package api

import (
	"errors"
	"fmt"
	"net/http"
	"strconv"

	"github.com/grafana/grafana/pkg/api/apierrors"
	"github.com/grafana/grafana/pkg/api/dtos"
	"github.com/grafana/grafana/pkg/api/response"
	"github.com/grafana/grafana/pkg/models"
	"github.com/grafana/grafana/pkg/services/dashboards"
	"github.com/grafana/grafana/pkg/services/guardian"
	"github.com/grafana/grafana/pkg/services/libraryelements"
	"github.com/grafana/grafana/pkg/util"
	"github.com/grafana/grafana/pkg/web"
)

// swagger:route GET /folders folders getFolders
//
// Get all folders.
//
// Returns all folders that the authenticated user has permission to view.
//
// Responses:
// 200: getFoldersResponse
// 401: unauthorisedError
// 403: forbiddenError
// 500: internalServerError
func (hs *HTTPServer) GetFolders(c *models.ReqContext) response.Response {
	folders, err := hs.folderService.GetFolders(c.Req.Context(), c.SignedInUser, c.OrgID, c.QueryInt64("limit"), c.QueryInt64("page"))

	if err != nil {
		return apierrors.ToFolderErrorResponse(err)
	}

	uids := make(map[string]bool, len(folders))
	result := make([]dtos.FolderSearchHit, 0)
	for _, f := range folders {
		uids[f.Uid] = true
		result = append(result, dtos.FolderSearchHit{
			Id:    f.Id,
			Uid:   f.Uid,
			Title: f.Title,
		})
	}

	metadata := hs.getMultiAccessControlMetadata(c, c.OrgID, dashboards.ScopeFoldersPrefix, uids)
	if len(metadata) > 0 {
		for i := range result {
			result[i].AccessControl = metadata[result[i].Uid]
		}
	}

	return response.JSON(http.StatusOK, result)
}

// swagger:route GET /folders/{folder_uid} folders getFolderByUID
//
// Get folder by uid.
//
// Responses:
// 200: folderResponse
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 500: internalServerError
func (hs *HTTPServer) GetFolderByUID(c *models.ReqContext) response.Response {
	folder, err := hs.folderService.GetFolderByUID(c.Req.Context(), c.SignedInUser, c.OrgID, web.Params(c.Req)[":uid"])
	if err != nil {
		return apierrors.ToFolderErrorResponse(err)
	}

	g := guardian.New(c.Req.Context(), folder.Id, c.OrgID, c.SignedInUser)
	return response.JSON(http.StatusOK, hs.toFolderDto(c, g, folder))
}

// swagger:route GET /folders/id/{folder_id} folders getFolderByID
//
// Get folder by id.
//
// Returns the folder identified by id.
//
// Responses:
// 200: folderResponse
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 500: internalServerError
func (hs *HTTPServer) GetFolderByID(c *models.ReqContext) response.Response {
	id, err := strconv.ParseInt(web.Params(c.Req)[":id"], 10, 64)
	if err != nil {
		return response.Error(http.StatusBadRequest, "id is invalid", err)
	}
	folder, err := hs.folderService.GetFolderByID(c.Req.Context(), c.SignedInUser, id, c.OrgID)
	if err != nil {
		return apierrors.ToFolderErrorResponse(err)
	}

	g := guardian.New(c.Req.Context(), folder.Id, c.OrgID, c.SignedInUser)
	return response.JSON(http.StatusOK, hs.toFolderDto(c, g, folder))
}

// swagger:route POST /folders folders createFolder
//
// Create folder.
//
// Responses:
// 200: folderResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 409: conflictError
// 500: internalServerError
func (hs *HTTPServer) CreateFolder(c *models.ReqContext) response.Response {
	cmd := models.CreateFolderCommand{}
	if err := web.Bind(c.Req, &cmd); err != nil {
		return response.Error(http.StatusBadRequest, "bad request data", err)
	}
	folder, err := hs.folderService.CreateFolder(c.Req.Context(), c.SignedInUser, c.OrgID, cmd.Title, cmd.Uid)
	if err != nil {
		return apierrors.ToFolderErrorResponse(err)
	}

	g := guardian.New(c.Req.Context(), folder.Id, c.OrgID, c.SignedInUser)
	return response.JSON(http.StatusOK, hs.toFolderDto(c, g, folder))
}

// swagger:route PUT /folders/{folder_uid} folders updateFolder
//
// Update folder.
//
// Responses:
// 200: folderResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 409: conflictError
// 500: internalServerError
func (hs *HTTPServer) UpdateFolder(c *models.ReqContext) response.Response {
	cmd := models.UpdateFolderCommand{}
	if err := web.Bind(c.Req, &cmd); err != nil {
		return response.Error(http.StatusBadRequest, "bad request data", err)
	}
	err := hs.folderService.UpdateFolder(c.Req.Context(), c.SignedInUser, c.OrgID, web.Params(c.Req)[":uid"], &cmd)
	if err != nil {
		return apierrors.ToFolderErrorResponse(err)
	}
	g := guardian.New(c.Req.Context(), cmd.Result.Id, c.OrgID, c.SignedInUser)
	return response.JSON(http.StatusOK, hs.toFolderDto(c, g, cmd.Result))
}

// swagger:route DELETE /folders/{folder_uid} folders deleteFolder
//
// Delete folder.
//
// Deletes an existing folder identified by UID along with all dashboards (and their alerts) stored in the folder. This operation cannot be reverted.
//
// Responses:
// 200: deleteFolderResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 500: internalServerError
func (hs *HTTPServer) DeleteFolder(c *models.ReqContext) response.Response { // temporarily adding this function to HTTPServer, will be removed from HTTPServer when librarypanels featuretoggle is removed
	err := hs.LibraryElementService.DeleteLibraryElementsInFolder(c.Req.Context(), c.SignedInUser, web.Params(c.Req)[":uid"])
	if err != nil {
		if errors.Is(err, libraryelements.ErrFolderHasConnectedLibraryElements) {
			return response.Error(403, "Folder could not be deleted because it contains library elements in use", err)
		}
		return apierrors.ToFolderErrorResponse(err)
	}

	uid := web.Params(c.Req)[":uid"]
	f, err := hs.folderService.DeleteFolder(c.Req.Context(), c.SignedInUser, c.OrgID, uid, c.QueryBool("forceDeleteRules"))
	if err != nil {
		return apierrors.ToFolderErrorResponse(err)
	}

	return response.JSON(http.StatusOK, util.DynMap{
		"title":   f.Title,
		"message": fmt.Sprintf("Folder %s deleted", f.Title),
		"id":      f.Id,
	})
}

func (hs *HTTPServer) toFolderDto(c *models.ReqContext, g guardian.DashboardGuardian, folder *models.Folder) dtos.Folder {
	canEdit, _ := g.CanEdit()
	canSave, _ := g.CanSave()
	canAdmin, _ := g.CanAdmin()
	canDelete, _ := g.CanDelete()

	// Finding creator and last updater of the folder
	updater, creator := anonString, anonString
	if folder.CreatedBy > 0 {
		creator = hs.getUserLogin(c.Req.Context(), folder.CreatedBy)
	}
	if folder.UpdatedBy > 0 {
		updater = hs.getUserLogin(c.Req.Context(), folder.UpdatedBy)
	}

	return dtos.Folder{
		Id:            folder.Id,
		Uid:           folder.Uid,
		Title:         folder.Title,
		Url:           folder.Url,
		HasACL:        folder.HasACL,
		CanSave:       canSave,
		CanEdit:       canEdit,
		CanAdmin:      canAdmin,
		CanDelete:     canDelete,
		CreatedBy:     creator,
		Created:       folder.Created,
		UpdatedBy:     updater,
		Updated:       folder.Updated,
		Version:       folder.Version,
		AccessControl: hs.getAccessControlMetadata(c, c.OrgID, dashboards.ScopeFoldersPrefix, folder.Uid),
	}
}

// swagger:parameters getFolders
type GetFoldersParams struct {
	// Limit the maximum number of folders to return
	// in:query
	// required:false
	// default:1000
	Limit int64 `json:"limit"`
	// Page index for starting fetching folders
	// in:query
	// required:false
	// default:1
	Page int64 `json:"page"`
}

// swagger:parameters getFolderByUID
type GetFolderByUIDParams struct {
	// in:path
	// required:true
	FolderUID string `json:"folder_uid"`
}

// swagger:parameters updateFolder
type UpdateFolderParams struct {
	// in:path
	// required:true
	FolderUID string `json:"folder_uid"`
	// To change the unique identifier (uid), provide another one.
	// To overwrite an existing folder with newer version, set `overwrite` to `true`.
	// Provide the current version to safelly update the folder: if the provided version differs from the stored one the request will fail, unless `overwrite` is `true`.
	//
	// in:body
	// required:true
	Body models.UpdateFolderCommand `json:"body"`
}

// swagger:parameters getFolderByID
type GetFolderByIDParams struct {
	// in:path
	// required:true
	FolderID int64 `json:"folder_id"`
}

// swagger:parameters createFolder
type CreateFolderParams struct {
	// in:body
	// required:true
	Body models.CreateFolderCommand `json:"body"`
}

// swagger:parameters deleteFolder
type DeleteFolderParams struct {
	// in:path
	// required:true
	FolderUID string `json:"folder_uid"`
	// If `true` any Grafana 8 Alerts under this folder will be deleted.
	// Set to `false` so that the request will fail if the folder contains any Grafana 8 Alerts.
	// in:query
	// required:false
	// default:false
	ForceDeleteRules bool `json:"forceDeleteRules"`
}

// swagger:response getFoldersResponse
type GetFoldersResponse struct {
	// The response message
	// in: body
	Body []dtos.FolderSearchHit `json:"body"`
}

// swagger:response folderResponse
type FolderResponse struct {
	// The response message
	// in: body
	Body dtos.Folder `json:"body"`
}

// swagger:response deleteFolderResponse
type DeleteFolderResponse struct {
	// The response message
	// in: body
	Body struct {
		// ID Identifier of the deleted folder.
		// required: true
		// example: 65
		ID int64 `json:"id"`

		// Title of the deleted folder.
		// required: true
		// example: My Folder
		Title string `json:"title"`

		// Message Message of the deleted folder.
		// required: true
		// example: Folder My Folder deleted
		Message string `json:"message"`
	} `json:"body"`
}