package api

import (
	"net/http"
	"strconv"

	claims "github.com/grafana/authlib/types"
	"github.com/grafana/grafana/pkg/api/dtos"
	"github.com/grafana/grafana/pkg/api/response"
	"github.com/grafana/grafana/pkg/api/routing"
	"github.com/grafana/grafana/pkg/infra/log"
	"github.com/grafana/grafana/pkg/middleware/requestmeta"
	"github.com/grafana/grafana/pkg/services/accesscontrol"
	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
	"github.com/grafana/grafana/pkg/services/featuremgmt"
	"github.com/grafana/grafana/pkg/services/org"
	"github.com/grafana/grafana/pkg/services/serviceaccounts"
	"github.com/grafana/grafana/pkg/setting"
	"github.com/grafana/grafana/pkg/util"
	"github.com/grafana/grafana/pkg/web"
)

type ServiceAccountsAPI struct {
	cfg                  *setting.Cfg
	service              serviceaccounts.Service
	accesscontrol        accesscontrol.AccessControl
	accesscontrolService accesscontrol.Service
	RouterRegister       routing.RouteRegister
	log                  log.Logger
	permissionService    accesscontrol.ServiceAccountPermissionsService
	isExternalSAEnabled  bool
}

func NewServiceAccountsAPI(
	cfg *setting.Cfg,
	service serviceaccounts.Service,
	accesscontrol accesscontrol.AccessControl,
	accesscontrolService accesscontrol.Service,
	routerRegister routing.RouteRegister,
	permissionService accesscontrol.ServiceAccountPermissionsService,
	features featuremgmt.FeatureToggles,
) *ServiceAccountsAPI {
	enabled := features.IsEnabledGlobally(featuremgmt.FlagExternalServiceAccounts) && cfg.ManagedServiceAccountsEnabled
	return &ServiceAccountsAPI{
		cfg:                  cfg,
		service:              service,
		accesscontrol:        accesscontrol,
		accesscontrolService: accesscontrolService,
		RouterRegister:       routerRegister,
		log:                  log.New("serviceaccounts.api"),
		permissionService:    permissionService,
		isExternalSAEnabled:  enabled,
	}
}

func (api *ServiceAccountsAPI) RegisterAPIEndpoints() {
	auth := accesscontrol.Middleware(api.accesscontrol)
	saUIDResolver := serviceaccounts.MiddlewareServiceAccountUIDResolver(api.service, ":serviceAccountId")
	api.RouterRegister.Group("/api/serviceaccounts", func(serviceAccountsRoute routing.RouteRegister) {
		serviceAccountsRoute.Get("/search", auth(accesscontrol.EvalPermission(serviceaccounts.ActionRead)), routing.Wrap(api.SearchOrgServiceAccountsWithPaging))
		serviceAccountsRoute.Post("/", auth(accesscontrol.EvalPermission(serviceaccounts.ActionCreate)), routing.Wrap(api.CreateServiceAccount))
		serviceAccountsRoute.Get("/:serviceAccountId", saUIDResolver, auth(accesscontrol.EvalPermission(serviceaccounts.ActionRead, serviceaccounts.ScopeID)), routing.Wrap(api.RetrieveServiceAccount))
		serviceAccountsRoute.Patch("/:serviceAccountId", saUIDResolver, auth(accesscontrol.EvalPermission(serviceaccounts.ActionWrite, serviceaccounts.ScopeID)), routing.Wrap(api.UpdateServiceAccount))
		serviceAccountsRoute.Delete("/:serviceAccountId", saUIDResolver, auth(accesscontrol.EvalPermission(serviceaccounts.ActionDelete, serviceaccounts.ScopeID)), routing.Wrap(api.DeleteServiceAccount))
		serviceAccountsRoute.Get("/:serviceAccountId/tokens", saUIDResolver, auth(accesscontrol.EvalPermission(serviceaccounts.ActionRead, serviceaccounts.ScopeID)), routing.Wrap(api.ListTokens))
		serviceAccountsRoute.Post("/:serviceAccountId/tokens", saUIDResolver, auth(accesscontrol.EvalPermission(serviceaccounts.ActionWrite, serviceaccounts.ScopeID)), routing.Wrap(api.CreateToken))
		serviceAccountsRoute.Delete("/:serviceAccountId/tokens/:tokenId", saUIDResolver, auth(accesscontrol.EvalPermission(serviceaccounts.ActionWrite, serviceaccounts.ScopeID)), routing.Wrap(api.DeleteToken))
	}, requestmeta.SetOwner(requestmeta.TeamAuth))
}

// swagger:route POST /serviceaccounts service_accounts createServiceAccount
//
// # Create service account
//
// Required permissions (See note in the [introduction](https://grafana.com/docs/grafana/latest/developers/http_api/serviceaccount/#service-account-api) for an explanation):
// action: `serviceaccounts:write` scope: `serviceaccounts:*`
//
// Requires basic authentication and that the authenticated user is a Grafana Admin.
//
// Responses:
// 201: createServiceAccountResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 500: internalServerError
func (api *ServiceAccountsAPI) CreateServiceAccount(c *contextmodel.ReqContext) response.Response {
	cmd := serviceaccounts.CreateServiceAccountForm{}
	if err := web.Bind(c.Req, &cmd); err != nil {
		return response.Error(http.StatusBadRequest, "Bad request data", err)
	}

	if err := api.validateRole(cmd.Role, c.GetOrgRole()); err != nil {
		return response.ErrOrFallback(http.StatusInternalServerError, "failed to create service account", err)
	}

	serviceAccount, err := api.service.CreateServiceAccount(c.Req.Context(), c.GetOrgID(), &cmd)
	if err != nil {
		return response.ErrOrFallback(http.StatusInternalServerError, "Failed to create service account", err)
	}

	if api.cfg.RBAC.PermissionsOnCreation("service-account") {
		if c.IsIdentityType(claims.TypeUser) {
			// Clear permission cache for the user who's created the service account, so that new permissions are fetched for their next call
			// Required for cases when caller wants to immediately interact with the newly created object
			api.accesscontrolService.ClearUserPermissionCache(c.SignedInUser)
		}
	}

	return response.JSON(http.StatusCreated, serviceAccount)
}

// swagger:route GET /serviceaccounts/{serviceAccountId} service_accounts retrieveServiceAccount
//
// # Get single serviceaccount by Id
//
// Required permissions (See note in the [introduction](https://grafana.com/docs/grafana/latest/developers/http_api/serviceaccount/#service-account-api) for an explanation):
// action: `serviceaccounts:read` scope: `serviceaccounts:id:1` (single service account)
//
// Responses:
// 200: retrieveServiceAccountResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 500: internalServerError
func (api *ServiceAccountsAPI) RetrieveServiceAccount(ctx *contextmodel.ReqContext) response.Response {
	saID, err := strconv.ParseInt(web.Params(ctx.Req)[":serviceAccountId"], 10, 64)
	if err != nil {
		return response.Error(http.StatusBadRequest, "Service Account ID is invalid", err)
	}

	serviceAccount, err := api.service.RetrieveServiceAccount(ctx.Req.Context(), &serviceaccounts.GetServiceAccountQuery{
		OrgID: ctx.GetOrgID(),
		ID:    saID,
	})
	if err != nil {
		return response.ErrOrFallback(http.StatusInternalServerError, "Failed to retrieve service account", err)
	}

	saIDString := strconv.FormatInt(serviceAccount.Id, 10)
	metadata := api.getAccessControlMetadata(ctx, map[string]bool{saIDString: true})
	serviceAccount.AvatarUrl = dtos.GetGravatarUrlWithDefault(api.cfg, "", serviceAccount.Name)
	serviceAccount.AccessControl = metadata[saIDString]

	tokens, err := api.service.ListTokens(ctx.Req.Context(), &serviceaccounts.GetSATokensQuery{
		OrgID:            &serviceAccount.OrgId,
		ServiceAccountID: &serviceAccount.Id,
	})
	if err != nil {
		api.log.Warn("Failed to list tokens for service account", "serviceAccount", serviceAccount.Id)
	}
	serviceAccount.Tokens = int64(len(tokens))

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

// swagger:route PATCH /serviceaccounts/{serviceAccountId} service_accounts updateServiceAccount
//
// # Update service account
//
// Required permissions (See note in the [introduction](https://grafana.com/docs/grafana/latest/developers/http_api/serviceaccount/#service-account-api) for an explanation):
// action: `serviceaccounts:write` scope: `serviceaccounts:id:1` (single service account)
//
// Responses:
// 200: updateServiceAccountResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 500: internalServerError
func (api *ServiceAccountsAPI) UpdateServiceAccount(c *contextmodel.ReqContext) response.Response {
	saID, err := strconv.ParseInt(web.Params(c.Req)[":serviceAccountId"], 10, 64)
	if err != nil {
		return response.Error(http.StatusBadRequest, "Service Account ID is invalid", err)
	}

	cmd := serviceaccounts.UpdateServiceAccountForm{}
	if err := web.Bind(c.Req, &cmd); err != nil {
		return response.Error(http.StatusBadRequest, "Bad request data", err)
	}

	if err := api.validateRole(cmd.Role, c.GetOrgRole()); err != nil {
		return response.ErrOrFallback(http.StatusInternalServerError, "failed to update service account", err)
	}

	resp, err := api.service.UpdateServiceAccount(c.Req.Context(), c.GetOrgID(), saID, &cmd)
	if err != nil {
		return response.ErrOrFallback(http.StatusInternalServerError, "Failed update service account", err)
	}

	saIDString := strconv.FormatInt(resp.Id, 10)
	metadata := api.getAccessControlMetadata(c, map[string]bool{saIDString: true})
	resp.AvatarUrl = dtos.GetGravatarUrlWithDefault(api.cfg, "", resp.Name)
	resp.AccessControl = metadata[saIDString]

	return response.JSON(http.StatusOK, util.DynMap{
		"message":        "Service account updated",
		"id":             resp.Id,
		"name":           resp.Name,
		"serviceaccount": resp,
	})
}

func (api *ServiceAccountsAPI) validateRole(r *org.RoleType, orgRole org.RoleType) error {
	if r != nil && !r.IsValid() {
		return serviceaccounts.ErrServiceAccountInvalidRole.Errorf("invalid role specified")
	}
	if r != nil && !orgRole.Includes(*r) {
		return serviceaccounts.ErrServiceAccountRolePrivilegeDenied.Errorf("can not assign a role higher than user's role")
	}
	return nil
}

// swagger:route DELETE /serviceaccounts/{serviceAccountId} service_accounts deleteServiceAccount
//
// # Delete service account
//
// Required permissions (See note in the [introduction](https://grafana.com/docs/grafana/latest/developers/http_api/serviceaccount/#service-account-api) for an explanation):
// action: `serviceaccounts:delete` scope: `serviceaccounts:id:1` (single service account)
//
// Responses:
// 200: okResponse
// 400: badRequestError
// 401: unauthorisedError
// 403: forbiddenError
// 404: notFoundError
// 500: internalServerError
func (api *ServiceAccountsAPI) DeleteServiceAccount(ctx *contextmodel.ReqContext) response.Response {
	saID, err := strconv.ParseInt(web.Params(ctx.Req)[":serviceAccountId"], 10, 64)
	if err != nil {
		return response.Error(http.StatusBadRequest, "Service account ID is invalid", err)
	}
	err = api.service.DeleteServiceAccount(ctx.Req.Context(), ctx.GetOrgID(), saID)
	if err != nil {
		return response.ErrOrFallback(http.StatusInternalServerError, "Service account deletion error", err)
	}
	return response.Success("Service account deleted")
}

// swagger:route GET /serviceaccounts/search service_accounts searchOrgServiceAccountsWithPaging
//
// # Search service accounts with paging
//
// Required permissions (See note in the [introduction](https://grafana.com/docs/grafana/latest/developers/http_api/serviceaccount/#service-account-api) for an explanation):
// action: `serviceaccounts:read` scope: `serviceaccounts:*`
//
// Responses:
// 200: searchOrgServiceAccountsWithPagingResponse
// 401: unauthorisedError
// 403: forbiddenError
// 500: internalServerError
func (api *ServiceAccountsAPI) SearchOrgServiceAccountsWithPaging(c *contextmodel.ReqContext) response.Response {
	ctx := c.Req.Context()
	perPage := c.QueryInt("perpage")
	if perPage <= 0 {
		perPage = 1000
	}
	page := c.QueryInt("page")
	if page < 1 {
		page = 1
	}
	// its okay that it fails, it is only filtering that might be weird, but to safe quard against any weird incoming query param
	onlyWithExpiredTokens := c.QueryBool("expiredTokens")
	onlyDisabled := c.QueryBool("disabled")
	onlyExternal := c.QueryBool("external")
	filter := serviceaccounts.FilterIncludeAll
	if onlyWithExpiredTokens {
		filter = serviceaccounts.FilterOnlyExpiredTokens
	}
	if api.isExternalSAEnabled && onlyExternal {
		filter = serviceaccounts.FilterOnlyExternal
	}
	if onlyDisabled {
		filter = serviceaccounts.FilterOnlyDisabled
	}
	q := serviceaccounts.SearchOrgServiceAccountsQuery{
		OrgID:        c.GetOrgID(),
		Query:        c.Query("query"),
		Page:         page,
		Limit:        perPage,
		Filter:       filter,
		SignedInUser: c.SignedInUser,
		CountTokens:  true,
	}
	serviceAccountSearch, err := api.service.SearchOrgServiceAccounts(ctx, &q)
	if err != nil {
		return response.Error(http.StatusInternalServerError, "Failed to get service accounts for current organization", err)
	}

	saIDs := map[string]bool{}
	for i := range serviceAccountSearch.ServiceAccounts {
		sa := serviceAccountSearch.ServiceAccounts[i]
		sa.AvatarUrl = dtos.GetGravatarUrlWithDefault(api.cfg, "", sa.Name)

		saIDString := strconv.FormatInt(sa.Id, 10)
		saIDs[saIDString] = true
		metadata := api.getAccessControlMetadata(c, map[string]bool{saIDString: true})
		sa.AccessControl = metadata[strconv.FormatInt(sa.Id, 10)]
	}

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

func (api *ServiceAccountsAPI) getAccessControlMetadata(c *contextmodel.ReqContext, saIDs map[string]bool) map[string]accesscontrol.Metadata {
	if !c.QueryBool("accesscontrol") {
		return map[string]accesscontrol.Metadata{}
	}

	if len(c.GetPermissions()) == 0 {
		return map[string]accesscontrol.Metadata{}
	}

	permissions := c.GetPermissions()
	return accesscontrol.GetResourcesMetadata(c.Req.Context(), permissions, "serviceaccounts:id:", saIDs)
}

// swagger:parameters searchOrgServiceAccountsWithPaging
type SearchOrgServiceAccountsWithPagingParams struct {
	// in:query
	// required:false
	Disabled bool `jsson:"disabled"`
	// in:query
	// required:false
	ExpiredTokens bool `json:"expiredTokens"`
	// It will return results where the query value is contained in one of the name.
	// Query values with spaces need to be URL encoded.
	// in:query
	// required:false
	Query string `json:"query"`
	// The default value is 1000.
	// in:query
	// required:false
	PerPage int `json:"perpage"`
	// The default value is 1.
	// in:query
	// required:false
	Page int `json:"page"`
}

// swagger:parameters createServiceAccount
type CreateServiceAccountParams struct {
	//in:body
	Body serviceaccounts.CreateServiceAccountForm
}

// swagger:parameters retrieveServiceAccount
type RetrieveServiceAccountParams struct {
	// in:path
	ServiceAccountId int64 `json:"serviceAccountId"`
}

// swagger:parameters updateServiceAccount
type UpdateServiceAccountParams struct {
	// in:path
	ServiceAccountId int64 `json:"serviceAccountId"`
	// in:body
	Body serviceaccounts.UpdateServiceAccountForm
}

// swagger:parameters deleteServiceAccount
type DeleteServiceAccountParams struct {
	// in:path
	ServiceAccountId int64 `json:"serviceAccountId"`
}

// swagger:response searchOrgServiceAccountsWithPagingResponse
type SearchOrgServiceAccountsWithPagingResponse struct {
	// in:body
	Body *serviceaccounts.SearchOrgServiceAccountsResult
}

// swagger:response createServiceAccountResponse
type CreateServiceAccountResponse struct {
	// in:body
	Body *serviceaccounts.ServiceAccountDTO
}

// swagger:response retrieveServiceAccountResponse
type RetrieveServiceAccountResponse struct {
	// in:body
	Body *serviceaccounts.ServiceAccountDTO
}

// swagger:response updateServiceAccountResponse
type UpdateServiceAccountResponse struct {
	// in:body
	Body struct {
		Message        string                                    `json:"message"`
		ID             int64                                     `json:"id"`
		Name           string                                    `json:"name"`
		ServiceAccount *serviceaccounts.ServiceAccountProfileDTO `json:"serviceaccount"`
	}
}