package alias

import (
	"context"
	"fmt"
	stdpath "path"
	"strings"

	"github.com/alist-org/alist/v3/internal/errs"
	"github.com/alist-org/alist/v3/internal/fs"
	"github.com/alist-org/alist/v3/internal/model"
	"github.com/alist-org/alist/v3/internal/sign"
	"github.com/alist-org/alist/v3/pkg/utils"
	"github.com/alist-org/alist/v3/server/common"
)

func (d *Alias) listRoot() []model.Obj {
	var objs []model.Obj
	for k := range d.pathMap {
		obj := model.Object{
			Name:     k,
			IsFolder: true,
			Modified: d.Modified,
		}
		objs = append(objs, &obj)
	}
	return objs
}

// do others that not defined in Driver interface
func getPair(path string) (string, string) {
	//path = strings.TrimSpace(path)
	if strings.Contains(path, ":") {
		pair := strings.SplitN(path, ":", 2)
		if !strings.Contains(pair[0], "/") {
			return pair[0], pair[1]
		}
	}
	return stdpath.Base(path), path
}

func (d *Alias) getRootAndPath(path string) (string, string) {
	if d.autoFlatten {
		return d.oneKey, path
	}
	path = strings.TrimPrefix(path, "/")
	parts := strings.SplitN(path, "/", 2)
	if len(parts) == 1 {
		return parts[0], ""
	}
	return parts[0], parts[1]
}

func (d *Alias) get(ctx context.Context, path string, dst, sub string) (model.Obj, error) {
	obj, err := fs.Get(ctx, stdpath.Join(dst, sub), &fs.GetArgs{NoLog: true})
	if err != nil {
		return nil, err
	}
	return &model.Object{
		Path:     path,
		Name:     obj.GetName(),
		Size:     obj.GetSize(),
		Modified: obj.ModTime(),
		IsFolder: obj.IsDir(),
	}, nil
}

func (d *Alias) list(ctx context.Context, dst, sub string, args *fs.ListArgs) ([]model.Obj, error) {
	objs, err := fs.List(ctx, stdpath.Join(dst, sub), args)
	// the obj must implement the model.SetPath interface
	// return objs, err
	if err != nil {
		return nil, err
	}
	return utils.SliceConvert(objs, func(obj model.Obj) (model.Obj, error) {
		thumb, ok := model.GetThumb(obj)
		objRes := model.Object{
			Name:     obj.GetName(),
			Size:     obj.GetSize(),
			Modified: obj.ModTime(),
			IsFolder: obj.IsDir(),
		}
		if !ok {
			return &objRes, nil
		}
		return &model.ObjThumb{
			Object: objRes,
			Thumbnail: model.Thumbnail{
				Thumbnail: thumb,
			},
		}, nil
	})
}

func (d *Alias) link(ctx context.Context, dst, sub string, args model.LinkArgs) (*model.Link, error) {
	reqPath := stdpath.Join(dst, sub)
	storage, err := fs.GetStorage(reqPath, &fs.GetStoragesArgs{})
	if err != nil {
		return nil, err
	}
	_, err = fs.Get(ctx, reqPath, &fs.GetArgs{NoLog: true})
	if err != nil {
		return nil, err
	}
	if common.ShouldProxy(storage, stdpath.Base(sub)) {
		link := &model.Link{
			URL: fmt.Sprintf("%s/p%s?sign=%s",
				common.GetApiUrl(args.HttpReq),
				utils.EncodePath(reqPath, true),
				sign.Sign(reqPath)),
		}
		if args.HttpReq != nil && d.ProxyRange {
			link.RangeReadCloser = common.NoProxyRange
		}
		return link, nil
	}
	link, _, err := fs.Link(ctx, reqPath, args)
	return link, err
}

func (d *Alias) getReqPath(ctx context.Context, obj model.Obj) (*string, error) {
	root, sub := d.getRootAndPath(obj.GetPath())
	if sub == "" {
		return nil, errs.NotSupport
	}
	dsts, ok := d.pathMap[root]
	if !ok {
		return nil, errs.ObjectNotFound
	}
	var reqPath *string
	for _, dst := range dsts {
		path := stdpath.Join(dst, sub)
		_, err := fs.Get(ctx, path, &fs.GetArgs{NoLog: true})
		if err != nil {
			continue
		}
		if !d.ProtectSameName {
			return &path, nil
		}
		if ok {
			ok = false
		} else {
			return nil, errs.NotImplement
		}
		reqPath = &path
	}
	if reqPath == nil {
		return nil, errs.ObjectNotFound
	}
	return reqPath, nil
}