx, "平台连通性测试未通过 code=%s: %v", req.Code, err)
		return &wallpaperv1.AdminSourceTestRes{Ok: false, Message: err.Error()}, nil
	}
	return &wallpaperv1.AdminSourceTestRes{Ok: true, Message: msg}, nil
}