package coderd

import (
	"context"
	"net/http"

	"github.com/google/uuid"

	"github.com/coder/coder/v2/coderd/database"
	"github.com/coder/coder/v2/coderd/database/db2sdk"
	"github.com/coder/coder/v2/coderd/httpmw"
	"github.com/coder/coder/v2/coderd/rbac/policy"
	"github.com/coder/coder/v2/codersdk"

	"github.com/coder/coder/v2/coderd/httpapi"
	"github.com/coder/coder/v2/coderd/rbac"
)

// CustomRoleHandler handles AGPL/Enterprise interface for handling custom
// roles. Ideally only included in the enterprise package, but the routes are
// intermixed with AGPL endpoints.
type CustomRoleHandler interface {
	PatchOrganizationRole(ctx context.Context, rw http.ResponseWriter, r *http.Request, orgID uuid.UUID, role codersdk.Role) (codersdk.Role, bool)
}

type agplCustomRoleHandler struct{}

func (agplCustomRoleHandler) PatchOrganizationRole(ctx context.Context, rw http.ResponseWriter, _ *http.Request, _ uuid.UUID, _ codersdk.Role) (codersdk.Role, bool) {
	httpapi.Write(ctx, rw, http.StatusForbidden, codersdk.Response{
		Message: "Creating and updating custom roles is an Enterprise feature. Contact sales!",
	})
	return codersdk.Role{}, false
}

// patchRole will allow creating a custom organization role
//
// @Summary Upsert a custom organization role
// @ID upsert-a-custom-organization-role
// @Security CoderSessionToken
// @Produce json
// @Param organization path string true "Organization ID" format(uuid)
// @Tags Members
// @Success 200 {array} codersdk.Role
// @Router /organizations/{organization}/members/roles [patch]
func (api *API) patchOrgRoles(rw http.ResponseWriter, r *http.Request) {
	var (
		ctx          = r.Context()
		handler      = *api.CustomRoleHandler.Load()
		organization = httpmw.OrganizationParam(r)
	)

	var req codersdk.Role
	if !httpapi.Read(ctx, rw, r, &req) {
		return
	}

	updated, ok := handler.PatchOrganizationRole(ctx, rw, r, organization.ID, req)
	if !ok {
		return
	}

	httpapi.Write(ctx, rw, http.StatusOK, updated)
}

// AssignableSiteRoles returns all site wide roles that can be assigned.
//
// @Summary Get site member roles
// @ID get-site-member-roles
// @Security CoderSessionToken
// @Produce json
// @Tags Members
// @Success 200 {array} codersdk.AssignableRoles
// @Router /users/roles [get]
func (api *API) AssignableSiteRoles(rw http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	actorRoles := httpmw.UserAuthorization(r)
	if !api.Authorize(r, policy.ActionRead, rbac.ResourceAssignRole) {
		httpapi.Forbidden(rw)
		return
	}

	dbCustomRoles, err := api.Database.CustomRoles(ctx, database.CustomRolesParams{
		LookupRoles: nil,
		// Only site wide custom roles to be included
		ExcludeOrgRoles: true,
		OrganizationID:  uuid.Nil,
	})
	if err != nil {
		httpapi.InternalServerError(rw, err)
		return
	}

	httpapi.Write(ctx, rw, http.StatusOK, assignableRoles(actorRoles.Roles, rbac.SiteRoles(), dbCustomRoles))
}

// assignableOrgRoles returns all org wide roles that can be assigned.
//
// @Summary Get member roles by organization
// @ID get-member-roles-by-organization
// @Security CoderSessionToken
// @Produce json
// @Tags Members
// @Param organization path string true "Organization ID" format(uuid)
// @Success 200 {array} codersdk.AssignableRoles
// @Router /organizations/{organization}/members/roles [get]
func (api *API) assignableOrgRoles(rw http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	organization := httpmw.OrganizationParam(r)
	actorRoles := httpmw.UserAuthorization(r)

	if !api.Authorize(r, policy.ActionRead, rbac.ResourceAssignOrgRole.InOrg(organization.ID)) {
		httpapi.ResourceNotFound(rw)
		return
	}

	roles := rbac.OrganizationRoles(organization.ID)
	dbCustomRoles, err := api.Database.CustomRoles(ctx, database.CustomRolesParams{
		LookupRoles:     nil,
		ExcludeOrgRoles: false,
		OrganizationID:  organization.ID,
	})
	if err != nil {
		httpapi.InternalServerError(rw, err)
		return
	}

	httpapi.Write(ctx, rw, http.StatusOK, assignableRoles(actorRoles.Roles, roles, dbCustomRoles))
}

func assignableRoles(actorRoles rbac.ExpandableRoles, roles []rbac.Role, customRoles []database.CustomRole) []codersdk.AssignableRoles {
	assignable := make([]codersdk.AssignableRoles, 0)
	for _, role := range roles {
		// The member role is implied, and not assignable.
		// If there is no display name, then the role is also unassigned.
		// This is not the ideal logic, but works for now.
		if role.Identifier == rbac.RoleMember() || (role.DisplayName == "") {
			continue
		}
		assignable = append(assignable, codersdk.AssignableRoles{
			Role:       db2sdk.RBACRole(role),
			Assignable: rbac.CanAssignRole(actorRoles, role.Identifier),
			BuiltIn:    true,
		})
	}

	for _, role := range customRoles {
		assignable = append(assignable, codersdk.AssignableRoles{
			Role:       db2sdk.Role(role),
			Assignable: rbac.CanAssignRole(actorRoles, role.RoleIdentifier()),
			BuiltIn:    false,
		})
	}
	return assignable
}